CN102739031A - Discontinuous power factor correction switching controller adapted for fixed power supply time of sawtooth wave - Google Patents
Discontinuous power factor correction switching controller adapted for fixed power supply time of sawtooth wave Download PDFInfo
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- CN102739031A CN102739031A CN2011100817038A CN201110081703A CN102739031A CN 102739031 A CN102739031 A CN 102739031A CN 2011100817038 A CN2011100817038 A CN 2011100817038A CN 201110081703 A CN201110081703 A CN 201110081703A CN 102739031 A CN102739031 A CN 102739031A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a discontinuous power factor correction switching controller adapted for fixed power supply time of a sawtooth wave, comprising an error amplifier which includes a negative input end to which a feedback signal is coupled, a positive input end to which a reference voltage is coupled, and an output end used for providing a critical signal; an adaptation current source generator used for generating an adaptation current source based on the critical signal; a capacitor used for bearing a sawtooth wave by taking the adaptation current source as a charging source; a switch used for discharging the capacitor based on the control on a reset signal; a comparator which includes a negative input end to which the critical signal is coupled, a positive input end to which the sawtooth wave is coupled, and an output end used for providing a shutoff signal; and a fixed-on-time drive circuit used for providing a drive signal and the reset signal based on the shutoff signal and a sensing signal.
Description
Technical field
The invention relates to switch controller of power supply, particularly relevant for fixedly power-on time (fixed-on-time) controller that is applied to discontinuous formula (discontinuous mode) PFC (Power Factor Correction-merit is because of revising) electric energy conversion.
Background technology
The fixing power source conversion of power-on time can provide good merit because of correction effect when input supply voltage tool current waveform in full-wave rectifier and power source conversion pattern are discontinuous formula.Its reason is following:
Order input power supply is V
IN(t)=| V
ASin (ω t) |, fixedly power-on time is t
ON, inductance value is L, and the input current of ending in power-on time is I
INPEAK(t
X), I then
INPEAK(t
X)=(V
IN(t
XThe t of)/L)
ON=(| V
ASin (ω t
X) |/L) t
ON, t wherein
ONMuch smaller than 2 π/ω.
Can know that by following formula because input current can be followed the input power source voltage during each power supply, this power source conversion is to obtain good merit factor values.
Understand the operation principle of the fixing discontinuous PFC power source conversion of power-on time, please with reference to Fig. 1, it illustrates and comprises an existing fixedly calcspar of the discontinuous PFC power supply changeover device of power-on time controller.As shown in Figure 1, this discontinuous PFC power supply changeover device comprises fixedly power-on time controller 110 of an input rectification circuit 101, a transformer circuit 102, an output rectification circuit 103, a load 104, a resistance 105 and one.
Input rectification circuit 101 is in order to comply with an AC power V
ACProduce a full-wave rectified voltage V
FULL_WAVE
Transformer circuit 102 is in order at a fixing drive signal V of power-on time controller 110
DRVControl under, with electric energy by full-wave rectified voltage V
FULL_WAVEReach output rectification circuit 103.
Output rectification circuit 103 is in order to a direct current output voltage V to be provided
OTo load 104, and resistance 105 is in order to a feedback signal V to be provided
FBTo fixing power-on time controller 110.
Fixedly power-on time controller 110 comprises fixedly power-on time drive circuit 116 of an error amplifier 111, a constant current source 112, an electric capacity 113, a switch 114, a comparator 115 and.
Error amplifier 111 has a negative input end to couple this feedback signal V
FB, a positive input terminal is to couple a reference voltage V
REF, and an output is to provide a minimum detectable signal V
COMP
Constant current source 112, electric capacity 113 and switch 114 are in order to produce a sawtooth waveforms V
SW
Comparator 115 has a negative input end to couple this minimum detectable signal V
COMP, a positive input terminal is to couple this sawtooth waveforms V
SW, and an output is to provide a cut-off signals V
OFF
Fixedly power-on time drive circuit 116 is in order to comply with the cut-off signals V from comparator 115
OFFAnd from a sensing signal V of transformer circuit 102
AUXFor transformer circuit 102 provides this drive signal V
DRVAnd for switch 114 a reset signal RESET is provided, this sensing signal V wherein
AUXBe the time point that finishes in order to the inductive current discharge of pointing out transformer circuit 102, some action time of this reset signal RESET then follows this cut-off signals V
OFFAction time point after.
When operation, this drive signal V
DRVVoltage can be at this sensing signal V
AUXRise to a high potential by an electronegative potential after becoming active state, and at this cut-off signals V
OFFDrop to an electronegative potential by a high potential after becoming active state.In addition, this drive signal V
DRVMaintain high potential during-power-on time-meeting of transformer circuit 102 is fixed on a numerical value by the back coupling controlling mechanism of power source conversion, with in each change-over period with the energy of specific size by this AC power V
ACReach load 104, thereby with V
FBRegulation and control are at V
REF
Yet, because this drive signal V
DRVMaintain high potential during-be a fixing power-on time of transformer circuit 102, by a load value and this AC power V of load 104
ACA line voltage determine-be at this sawtooth waveforms V
SWTouch this minimum detectable signal V
COMPIn time, finish, this minimum detectable signal V
COMPSatisfying can be at load value or this AC power V of load 104
ACLine voltage significantly to move the position when huge change is arranged accurate, with will said fixedly power-on time by one short/become between a length/short-term between for a long time.
Please with reference to Fig. 2, it illustrates the existing fixedly power-on time controller of Fig. 1 110 itself and this AC power V
ACLow line voltage and the corresponding respectively main signal waveforms of a high line voltage.As shown in Figure 2, V
DRV, LOW_LINE(according to this AC power V
ACThe drive signal V that produces of a low line voltage
DRV) have a fixing power-on time t
ON1, and V
DRV, HIGH_LINE(according to this AC power V
ACThe drive signal V that produces of a high line voltage
DRV) have a fixing power-on time t
ON2, wherein, because identical power can be delivered to load 104, t
ON1Be to be longer than t
ON2Because said fixedly power-on time is in this sawtooth waveforms V
SW-its slope that climbs is to determine-touch this minimum detectable signal V by fixed current source 112
COMPIn time, finish, and said fixedly power-on time is to be controlled by this minimum detectable signal V
COMPAccurate position.Therefore, a higher V
COMP, LOW_LINE(with this AC power V
ACThe corresponding minimum detectable signal V of said low line voltage
COMP) produced to cause a higher V
SW, LOW_LINE(with this AC power V
ACThe corresponding sawtooth waveforms V of said low line voltage
SAW), thereby produce said long t
ON1An and lower V
COMP, HIGH_LINE(with this AC power V
ACThe corresponding minimum detectable signal V of said high line voltage
COMP) produced to cause a lower V
SW, HIGH_LINE(with this AC power V
ACThe corresponding sawtooth waveforms V of said high line voltage
SAW), thereby produce said short t
ON2, V wherein
COMP, LOW_LINECompare V
COMP, HIGH_LINEExceed Δ V
1
That is, the existing fixedly Δ V of power-on time controller 110
1Load value or this AC power V in load 104
ACLine voltage can become a big numerical value when huge change is arranged.Yet, big Δ V
1Can be unfavorable for the design of error amplifier 111.For making Δ V
1Minimization, a solution are to change the capacitance of electric capacity 113 to deal with this AC power V
ACThe load value of amplitude variations or load 104 change.Yet, at this AC power V
ACOr load 104 changes electric capacity 113 when being changed, and is very irritating program; Moreover this solution can be unfavorable for electric capacity 113 and the fixedly integration of power-on time controller 110.
Summary of the invention
Because aforesaid problem, the present invention is the fixedly power-on time controller that proposition is applied to a novelty of discontinuous formula PFC electric energy conversion.
A purpose of the present invention is to disclose a fixing power-on time controller that is applied to the conversion of discontinuous formula PFC electric energy, and wherein being adapted to a sawtooth waveforms that input ac power amplitude variations or load value change can be by generation to relax this fixedly performance requirement of an error amplifier in the power-on time controller.
Another object of the present invention is to disclose a fixing power-on time controller that is applied to the conversion of discontinuous formula PFC electric energy, wherein be adapted to a sawtooth waveforms that input ac power amplitude variations or load value change and can be by generation can be incorporated into this fixedly in the power-on time controller so that carry an electric capacity of this sawtooth waveforms.
For reaching aforementioned purpose, one with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time be to be suggested because of revising switching controller, this controller comprises:
One error amplifier has a negative input end coupling a feedback signal, and a positive input terminal is coupling a reference voltage, and an output is to provide a minimum detectable signal;
One adapts to current source generator, adapts to current source in order to produce one according to this minimum detectable signal, wherein this adaptation current source be with this minimum detectable signal step-down/height become greatly/little;
One electric capacity is the charging source with this adaptation current source, in order to carry a sawtooth waveforms;
One switch, in order under the control of a reset signal with this capacitor discharge;
One comparator has a negative input end coupling this minimum detectable signal, and a positive input terminal is coupling this sawtooth waveforms, and an output is to provide a cut-off signals; And
One fixing power-on time drive circuit; In order to according to one drive signal being provided and this reset signal being provided for this switch for this external transformer circuit from the said cut-off signals of this comparator and from a sensing signal of an external transformer circuit; Wherein this sensing signal is the time point that finishes in order to the inductive current discharge of pointing out this external transformer circuit, and some action time of this reset signal then follows the action time of this cut-off signals after the point.
Description of drawings
Fig. 1 illustrates and comprises an existing fixedly calcspar of the discontinuous PFC power supply changeover device of power-on time controller.
Fig. 2 illustrates existing fixedly power-on time controller itself and this AC power V of Fig. 1
ACLow line voltage and the corresponding respectively main signal waveforms of a high line voltage.
Fig. 3 illustrate the present invention with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time because of revising the calcspar of switching controller one of which preferred embodiment.
Fig. 4 illustrates a preferred embodiment that adapts to current source generator among Fig. 3.
Fig. 5 illustrates Fig. 3 controller, and it hangs down line voltage AC power and the corresponding respectively main signal waveforms of a high line voltage AC power with one.
Embodiment
For making your juror can further understand structure of the present invention, characteristic and purpose thereof, attach now with the detailed description of graphic and preferred embodiment as after.
Please with reference to Fig. 3, its illustrate the present invention fixedly power-on time controller 210-to adapt to the calcspar of the fixing discontinuous merit of sawtooth waveforms because of power-on time-one of which preferred embodiment of revising conversion.As shown in Figure 3, fixedly power-on time controller 210 comprises that an error amplifier 211, adapts to fixedly power-on time drive circuit 216 of current source generator 212, an electric capacity 213, a switch 214, a comparator 215 and.
Error amplifier 211 has a negative input end to couple a feedback signal V
FB, a positive input terminal is to couple a reference voltage V
REF, and an output is to provide a minimum detectable signal V
COMP
Adapting to current source generator 212 is in order to comply with this minimum detectable signal V
COMPProduce one and adapt to current source I
S, wherein should adapt to current source I
SBe with this minimum detectable signal V
COMPStep-down/height and become big/little.Please with reference to Fig. 4, it illustrates a preferred embodiment that adapts to current source generator 212.As shown in Figure 4, adapt to current source generator 212 and comprise a transduction operational amplifier (Operational Transconductance Amplifier OTA) 2121, it has a negative input end to couple this minimum detectable signal V
COMP, a positive input terminal is to couple one first reference voltage V
REF1, and an output is to provide this adaptation current source I
S=I
S0+ G
m(V
REF1-V
COMP), I wherein
S0Be a quiescent current, and G
mTransduction for transduction operational amplifier 2121.
Electric capacity 213 adapts to current source I through this
SCharging is in order to carry a sawtooth waveforms V
SWElectric capacity 213 is preferably and is incorporated into fixedly in the power-on time controller 210, but it also can be according to becoming an outer member.
Switch 214 is in order under the control of a reset signal RESET, to make electric capacity 213 discharges.
Comparator 215 has a negative input end to couple this minimum detectable signal V
COMP, a positive input terminal is to couple this sawtooth waveforms V
SW, and an output is to provide a cut-off signals V
OFF
Fixedly power-on time drive circuit 216 is in order to comply with the said cut-off signals V from comparator 215
OFFAnd from a sensing signal V of an external transformer circuit
AUXFor this external transformer circuit provides a drive signal V
DRVAnd for switch 214 this reset signal RESET is provided, this sensing signal V wherein
AUXBe the time point that finishes in order to the inductive current discharge of pointing out this external transformer circuit, some action time of this reset signal RESET then follows this cut-off signals V
OFFAction time point after.
When fixing power-on time controller 210 is used for a discontinuous PFC power source conversion, satisfy this power source conversion-with electric energy by an AC power deliver to a load-required fixedly power-on time can cause this minimum detectable signal V
COMPA corresponding accurate position and should adapt to current source I
SA respective value, and V
COMP, LOW_LINEWith V
COMP, HIGH_LINEDifference can diminish because should adapt to current source I
S-receive V
COMPThis sawtooth waveforms V is revised in influence-meeting
SWThe slope that climbs so that V
COMP, LOW_LINEMust descend and V
COMP, HIGH_LINEMust rise to produce required t respectively
ON1And t
ON2
Please with reference to Fig. 5, it illustrates fixedly power-on time controller 210 itself and this AC power V of Fig. 3
ACLow line voltage and the corresponding respectively main signal waveforms of a high line voltage.As shown in Figure 5, V
DRV, LOW_LINE(according to this AC power V
ACThe drive signal V that produces of a low line voltage
DRV) have a fixing power-on time t
ON1, and V
DRV, HIGH_LINE(according to this AC power V
ACThe drive signal V that produces of a high line voltage
DRV) have a fixing power-on time t
ON2, wherein, because identical power can be delivered to a load, t
ON1Be to be longer than t
ON2Because this sawtooth waveforms V
SWAt this minimum detectable signal V
COMPBe in lower/have higher/lower slope that climbs, V during than high levle
COMP, HIGH_LINESatisfy and to move to allow higher V on the negative feedback controlling mechanism because of power source conversion
SW HIGH_LINE, thereby required t is provided
ON2And V
COMP, LOW_LINECan descend because of the negative feedback controlling mechanism of power source conversion to reduce V
SW, LOW_LINE, thereby required t is provided
ON1, and V
COMP, LOW_LINEAnd V
COMP, HIGH_LINEGap can be by Δ V
1Be reduced into Δ V
2
Can know by above explanation; Should adapt to current source generator through utilizing; Can make this fixedly the enforcement of its error amplifier of power-on time controller become many easily; And also can be integrated into this fixedly in the power-on time controller in order to the electric capacity that carries this sawtooth waveforms,, should patent so the present invention has really improved the disappearance of existing controller.
This case discloses, and is preferred embodiment, and patent right category of the present invention is not all taken off in local such as change or modification and come from technological thought of the present invention and be easy to know by inference by the people who is familiar with this skill.
Claims (10)
- One kind with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that having because of revising switching controller:One error amplifier has a negative input end coupling a feedback signal, and a positive input terminal is coupling a reference voltage, and an output is to provide a minimum detectable signal;One adapts to current source generator, adapts to current source in order to produce one according to this minimum detectable signal, wherein this adaptation current source be with this minimum detectable signal step-down/height become greatly/little;One electric capacity is the charging source with this adaptation current source, in order to carry a sawtooth waveforms;One switch, in order under the control of a reset signal with this capacitor discharge;One comparator has a negative input end coupling this minimum detectable signal, and a positive input terminal is coupling this sawtooth waveforms, and an output is to provide a cut-off signals; AndOne fixing power-on time drive circuit; In order to according to one drive signal being provided and this reset signal being provided for this switch for this external transformer circuit from the said cut-off signals of this comparator and from a sensing signal of an external transformer circuit; Wherein this sensing signal is the time point that finishes in order to the inductive current discharge of pointing out this external transformer circuit, and some action time of this reset signal then follows the action time of this cut-off signals after the point.
- 2. as claimed in claim 1 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that because of revising switching controller this adaptations current source generator has the operational amplifier of transduceing.
- One kind with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that having because of revising switching controller:One error amplifier has a negative input end coupling a feedback signal, and a positive input terminal is coupling a reference voltage, and an output is to provide a minimum detectable signal; AndOne adapts to current source generator, adapt to current source with to external capacitive charging in order to produce one according to this minimum detectable signal, thereby produce a sawtooth waveforms, wherein this adaptation current source be with this minimum detectable signal step-down/height become greatly/little.
- 4. as claimed in claim 3 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that further having a switch, in order under the control of a reset signal, to make this external capacitive discharge because of revising switching controller.
- 5. as claimed in claim 4 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time because of revising switching controller; It is characterized in that; Further has a comparator; This comparator has a negative input end coupling this minimum detectable signal, and a positive input terminal is coupling this sawtooth waveforms, and an output is to provide a cut-off signals.
- 6. as claimed in claim 5 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time because of revising switching controller; It is characterized in that; Further has a fixing power-on time drive circuit; In order to according to one drive signal being provided and this reset signal being provided for this switch for this external transformer circuit from the said cut-off signals of this comparator and from a sensing signal of an external transformer circuit; Wherein this sensing signal is the time point that finishes in order to the inductive current discharge of pointing out this external transformer circuit, and some action time of this reset signal then follows the action time of this cut-off signals after the point.
- 7. as claimed in claim 3 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that because of revising switching controller this adaptations current source generator has the operational amplifier of transduceing.
- One kind with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that having because of revising switching controller:One error amplifier has a negative input end coupling a feedback signal, and a positive input terminal is coupling a reference voltage, and an output is to provide a minimum detectable signal;One adapts to current source generator, adapts to current source in order to produce one according to this minimum detectable signal, wherein this adaptation current source be with this minimum detectable signal step-down/height become greatly/little;One electric capacity is the charging source with this adaptation current source, in order to carry a sawtooth waveforms;One switch, in order under the control of a reset signal with this capacitor discharge; AndOne comparator has a negative input end coupling this minimum detectable signal, and a positive input terminal is coupling this sawtooth waveforms, and an output is to provide a cut-off signals.
- 9. as claimed in claim 8 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time because of revising switching controller; It is characterized in that; Further has a fixing power-on time drive circuit; In order to according to one drive signal being provided and this reset signal being provided for this switch for this external transformer circuit from the said cut-off signals of this comparator and from a sensing signal of an external transformer circuit; Wherein this sensing signal is the time point that finishes in order to the inductive current discharge of pointing out this external transformer circuit, and some action time of this reset signal then follows the action time of this cut-off signals after the point.
- 10. as claimed in claim 8 with adapt to sawtooth waveforms fixedly the discontinuous merit of power-on time it is characterized in that because of revising switching controller this adaptations current source generator has the operational amplifier of transduceing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100817038A CN102739031A (en) | 2011-03-29 | 2011-03-29 | Discontinuous power factor correction switching controller adapted for fixed power supply time of sawtooth wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100817038A CN102739031A (en) | 2011-03-29 | 2011-03-29 | Discontinuous power factor correction switching controller adapted for fixed power supply time of sawtooth wave |
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|---|---|
| CN102739031A true CN102739031A (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100817038A Pending CN102739031A (en) | 2011-03-29 | 2011-03-29 | Discontinuous power factor correction switching controller adapted for fixed power supply time of sawtooth wave |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194118A (en) * | 2018-09-12 | 2019-01-11 | 杰华特微电子（杭州）有限公司 | Switching Power Supply and its control circuit and control method |
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| CN2747780Y (en) * | 2004-08-11 | 2005-12-21 | 张真正 | Switching source circuit having short output protective function |
| US20060022648A1 (en) * | 2004-08-02 | 2006-02-02 | Green Power Technologies Ltd. | Method and control circuitry for improved-performance switch-mode converters |
| CN101710794A (en) * | 2009-12-17 | 2010-05-19 | 北京中星微电子有限公司 | Alternating current-direct current flyback converter and loop circuit compensation method under total energy conversion mode |
| CN101964587A (en) * | 2009-04-06 | 2011-02-02 | 成都芯源系统有限公司 | Direct current converter and control circuit and method for direct current converter |
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2011
- 2011-03-29 CN CN2011100817038A patent/CN102739031A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| US20060022648A1 (en) * | 2004-08-02 | 2006-02-02 | Green Power Technologies Ltd. | Method and control circuitry for improved-performance switch-mode converters |
| CN2747780Y (en) * | 2004-08-11 | 2005-12-21 | 张真正 | Switching source circuit having short output protective function |
| CN101964587A (en) * | 2009-04-06 | 2011-02-02 | 成都芯源系统有限公司 | Direct current converter and control circuit and method for direct current converter |
| CN101710794A (en) * | 2009-12-17 | 2010-05-19 | 北京中星微电子有限公司 | Alternating current-direct current flyback converter and loop circuit compensation method under total energy conversion mode |
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| CN109194118A (en) * | 2018-09-12 | 2019-01-11 | 杰华特微电子（杭州）有限公司 | Switching Power Supply and its control circuit and control method |
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Application publication date: 20121017 |