CN104734542B - The power-supply controller of electric and the control method of correlation switched in the lowest point of voltage trough - Google Patents
The power-supply controller of electric and the control method of correlation switched in the lowest point of voltage trough Download PDFInfo
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Abstract
The power-supply controller of electric and the control method of correlation switched in the lowest point of voltage trough, it is adaptable to switch type power supplying device.The switch type power supplying device includes power switch.The power-supply controller of electric includes feedback pin, clamped circuit, peak detector, valley detection device and delay circuit.The feedback pin is electrically coupled to the assists winding of transformer.The clamped circuit is electrically connected to the feedback pin, and framework provides a strangulation electric current, with a voltage of the strangulation feedback pin.The peak detector is electrically connected to the clamped circuit, is used to produce a peak records, its to should strangulation electric current a peak value.The valley detection device is electrically connected to the feedback pin, and framework provides an entering signal, its start time point that may indicate that a voltage trough.The delay circuit framework come be used to the entering signal occur a time delay after, there is provided a trigger signal.The time delay changes with the peak records, and the trigger signal can open the power switch.
Description
Technical field
Technology disclosed in the present specification is broadly directed to the control of the power-supply controller of electric and correlation of switch type power supplying device
Method processed, more particularly to operable switch formula power supply unit is in the power supply of quasi-resonant mode (quasi-resonant mode)
Controller.
Background technology
Power supply changeover device is to plant the electric energy for battery or civil power are provided, and is converted into specific voltage or electricity
The electric energy of stream, correctly to provide electronic equipment appropriate electric energy.Now, electronic equipment is particular about and wants environment friendly very much, therefore,
The conversion efficiency of power supply changeover device is a very important problem.Refer to Power convert generally for the definition of conversion efficiency
The input electric energy of device is denominator, and the output electric energy to loading is molecule, resulting ratio.If power supply changeover device itself institute
The electric energy of consumption is lower, and conversion efficiency will be higher.The related industries of power supply supply, are all constantly devoted to pursuing higher
Conversion efficiency.
Whether in theory or actual result, the power supply changeover device operated under quasi-resonant mode is all proved
With quite good conversion efficiency.Fig. 1 shows the switch type power supplying device 10 being operable under quasi-resonant mode.
Bridge rectifier 20 provides full-wave rectification, by the AC power in commercial power socket, is converted into direct-current input power supplying
VIN.Direct-current input power supplying VINVoltage may have the waveform of similar English alphabet M, it is or substantially constant in a definite value.Power supply
Controller 26 can be the integrated circuit with many pins, and these pins can provide the unit that integrated circuit is electrically connected to periphery
Part.By driving pin GATE, switch power switchs 34 to power-supply controller of electric 26 periodically.When power switch 34 is opened, transformation
The main winding PRM of device starts energy storage；When power switch 34 is closed, transformer is by primary side winding SEC and assists winding AUX
Release energy, to set up out-put supply V respectivelyOUT(supplying electricity to load 24) and operation power VCC(supply electricity to power-supply controller of electric
26)。
Resistance 28 and 30 constitutes a divider to detect the cross-pressure V on assists winding AUXAUX, and in power-supply controller of electric
On 26 feedback pin FB, there is provided feedback voltage signal VFB。
Fig. 2 shows the waveform of some signals in Fig. 1.In time t0, drive the drive signal V on pin GATEGATEQuickly
Drop, close power switch 34, started shut-in time TOFF.Contact P between power switch 34 and main winding PRM
On have signal VP, its unexpected rising.Cross-pressure VAUX, its cross-pressure that can substantially map main winding PRM, in time t0Also suddenly become
Into on the occasion of.Because feedback voltage signal VFBGenerally ratio is in cross-pressure VAUX, so feedback voltage signal VFBIn time t0Also it is unexpected
Ground become on the occasion of.Transformer is from time t0, start to release energy.
When transformer is in time t1After having released energy completely, generally because parasitism on main winding PRM and contact P
The oscillating circuit that electric capacity is constituted, cross-pressure VAUXStart vibration.Cross-pressure V in Fig. 2AUXWaveform have three troughs VL1, VL2 with
And VL3.Here trough refers to cross-pressure VAUXWhen approximately less than 0V.As shown in Figure 2, trough VL3 is being not over
Before, shut-in time TOFFJust finish.Typically, operation opens power when the power-supply controller of electric meeting trough of quasi-resonant mode occurs
Switch 34, and this technology is also referred to as trough switching (valley switching).If power switch 34 is in cross-pressure VAUXIt is located at
Just it is unlocked during the bottommost of one trough, that signal VPIt is to be discharged since a region minimum value, so just can be with
Obtain less switch cost (switching loss).But, thing is always difficult so perfect.It is used for operating at present
The known control method of quasi-resonant mode, is mostly after trough starts, there is provided one section of fixed time delay (delay
time)Td, it is switched on a power switch.As Fig. 2 is illustrated, power switch 34 starts a time delay T in trough VL3d
Just it is unlocked afterwards.Here time delay TdA kind of result of design, when IC manufacturing out after, be exactly a fixation
Immutable constant.If time delay TdDo not choose, do not match with whole switch type power supplying device, that switching is damaged
Mistake would not be optimized.
The content of the invention
Embodiment is disclosed a kind of power-supply controller of electric, it is adaptable to a switch type power supplying device.The switch type power supplying
Device includes a power switch.The power-supply controller of electric includes a feedback pin, a clamped circuit, a peak detector, a ripple
Valley detector and a delay circuit.The feedback pin can be electrically coupled to an assists winding of a transformer.Clamped circuit electricity
It is connected to the feedback pin, framework provides a strangulation electric current, with a voltage of the strangulation feedback pin.Peak detector electricity
Be connected to the clamped circuit, be used to produce a peak records, its to should strangulation electric current a peak value.The valley detection device is electrically connected
It is connected to the feedback pin, framework provides an entering signal, its start time point that may indicate that a voltage trough.The delay
Circuit framework come be used to the entering signal occur a time delay after, there is provided a trigger signal.The time delay is with the peak
Value is recorded and changed, and the trigger signal can open the power switch.
Embodiment is disclosed a kind of power-supply controller of electric, it is adaptable to a switch type power supplying device.The switch type power supplying
Device includes a power switch.The power-supply controller of electric includes a feedback pin, a clamped circuit, a bottom detector, a ripple
Valley detector and a delay circuit.The feedback pin can be electrically coupled to an assists winding of a transformer.The assists winding
One voltage waveform of one cross-pressure can provide a voltage trough.The clamped circuit is electrically connected to the feedback pin, and framework is provided
One strangulation electric current, with the voltage in the strangulation feedback pin.The bottom detector framework provides a trough signal, and it is about
May indicate that the appearance of a lowest point of the voltage trough.The valley detection device is electrically connected to the feedback pin, and framework enters
Enter signal, to point out a start time point of the voltage trough.The delay circuit framework provides a reference signal.This is with reference to letter
Number to should start time point start to the lowest point to terminate between one optimization time delay.The delay circuit enters letter at this
Number occur a time delay after, there is provided a trigger signal.The time delay is no longer than the optimization time delay.The trigger signal
The power switch can be opened.
Embodiment discloses a kind of control method for being applied to a switch type power supplying device.The switch type power supplying device bag
Contain a transformer and a power switch.The control method includes：A strangulation electric current is provided, with the feedback pin of strangulation one
A voltage, wherein, the feedback pin is electrically connected to an assists winding of the transformer, and the assists winding by a resistance
A cross-pressure one voltage trough can be provided；A peak records are produced, its peak value for being generally corresponding to the strangulation electric current；One is provided to enter
Enter signal, its start time point that may indicate that the voltage trough；According to the peak records, there is provided a lowest point signal, its is big
About may indicate that the appearance of a lowest point of the voltage trough；One reference signal is provided, its to should start time point start to the paddy
An optimization time delay between bear building-up beam；And, it is enabled in the lowest point signal, it is indicated that when the lowest point starts, there is provided one
Trigger signal, it can open the power switch.The start time point to the trigger signal be provided between a time delay, no
It is longer than optimization time delay.
Brief description of the drawings
Fig. 1 shows the switch type power supplying device 10 being operable under quasi-resonant mode.
Fig. 2 shows the waveform of some signals in Fig. 1.
The power-supply controller of electric that Fig. 3 citings are implemented according to the present invention.
Fig. 4 citing FB clamped circuits.
Fig. 5 citing peak detectors.
Bottom detector in Fig. 6 exemplary graphs 3.
Delay circuit in Fig. 7 exemplary graphs 3.
When the power-supply controller of electric 26 that Fig. 8 shows in Fig. 1 is replaced by the power-supply controller of electric 60 in Fig. 3, some of them letter
Number waveform.
【Symbol description】
10 switch type power supplying devices
20 bridge rectifiers
24 loads
26 power-supply controller of electric
28 resistance
30 resistance
34 power switch
60 power-supply controller of electric
62 FB clamped circuits
64 peak detectors
65 valley detection devices
66 depart from detector
68 enter detector
70 bottom detectors
72 delay circuits
74 peak frequency limiters
76 opening time controllers
80 SR registers
90 NMOS
92 NMOS
94 comparators
96 SR registers
AUX assists windings
FB feedback pins
GATE drives pin
ICLMPStrangulation electric current
P contacts
PRM main windings
SBOTTOMThe lowest point signal
SEXITSeparating signal
SEC primary side windings
SMAX-FObstruction signal
SP-GATESignal
SQRDEntering signal
SQRD-TDTrigger signal
t0、t1、t00、t01、t02、t03、t04、t05、t06、t07、t08、t09、t10Time
TdTime delay
TD-NEWTime delay
TMOptimize time delay
TOFFShut-in time
TONOpening time
VADetection voltage
VAUXCross-pressure
VCCOperation power
VDReference voltage
VFBFeedback voltage signal
VGATEDrive signal
VINInput power
VL1, VL2, VL3 trough
VOUTOut-put supply
VPSignal
VPEAKPeak records
VTDRamp signal
Specific embodiment
The power-supply controller of electric 60 that Fig. 3 citings are implemented according to the present invention.Hereinafter Fig. 1 will be replaced with power-supply controller of electric 60
In power-supply controller of electric 26, the operation of power-supply controller of electric 60 is explained as one embodiment of the invention.Power-supply controller of electric 60 can
To perform trough switching, and it is in cross-pressure VAUXWhen about positioned at the bottom of a voltage trough, a power switch is opened.Cause
This, in some embodiments of the invention, switch cost be able to may be minimized.
Power-supply controller of electric 60 has FB clamped circuits 62, peak detector 64, valley detection device 65, bottom detector 70, prolongs
Slow circuit 72, peak frequency limiter 74 and opening time controller 76.Power supply control in the substitution Fig. 1 of power-supply controller of electric 60
During device 26 processed, feedback pin FB is electrically connected to assists winding AUX by resistance 30.
The framework of opening time controller 76 resets SR registers (register) 80, and forbidden energy driven on pin GATE
Drive signal VGATE, thereby begin to shut off time TOFF.In certain embodiments, opening time TONLength, that is, drive letter
Number VGATEThe time span being enabled, depending on detection in an output end (for example out-put supply V in Fig. 1OUT) on voltage or
It is a signal produced by electric current.
As cross-pressure VAUXWhen being negative value, FB clamped circuits 62 provide a strangulation electric current ICLMP, for strangulation feedback voltage signal
VFBIn 0V.FB clamped circuits 62 also provide ratio in strangulation electric current ICLMPA detection voltage VATo peak detector 64.Peak value
The trace detection voltage V of detector 64A, then produce a peak records VPEAK, correspond approximately to detection voltage VAA peak value.For
The peak value in subsequent voltage trough, at the end of a voltage trough, separating signal S can be followed the trail ofEXITCan be enabled, cause
Peak records VPEAKIt is reduced a little.Will illustrate after a while, when voltage trough is deeper, peak records VPEAKWill be bigger.
Valley detection device 65 has one to enter the disengaging detector 66 of detector 68 and.Be not limited to it is of the invention
In this example, when closed between TOFFIt is interior, as feedback voltage signal VFBFall during less than 0.1V, it is short to send out one into detector 68
Pulse, as an entering signal SQRDTo point out a start time point of a voltage trough.It is opposite, when closed between TOFFIt is interior,
As feedback voltage signal VFBWhen increasing above 0.3V, depart from detector 66 and be issued by another short pulse, as a separating signal
SEXITTo point out an end time point of the voltage trough.Here 0.3V and 0.1V is merely possible to for example, can be with
The hobby in design and replaced with other numerical value.In certain embodiments, a start time point of a voltage trough can be
In detection voltage VAWhen more than a particular value, and an end time point of a voltage trough can be detection voltage VAReduce
When to less than another particular value.
Bottom detector 70 compares peak records VPEAKWith detection voltage VA, to provide a lowest point signal SBOTTOM, apply greatly
To point out the appearance of a lowest point of a voltage trough.It is apprehensible, just because of peak records VPEAKThe about detection electricity of record
Pressure VAPeak value, and the certain the lowest point for occurring from a voltage trough of this peak value, therefore, if a follow-up voltage trough
Detection voltage VAVery close to peak records VPEAKWhen, that is, represent that a lowest point of this follow-up voltage trough probably occurs in that,
So the lowest point signal SBOTTOMJust it is enabled.
In entering signal SQRDA time delay T after appearanceD-NEWAfterwards, delay circuit 72 provides a trigger signal SQRD-TD。
As shown in Figure 3, trigger signal SQRD-TDSR registers 80 can be set, and enable drives the drive signal V on pin GATEGATE,
To open a power switch.With fixed delay time T of the prior artdIt is different, time delay T hereinD-NEWNot
It is a definite value, but may be with the lowest point signal SBOTTOMAnd change.For example, time delay TD-NEWMay be in the lowest point
Signal SBOTTOMWhen being enabled, just unexpected termination.Such as peak records VPEAKThe peak of subsequent voltage trough can substantially have been followed the trail of
Value, therefore, the lowest point signal SBOTTOMThe time point being enabled may as different voltage troughs is without the same, therefore, postpone
Time TD-NEWLength will change.To explain after a while, this time delay TD-NEWCan be considered as or for predicting a voltage
The time point that one the lowest point of trough occurs, therefore can be used to open a power switch, when using reduction by one power switch of switch
Switch cost.
Peak frequency limiter 74 provides an obstruction signal SMAX-F, to prevent trigger signal SQRD-TDOpen a power switch.
For example, obstruction signal SMAX-FOnly after switch periods are more than 16us, can just be enabled, so can just limit a switching regulator
The switching frequency of power supply unit is not above 60KHz.
Fig. 4 citing FB clamped circuits 62, wherein NMOS90 has a gate electrode to be probably biased in voltage Vnth, and voltage VnthIt is
The critical voltage (threshold voltage) of NMOS90.If cross-pressure VAUXIt is negative value, NMOS90 can automatically provide strangulation
Electric current ICLMP, approximately strangulation feedback voltage signal VFBIn 0V.According to strangulation electric current ICLMP, current mirror in Fig. 4 provides one and reflects
Radio stream, flows it through a resistance to produce detection voltage VA。
Fig. 5 citing peak detectors 64, wherein, as peak records VPEAKThan detection voltage VAHour, NMOS92 is to an electric capacity
Charge with lifting peak records VPEAK, therefore can be with trace detection voltage VARising.As peak records VPEAKBecome equal to or
It is than detection voltage VAWhen big, electric capacity is just no longer electrically charged.Therefore, peak records VPEAKDetection voltage V can be representedAA peak
Value.If a voltage the lowest point is deeper, represent that the lowest point of this voltage trough is more negative, strangulation electric current ICLMPPeak value be accomplished by more great talent
Can strangulation live in feedback voltage signal VFB, so peak records VPEAKCan be bigger.Separating signal SEXITIt can be pointed out that the voltage wave
End time point of paddy, and can be used for making the electric capacity discharge little by little, use at the end of a voltage trough, reduction slightly
Peak records VPEAK。
Bottom detector 70 in Fig. 6 exemplary graphs 3.As described above, detection voltage VAVery close to peak records VPEAK
When, the lowest point signal SBOTTOMCan be enabled.In figure 6, comparator 94 compares detection voltage VAWith peak records VPEAK, and compare
Device 94 may there are an offset voltage (offset volta in certain one end of its two inputge).For example, detection is worked as
Voltage VAWith the summation of 0.1V, peak records V is increased abovePEAKWhen, SR registers 96 are just set, enable the lowest point signal
SBOTTOMTo declare the beginning of a lowest point of a voltage trough.Similar, as detection voltage VAWith the summation of 0.1V, drop to and be less than
Peak records VPEAKWhen, SR registers 96 are just reset, forbidden energy the lowest point signal SBOTTOMTo declare a lowest point of a voltage trough
End.In figure 6, with drive signal S on equivalentGATEIdentical signal SP-GATE, can be used to reset SR registers 96, because
Opening time TONBeginning, be equal to the end of a lowest point.
Delay circuit 72 in Fig. 7 exemplary graphs 3.Entering signal SQRDRamp signal V is resetTD, it is increased since 0V
Rise.Therefore, ramp signal VTDRepresent the time passed after voltage trough starts.Reference voltage VDRepresent an optimization
Time delay TM.Comparator in Fig. 7 can be secondly tune voltage (not shown) be lost in certain one end in input.Citing comes
Say, as ramp signal VTDLess than reference voltage VD, but with reference voltage VDDifference when being not more than a default offset voltage, one
Short pulse will act as trigger signal SQRD-TDAnd be sent.In other words, if a voltage trough starts the rear time for being passed
Reference voltage V is arrivedDCorresponding optimization time delay TM, trigger signal SQRD-TDCan be enabled and have a short pulse, this is short
Pulse may can open a power switch.This optimizes time delay TMAfter limiting since the voltage trough, to delay
When circuit 72 really sends out short pulse, actual time delay TD-NEW.If reference voltage VDWithout renewal or change, that
Quite determine, time delay TD-NEWOptimization time delay T can never be longer thanM。
As the lowest point signal SBOTTOMWhen being enabled, ramp signal VTDUpdate reference voltage VD.For example, reference voltage VD
Be updated with ramp signal V instantlyTDEqually.Meanwhile, trigger signal SQRD-TDCan be enabled and have a short pulse, cause to prolong
Slow time TD-NEWThan optimizing time delay TMThat comes is short.Reference voltage VDCan finally have recorded, in the lowest point signal SBOTTOMIt is banned
During energy, that is, that moment terminated in a voltage trough, ramp signal VTDValue.
When the power-supply controller of electric 26 that Fig. 8 shows in Fig. 1 is replaced by the power-supply controller of electric 60 in Fig. 3, some of them letter
Number waveform.
In time t00When, drive signal VGATEIt is disabled, signal VP, cross-pressure VAUXAnd feedback voltage signal VFBIt is all rapid
Ground rises, and has started shut-in time TOFF。
After transformer discharges completely, signal VPWith cross-pressure VAUXStart vibration.In time t01、t05With t09When, cross-pressure VAUX
It is negative value almost to drop to, so entering signal SQRDShort pulse is occurred as soon as, opening for voltage trough VL1, VL2 and VL3 has been pointed out respectively
Begin.Similar, in time t04With t07, cross-pressure VAUXRise to about on the occasion of separating signal SEXITShort pulse is occurred as soon as, has been used
To point out the end of voltage trough VL1 and VL2.
As shown in Figure 8, with time t02To t03Between period as a example by, peak records VPEAKTrace detection voltage VA。
But, if detection voltage VAWhen being reduced the peak value of oneself, peak records VPEAKRemain unchanged.Voltage trough VL1 with
(time t at the end of VL204With t07), via separating signal SEXITTriggered, peak records VPEAKOne is reduced because electric capacity discharges
Point point.
With time t02To t03Between period as a example by, now the lowest point signal SBOTTOMIt is enabled, because detection voltage VAIt is equal to
Or very close to peak records VPEAK。
Ramp signal VTDFrom time t01Beginning is begun to ramp up with a fixed slope.In time t02, the lowest point signal SBOTTOMQuilt
Enable, so reference voltage VDBy ramp signal VTDUpdated.Reference voltage VDRenewal until the lowest point signal SBOTTOMWhen
Between t03Just stop after being disabled.In time t02, as reference voltage VDFor the first time be updated with ramp signal VTDWhen the same, touch
Signalling SQRD-TDJust it is enabled and produces a short pulse, as shown in Figure 8.But, drive signal VGATEStill rest on banned
Can, because obstruction signal SMAX-FInstantly it is disabled.Therefore, time delay T produced in voltage trough VL1D-NEWBe from
t01To t02Time, be generally by the lowest point signal SBOTTOMDetermined, and the lowest point signal SBOTTOMAccording to peak records VPEAKAnd
Produce.Since voltage trough, to the lowest point signal SBOTTOMThis period untill being disabled, referred to as optimize time delay
TM.Optimize time delay TMBy reference voltage VDRemembered, so reference voltage VDCorrespond to optimization time delay TM。
Above in the time of voltage trough VL1 signal produce with explanation, it is also possible to be extrapolated to voltage trough VL2 when
Interior signal is produced and explanation.
Such as the lowest point signal S in Fig. 8BOTTOMWaveform shown, the lowest point signal SBOTTOMIt is the time span of enable,
Will be shorter and shorter in follow-up voltage trough.Because detection voltage VAPeak value can be with the increase of voltage trough
And reduce, although and peak records VPEAKReduction at the end of each voltage trough slightly, but peak records VPEAKBut cannot and
When forereach detection voltage VAPeak-fall speed.As shown in Figure 8, for from time t09The voltage trough VL3 of beginning
For, the lowest point signal SBOTTOMIt is the time span of enable, is wholly absent, because peak records VPEAKAlways all higher than detection electricity
Pressure VA.Simply, in time t10, trigger signal SQRD-TDStill it is enabled, because ramp signal VTDIt has been increased beyond reference voltage
VD, and reference voltage VDMemory is had been updated in previous voltage trough and optimizes time delay TM.Note that it is main around
Group PRM has a built-in oscillation cycle with the oscillating circuit that parasitic capacitance is constituted, and optimizes time delay TMDating greatly is
The a quarter of this cycle of oscillation, and optimize time delay TMFor each voltage trough, probably it is just as.This
It is also why each in Fig. 8 optimizes time delay TMAll about the same the reason for.If trigger signal SQRD-TDCan be with
Just start to optimize time delay T in a voltage troughMAfter be enabled, that quasi-resonant mode is almost perfect execution,
The switch cost that can be optimized.What Fig. 8 showed is exactly such result, the time delay in wherein voltage trough VL3
TD-NEWIt is exactly with optimizing time delay TMJust.Trigger signal SQRD-TDIn time t10It is enabled, now obstruction signal
SMAX-FIt has been be enabled that, so drive signal VGATEJust and then it is enabled, in time t10Open power switch.
Because in trigger signal SQRD-TDSecond short pulse occur after time t08, obstruction signal SMAX-FJust caused
Can, so Fig. 8 is shown the trough switching in tertiary voltage trough VL3.Certainly, as long as obstruction signal SMAX-FCan earlier by
Enable, it is possible to realize implementing trough switching in first or second voltage trough (VL1 or VL2).As an example it is assumed that blocking
Signal SMAX-FTime t in fig. 8 ahead of time01Just it is enabled, that can be with inference, after living through several switch periods, peak
Value record VPEAKWill because of signal propagation delay the reason for, finally can about stablize very close to detection voltage VAFirst
Near individual peak value.Just because of peak records VPEAKWith detection voltage VAFirst peak value it is about the same, so time delay
TD-NEWCan substantially with optimizing time delay TMEqually, optimized switch cost has also been reached.
With time delay T fixed in the prior artdIt is different, the time delay T in embodiments of the inventionD-NEWAccording to
According to the lowest point signal SBOTTOMAnd adaptively change, the lowest point signal SBOTTOMCan be with peak records VPEAKAnd adjust.More than
Teaching and analysis, the time that the lowest point of a voltage trough occurs can get up by memory, therefore be implemented according to the present invention
One power-supply controller of electric can realize that trough switches in a kind of optimized mode, reduce the switch cost of power switch.
The foregoing is only the preferred embodiments of the present invention, all impartial changes done according to claims of the present invention with repair
Decorations, should all belong to covering scope of the invention.
Claims (20)
1. a kind of power-supply controller of electric, it is adaptable to which a switch type power supplying device, it includes a power switch, the power-supply controller of electric
Include：
One feedback pin, can be electrically coupled to an assists winding of a transformer；
One clamped circuit, is electrically connected to the feedback pin, and framework provides a strangulation electric current, with an electricity of the strangulation feedback pin
Pressure；
One peak detector, is electrically connected to the clamped circuit, according to the strangulation electric current, is used to produce a peak records, its correspondence
One peak value of the strangulation electric current；
One valley detection device, be electrically connected to the feedback pin, and framework provides an entering signal, and it may indicate that a voltage trough
A start time point；And
One delay circuit, framework come be used to the entering signal occur a time delay after, there is provided a trigger signal, wherein, should
Time delay changes with the peak records, and the trigger signal can open the power switch.
2. power-supply controller of electric as claimed in claim 1, wherein, the clamped circuit provides a detection electricity according to the strangulation electric current
Pressure, the peak detector follows the trail of a peak value of the detection voltage, to provide the peak records.
3. power-supply controller of electric as claimed in claim 2, also includes a bottom detector, and its framework compares the detection voltage
And the peak records, to provide a lowest point signal, the appearance of its lowest point for pointing out the voltage trough about.
4. power-supply controller of electric as claimed in claim 3, wherein, the time delay determines according to the lowest point signal.
5. power-supply controller of electric as claimed in claim 4, wherein, the delay circuit compares a ramp signal and a reference signal,
To determine the time delay, and when the lowest point signal is enabled, the reference signal updates.
6. power-supply controller of electric as claimed in claim 5, wherein, when the entering signal is enabled, the ramp signal is reset.
7. power-supply controller of electric as claimed in claim 1, wherein, the valley detection device is provided a separating signal by framework, its
Represent an end time point of the voltage trough.
8. power-supply controller of electric as claimed in claim 7, wherein, when the separating signal is enabled, peak detector reduction
The peak records.
9. power-supply controller of electric as claimed in claim 1, also includes：
One peak frequency limiter, is used to provide an obstruction signal, to prevent the trigger signal from opening the power switch, therefore can
To limit the switching frequency of the switch type power supplying device.
10. a kind of power-supply controller of electric, it is adaptable to which a switch type power supplying device, it includes a power switch, the power supply
Device includes：
One feedback pin, can be electrically coupled to an assists winding of a transformer, wherein, a voltage of a cross-pressure of the assists winding
Waveform can provide a voltage trough；
One clamped circuit, be electrically connected to the feedback pin, and framework provides a strangulation electric current, with the strangulation feedback pin
Voltage；
One bottom detector, framework comes according to the strangulation electric current, there is provided a trough signal, and it about may indicate that the voltage trough
The appearance of one the lowest point；
One valley detection device, be electrically connected to the feedback pin, and framework provides an entering signal, to point out the one of the voltage trough
Start time point；And
One delay circuit, framework provides a reference signal, the reference signal to should start time point start to the lowest point to tie
An optimization time delay between beam, and after a time delay occurs in the entering signal, there is provided a trigger signal；
Wherein, the time delay is no longer than the optimization time delay；And
The trigger signal can open the power switch.
11. power-supply controller of electric as claimed in claim 10, also include：
One peak detector, is electrically connected to the clamped circuit, is used to produce a peak records, its to should strangulation electric current a peak
Value；
Wherein, the trough signal is provided according to the strangulation electric current.
12. power-supply controller of electric as claimed in claim 11, wherein, the clamped circuit provides a detection electricity according to the strangulation electric current
Pressure, the peak detector follows the trail of a peak value of the detection voltage, to provide the peak records.
13. power-supply controller of electric as claimed in claim 12, wherein, the bottom detector compares the peak records and the detection
Voltage provides the trough signal.
14. power-supply controller of electric as claimed in claim 10, wherein, the delay circuit compares a ramp signal to be believed with the reference
Number determine the time delay.
15. power-supply controller of electric as claimed in claim 14, wherein, when the lowest point occurs, the delay circuit uses the slope
Signal updates the reference signal.
16. power-supply controller of electric as claimed in claim 10, wherein, the valley detection device framework provides a separating signal, its
Represent an end time point of the voltage trough.
A kind of 17. control methods for being applied to a switch type power supplying device, the switch type power supplying device includes a transformation
Device and a power switch, the control method include：
One strangulation electric current is provided, with the voltage in the feedback pin of strangulation one, wherein, the feedback pin is electrically connected by a resistance
An assists winding of the transformer is connected to, and a cross-pressure of the assists winding can provide a voltage trough；
According to the strangulation electric current, a peak records, its peak value for being generally corresponding to the strangulation electric current are produced；
An entering signal is provided, its start time point that may indicate that the voltage trough；
According to the peak records, there is provided a lowest point signal, the appearance of its lowest point that about may indicate that the voltage trough；
One reference signal is provided, its to should start time point start to the lowest point to terminate between one optimization time delay；
And
It is enabled in the lowest point signal, it is indicated that when the lowest point starts, there is provided a trigger signal, it can open the power switch；
Wherein, the start time point to the trigger signal be provided between a time delay, be no longer than the optimization delay
Time.
18. control methods as claimed in claim 17, also include：
According to the entering signal, there is provided a ramp signal；And
When the lowest point occurs, the reference signal is updated with the ramp signal.
19. control methods as claimed in claim 18, include：
According to the strangulation electric current, there is provided a detection voltage；
The detection voltage is followed the trail of, to provide the peak records；And
Compare the detection voltage with the peak records to produce the lowest point signal.
20. control methods as claimed in claim 18, include：
A separating signal is provided, its end time point for representing the voltage trough；And
According to the separating signal, the peak records are reduced.
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| CN201310731520.5A CN104734542B (en) | 2013-12-18 | 2013-12-18 | The power-supply controller of electric and the control method of correlation switched in the lowest point of voltage trough |
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| CN110247553B (en) * | 2018-03-09 | 2020-11-06 | 台达电子工业股份有限公司 | Converter and control method thereof |
| CN113328634A (en) * | 2021-05-19 | 2021-08-31 | 深圳市必易微电子股份有限公司 | Switch control circuit, switch control method and switch power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557171A (en) * | 2008-04-11 | 2009-10-14 | 崇贸科技股份有限公司 | Switching control circuit |
| CN102082521A (en) * | 2010-10-29 | 2011-06-01 | 西安英洛华微电子有限公司 | Circuit for accurately detecting resonance trough |
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| TW200824240A (en) * | 2006-11-24 | 2008-06-01 | Richtek Technology Corp | A waveform valley estimation circuit of a switching component and the method thereof |
| US20120320632A1 (en) * | 2011-06-20 | 2012-12-20 | Shamrock Micro Devices Corp. | Power switch controllers and methods used therein for improving conversion effeciency of power converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557171A (en) * | 2008-04-11 | 2009-10-14 | 崇贸科技股份有限公司 | Switching control circuit |
| CN102082521A (en) * | 2010-10-29 | 2011-06-01 | 西安英洛华微电子有限公司 | Circuit for accurately detecting resonance trough |
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