CN104009640A - Controller for power converter capable of adjusting jittering amplitude, and correlation method thereof - Google Patents
Controller for power converter capable of adjusting jittering amplitude, and correlation method thereof Download PDFInfo
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- CN104009640A CN104009640A CN201310060456.2A CN201310060456A CN104009640A CN 104009640 A CN104009640 A CN 104009640A CN 201310060456 A CN201310060456 A CN 201310060456A CN 104009640 A CN104009640 A CN 104009640A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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Abstract
The invention discloses a controller for a power converter capable of adjusting jittering amplitude, and a correlation method thereof. The controller comprises a feedback pin, a first logic unit, a logic circuit, an auxiliary pin and a current detection pin. The feedback pin receives feedback voltage from the secondary side of the power converter; the logic circuit generates jittering signals according to frequency, feedback voltages and first resistance; the auxiliary pin receives voltages of an auxiliary winding of the power converter; and the current detection pin generates detection voltages according to currents flowing through the primary side of the power converter; the voltages, the jittering signals and the detection voltages, determining the starting time of the primary side of the power converter, such that in a quasi-resonance mode pulse width modulation architecture, jittering can be performed on the main switch frequency and secondary higher harmonic waves of a powers witch on a frequency spectrum so as to carry out energy diffusion and reduce the peak value energy of electromagnetic interference.
Description
Technical field
The invention relates to a kind of controller of power supply changeover device of adjustable jitter amplitude and the method that the controller of power supply changeover device produces adjustable jitter amplitude, espespecially utilize the shake of logical circuit in controller from the feedback voltage of secondary side of power supply changeover device or an electric current for the primary side of the voltage source transducer of flowing through, to adjust the controller of open-interval power supply changeover device and to produce the method for adjustable jitter amplitude.
Background technology
Switched power supply (switching power supply) has been the power supply unit that most of consumer electronic devices adopt, it is by the switching of a power switch, control the energy storage in inductance and release energy, the power supply of requirement up to specification is provided.If the switching of power switch, is to be maintained at a characteristic frequency always, be easy to online by electronic installation, radiate the electromagnetic wave with that characteristic frequency, and may have the problem of electromagnetic interference.
A kind of method that solves electromagnetic interference is to make the switching frequency shake (jitter) of power switch near characteristic frequency, the frequency jitter being namely commonly called as (frequency jittering).The main purpose of shake is that main switch frequency and next higher harmonics for power switch shaken on frequency spectrum, to carry out energy dissipation, reduces the peak energy of electromagnetic interference.
In quasi-resonant mode pulse width modulation (Quasi resonant mode PWM) framework, quasi-resonant mode pulse width modulation framework can be beated naturally at the first trough and the second trough, produce the phenomenon of similar shake, but this phenomenon is not remarkable to the improvement of electromagnetic interference.In addition, quasi-resonant mode pulse width modulation framework is conventionally when low-voltage heavy duty, and the peak energy of electromagnetic interference can be very large, and for example, when the frequency of pulse width modulation is between 150KHz during to 1MHz, the peak energy of electromagnetic interference can be very large.
Summary of the invention
One embodiment of the invention disclose a kind of controller of power supply changeover device of adjustable jitter amplitude.This controller comprises a feedback pin, a logical circuit, an auxiliary pin and a current sense pin.This feedback pin is to receive a feedback voltage in order to the secondary side from this power supply changeover device, and wherein the output voltage of the secondary side of this feedback voltage and this power supply changeover device is relevant; This logical circuit is in order to according to a frequency, this feedback voltage and one first resistance, produces a dither signal; This auxiliary pin is to receive this relevant for a voltage of an auxiliary winding of this power supply changeover device; This current sense pin is in order to according to the electric current of the primary side of this power supply changeover device of flowing through, and produces a detecting voltage; This voltage, this dither signal and this detecting voltage are the opening times that determines the primary side of this power supply changeover device.
Another embodiment of the present invention discloses a kind of controller of power supply changeover device of adjustable jitter amplitude.This controller comprises a feedback pin, a logical circuit, an auxiliary pin and a current sense pin.This feedback pin is to receive a feedback voltage in order to the secondary side from this power supply changeover device, and wherein the output voltage of the secondary side of this feedback voltage and this power supply changeover device is relevant; This first logical block is in order to according to a frequency, produces the digital signal with a pre-determined bit; This logical circuit is in order to according to the electric current of the primary side of a frequency and this power supply changeover device of flowing through, and produces one and adjusts electric current; This auxiliary pin is in order to receive the voltage relevant for an auxiliary winding of this power supply changeover device; This current sense pin is in order to according to this adjustment electric current, produces a detecting voltage; This voltage, this feedback voltage and this detecting voltage are the opening times that determines the primary side of this power supply changeover device.
The controller that another embodiment of the present invention discloses a kind of power supply changeover device produces the method for adjustable jitter amplitude, this controller comprises a feedback pin, a logical circuit, a current sense pin and an auxiliary pin, and wherein this logical circuit comprises one first logical block and one second logical block.The method comprises this feedback pin and receives a feedback voltage from the secondary side of this power supply changeover device, and wherein the output voltage of the secondary side of this feedback voltage and this power supply changeover device is relevant; This logical circuit, according to a frequency, produces the digital signal with a pre-determined bit; This auxiliary pin receives the voltage relevant for an auxiliary winding of this power supply changeover device; This current sense pin, according to the electric current of the primary side of this power supply changeover device of flowing through, produces a detecting voltage; According to the digital signal of this voltage, this pre-determined bit and this detecting voltage, determine the opening time of the primary side of this power supply changeover device.
The present invention discloses a kind of controller of power supply changeover device of adjustable jitter amplitude and the method that the controller of power supply changeover device produces adjustable jitter amplitude.This controller and the method are to utilize the shake of logical circuit in this controller from the feedback voltage of secondary side of this power supply changeover device or the electric current of the primary side of this voltage source transducer of flowing through, and make opening time of power switch of primary side of this source converter of electricity fixing.So, compared to prior art, the present invention can be in a quasi-resonant mode pulse width modulation (Quasiresonant mode PWM) framework, main switch frequency and next higher harmonics for this power switch on frequency spectrum are shaken, to carry out energy dissipation, reduce the peak energy of electromagnetic interference.
Accompanying drawing explanation
Fig. 1 is the schematic diagram for the controller of the power supply changeover device of a kind of adjustable jitter amplitude of one embodiment of the invention explanation.
Fig. 2 is the schematic diagram for explanation dither signal.
Fig. 3 is the open-interval schematic diagram for the primary side of description references voltage, dither signal, voltage, detecting voltage and power supply changeover device.
Fig. 4 is the schematic diagram for the controller of the power supply changeover device of a kind of adjustable jitter amplitude of another embodiment of the present invention explanation.
Fig. 5 is the schematic diagram for the controller of the power supply changeover device of a kind of adjustable jitter amplitude of another embodiment of the present invention explanation.
Fig. 6 is the open-interval schematic diagram for the primary side of description references voltage, voltage, feedback voltage, detecting voltage and power supply changeover device.
Fig. 7 produces the flow chart of the method for adjustable jitter amplitude for another embodiment of the present invention illustrates a kind of controller of power supply changeover device.
Fig. 8 produces the flow chart of the method for adjustable jitter amplitude for another embodiment of the present invention illustrates a kind of controller of power supply changeover device.
Wherein, description of reference numerals is as follows:
100,400,500 controllers
102 feedback pins
104,504 logical circuits
106 auxiliary pin
108 current sense pins
110 bleeder circuits
112,412 logical blocks
114 first comparators
116 second comparators
118 power switchs
1042,5,042 first logical blocks
1044,5,044 second logical blocks
10442 amplifiers
10444 variable resistors
10446 switchs
AUX assists winding
CLK frequency
DS digital signal
DV detects voltage
FS shutdown signal
IA adjusts electric current
IPRI electric current
JS dither signal
OS start signal
PRI primary side
R1 the first resistance
RCS resistance
SEC secondary side
The T cycle
The TON opening time
VREF reference voltage
VD, VAUX, VD1 voltage
VFB feedback voltage
VOUT output voltage
700-714,800-812 step
Embodiment
Please refer to Fig. 1, Fig. 1 is the schematic diagram for the controller 100 of the power supply changeover device of a kind of adjustable jitter amplitude of one embodiment of the invention explanation.As shown in Figure 1, controller 100 comprises a feedback pin 102, a logical circuit 104, an auxiliary pin 106 and a current sense pin 108.Feedback pin 102 is to receive a feedback voltage VFB in order to the secondary side SEC from power supply changeover device, and wherein the output voltage VO UT of the secondary side SEC of feedback voltage VFB and power supply changeover device is relevant, and is to be a direct voltage; Logical circuit 104 is in order to according to a frequency CLK, feedback voltage VFB and one first resistance R 1, produces a dither signal JS, and its medium frequency CLK is the internal frequency for controller 100; Auxiliary pin 106 is in order to receive the voltage VD relevant for an auxiliary winding AUX of power supply changeover device, wherein voltage VD is produced by the bleeder circuit 110 that is coupled to auxiliary winding AUX, voltage VD can set the first resistance R 1 by a logical block 112, and voltage VD relates to the voltage VAUX of auxiliary winding AUX; Current sense pin 108 is in order to according to the electric current of the primary side PRI of the power supply changeover device of flowing through, produces a detecting voltage DV; Voltage VD, dither signal JS and detecting voltage DV are the opening times that determines the primary side PRI of power supply changeover device.
As shown in Figure 1, logical circuit 104 comprises one first logical block 1042 and one second logical block 1044.The first logical block 1042 is in order to according to frequency CLK, generation has the digital signal DS (for example digital signal of 4) of a pre-determined bit, wherein in a cycle of frequency CLK, the digital signal DS of pre-determined bit successively decreases after increasing progressively gradually gradually, or the cycle period increasing progressively gradually after successively decreasing gradually.But the present invention is not limited to the digital signal of 4.The second logical block 1044 comprises an amplifier 10442, a variable resistor 10444 and a switch 10446.Amplifier 10442 has a first input end, in order to receive feedback voltage VFB, and one second input; Variable resistor 10444 is the second input and the switchs 10446 that are coupled to amplifier 10442.Therefore, as shown in Figure 1, switch 10446 can, according to the digital signal DS of pre-determined bit, switch the switch of switch 10446 inside to adjust the resistance of variable resistor 10444.In addition, variable resistor 10444 is not limited to comprise 4 series resistances.
Because in a cycle of frequency CLK, the digital signal DS of pre-determined bit successively decreases after increasing progressively gradually gradually, or increase progressively gradually after successively decreasing gradually, so switch 10446 can be according to the digital signal DS of pre-determined bit, adjust gradually variable resistor 10444 by diminish resistance or become large resistance by little resistance of large resistance.So, the second logical block 1044 can, according to the resistance of feedback voltage VFB, variable resistor 10444, the first resistance R 1 and formula (1), produce dither signal JS:
In formula (1), R is the resistance for variable resistor 10444.From formula (1), the first resistance R 1 can be controlled the peak swing (for example the peak swing of dither signal JS is dither signal JS ± 4%) of dither signal JS, and dither signal JS can according to the cycle of the resistance of variable resistor 10444 and digital signal DS periodically gradually from large to small or change from small to big.Please refer to Fig. 2, Fig. 2 is the schematic diagram for explanation dither signal JS.As shown in Figure 2 because digital signal DS is to be 4 position digital signals, so dither signal JS is in a cycle T of digital signal DS, in the peak swing of dither signal JS in the mode on 15 rank gradually from large to small or change from small to big.
As shown in Figure 1, controller 100 separately comprises one first comparator 114 and one second comparator 116.The first comparator 114 is in order to according to voltage VD and a reference voltage VREF, produces and export a start signal OS to the power switch 118 of the primary side of power supply changeover device, and wherein power switch 118 is to be incorporated in controller 100; The second comparator 116 is in order to according to dither signal JS and detecting voltage DV, produces and export a shutdown signal FS to power switch 118.
Please refer to Fig. 3, Fig. 3 is the schematic diagram for the opening time TON (opening time of power switch 118) of the primary side PRI of description references voltage VREF, dither signal JS, voltage VD, detecting voltage DV and power supply changeover device.As shown in Figure 3, when voltage VD declines (because voltage VAUX decline) when lower than reference voltage VREF because power switch 118 is closed, the first comparator 114 can produce start signal OS to the power switch 118 of the primary side of power supply changeover device, causes power switch 118 to be opened.In addition, when detecting voltage DV higher than dither signal JS, the second comparator 116 can produce shutdown signal FS to power switch 118.Therefore, start signal OS and shutdown signal FS can determine the opening time TON of the primary side PRI of power supply changeover device.Yet because dither signal JS is in the cycle T of digital signal DS, periodically gradually from large to small or change from small to big, so opening time TON also can change along with dither signal JS, that is opening time TON on-fixed.
Please refer to Fig. 4, Fig. 4 is the schematic diagram for the controller 400 of the power supply changeover device of a kind of adjustable jitter amplitude of another embodiment of the present invention explanation.So the voltage VD1 that the difference of controller 400 and controller 100 produces when power switch 118 is closed at the resistance R CS by being coupled to current sense pin 108 sets the first resistance R 1 by a logical block 412.In addition, all the other operating principles of controller 400 are all identical with controller 400, do not repeat them here.
Please refer to Fig. 5, Fig. 5 is the schematic diagram for the controller 500 of the power supply changeover device of a kind of adjustable jitter amplitude of another embodiment of the present invention explanation.The difference of controller 500 and controller 100 is that the logical circuit 504 of controller 500 is in order to according to the electric current I PRI of the primary side PRI of a frequency CLK and the power supply changeover device of flowing through, produces one and adjusts electric current I A; Current sense pin 108 is in order to according to adjusting electric current I A, produces a detecting voltage DV.
As shown in Figure 5, logical circuit 504 comprises one first logical block 5042 and one second logical block 5044, the first logical block 5042 is in order to according to a frequency CLK, generation has the digital signal DS (for example digital signal of 4) of a pre-determined bit, wherein in a cycle of frequency CLK, the digital signal DS of pre-determined bit successively decreases after increasing progressively gradually gradually, or increases progressively gradually after successively decreasing gradually.But the present invention is not limited to the digital signal of 4.The second logical block 5044 is in order to according to the electric current I PRI of the primary side PRI of the digital signal DS of pre-determined bit and the power supply changeover device of flowing through, produces and adjusts electric current I A.
Please refer to Fig. 6, Fig. 6 is the schematic diagram for the opening time TON (opening time of power switch 118) of the primary side PRI of description references voltage VREF, voltage VD, feedback voltage VFB, detecting voltage DV and power supply changeover device.Because in a cycle of frequency CLK, the second logical block 5044 is the digital signal DS according to pre-determined bit, the electric current I PRI that successively decreases gradually after periodically increasing progressively gradually produces and adjusts electric current I A, or after successively decreasing gradually, increase progressively gradually electric current I PRI and produce to adjust electric current I A, and current sense pin 108 is according to adjusting electric current I A, produce detecting voltage DV, so detecting voltage DV also can be along with the cycle T periodic variation of the digital signal DS of pre-determined bit.As shown in Figure 6, when voltage VD declines (because voltage VAUX decline) when lower than reference voltage VREF because power switch 118 is closed, the first comparator 114 can produce start signal OS to the power switch 118 of the primary side of power supply changeover device, causes power switch 118 to be opened.In addition, when detecting voltage DV higher than feedback voltage VFB, the second comparator 116 can produce shutdown signal FS to power switch 118.Therefore, start signal OS and shutdown signal FS can determine the opening time TON of the primary side PRI of power supply changeover device.Yet because detecting voltage DV is in the cycle T of digital signal DS, periodically gradually from large to small or change from small to big, so opening time TON also can change along with detecting voltage DV, that is opening time TON on-fixed.
Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 7, Fig. 7 produces the flow chart of the method for adjustable jitter amplitude for another embodiment of the present invention illustrates a kind of controller of power supply changeover device.The method of Fig. 7 is to utilize controller 100 explanations of Fig. 1, and detailed step is as follows:
Step 700: start;
Step 702: feedback pin 102 receives a feedback voltage VFB from the secondary side SEC of power supply changeover device;
Step 704: the first logical block 1042, according to a frequency CLK, produces the digital signal DS with a pre-determined bit;
Step 706: the second logical block 1044, according to the digital signal DS of pre-determined bit, is adjusted the resistance of a variable resistor 10444;
Step 708: the second logical block 1044, according to the resistance of feedback voltage VFB, variable resistor 10444 and the first resistance R 1, produces a dither signal JS, skips to step 714;
Step 710: the voltage VD that auxiliary pin 106 receives relevant for the auxiliary winding AUX of power supply changeover device, skips to step 714;
Step 712: current sense pin 108, according to the electric current of the primary side PRI of the power supply changeover device of flowing through, produces a detecting voltage DV;
Step 714: according to voltage VD, dither signal JS and detecting voltage DV, determine the opening time TON of the primary side PRI of power supply changeover device; Rebound step 702, step 710 and step 712.
In step 702, feedback voltage VFB is relevant with the output voltage VO UT of the secondary side SEC of power supply changeover device, and is to be a direct voltage.In step 704, the first logical block 104 is in order to according to frequency CLK, generation has the digital signal DS (for example digital signal of 4) of pre-determined bit, wherein in a cycle of frequency CLK, the digital signal DS of pre-determined bit successively decreases after increasing progressively gradually gradually, or increases progressively gradually after successively decreasing gradually.But the present invention is not limited to the digital signal of 4.In addition, frequency CLK is to be the frequency in controller 100.In step 706, switch 10446 can, according to the digital signal DS of pre-determined bit, switch the switch of switch 10446 inside to adjust the resistance of variable resistor 10444.Because in a cycle of frequency CLK, the digital signal DS of pre-determined bit successively decreases after increasing progressively gradually gradually, or increase progressively gradually after successively decreasing gradually, so switch 10446 can be according to the digital signal DS of pre-determined bit, adjust gradually variable resistor 10444 by diminish resistance or become large resistance by little resistance of large resistance.So, in step 708, the second logical block 1044 can be according to the resistance of feedback voltage VFB, variable resistor 10444, the first resistance R 1, produce dither signal JS, wherein dither signal JS is in a cycle T of digital signal DS, in the peak swing of dither signal JS in the mode on 15 rank gradually from large to small or change from small to big (as shown in Figure 2).In step 710, voltage VD is produced by the bleeder circuit 110 that is coupled to auxiliary winding AUX, and voltage VD can set the first resistance R 1 (as shown in Figure 2) by a logical block 112.But in another embodiment of the present invention, be that the voltage VD1 being produced when power switch 118 is closed by the resistance R CS that is coupled to current sense pin 108 sets the first resistance R 1 (as shown in Figure 4) by a logical block 412.In step 714, as shown in figures 1 and 3, the first comparator 114 in controller 100 can produce and export a start signal OS to the power switch 118 of the primary side of power supply changeover device according to voltage VD and a reference voltage VREF, and wherein power switch 118 is to be incorporated in controller 100; The second comparator 116 in controller 100 can, according to dither signal JS and detecting voltage DV, produce and export a shutdown signal FS to power switch 118.Therefore, controller 100 can pass through start signal OS and shutdown signal FS, determines the opening time TON of the primary side PRI of power supply changeover device.Yet because dither signal JS is in the cycle T of digital signal DS, periodically gradually from large to small or change from small to big, so opening time TON also can change along with dither signal JS, that is opening time TON on-fixed.
Please refer to Fig. 5, Fig. 6 and Fig. 8, Fig. 8 produces the flow chart of the method for adjustable jitter amplitude for another embodiment of the present invention illustrates a kind of controller of power supply changeover device.The method of Fig. 8 is to utilize controller 500 explanations of Fig. 5, and detailed step is as follows:
Step 800: start;
Step 802: feedback pin 102 receives a feedback voltage VFB from the secondary side SEC of power supply changeover device, skips to step 812;
Step 804: the first logical block 5042, according to a frequency CLK, produces the digital signal DS with a pre-determined bit;
Step 806: the second logical block 5044, according to the electric current I PRI of the primary side PRI of the digital signal DS of pre-determined bit and the power supply changeover device of flowing through, produces and adjusts electric current I A;
Step 808: current sense pin 108, according to adjusting electric current I A, produces detecting voltage DV, skips to step 812;
Step 810: the voltage VD that auxiliary pin 106 receives relevant for the auxiliary winding AUX of power supply changeover device;
Step 812: according to voltage VD, feedback voltage VFB and detecting voltage DV, determine the opening time TON of the primary side PRI of power supply changeover device; Rebound step 802 step 804 and step 810.
The difference of the embodiment of Fig. 8 and the embodiment of Fig. 7 is in step 806, and the second logical block 5044 is according to the electric current I PRI of the primary side PRI of the digital signal DS of pre-determined bit and the power supply changeover device of flowing through, produces and adjusts electric current I A; In step 810, current sense pin 108 is according to adjusting electric current I A, produces a detecting voltage DV.Therefore,, in step 812, as shown in Figure 5 and Figure 6, the first comparator 114 in controller 500 can, according to voltage VD and a reference voltage VREF, produce and export a start signal OS to the power switch 118 of the primary side of power supply changeover device; In addition, the second comparator 116 in controller 500 can, according to as detecting voltage DV and feedback voltage VFB, produce and export a shutdown signal FS to power switch 118.Therefore, controller 500 can determine by start signal OS and shutdown signal FS the opening time TON of the primary side PRI of power supply changeover device.Yet because detecting voltage DV is in the cycle T of digital signal DS, periodically gradually from large to small or change from small to big, so opening time TON also can change along with detecting voltage DV, that is opening time TON on-fixed.
In sum, the controller of the power supply changeover device of adjustable jitter amplitude disclosed in this invention and the controller of power supply changeover device produce the method for adjustable jitter amplitude, be to utilize the shake of logical circuit in controller from the feedback voltage of secondary side of power supply changeover device or the electric current of the primary side of the voltage source transducer of flowing through, make opening time of power switch of primary side of power supply changeover device fixing.So, compared to prior art, the present invention can be in quasi-resonant mode pulse width modulation (Quasi resonant mode PWM) framework, main switch frequency and next higher harmonics for power switch on frequency spectrum are shaken, to carry out energy dissipation, reduce the peak energy of electromagnetic interference.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (22)
1. a controller for the power supply changeover device of adjustable jitter amplitude, comprises:
One feedback pin, receives a feedback voltage in order to the secondary side from this power supply changeover device, and wherein the output voltage of the secondary side of this feedback voltage and this power supply changeover device is relevant;
This controller is also characterised in that and comprises:
One logical circuit, in order to according to a frequency, this feedback voltage and one first resistance, produces a dither signal;
One auxiliary pin, in order to receive the voltage relevant for an auxiliary winding of this power supply changeover device; And
One current sense pin, in order to according to the electric current of the primary side of this power supply changeover device of flowing through, produces a detecting voltage;
Wherein this voltage, this dither signal and this detecting voltage are the opening times that determines the primary side of this power supply changeover device.
2. controller as claimed in claim 1, is characterized in that, this logical circuit comprises:
One first logical block, in order to according to this frequency, produces the digital signal with a pre-determined bit; And
One second logical block, in order to according to the digital signal of this feedback voltage, this pre-determined bit and this first resistance, produces this dither signal.
3. controller as claimed in claim 2, is characterized in that, in a cycle of this frequency, the digital signal of this pre-determined bit is to successively decrease gradually after increasing progressively gradually, or increases progressively gradually after successively decreasing gradually.
4. controller as claimed in claim 2, is characterized in that, this second logical block comprises:
One amplifier, has a first input end, in order to receive this feedback voltage, and one second input;
One variable resistor, is coupled to the second input of this amplifier; And
One switch, in order to according to the digital signal of this pre-determined bit, adjusts this variable-resistance resistance.
5. controller as claimed in claim 4, it is characterized in that, this second logical block is according to the digital signal of this feedback voltage, this pre-determined bit and this first resistance, produce this dither signal, be for this second logical block is according to this feedback voltage, this variable-resistance resistance and this first resistance, produce this dither signal.
6. controller as claimed in claim 1, is characterized in that, this first resistance is to be set by the bleeder circuit that is coupled to this auxiliary winding.
7. controller as claimed in claim 1, is characterized in that, this first resistance is to be set by the resistance that is coupled to this current sense pin.
8. controller as claimed in claim 1, is characterized in that, separately comprises:
One first comparator, in order to according to this voltage and a reference voltage, produces and exports a start signal to the power switch of the primary side of this power supply changeover device; And
One second comparator, in order to according to this dither signal and this detecting voltage, produces and exports a shutdown signal to this power switch.
9. a controller for the power supply changeover device of adjustable jitter amplitude, comprises:
One feedback pin, receives a feedback voltage in order to the secondary side from this power supply changeover device, and wherein the output voltage of the secondary side of this feedback voltage and this power supply changeover device is relevant;
This controller is also characterised in that and comprises:
One logical circuit, in order to according to the electric current of the primary side of a frequency and this power supply changeover device of flowing through, produces one and adjusts electric current;
One auxiliary pin, in order to receive the voltage relevant for an auxiliary winding of this power supply changeover device; And
One current sense pin, in order to adjust electric current according to this, produces a detecting voltage;
Wherein this voltage, this feedback voltage and this detecting voltage are the opening times that determines the primary side of this power supply changeover device.
10. controller as claimed in claim 9, is characterized in that, this logical circuit comprises:
One first logical block, in order to according to this frequency, produces the digital signal with a pre-determined bit; And
One second logical block, in order to according to the electric current of the primary side of the digital signal of this pre-determined bit and this power supply changeover device of flowing through, produces this adjustment electric current.
11. controllers as claimed in claim 10, it is characterized in that, in a cycle of this frequency, this second logical block is according to the digital signal of this pre-determined bit, this electric current that successively decreases gradually after increasing progressively gradually produces this adjustment electric current, or after successively decreasing gradually, increases progressively gradually this electric current and produce this adjustment electric current.
12. controllers as claimed in claim 9, is characterized in that, separately comprise:
One first comparator, in order to according to this voltage and a reference voltage, produces and exports a start signal to the power switch of the primary side of this power supply changeover device; And
One second comparator, in order to according to this feedback voltage and this detecting voltage, produces and exports a shutdown signal to this power switch.
13. controllers as described in claim 1 or 9, is characterized in that, separately comprise this frequency.
The controller of 14. 1 kinds of power supply changeover devices produces the method for adjustable jitter amplitude, this controller comprises a feedback pin, a logical circuit, a current sense pin and an auxiliary pin, wherein this logical circuit comprises one first logical block and one second logical block, and the method comprises:
This feedback pin receives a feedback voltage from the secondary side of this power supply changeover device, and wherein the output voltage of the secondary side of this feedback voltage and this power supply changeover device is relevant;
Also the method is characterized in that and comprise:
This logical circuit, according to a frequency, produces the digital signal with a pre-determined bit;
This auxiliary pin receives the voltage relevant for an auxiliary winding of this power supply changeover device;
This current sense pin, according to the electric current of the primary side of this power supply changeover device of flowing through, produces a detecting voltage; And
According to the digital signal of this voltage, this pre-determined bit and this detecting voltage, determine the opening time of the primary side of this power supply changeover device.
15. methods as claimed in claim 14, is characterized in that, in a cycle of this frequency, the digital signal of this pre-determined bit is to successively decrease gradually after increasing progressively gradually, or increases progressively gradually after successively decreasing gradually.
16. methods as claimed in claim 15, is characterized in that, according to the digital signal of this voltage, this pre-determined bit and this detecting voltage, determine that the opening time of the primary side of this power supply changeover device comprises:
This first logical block, according to this frequency, produces the digital signal with this pre-determined bit;
This second logical block, according to the digital signal of this pre-determined bit, is adjusted a variable-resistance resistance;
This second logical block, according to this feedback voltage, this variable-resistance resistance and one first resistance, produces a dither signal; And
According to this voltage, this dither signal and this detecting voltage, determine the opening time of the primary side of this power supply changeover device.
17. methods as claimed in claim 16, is characterized in that, this first resistance is to be set by the bleeder circuit that is coupled to this auxiliary winding.
18. methods as claimed in claim 16, is characterized in that, this first resistance is to be set by the resistance that is coupled to this current sense pin.
19. methods as claimed in claim 15, is characterized in that, this current sense pin, according to the electric current of the primary side of this power supply changeover device of flowing through, produces this detecting voltage and comprises:
This first logical block, according to this frequency, produces the digital signal with this pre-determined bit;
This second logical block, according to the electric current of the primary side of the digital signal of this pre-determined bit and this power supply changeover device of flowing through, produces this adjustment electric current; And
This current sense pin is adjusted electric current according to this, produces this detecting voltage.
20. methods as claimed in claim 19, it is characterized in that, according to the digital signal of this voltage, this pre-determined bit and this detecting voltage, determine the opening time of the primary side of this power supply changeover device, be for according to this voltage, this feedback voltage and this detecting voltage, determine the opening time of the primary side of this power supply changeover device.
21. methods as claimed in claim 19, it is characterized in that, in a cycle of this frequency, this second logical block is according to the digital signal of this pre-determined bit, this electric current that successively decreases gradually after increasing progressively gradually produces this adjustment electric current, or after successively decreasing gradually, increases progressively gradually this electric current and produce this adjustment electric current.
22. methods as described in claim 16 or 20, is characterized in that, this frequency is to be the frequency in this controller.
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| CN201310060456.2A CN104009640B (en) | 2013-02-26 | 2013-02-26 | Controller for power converter capable of adjusting jittering amplitude, and correlation method thereof |
| CN201710203242.4A CN107276413B (en) | 2013-02-26 | 2013-02-26 | The controller of the power adapter of adjustable jitter amplitude and its relevant method |
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| TWI580160B (en) * | 2015-11-19 | 2017-04-21 | Asian Power Devices Inc | Power protecting circuit and method thereof |
| CN106708160A (en) * | 2015-11-13 | 2017-05-24 | 亚荣源科技（深圳）有限公司 | Power output protection circuit and method |
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| US7215107B2 (en) * | 2005-07-11 | 2007-05-08 | Power Integrations, Inc. | Method and apparatus to limit output power in a switching power supply |
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Also Published As
| Publication number | Publication date |
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| CN107276413B (en) | 2019-10-18 |
| CN104009640B (en) | 2017-05-03 |
| CN107276413A (en) | 2017-10-20 |
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