CN102651613A - System and method used for constant-voltage mode and constant-current mode in flyback supply convertor - Google Patents

System and method used for constant-voltage mode and constant-current mode in flyback supply convertor Download PDF

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CN102651613A
CN102651613A CN2011100514232A CN201110051423A CN102651613A CN 102651613 A CN102651613 A CN 102651613A CN 2011100514232 A CN2011100514232 A CN 2011100514232A CN 201110051423 A CN201110051423 A CN 201110051423A CN 102651613 A CN102651613 A CN 102651613A
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signal
output
receive
information
sensing
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CN102651613B (en
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张允超
曹亚明
黄晓敏
张秀红
方烈义
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On Bright Electronics Shanghai Co Ltd
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Abstract

The invention discloses a system and a method used for a constant-voltage mode and a constant-current mode in a flyback supply convertor. The system comprises a first signal generator which is configured for receiving a first sensing signal and generating an output signal related to demagnetization, the first sensing signal is related to a first winding coupled to a secondary winding of the supply convertor, and the secondary winding is at least related to the output current of the supply convertor; in addition, the system comprises a ramp signal generator which is configured for receiving the output signal and generating a ramp signal and a first comparator which is configured for receiving the ramp signal and a first threshold signal and generating a first comparison signal at least based on information related to the ramp signal and the first threshold signal; and furthermore, the system comprises a second comparator which is configured for receiving a second sensing signal and a second threshold signal and generating a second comparison signal.

Description

Be used for the constant voltage of flyback power supply converter and the system and method for constant current mode
Technical field
The present invention relates to integrated circuit.More specifically, the invention provides the system and method that is used for constant voltage mode and constant current mode.As just example, the present invention has been applied to having the flyback power supply converter of primary side sensing (sensing) and adjustment (regulation).But will recognize that the present invention has much wide range of application.
Background technology
The flyback power supply converter is widely used in the low power applications because of its simple structure and low cost.But in the classical inverse excitation type converter, utilize the isolation of photoelectrical coupler and TL431 to arrange usually to feed back and carry out the output voltage adjustment through primary side.Except increasing system cost, the voltage drop that causes owing to cable loss normally is difficult to compensate.
Fig. 1 is the simplification tradition diagrammatic sketch that is used to have the switching mode flyback power supply transformation system of primary side control.As shown in Figure 1, PWM controller 110 is used for controlling and driving power MOSFETM1.Make power supply MOSFET M1 conducting and end and control the power of sending to the load on the primary side.Therefore, constant output voltage (CV) pattern and constant output electric current (CC) pattern can be obtained through the primary side adjustment.
Fig. 2 illustrates the output voltage of flyback power supply transformation system and the simplification tradition diagrammatic sketch of output current characteristic.As shown in Figure 2, if output current I oFrom zero to I Max, scope in, then system operates in constant voltage (CV) pattern.In the CV pattern, output voltage V oFor example equal V MaxAlternatively, if output voltage at V MaxBelow, then system operates in constant current (CC) pattern.In the CC pattern, output current I oFor example equal I Max.In another example, if the lead-out terminal of system is connected to through discharge battery, then system operates in the CC pattern.
For the cost that reduces switching mode flyback power supply converter with size and also in order to improve its efficient, the supply convertor with primary side adjustment has become and has become more and more popular.In primary side adjustment, come the sensing output voltage to the voltage of the auxiliary winding of secondary winding through detecting close-coupled.Because the voltage of auxiliary winding reflects the output voltage that (image) is associated with secondary winding, the voltage that therefore in auxiliary winding, senses can be used to adjust the primary side output voltage.Usually do not need the expensive part in TL431 and the photoelectrical coupler, therefore can reduce cost and size.In addition, utilize the information of the output voltage that senses, can adjust output current based on the internal calculation of controller.Therefore, need not be used for the sense resistor of output current usually, therefore can improve overall conversion efficiency.
Fig. 3 is the simplification tradition diagrammatic sketch with switching mode flyback power supply transformation system of primary side sensing and modulation.Fig. 4 is that another of switching mode flyback power supply transformation system with primary side sensing and modulation simplified traditional diagrammatic sketch.
As shown in the figure, output voltage V OutBe mapped to the dc voltage V at node INV place INV, therefore pass through V INVAdjustment and by being adjusted.In the primary side adjustment, V INVAnd V OutRelation can be expressed as:
V INV = n × R 2 R 1 + R 2 × ( V out + V D 2 ) - R 2 R 1 + R 2 × V D 1 - - - ( 1 )
Wherein, n is auxiliary umber of turn and the ratio of the secondary winding number of turn.In addition, V D1And V D2It is the forward direction diode drop.
Be provided with Therefore, V OutProvide by following formula:
V out = k × V INV + 1 n V D 1 - V D 2 - - - ( 2 )
Output voltage is through being adjusted the adjustment of the voltage of auxiliary winding.For example, the voltage V that senses INVQuilt and predetermined voltage level V REFCompare.V INVWith V REFDifference be associated this V with error signal INVWith V REFDifference amplified by error amplifier.Based on the error signal through amplifying, the PWM/PFM signal is generated at least in part.
The on/off of PWM/PFM signal control power supply switch, therefore the power to primary side is sent in control.As a result, V INVWith V REFDifference become more and more littler, and final, V INVBecome and equal V REFBecause V INVIt is output voltage V OutReflection, therefore if some condition is met, output voltage V then OutCan depend on V linearly INV, therefore depend on V REF
Particularly, as follows, if the forward voltage at diode D1 and D2 two ends is constant, output voltage V then OutDepend on V linearly REF
V out = k × V REF + 1 n V D 1 - V D 2 - - - ( 3 )
Yet the forward voltage of diode depends on the electric current of this diode of flowing through usually.Therefore, if load current changes, then the forward voltage of D2 changes.Even the electric current of D1 is also constant when output load current changes owing to flow through, so the forward voltage of D1 is always constant.
Fig. 5 is the traditional diagrammatic sketch of another simplification with switching mode flyback power supply transformation system of primary side sensing and modulation.Power converting system 2000 comprises elementary winding 2010, secondary winding 2012, auxiliary winding 2014, mains switch 2020, current-sense resistor 2030, the equivalent resistor 2040 of output cable, resistor 2050 and 2052, and rectifier diode 2060 and 2062.For example, mains switch 2020 is npn bipolar transistors.In another example, mains switch 2020 is mosfet transistors.In another example, mains switch 2020 is igbt transistors.
As shown in Figure 5, in order in preset range, to adjust output voltage, the information relevant with output voltage and output loading need be extracted out usually.In interrupted conduction mode (DCM), such information can be extracted through auxiliary winding 2014.When mains switch 2020 conductings, energy is stored in the secondary winding 2012.Then, when mains switch 2020 ended, institute's stored energy was released to lead-out terminal, and the output voltage on the voltage of the auxiliary winding 2014 mapping primary side, and is as follows.
V FB = 1 k × ( V o + V D 2 + I o × R eq ) - V D 1 k × n - - - ( 4 )
Wherein, V FBThe voltage at expression node 2054 places.R 1And R 2The resistance value of representing resistor 2050 and 2052 respectively.In addition, n representes the turn ratio between auxiliary winding 2014 and the secondary winding 2012.Particularly, n equals the number of turn of the number of turn of auxiliary winding 2014 divided by secondary winding 2012.V oAnd I oRepresent output voltage and output current respectively.In addition, respectively, V D1The forward voltage of expression rectifier diode 2062, V D2The forward voltage of expression rectifier diode 2060.In addition, R EqThe resistance value of expression equivalent resistor 2040, and k representes to equal
Figure BSA00000443883900033
Feedback factor.
Fig. 6 is the simplification diagrammatic sketch that the traditional operation mechanism of flyback power supply transformation system 2000 is shown.As shown in Figure 6, the controller chip of transformation system 2000 uses sampling to keep mechanism.The electric current I of almost completion and secondary winding 2012 is handled in demagnetization on the primary side SecAlmost during vanishing, the voltage V at node 2054 places FB(the V of itself and auxiliary winding 2012 AuxProportional) for example sampled at the some A place of Fig. 6.The magnitude of voltage that sampling obtains is held usually till next voltage sample is performed.Through negative feedback loop, sample voltage value can become and equal reference voltage V REFTherefore,
V FB＝V REF (5)
Combination equality 4 and 5 can obtain following formula:
V o = k × V REF + 1 n V D 1 - V D 2 - I o × R eq - - - ( 6 )
Based on equality 6, output voltage reduces along with the increase of output current.In addition, aforesaid controlling schemes is usually because the change of the forward voltage of diode D2 and output voltage is had relatively poor adjustment.
In addition, if power converting system 2000 operation in interrupted conduction mode (DCM), then output current also can be adjusted, so that obtain the constant output electric current.As shown in Figure 6, output current equals the electric current I of secondary winding 2012 in each switch periods SecMean value, as follows:
I o = 1 2 × I sec _ pk × T Demag T s - - - ( 7 )
Therefore, I o = 1 2 × N × 1 T × ∫ 0 T V Cs _ Pk R s × T Demag T s Dt - - - ( 8 )
Wherein, N representes the turn ratio between elementary winding 2010 and the secondary winding 2012.Particularly, N equals the number of turn of the number of turn of elementary winding 2010 divided by secondary winding 2012.In addition, T representes integration period, and T sExpression equals the switch periods of inverse of the switching frequency of power converting system 2000.For example, T is equal to or greater than T sIn addition, R sThe resistance value of expression current-sense resistor 2030.And, V Cs_pkThe voltage V that expression current-sense resistor 2030 senses in each switch periods CsPeak value, and T DemagThe duration in each switch periods is handled in the expression demagnetization.According to certain conventional art, output current can depend on the inductance of elementary winding; Therefore, output current stands big variation usually, and it can not be compensated in production in enormous quantities usually effectively.
Therefore, hope very much to improve the technology that is used for output voltage adjustment and output current control, for example, hope very much to carry out elementary winding inductance compensation.
Summary of the invention
The present invention relates to integrated circuit.More specifically, the invention provides the system and method that is used for constant voltage mode and constant current mode.As just example, the present invention has been applied to having the flyback power supply converter of primary side sensing and adjustment.But will recognize that the present invention has much wide range of application.
According to an embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, be configured to receiving inputted signal at least and generate the first output signal that is associated with demagnetization at least and be associated with sampling second export signal.In addition; This system comprises sampling component; Be configured at least the receiving inputted signal and the second output signal, come sampled input signal based on the information that joins with the second output signal correction at least, and generate at least with one or more and the 3rd export signals through what sample size was associated.In addition, this system comprises error amplifier, is configured to receive at least the 3rd output signal and first threshold voltage and generates the 4th output signal at least through capacitor, and this capacitor is coupled to this error amplifier.In addition, this system comprises compensation assembly, is configured to receive at least the 4th output signal and generates compensating signal at least.Input signal is the combination of the compensating signal and first sensing signal.First sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and secondary winding is associated with the output current and the output voltage of this supply convertor.In addition, this system comprises first controller that is used for adjusting at least output current.For example, first controller is configured to receive at least the first output signal and the 3rd output signal, and at least based on coming to generate at least first control signal with the information of the first output signal and the 3rd output signal correction couplet.In addition, this system comprises second controller that is used for adjusting at least output voltage.For example, second controller is configured to receive at least the 4th output signal and comes to generate at least second control signal and the 3rd control signal based on the information that joins with the 4th output signal correction at least.In addition; This system comprises oscillator; Be configured to receive at least first control signal and second control signal and generate clock signal at least, and the secondary signal maker, be configured at least receive clock signal, the 3rd control signal and the 4th control signal and generate modulation signal at least.In addition, this system comprises gate driver, is configured to receive at least modulation signal and exports to switch to major general's drive signal.For example, this switch is configured to influence first electric current of the elementary winding that is coupled to secondary winding of flowing through.In addition, this system comprises the 3rd controller, is used for adjusting at least peak current.For example, the 3rd controller is configured to receive the 3rd control signal, second sensing signal and second threshold voltage, and the 4th control signal is exported to the secondary signal maker.In another example, second sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises sampling component, is configured to receiving inputted signal at least, sampled input signal, and generate at least with one or more and first export signals through what sample size was associated.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition, this system comprises error amplifier, is configured to receive at least the first output signal and threshold voltage and generates the second output signal through capacitor, and generate the 3rd output signal, and this capacitor is coupled to this error amplifier.In addition, this system comprises the feed forward assembly, is configured to receive the 3rd output signal, and generates the 4th output signal based on the information with the 3rd output signal correction couplet at least; And controller, be used for adjusting at least output voltage.For example, controller is configured to receive at least the second output signal and the 4th output signal, and generates first control signal at least.In addition, this system comprises signal generator, is configured to receive at least first control signal and comes to generate at least modulation signal based on the information that is associated with first control signal at least; And gate driver, be configured to receive at least modulation signal and export to switch to major general's drive signal.For example, this switch is configured to influence first electric current of the elementary winding that is coupled to secondary winding of flowing through.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises sampling component, is configured to receiving inputted signal at least, sampled input signal, and generate at least with one or more and first export signals through what sample size was associated; And error amplifier, being configured to receive at least the first output signal and threshold voltage and generating the second output signal, and generate the 3rd output signal through capacitor, this capacitor is coupled to this error amplifier.In addition, this system comprises the feed forward assembly, is configured to receive the 3rd output signal, and generates the 4th output signal based on the information with the 3rd output signal correction couplet at least; And controller, be configured to receive at least the second output signal and the 4th output signal, and generate control signal at least.In addition, this system comprises compensation assembly, is configured to receive at least the second output signal and comes to generate at least compensating signal based on the information that joins with the second output signal correction at least, and input signal is the combination of compensating signal and another signal.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, be configured to receiving inputted signal at least and generate the first output signal that is associated with demagnetization at least and be associated with sampling second export signal.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition; This system comprises sampling component; Be configured at least the receiving inputted signal and the second output signal, come sampled input signal based on the information that joins with the second output signal correction at least, and generate at least with one or more and the 3rd export signals through what sample size was associated.In addition; This system comprises first controller; Be used for adjusting at least output current, this first controller is configured to receive at least the first output signal and the 3rd output signal, and at least based on coming to generate at least first control signal with the information of the first output signal and the 3rd output signal correction couplet.In addition, this system comprises oscillator, is configured to receive at least first control signal and comes to generate at least clock signal based on the information that is associated with first control signal at least; And the secondary signal maker, be configured to the receive clock signal and second control signal at least, and come to generate at least modulation signal based on the information that is associated with the clock signal and second control signal at least.In addition, this system comprises gate driver, is configured to receive at least modulation signal and exports to switch to major general's drive signal.For example, switch is configured to influence first electric current of the elementary winding that is coupled to secondary winding of flowing through.In addition, this system comprises the 3rd controller that is used for adjusting at least peak current, is configured to receive at least sensing signal and threshold voltage, and second control signal is exported to the secondary signal maker.For example, sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.Modulation signal is corresponding to switching frequency, and the first output signal is corresponding to the demagnetization pulse duration.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises the controller that is used for adjusting at least peak current.For example, controller is configured to receive at least sensing signal and first threshold signal and generates first control signal at least, and sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.In addition, this system comprises signal generator, is configured to receive at least first control signal and generates modulation signal at least; And gate driver, be configured to receive at least modulation signal and export to switch to major general's drive signal.For example, this switch is configured to influence first electric current.In another example, this controller comprises first comparator, is configured to receive sensing signal and first threshold voltage, and generates comparison signal based on the information that is associated with sensing signal and first threshold voltage at least; And charge pump, be configured to receive comparison signal and generate the 3rd control signal based on the information that is associated with comparison signal at least.In addition, this controller comprises the threshold value maker, is configured to receive second control signal and generates second threshold voltage based on the information that is associated with second control signal at least; And second comparator, be configured to receive second threshold voltage and sensing signal, and generate first control signal based on the information that is associated with second threshold voltage and sensing signal at least.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises by first signal generator receiving inputted signal and come to generate at least based on the information that is associated with input signal at least and demagnetize first output signal that is associated and the second output signal that is associated with sampling at least.In addition; This method comprises through sampling component comes the receiving inputted signal and the second output signal at least; At least come sampled input signal based on the information that joins with the second output signal correction, and generate at least with one or more and the 3rd export signals through what sample size was associated; Come to receive at least the 3rd output signal and first threshold voltage and generate the 4th at least through capacitor to export signal through error amplifier, this capacitor is coupled to this error amplifier.In addition, this method comprises through compensation assembly to receive at least the 4th output signal and coming to generate at least compensating signal based on the information that joins with the 4th output signal correction at least.For example, input signal is the combination of the compensating signal and first sensing signal.In another example, first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and secondary winding is associated with the output current and the output voltage of this supply convertor.In addition; This method comprises through first controller that is used for adjusting at least output current to receive at least the first output signal and the 3rd output signal, and comes to generate at least first control signal based on the information that joins with the first output signal and the 3rd output signal correction at least; Come to receive at least the 4th output signal and come to generate at least second control signal and the 3rd control signal based on the information that joins with the 4th output signal correction at least through second controller that is used for adjusting at least output voltage.In addition, this method comprises through oscillator to receive at least first control signal and second control signal and generating clock signal at least through this oscillator; Come at least receive clock signal, the 3rd control signal and the 4th control signal and generate modulation signal at least through the secondary signal maker through this secondary signal maker.In addition, this method comprises through gate driver to receive at least modulation signal and exporting to switch with flow through first electric current of the elementary winding that is coupled to secondary winding of influence to major general's drive signal; The 3rd controller through being used for adjusting at least peak current receives the 3rd control signal, second sensing signal and second threshold voltage, and the 4th control signal is exported to the secondary signal maker.For example, second sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises through sampling component comes receiving inputted signal at least.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition, this method comprises through sampling component samples to input signal, generates at least and one or more first output signals that are associated through sample size; Come to receive at least first output signal and the threshold voltage and generate second through capacitor to export signal through error amplifier, this capacitor is coupled to this error amplifier.In addition, this method comprises that generating the 3rd through error amplifier exports signal; Receive the 3rd output signal through the feed forward assembly, and generate the 4th output signal based on information at least with the 3rd output signal correction couplet; Come to receive at least the second output signal and the 4th output signal through the controller that is used for adjusting at least output voltage, and come to generate at least first control signal based on the information that joins with the second output signal and the 4th output signal correction at least.In addition, this method comprises through signal generator to receive at least first control signal and coming to generate at least modulation signal based on the information that is associated with first control signal at least; Come to receive at least modulation signal and export to first electric current that switch influences the elementary winding that is coupled to secondary winding of flowing through to major general's drive signal through gate driver.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises through sampling component comes receiving inputted signal at least, by this sampling component sampled input signal, and generates at least with one or more and first exports signals through what sample size was associated.In addition; This method comprises through error amplifier to receive at least the first output signal with threshold voltage and come to export signal through capacitor generation second based on the information that is associated with the first output signal and threshold voltage at least; And generate the 3rd output signal based on the information that is associated with the first output signal and threshold voltage at least, this capacitor is coupled to this error amplifier.In addition, this method comprises that receiving the 3rd through the feed forward assembly exports signal, and generates the 4th output signal based on the information with the 3rd output signal correction couplet at least; Come to receive at least the second output signal and the 4th output signal through controller, and at least based on coming to generate at least control signal with the information of the second output signal and the 4th output signal correction couplet.In addition, this method comprises through compensation assembly to receive at least the second output signal and coming to generate at least compensating signal based on the information that joins with the second output signal correction at least, and input signal is the combination of compensating signal and another signal.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises through first signal generator comes receiving inputted signal at least.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition, this method comprises at least to generate at least and first output signal that is associated and the second output signal that is associated with sampling of demagnetizing based on the information that is associated with input signal; Come at least the receiving inputted signal and the second output signal through sampling component, come sampled input signal based on the information that joins with the second output signal correction at least, and generate at least with one or more and the 3rd export signals through what sample size was associated.In addition; This method comprises through first controller that is used for adjusting at least output current to receive at least the first output signal and the 3rd output signal, and comes to generate at least first control signal based on the information that joins with the first output signal and the 3rd output signal correction at least; Come to receive at least first control signal and come to generate at least clock signal based on the information that is associated with first control signal at least through oscillator.In addition, this method comprises through the secondary signal maker comes the receive clock signal and second control signal at least, and comes to generate at least modulation signal based on the information that is associated with the clock signal and second control signal at least; Come to receive at least modulation signal and export to switch with flow through first electric current of the elementary winding that is coupled to secondary winding of influence to major general's drive signal through gate driver.In addition, this method comprises that the 3rd controller through being used for adjusting at least peak current to receive at least sensing signal and threshold voltage, and second control signal is exported to the secondary signal maker.Sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through, and modulation signal is corresponding to switching frequency, and the first output signal is corresponding to the demagnetization pulse duration.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises that the controller through being used for adjusting at least peak current to receive at least sensing signal and first threshold signal.For example, sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.In addition, this method comprises at least and comes to generate at least first control signal based on the information that is associated with sensing signal and first threshold voltage; Come to receive at least first control signal and come to generate at least modulation signal based on the information that is associated with first control signal at least through signal generator; Come to receive at least modulation signal and export to switch to influence first electric current to major general's drive signal through gate driver.The processing that is used for generating at least first control signal comprises through first comparator and receives sensing signal and first threshold voltage, and generates comparison signal based on the information that is associated with sensing signal and first threshold voltage at least; Receive comparison signal and generate second control signal based on the information that is associated with comparison signal at least through charge pump; The passing threshold maker receives second control signal and generates second threshold voltage based on the information that is associated with second control signal at least; Receive second threshold voltage and sensing signal through second comparator, and generate first control signal based on the information that is associated with second threshold voltage and sensing signal at least.
Compare with conventional art, obtained many benefits through the present invention.Some embodiment of the present invention can reduce the part counting and/or reduce system cost.Some embodiments of the present invention can improve reliability and/or efficient.Some embodiment of the present invention can simplify the circuit design in the switching mode flyback power supply converter.Some embodiments of the present invention provide primary side sensing and adjustment scheme.For example, primary side sensing and adjustment scheme can be improved the load adjustment.In another example, primary side sensing and adjustment scheme can compensate elementary winding inductance variation so that in the inverse excitation type converter that adopts the primary side adjustment, obtain constant output current.Some embodiment of the present invention can provide the constant output electric current that does not change along with the change of elementary winding inductance in the CC pattern.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises: first signal generator is configured to receive first sensing signal and generates and the output signal that demagnetizes and be associated.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this system comprises the ramp signal maker, is configured to receive said output signal and generates ramp signal; And first comparator, be configured to receive said ramp signal and first threshold signal, and generate first comparison signal based on the information that joins with said ramp signal and said first threshold signal correction at least.In addition; This system comprises second comparator; Be configured to receive second sensing signal and second threshold signal and generate second comparison signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises the secondary signal maker, is configured to receive at least said first comparison signal and said second comparison signal and generates modulation signal; And gate driver, be configured to receive said modulation signal and to the switch output drive signal.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises at least based on the information generation output signal that is associated with said first sensing signal.Said output signal is associated with demagnetization.In addition, this method comprises the said output signal of reception; At least generate ramp signal based on information with said output signal correction couplet; Receive said ramp signal and first threshold signal; Handle the information that joins with said ramp signal and said first threshold signal correction; At least generate first comparison signal based on information with said ramp signal and said first threshold signal correction couplet.In addition, this method comprises reception second sensing signal and second threshold signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said second sensing signal and said second threshold signal of handling; At least generate second comparison signal based on the information that is associated with said second sensing signal and said second threshold signal; Receive said first comparison signal and said second comparison signal; Handle the information that is associated with said first comparison signal and said second comparison signal; At least generate modulation signal based on the information that is associated with said first comparison signal and said second comparison signal.In addition, this method comprises the said modulation signal of reception; At least come to the switch output drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.Make the said demagnetization duration and the ratio of said switch periods keep constant.
According to another embodiment; A kind of system that is used to adjust supply convertor comprises first signal generator; Be configured to receiving inputted signal at least and generate at least and the output signal that demagnetizes and be associated, said input signal is associated with the output current of supply convertor at least.In addition, this system comprises first controller, is configured to receive at least said output signal, and at least based on coming to generate at least first control signal with the information of said output signal correction couplet; Second controller is configured to receive first sensing signal and first threshold signal and generates second control signal.Said first sensing signal is associated with first electric current of the elementary winding of the said supply convertor of flowing through.In addition, this system comprises oscillator, is configured to receive at least said first control signal, and comes to generate at least clock signal based on the information that is associated with said first control signal at least; The secondary signal maker is configured to receive at least said clock signal and said second control signal, and generates modulation signal at least.In addition, this system comprises gate driver, is configured to receive at least said modulation signal and to switch output drive signal at least.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant, and makes the peak value of said first sensing signal keep constant in size.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises: receiving inputted signal at least, and come to generate at least the output signal based on the information that is associated with said input signal at least.Said input signal is relevant with the output current of supply convertor at least, and said output signal is relevant with demagnetization.In addition, this method comprises and receives said output signal at least; Handle the information that joins with said output signal correction; At least based on coming to generate at least clock signal with the information of said output signal correction couplet.In addition, this method comprises reception sensing signal and threshold signal.Said sensing signal is associated with first electric current of the elementary winding of the said supply convertor of flowing through.In addition, this method comprises the information that is associated with said sensing signal and said threshold signal of handling; At least generate control signal based on the information that is associated with said sensing signal and said threshold signal; At least receive said clock signal and said control signal; Handle the information that is associated with said clock signal and said control signal; At least come to generate at least modulation signal based on the information that is associated with said clock signal and said control signal.In addition, this method comprises and receives said modulation signal at least; At least based on the information that is associated with said modulation intelligence to switch output drive signal at least, with flow through said first electric current of said elementary winding of influence.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.Make the said demagnetization duration and the ratio of said switch periods keep constant, and make the peak value of said first sensing signal keep constant in size.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, be configured to receive first sensing signal and generate be associated with demagnetization first export signal.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this system comprises the first ramp signal maker, is configured to receive the said first output signal and generates first ramp signal; First comparator is configured to receive said first ramp signal and first threshold signal, and generates first comparison signal based on the information with said first ramp signal and said first threshold signal correction couplet at least.In addition, this system comprises peak detector, is configured to receive the drive signal and second sensing signal and generates peak signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises amplifier, is configured to receive the said peak signal and second threshold signal and generates the second output signal through capacitor, and said capacitor is coupled to said amplifier; Second comparator is configured to receive the said second output signal and second ramp signal, and generates second comparison signal.In addition, this system comprises the secondary signal maker, is configured to receive at least said first comparison signal and said second comparison signal, and generates modulation signal; And gate driver, be configured to receive said modulation signal and export said drive signal to said peak detector and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises that generating first based on the information that is associated with said first sensing signal at least exports signal; Receive the said first output signal; At least generate first ramp signal based on information with the said first output signal correction couplet.The said first output signal is relevant with demagnetization.In addition, this method comprises said first ramp signal of reception and first threshold signal; Handle the information that joins with said first ramp signal and said first threshold signal correction; At least generate first comparison signal based on information with said first ramp signal and said first threshold signal correction couplet; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said drive signal and said second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal; Receive the said peak signal and second threshold signal; Handle the information that is associated with said peak signal and said second threshold signal; At least generate the second output signal based on the information that is associated with said peak signal and said second threshold signal.In addition, this method comprises that receiving said second exports the signal and second ramp signal; Handle the information that is associated with said second output signal and said second ramp signal; At least generate second comparison signal based on the information that is associated with said second output signal and said second ramp signal.In addition, this method comprises said first comparison signal of reception and said second comparison signal; Handle the information that is associated with said first comparison signal and said second comparison signal; At least generate modulation signal based on the information that is associated with said first comparison signal and said second comparison signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, is configured to receive first sensing signal and generates and the output signal that demagnetizes and be associated.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector, is configured to receive the drive signal and second sensing signal and generates peak signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises the secondary signal maker, is configured to handle at least the information that is associated with said output signal and said peak signal, and generates modulation signal.In addition, this system comprises gate driver, is configured to receive said modulation signal and exports said drive signal to said peak detector and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant; And make the mean size of said peak signal keep constant at first duration.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises at least based on the information generation output signal that is associated with said first sensing signal; Receive the drive signal and second sensing signal; And the information that processing is associated with the drive signal and second sensing signal.First sensing signal is associated with demagnetization, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises at least based on the information generation peak signal that is associated with said drive signal and said second sensing signal; At least handle the information that is associated with said output signal and said peak signal; At least generate modulation signal based on the information that is associated with said output signal and said peak signal.In addition, this method comprises the said modulation signal of reception; At least export said drive signal based on the information that is associated with said modulation signal to switch, to influence said first electric current of the said elementary winding of flowing through at least.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.Make the said demagnetization duration and the ratio of said switch periods keep constant; And make the mean size of said peak signal keep constant at first duration.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, be configured to receive first sensing signal and generate be associated with demagnetization first export signal.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this system comprises peak detector, is configured to receive the drive signal and second sensing signal and generates peak signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises the secondary signal maker, is configured to receive said drive signal, said first output signal and the said peak signal, and generates the second output signal; Amplifier is configured to receive said second output signal and threshold signal and generates the 3rd output signal through capacitor, and said capacitor is coupled to said amplifier.In addition, this system comprises comparator, is configured to receive said the 3rd output signal and ramp signal, and generates comparison signal; The 3rd signal generator is configured to receive at least said comparison signal and clock signal, and generates modulation signal.In addition, this system comprises gate driver, is configured to receive said modulation signal and exports said drive signal to said peak detector, said secondary signal maker and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this method comprises the first output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said drive signal and said second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal.In addition, this method comprises that receiving said drive signal, said first exports signal and said peak signal; Handle the information that is associated with said drive signal, the said first output signal and said peak signal; At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal.In addition, this method comprises that receiving said second exports signal and threshold signal; Handle the information that is associated with said second output signal and said threshold signal; At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal.In addition, this method comprises that receiving the said the 3rd exports signal and ramp signal; Handle the information that is associated with said the 3rd output signal and said ramp signal; At least generate comparison signal based on the information that is associated with said the 3rd output signal and said ramp signal.In addition, this method comprises said comparison signal of reception and clock signal; Handle the information that is associated with said comparison signal and said clock signal; At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, be configured to receive first sensing signal and generate be associated with demagnetization first export signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector, is configured to receive the drive signal and second sensing signal and generates peak signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through; And the secondary signal maker is configured to receive at least said drive signal, said first output signal and the said peak signal, and generates the second output signal.In addition, this system comprises amplifier, is configured to receive said second output signal and threshold signal and generates the 3rd output signal through capacitor; The 3rd signal generator is configured to receive said the 3rd output signal and first input signal and generates the 4th output signal.Said capacitor is coupled to said amplifier, and said first input signal is proportional with second input signal that is received by said elementary winding.In addition, this system comprises comparator, is configured to receive said the 4th output signal and second sensing signal and generates comparison signal; The 4th signal generator is configured to receive at least said comparison signal and clock signal and generates modulation signal.In addition, this system comprises gate driver, is configured to receive said modulation signal and exports said drive signal to said peak detector, said secondary signal maker and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises the first output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with the said drive signal and second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal.In addition, this method comprises that receiving said drive signal, said first exports signal and said peak signal; Handle the information that is associated with said drive signal, the said first output signal and said peak signal; At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal.In addition, this method comprises that receiving said second exports signal and threshold signal; Handle the information that is associated with said second output signal and said threshold signal; At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal; Receive said the 3rd output signal and first input signal.Said first input signal is proportional with second input signal that is received by said elementary winding.In addition, this method comprises the information that is associated with said the 3rd output signal and said first input signal of handling; At least generate the 4th output signal based on the information that is associated with said the 3rd output signal and said first input signal; Receive said the 4th output signal and second sensing signal; Handle the information that is associated with said the 4th output signal and said second sensing signal; At least generate comparison signal based on the information that is associated with said the 4th output signal and said second sensing signal.In addition, this method comprises and receives said comparison signal and clock signal at least; Handle the information that is associated with said comparison signal and said clock signal; At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises: first signal generator, be configured to receive first sensing signal and generate be associated with demagnetization first export signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector, is configured to receive the drive signal and second sensing signal and generates peak signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises the secondary signal maker, is configured to receive at least said drive signal, said first output signal and the said peak signal, and generates the second output signal; Amplifier is configured to receive said second output signal and threshold signal and generates the 3rd output signal through capacitor, and said capacitor is coupled to said amplifier.In addition, this system comprises the 3rd signal generator, is configured to receive said first sensing signal, said the 3rd output signal and said drive signal and generates the 4th output signal; Comparator is configured to receive said the 4th output signal and said second sensing signal and generates comparison signal.In addition, this system comprises the 4th signal generator, is configured to receive at least said comparison signal and clock signal and generates modulation signal; Gate driver; Be configured to receive said modulation signal and export said drive signal to said peak detector, said secondary signal maker, said the 3rd signal generator and switch, said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises the first output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with the said drive signal and second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal.In addition, this method comprises that receiving said drive signal, said first exports signal and said peak signal; Handle the information that is associated with said drive signal, the said first output signal and said peak signal; At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal.In addition, this method comprises that receiving said second exports signal and threshold signal; Handle the information that is associated with said second output signal and said threshold signal; At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal.In addition, this method comprises that receiving said first sensing signal, the said the 3rd exports signal and said drive signal; Handle the information that is associated with said first sensing signal, said the 3rd output signal and said drive signal; At least generate the 4th output signal based on the information that is associated with said first sensing signal, said the 3rd output signal and said drive signal.In addition, this method comprises that receiving the said the 4th exports signal and said second sensing signal; Handle the information that is associated with said the 4th output signal and said second sensing signal; At least generate comparison signal based on the information that is associated with said the 4th output signal and said second sensing signal.In addition, this method comprises and receives said comparison signal and clock signal at least; Handle the information that is associated with said comparison signal and said clock signal; At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment, a kind of system that is used to adjust supply convertor comprises first signal generator, is configured to receive first sensing signal and generates and the output signal that demagnetizes and be associated.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector, is configured to receive the drive signal and second sensing signal and generates peak signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises the secondary signal maker, is configured to handle at least the information that is associated with said output signal and said peak signal, and generates modulation signal; And gate driver, be configured to receive said modulation signal and export said drive signal to said peak detector and switch at least.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said drive signal is associated with switch periods, and said output signal was associated with the demagnetization duration.The said demagnetization duration equals the peak value that demagnetizes after multiplying each other with said peak signal in size.This system also is configured to make said switch periods to keep constant, makes the mean size of said demagnetization peak value keep constant at first duration, and makes said output current keep constant.
According to another embodiment, a kind of method that is used to adjust supply convertor comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises the output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said drive signal and said second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal; Handle the information that is associated with said output signal and said peak signal; At least generate modulation signal based on the information that is associated with said output signal and said peak signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.Said drive signal is associated with switch periods, and said output signal was associated with the demagnetization duration.The said demagnetization duration equals the peak value that demagnetizes after multiplying each other with said peak signal in size.Make said switch periods keep constant, make the mean size of said demagnetization peak value keep constant, and make said output current keep constant at first duration.
Depend on embodiment, can obtain one or more in these benefits.Can understand these benefits of the present invention and various other purpose, feature and advantage all sidedly with reference to following detailed and accompanying drawing.
Description of drawings
Fig. 1 is the simplification tradition diagrammatic sketch that is used to have the switching mode flyback power supply transformation system of primary side control.
Fig. 2 illustrates the output voltage of flyback power supply transformation system and the simplification tradition diagrammatic sketch of output current characteristic.
Fig. 3 is the simplification tradition diagrammatic sketch with switching mode flyback power supply transformation system of primary side sensing and modulation.
Fig. 4 is that another of switching mode flyback power supply transformation system with primary side sensing and modulation simplified traditional diagrammatic sketch.
Fig. 5 is the traditional diagrammatic sketch of another simplification with switching mode flyback power supply transformation system of primary side sensing and modulation.
Fig. 6 is the simplification diagrammatic sketch that the traditional operation mechanism of flyback power supply transformation system is shown.
Fig. 7 is the simplification diagrammatic sketch that has the switched-mode power supply transformation system of primary side sensing and adjustment according to an embodiment of the invention.
Fig. 8 be according to the embodiment of the invention by the signal sampling of carrying out as the assembly of a switched-mode power supply transformation system part and the simplified timing diagram of maintenance.
Fig. 9 is the simplification diagrammatic sketch that some assembly of adjusting according to the output voltage that is used for the switched-mode power supply transformation system of the embodiment of the invention is shown.
Figure 10 is the simplification diagrammatic sketch of some equipment that is used to generate the Demag signal that illustrates as according to the assembly of the switched-mode power supply transformation system of an embodiment of the invention part.
Figure 11 is the simplification diagrammatic sketch of some equipment that is used to generate the Sampling_clk signal that illustrates as according to the assembly of the switched-mode power supply transformation system of an embodiment of the invention part.
Figure 12 is the simplified timing diagram that is used to generate the Sampling_clk signal that illustrates as according to a part of assembly of the switched-mode power supply transformation system of the embodiment of the invention.
Figure 13 is the simplified timing diagram of switched-mode power supply transformation system according to another embodiment of the present invention.
Figure 14 (a) is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly of the part of the switched-mode power supply transformation system of the embodiment of the invention and error amplifier.
Figure 14 (b) illustrates the simplification diagrammatic sketch of conduct according to some equipment of the current source of the part of the assembly in the switched-mode power supply transformation system of the embodiment of the invention.
Figure 15 (a) is the simplification diagrammatic sketch that illustrates as some equipment of the assembly of the part of switched-mode power supply transformation system according to another embodiment of the present invention and error amplifier.
Figure 15 (b) illustrates the simplification diagrammatic sketch of conduct according to some equipment of the current source of the part of the assembly in the switched-mode power supply transformation system of the embodiment of the invention.
Figure 16 is the simplification diagrammatic sketch that illustrates as according to the CMOS realization of the assembly of the part of the switched-mode power supply transformation system of the embodiment of the invention and error amplifier.
Figure 17 illustrates the simplification diagrammatic sketch of conduct according to some equipment of the assembly of the part of the switched-mode power supply transformation system of the embodiment of the invention.
Figure 18 is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly that is used for constant output electric current (CC) control of the part of the switched-mode power supply transformation system of the embodiment of the invention.
Figure 19 is the simplified timing diagram that is used for being generated according to the pulse copy circuit of the part of the switched-mode power supply transformation system of the embodiment of the invention by conduct the D2C signal.
Figure 20 is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly that is used for the adjustment of current sense (CS) peak value of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention.
Figure 21 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 22 is as the simplification diagrammatic sketch according to a part of demagnetization detection components of the switched-mode power supply transformation system of the embodiment of the invention.
Figure 23 is the simplified timing diagram according to the switched-mode power supply transformation system that comprises the demagnetization detection components shown in Figure 21 and 22 of the embodiment of the invention.
Figure 24 is the simplification diagrammatic sketch that has the switched-mode power supply transformation system of primary side sensing and adjustment according to another embodiment of the present invention.
Figure 25 is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly that is used for the adjustment of current sense (CS) peak value of the part of the switched-mode power supply transformation system of the embodiment of the invention.
Figure 26 is the simplified timing diagram according to the switched-mode power supply transformation system of the embodiment of the invention.
Figure 27 be according to certain embodiments of the invention respectively as the simplified timing diagram of the assembly that is used for the adjustment of current sense (CS) peak value of a switched-mode power supply transformation system part.
Figure 28 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 29 is the simplified timing diagram according to the switched-mode power supply transformation system of the embodiment of the invention.
Figure 30 is as the simplification diagrammatic sketch according to a part of Cycle by Cycle peak value maker of the power converting system of the embodiment of the invention.
Figure 31 is as the simplified timing diagram according to a part of Cycle by Cycle peak value maker of the power converting system of the embodiment of the invention.
Figure 32 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 33 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 34 is as the simplification diagrammatic sketch according to a part of integrator of the power converting system of the embodiment of the invention.
Figure 35 is the simplified timing diagram according to the switched-mode power supply transformation system that comprises the integrator shown in Figure 33 and 34 of the embodiment of the invention.
Figure 36 is as the simplification diagrammatic sketch according to a part of oscillator of the power converting system of the embodiment of the invention.
Figure 37 is the simplified timing diagram according to the switched-mode power supply transformation system of the embodiment of the invention.
Figure 38 is the simplified timing diagram according to some electric current of the switched-mode power supply transformation system of the embodiment of the invention.
Figure 39 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 40 is the simplification diagrammatic sketch to the switched-mode power supply transformation system of led powered that is used for according to further embodiment of this invention.
Figure 41 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 42 is the simplified timing diagram according to the switched-mode power supply transformation system of the embodiment of the invention.
Figure 43 is the simplification diagrammatic sketch to the switched-mode power supply transformation system of led powered that is used for according to further embodiment of this invention.
Figure 44 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.
Figure 45 is the simplification diagrammatic sketch to the switched-mode power supply transformation system of led powered that is used for according to further embodiment of this invention.
Embodiment
The present invention relates to integrated circuit.More specifically, the invention provides the system and method that is used for constant voltage mode and constant current mode.As just example, the present invention has been applied to having the flyback power supply converter of primary side sensing and adjustment.But will recognize that the present invention has much wide range of application.
Fig. 7 is the simplification diagrammatic sketch that has the switched-mode power supply transformation system of primary side sensing and adjustment according to an embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Switched-mode power supply transformation system 500 comprises elementary winding 502, secondary winding 504 and auxiliary winding 506.In addition, transformation system 500 comprises resistor 510,512 and 580.In addition, transformation system 500 comprises capacitor 526, switch 550 and diode 554.In addition, transformation system 500 comprises following assembly:
● be used to generate the assembly 520 of Demag signal and Sampling_clk signal;
● be used to sample and keep the assembly 522 of one or more signals;
● error amplifier 524;
● be used for the assembly 532 of load compensation;
● be used for the assembly 534 of constant voltage (CV) control;
● be used to generate the assembly 538 of PWM/PFM modulation signal;
● be used for the assembly 540 of current sense (CS) peak value adjustment;
● be used for the assembly 542 of constant current (CC) control;
● be used to generate the assembly 546 of gate drive signal;
● oscillator 562; And
● be used for the assembly 568 of feed forward.
In one embodiment, assembly 520,522,532,534,538,540,542,546 and 568, error amplifier 524 and oscillator 562 are positioned on the chip 590.For example, chip 590 comprises terminal 516,530,552 and 566 at least.Although the one group of assembly that is used for system 500 that top utilization is selected illustrates, however can also exist manyly substitute, modification and variant.For example, some in the assembly can be expanded and/or make up.Other assembly can be inserted in those assemblies above-mentioned.Depend on embodiment, the arrangement of assembly can be exchanged with other assembly that is replaced.For example, system 500 is switching mode flyback power supply transformation systems.The further details of these assemblies can more specifically can find at this specification below.
As shown in Figure 7, according to embodiments of the invention, output voltage V OutPrimary side through transformation system 500 is come sensing.For example, output voltage V OutSensing depend on the turn ratio between secondary winding 504 and the auxiliary winding 506 at least in part.For example, secondary winding 504 closely is coupled to auxiliary winding 506.In another example, secondary winding 504 sends signal 556 to diode 554, and is coupled to the output of transformation system 500 through diode 554.
In one embodiment, the output signal 508 of auxiliary winding 506 is used V AUXExpression.In another embodiment, output signal 508 is through comprising resistor 510 (that is R, 1) and resistor 512 (that is R, 2) the processing of voltage divider.Output signal 514 (that is V, INV) be fed to terminal 516 (that is terminal INV) from this voltage divider.For example, output signal 514 has been carried out load compensation through assembly 532.In another example, the signal 514 through compensation is fed to assembly 520 and 522 among both.
According to an embodiment, assembly 532 comprises the one or more equipment shown in Figure 14 (a), 14 (b), 15 (a) and/or 15 (b).According to another embodiment, assembly 520 comprises some equipment shown in Figure 10 and 11.For example, assembly 520 is exported to assembly 522 with the Sampling_clk signal.Utilize Sampling_clk, assembly 522 generates the Holding_clk signal.
In one embodiment, assembly 522, and keeps through sampled signal based on the Holding_clk signal through compensating signal 514 sampling based on the Sampling_clk signal.For example, assembly 522 demagnetization when nearly finishing to through compensating signal 514 samplings, and keep through sampled signal till sampling next time.In another example, this sampling and maintenance are handled shown in Fig. 8.
In addition, as shown in Figure 7, through the signal V of sampling and maintenance SampBe sent out to error amplifier 524 from assembly 522.According to some embodiment, assembly 524 comprises some equipment shown in Figure 14 (a), 14 (b), 15 (a) and/or 15 (b).Error amplifier 524 also receives reference signal V RefFor example, reference signal V RefOutput loading based on transformation system 500 is compensated.In another example, signal V SampQuilt and reference signal V RefCompare, and its difference is amplified by error amplifier 524.In one embodiment, error amplifier 524 generates output signal 528 through capacitor 526.For example, capacitor 526 is connected to error amplifier 524 through terminal 530 (that is terminal COMP).In another example, output signal 528 (that is V, COMP) reflected loading condition.In another example, V COMPBe used to influence PWM/PFM switching frequency and PWM/PFM pulsewidth, so that the adjustment output voltage V Out
As shown in Figure 7, output signal 528 is sent out to assembly 532 and 534.For example, assembly 534 makes output voltage V in constant voltage (CV) pattern OutKeep constant.In another example, assembly 534 sends to assembly 538 with control signal 536, and control signal 558 is sent to oscillator 562.As response, oscillator 562 is to assembly 538 clock signals 560.
In addition, in one embodiment, also to assembly 568 output signals 570, as response, assembly 658 generates signal 572 and sends to assembly 534 error amplifier 524.In another embodiment, assembly 534 receive signals 572 and signal 528 both.
As shown in Figure 7, assembly 520 also sends to assembly 542 with the Demag signal, and assembly 542 also receives signal V SampAs response, assembly 542 output control signals 592.According to an embodiment, control signal 592 is used in constant current (CC) pattern, make output current I OutKeep constant.For example, assembly 542 comprises one or more equipment shown in figure 17.In another example, assembly 542 comes the locking switch frequency through oscillator 562 according to elementary winding inductance, and therefore compensates the variation of elementary winding inductance.In another example, make output current I in constant current (CC) pattern OutBe independent of elementary winding inductance.
According to an embodiment, assembly 538 receives signal 560,536 and 592 at least, and from the signal 574 of assembly 540.Assembly 540 also receives Vth_oc except receiving beyond the signal 564 from terminal 566 (that is, terminal CS).For example, Vth_oc representes predetermined threshold voltage levels.In another example, signal 564 is voltage signals.As response, assembly 538 is to assembly 546 output control signals 544, assembly 546 and then send drive signals 548 to switch 550.For example, control signal 544 is modulation signals.In another example, switch is power supply MOSFET.In another example, switch is power supply BJT.In another example, switch is connected to assembly 546 through terminal 552 (that is terminal Gate).In another example, drive signal 548 is by V GateExpression.
According to an embodiment, control signal 544 is used to confirm the ON time and the switching frequency of PWM/PFM control.For example, bigger V COMPSize can produce long ON time, and therefore generation is delivered to the higher power level of output.In another example, bigger V COMPSize can produce higher switching frequency, and therefore generation is delivered to the higher power level of output.According to another embodiment, the ON time of PWM/PFM control is confirmed by assembly 538, and the switching frequency of PWM/PFM control is confirmed by oscillator 562.
Like top discussion and stress further that here Fig. 7 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, transformation system 500 also comprises not at the one or more assemblies shown in Fig. 5.In another example, transformation system 500 also comprises not in the one or more connections shown in Fig. 5.In another example, transformation system 500 comprises the one or more assemblies different with assembly shown in Figure 5.In another example, transformation system 500 comprises the one or more connections different with connection shown in Figure 5.In another example, capacitor 526 can be used to another circuit replacement of loop stability compensation.
Fig. 8 be according to the embodiment of the invention by the signal sampling of carrying out as the assemblies 522 of switched-mode power supply transformation system 500 part and the simplified timing diagram of maintenance.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
As shown in Figure 8, waveform 610 expressions are as the V of the function of time Gate, waveform 620 expressions are as the V of the function of time AUX, waveform 630 expressions are as the V of the function of time INV, and waveform 660 expressions are as the V of the function of time SampIn addition, waveform 640 expressions are as the Sampling_clk signal of the function of time, and waveform 650 expressions are as the Holding_clk signal of the function of time.
With reference to figure 7, the signal V shown in waveform 610 GateBe sent to switch 550.For example, according to embodiments of the invention, pass through V at switch 550 GateAnd after ending, be stored in energy in the elementary winding 502 just be sent to auxiliary winding 506 and secondary winding 504 both.In another example, the signal V shown in waveform 620 AUXThe signal 556 at simulation secondary winding 504 places.In one embodiment, signal 556 has reflected the output voltage V when closing on each demagnetization period finishes OutIn another example, the signal V shown in waveform 630 INVSimulate each demagnetization signal V shown in waveform 620 during period AUX
In addition, according to one embodiment of the invention, the pulse that waveform 640 shows signal Sampling_clk is generated when the demagnetization period finishes.According to another embodiment, the pulse that waveform 650 shows signal Holding_clk is generated when the demagnetization period finishes.
According to an embodiment, shown in waveform 630, signal V INVTrailing edge at the Sampling_clk signal is sampled, and during the remainder of clock cycle, is held.For example, signal V INVBe used to generate signal V through sampling and the value that keeps SampIn another example, signal amplitude V aThe output voltage that has reflected assembly 522.
Like top discussion and further stress that here Fig. 8 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, V aChange from a sampling clock cycle to another sampling clock cycle, so V SampAlso change in size from a sampling clock cycle to another sampling clock cycle.
Fig. 9 is the simplification diagrammatic sketch that some assembly of adjusting according to the output voltage that is used for switched-mode power supply transformation system 500 of the embodiment of the invention is shown.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in Fig. 7 and 9, according to an embodiment, voltage divider receives the signal 508 from auxiliary winding 506, and to terminal INV output signal 514.In another embodiment, signal 514 is carried out load compensation through assembly 532.Through the compensation signal 514 be fed to assembly 520 and 522 both.
For example, assembly 522 to through compensating signal 514 samplings, and keeps sampling up to next time through sampled signal when closing on demagnetization and finish.Signal V through sampling and maintenance SampBe sent out to error amplifier 524 from assembly 522, error amplifier 524 also receives reference signal V RefSignal V SampQuilt and reference signal V RefCompare, and its difference is amplified by error amplifier 524.
In one embodiment, error amplifier 524 generates output signal 528 through capacitor 526.For example, capacitor 526 is connected to error amplifier 524 through terminal 530 (that is terminal COMP).In another example, output signal 528 (that is V, COMP) reflected loading condition, and influence PWM/PFM switching frequency and PWM/PFM pulsewidth, so that the adjustment output voltage V Out
Shown in Fig. 7 and 9, according to an embodiment, output signal 528 (that is V, COMP) be sent out to assembly 534.For example, assembly 534 sends to assembly 538 with control signal 536, and control signal 558 is sent to oscillator 562.In one embodiment, control signal 558 is the electric currents that are injected into oscillator 562.As response, oscillator 562 processing control signals 558 are so that confirm the frequency of clock signal 560, and to assembly 538 clock signals 560.In another example, assembly 538 receive signals 560 with 536 both, and export control signals 544 to assembly 546.Assembly 546 is handled this control signal 544 so that confirm PWM/PFM switching frequency and PWM/PFM pulsewidth.In one embodiment, the PWM/PFM pulsewidth is used for confirming the electric current of elementary winding 502.The electric current of elementary winding 502 and PWM/PFM switching frequency are used to adjust output voltage together, and in the CV pattern, keep its constant size.
According to an embodiment, if V CompSize less than predetermined value, then power converting system 500 is in the CV pattern.For example, if voltage V SampEqual V in size Ref, V then CompLess than predetermined value.In the CV pattern, V CompBe used for regulating PWM/PFM switching frequency and/or pulsewidth.For example, PWM/PFM switching frequency and PWM/PFM pulsewidth Be Controlled are so that make output voltage V OutKeep constant.
According to another embodiment, if V CompSize surpass predetermined value, then power converting system 500 is in the CC pattern.For example, if voltage V SampBe lower than V in size Ref, V then CompWill be above predetermined value.In the CC pattern, in order to adjust output current I Out, voltage V SampBe used to the control switch frequency.For example, PWM/PFM switching frequency and V SampLinearly proportional, V SampAnd then and output voltage V OutRatio.
As discussed above, according to some embodiments of the invention, with reference to figure 7, assembly 520 comprises the equipment shown in Figure 10 and 11.
Figure 10 is the simplification diagrammatic sketch of some equipment that is used to generate the Demag signal that illustrates as according to the assembly 520 of the switched-mode power supply transformation system of the embodiment of the invention 500 parts.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in Fig. 7 and 10, signal V INVCompare with two threshold voltages by assembly 520 receptions and quilt.A threshold voltage is V Th1, another threshold voltage is V Samp-V Th2V Th1And V Th2Be predetermined constant, and V SampBe the previous voltage of sampling out that receives from assembly 522.At least in part based on signal V INVWith the comparison of two threshold voltages, the Demag signal is generated.For example, the demagnetization period is to be detected, so that generate the Demag signal.
Figure 11 is the simplification diagrammatic sketch of some equipment that is used to generate the Sampling_clk signal that illustrates as according to the assembly 520 of the switched-mode power supply transformation system of the embodiment of the invention 500 parts.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 10, the Demag signal is generated.At least in part based on the Demag signal, other signal P In1, P In2, S Ync1, S Ync2, Samp1 and Samp2 are also generated, and be shown in figure 11.The duration information of Demag signal is integrated the device storage.For example, integrator comprises switch and capacitor 910 and 920 (that is, being respectively capacitor C1 and C2).In another example, the voltage of capacitor C1 and C2 is respectively the V at node 912 places C1V with node 922 places C2
In one embodiment, switch is by signal P In1And P In2Control.The duration information of the Demag signal of being stored in another embodiment, is used to the timing of next pulse of definite Sampling_clk signal.For example, next pulse of Sampling_clk signal just in time occurred before the demagnetization period finishes, and is as shown in Figure 8.In addition, the width of next pulse is confirmed by monostable (one-shot) device 930.
Figure 12 is the simplified timing diagram that is used to generate the Sampling_clk signal that illustrates as according to the assembly 520 of the switched-mode power supply transformation system of the embodiment of the invention 500 parts.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 12, waveform 1010 expressions are as the Sampling_clk signal of the function of time, and waveform 1020 expressions are as the Tpau signal of the function of time, and waveform 1030 expressions are as the Samp1 signal of the function of time.In addition, waveform 1040 expressions are as the V of the function of time C2In addition, waveform 1050 expressions are as the S of the function of time Ync2Signal, waveform 1060 expressions are as the P of the function of time In1Signal, and waveform 1070 expressions are as the Demag signal of the function of time.For example, Sampling_clk signal, Tpau signal, Samp1 signal, S Ync2Signal, P In1Signal and Demag signal.
According to an embodiment, the timing of Sampling_clk signal is based on that timing and the duration of interim Demag signal the last week confirm, and P In1And P In2Each of signal is to generate based on duration of the Demag signal in the current period at least in part.For example, the duration of Demag signal is the pulsewidth of Demag signal shown in figure 12.According to another embodiment, the Samp1 signal has the pulsewidth identical with the Samp2 signal.For example, pulsewidth equals the time interval between ending of switch 550 and next sampling.In another example, Samp1 and Samp2 signal are used to confirm the timing of Sampling_clk signal.
In one embodiment, P In1Relation between signal and the Samp2 signal can be described through following poor equality.
βP in1(k-1)-α*Samp 2(k-1)-A*δ(k)＝Samp 2(k) (9)
Wherein, P In1Expression P In1Signal, and Samp 2Expression Samp2 signal.This relation can further be described through following Z-transformation:
βP in1(Z)Z -1-α*Samp 2(Z)Z -1-A＝Samp 2(Z) (10)
With Samp 2 ( Z ) = β * P In 1 ( Z ) Z - - A 1 + α * Z - 1 = β * P In 1 ( Z ) Z - 1 1 + α * Z - 1 - A 1 + α * Z - 1 - - - ( 11 )
Wherein, A is constant initial value.
In addition, second (time → ∞); Therefore
Samp 2 ≈ β * P in 1 Z - 1 1 + α * Z - 1 - - - ( 12 )
Can find out from equality 12, the pulsewidth of Samp2 signal each cycle according to the last week interim Demag signal duration be updated,
Figure 13 is the simplified timing diagram of switched-mode power supply transformation system 500 according to another embodiment of the present invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 13, waveform 1110 expressions are as the V of the function of time Out, waveform 1120 expressions are as the V of the function of time INV, and waveform 1130 expressions are as the Demag signal of the function of time.In addition, waveform 1140 expressions are as the voltage level of the signal 564 at the terminal CS place of the function of time, and waveform 1150 expressions are as the signal 548 at the terminal Gate place of the function of time.
As discussed above; According to certain embodiments of the invention, with reference to figure 7, assembly 532 comprises the one or more equipment shown in Figure 14 (a), 14 (b), 15 (a) and/or 15 (b); And assembly 524 comprises some equipment shown in Figure 14 (a), 14 (b), 15 (a) and/or 15 (b).
Figure 14 (a) is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly 532 of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention and error amplifier 524.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in Figure 14 (a), assembly 532 comprises current source 1230, and error amplifier 524 comprises assembly 1210 and trsanscondutance amplifier 1220.For example, assembly 1210 is confirmed two input signals difference in size.
For example, assembly 1210 receives voltage signal V SampWith reference signal V Ref, and the generation size equals V Ref-V SampSignal 570.In another example, trsanscondutance amplifier 1220 amplifying signals 570 are to generate output signal 528.According to an embodiment, output signal 528 is received by capacitor 526.For example, capacitor 526 usefulness act on the low pass filter of closed circuit.In addition, the assembly 568 a part of as the feed forward path provides zero to closed circuit, to improve the operational stability of transformation system 500.
Current source 1230 generates the electric current I _ COMPEN_P that changes along with output loading.Electric current I _ COMPEN_P flow through terminal INV and resistor 512.For example, electric current I _ COMPEN_P is used for compensating the voltage drop that causes because of cable and along with output current I OutOther voltage loss that changes.In another example, the I_COMPEN_P electric current reaches its maximum when no-load condition, and vanishing when full-load conditions.
According to an embodiment, through load compensation, output voltage V OutCan be expressed as as follows.
V out = k · V Ref + 1 n V D 1 - k · ICOMPEN _ P · ( R 1 / / R 2 ) - - - ( 13 )
Wherein, n is the turn ratio between auxiliary winding 506 and the secondary winding 504.In addition, V D1Be the forward direction diode drop of diode 554, and
k = R 1 + R 2 n · R 2 - - - ( 14 )
For example, last expression in the equality 13 is used to offset the compensating factor of the voltage drop that causes because of cable.
Figure 14 (b) illustrates the simplification diagrammatic sketch of conduct according to some equipment of the current source 1230 of the part of the assembly 532 in the switched-mode power supply transformation system 500 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
With reference to Figure 14 (a), assembly 532 comprises current source 1230.Shown in Figure 14 (b), current source 1230 comprises that voltage is to current converter 1240, constant-current source 1250 and assembly 1260.For example, assembly 1260 is confirmed two input signals difference in size.
For example, signal 528 (that is V, COMP) receive and be converted into electric current I _ COMPEN by voltage to current converter 1240.In another example, constant-current source 1250 generates constant current Icc.Electric current I cc and I_COMPEN are received by assembly 1260, and assembly 1260 generates electric current I _ COMPEN_P.In one embodiment, electric current I _ COMPEN_P equals Icc-I_COMPEN.In another embodiment, if V COMPBecome big, then electric current I _ COMPEN_P diminishes.
Figure 15 (a) is the simplification diagrammatic sketch that illustrates as some equipment of the assembly 532 of the part of switched-mode power supply transformation system 500 according to another embodiment of the present invention and error amplifier 524.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in Figure 15 (a), assembly 532 comprises current sink 1330, and error amplifier 524 comprises assembly 1310 and trsanscondutance amplifier 1320.For example, assembly 1310 is confirmed two input signals difference in size.
For example, assembly 1310 receives voltage signal V SampWith reference signal V Ref, and the generation size equals V Ref-V SampSignal 570.In another example, trsanscondutance amplifier 1320 amplifying signals 570 are to generate output signal 528.According to an embodiment, output signal 528 is received by capacitor 526.For example, capacitor 526 usefulness act on the low pass filter of closed circuit.In addition, the assembly 568 a part of as the feed forward path provides zero to closed circuit, to improve the operational stability of transformation system 500.
Current sink 1330 generates the electric current I _ COMPEN_N that changes along with output loading.Electric current I _ COMPEN_N flow through resistor 510 and terminal INV.For example, electric current I _ COMPEN_N is used for compensating the voltage drop that causes because of cable and along with output current I OutOther voltage loss that changes.In another example, the I_COMPEN_N electric current reaches its maximum when full-load conditions, and vanishing when no-load condition.
Figure 15 (b) illustrates the simplification diagrammatic sketch of conduct according to some equipment of the current sink 1330 of the part of the assembly 532 in the switched-mode power supply transformation system 500 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
With reference to Figure 15 (a), assembly 532 comprises current sink 1330.Shown in Figure 15 (b), current sink 1330 comprises that voltage is to current converter 1340 and the current mirror that comprises resistor 1350 and 1360.For example, signal 528 (that is V, COMP) receive and be converted into electric current I _ COMPEN by voltage to current converter 1340.In another example, electric current I _ COMPEN is received by current mirror, and current mirror generates electric current I _ COMPEN_N.In one embodiment, electric current I _ COMPEN_N equals m * I_COMPEN, and m is a positive integer.In another embodiment, if V COMPBecome big, then electric current I _ COMPEN_N also becomes big.
Figure 16 illustrates the simplification diagrammatic sketch of realizing as the CMOS according to the assembly 568 of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention and error amplifier 524.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Figure 17 illustrates the simplification diagrammatic sketch of conduct according to some equipment of the assembly 542 of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 17, assembly 542 comprises that voltage is to current converter 1510, assembly 1520 and phase-locked loop 1530.For example, assembly 1520 is confirmed two input signals difference in size.In another example, assembly 1520 receives from voltage to the signal 1512 of current converter 1510 with from the signal 1534 of phase-locked loop 1530, and the signal 1522 of output expression signal 1512 and the difference of the size of signal 1534.
Shown in Fig. 7 and 17, assembly 522 sampled signals 514 and generation signal V SampIn addition, the Demag signal is generated by assembly 520.In one embodiment, the electric current of the duration of Demag signal and elementary winding 502 is proportional and also proportional with the electric current of secondary winding 504.For example, the duration of Demag signal is the pulsewidth of Demag signal shown in figure 12.
In one embodiment, if signal V SampIn size less than signal V Ref, V then CompSize surpass predetermined value, and power converting system 500 is in the CC pattern.For example, V CompSize when reaching its maximum, the CC pattern is detected.In another embodiment, in the CC pattern, the PWM/PFM switching frequency is by voltage V SampControl.For example, PWM/PFM switching frequency and V SampLinearly proportional, V SampAnd then and output voltage V OutRatio.
For example, in the CC pattern, the V under the interrupted conduction mode (DCM) OutProvide by following formula:
Po = Vo * Io = 1 2 η L P F SW I p 2 - - - ( 15 )
Wherein, Po representes the power output of transformation system 500.In addition, Vo and Io represent output voltage V respectively OutWith output current I OutIn addition, Lp representes the inductance of elementary winding 502, and Fsw representes switching frequency, and Ip representes the peak current of elementary winding 502.η is a constant.
If Fsw and V SampProportional, then Fsw is also proportional with Vo, as follows.
F SW＝εVo (16)
Wherein, ε is a constant.Combination equality 15 and 16, then
Io = 1 2 η L P F SW Vo I p 2 = 1 2 η L P ϵ I p 2 - - - ( 17 )
Since η be the ε constant, therefore if Ip is accurately controlled with Lp, then output current Io is constant.But, if Lp is not by accurate control, even then Io also possibly change in the CC pattern.
Alternatively, if L p = F SW Vo = α - - - ( 18 )
Wherein, α is a constant, then
Io = 1 2 ηα I p 2 - - - ( 19 )
Therefore, if, then can make Io constant if Ip is accurately controlled and equality 18 is satisfied.
In addition, for the inverse-excitation type operation, according to an embodiment, can be through the inductance L s of secondary winding 504, the peak current I of secondary winding 504 P_secAnd output voltage V o confirm the demagnetization duration, as follows.For example, the demagnetization duration is identical with the duration (pulsewidth of Demag signal for example shown in Figure 12) of Demag signal.
T Demag = Ls × I P _ sec Vo - - - ( 20 )
Because Ls and Lp is proportional and I P_secProportional with Ip, therefore
T Demag = β Lp × I P Vo - - - ( 21 )
Wherein, β is a constant.If satisfied equality 18, then
T Demag × F SW = β Lp × I P Vo × F SW = αβ I p - - - ( 22 )
Therefore, if Ip is by accurately control, then
T Demag×F SW＝γ (23)
And I p = γ α β - - - ( 24 )
Wherein, γ is a constant.Combination equality 19 and 24,
Io = 1 2 β ηγ I p - - - ( 25 )
According to an embodiment, shown in Fig. 7 and 17, in the CC pattern, the PWM/PFM switching frequency is by phase-locked loop 1530 lockings.
For example, F SW = γ T Demag - - - ( 26 )
And Io ∝ γ I p(27)
According to another embodiment, through according to equality 26 based on T DemagRegulate F Sw, it is constant that γ keeps.For example, be to be equal to or greater than 0.25 and be equal to or less than 0.75 constant.Therefore, if according to equality 27 will be except γ I pAlso be controlled to be constantly, then output current Io is retained as constant.
For example, assembly 542 comes locking switch frequency F according to the inductance of elementary winding 502 SW, therefore and compensated the variation of elementary winding inductance.In another example, make output current I in constant current (CC) pattern OutBe independent of elementary winding inductance.According to an embodiment, shown in Fig. 7 and 17, oscillator 562 is from the signal 1522 as the assembly 1520 of assembly 542 part, and to the phase-locked loop 1530 tranmitting data register signals 1532 as assembly 542 parts.
Figure 18 is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly 542 that is used for constant output electric current (CC) control of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 18, assembly 542 comprises pulse copy circuit 1620, phase detectors 1630, charge pump 1640 and self-calibration circuit 1650.In one embodiment, pulse copy circuit 1620 receives from the signal of assembly 520 and from the clock signal 1614 of Clock dividers 1610, and generates signal 1629.Clock signal 1614 usefulness CLK4 represent, and signal 1629 usefulness D2C represent.For example, the D2C signal is the copy of Demag signal, but synchronous with clock signal clk 4.
In another embodiment, pulse copy circuit 1620 comprises NAND (with non-) door 1622, MOS transistor 1624 and 1626, and capacitor 1628.For example, NAND door 1622 receives Demag signal and clock signal 1614, and formation voltage signal D2.Shown in figure 18, voltage signal D2 controls MOS transistor 1624.For example, if signal D2 is a logic low, then MOS transistor 1624 passes through electric current I P2To capacitor 1628 chargings.In another example, if signal D2 is a logic high, then MOS transistor 1626 passes through electric current I N2To capacitor 1628 discharges.According to an embodiment, be close to before such discharge the pulsewidth the when voltage of capacitor 1628 has reflected signal D2 low voltage level.According to another embodiment, electric current I P2Equal electric current I N2Pulsewidth when for example, the pulsewidth during signal D2 low voltage level is with signal D2C high-voltage level is identical.In another example, the trailing edge of the rising edge of signal D2C and clock signal 1614 is synchronous.In another example, the rising edge of signal D2C is synchronous with the trailing edge of the clock signal of being represented by CLK2 1612.
Figure 19 is the simplified timing diagram that is used for being generated according to the pulse copy circuit 1620 of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention by conduct the D2C signals.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Waveform 1710 expressions are as the clock signal clk 2 of the function of time, and waveform 1720 expressions are as the clock signal clk 4 of the function of time, and waveform 1730 expressions are as the Demag signal of the function of time.In addition, waveform 1740 expressions are as the D2 signal of the function of time, and waveform 1750 expressions are as the D2C signal of the function of time.
Shown in figure 19, the result, the trailing edge of the rising edge of D2C signal and clock signal clk 2 and the trailing edge of clock signal clk 4 are synchronous.In addition, shown in figure 19, the pulsewidth of the pulsewidth during Demag signal high-voltage level during with D2C signal high-voltage level is identical.
With reference to Figure 18, signal 1629 is outputed to phase detectors 1630 from pulse copy circuit 1620.Phase detectors 1630 comprise d type flip flop 1632.The pulsewidth of pulsewidth when for example, d type flip flop 1632 is with D2C signal high-voltage level during with clock signal clk 2 low voltage levels compared.
In one embodiment, if the pulsewidth of the pulsewidth during D2C signal high-voltage level during greater than clock signal clk 2 low voltage levels, then the signal 1634 at Q terminal place is a high-voltage level, and the signal 1636 at QN terminal place is a low voltage level.In another embodiment, if the pulsewidth of the pulsewidth during D2C signal high-voltage level during less than clock signal clk 2 low voltage levels, then the signal 1634 at Q terminal place is a low voltage level, and the signal 1636 at QN terminal place is a high-voltage level.
Shown in figure 18, signal 1634 and 1636 is received by charge pump 1640.Charge pump 1640 comprises capacitor 1642.For example, capacitor 1642 is in response to signal 1634 and 1636 and be recharged or discharge.In another example, the charging of capacitor 1642 and discharge are used to adjustment by I CcThe current signal 1644 of expression.
According to an embodiment, current signal 1644 is received by oscillator 562, and oscillator 562 generates clock signal 1660.For example, current signal 1644 is used to adjust the bias current of oscillator 562, with the frequency of adjustment clock signal 1660.
Further stress that like top discussion and at this Fig. 7 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, shown in figure 18, transformation system 500 comprises Clock dividers 1610, its receive clock signal 1660 and generation clock signal 1612 and 1614.
According to an embodiment, the frequency of clock signal 1612 is frequency half the of clock signal 1660.According to another embodiment, the frequency of clock signal 1612 is that the twice of frequency of clock signal 1614 is big.For example, shown in figure 19, the trailing edge of the trailing edge of clock signal 1614 (that is, clock signal clk 4) and clock signal 1612 (that is, clock signal clk 2) is synchronous.
Return Figure 18, clock signal 1612 and 1614 is outputed to assembly 542 and is used for constant current (CC) control.For example, clock signal 1532 shown in figure 17 is represented clock signals 1612 and 1614.In another example, although Fig. 7 and 17 does not clearly illustrate Clock dividers 1610, yet according to an embodiment, Clock dividers 1610 is parts of transformation system 500.
As response, assembly 542 generates the current signal 1644 that is received by oscillator 562.For example, current signal 1644 is signals 1534 shown in figure 17.According to an embodiment, oscillator 562, Clock dividers 1610 and assembly 542 form loop.
For example, this loop has sufficiently high gain.In another example, this loop become stable after, two double-lengths of the pulsewidth the when cycle of clock signal 1612 is locked into Demag signal high-voltage level.In one embodiment, the pulsewidth during pulsewidth during Demag signal high-voltage level and clock signal 1612 (, clock signal clk 2) high-voltage level is identical, shown in figure 19.Pulsewidth when in another embodiment, the cycle of clock signal 1612 equals a constant and multiply by Demag signal high-voltage level.For example, this constant equals 1/ γ..
In addition, shown in figure 19 and as top the discussion, according to embodiments of the invention, the pulsewidth of the pulsewidth during Demag signal high-voltage level during with D2C signal high-voltage level is identical.Therefore, for example, the pulsewidth of the pulsewidth during D2C signal high-voltage level during with clock signal clk 2 high-voltage levels is identical.
Refer again to Figure 18, self-calibration circuit 1650 is configured to calibration current I P2Size and electric current I N2Size.For example, electric current I P2Size equal electric current I N2Size.
According to an embodiment, shown in figure 18, Demag signal and clock signal clk 4 are fed to the loop that comprises oscillator 562, Clock dividers 1610 and assembly 542.The frequency of this loop adjustment clock signal clk 2 is so that the frequency of clock signal clk 2 is locked into the frequency of Demag signal.For example, the frequency of clock signal clk 2 equals the switching frequency of drive signal 548, shown in equality 26.
As discussed above, in one embodiment, output current I OutThe peak current I of the elementary winding 502 when ending by switch 550 pConfirm.But, peak current I pMaybe be owing to the propagation delay of control circuit along with ac input voltage (for example, the VAC among Fig. 7) changes.For example, higher ac input voltage will produce higher peak current I p, vice versa.Therefore, according to an embodiment, regardless of importing AC voltage, peak current I pAll constant level should accurately be controlled at.
Figure 20 is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly 540 that is used for the adjustment of current sense (CS) peak value of the part of the switched-mode power supply transformation system 500 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 20, assembly 540 comprises high-speed comparator 1810, charge pump 1820, dynamic threshold maker 1830 and overcurrent protection (OCP) comparator 1840.
In one embodiment, high-speed comparator 1810 also receives Vth_oc except receiving outside the signal 564 from terminal 566 (that is, terminal CS).For example, the electric current of the elementary winding 502 of flowing through is by resistor 580 sensings, and the resistance of resistor 580 is represented with Rs.As shown in Figure 7, the electric current 582 that its size is represented by the Is resistor 580 of flowing through, and as response, resistor 580 generates the voltage signal 564 that its sizes are represented with Vcs.In another example, when switch 550 just ended, the Vcs quilt was compared with Vth_oc.
In another embodiment, high-speed comparator 1810 is compared Vth_oc with signal 564, and generates comparison signal 1812.Comparison signal 1812 is represented by OCP_det.For example, comparison signal 1812 is received by charge pump 1820.In another example, charge pump 1820 comprises RS latch 1822 and capacitor 1824.In one embodiment, RS latch 1822 receives comparison signal 1812, and as the charging and the discharge that respond control capacitance device 1824.In another embodiment, capacitor 1824 provides voltage signal 1826, and it is received by dynamic threshold maker 1830.
In another embodiment, dynamic threshold maker 1830 converts voltage signal 1826 into current signal.For example, the current signal after the conversion is handled by current mirror, and this current mirror generates dynamic current signal 1832.Dynamic current signal 1832 usefulness Iocp_PWM represent.In another example, current signal 1832 is received by dynamic electric resistor device 1834, and dynamic electric resistor device 1834 is represented by R2.In one embodiment, dynamic electric resistor device 1834 comprises linear resistor 1836 and transistor 1838 and 1839.For example, transistor 1838 and 1839 provides the resnstance transformer relevant with temperature.
In another embodiment, dynamic electric resistor device 1834 converts current signal 1832 into voltage signal 1835.Voltage signal 1835 usefulness OCP_ref represent.For example, if Vth_oc in size less than voltage signal 564, then voltage signal 1835 will be transferred lowlyer by dynamic threshold value maker 1830.In another example, if Vth_oc in size greater than voltage signal 564, then voltage signal 1835 will be transferred higherly by dynamic threshold value maker 1830.
Shown in figure 20, voltage signal 1835 is received by overcurrent protection (OCP) comparator 1840.OCP comparator 1840 also receives the signal 564 from terminal 566 (that is terminal CS).For example, OCP comparator 1840 is compared OCP_ref with signal 564, and generates signal 574.In another example, signal 574 is received by assembly 538, to adjust the peak current of elementary winding 502.
As discussed above, signal 564 is for example compared with Vth_OC by high-speed comparator 1810, and is compared with OCP_ref by OCP comparator 1840.In one embodiment, high-speed comparator 1810, charge pump 1820, dynamic threshold maker 1830, OCP comparator 1840 and other assembly have formed the loop with high-gain.In another embodiment, even the change of line voltage causes the change of the slope of signal 564, the peak current of elementary winding 502 also is maintained at constant level.In another embodiment, even the propagation delay of PWM/PFM signal changes, the peak current of elementary winding 502 also is maintained at constant level.
According to another embodiment, shown in figure 20, comparison signal 1812 is used to control charge pump 1820, to regulate the voltage signal of being represented by OCP_ref 1835.For example, voltage signal 1835 is as the threshold voltage of OCP comparator 1840.The result; According to certain embodiments of the invention, the peak current of elementary winding 502 is adjusted into by inner loop and makes that peak current equals
Figure BSA00000443883900411
and the size of pipeline voltage is not how.Therefore, based on equality 25, constant output current for example is as follows.
Io = 1 2 β ηγ Vth _ oc Rs - - - ( 28 )
In another example, through adjusting by V INVThe output signal 514 of expression comes control output voltage Vo.Therefore, according to some embodiments of the invention, can in CV pattern and CC pattern, obtain constant voltage Vo and constant current Io respectively.For example, the CC pattern can be applicable to for battery charge till the voltage of battery reaches predetermined size.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; As shown in Figure 7) (for example comprise first signal generator; Shown in assembly 520), be configured to receiving inputted signal and generation and demagnetize first output signal that is associated and the second output signal that is associated in sampling at least at least.In addition; This system comprises that sampling component (for example; Shown in assembly 522); Be configured at least the receiving inputted signal and the second output signal, come sampled input signal based on the information that joins with the second output signal correction at least, and generate at least with one or more and the 3rd export signals through what sample size was associated.In addition, this system comprises error amplifier (for example, shown in assembly 524), is configured to receive at least the 3rd output signal and first threshold voltage and generates the 4th output signal at least through capacitor, and this capacitor is coupled to this error amplifier.In addition, this system comprises compensation assembly (for example, shown in assembly 532), is configured to receive at least the 4th output signal and generates compensating signal at least.Input signal is the combination of the compensating signal and first sensing signal.First sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and secondary winding is associated with the output current and the output voltage of this supply convertor.In addition, this system comprises first controller (for example, shown in assembly 542) that is used for adjusting at least output current.For example, first controller is configured to receive at least the first output signal and the 3rd output signal, and at least based on coming to generate at least first control signal with the information of the first output signal and the 3rd output signal correction couplet.In addition, this system comprises second controller (for example, shown in assembly 534) that is used for adjusting at least output voltage.For example, second controller is configured to receive at least the 4th output signal and comes to generate at least second control signal (for example, shown in signal 558) and the 3rd control signal (for example, shown in signal 536) based on the information that joins with the 4th output signal correction at least.In addition; This system comprises that oscillator (for example; Shown in assembly 562), be configured to receive at least first control signal and second control signal and generate clock signal at least, and the secondary signal maker is (for example; Shown in assembly 538), be configured at least receive clock signal, the 3rd control signal and the 4th control signal and generate modulation signal at least.In addition, this system comprises gate driver (for example, shown in assembly 546), is configured to receive at least modulation signal and exports to switch to major general's drive signal.For example, this switch is configured to influence first electric current of the elementary winding that is coupled to secondary winding of flowing through.In addition, this system comprises the 3rd controller (for example, shown in assembly 540), is used for adjusting at least peak current.For example, the 3rd controller is configured to receive the 3rd control signal, second sensing signal and second threshold voltage, and the 4th control signal is exported to the secondary signal maker.In another example, second sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.
For example, this system also comprises feed forward assembly (for example, shown in assembly 568); (for example be configured to from error amplifier; Shown in assembly 524) receive the 5th output signal, and the 6th output signal is exported to second controller (for example, shown in assembly 534).In another example; This system is configured to when the 4th exports signal in size greater than predetermined value, output current is adjusted into the constant current level; And when the 4th exports signal in size less than this predetermined value, output voltage is adjusted into constant voltage level.In another example; Sampling component (for example; Shown in assembly 522) be configured to when the period of demagnetizing finishes to be perhaps approaching demagnetization period end at least sampling processing of income signal execution; Generate first through sample size, and keep this first to be generated as through sample size up to second through sample size and to end, first is one or more in sample size two through sample size and second through sample size.In another example; First signal generator (for example; Shown in assembly 520 and shown in Fig. 7 and 10) also be configured to finish the 3rd output signal; At least based on confirming the 3rd threshold voltage, the 3rd threshold voltage and income signal are compared in size, and generate the first output signal based on information at least with the 3rd threshold voltage and income signal correction couplet with the information of the 3rd output signal correction couplet.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Shown in Fig. 7 and 9) comprise sampling component (for example, shown in assembly 522), be configured to receiving inputted signal at least; Sampled input signal, and generate at least and one or more first output signals that are associated through sample size.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition, this system comprises error amplifier (for example, shown in assembly 524), is configured to receive at least the first output signal and threshold voltage and generates the second output signal through the circuit that is used for the loop stability compensation, and generate the 3rd output signal.For example, capacitor (for example, shown in capacitor 526) when being used for the circuit of loop stability compensation, and this capacitor is coupled to this error amplifier.In addition, this system comprises feed forward assembly (for example, shown in assembly 568), is configured to receive the 3rd output signal, and generates the 4th output signal based on the information with the 3rd output signal correction couplet at least; And controller (for example, shown in assembly 534), be used for adjusting at least output voltage.For example, controller is configured to receive at least the second output signal and the 4th output signal, and generates first control signal at least.In addition, this system comprises signal generator (for example, shown in assembly 538), is configured to receive at least first control signal and comes to generate at least modulation signal based on the information that is associated with first control signal at least; And gate driver (for example, shown in assembly 546), be configured to receive at least modulation signal and export to switch to major general's drive signal.For example, this switch is configured to influence first electric current of the elementary winding that is coupled to secondary winding of flowing through.
For example, this controller (for example, shown in assembly 534) also is configured to when second exports signal in size less than predetermined value, output voltage is adjusted into constant voltage level.In another example, this system also comprises compensation assembly (for example, shown in assembly 532), is configured to receive at least the second output signal and generates compensating signal based on the information with the second output signal correction couplet at least.For example, the combination of compensating signal and sensing signal during input signal, and sensing signal is associated with first winding that is coupled to secondary winding at least.
According to another embodiment, a kind of system that is used to adjust supply convertor is for example by Fig. 7,14 (a) and 14 (b) or by shown in Fig. 7,15 (a) and 15 (b).This system comprises sampling component (for example, shown in assembly 522), is configured to receiving inputted signal at least, sampled input signal, and generate at least and one or more first output signals that are associated through sample size; And error amplifier (for example, shown in assembly 524), being configured to receive at least the first output signal and threshold voltage and generating the second output signal, and generate the 3rd output signal through capacitor, this capacitor is coupled to this error amplifier.In addition, this system comprises feed forward assembly (for example, shown in assembly 568), is configured to receive the 3rd output signal, and generates the 4th output signal based on the information with the 3rd output signal correction couplet at least; And controller (for example, shown in assembly 534), be configured to receive at least the second output signal and the 4th output signal, and generate control signal at least.In addition; This system comprises that compensation assembly (for example; Shown in assembly 532), be configured to receive at least the second output signal and come to generate at least compensating signal based on the information that joins with the second output signal correction at least, input signal is the combination of compensating signal and another signal.
For example, second output voltage signal during signal, and current signal during compensating signal.Another example person, this system also comprises signal generator (for example, shown in assembly 538), is configured to receive at least control signal, and comes to generate at least modulation signal based on the information that is associated with control signal at least; And gate driver (for example, shown in assembly 546), being configured to receive at least modulation signal, and exporting to switch to major general's drive signal, this switch is configured to influence the electric current of elementary winding of supply convertor of flowing through.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Shown in Fig. 7 and 17) (for example comprise first signal generator; Shown in assembly 520), be configured to receiving inputted signal and generation and demagnetize first output signal that is associated and the second output signal that is associated with sampling at least at least.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition; This system comprises that sampling component (for example; Shown in assembly 522); Be configured at least the receiving inputted signal and the second output signal, come sampled input signal based on the information that joins with the second output signal correction at least, and generate at least with one or more and the 3rd export signals through what sample size was associated.In addition; This system (for example comprises first controller; Shown in assembly 542); Be used for adjusting at least output current, this first controller is configured to receive at least the first output signal and the 3rd output signal, and at least based on coming to generate at least first control signal with the information of the first output signal and the 3rd output signal correction couplet.In addition, this system comprises oscillator (for example, shown in assembly 562), is configured to receive at least first control signal and comes to generate at least clock signal based on the information that is associated with first control signal at least; And secondary signal maker (for example, shown in assembly 538), be configured to the receive clock signal and second control signal at least, and come to generate at least modulation signal based on the information that is associated with the clock signal and second control signal at least.In addition, this system comprises gate driver (for example, shown in assembly 546), is configured to receive at least modulation signal and exports to switch to major general's drive signal.For example, switch is configured to influence first electric current of the elementary winding that is coupled to secondary winding of flowing through.In addition; This system comprises the 3rd controller (for example, shown in assembly 540) that is used for adjusting at least peak current, is configured to receive at least sensing signal and threshold voltage; And second control signal is exported to secondary signal maker (for example, shown in assembly 538).For example, sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.Modulation signal is corresponding to switching frequency, and the first output signal is corresponding to the demagnetization pulse duration.
For example, switching frequency is inversely proportional to the demagnetization pulse duration, and switch periods is directly proportional with the pulse duration of demagnetizing, and output current and peak current are proportional.In another example, peak current is constant, and output current is constant.In another example, in the system (for example, shown in Fig. 7 and 17) of claim 12; First controller (for example; Shown in assembly 542) comprise voltage to current converter (for example, shown in assembly 1510), be configured to finish the 3rd output signal and claim second electric current; Phase-locked loop (for example, shown in assembly 1530) is configured to receive at least the first output signal and clock signal and generates the 3rd electric current; And definite assembly (for example; Shown in assembly 1520); Be configured to receive second electric current and the 3rd electric current, confirm second electric current and the 3rd electric current difference in size, and generate first control signal based on the information that is associated with second electric current and the 3rd electric current at least.
According to another embodiment, a kind of system (for example, shown in Fig. 7 and 20) that is used to adjust supply convertor comprises the controller (for example, shown in assembly 540) that is used for adjusting at least peak current.For example, controller is configured to receive at least sensing signal and first threshold signal and generates first control signal at least, and sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.In addition, this system comprises signal generator (for example, shown in assembly 538), is configured to receive at least first control signal and generates modulation signal at least; And gate driver (for example, shown in assembly 546), be configured to receive at least modulation signal and export to switch to major general's drive signal.For example, this switch is configured to influence first electric current.In another example; This controller (for example, shown in assembly 540) comprises first comparator (for example, shown in assembly 1810); Be configured to receive sensing signal and first threshold voltage, and generate comparison signal based on the information that is associated with sensing signal and first threshold voltage at least; And charge pump (for example, shown in assembly 1820), be configured to receive comparison signal and generate second control signal based on the information that is associated with comparison signal at least.In addition, this controller (for example, shown in assembly 540) comprises threshold value maker (for example, shown in assembly 1830), is configured to receive second control signal and generates second threshold voltage based on the information that is associated with second control signal at least; And second comparator (for example, shown in assembly 1840), be configured to receive second threshold voltage and sensing signal, and generate first control signal based on the information that is associated with second threshold voltage and sensing signal at least.
According to another embodiment; A kind of method that is used to adjust supply convertor (for example; Realize like Fig. 7) comprise by first signal generator (for example, shown in assembly 520) at least receiving inputted signal and at least based on the information that is associated with input signal to generate at least with demagnetize the first output signal that is associated and be associated with sampling second export signal.In addition; This method through sampling component (for example comprises; Shown in assembly 522) come at least the receiving inputted signal and the second output signal; At least come sampled input signal based on the information that joins with the second output signal correction, and generate at least with one or more and the 3rd export signals through what sample size was associated; Come to receive at least the 3rd output signal and first threshold voltage and generate the 4th at least through capacitor to export signal through error amplifier (for example, shown in assembly 524), this capacitor is coupled to this error amplifier.In addition, this method comprises through compensation assembly (for example, shown in assembly 532) to receive at least the 4th output signal and coming to generate at least compensating signal based on the information that joins with the 4th output signal correction at least.For example, input signal is the combination of the compensating signal and first sensing signal.In another example, first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and secondary winding is associated with the output current and the output voltage of this supply convertor.In addition; This method comprise through being used for adjusting at least output current first controller (for example; Shown in assembly 542) come to receive at least the first output signal and the 3rd output signal, and at least based on coming to generate at least first control signal with the information of the first output signal and the 3rd output signal correction couplet; Second controller through being used for adjusting at least output voltage (for example; Shown in assembly 534) come to receive at least the 4th output signal and come (for example to generate second control signal at least based on the information that joins with the 4th output signal correction at least; Shown in signal 558) and the 3rd control signal (for example, shown in signal 536).In addition, this method comprises through oscillator (for example, shown in assembly 562) to receive at least first control signal and second control signal and generating clock signal at least through this oscillator (for example, shown in assembly 562); Come at least receive clock signal, the 3rd control signal and the 4th control signal and generate modulation signal at least through secondary signal maker (for example, shown in assembly 538) through this secondary signal maker (for example, shown in assembly 538).In addition, this method comprises through gate driver (for example, shown in assembly 546) to receive at least modulation signal and exporting to switch with flow through first electric current of the elementary winding that is coupled to secondary winding of influence to major general's drive signal; The 3rd controller (for example, shown in assembly 540) through being used for adjusting at least peak current receives the 3rd control signal, second sensing signal and second threshold voltage, and the 4th control signal is exported to the secondary signal maker.For example, second sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.
In another example; This method through the feed forward assembly (for example also comprises; Shown in assembly 568) (for example receive from error amplifier; Shown in assembly 524) the 5th output signal, and come to second controller (for example, shown in assembly 534) output the 6th output signal based on the information that joins with the 5th output signal correction at least.In another example, when this method also is included in the 4th output signal in size greater than predetermined value output current is adjusted into the constant current level, and when the 4th exports signal in size less than predetermined value, output voltage is adjusted into constant voltage level.In another example; The processing that is used for sampled input signal is included in first demagnetization period sampled input signal when finishing or when finishing near the first demagnetization period; Generation and first is demagnetized the period corresponding first through sample size; Or sampled input signal when finishing near the second demagnetization period, and generate with second demagnetize that the period is associated second through sample size.First is one or more in sample size two through sample size and second through sample size.In another example, be used for generating at least the 3rd output Signal Processing and comprise that maintenance first only is generated as through sample size up to second through sample size.In another example; In this method (for example; Realize like Fig. 7 and 10) in, be used for generating at least and demagnetize the first output signal that is associated and comprise in the second output Signal Processing that sampling is associated and to receive the 3rd output signal, at least based on confirming the 3rd threshold voltage with the information of the 3rd output signal correction couplet; The 3rd threshold voltage and input signal are compared in size, and generate the first output signal based on the information that is associated with the 3rd threshold voltage and input signal at least.
According to another embodiment, a kind of method (for example, shown in Fig. 7 and 9) that is used to adjust supply convertor comprises through sampling component (for example, shown in assembly 522) comes receiving inputted signal at least.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition, this method comprises through sampling component (for example, shown in assembly 522) samples to input signal, generates at least and one or more first output signals that are associated through sample size; Come to receive at least first output signal and the threshold voltage and generate second through capacitor to export signal through error amplifier (for example, shown in assembly 524), this capacitor is coupled to this error amplifier.In addition, this method comprises that generating the 3rd through error amplifier exports signal; Receive the 3rd output signal through the feed forward assembly, and generate the 4th output signal based on information at least with the 3rd output signal correction couplet; Controller through being used for adjusting at least output voltage (for example; Shown in assembly 534) come to receive at least the second output signal and the 4th output signal, and at least based on coming to generate at least first control signal with the information of the second output signal and the 4th output signal correction couplet.In addition, this method comprises through signal generator (for example, shown in assembly 538) to receive at least first control signal and coming to generate at least modulation signal based on the information that is associated with first control signal at least; Come to receive at least modulation signal and export to first electric current that switch influences the elementary winding that is coupled to secondary winding of flowing through to major general's drive signal through gate driver (for example, shown in assembly 546).
For example, this method also comprise if the second output signal in size less than predetermined value then output voltage is adjusted into constant voltage level.In another example, this method comprises through compensation assembly (for example, shown in assembly 532) to receive at least the second output signal, and generates compensating signal based on the information with the second output signal correction couplet at least.The combination of compensating signal and sensing signal during input signal, and sensing signal is associated with first winding that is coupled to secondary winding at least.
According to another embodiment, a kind of method that is used to adjust supply convertor is for example by Fig. 7,14 (a) and 14 (b) or by shown in Fig. 7,15 (a) and 15 (b).This method through sampling component (for example comprises; Shown in assembly 522) come receiving inputted signal at least; By this sampling component (for example, shown in assembly 522) sampled input signal, and generate at least and one or more first output signals that are associated through sample size.In addition; This method through error amplifier (for example comprises; Shown in assembly 524) come to receive at least the first output signal with threshold voltage and come to export signal based on the information that is associated with the first output signal and threshold voltage at least through capacitor generation second; And generate the 3rd output signal based on the information that is associated with the first output signal and threshold voltage at least, this capacitor is coupled to this error amplifier.In addition, this method comprises that receiving the 3rd through feed forward assembly (for example, shown in assembly 568) exports signal, and generates the 4th output signal based on the information with the 3rd output signal correction couplet at least; Come to receive at least the second output signal and the 4th output signal through controller (for example, shown in assembly 534), and at least based on coming to generate at least control signal with the information of the second output signal and the 4th output signal correction couplet.In addition; This method through compensation assembly (for example comprises; Shown in assembly 532) come to receive at least the second output signal and come to generate at least compensating signal based on the information that joins with the second output signal correction at least, input signal is the combination of compensating signal and another signal.
For example, voltage signal during the second output signal, and compensating signal is a current signal.In another example; This method through signal generator (for example also comprises; Shown in assembly 538) receive control signal at least, come to generate at least modulation signal based on the information that is associated with control signal at least, (for example through gate driver; Shown in assembly 546) come to receive at least modulation signal, and export to switch with the flow through electric current of elementary winding of supply convertor of influence to major general's drive signal.
According to another embodiment, a kind of method (for example, realizing like Fig. 7 and 17) that is used to adjust supply convertor comprises through first signal generator (for example, shown in assembly 520) and comes receiving inputted signal at least.For example, input signal is associated with first winding of the secondary winding that is coupled to supply convertor at least, and secondary winding is relevant with the output current and the output voltage of supply convertor.In addition, this method comprises at least to generate at least and first output signal that is associated and the second output signal that is associated with sampling of demagnetizing based on the information that is associated with input signal; Through sampling component (for example; Shown in assembly 522) come at least the receiving inputted signal and the second output signal; At least come sampled input signal based on the information that joins with the second output signal correction, and generate at least with one or more and the 3rd export signals through what sample size was associated.In addition; This method comprise through being used for adjusting at least output current first controller (for example; Shown in assembly 542) come to receive at least the first output signal and the 3rd output signal, and at least based on coming to generate at least first control signal with the information of the first output signal and the 3rd output signal correction couplet; Come to receive at least first control signal and come to generate at least clock signal based on the information that is associated with first control signal at least through oscillator (for example, shown in assembly 562).In addition, this method comprises through secondary signal maker (for example, shown in assembly 538) comes the receive clock signal and second control signal at least, and comes to generate at least modulation signal based on the information that is associated with the clock signal and second control signal at least; Come to receive at least modulation signal and export to switch with flow through first electric current of the elementary winding that is coupled to secondary winding of influence to major general's drive signal through gate driver (for example, shown in assembly 546).In addition; This method comprise through being used for adjusting at least peak current the 3rd controller (for example; Shown in assembly 540) come to receive at least sensing signal and threshold voltage, and second control signal is exported to secondary signal maker (for example, shown in assembly 538).Sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through, and modulation signal is corresponding to switching frequency, and the first output signal is corresponding to the demagnetization pulse duration.
For example, switching frequency is inversely proportional to the demagnetization pulse duration, and output current is directly proportional with peak current.In another example, peak current is constant, and output current is constant.
In another example; For example by shown in Fig. 7 and 17, the processing that is used for generating at least first control signal comprises through voltage and receives the 3rd output signal to current converter (for example, shown in assembly 1510); At least generate second electric current based on information with the 3rd output signal correction couplet; Come to receive at least first output signal and the clock signal through phase-locked loop (for example, shown in assembly 1530), and generate the 3rd electric current based on the information that is associated with the first output signal and clock signal at least.In addition; The processing that is used for generating at least first control signal comprises through (for example confirming assembly; Shown in assembly 1520) receive second electric current and the 3rd electric current; And generate first control signal based on the information that is associated with second electric current and the 3rd electric current at least, this confirms that assembly is configured to confirm second electric current and the 3rd electric current difference in size.
According to another embodiment, a kind of method (for example, shown in Fig. 7 and 20) that is used to adjust supply convertor comprises that the controller (for example, shown in assembly 540) through being used for adjusting at least peak current to receive at least sensing signal and first threshold signal.For example, sensing signal is associated with first electric current of the elementary winding of the supply convertor of flowing through.In addition, this method comprises at least and comes to generate at least first control signal based on the information that is associated with sensing signal and first threshold voltage; Come to receive at least first control signal and come to generate at least modulation signal based on the information that is associated with first control signal at least through signal generator (for example, shown in assembly 538); Come to receive at least modulation signal and export to switch to influence first electric current to major general's drive signal through gate driver (for example, shown in assembly 546).The processing that is used for generating at least first control signal through first comparator (for example comprises; Shown in assembly 1810) receive sensing signal and first threshold voltage, and generate comparison signal based on the information that is associated with sensing signal and first threshold voltage at least; Receive comparison signal and generate second control signal based on the information that is associated with comparison signal at least through charge pump (for example, shown in assembly 1820); Passing threshold maker (for example, shown in assembly 1830) receives second control signal and generates second threshold voltage based on the information that is associated with second control signal at least; Receive second threshold voltage and sensing signal through second comparator ((for example, shown in assembly 1840)), and generate first control signal based on the information that is associated with second threshold voltage and sensing signal at least.
Compare with conventional art, obtained many benefits through the present invention.Some embodiment of the present invention can reduce the part counting and/or reduce system cost.Some embodiments of the present invention can improve reliability and/or efficient.Some embodiment of the present invention can simplify the circuit design in the switching mode flyback power supply converter.Some embodiments of the present invention provide primary side sensing and adjustment scheme.For example, primary side sensing and adjustment scheme can be improved the load adjustment.In another example, primary side sensing and adjustment scheme can compensate elementary winding inductance variation so that in the inverse excitation type converter that adopts the primary side adjustment, obtain constant output current.Some embodiment of the present invention can provide the constant output electric current that does not change along with the change of elementary winding inductance in the CC pattern.
With reference to equality 8, if N is a constant, in order to make I oKeep constant, also should make
Figure BSA00000443883900511
Keep constant.Because R sBe constant, therefore exist following method to make at least
Figure BSA00000443883900512
Keep constant:
(a) make V Cs_pkKeep constant and make
Figure BSA00000443883900513
Keep constant;
(B) the is kept constant and the
Figure BSA00000443883900515
remains constant; or
(c) make
Figure BSA00000443883900516
Keep constant and make T sKeep constant;
Some embodiment of the present invention uses top method (a) and (b) or (c) realizes constant current (CC) pattern, and wherein, output current is maintained at constant level, and no matter the inductance level of elementary winding, secondary winding and auxiliary winding and output voltage how.
Figure 21 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Power converting system 2100 comprises elementary winding 2110, secondary winding 2112, auxiliary winding 2114, resistor 2120,2122 and 2124; Switch 2130, demagnetization detection components 2150, current source 2160, current sink 2162; Switch 2164 and 2166, NOT (non-) door 2170, capacitor 2172; Comparator 2180 and 2182, trigger assembly 2190, and driven unit 2192.For example, demagnetization detection components 2150, current source 2160, current sink 2162, switch 2164 and 2166, NOT door 2170, capacitor 2172, comparator 2180 and 2182, trigger assembly 2190, and driven unit 2192 is positioned on the chip 2140.In another example, chip 2140 comprises terminal 2142,2144 and 2146 at least.In another example, system 2100 is switching mode flyback power supply transformation systems.
Stress that like top discussion and at this Figure 21 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, lead-edge-blanking (leading-edge blanking) assembly is inserted between terminal 2146 and the comparator 2180, and the lead-edge-blanking assembly that is inserted reception outputs to comparator 2180 from the signal of terminal 2146 and with signal 2147.
Figure 22 is the simplification diagrammatic sketch of conduct according to the demagnetization detection components 2150 of switched-mode power supply transformation system 2100 parts of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.This demagnetization detection components 2150 comprises comparator 2210, trigger assembly 2220 and 2222, NOT door 2230 and 2232, and AND door 2240.
Figure 23 is the simplified timing diagram according to the switched-mode power supply transformation system 2100 that comprises the demagnetization detection components 2150 shown in Figure 21 and 22 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 23, waveform 2310 expressions are as feedback signal 2143 (for example, the V of the function of time FB), waveform 2320 expressions are as the Demag signal 2151 of the function of time, and waveform 2330 expressions are as ramp signal 2165 (for example, the V of the function of time Ramp).In addition, waveform 2340 expressions are as the control signal 2185 of the function of time, and waveform 2350 expressions are as the drive signal 2193 of the function of time, and waveform 2360 expressions are as sensing signal 2147 (for example, the V of the function of time Cs).
Shown in Figure 21 and 23, when drive signal 2193 (corresponding to waveform 2350) when being logic high, switch 2130 conductings and therefore being closed.According to an embodiment, the electric current 2111 of the elementary winding 2110 of flowing through tilt to rise linearly, and signal 2147 (V for example Cs) also tilt to rise linearly.For example, signal 2147 (V for example Cs) receive by comparator 2180, comparator 2180 is gone back receive threshold signal 2181 (V for example Thoc).In another example, comparator 2180 is with signal 2147 (V for example Cs) with threshold signal 2181 (V for example Thoc) compare, and comparison signal 2187 is exported to trigger assembly 2190.In one embodiment, trigger assembly 2190 also receives the control signal 2185 from comparator 2182, and generates modulation signal 2191.In another embodiment, modulation signal 2191 is received by actuator assembly 2192, and as response, actuator assembly 2192 generates drive signal 2193.
Shown in waveform 2350 and 2360, if signal 2147 (V for example Cs) reach threshold signal 2181 (V for example in size Thoc), then drive signal 2193 becomes logic low from logic high, and switch 2130 by and therefore be disconnected.For example, when switch 2130 ended, the energy of being stored was sent the output to power converting system 2100, and beginning is handled in demagnetization.In another example, during demagnetization was handled, the electric current of the elementary winding 2112 of flowing through tilted to descend linearly.
Shown in figure 21, output voltage (for example, the V of auxiliary winding 2114 Aux) reflected output voltage (for example, the V of power converting system 2100 o), and converted into feedback signal 2143 (for example, V by resistor 2120 and 2122 FB).For example, feedback signal 2143 (for example, V FB) receive by the comparator 2210 as demagnetization detection components 2150 parts.In another example, comparator 2210 is with feedback signal 2143 (for example, V FB) (for example, 0.1V) compare with threshold signal 2211.
Shown in waveform 2310 and 2320, as feedback signal 2143 (for example, V FB) (for example, when 0.1V) above, Demag signal 2151 becomes logic high, the beginning that its indication demagnetization is handled to rise to threshold signal 2211.In addition, as feedback signal 2143 (for example, V FB) (for example, when 0.1V) following, Demag signal 2151 becomes logic low, the end that its indication demagnetization is handled to drop to threshold signal 2211.For example, when the electric current of the secondary winding 2112 of flowing through drops to when almost nil, the demagnetization processing finishes.In another example, after the demagnetization processing finished, power converting system 2100 got into the resonance oscillations state, and feedback signal 2143 (for example, V FB) (corresponding to waveform 2310) be approximately sinusoidal wave.
Shown in figure 21, Demag signal 2151 is received by switch 2166 and NOT door 2170, and NOT door 2170 is exported to switch 2164 as response with signal 2171.For example, if Demag signal 2151 is a logic high, then switch 2164 breaks off and switch 2166 closures.Therefore, according to an embodiment, capacitor 2172 is discharged through current sink 2162, and ramp signal 2165 (for example, V Ramp) descend linearly.In another example, if Demag signal 2151 is a logic low, then switch 2164 closures and switch 2166 break off.Therefore, according to another embodiment, capacitor 2172 is recharged through current source 2160, and ramp signal 2165 (for example, V Ramp) rise linearly.
According to another embodiment, ramp signal 2165 (for example, V Ramp) receive by comparator 2182, comparator 2182 is gone back receive threshold signal 2183 (for example, V Ref).For example, comparator 2182 is with ramp signal 2165 (for example, V Ramp) and threshold signal 2183 (for example, V Ref) compare, and to trigger assembly 2190 output control signals 2185.Shown in waveform 2330 and 2350, if ramp signal 2165 (for example, V Ramp) reach threshold signal 2183 (for example, V in size Ref), then drive signal 2193 becomes logic high from logic low, and switch 2130 conductings.
Like Figure 21, shown in 22 and 23, for example, the switch periods of power converting system 2100 is following:
T s = I 2 + I 1 I 1 × T Demag - - - ( 29 )
Wherein, T sExpression switch periods, and T DemagThe duration that the expression demagnetization is handled.I 2The size of the charging current of expression current source 2160, and I 1The size of the discharging current of expression current sink 2162.
In one embodiment, if
V cs_pk＝V thoc (30)
Then I p = V Thoc R s - - - ( 31 )
Wherein, V Cs_pkExpression signal 2147 (V for example Cs) peak value, and V ThocThe size of expression threshold signal 2181.In addition, I pExpression the flow through peak value of electric current 2111 of elementary winding 2110 and R sThe resistance value of expression resistor 2124.In another embodiment, suppose that the efficient between elementary winding 2110 and the secondary winding 2112 is 100%, then output current is:
I o = 1 2 × N × I p × T Demag T s - - - ( 32 )
Wherein, I oThe expression output current, and N representes the turn ratio between elementary winding 2110 and the secondary winding 2112.Utilize equality 29 and 31, equality 32 becomes:
I o = 1 2 × I 1 I 0 + I 1 × V thoc R s - - - ( 33 )
For example, based on equality 33, because I 1, I 2, V ThocAnd R sBe constant, so output current I oBe constant.In another example, power converting system 2100 intentions make V Cs_pkWith
Figure BSA00000443883900545
Both keep constant, so that make output current I oKeep constant.
Figure 24 is the simplification diagrammatic sketch that has the switched-mode power supply transformation system of primary side sensing and adjustment according to another embodiment of the present invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Switched-mode power supply transformation system 2400 comprises following assembly:
● be used to generate the assembly 2420 of Demag signal and Sampling_clk signal;
● be used to sample and keep the assembly 2422 of one or more signals;
● be used to generate the assembly 2438 of PWM/PFM modulation signal;
● be used for the assembly 2440 of current sense (CS) peak value adjustment;
● be used to generate the assembly 2446 of gate drive signal;
● oscillator 2462;
● voltage is to current converter 2510;
● be used for confirming the assembly 2520 of two input signals difference in size;
● Clock dividers 2610;
● pulse copy circuit 2620; And
● phase detectors and charge pump 2635.
In one embodiment, assembly 2420,2422,2438,2440 and 2446, oscillator 2462; Voltage is to current converter 2510, assembly 2520, Clock dividers 2610; Pulse copy circuit 2620, and phase detectors and charge pump 2635 are positioned on the chip 2490.For example, chip 2490 comprises terminal 2416,2452 and 2466 at least.
Although the one group of assembly that is used for system 2400 that top utilization is selected illustrates, however can also exist manyly substitute, modification and variant.For example, some in the assembly can be expanded and/or make up.In another example, the lead-edge-blanking assembly is inserted between terminal 2466 and the assembly 2440, and the lead-edge-blanking assembly that is inserted reception is exported to assembly 2440 from the signal of terminal 2466 and with signal 2464.Depend on embodiment, the arrangement of assembly can be exchanged with other assembly that is replaced.The further details of these assemblies can find in this manual.
For example, switched-mode power supply transformation system 2400 is identical with switched-mode power supply transformation system 500.In another example, chip 2490 is identical with chip 590.In another example, terminal 2416,2452 is identical with terminal 516,552 and 566 respectively with 2466.
In another example, assembly 2420,2422,2438,2440 is identical with assembly 520,522,538,540 and 546 respectively with 2446, and oscillator 2462 is identical with oscillator 562.In another example, voltage is identical to current converter 1510 with voltage to current converter 2510, and assembly 2520 is identical with assembly 1520.In another example, Clock dividers 2610 and pulse copy circuit 2620 is identical with pulse copy circuit 1620 with Clock dividers 1610 respectively, and phase detectors comprise phase detectors 1630 and charge pump 1640 with charge pump 2635.Return with reference to Figure 17 and 18, according to an embodiment, assembly 542 comprises voltage to current converter 1510, assembly 1520 and phase-locked loop 1530, and phase-locked loop 1530 comprises pulse copy circuit 1620, phase detectors 1630 and charge pump 1640 at least.
In another example, signal 2414,2444,2448,2460,2464 is identical with signal 514,544,548,560,564 and 574 respectively with 2474.In another example, signal 2512 is identical with signal 1512 and 1522 respectively with 2522.In another example, signal 2612,2614,2629,2644 is identical with signal 1612,1614,1629,1644 and 1660 with 2660.
Figure 25 is the simplification diagrammatic sketch that illustrates as according to some equipment of the assembly 2440 that is used for the adjustment of current sense (CS) peak value of the part of the switched-mode power supply transformation system 2400 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.Shown in figure 25, assembly 2440 comprises high-speed comparator 2710, logic control assembly 2722, charge pump 2724, dynamic threshold maker 2730 and overcurrent protection (OCP) comparator 2740.
For example, assembly 2440 comprises high-speed comparator 2710, dynamic threshold maker 2730 and overcurrent protection (OCP) comparator 2740 identical with high-speed comparator 1810, dynamic threshold maker 1830 and overcurrent protection (OCP) comparator 1840.In another example, logic control assembly 2722 forms charge pump 1820 with charge pump 2724.In another example, signal 2464 is identical with signal 564 and 574 respectively with 2474.In another example, signal 2712,2726 is identical with signal 1812,1826 and 1835 respectively with 2735.
Return Figure 24, according to an embodiment, switched-mode power supply transformation system 2400 is flyback power supply converters.In another embodiment, switched-mode power supply transformation system 2400 comprises the one or more assemblies that are used for the control switch frequency, and is used for the one or more assemblies of control flows through the peak current of elementary winding.For example, peak current is adjusted to predetermined level, and route of pipe line ac input voltage is not how.
According to another embodiment, the output voltage of switched-mode power supply transformation system 2400 is by signal 2414 (for example, the V through terminal 2416 (for example, terminal FB) FB) expression.For example, signal 2414 (for example, V FB) by assembly 2422 samplings and maintenance, the output V of assembly 2422 SampReceive to current converter 2510 by voltage.In another example, voltage generates signal 2522 to current converter 2510 with assembly 2520, the frequency of the signal 2660 that signal 2522 is used for confirming that oscillator 2462 generates.
According to another embodiment, signal 2414 (for example, V FB) receive by assembly 2420.For example, assembly 2420 is to pulse copy circuit 2620 output Demag signals, and duration (for example, the T of Demag signal indication demagnetization processing Demag).In another example, signal is handled by a phase-locked loop, and this phase-locked loop comprises oscillator 2462, Clock dividers 2610, pulse copy circuit 2620, phase detectors and charge pump 2635 and assembly 2520.In another example, the frequency of oscillation of this phase-locked loop conditioning signal 2660, so that
F sw = 1 β × T Demag - - - ( 34 )
Wherein, β is a constant.In another example, β equals 2.
Figure 26 is the simplified timing diagram according to the switched-mode power supply transformation system 2400 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 26, (for example, CLK2), and waveform 2682 expressions as the signal 2614 of the function of time (for example, CLK4) as the signal 2612 of the function of time in waveform 2680 expression.In addition, waveform 2684 expressions are as the Demag signal of the function of time, and waveform 2686 expressions are as the signal 2629 of the function of time, and waveform 2688 expressions are as the signal 2522 of the function of time.
For example, at the falling edge of signal 2614 (corresponding to waveform 2682), Demag signal (corresponding to waveform 2684) is synchronized to signal 2629 (corresponding to waveform 2686).In another example, at the falling edge of signal 2629 (corresponding to waveform 2686), signal 2612 (corresponding to waveform 2680) is sampled.
According to an embodiment, if the value of sampling out from signal 2612 corresponding to logic low, duration (for example, the T that handles of demagnetization then Demag) less than the half period of signal 2612 (corresponding to waveform 2680).According to another embodiment, as response, signal 2522 (corresponding to waveform 2688) reduces in size, thereby causes the frequency of signal 2612 (corresponding to waveform 2680) also to reduce.
Figure 25 and/or Figure 20 show one or more implementations of peak current that are used to adjust elementary winding according to some embodiment.For example, in constant current (CC) pattern, the voltage that senses (for example, V Cs) peak value be adjusted to predetermined level through feedback, and route of pipe line ac input voltage and/or time of delay is not how.
In another example, shown in figure 25, when mains switch (for example, switch 550) just ends, signal 2464 (for example, V Cs) by comparator 2710 and predetermined threshold signal value (for example, V Th_oc) compare.According to an embodiment, comparator 2710 output signals 2712, so that conditioning signal 2735 (for example, signal OCP_ref), signal 2735 is used as the threshold voltage of comparator 2740.According to another embodiment, the voltage that senses (for example, V Cs) peak value be adjusted to predetermined level (for example, V through such feedback Th_oc), constant so that the output current of switched-mode power supply transformation system 2400 keeps.
Figure 27 be according to certain embodiments of the invention respectively as switched-mode power supply transformation system 500 or the assembly 540 that is used for current sense (CS) peak value adjustment of 2400 parts or 2440 simplified timing diagram.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
With reference to Figure 27 and 20, according to an embodiment, (for example, CLK), and waveform 2782 expressions as the signal 564 of the function of time (for example, CS) as the signal 560 of the function of time in waveform 2780 expression.According to another embodiment, waveform 2784 expression is as the signal LEB_b of the function of time, and waveform 2786 expressions as the signal 1812 of the function of time (for example, OCP_det).According to another embodiment; Waveform 2790 expression as the function of time, as signal Charge_con_b and signal Charge and the result's of (AND) signal (for example; UP); And waveform 2792 expression as the function of time, as signal Charge_con and signal Charge_b with the result signal (for example, DOWN).For example, signal Charge and signal Charge_b are short pulse signals.According to another embodiment, waveform 2794 expressions are as signal 1826 (for example, the V of the function of time Control), and waveform represent to do 2796 for the signal 1835 of the function of time (for example, OCP_ref).
Shown in figure 27, according to an embodiment, (for example, 0.9V), then signal 1812 (corresponding to waveform 2786) is a logic low, and signal 1835 (corresponding to waveform 2796) progressively increases if the peak value of signal 564 (corresponding to waveform 2782) is less than Vth_oc.According to another embodiment; If signal 564 (corresponding to waveform 2782) greater than Vth_oc (for example became during a period; 0.9V), then signal 1812 (corresponding to waveform 2786) is a logic high during this same period, and signal 1835 (corresponding to waveform 2796) progressively reduces; So that dynamically at predetermined level (for example, V Th_oc) locate to obtain sensing voltage (for example, V Cs) constant peak value.
Figure 28 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Power converting system 2800 comprises elementary winding 2810, secondary winding 2812, auxiliary winding 2814, resistor 2820,2822 and 2824; Switch 2830, slope maker 2832, trsanscondutance amplifier 2834, Cycle by Cycle (cycle-by-cycle) peak value maker 2836; Lead-edge-blanking assembly 2838, demagnetization detection components 2850, current source 2860, current sink 2862; Switch 2864 and 2866, NOT (non-) door 2870, capacitor 2872 and 2858; Comparator 2880 and 2882, trigger assembly 2890, and driven unit 2892.
For example, slope maker 2832, trsanscondutance amplifier 2834, Cycle by Cycle peak value maker 2836, lead-edge-blanking assembly 2838, demagnetization detection components 2850, current source 2860, current sink 2862, switch 2864 and 2866, NOT door 2870, capacitor 2872, comparator 2880 and 2882, trigger assembly 2890 and driven unit 2892 are positioned on the chip 2840.In another example, chip 2840 comprises terminal 2842,2844,2846 and 2848 at least.In another example, system 2800 is switching mode flyback power supply transformation systems.In another example, demagnetization detection components 2850 is identical with demagnetization detection components 2150 shown in figure 22.
Figure 29 is the simplified timing diagram according to the switched-mode power supply transformation system 2800 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 29, waveform 2910 expressions are as input signal 2813 (for example, the V of the function of time In), waveform 2920 expressions are as ramp signal 2833 (for example, the V of the function of time B), and waveform 2922 expression is as the signal 2881 of the function of time (for example, CMP).In addition, waveform 2930 expressions are as sensing signal 2847 (for example, the V of the function of time Cs), and waveform 2940 expressions are as peak signal 2837 (for example, the V of the function of time C2).
In addition, waveform 2950 expressions are as feedback signal 2843 (for example, the V of the function of time FB), and waveform 2960 expression is as the Demag signal 2851 of the function of time, and waveform 2970 expressions are as another ramp signal 2865 (for example, V of the function of time A).In addition, waveform 2980 expressions are as the control signal 2885 of the function of time, and waveform 2990 expressions are as the drive signal 2893 of the function of time.
Shown in Figure 28 and 29, when drive signal 2893 (corresponding to waveform 2990) when being logic high, switch 2830 conductings.According to an embodiment, the electric current 2811 of the elementary winding 2810 of flowing through tilts to rise linearly, and signal 2847 (for example, V Cs) also tilt to rise linearly through lead-edge-blanking assembly 2838.For example, signal 2847 (for example, V Cs) receive by Cycle by Cycle peak detector 2836, detector 2836 detects the peak value and the output peak signal 2837 (corresponding to waveform 2940) of the signal 2847 in each switch periods, the peak value of the detected signal 2847 of peak signal 2837 expressions.In another example, peak signal 2837 (for example, V C2) receive by trsanscondutance amplifier 2834, trsanscondutance amplifier 2834 also receives reference signal 2835 (V for example Ref2).
According to an embodiment, peak signal 2837 (for example, V C2) with reference signal 2835 (V for example Ref2) between voltage difference be exaggerated and be converted into current signal, this current signal and then converted into voltage signal 2881 (for example, CMP) by capacitor 2858.According to another embodiment, voltage signal 2881 (corresponding to waveform 2922) is received by comparator 2880, and comparator 2880 also receives ramp signal 2833 (corresponding to waveform 2920).
For example, (for example, CMP) size is along with the time is constant for voltage signal 2881.In another example, comparator 2880 is compared voltage signal 2881 (corresponding to waveform 2922) with ramp signal 2833 (corresponding to waveform 2920), and to trigger assembly 2890 output comparison signals 2887.In one embodiment, trigger assembly 2890 also receives control signal 2885 and the generation modulation signal 2891 from comparator 2882.In another embodiment, modulation signal 2891 is received by actuator assembly 2892, and as response, actuator assembly 2892 generates drive signal 2893.
Shown in waveform 2920 and 2990, if ramp signal 2833 (for example, V B) (for example, CMP), then drive signal 2893 becomes logic low and switch 2830 ends from logic high to reach voltage signal 2881.For example, when switch 2830 ended, institute's stored energy was delivered to the output and the demagnetization of power converting system 2800 and handles beginning.In another example, during demagnetization was handled, the electric current of the secondary winding 2812 of flowing through tilted to descend linearly.
Shown in figure 28, output voltage (for example, the V of auxiliary winding 2814 Aux) reflection power converting system 2800 output voltage (for example, V o), and converted into feedback signal 2843 (for example, V by resistor 2820 and 2822 FB).For example, feedback signal 2843 (for example, V FB) receive by demagnetization detection components 2850, assembly 2850 is with feedback signal 2843 (for example, V FB) (for example, 0.1V) compare with threshold signal.
According to an embodiment, shown in waveform 2950 and 2960, as feedback signal 2843 (for example, V FB) (for example, when 0.1V) above, Demag signal 2851 becomes logic high, the beginning that its indication demagnetization is handled to rise to threshold signal.According to another embodiment, as feedback signal 2843 (for example, V FB) (for example, when 0.1V) following, Demag signal 2851 becomes logic low, the end that its indication demagnetization is handled to drop to threshold signal.For example, when the electric current of the secondary winding 2812 of flowing through drops to when almost nil, the demagnetization processing finishes.In another example, after the demagnetization processing finished, power converting system 2800 got into the resonance oscillations state, and feedback signal 2843 (for example, V FB) (corresponding to waveform 2310) be approximately sinusoidal wave.
Shown in figure 28, Demag signal 2851 is received by switch 2866 and NOT door 2870, and NOT door 2870 is exported to switch 2864 as response with signal 2871.For example, if Demag signal 2851 is a logic high, then switch 2864 breaks off and switch 2866 closures.Therefore, according to an embodiment, capacitor 2872 is discharged through current sink 2862, and ramp signal 2865 (for example, V A) descend linearly.In another example, if Demag signal 2851 is a logic low, then switch 2864 closures and switch 2866 break off.Therefore, according to another embodiment, capacitor 2872 is recharged through current source 2860, and ramp signal 2865 (for example, V A) rise linearly.
According to another embodiment, ramp signal 2865 (for example, V A) receive by comparator 2882, comparator 2882 is gone back receive threshold signal 2883 (for example, V Ref1).For example, comparator 2882 is with ramp signal 2865 (for example, V A) and threshold signal 2883 (for example, V Ref1) compare, and to trigger assembly 2890 output control signals 2885.Shown in waveform 2970 and 2990, if ramp signal 2865 (for example, V A) reach threshold signal 2883 (for example, V in size Ref1), then drive signal 2893 becomes logic high from logic low, and switch 2830 conductings.
Figure 30 is the simplification diagrammatic sketch of conduct according to the Cycle by Cycle peak value maker 2836 of power converting system 2800 parts of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
In one embodiment, Cycle by Cycle peak value maker 2836 comprises comparator 3010, switch 3020,3022 and 3024, buffer 3030, capacitor 3040 and 3042, current source 3050, and monostable maker 3060.In another embodiment, switch 3022 and 3024 is respectively by signal 3062 and 3064 controls, and signal 3062 and 3064 is that monostable maker 3060 generates in response to drive signal 2893.For example, signal 3062 and 3064 each monostable signal that have the 300ns pulsewidth naturally.
Figure 31 is the simplified timing diagram of conduct according to the Cycle by Cycle peak value maker 2836 of power converting system 2800 parts of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 31, waveform 3110 expressions are as the drive signal 2893 of the function of time, and waveform 3120 expressions are as sensing signal 2847 (for example, the V of the function of time Cs).In addition, waveform 3130 expressions are as the monostable signal 3062 of the function of time, and waveform 3140 expressions are as the monostable signal 3064 of the function of time.In addition, waveform 3150 expressions are as signal 3023 (for example, the V of the function of time C1), and waveform 3160 expressions are as the signal 3031 of the function of time.In addition, waveform 3180 expressions are as peak signal 2837 (for example, the V of the function of time C2).
Shown in Figure 30 and 31, monostable maker 3060 receives drive signal 2893 (corresponding to waveform 3110), and generates monostable signal 3062 (corresponding to waveforms 3130) in response to the rising edge of drive signal 2893.For example, monostable signal 3062 has the pulsewidth of 300ns.In another example, when monostable signal 3062 was logic high, switch 3022 was closed; Therefore, capacitor 3040 is dropped to logic low by discharge and signal 3023 (corresponding to waveform 3150).
In another example, signal 3023 (corresponding to waveform 3150) is received by comparator 3010, and comparator 3010 is compared signal 3023 with signal 2847 (corresponding to waveform 3120).According to an embodiment, if signal 2847 in size greater than signal 3023, then switch 3020 closures and capacitor 3022 are recharged through current source 3050.According to another embodiment, if signal 3023 reaches signal 2847 in size, then switch 3020 breaks off; Therefore, the peak value of signal 3023 expression signal 2874 in the corresponding signal period, up to switch 3022 next pulse through monostable signal 3022 by till the closure once more.According to another embodiment, signal 3023 is received by buffer 3030, and buffer 3030 generates signal 3031 (corresponding to waveform 3160).
According to another embodiment, monostable maker 3060 receives drive signal 2893 (corresponding to waveform 3110), and generates monostable signal 3064 (corresponding to waveforms 3140) in response to the trailing edge of drive signal 2893.For example, monostable signal 3064 has the pulsewidth of 300ns.In another example, when monostable signal 3064 was logic high, switch 3024 was closed; Therefore, capacitor 3042 is recharged and signal 2837 (corresponding to waveform 3170) is used to signal 3031 sampling.In another example, the signal 3031 of warp sampling is maintained on the capacitor 3042 and as signal 2837 to be exported, and the peak value of the signal 2874 of signal 2837 expression corresponding signals in the cycle is till next pulse of drive signal 2844 arrives.
With reference to Figure 28, for example, the switch periods of power converting system 2800 is following:
T s = I 2 + I 1 I 1 × T Demag - - - ( 35 )
Wherein, T sExpression switch periods, and T DemagThe duration that the expression demagnetization is handled.I 2The size of the charging current of expression current source 2860, and I 1The size of the discharging current of expression current sink 2862.
According to an embodiment, AC input signal 2815 is converted into input signal 2813 (for example, the V through rectification In), as follows:
V in = | 2 × V rms × sin ( 2 π T AC × t ) | - - - ( 36 )
Wherein, V InExpression is through the input signal 2813 of rectification.In addition, V RmsThe root mean square size of expression AC input signal 2815, and T ACThe cycle of expression AC input signal 2815.For example, T ACEqual 20ms.
In another example, therefore, peak signal 2837 does
V c 2 = | 2 × V rms × sin ( 2 π T AC × t ) | L p × t on × R s - - - ( 37 )
Wherein, V C2Expression peak signal 2837.In addition, t OnThe pulsewidth of expression drive signal 2893, and R sThe resistance value of expression resistor 2824.In addition, L pThe inductance of representing elementary winding 2810.
In another example, shown in figure 28, peak signal 2837 quilts are average and make the mean value of peak signal 2837 equal reference signal 2835.According to an embodiment, if
g m 2 &pi; &times; C cmp < 1 K &times; T AC - - - ( 38 )
Then, V Ref 2 = V Cs _ Ave = 1 T &times; &Integral; 0 T V c 2 Dt = 1 T &times; &Integral; 0 T V Cs _ Pk Dt - - - ( 39 )
Wherein, g mBe the transconductance value of trsanscondutance amplifier 2834, and C CmpIt is the capacitance of capacitor 2858.In addition, T representes integration period, and K is the positive integer much larger than 1.For example, T is equal to or greater than T ACIn another example, K is not less than 3.In another example, K equals 3,5, and 6,10 or 20.In another example, the bandwidth of trsanscondutance amplifier 2834 is much smaller than the frequency of AC input signal 2815.In addition, V Cs_aveThe mean value of expression peak signal 2837, and V Ref2Expression reference signal 2835.In addition, V Cs_pkThe peak value of expression signal 2847, it for example equals V C2
According to another embodiment, shown in figure 28,
I o = 1 2 &times; N &times; 1 T &times; &Integral; 0 T V cs _ pk R s &times; T Demag T s dt - - - ( 40 )
Wherein, I 0The output current of expression switched-mode power supply transformation system 2800, and N representes the turn ratio between elementary winding 2810 and the secondary winding 2812.In addition, R sThe resistance value of expression resistor 2824, and T sThe switch periods of expression power converting system 2800.In addition, T DemagRepresent the duration that the demagnetization in each switch periods is handled.
According to another embodiment,, can obtain following formula with equality 35 and 39 and equality 40 combination:
I 0 = 1 2 &times; N &times; 1 R s &times; I 1 I 2 + I 1 &times; V ref 2 - - - ( 41 )
For example, based on equality 41, because I 1, I 2, V Ref2, R sWith N all be constant, so output current I oBe constant.In another example, power converting system 2800 makes
Figure BSA00000443883900645
With
Figure BSA00000443883900646
Keep constant, so that make output current I oKeep constant.In one embodiment, make
Figure BSA00000443883900647
through satisfying equality 38 at least and keep constant.In another embodiment, make
Figure BSA00000443883900648
through satisfying equality 35 at least and keep constant.
Stress that like top discussion and at this Figure 28 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 2800 comprises the one or more large value capacitors that are used for AC input signal 2815 is converted into the DC signal that is received by elementary winding 2810, and is shown in figure 32.
Figure 32 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
For example, also comprise capacitor 3210 and 3220, resistor 3230 except power converting system 3200 and the inductor 3240, power converting system 3200 is identical with power converting system 2800.In another example, capacitor 3210 and 3220, resistor 3230 and inductor 3240 are used for converting AC input signal 3215 into DC input signal 3213 (for example, V In).
According to an embodiment, the advantage of power converting system 2800 is to need not to use one or more large value capacitors and convert the AC input signal into by elementary winding 2810 receptions DC input signal.According to another embodiment, however, power converting system 2800 can utilize one or more such large value capacitors to operate, and is shown in figure 32.
Figure 33 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Power converting system 3300 comprises elementary winding 3310, secondary winding 3312, auxiliary winding 3314, resistor 3320,3322 and 3324; Switch 3330, trsanscondutance amplifier 3334, Cycle by Cycle peak value maker 3336, lead-edge-blanking assembly 3338; Demagnetization detection components 3350, oscillator 3360, AND door 3366, capacitor 3358; Integrator 3370, comparator 3382, trigger assembly 3390 and driven unit 3392.
For example, trsanscondutance amplifier 3334, Cycle by Cycle peak value maker 3336, lead-edge-blanking assembly 3338, demagnetization detection components 3350, oscillator 3360, AND door 3366, integrator 3370, comparator 3382, trigger assembly 3390 and driven unit 3392 are positioned on the chip 3340.In another example, chip 3340 comprises terminal 3342,3344,3346 and 3348 at least.In another example, system 3300 is switching mode flyback power supply transformation systems.In another example, demagnetization detection components 3350 is identical with demagnetization detection components 2150 shown in figure 22.In another example, Cycle by Cycle peak value maker 3336 is identical with Cycle by Cycle peak value maker 2836 shown in figure 30.In another example, integrator 3370 is Cycle by Cycle integrators that (when for example, the demagnetization processing in each switch periods finishes) is reset after each switch periods.
Figure 34 is the simplification diagrammatic sketch of conduct according to the integrator 3370 of power converting system 3300 parts of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
In one embodiment, integrator 3370 comprises switch 3420,3422 and 3424, capacitor 3440 and 3442, transistor 3450,3452 and 3454, amplifier 3460, monostable maker 3460 and 3462, and resistor 3470.In another embodiment, switch 3320 is by 3351 controls of Demag signal.In another embodiment, switch 3422 and 3424 is respectively by signal 3461 and 3463 controls.For example, signal 3461 is generated in response to drive signal 3393 by monostable maker 3460.In another example, signal 3463 is generated in response to Demag signal 3351 by monostable maker 3462.
Figure 35 is the simplified timing diagram according to the switched-mode power supply transformation system 3300 that comprises the integrator 3370 shown in Figure 33 and 34 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 35, waveform 3510 expressions are as the drive signal 3393 of the function of time, and waveform 3520 expressions are as sensing signal 3347 (for example, the V of the function of time Cs), and waveform 3530 expressions are as peak signal 3337 (for example, the V of the function of time C2).In addition, waveform 3540 expressions are as the monostable signal 3461 of the function of time, and waveform 3550 expressions are as the monostable signal 3463 of the function of time.In addition, waveform 3560 expressions are as the Demag signal 3351 of the function of time.In addition, waveform 3570 expressions are as the signal 3423 of the function of time, and waveform 3580 expressions are as the signal 3372 of the function of time.
Shown in Figure 34 and 35, monostable maker 3460 receives drive signals 3393 (corresponding to waveform 3510) and generates signal 3461 (corresponding to waveform 3540) in response to the rising edge of drive signal 3393.For example, signal 3461 is monostable signals.In another example, when monostable signal 3461 was logic high, switch 3422 was closed; Therefore, capacitor 3440 is dropped to logic low by discharge and signal 3423 (corresponding to waveform 3570).
According to an embodiment, when Demag signal 3351 (corresponding to waveform 3560) when being logic high, switch 3420 closures.According to another embodiment; Peak signal 3337 (corresponding to waveform 3530) is received by amplifier 3460; Amplifier 3460 will convert current signal into as the peak signal 3337 of voltage signal; When switch 3420 was closed through Demag signal 3351, this current signal was used for to capacitor 3440 chargings.For example, capacitor 3440 output signals 3423 (corresponding to waveform 3570).In another example, signal 3423 is received by buffer 3030, and buffer 3030 generates signal 3431.
According to another embodiment, monostable maker 3462 receives Demag signal 3351 (corresponding to waveforms 3560), and generates signal 3463 (corresponding to waveform 3550) in response to the trailing edge of Demag signal 3351.For example, signal 3463 is monostable signals.In another example, when monostable signal 3463 was logic high, switch 3424 was closed; Therefore, capacitor 3442 is recharged and signal 3372 (corresponding to waveform 3580) is used to signal 3431 sampling.In another example, through sampled signal 3431 be maintained on the capacitor 3442 and as signal 3372 by output till next pulse of drive signal 3344 arrives.
According to another embodiment, signal 3372 does
V c 4 = &Integral; 0 T Demag V c 2 R 3 &times; 1 C 3 dt = V c 2 &times; T Demag R 3 &times; C 3 - - - ( 42 )
Wherein, V C4Expression signal 3372, and V C2Expression peak signal 3337.In addition, T DemagRepresent the duration that the demagnetization in each switch periods is handled.In addition, R 3The resistance value of expression resistor 3470, and C 3The capacitance of expression capacitor 3440.
Figure 36 is the simplification diagrammatic sketch of conduct according to the oscillator 3360 of power converting system 3300 parts of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
In one embodiment, oscillator 3360 comprises resistor 3640 and capacitor 3650 at least.In another embodiment, oscillator 3360 receives reference signal 3610,3620 and 3630, and generates clock signal 3362 and ramp signal 3364.In another embodiment, the cycle of clock signal 3362 and ramp signal 3364 is confirmed by following formula:
T osc = 2 &times; R 5 &times; C 5 &times; V ref 2 - V ref 3 V ref 1 - - - ( 43 )
Wherein, T OscThe cycle of expression clock signal 3362 and ramp signal 3364.In addition, V Ref1, V Ref2And V Ref3Represent reference signal 3610,3620 and 3630 respectively.In addition, R 5The resistance value of expression resistor 3640, and C 5The capacitance of expression capacitor 3650.
In another embodiment, the switch periods of power converting system 3300 equals the cycle of clock signal 3362 and ramp signal 3364, and switching frequency is confirmed as as follows:
F sw = V ref 1 2 &times; R 5 &times; C 5 &times; ( V ref 2 - V ref 3 ) - - - ( 44 )
Wherein, F SwThe switching frequency of expression power converting system 3300.For example, power converting system 3300 is with fixing switching frequency operation.
Figure 37 is the simplified timing diagram according to the switched-mode power supply transformation system 3300 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 37, waveform 3710 expressions are as input signal 3313 (for example, the V of the function of time In), and waveform 3720 expressions are as the drive signal 3393 of the function of time.In addition, waveform 3730 expression is as the clock signal 3362 of the function of time, and waveform 3740 expressions are as the ramp signal 3364 of the function of time, and waveform 3742 expressions as the signal 3381 of the function of time (for example, CMP).In addition, waveform 3750 expressions are as sensing signal 3347 (for example, the V of the function of time Cs), and waveform 3760 expressions are as peak signal 3337 (for example, the V of the function of time C2).In addition, waveform 3770 expressions are as the Demag signal 3351 of the function of time, and waveform 3780 expressions are as the signal 3372 of the function of time.
Shown in Figure 33 and 37, at the rising edge place of signal 3362 (corresponding to waveform 3730), drive signal 3393 (corresponding to waveform 3720) becomes logic high and switch 3330 conductings.According to an embodiment, the electric current 3311 of the elementary winding 3310 of flowing through tilts to rise linearly, and signal 3347 (for example, V Cs) also tilt to rise linearly through lead-edge-blanking assembly 3338.For example, signal 3347 (for example, V Cs) receive by Cycle by Cycle peak detector 3336, detector 3336 detects the peak value and the output peak signal 3337 (corresponding to waveform 3760) of the signal 3347 in each switch periods, the peak value of the detected signal 3347 of peak signal 3337 expressions.In another example, peak signal 3337 (for example, V C2) receive by integrator 3370, integrator 3370 also receives drive signal 3393 (corresponding to waveform 3720) and Demag signal 3351 (corresponding to waveform 3770), and to trsanscondutance amplifier 3334 output signals 3372 (corresponding to waveform 3780).
According to an embodiment, trsanscondutance amplifier 3334 also receives reference signal 3335 (V for example Ref), and as response, with signal 3372 (for example, V C4) with reference signal 3335 (V for example Ref) between voltage difference amplify and convert current signal into, this current signal and then converted into voltage signal 3381 (for example, CMP) by capacitor 3358.According to another embodiment, voltage signal 3381 (corresponding to waveform 3742) is received by comparator 3382, and comparator 3382 also receives ramp signal 3364 (corresponding to waveform 3740).
For example, (for example, CMP) size is along with the time is constant for voltage signal 3381.In another example, comparator 3382 is compared voltage signal 3381 (corresponding to waveform 3742) with ramp signal 3364 (corresponding to waveform 3740), and to trigger assembly 3390 output comparison signals 3385.In one embodiment, trigger assembly 3390 also receives the clock signal 3362 from oscillator 3360 at least, and generates signal 3391.In another embodiment, signal 3391 is received by AND door 3366, and AND door 3366 is gone back receive clock signal 3362 and generated modulation signal 3368.In another embodiment, actuator assembly 3392 receives modulation signal 3368, and generates drive signal 3393.
Shown in waveform 3720,3740 and 3742, (for example, CMP), then drive signal 3393 becomes logic low and switch 3330 ends from logic high if ramp signal 3364 reaches voltage signal 3381.For example, when switch 3330 ended, institute's stored energy was delivered to the output and the demagnetization of power converting system 3300 and handles beginning.In another example, during demagnetization was handled, the electric current of the secondary winding 3312 of flowing through tilted to descend linearly.
Shown in figure 33, output voltage (for example, the V of auxiliary winding 3314 Aux) reflection power converting system 3300 output voltage (for example, V o), and converted into feedback signal 3343 (for example, V by resistor 3320 and 3322 FB).For example, feedback signal 3343 (for example, V FB) receive by demagnetization detection components 3350, assembly 3350 is with feedback signal 3343 (for example, V FB) (for example, 0.1V) compare with threshold signal.
According to an embodiment, as feedback signal 3343 (for example, V FB) (for example, when 0.1V) above, Demag signal 3351 becomes logic high, and beginning that its indication demagnetization is handled is shown in waveform 3770 to rise to threshold signal.According to another embodiment, as feedback signal 3343 (for example, V FB) (for example, when 0.1V) following, Demag signal 3351 becomes logic low, the end that its indication demagnetization is handled to drop to threshold signal.For example, when the electric current of the secondary winding 3312 of flowing through drops to when almost nil, the demagnetization processing finishes.In another example, after the demagnetization processing finished, power converting system 3300 got into the resonance oscillations state, and feedback signal 3343 (for example, V FB) be approximately sinusoidal wave.According to another embodiment, shown in waveform 3720 and 3730, at next rising edge place of clock signal 3362, drive signal 3393 becomes logic high and switch 3330 conducting once more once more.
In one embodiment, AC input signal 3315 is converted into input signal 3313 (for example, the V through rectification In), as follows:
V in = | 2 &times; V rms &times; sin ( 2 &pi; T AC &times; t ) | - - - ( 45 )
Wherein, V InExpression is through the input signal 3313 of rectification.In addition, V RmsThe root mean square size of expression AC input signal 3315, and T ACThe cycle of expression AC input signal 3315.For example, T ACEqual 20ms.
In another example, peak signal 3337 does
V c 2 = V in L p &times; t on &times; R s - - - ( 46 )
Wherein, V C2Expression peak signal 3337.In addition, t OnThe pulsewidth of expression drive signal 3393, and R sThe resistance value of expression resistor 3324.In addition, L pThe inductance of representing elementary winding 3310.
In another example, based on equality 42, signal 3372 equals
V c 4 = V c 2 &times; T Demag R 3 &times; C 3 = V cs _ pk &times; T Demag R 3 &times; C 3 - - - ( 47 )
Wherein, V C4Expression signal 3372, and T DemagRepresent the duration that the demagnetization in each switch periods is handled.In addition, R 3The resistance value of expression resistor 3470, and C 3The capacitance of expression capacitor 3440.In addition, V Cs_pkThe peak value of expression signal 3347, it for example equals V C2
In another example, shown in figure 33, signal 3372 quilts are average and make the mean value of signal 3372 equal reference signal 3335.According to an embodiment, if
g m 2 &pi; &times; C cmp < 1 K &times; T AC - - - ( 48 )
Then, V Ref = V c 4 _ Ave = 1 T &times; &Integral; 0 T V c 4 Dt - - - ( 49 )
Wherein, g mBe the transconductance value of trsanscondutance amplifier 3334, and C CmpIt is the capacitance of capacitor 3358.In addition, T representes integration period, and K is the positive integer much larger than 1.For example, T is equal to or greater than T ACIn another example, K is not less than 3.In another example, K equals 3,5,6,10 or 20.In another example, the bandwidth of trsanscondutance amplifier 3334 is much smaller than the frequency of AC input signal 3315.In addition, V C4_aveThe mean value of expression signal 3372, and V Ref Expression reference signal 3335.
According to another embodiment, combination equality 47 and 49 can obtain following formula:
1 T &times; &Integral; 0 T V cs pk &times; T Demag dt = R 3 &times; C 3 &times; V ref - - - ( 50 )
According to another embodiment, based on equality 44, power converting system 3300 is with the fixed switching frequency operation, then
I o = 1 2 &times; N &times; 1 T &times; &Integral; 0 T V cs _ pk R s &times; T Demag T s dt = N 2 &times; R s &times; T s &times; 1 T &times; &Integral; 0 T V cs _ pk &times; T Demag dt - - - ( 51 )
Wherein, I 0The output current of expression switched-mode power supply transformation system 3300, and N representes the turn ratio between elementary winding 3310 and the secondary winding 3312.In addition, R sThe resistance value of expression resistor 3324, it is a constant.In addition, T sThe switch periods of expression power converting system 3300, it is to equal 1/F SwConstant.
According to another embodiment,, can obtain following formula with equality 44 and 50 and equality 51 combination:
I 0 = 1 2 &times; N &times; 1 R s &times; 1 2 &times; R 5 &times; C 5 &times; V ref 1 V ref 2 - V ref 3 &times; R 3 &times; C 3 &times; V ref - - - ( 52 )
If K 0 = R 3 &times; C 3 2 &times; R 5 &times; C 5 &times; V Ref 1 V Ref 2 - V Ref 3 - - - ( 53 )
Then I 0 = 1 2 &times; N &times; 1 R s &times; K 0 &times; V Ref - - - ( 54 )
For example, based on equality 54, because K 0, V Ref, R sWith N all be constant, so output current I oBe constant.In another example, power converting system 3300 intentions make
Figure BSA00000443883900716
And T sKeep constant, so that make output current I oKeep constant.In one embodiment, make
Figure BSA00000443883900717
through satisfying equality 48 at least and keep constant.In another embodiment, make T through satisfying equality 44 at least sKeep constant.
Shown in figure 33, in one embodiment, through rectification input voltage 3313 (for example, V In) confirm by following formula
V in = | 2 &times; V rms &times; sin ( 2 &pi; T AC &times; t ) | - - - ( 55 )
In another embodiment, the flow through peak value of electric current 3311 of elementary winding 3310 is confirmed by following formula
I p = V in L p &times; t on - - - ( 56 )
Wherein, I pThe peak value of expression electric current 3311, and L pThe inductance of representing elementary winding 3310.In addition, t OnThe pulsewidth of expression drive signal 3393.
Figure 38 is the simplified timing diagram according to some electric current of the switched-mode power supply transformation system 3300 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
For example, waveform 3810 expression is as the electric current 3311 of the function of time, and waveform 3820 expressions as the function of time through rectification input current 3317 (for example, I In).In another example, through rectification input current 3317 (for example, I In) corresponding to shown in figure 33 through rectification input voltage 3313 (for example, V In).
Shown in figure 38, in one embodiment, through rectification input current 3317 (for example, I In) do
I in = ( 1 2 &times; I p &times; t on ) / T s - - - ( 57 )
Wherein, I InExpression is through rectification input current 3317.In another embodiment, combination equality 56 and equality 57 can obtain:
I in = V in &times; t on 2 2 &times; L p &times; T s - - - ( 58 )
In another embodiment,
t on = 1 2 &times; V cmp - V ref 3 V ref 2 - V ref 3 - - - ( 59 )
Wherein, V CmpExpression signal 3381.In addition, V Ref2And V Ref3It is the constant of representing reference signal 3620 and 3630 respectively.For example, based on equality 59, if satisfy equality 48, then t OnIn at least one cycle of AC input signal 3315 is constant, and therefore, V CmpIn at least one cycle of AC input signal 3315 is constant.
If M = t On 2 2 &times; L p &times; T s - - - ( 60 )
Then, according to equality 58,
I in＝M×V in
(61)
According to an embodiment, shown in figure 38, based on equality 44, the switch periods T of power converting system 3300 sBe constant; Therefore, M also is a positive integer at least one cycle of AC input signal 3315, and the power factor of power converting system 3300 (PF) equals 1 or be substantially equal to 1.For example, the power factor of power converting system 3300 (PF) is equal to or greater than 0.9.According to another embodiment, through satisfying equality 44 and 48 at least, the power factor of power converting system 3300 (PF) approaches 1.
Stress that like top discussion and at this Figure 33 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 3300 comprises the one or more large value capacitors that are used for AC input signal 3315 is converted into the DC signal that is received by elementary winding 3310, and is shown in figure 39.
Figure 39 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
For example, also comprise capacitor 3910 and 3920, resistor 3930 except power converting system 3900 and the inductor 3940, power converting system 3900 is identical with power converting system 3300.In another example, capacitor 3910 and 3920, resistor 3930 and inductor 3940 are used for converting AC input signal 3915 into DC input signal 3913 (for example, V In).
With reference to Figure 33 and 39, according to an embodiment, power converting system 3900 can equal 1 or be substantially equal to obtain under 1 the situation constant output current in power factor.For example, the power factor of power converting system 3900 (PF) is equal to or greater than 0.9.According to another embodiment, power converting system 3300 is used to one or more light-emitting diodes power is provided, and is shown in figure 40.
Figure 40 is the simplification diagrammatic sketch to the switched-mode power supply transformation system 3300 of led powered that is used for according to further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 3300 is used to one or more light-emitting diodes 4010 power is provided.
Figure 41 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Power converting system 4100 comprises elementary winding 4110, secondary winding 4112, auxiliary winding 4114, resistor 4120,4122,4124,4126 and 4128; Switch 4130, trsanscondutance amplifier 4134, Cycle by Cycle peak value maker 4136, lead-edge-blanking assembly 4138; Demagnetization detection components 4150, oscillator 4160, AND door 4166, capacitor 4158; Integrator 4170, comparator 4182, multiplier 4184, trigger assembly 4190 and driven unit 4192.
For example, trsanscondutance amplifier 4134, Cycle by Cycle peak value maker 4136, lead-edge-blanking assembly 4138, demagnetization detection components 4150, oscillator 4160, AND door 4166, integrator 4170, comparator 4182, multiplier 4184, trigger assembly 4190 and driven unit 4192 are positioned on the chip 4140.In another example, chip 4140 comprises terminal 4142,4144,4146,4148 and 4149 at least.In another example, system 4100 is switching mode flyback power supply transformation systems.
In another example, demagnetization detection components 4150 is identical with demagnetization detection components 2150 shown in figure 22.In another example, Cycle by Cycle peak value maker 4136 is identical with Cycle by Cycle peak value maker 2836 shown in figure 30.In another example, integrator 4170 is identical with integrator 3370 shown in figure 34.In another example, oscillator 4160 is identical with oscillator 3360 shown in figure 36.In another example, integrator 4170 is Cycle by Cycle integrators that (when for example, the demagnetization processing in each switch periods finishes) is reset after each switch periods.
Figure 42 is the simplified timing diagram according to the switched-mode power supply transformation system 4100 of the embodiment of the invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Shown in figure 42, waveform 4210 expressions are as input signal 4113 (for example, the V of the function of time In), and waveform 4220 expression is as the drive signal 4193 of the function of time, and waveform 4230 expressions are as the clock signal 4162 of the function of time.In addition, waveform 4240 expression as the function of time 4183 (for example, MULT), and waveform 4242 expressions as the signal 4181 of the function of time (for example, CMP).In addition, waveform 4250 expressions are as sensing signal 4147 (for example, the V of the function of time Cs), and waveform 4260 expressions are as peak signal 4137 (for example, the V of the function of time C2), and waveform 4262 expressions are as the signal 4185 of the function of time.In addition, waveform 4270 expressions are as the Demag signal 4151 of the function of time, and waveform 4280 expressions are as the signal 4172 of the function of time.
Shown in Figure 41 and 42, at the rising edge place of signal 4162 (corresponding to waveform 4230), drive signal 4193 (corresponding to waveform 4220) becomes logic high and switch 4130 conductings.According to an embodiment, the electric current 4111 of the elementary winding 4110 of flowing through tilts to rise linearly, and signal 4147 (for example, V Cs) also tilt to rise linearly through lead-edge-blanking assembly 4138.For example, signal 4147 (for example, V Cs) receive by Cycle by Cycle peak detector 4136, detector 4136 detects the peak value and the output peak signal 4137 (corresponding to waveform 4260) of the signal 4147 in each switch periods, the peak value of the detected signal 4147 of peak signal 4137 expressions.In another example, peak signal 4137 (for example, V C2) receive by integrator 4170, integrator 4170 also receives drive signal 4193 (corresponding to waveform 4220) and Demag signal 4151 (corresponding to waveform 4270), and to trsanscondutance amplifier 4134 output signals 4172 (corresponding to waveform 4280).
According to an embodiment, trsanscondutance amplifier 4134 also receives reference signal 4135 (V for example Ref), and as response, with signal 4172 (for example, V C4) with reference signal 4135 (V for example Ref) between voltage difference amplify and convert current signal into, this current signal and then converted into voltage signal 4181 (for example, CMP) by capacitor 4158.For example, voltage signal 4181 is (for example, CMP) in size along with the time is constant.In another example, voltage signal 4181 (corresponding to waveform 4242) is received by multiplier 4184, and multiplier 4184 also receives signal 4183 (corresponding to waveform 4240).In another example, signal 4183 through resistor 4126 and 4128 and with input signal 4113 (for example, V In) proportional.
According to another embodiment, to comparator 4182 output signals 4185 (corresponding to waveform 4262), comparator 4182 also receives sensing signal 4147 (corresponding to waveform 4250) to multiplier 4184 as response.For example, comparator 4182 is compared signal 4185 (corresponding to waveform 4262) with sensing signal 4147 (corresponding to waveform 4250), and to trigger assembly 4190 output comparison signals 4187.In one embodiment, trigger assembly 4190 also receives the clock signal 4162 from oscillator 4160 at least, and generates signal 4191.In another embodiment, signal 4191 is received by AND door 4166, and AND door 4166 is gone back receive clock signal 4162 and generated modulation signal 4168.In another embodiment, actuator assembly 4192 receives modulation signal 4168, and generates drive signal 4193.
Shown in waveform 4220,4250 and 4262, if signal 4147 reaches signal 4185, then drive signal 4193 becomes logic low and switch 4130 ends from logic high.For example, when switch 4130 ended, institute's stored energy was delivered to the output and the demagnetization of power converting system 4100 and handles beginning.In another example, during demagnetization was handled, the electric current of the secondary winding 4112 of flowing through tilted to descend linearly.
Shown in figure 41, output voltage (for example, the V of auxiliary winding 4114 Aux) reflection power converting system 4100 output voltage (for example, V o), and converted into feedback signal 4143 (for example, V by resistor 4120 and 4122 FB).For example, feedback signal 4143 (for example, V FB) receive by demagnetization detection components 4150, assembly 4150 is with feedback signal 4143 (for example, V FB) (for example, 0.1V) compare with threshold signal.
According to an embodiment, as feedback signal 4143 (for example, V FB) (for example, when 0.1V) above, Demag signal 4151 becomes logic high, and beginning that its indication demagnetization is handled is shown in waveform 4270 to rise to threshold signal.According to another embodiment, as feedback signal 4143 (for example, V FB) (for example, when 0.1V) following, Demag signal 4151 becomes logic low, the end that its indication demagnetization is handled to drop to threshold signal.For example, when the electric current of the secondary winding 4112 of flowing through drops to when almost nil, the demagnetization processing finishes.In another example, after the demagnetization processing finished, power converting system 4100 got into the resonance oscillations state, and feedback signal 4143 (for example, V FB) be approximately sinusoidal wave.According to another embodiment, shown in waveform 4220 and 4230, at next rising edge place of clock signal 4162, drive signal 4193 becomes logic high and switch 4130 conducting once more once more.
In one embodiment, shown in figure 41, output current does
I 0 = 1 2 &times; N &times; 1 R s &times; K 0 &times; V ref - - - ( 62 )
Wherein, I 0The output current of expression switched-mode power supply transformation system 4100.In addition, N is the constant of the turn ratio between elementary winding 4110 of expression and the secondary winding 4112.In addition, R sThe resistance value of expression resistor 4124, and V RefExpression reference signal 4135, R sAnd V RefAll be constant.In addition, K 0It is constant.
For example, in order to obtain equality 62, power converting system 4100 is operated with fixed switching frequency, and
g m 2 &pi; &times; C cmp < 1 K &times; T AC - - - ( 63 )
Wherein, g mBe the transconductance value of trsanscondutance amplifier 4134, and C CmpIt is the capacitance of capacitor 4158.In addition, T ACThe cycle of expression AC input signal 4115, and K is the positive integer much larger than 1.For example, K is not less than 3.In another example, K equals 3,5,6,10 or 20.In another example, the bandwidth of trsanscondutance amplifier 4134 is much smaller than the frequency of AC input signal 4115.
In another example, based on equality 62, because K 0, V Ref, R sWith N all be constant, so output current I oBe constant.In another example, power converting system 4100 intentions make
Figure BSA00000443883900771
And T sKeep constant, so that make output current I oKeep constant.I representes integration period.For example, T is equal to or greater than T ACIn one embodiment, make
Figure BSA00000443883900772
through satisfying equality 63 at least and keep constant.In another embodiment, make T through oscillator 3360 sKeep constant.
Shown in figure 41, in one embodiment, signal 4185 is confirmed as as follows:
V cs _ pk = V mp = a &times; V cmp &times; V mult = a &times; V cmp &times; ( R 4 R 3 + R 4 &times; V in ) - - - ( 64 )
Wherein, V Cs_pkThe peak value of expression sensing signal 4147, and V MpExpression signal 4185.In addition, α is the constant coefficients of multiplier 4184.In addition, V CmpExpression signal 4181, and V MultExpression signal 4183.In addition, R 3And R 4The resistance value of representing resistor 4126 and 4128 respectively, and V InExpression is through rectification input voltage 4113.
In another example, the peak value of sensing signal 4147 does
V cs _ pk = V in L p &times; t on &times; R s - - - ( 65 )
Wherein, t OnThe pulsewidth of expression drive signal 4193, and R sThe resistance value of expression resistor 4124.In addition, L pThe inductance of representing elementary winding 4110.
Combination equality 64 and 65 can obtain following formula:
t on = a &times; V cmp &times; R 4 R 3 + R 4 &times; L p R s - - - ( 66 )
For example, based on equality 66, if satisfy equality 63, then t OnIn at least one cycle of AC input signal 4115 is constant, and therefore, V CmpIn at least one cycle of AC input signal 4115 is constant.
In another example, shown in figure 41, and through rectification input voltage 4113 (for example, V In) corresponding through rectification input current 4117 (for example, I In) do
I in = V in &times; t on 2 2 &times; L p &times; T s - - - ( 67 )
Wherein, I InExpression is through rectification input current 4117, and T sThe switch periods of expression power converting system 4100.
If M = t On 2 2 &times; L p &times; T s - - - ( 68 )
Then, according to equality 67,
I in＝M×V in
(69)
According to an embodiment, shown in figure 41, the switch periods T of power converting system 4100 sBe constant, and t OnIn at least one cycle of AC input signal 4115 is constant; Therefore, M also is a positive integer at least one cycle of AC input signal 4115, and the power factor of power converting system 4100 (PF) equals 1 or be substantially equal to 1.For example, the power factor of power converting system 4100 (PF) is equal to or greater than 0.9.According to another embodiment, through making switching frequency keep constant at least and satisfying equality 63, the power factor of power converting system 4100 (PF) equals 1 and perhaps is substantially equal to 1.
Stress that like top discussion and at this Figure 41 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 4100 comprises the one or more large value capacitors that are used for AC input signal 4115 is converted into the DC signal that is received by elementary winding 4110.
With reference to Figure 41, according to an embodiment, power converting system 4100 can equal 1 or be substantially equal to obtain under 1 the situation constant output current in power factor.According to another embodiment, power converting system 4100 is used to one or more light-emitting diodes power is provided, and is shown in figure 43.
Figure 43 is the simplification diagrammatic sketch to the switched-mode power supply transformation system 4100 of led powered that is used for according to further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 4100 is used to one or more light-emitting diodes 4310 power is provided.
Figure 44 is the simplification diagrammatic sketch according to the switched-mode power supply transformation system with primary side sensing and adjustment of further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.
Power converting system 4400 comprises elementary winding 4410, secondary winding 4412, auxiliary winding 4414, resistor 4420,4422 and 4424, switch 4126; Amplifier 4128, switch 4430, trsanscondutance amplifier 4434, Cycle by Cycle peak value maker 4436, lead-edge-blanking assembly 4438; Demagnetization detection components 4450, oscillator 4460, AND door 4466, capacitor 4458; Integrator 4470, comparator 4482, multiplier 4484, trigger assembly 4490 and driven unit 4492.
For example, trsanscondutance amplifier 4434, Cycle by Cycle peak value maker 4436, lead-edge-blanking assembly 4438, demagnetization detection components 4450, oscillator 4460, AND door 4466, integrator 4470, comparator 4482, multiplier 4484, trigger assembly 4490 and driven unit 4492 are positioned on the chip 4440.In another example, chip 4440 comprises terminal 4442,4444,4446 and 4448 at least.In another example, system 4400 is switching mode flyback power supply transformation systems.In another example, integrator 4470 is Cycle by Cycle integrators that (when for example, the demagnetization processing in each switch periods finishes) is reset after each switch periods.
According to an embodiment, elementary winding 4410, secondary winding 4412, auxiliary winding 4414, resistor 4420,4422 and 4424; Switch 4430, trsanscondutance amplifier 4434, Cycle by Cycle peak value maker 4436, lead-edge-blanking assembly 4438, demagnetization detection components 4450; Oscillator 4460, AND door 4466, capacitor 4458, integrator 4470, comparator 4482; Trigger assembly 4490 and driven unit 4492 are identical with following assembly respectively: elementary winding 4110, secondary winding 4112, auxiliary winding 4114, resistor 4120,4122 and 4124, switch 4130; Trsanscondutance amplifier 4134, Cycle by Cycle peak value maker 4136, lead-edge-blanking assembly 4138, demagnetization detection components 4150, oscillator 4160; AND door 4166, capacitor 4158, integrator 4170, comparator 4182, trigger assembly 4190 and driven unit 4192.
According to another embodiment, switch 4493 is by drive signal 4493 controls.For example, if drive signal 4493 is a logic high, switch 4493 closures then.In another embodiment, when switch 4493 closures, feedback signal 4443 (for example, V FB) be clamped to ground level through amplifier 4428 (for example, operational amplifier).In another example, feedback signal 4443 (for example, V FB) be set to zero, and current signal 4483 is confirmed by following formula
I FB = V aux R 1 = ( N aux N p &times; V in ) / R 1 &Proportional; V in - - - ( 70 )
Wherein, I FBExpression current signal 4483.In addition, V InExpression is through rectification input voltage 4413, and V AuxExpression boost voltage 4419.In addition, N AuxBe the number of turn of auxiliary winding 4414, and N pIt is the number of turn of elementary winding 4410.In addition, R 1The resistance value of expression resistor 4420.
In another example, based on equality 70, current signal 4483 is with proportional through rectification input voltage 4413, as follows:
I FB∝V in (71)
According to another embodiment, current signal 4483 is received by multiplier 4484, and multiplier 4484 also receives voltage signal 4481 and exports signals 4485 to comparator 4482.For example, signal 4485 is confirmed by following formula:
V mo＝b×V cmp×I FB (72)
Wherein, V MoExpression signal 4485.In addition, V Cmp Expression voltage signal 4481, and b is the constant coefficients of multiplier 4484.
In another example, can find out equality 72 and equality 64 are combined, signal 4485 and signal 4185 similar and with voltage signal 4481 and long-pending proportional through rectification input voltage 4413, as follows:
V mo∝V cmp×V in (73)
According to an embodiment, power converting system 4400 intentions make
Figure BSA00000443883900801
And T sKeep constant, so that make output current I oKeep constant.For example, make
Figure BSA00000443883900802
through satisfying equality 63 at least and keep constant.In another example, make T through oscillator 4460 sKeep constant.
According to another embodiment, shown in equality 73 at least, through making switching frequency keep constant at least and satisfying equality 63, the power factor of power converting system 4400 (PF) equals 1 and perhaps is substantially equal to 1.For example, the power factor of power converting system 4400 (PF) is equal to or greater than 0.9.
Stress that like top discussion and at this Figure 44 only is an example, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 4400 comprises the one or more large value capacitors that are used for AC input signal 4415 is converted into the DC signal that is received by elementary winding 4410.
With reference to Figure 44, according to an embodiment, power converting system 4400 can equal 1 or be substantially equal to obtain under 1 the situation constant output current in power factor.According to another embodiment, power converting system 4400 is used to one or more light-emitting diodes power is provided, and is shown in figure 45.
Figure 45 is the simplification diagrammatic sketch to the switched-mode power supply transformation system 4400 of led powered that is used for according to further embodiment of this invention.This diagrammatic sketch only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that many variants, replacement and modification.For example, power converting system 4400 is used to one or more light-emitting diodes 4510 power is provided.
According to another embodiment, a kind of system's (for example, shown in figure 21) that is used to adjust supply convertor comprising: first signal generator (for example, shown in assembly 2150) is configured to receive first sensing signal and generates the output signal that is associated with demagnetization.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this system comprises ramp signal maker (for example, shown in the combination of assembly 2170,2160,2162,2164,2166 and 2172), is configured to receive said output signal and generates ramp signal (for example, shown in signal 2165); And first comparator (for example; Shown in assembly 2182); Be configured to receive said ramp signal and first threshold signal (for example, shown in signal 2183), and generate first comparison signal based on information at least with said ramp signal and said first threshold signal correction couplet.In addition, this system comprises second comparator (for example, shown in assembly 2180), is configured to receive second sensing signal (for example, shown in signal 2147) and second threshold signal and generates second comparison signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises secondary signal maker (for example, shown in assembly 2190), is configured to receive at least said first comparison signal and said second comparison signal and generates modulation signal (for example, shown in signal 2191); And gate driver (for example, shown in assembly 2192), be configured to receive said modulation signal and to switch output drive signal (for example, shown in signal 2193).Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said output signal and demagnetization duration (for example, T Demag) be associated, and said drive signal and switch periods (for example, T s) be associated.This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant.
According to another embodiment, a kind of method (for example, realizing like Figure 21) that is used to adjust supply convertor comprises reception first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises at least based on the information generation output signal that is associated with said first sensing signal.Said output signal is associated with demagnetization.In addition, this method comprises the said output signal of reception; At least generate ramp signal based on information with said output signal correction couplet; Receive said ramp signal and first threshold signal; Handle the information that joins with said ramp signal and said first threshold signal correction; At least generate first comparison signal based on information with said ramp signal and said first threshold signal correction couplet.In addition, this method comprises reception second sensing signal and second threshold signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said second sensing signal and said second threshold signal of handling; At least generate second comparison signal based on the information that is associated with said second sensing signal and said second threshold signal; Receive said first comparison signal and said second comparison signal; Handle the information that is associated with said first comparison signal and said second comparison signal; At least generate modulation signal based on the information that is associated with said first comparison signal and said second comparison signal.In addition, this method comprises the said modulation signal of reception; At least come to the switch output drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.Make the said demagnetization duration and the ratio of said switch periods keep constant.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Like Fig. 7 or shown in Figure 24) (for example comprise first signal generator; Shown in assembly 520 or assembly 2420), be configured to receiving inputted signal at least and generate at least and the output signal that demagnetizes and be associated, said input signal is associated with the output current of supply convertor at least.In addition; This system (for example comprises first controller; Like assembly 542 or shown in the combination of assembly 2510,2520,2620 and 2635), be configured to receive at least said output signal, and at least based on coming to generate at least first control signal with the information of said output signal correction couplet; Second controller (for example, shown in assembly 540 or assembly 2440) is configured to receive first sensing signal and first threshold signal and generates second control signal.Said first sensing signal is associated with first electric current of the elementary winding of the said supply convertor of flowing through.In addition, this system comprises oscillator (for example, shown in assembly 562 or assembly 2462), is configured to receive at least said first control signal, and comes to generate at least clock signal based on the information that is associated with said first control signal at least; Secondary signal maker (for example, shown in assembly 538 or assembly 2438) is configured to receive at least said clock signal and said second control signal, and generates modulation signal at least.In addition, this system comprises gate driver (for example, shown in assembly 546 or assembly 2446), is configured to receive at least said modulation signal and to switch output drive signal at least.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said output signal and demagnetization duration (for example, T Demag) be associated, and said drive signal and switch periods (for example, T s) be associated.This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant, and makes the peak value of said first sensing signal keep constant in size.
According to another embodiment, a kind of method that is used to adjust supply convertor (for example, realizing like Fig. 7 or Figure 24) comprising: receiving inputted signal at least, and come to generate at least the output signal based on the information that is associated with said input signal at least.Said input signal is relevant with the output current of supply convertor at least, and said output signal is relevant with demagnetization.In addition, this method comprises and receives said output signal at least; Handle the information that joins with said output signal correction; At least based on coming to generate at least clock signal with the information of said output signal correction couplet.In addition, this method comprises reception sensing signal and threshold signal.Said sensing signal is associated with first electric current of the elementary winding of the said supply convertor of flowing through.In addition, this method comprises the information that is associated with said sensing signal and said threshold signal of handling; At least generate control signal based on the information that is associated with said sensing signal and said threshold signal; At least receive said clock signal and said control signal; Handle the information that is associated with said clock signal and said control signal; At least come to generate at least modulation signal based on the information that is associated with said clock signal and said control signal.In addition, this method comprises and receives said modulation signal at least; At least based on the information that is associated with said modulation intelligence to switch output drive signal at least, with flow through said first electric current of said elementary winding of influence.Said output signal was associated with the demagnetization duration, and said drive signal is associated with switch periods.Make the said demagnetization duration and the ratio of said switch periods keep constant, and make the peak value of said first sensing signal keep constant in size.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Shown in Figure 28 or 32) comprise first signal generator (for example, shown in assembly 2850), be configured to receive first sensing signal and generate the first output signal that is associated with demagnetization.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition; This system (for example comprises the first ramp signal maker; Shown in the combination of assembly 2860,2862,2864,2866,2870 and 2872), be configured to receive the said first output signal and generate first ramp signal (for example, shown in signal 2865); First comparator (for example; Shown in assembly 2882); (for example be configured to receive said first ramp signal and first threshold signal; Shown in signal 2883), and generate first comparison signal (for example, shown in signal 2885) based on information at least with said first ramp signal and said first threshold signal correction couplet.In addition, this system comprises peak detector (for example, shown in assembly 2836); (for example be configured to receive drive signal; Shown in signal 2893) and second sensing signal (for example, shown in signal 2847) and generation peak signal (for example, shown in signal 2837).Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition; This system comprises that amplifier (for example; Shown in assembly 2834), be configured to receive the said peak signal and second threshold signal (for example, shown in signal 2835) and (for example generate the second output signal through capacitor; Shown in signal 2881), said capacitor is coupled to said amplifier; Second comparator (for example, shown in assembly 2880) is configured to receive said second output signal and second ramp signal (for example, shown in signal 2833), and generates second comparison signal (for example, shown in signal 2887).In addition, this system comprises secondary signal maker (for example, shown in assembly 2890), is configured to receive at least said first comparison signal and said second comparison signal, and generates modulation signal (for example, shown in signal 2891); And gate driver (for example, shown in assembly 2892), be configured to receive said modulation signal and export said drive signal to said peak detector and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method that is used to adjust supply convertor (for example, realizing like Figure 28 or Figure 32) comprises and receives first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises that generating first based on the information that is associated with said first sensing signal at least exports signal; Receive the said first output signal; At least generate first ramp signal based on information with the said first output signal correction couplet.The said first output signal is relevant with demagnetization.In addition, this method comprises said first ramp signal of reception and first threshold signal; Handle the information that joins with said first ramp signal and said first threshold signal correction; At least generate first comparison signal based on information with said first ramp signal and said first threshold signal correction couplet; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said drive signal and said second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal; Receive the said peak signal and second threshold signal; Handle the information that is associated with said peak signal and said second threshold signal; At least generate the second output signal based on the information that is associated with said peak signal and said second threshold signal.In addition, this method comprises that receiving said second exports the signal and second ramp signal; Handle the information that is associated with said second output signal and said second ramp signal; At least generate second comparison signal based on the information that is associated with said second output signal and said second ramp signal.In addition, this method comprises said first comparison signal of reception and said second comparison signal; Handle the information that is associated with said first comparison signal and said second comparison signal; At least generate modulation signal based on the information that is associated with said first comparison signal and said second comparison signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Shown in Figure 28 or 32) (for example comprise first signal generator; Shown in assembly 2850), be configured to receive first sensing signal and generate the output signal (for example, shown in signal 2851) that is associated with demagnetization.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector (for example, shown in assembly 2836), is configured to receive the drive signal and second sensing signal and generates peak signal (for example, shown in signal 2837).Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition; This system comprises secondary signal maker (for example, shown in assembly 2890), be configured to handle at least with said output signal (for example; Shown in signal 2851) and said peak signal is (for example; Shown in signal 2837) information that is associated, and generate modulation signal (for example, shown in signal 2891).In addition, this system comprises gate driver (for example, shown in assembly 2892), is configured to receive said modulation signal and exports said drive signal to said peak detector and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said output signal and demagnetization duration (for example, T Demag) be associated, and said drive signal and switch periods (for example, T s) be associated.This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant; And the mean size that makes said peak signal (for example, keeps constant during T) in first duration.
According to another embodiment, a kind of method (for example, realizing like Figure 28 or 32) that is used to adjust supply convertor comprises reception first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises at least based on the information generation output signal that is associated with said first sensing signal; Receive the drive signal and second sensing signal; And the information that processing is associated with the drive signal and second sensing signal.First sensing signal is associated with demagnetization, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises at least based on the information generation peak signal that is associated with said drive signal and said second sensing signal; At least handle the information that is associated with said output signal and said peak signal; At least generate modulation signal based on the information that is associated with said output signal and said peak signal.In addition, this method comprises the said modulation signal of reception; At least export said drive signal based on the information that is associated with said modulation signal to switch, to influence said first electric current of the said elementary winding of flowing through at least.Said output signal and demagnetization duration (for example, T Demag) be associated, and said drive signal and switch periods (for example, T s) be associated.Make the said demagnetization duration and the ratio of said switch periods keep constant; And the mean size that makes said peak signal (for example, keeps constant during T) in first duration.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Like Figure 33, Figure 39 or shown in Figure 40) comprise first signal generator (for example, shown in assembly 3350), be configured to receive first sensing signal and generate the first output signal that is associated with demagnetization.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this system comprises peak detector (for example, shown in assembly 3336); (for example be configured to receive drive signal; Shown in signal 3393) and second sensing signal (for example, shown in signal 3347) and generation peak signal (for example, shown in signal 3337).Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises secondary signal maker (for example, shown in assembly 3370), is configured to receive said drive signal, said first output signal and the said peak signal, and generates the second output signal (for example, shown in signal 3372); Amplifier (for example; Shown in assembly 3334), be configured to receive said second output signal and threshold signal (for example, shown in signal 3335) and (for example generate the 3rd output signal through capacitor; Shown in signal 3381), said capacitor is coupled to said amplifier.In addition, this system comprises comparator (for example, shown in assembly 3382), is configured to receive said the 3rd output signal and ramp signal (for example, shown in signal 3364), and generates comparison signal (for example, shown in signal 3385); The 3rd signal generator (for example, shown in the combination of assembly 3366 and 3390) is configured to receive at least said comparison signal and clock signal (for example, shown in assembly 3362), and generates modulation signal (for example, shown in assembly 3368).In addition, this system comprises gate driver (for example, shown in assembly 3392), is configured to receive said modulation signal and exports said drive signal to said peak detector, said secondary signal maker and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method (for example, realizing like Figure 33, Figure 39 or Figure 40) that is used to adjust supply convertor comprises reception first sensing signal.Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least.In addition, this method comprises the first output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said drive signal and said second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal.In addition, this method comprises that receiving said drive signal, said first exports signal and said peak signal; Handle the information that is associated with said drive signal, the said first output signal and said peak signal; At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal.In addition, this method comprises that receiving said second exports signal and threshold signal; Handle the information that is associated with said second output signal and said threshold signal; At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal.In addition, this method comprises that receiving the said the 3rd exports signal and ramp signal; Handle the information that is associated with said the 3rd output signal and said ramp signal; At least generate comparison signal based on the information that is associated with said the 3rd output signal and said ramp signal.In addition, this method comprises said comparison signal of reception and clock signal; Handle the information that is associated with said comparison signal and said clock signal; At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Shown in Figure 41 or 43) comprise first signal generator (for example, shown in assembly 4150), (for example be configured to receive first sensing signal; Shown in signal 4143) and generate the first output signal (for example, shown in signal 4151) that is associated with demagnetization.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector (for example, shown in assembly 4136); (for example be configured to receive drive signal; Shown in signal 4193) and second sensing signal (for example, shown in signal 4147) and generation peak signal (for example, shown in signal 4137).Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through; And the secondary signal maker (for example; Shown in assembly 4170) be configured to receive at least said drive signal, said first output signal and the said peak signal; And generate the second output signal (for example, shown in signal 4172).In addition, this system comprises amplifier (for example, shown in assembly 4134), is configured to receive said second output signal and threshold signal (for example, shown in signal 4135) and generates the 3rd output signal (for example, shown in signal 4181) through capacitor; The 3rd signal generator (for example, shown in assembly 4184) is configured to receive said the 3rd output signal and first input signal (for example, shown in signal 4183) and generates the 4th output signal (for example, shown in signal 4185).Said capacitor is coupled to said amplifier, and said first input signal is proportional with second input signal (for example, shown in signal 4113) that is received by said elementary winding.In addition, this system comprises comparator (for example, shown in assembly 4182), is configured to receive said the 4th output signal and second sensing signal and generates comparison signal (for example, shown in signal 4187); The 4th signal generator (for example, shown in the combination of assembly 4166 and 4190) is configured to receive at least said comparison signal and clock signal (for example, shown in signal 4162) and generates modulation signal (for example, shown in signal 4168).In addition, this system comprises gate driver (for example, shown in signal 4192), is configured to receive said modulation signal and exports said drive signal to said peak detector, said secondary signal maker and switch.Said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method (for example, realizing like Figure 41 or 43) that is used to adjust supply convertor comprises reception first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises the first output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with the said drive signal and second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal.In addition, this method comprises that receiving said drive signal, said first exports signal and said peak signal; Handle the information that is associated with said drive signal, the said first output signal and said peak signal; At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal.In addition, this method comprises that receiving said second exports signal and threshold signal; Handle the information that is associated with said second output signal and said threshold signal; At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal; Receive said the 3rd output signal and first input signal.Said first input signal is proportional with second input signal that is received by said elementary winding.In addition, this method comprises the information that is associated with said the 3rd output signal and said first input signal of handling; At least generate the 4th output signal based on the information that is associated with said the 3rd output signal and said first input signal; Receive said the 4th output signal and second sensing signal; Handle the information that is associated with said the 4th output signal and said second sensing signal; At least generate comparison signal based on the information that is associated with said the 4th output signal and said second sensing signal.In addition, this method comprises and receives said comparison signal and clock signal at least; Handle the information that is associated with said comparison signal and said clock signal; At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Shown in Figure 44 or 45) comprising: first signal generator (for example, shown in assembly 4450) (for example is configured to receive first sensing signal; Shown in signal 4443) and generate the first output signal (for example, shown in signal 4451) that is associated with demagnetization.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector (for example, shown in assembly 4436); (for example be configured to receive drive signal; Shown in signal 4493) and second sensing signal (for example, shown in signal 4447) and generation peak signal (for example, shown in signal 4437).Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this system comprises secondary signal maker (for example, shown in assembly 4470), is configured to receive at least said drive signal, said first output signal and the said peak signal, and generates the second output signal (for example, shown in signal 4472); Amplifier (for example; Shown in assembly 4434), be configured to receive said second output signal and threshold signal (for example, shown in signal 4435) and (for example generate the 3rd output signal through capacitor; Shown in signal 4481), said capacitor is coupled to said amplifier.In addition; This system comprises the 3rd signal generator (for example, shown in the combination of assembly 4426,4428 and 4484); Be configured to receive said first sensing signal, said the 3rd output signal and said drive signal and generate the 4th output signal (for example, shown in signal 4485); Comparator (for example, shown in assembly 4482) is configured to receive said the 4th output signal and said second sensing signal and generates comparison signal.In addition; This system comprises the 4th signal generator (for example, shown in the combination of assembly 4466 and 4490), (for example is configured to receive at least said comparison signal and clock signal; Shown in signal 4462) and generate modulation signal (for example, shown in signal 4468); Gate driver (for example; Shown in assembly 4492); Be configured to receive said modulation signal and export said drive signal to said peak detector, said secondary signal maker, said the 3rd signal generator and switch, said switch is configured to influence said first electric current of said elementary winding of flowing through.
According to another embodiment, a kind of method (for example, realizing like Figure 44 or 45) that is used to adjust supply convertor comprises reception first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises the first output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with the said drive signal and second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal.In addition, this method comprises that receiving said drive signal, said first exports signal and said peak signal; Handle the information that is associated with said drive signal, the said first output signal and said peak signal; At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal.In addition, this method comprises that receiving said second exports signal and threshold signal; Handle the information that is associated with said second output signal and said threshold signal; At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal.In addition, this method comprises that receiving said first sensing signal, the said the 3rd exports signal and said drive signal; Handle the information that is associated with said first sensing signal, said the 3rd output signal and said drive signal; At least generate the 4th output signal based on the information that is associated with said first sensing signal, said the 3rd output signal and said drive signal.In addition, this method comprises that receiving the said the 4th exports signal and said second sensing signal; Handle the information that is associated with said the 4th output signal and said second sensing signal; At least generate comparison signal based on the information that is associated with said the 4th output signal and said second sensing signal.In addition, this method comprises and receives said comparison signal and clock signal at least; Handle the information that is associated with said comparison signal and said clock signal; At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.
According to another embodiment; A kind of system that is used to adjust supply convertor (for example; Like Figure 33, Figure 39, Figure 40, Figure 41, Figure 43, Figure 44 or shown in Figure 45) (for example comprise first signal generator; Shown in assembly 3350), be configured to receive first sensing signal and generate the output signal that is associated with demagnetization.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this system comprises peak detector (for example, shown in assembly 3336), is configured to receive the drive signal and second sensing signal and generates peak signal (for example, shown in signal 3337).Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition; This system comprises secondary signal maker (for example, shown in the combination of assembly 3366 and 3390), be configured to handle at least with said output signal (for example; Shown in signal 3351) and said peak signal is (for example; Shown in signal 3337) information that is associated, and generate modulation signal (for example, shown in signal 3368); And gate driver (for example, shown in assembly 3392), be configured to receive said modulation signal and export said drive signal to said peak detector and switch at least.Said switch is configured to influence said first electric current of said elementary winding of flowing through.Said drive signal and switch periods (for example, T s) be associated, and said output signal and demagnetization duration (for example, T Demag) be associated.The said demagnetization duration equals the peak value that demagnetizes after multiplying each other with said peak signal in size.This system also is configured to make said switch periods to keep constant, and the mean size that makes said demagnetization peak value (for example, kept constant during T), and makes said output current keep constant in first duration.
According to another embodiment, a kind of method (for example, realizing like Figure 33, Figure 39, Figure 40, Figure 41, Figure 43, Figure 44 or Figure 45) that is used to adjust supply convertor comprises reception first sensing signal.Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least.In addition, this method comprises the output signal that generation and demagnetization are associated; Receive the drive signal and second sensing signal.Said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through.In addition, this method comprises the information that is associated with said drive signal and said second sensing signal of handling; At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal; Handle the information that is associated with said output signal and said peak signal; At least generate modulation signal based on the information that is associated with said output signal and said peak signal.In addition, this method comprises the said modulation signal of reception; And export said drive signal based on the information that is associated with said modulation signal at least, with flow through said first electric current of said elementary winding of influence.Said drive signal and switch periods (for example, T s) be associated, and said output signal and demagnetization duration (for example, T Demag) be associated.The said demagnetization duration equals the peak value that demagnetizes after multiplying each other with said peak signal in size.Make said switch periods keep constant, the mean size that makes said demagnetization peak value (for example, kept constant during T), and makes said output current keep constant in first duration.
Although described specific embodiment of the present invention, yet it will be apparent to one skilled in the art that other embodiment that the existence and the embodiment that describes are equal to.Therefore, will understand that the present invention does not receive the restriction of shown specific embodiment, but only limit the scope of accompanying claims.

Claims (62)

1. system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the output signal that is associated with demagnetization; Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least;
The ramp signal maker is configured to receive said output signal and generates ramp signal;
First comparator is configured to receive said ramp signal and first threshold signal, and generates first comparison signal based on the information with said ramp signal and said first threshold signal correction couplet at least;
Second comparator is configured to receive second sensing signal and second threshold signal and generates second comparison signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
The secondary signal maker is configured to receive at least said first comparison signal and said second comparison signal and generates modulation signal; And
Gate driver is configured to receive said modulation signal and to the switch output drive signal, and said switch is configured to influence said first electric current of said elementary winding of flowing through;
Wherein:
Said output signal was associated with the demagnetization duration;
Said drive signal is associated with switch periods; And
This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant.
2. the system of claim 1 also is configured to make the peak value of said second sensing signal to keep constant in size.
3. system as claimed in claim 2 also is configured to make said output current to keep constant.
4. the system of claim 1, wherein:
Said ramp signal maker comprises capacitor, current source and current sink;
Wherein:
Said capacitor is configured to when said output signal is first logic level, discharged through said current sink, and when said output signal is second logic level, is recharged through said current source; And
Said capacitor also is configured to export said ramp signal.
5. system as claimed in claim 4, wherein:
Said first logic level is a logic high; And
Said second logic level is a logic low.
6. the system of claim 1, wherein, said secondary signal maker comprises trigger assembly.
7. method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
At least generate the output signal based on the information that is associated with said first sensing signal, said output signal is associated with demagnetization;
Receive said output signal;
At least generate ramp signal based on information with said output signal correction couplet;
Receive said ramp signal and first threshold signal;
Handle the information that joins with said ramp signal and said first threshold signal correction;
At least generate first comparison signal based on information with said ramp signal and said first threshold signal correction couplet;
Receive second sensing signal and second threshold signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Handle the information that is associated with said second sensing signal and said second threshold signal;
At least generate second comparison signal based on the information that is associated with said second sensing signal and said second threshold signal;
Receive said first comparison signal and said second comparison signal;
Handle the information that is associated with said first comparison signal and said second comparison signal;
At least generate modulation signal based on the information that is associated with said first comparison signal and said second comparison signal;
Receive said modulation signal;
At least come to the switch output drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence;
Wherein:
Said output signal was associated with the demagnetization duration;
Said drive signal is associated with switch periods; And
Make the said demagnetization duration and the ratio of said switch periods keep constant.
8. system that is used to adjust supply convertor, this system comprises:
First signal generator is configured to receiving inputted signal at least and generates at least and the output signal that demagnetizes and be associated, and said input signal is associated with the output current of supply convertor at least;
First controller is configured to receive at least said output signal, and at least based on coming to generate at least first control signal with the information of said output signal correction couplet;
Second controller is configured to receive first sensing signal and first threshold signal and generates second control signal, and said first sensing signal is associated with first electric current of the elementary winding of the said supply convertor of flowing through;
Oscillator is configured to receive at least said first control signal, and comes to generate at least clock signal based on the information that is associated with said first control signal at least;
The secondary signal maker is configured to receive at least said clock signal and said second control signal, and generates modulation signal at least;
Gate driver is configured to receive at least said modulation signal and to switch output drive signal at least, and said switch is configured to influence said first electric current of said elementary winding of flowing through;
Wherein:
Said output signal was associated with the demagnetization duration; And
Said drive signal is associated with switch periods;
Wherein, said system also is configured to:
Make the said demagnetization duration and the ratio of said switch periods keep constant; And
Make the peak value of said first sensing signal keep constant in size.
9. system as claimed in claim 8 also comprises:
Compensation assembly is configured to generate at least compensating signal;
Wherein:
Said input signal is the combination of the said compensating signal and second sensing signal;
Said second sensing signal is associated with first winding of the secondary winding that is coupled to said supply convertor;
Said secondary winding is relevant with the said output current of said supply convertor at least.
10. method that is used to adjust supply convertor, this method comprises:
At least receiving inputted signal, said input signal is relevant with the output current of supply convertor at least;
At least come to generate at least the output signal based on the information that is associated with said input signal, said output signal is relevant with demagnetization;
At least receive said output signal;
Handle the information that joins with said output signal correction;
At least based on coming to generate at least clock signal with the information of said output signal correction couplet;
Receive sensing signal and threshold signal, said sensing signal is associated with first electric current of the elementary winding of the said supply convertor of flowing through;
Handle the information that is associated with said sensing signal and said threshold signal;
At least generate control signal based on the information that is associated with said sensing signal and said threshold signal;
At least receive said clock signal and said control signal;
Handle the information that is associated with said clock signal and said control signal;
At least come to generate at least modulation signal based on the information that is associated with said clock signal and said control signal;
At least receive said modulation signal;
At least based on the information that is associated with said modulation intelligence to switch output drive signal at least, with flow through said first electric current of said elementary winding of influence;
Wherein:
Said output signal was associated with the demagnetization duration;
Said drive signal is associated with switch periods;
Make the said demagnetization duration and the ratio of said switch periods keep constant; And
Make the peak value of said first sensing signal keep constant in size.
11. a system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the first output signal that is associated with demagnetization; Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least;
The first ramp signal maker is configured to receive the said first output signal and generates first ramp signal;
First comparator is configured to receive said first ramp signal and first threshold signal, and generates first comparison signal based on the information with said first ramp signal and said first threshold signal correction couplet at least;
Peak detector is configured to receive the drive signal and second sensing signal and generates peak signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Amplifier is configured to receive the said peak signal and second threshold signal and generates the second output signal through capacitor, and said capacitor is coupled to said amplifier;
Second comparator is configured to receive the said second output signal and second ramp signal, and generates second comparison signal;
The secondary signal maker is configured to receive at least said first comparison signal and said second comparison signal, and generates modulation signal; And
Gate driver is configured to receive said modulation signal and exports said drive signal to said peak detector and switch, and said switch is configured to influence said first electric current of said elementary winding of flowing through.
12. system as claimed in claim 11, wherein:
The said first output signal was associated with the demagnetization duration;
Said drive signal is associated with switch periods; And
This system also is configured to make the said demagnetization duration and the ratio of said switch periods to keep constant.
13. system as claimed in claim 12 also is configured to make the mean size of said peak signal to keep constant at first duration.
14. system as claimed in claim 13 also is configured to make said output current to keep constant.
15. system as claimed in claim 11, wherein, said peak signal is illustrated in the peak value size of said second sensing signal in each switch periods of said drive signal.
16. system as claimed in claim 11, wherein:
The said first ramp signal maker comprises capacitor, current source and current sink;
Wherein:
Said capacitor is configured to when the said first output signal is first logic level, discharged through said current sink, and when the said first output signal is second logic level, is recharged through said current source; And
Said capacitor also is configured to export said first ramp signal.
17. system as claimed in claim 16, wherein:
Said first logic level is a logic high; And
Said second logic level is a logic low.
18. system as claimed in claim 11, wherein, said secondary signal maker comprises trigger assembly.
19. system as claimed in claim 11 also comprises the second ramp signal maker, is configured to generate said second ramp signal.
20. system as claimed in claim 11, wherein, said amplifier comprises trsanscondutance amplifier.
21. a method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
At least generate the first output signal based on the information that is associated with said first sensing signal, the said first output signal is relevant with demagnetization;
Receive the said first output signal;
At least generate first ramp signal based on information with the said first output signal correction couplet;
Receive said first ramp signal and first threshold signal;
Handle the information that joins with said first ramp signal and said first threshold signal correction;
At least generate first comparison signal based on information with said first ramp signal and said first threshold signal correction couplet;
Receive the drive signal and second sensing signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Handle the information that is associated with said drive signal and said second sensing signal;
At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal;
Receive the said peak signal and second threshold signal;
Handle the information that is associated with said peak signal and said second threshold signal;
At least generate the second output signal based on the information that is associated with said peak signal and said second threshold signal;
Receive the said second output signal and second ramp signal;
Handle the information that is associated with said second output signal and said second ramp signal;
At least generate second comparison signal based on the information that is associated with said second output signal and said second ramp signal;
Receive said first comparison signal and said second comparison signal;
Handle the information that is associated with said first comparison signal and said second comparison signal;
At least generate modulation signal based on the information that is associated with said first comparison signal and said second comparison signal;
Receive said modulation signal; And
At least export said drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence.
22. a system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the output signal that is associated with demagnetization; Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Peak detector is configured to receive the drive signal and second sensing signal and generates peak signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
The secondary signal maker is configured to handle at least the information that is associated with said output signal and said peak signal, and generates modulation signal; And
Gate driver is configured to receive said modulation signal and exports said drive signal to said peak detector and switch, and said switch is configured to influence said first electric current of said elementary winding of flowing through;
Wherein:
Said output signal was associated with the demagnetization duration; And
Said drive signal is associated with switch periods;
Wherein, this system also is configured to:
Make the said demagnetization duration and the ratio of said switch periods keep constant; And
Make the mean size of said peak signal keep constant at first duration.
23. the system of claim 22 also is configured to make said output current to keep constant.
24. a method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
At least generate the output signal based on the information that is associated with said first sensing signal, said first sensing signal is relevant with demagnetization;
Receive the drive signal and second sensing signal;
Handle the information be associated with said drive signal and said second sensing signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal;
At least handle the information that is associated with said output signal and said peak signal;
At least generate modulation signal based on the information that is associated with said output signal and said peak signal;
Receive said modulation signal;
At least export said drive signal based on the information that is associated with said modulation signal to switch, to influence said first electric current of the said elementary winding of flowing through at least;
Wherein:
Said output signal was associated with the demagnetization duration;
Said drive signal is associated with switch periods;
Make the said demagnetization duration and the ratio of said switch periods keep constant; And
Make the mean size of said peak signal keep constant at first duration.
25. a system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the first output signal that is associated with demagnetization; Said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least;
Peak detector is configured to receive the drive signal and second sensing signal and generates peak signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
The secondary signal maker is configured to receive said drive signal, said first output signal and the said peak signal, and generates the second output signal;
Amplifier is configured to receive said second output signal and threshold signal and generates the 3rd output signal through capacitor, and said capacitor is coupled to said amplifier;
Comparator is configured to receive said the 3rd output signal and ramp signal, and generates comparison signal;
The 3rd signal generator is configured to receive at least said comparison signal and clock signal, and generates modulation signal;
Gate driver is configured to receive said modulation signal and exports said drive signal to said peak detector, said secondary signal maker and switch, and said switch is configured to influence said first electric current of said elementary winding of flowing through.
26. system as claimed in claim 25, wherein:
Said drive signal is associated with switch periods; And
This system also is configured to make said switch periods to keep constant.
27. system as claimed in claim 26, wherein:
The said first output signal was associated with the demagnetization duration;
After multiplying each other, said demagnetization duration and said peak signal equal the peak value that demagnetizes in size; And
This system also is configured to make the mean size of said demagnetization peak value to keep constant at first duration.
28. system as claimed in claim 27 also is configured to make said output current to keep constant.
29. system as claimed in claim 25 also is configured to:
It is constant that the Shi Suoshu output current keeps; And
Make said power factor keep being substantially equal to 1.
30. system as claimed in claim 29 also is configured to offer one or more light-emitting diodes to the said output current of major general.
31. system as claimed in claim 25 also comprises oscillator, is configured to generate said clock signal and said ramp signal.
32. system as claimed in claim 25, wherein, said the 3rd signal generator comprises the trigger assembly that is coupled to door.
33. system as claimed in claim 25, wherein, the said second output signal is long-pending proportional with said demagnetization duration and said peak signal in size.
34. system as claimed in claim 25, wherein, said peak signal is illustrated in the peak value size of said second sensing signal in each switch periods of said drive signal.
35. system as claimed in claim 25, wherein, said amplifier comprises trsanscondutance amplifier.
36. system as claimed in claim 25, wherein, said secondary signal maker comprises the Cycle by Cycle integrator, and said Cycle by Cycle integrator is reset to each switch periods.
37. a method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is relevant with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is associated with the output current of said supply convertor at least;
Generate the first output signal that is associated with demagnetization;
Receive the drive signal and second sensing signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Handle the information that is associated with said drive signal and said second sensing signal;
At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal;
Receive said drive signal, said first output signal and the said peak signal;
Handle the information that is associated with said drive signal, the said first output signal and said peak signal;
At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal;
Receive said second output signal and the threshold signal;
Handle the information that is associated with said second output signal and said threshold signal;
At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal;
Receive said the 3rd output signal and ramp signal;
Handle the information that is associated with said the 3rd output signal and said ramp signal;
At least generate comparison signal based on the information that is associated with said the 3rd output signal and said ramp signal;
Receive said comparison signal and clock signal;
Handle the information that is associated with said comparison signal and said clock signal;
At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal;
Receive said modulation signal; And
At least export said drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence.
38. a system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the first output signal that is associated with demagnetization; Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Peak detector is configured to receive the drive signal and second sensing signal and generates peak signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
The secondary signal maker is configured to receive at least said drive signal, said first output signal and the said peak signal, and generates the second output signal;
Amplifier is configured to receive said second output signal and threshold signal and generates the 3rd output signal through capacitor, and said capacitor is coupled to said amplifier;
The 3rd signal generator is configured to receive said the 3rd output signal and first input signal and generates the 4th output signal, and said first input signal is proportional with second input signal that is received by said elementary winding;
Comparator is configured to receive said the 4th output signal and second sensing signal and generates comparison signal;
The 4th signal generator is configured to receive at least said comparison signal and clock signal and generates modulation signal;
Gate driver is configured to receive said modulation signal and exports said drive signal to said peak detector, said secondary signal maker and switch, and said switch is configured to influence said first electric current of said elementary winding of flowing through.
39. system as claimed in claim 38, wherein, said the 3rd signal generator comprises the multiplier that is used to generate said the 4th output signal, and said the 4th output signal equals said the 3rd output signal times in size with said first input signal.
40. system as claimed in claim 38, wherein:
Said drive signal is associated with switch periods; And
This system also is configured to make said switch periods to keep constant.
41. system as claimed in claim 38, wherein:
The said first output signal was associated with the demagnetization duration;
After multiplying each other, said demagnetization duration and said peak signal equal the peak value that demagnetizes in size; And
This system also is configured to make the mean size of said demagnetization peak value to keep constant at first duration.
42. system as claimed in claim 38 also is configured to make said output current to keep constant.
43. system as claimed in claim 38 also is configured to:
Make said output current keep constant; And
Make said power factor keep being substantially equal to 1.
44. system as claimed in claim 38 also is configured to offer one or more light-emitting diodes to the said output current of major general.
45. system as claimed in claim 38, wherein, the said second output signal is long-pending proportional with said demagnetization duration and said peak signal in size.
46. system as claimed in claim 38, wherein, said peak signal is illustrated in the peak value size of said second sensing signal in each switch periods of said drive signal.
47. system as claimed in claim 38, wherein, said secondary signal maker comprises the Cycle by Cycle integrator, and said Cycle by Cycle integrator is reset to each switch periods.
48. a method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Generate the first output signal that is associated with demagnetization;
Receive the drive signal and second sensing signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Handle the information that is associated with the said drive signal and second sensing signal;
At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal;
Receive said drive signal, said first output signal and the said peak signal;
Handle the information that is associated with said drive signal, the said first output signal and said peak signal;
At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal;
Receive said second output signal and the threshold signal;
Handle the information that is associated with said second output signal and said threshold signal;
At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal;
Receive said the 3rd output signal and first input signal, said first input signal is proportional with second input signal that is received by said elementary winding;
Handle the information that is associated with said the 3rd output signal and said first input signal;
At least generate the 4th output signal based on the information that is associated with said the 3rd output signal and said first input signal;
Receive said the 4th output signal and second sensing signal;
Handle the information that is associated with said the 4th output signal and said second sensing signal;
At least generate comparison signal based on the information that is associated with said the 4th output signal and said second sensing signal;
At least receive said comparison signal and clock signal;
Handle the information that is associated with said comparison signal and said clock signal;
At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal;
Receive said modulation signal; And
At least export said drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence.
49. a system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the first output signal that is associated with demagnetization; Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Peak detector is configured to receive the drive signal and second sensing signal and generates peak signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
The secondary signal maker is configured to receive at least said drive signal, said first output signal and the said peak signal, and generates the second output signal;
Amplifier is configured to receive said second output signal and threshold signal and generates the 3rd output signal through capacitor, and said capacitor is coupled to said amplifier;
The 3rd signal generator is configured to receive said first sensing signal, said the 3rd output signal and said drive signal and generates the 4th output signal;
Comparator is configured to receive said the 4th output signal and said second sensing signal and generates comparison signal;
The 4th signal generator is configured to receive at least said comparison signal and clock signal and generates modulation signal;
Gate driver; Be configured to receive said modulation signal and export said drive signal to said peak detector, said secondary signal maker, said the 3rd signal generator and switch, said switch is configured to influence said first electric current of said elementary winding of flowing through.
50. system as claimed in claim 49, wherein, said the 3rd signal generator comprises:
Switch is configured to receive said first sensing signal and by the control of said drive signal;
Multiplier is configured to export said the 4th output signal; And
Operational amplifier is coupled to said switch and said multiplier.
51. system as claimed in claim 49, wherein:
Said drive signal is associated with switch periods; And
This system also is configured to make said switch periods to keep constant.
52. system as claimed in claim 51, wherein:
The said first output signal was associated with the demagnetization duration;
After multiplying each other, said demagnetization duration and said peak signal equal the peak value that demagnetizes in size; And
This system also is configured to make the mean size of said demagnetization peak value to keep constant at first duration.
53. system as claimed in claim 52 also is configured to make said output current to keep constant.
54. system as claimed in claim 49 also is configured to:
Make said output current keep constant; And
Make said power factor keep being substantially equal to 1.
55. system as claimed in claim 49 also is configured to offer one or more light-emitting diodes to the said output current of major general.
56. system as claimed in claim 49, wherein, the said second output signal is long-pending proportional with said demagnetization duration and said peak signal in size.
57. system as claimed in claim 49, wherein, said peak signal is illustrated in the peak value size of said second sensing signal in each switch periods of said drive signal.
58. system as claimed in claim 49, wherein, said secondary signal maker comprises the Cycle by Cycle integrator, and said Cycle by Cycle integrator is reset to each switch periods.
59. a method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Generate the first output signal that is associated with demagnetization;
Receive the drive signal and second sensing signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Handle the information that is associated with the said drive signal and second sensing signal;
At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal;
Receive said drive signal, said first output signal and the said peak signal;
Handle the information that is associated with said drive signal, the said first output signal and said peak signal;
At least generate the second output signal based on the information that is associated with said drive signal, the said first output signal and said peak signal;
Receive said second output signal and the threshold signal;
Handle the information that is associated with said second output signal and said threshold signal;
At least generate the 3rd output signal based on the information that is associated with said second output signal and said threshold signal;
Receive said first sensing signal, said the 3rd output signal and said drive signal;
Handle the information that is associated with said first sensing signal, said the 3rd output signal and said drive signal;
At least generate the 4th output signal based on the information that is associated with said first sensing signal, said the 3rd output signal and said drive signal;
Receive said the 4th output signal and said second sensing signal;
Handle the information that is associated with said the 4th output signal and said second sensing signal;
At least generate comparison signal based on the information that is associated with said the 4th output signal and said second sensing signal;
At least receive said comparison signal and clock signal;
Handle the information that is associated with said comparison signal and said clock signal;
At least generate modulation signal based on the information that is associated with said comparison signal and said clock signal;
Receive said modulation signal; And
At least export said drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence.
60. a system that is used to adjust supply convertor, this system comprises:
First signal generator; Be configured to receive first sensing signal and generate the output signal that is associated with demagnetization; Said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Peak detector is configured to receive the drive signal and second sensing signal and generates peak signal, and said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
The secondary signal maker is configured to handle at least the information that is associated with said output signal and said peak signal, and generates modulation signal; And
Gate driver is configured to receive said modulation signal and exports said drive signal to said peak detector and switch at least, and said switch is configured to influence said first electric current of said elementary winding of flowing through;
Wherein:
Said drive signal is associated with switch periods;
Said output signal was associated with the demagnetization duration; And
After multiplying each other, said demagnetization duration and said peak signal equal the peak value that demagnetizes in size;
Wherein, this system also is configured to:
Make said switch periods keep constant;
Make the mean size of said demagnetization peak value keep constant at first duration; And
Make said output current keep constant.
61. system as claimed in claim 60 also is configured to make power factor to keep being substantially equal to 1.
62. a method that is used to adjust supply convertor, this method comprises:
Receive first sensing signal, said first sensing signal is associated with first winding of the secondary winding that is coupled to supply convertor, and said secondary winding is relevant with the output current of said supply convertor at least;
Generate the output signal that is associated with demagnetization;
Receive the drive signal and second sensing signal, said second sensing signal is associated with first electric current of the elementary winding of the secondary winding that is coupled to said supply convertor of flowing through;
Handle the information that is associated with said drive signal and said second sensing signal;
At least generate peak signal based on the information that is associated with said drive signal and said second sensing signal;
Handle the information that is associated with said output signal and said peak signal;
At least generate modulation signal based on the information that is associated with said output signal and said peak signal;
Receive said modulation signal; And
At least export said drive signal based on the information that is associated with said modulation signal, with flow through said first electric current of said elementary winding of influence;
Wherein:
Said drive signal is associated with switch periods;
Said output signal was associated with the demagnetization duration; And
After multiplying each other, said demagnetization duration and said peak signal equal the peak value that demagnetizes in size;
Wherein:
Make said switch periods keep constant;
Make the mean size of said demagnetization peak value keep constant at first duration; And
Make said output current keep constant.
CN201110051423.2A 2008-10-21 2011-02-28 System and method used for constant-voltage mode and constant-current mode in flyback supply convertor Active CN102651613B (en)

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CN201110051423.2A CN102651613B (en) 2011-02-28 2011-02-28 System and method used for constant-voltage mode and constant-current mode in flyback supply convertor
US13/071,384 US8488342B2 (en) 2008-10-21 2011-03-24 Systems and methods for constant voltage mode and constant current mode in flyback power converters with primary-side sensing and regulation
TW100129097A TWI448060B (en) 2011-02-28 2011-08-15 A system and method for adjusting a power converter
US13/857,836 US9350252B2 (en) 2008-10-21 2013-04-05 Systems and methods for protecting power conversion systems based on at least feedback signals
US13/915,477 US9385612B2 (en) 2008-10-21 2013-06-11 Systems and methods for constant voltage mode and constant current mode in flyback power converters with primary-side sensing and regulation
US15/099,419 US10008939B2 (en) 2008-10-21 2016-04-14 Systems and methods for protecting power conversion systems based on at least feedback signals
US15/152,362 US10277132B2 (en) 2008-10-21 2016-05-11 Systems and methods for constant voltage mode and constant current mode in flyback power converters with primary-side sensing and regulation

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