CN101154113B - Quasi-resonance control circuit of power supplier and its control method - Google Patents
Quasi-resonance control circuit of power supplier and its control method Download PDFInfo
- Publication number
- CN101154113B CN101154113B CN200610141381A CN200610141381A CN101154113B CN 101154113 B CN101154113 B CN 101154113B CN 200610141381 A CN200610141381 A CN 200610141381A CN 200610141381 A CN200610141381 A CN 200610141381A CN 101154113 B CN101154113 B CN 101154113B
- Authority
- CN
- China
- Prior art keywords
- signal
- comparer
- voltage
- circuit
- connects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a quasi-resonant control circuit of power supplies and the control method . The present invention utilizes a control circuit formed by simple electric components and the control method to control a power transistor to conduct when the power transistor and a transformer is at zero voltage level, so as to reduce the switching loss when the conduction of the power transistor is conducted.
Description
[technical field]
The present invention refers to the conducting when the accurate position of no-voltage of power transistor and transformer contact especially about a kind of quasi-resonance control circuit and control method thereof of power supply unit, reduces the power transistor switch switch cost.
[background technology]
Quasi-resonance flyback switching power supply device generally is being used in the flyback switching power supply device on the market, the switch switch cost and the electromagnetic interference noise that produce during with the reduction conducting.Fig. 1 is known flyback quasi-resonance control circuit figure, the flyback circuit topology that is called RCC (Ring Choke Converter), please refer to Fig. 1, behind direct supply B+ electric power starting, at first provide Weak current slowly to charge to make power transistor Q1 conducting, primary side current to begin to flow to the negative pole that flyback transformer T1, power transistor Q1 and electric current detect resistance R 10 to primary side direct supply B+ through a resistance R 1.Power transistor Q1 is controlled by transistor Q3 by action, stops power transistor Q1 conducting when transistor Q3 base voltage reaches the about 0.7V of operation voltage.Transistor Q3 base stage operation voltage is to flow through resistance R 7, R8 and electric current by the photo-coupler U1 in the Voltage Feedback control circuit in side to detect the voltage overlaid that resistance R 10 current signal that produces and the electric current that flows through primary side power transistor Q1 detect on the resistance R 10 and produce.Then transistor Q3, transistor Q2 conducting when being higher than the about 0.7V of transistor Q3 base stage operation voltage, and make power transistor Q1 stop conducting.Otherwise Q1 conduction period secondary side because winding die mutually with output commutation diode D1 polarity, can't transmit energy to output terminal VO and temporarily with store energy in flyback transformer T1.Each winding polarity of flyback transformer T1 reverses at once behind the power transistor Q1 stop conducting, secondary side winding becomes forward with output commutation diode D1 polarity transformation, and the energy that is stored among the flyback transformer T1 is released to output terminal VO, and the charging current of required load of output terminal VO and output capacitance C3 is provided.Storage power among the flyback transformer T1 discharges when finishing, and secondary side winding flows to the current cut-off of output terminal VO, and output capacitance C3 continues supply of current and keeps required load current for output terminal VO.Flyback transformer T1 energy discharges the moment winding polarity of finishing and produces counter-rotating, and first side winding inductance and capacitor C 5 produce resonance and move and make voltage be sine wave to swing among this moment flyback transformer T1.When power transistor Q1 let out the utmost point (DRAIN) voltage near 0V the time, the gate of power transistor Q1 also simultaneously begins conducting by auxiliary winding supply of current through capacitor C 2, resistance R 2 when charging to noble potential, just close power transistor Q1 up to control when the transistor Q3 base voltage of action arrives 0.7V.The shortcoming of this circuit is not have the frequency limitation loop when being operated in underloading, frequency produces free modulation higher switch switch cost and because of crossing the assembly reliability problem that high-frequency work produces, also is difficult to meet simultaneously the power input loss requirement of green mode standard to quite high frequency of operation.
Fig. 2 is the movement oscillogram of the known flyback quasi-resonance control circuit of Fig. 1, wherein, TON is the turn-on cycle oscillogram of power transistor Q1, Q1-IDS lets out the utmost point (DRAIN) to source electrode (SOURCE) current waveform figure for power transistor Q1, Q1-VDS lets out the utmost point (DRAIN) to source electrode (SOURCE) voltage oscillogram for power transistor Q1, voltage when VDS (ON) is power transistor Q1 conducting, T1-E1 then are that the oscillogram and the ID of the elementary winding voltage of flyback transformer T1 is the current waveform figure through diode D1.
Fig. 3 is another known flyback quasi-resonance control circuit calcspar, because its circuit comparatively complexity can't draw its peripheral circuit is complete, but it is identical with the peripheral circuit of Fig. 4, the power transistor that following Fig. 3 explanation is carried is that external switch module is not in icon, its position corresponds to the power transistor Q2 ' of Fig. 4, as shown in Figure 3, this integrated circuit is the flyback quasi-resonance control circuit of improvement. and it is to utilize the Demag pin relatively to produce a conducting pulse signal as a comparer 1 among detection input end of assisting winding terminal voltage and the figure. and this conducting pulse signal inputs to the S input end of SR flip-flop 2, forcing the Drv of control circuit output terminal 3 to become noble potential makes the power transistor that is connected in after the control circuit output terminal Drv be conducting state. and this circuit then converts a voltage signal by the current signal of a side FB of the photo-coupler in Voltage Feedback control circuit pin to through change-over circuit by control and detects signal CS with the electric current that flows through the primary side power transistor and compare, two signals utilize a comparer 5 relatively to produce the R reverse input end that the disabling pulse signal inputs to SR flip-flop 2, forcing control circuit output terminal Drv to become electronegative potential makes power transistor be cut-off state. in addition, inside have one fixedly the blank time of 8us (blanking time) make control circuit 6 may command Drv conductings in first conducting pulse signal or conducting pulse signal backward.If first conducting pulse signal appears at after the blank time of 8us, then power transistor is controlled to conducting by first conducting pulse signal.Otherwise only the conducting pulse signal after the blank time of 8us can effectively allow the power transistor conducting.To be that frequency modulating is too high when preventing underloading produce higher switch switch cost to its purpose, because this blank time is fixing 8us value, so during underloading frequency of operation the highest will be tuned to fs=1/8uS=125KHz just stop frequency rise, by second or the power transistor beginning conducting when producing of backward conducting pulse signal.The frequency of the frequency of operation point of 125kHz still has very high switch switch cost producing by moment, removes the work of unsupported lower arrival output skip pattern and can just reduce this switch switch cost by moment because of component frequency reduces down.With reference to shown in Figure 3, required again for reaching this quasi-resonance control circuit action, the circuit complexity, number of parts is many, and cost costliness is its another shortcoming.
Therefore, how inventing out a kind of quasi-resonance control circuit and control method thereof of power supply unit, so that control circuit simply reaches the loss when reducing the power transistor switch switching, will be that the present invention desires actively to inquire into part.
[summary of the invention]
Because above-mentioned known shortcoming, it does not reach perfection creator's thoughts, then exhausting the concentrated research of its intelligence overcomes, be engaged in this industry accumulating experience for many years with it, and then develop a kind of quasi-resonance control circuit and control method thereof of power supply unit, in the hope of utilizing simple and easy electronic package to form control circuit, make the conducting when the accurate position of no-voltage of power transistor and transformer contact, reach the purpose that reduces the power transistor switch switch cost.
Fundamental purpose of the present invention is in quasi-resonance control circuit that a kind of power supply unit is provided and control method thereof, it is by the control circuit of being made up of simple and easy electronic package, make the conducting when the accurate position of no-voltage of power transistor and transformer contact, and then reach the purpose that reduces the power transistor switch switch cost.
A purpose of the present invention is the quasi-resonance control circuit that a kind of power supply unit is provided, comprise: a flyback transformer, it has an elementary winding, an auxiliary winding and a level winding, and this flyback transformer is in order to store and to change the energy of this power supply unit of output; One power transistor, it connects this elementary winding; One first comparer, it connects should assist winding; One oscillatory circuit, it connects this first comparer; One second comparer, it connects this oscillatory circuit; One voltage feedback circuit, it has a photo-coupler, and this voltage feedback circuit connects this secondary winding; One electric current detects resistance, and it connects this photo-coupler and this power transistor; One the 3rd comparer, it connects this electric current and detects resistance; And one drive circuit, it connects this second comparer, the 3rd comparer and this power transistor; Wherein, when the voltage of this auxiliary winding during less than one first reference voltage of this first comparer, this first comparer produces a pulse signal, the sawtooth voltage signal overlap that this pulse signal and this oscillatory circuit produce produces one first overlapped signal, when the voltage of this first overlapped signal during greater than one second reference voltage of this second comparer, this second comparer produces a Continuity signal, this Continuity signal makes this power transistor conducting via this driving circuit, and makes this flyback transformer storage power; When the voltage of the circuit output end of this this secondary winding of voltage feedback circuit perception, this photo-coupler produces a current signal, this current signal and this electric current detect a electric current that resistance produces and detect signal overlap and produce one second overlapped signal, when the voltage of this second overlapped signal during greater than one the 3rd reference voltage of the 3rd comparer, the 3rd comparer produces a pick-off signal, this pick-off signal ends this power transistor via this driving circuit, and makes the storage power output of this flyback transformer.
Another object of the present invention system provides a kind of control method of quasi-resonance control circuit of power supply unit, comprises:
(1) provides the quasi-resonance control circuit of foregoing this power supply unit;
(2) when the voltage of this auxiliary winding during, make this first comparer produce a pulse signal less than one first reference voltage of this first comparer;
(3) the sawtooth voltage signal overlap that this pulse signal and this oscillatory circuit are produced produces one first overlapped signal, when the voltage of this first overlapped signal during greater than one second reference voltage of this second comparer, makes this second comparer produce a Continuity signal;
(4) make this Continuity signal via this driving circuit with this power transistor conducting, and make this flyback transformer storage power;
(5) when the voltage of the circuit output end of this this secondary winding of voltage feedback circuit perception, make this photo-coupler produce a current signal;
(6) electric current that makes this current signal and this electric current detect the resistance generation detects signal overlap and produces one second overlapped signal, when the voltage of this second overlapped signal during, make the 3rd comparer produce a pick-off signal greater than one the 3rd reference voltage of the 3rd comparer; And
(7) this pick-off signal is ended this power transistor via this driving circuit, and make the storage power output of this flyback transformer.
By this, utilize simple and easy electronic package to form control circuit, make the conducting when the accurate position of no-voltage of power transistor and transformer contact, and then reduce the power transistor switch switch cost.
[description of drawings]
Fig. 1 is known flyback quasi-resonance control circuit figure.
Fig. 2 is the movement oscillogram of the known flyback quasi-resonance control circuit of Fig. 1.
Fig. 3 is another known flyback quasi-resonance control circuit calcspar.
Fig. 4 is the quasi-resonance control circuit figure of the power supply unit of preferred embodiment of the present invention.
Fig. 5 is the movement oscillogram of quasi-resonance control circuit of power supply unit of the preferred embodiment of the present invention of Fig. 4.
Fig. 6 is the quasi-resonance control circuit figure of the power supply unit of another preferred embodiment of the present invention.
Fig. 7 is the control method process flow diagram of quasi-resonance control circuit of the power supply unit of preferred embodiment of the present invention.
[embodiment]
For making your juror fully understand purpose of the present invention, feature and effect, now by following specific embodiment, and cooperate appended graphicly, the present invention is described in detail, illustrate as the back:
Fig. 4 is the quasi-resonance control circuit figure of the power supply unit of preferred embodiment of the present invention; as shown in the figure; this quasi-resonance control circuit is by the required voltage of supply voltage VCC pin supply control; this quasi-resonance control circuit comprises a under-voltage protecting circuit UVLO (UNDER VOLRAGE LOCKOUT); to guarantee charging to capacitor C 2 by starting resistance R1; supply voltage VCC just begins to have output when enough voltage is arranged; prevent that circuit working from damaging assembly unusually. a voltage detecting pin DEM; be responsible for detecting the wave trough position of auxiliary winding terminal voltage waveform; resistance R 8 can be adjusted and detect pin DEM voltage. via first comparer 7; if the voltage of auxiliary winding then produces a pulse signal less than the first reference voltage VREF1 of first comparer; resistance R 8 makes the trough of pulse signal and auxiliary winding voltage waveform synchronous. and the sawtooth voltage signal overlap that this pulse signal and oscillator produce produces one first overlapped signal; its again with the second reference voltage VREF2 of second comparer 8 relatively. if the voltage of first overlapped signal then produces a Continuity signal greater than the second reference voltage VREF2 of second comparer 8; the crest of Continuity signal and sawtooth voltage signal waveform is synchronous, and Continuity signal makes power transistor Q2 ' conducting through driving circuit (DRIVER CIRCUIT).Elementary winding, power transistor Q2 ', the electric current that direct supply B+ provides electric current to flow through flyback transformer T1 detects resistance R 7 ' and gets back to the negative pole of primary side direct supply B+ (primary side earth terminal), flyback transformer T1 storage power.When the voltage of the circuit output end VO of this this secondary winding of voltage feedback circuit perception, the current signal of a side FB of the photo-coupler U1 pin in the Voltage Feedback control circuit, detecting electric current that resistance R 7 ' produces through resistance R 5, R6 with electric current detects signal overlap and produces one second overlapped signal, if the voltage of second overlapped signal through the 3rd comparer 9 relatively after greater than the 3rd reference voltage VREF3, then produce a pick-off signal and power transistor Q2 ' is ended, and make the storage power output of this flyback transformer to driving circuit.The sawtooth voltage signal that oscillator produces can see through resistance value or capacitance is freely adjusted the sawtooth voltage slope, control and whether produce Continuity signal when first pulse signal occurs, or delay and when pulse signal backward occurs, just produce Continuity signal, frequency modulating is too high and produce higher switch switch cost when preventing underloading.
Fig. 5 is the movement oscillogram of quasi-resonance control circuit of power supply unit of the preferred embodiment of the present invention of Fig. 4, please refer to Fig. 5, pulse signal (PULSE SIGNAL) is obtained by the wave trough position that detects auxiliary winding terminal voltage waveform (VDS/VAUX), and Continuity signal (ON SIGNAL) produces when first overlapped signal is higher than the second reference voltage VREF2.Pick-off signal (OFF SIGNAL) is then produced when side a current signal that produces and an electric current that flows through primary side power transistor Q2 ' detect signal overlap and the 3rd reference voltage VREF3 comparison by the photo-coupler U1 in the Voltage Feedback control circuit.Fig. 5 below shows that the underload conducting drops on second trough, and to drop on first trough different with top high capacity conducting.
Fig. 6 is the quasi-resonance control circuit figure of the power supply unit of another preferred embodiment of the present invention.It replaces the comparer among Fig. 4 respectively with transistor, first and third reference voltage then utilizes the about 0.7V of transistor base operation voltage to replace, second reference voltage then utilizes two or more electric resistance partial pressures to replace, and finishes the quasi-resonance control circuit of power supply unit of the present invention.
Fig. 7 is the control method process flow diagram of quasi-resonance control circuit of the power supply unit of preferred embodiment of the present invention.Cooperate Fig. 4, wherein this method may further comprise the steps:
(1) provides the quasi-resonance control circuit of power supply unit as shown in Figure 4;
(2) when the voltage of auxiliary winding during, make first comparer 7 produce a pulse signal less than first reference voltage of first comparer 7;
(3) the sawtooth voltage signal overlap that pulse signal and oscillatory circuit are produced produces one first overlapped signal, when the voltage of first overlapped signal during more than or equal to second reference voltage of second comparer 8, makes second comparer 8 produce a Continuity signal;
(4) make Continuity signal via driving circuit with power transistor Q2 ' conducting, and make flyback transformer T1 storage power;
(5) when the voltage of the circuit output end VO of this secondary winding of voltage feedback circuit perception, make photo-coupler U1 produce a current signal;
(6) make current signal and electric current detect electric current that resistance R 7 ' produces and detect signal overlap and produce second overlapped signal,, make the 3rd comparer 9 produce a pick-off signal when the voltage of second overlapped signal during greater than the 3rd reference voltage of the 3rd comparer 9; And
(7) pick-off signal is ended power transistor Q2 ' via driving circuit, and make the storage power output of flyback transformer T1.
As mentioned above, the present invention meets patent three important documents fully: the utilizability on novelty, progressive and the industry.With novelty and progressive, the present invention system utilizes simple and easy electronic package to form control circuit, makes the conducting when the accurate position of no-voltage of power transistor and transformer contact, and then reaches the purpose that reduces the power transistor switch switch cost; With regard to the utilizability on the industry, the product that utilizes the present invention to derive is when the demand that can fully satisfy existing market.
The present invention discloses with preferred embodiment hereinbefore, so has the knack of this operator and it should be understood that this embodiment only is used to describe the present invention, does not limit the scope of the invention and should not be read as.It should be noted,, all should be made as and be covered by in the category of the present invention such as with the variation and the displacement of this embodiment equivalence.Therefore, protection scope of the present invention when with hereinafter claims the person of being defined be as the criterion.
Claims (9)
1. the quasi-resonance control circuit of a power supply unit comprises:
One flyback transformer, it has an elementary winding, an auxiliary winding and a level winding, and this flyback transformer is in order to store and to change the energy of this power supply unit of output;
One power transistor, it connects this elementary winding;
One first comparer, it connects should assist winding;
One oscillatory circuit, it connects this first comparer;
One second comparer, it connects this oscillatory circuit;
One voltage feedback circuit, it has a photo-coupler, and this voltage feedback circuit connects this secondary winding output terminal;
One electric current detects resistance, and it connects this photo-coupler and this power transistor;
One the 3rd comparer, it connects this electric current and detects resistance; And
One drive circuit, it connects this second comparer, the 3rd comparer and this power transistor;
Wherein, when the voltage of this auxiliary winding during less than one first reference voltage of this first comparer, this first comparer produces a pulse signal, the sawtooth voltage signal overlap that this pulse signal and this oscillatory circuit produce produces one first overlapped signal, the crest current potential of this this sawtooth voltage signal of pulse signal bed hedgehopping, when the voltage of this first overlapped signal during greater than one second reference voltage of this second comparer, this second comparer produces a Continuity signal, this Continuity signal makes this power transistor conducting via this driving circuit, and makes this flyback transformer storage power; When the voltage of the circuit output end of this this secondary winding of voltage feedback circuit perception, this photo-coupler produces a current signal, this current signal and this electric current detect a electric current that resistance produces and detect signal overlap and produce one second overlapped signal, when the voltage of this second overlapped signal during greater than one the 3rd reference voltage of the 3rd comparer, the 3rd comparer produces a pick-off signal, this pick-off signal ends this power transistor via this driving circuit, and the storage power of this flyback transformer is exported, wherein, this pulse signal is synchronous with the trough that is somebody's turn to do auxiliary winding voltage waveform;
The current potential of this second reference voltage is greater than the crest current potential of this sawtooth voltage signal.
2. the quasi-resonance control circuit of a power supply unit comprises:
One flyback transformer, it has an elementary winding, an auxiliary winding and a level winding, and this flyback transformer is in order to store and to change the energy of this power supply unit of output;
One power transistor, it connects this elementary winding;
One first comparer, it connects should assist winding;
One oscillatory circuit, it connects this first comparer;
One second comparer, it connects this oscillatory circuit;
One voltage feedback circuit, it has a photo-coupler, and this voltage feedback circuit connects this secondary winding output terminal;
One electric current detects resistance, and it connects this photo-coupler and this power transistor;
One the 3rd comparer, it connects this electric current and detects resistance; And
One drive circuit, it connects this second comparer, the 3rd comparer and this power transistor;
Wherein, when the voltage of this auxiliary winding during less than one first reference voltage of this first comparer, this first comparer produces a pulse signal, the sawtooth voltage signal overlap that this pulse signal and this oscillatory circuit produce produces one first overlapped signal, the crest current potential of this this sawtooth voltage signal of pulse signal bed hedgehopping, when the voltage of this first overlapped signal during greater than one second reference voltage of this second comparer, this second comparer produces a Continuity signal, this Continuity signal makes this power transistor conducting via this driving circuit, and makes this flyback transformer storage power; When the voltage of the circuit output end of this this secondary winding of voltage feedback circuit perception, this photo-coupler produces a current signal, this current signal and this electric current detect a electric current that resistance produces and detect signal overlap and produce one second overlapped signal, when the voltage of this second overlapped signal during greater than one the 3rd reference voltage of the 3rd comparer, the 3rd comparer produces a pick-off signal, this pick-off signal ends this power transistor via this driving circuit, and the storage power of this flyback transformer is exported, wherein, the crest of this Continuity signal and this sawtooth voltage signal waveform is synchronous;
The current potential of this second reference voltage is greater than the crest current potential of this sawtooth voltage signal.
3. the quasi-resonance control circuit of power supply unit according to claim 1 and 2 is characterized in that, the slope of this sawtooth voltage signal is by a resistance value or a capacitance adjustment, the maximum operation frequency value during with the setpoint frequency modulation.
4. the quasi-resonance control circuit of power supply unit according to claim 1 is characterized in that, more comprises a resistance, and it makes this pulse signal and should assist the trough of winding voltage waveform synchronous.
5. the quasi-resonance control circuit of power supply unit according to claim 1 and 2 is characterized in that, more comprises a under-voltage protecting circuit, and it prevents that the circuit start from damaging electronic package unusually.
6. the quasi-resonance control circuit of power supply unit according to claim 1 and 2 is characterized in that, this first comparer is made of at least one transistor.
7. the quasi-resonance control circuit of power supply unit according to claim 1 and 2 is characterized in that, this second comparer is made of at least one transistor.
8. the quasi-resonance control circuit of power supply unit according to claim 1 and 2 is characterized in that, the 3rd comparer is made of at least one transistor.
9. the control method of the quasi-resonance control circuit of a power supply unit comprises:
A) provide the quasi-resonance control circuit of this power supply unit as claimed in claim 1 or 2;
B) when the voltage of this auxiliary winding during, make this first comparer produce a pulse signal less than one first reference voltage of this first comparer;
C) the sawtooth voltage signal overlap that this pulse signal and this oscillatory circuit are produced produces one first overlapped signal, when the voltage of this first overlapped signal during greater than one second reference voltage of this second comparer, makes this second comparer produce a Continuity signal;
D) make this Continuity signal via this driving circuit with this power transistor conducting, and make this flyback transformer storage power;
E) when the voltage of the circuit output end of this this secondary winding of voltage feedback circuit perception, make this photo-coupler produce a current signal;
F) electric current that makes this current signal and this electric current detect the resistance generation detects signal overlap and produces one second overlapped signal, when the voltage of this second overlapped signal during, make the 3rd comparer produce a pick-off signal greater than one the 3rd reference voltage of the 3rd comparer; And
G) this pick-off signal is ended this power transistor via this driving circuit, and make the storage power output of this flyback transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610141381A CN101154113B (en) | 2006-09-26 | 2006-09-26 | Quasi-resonance control circuit of power supplier and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610141381A CN101154113B (en) | 2006-09-26 | 2006-09-26 | Quasi-resonance control circuit of power supplier and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101154113A CN101154113A (en) | 2008-04-02 |
| CN101154113B true CN101154113B (en) | 2010-05-12 |
Family
ID=39255806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610141381A Expired - Fee Related CN101154113B (en) | 2006-09-26 | 2006-09-26 | Quasi-resonance control circuit of power supplier and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101154113B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545545A (en) * | 2011-01-03 | 2012-07-04 | 芯瑞科技股份有限公司 | Power supplies and control methods for operating in quadrature-resonance-similar mode |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214988A (en) * | 2010-04-06 | 2011-10-12 | 大连精拓光电有限公司 | System for providing low-voltage protection for switch power supply converter |
| CN102185595B (en) * | 2011-01-18 | 2013-02-13 | 浙江昱能光伏科技集成有限公司 | Quasi-resonance testing circuit and quasi-resonance control circuit of inverter |
| WO2012105077A1 (en) * | 2011-02-01 | 2012-08-09 | 富士電機株式会社 | Resonant-type switching power supply apparatus |
| CN102307019B (en) * | 2011-08-12 | 2013-09-11 | 浙江昱能光伏科技集成有限公司 | Quasi-resonant control circuit of inverter |
| CN103066868A (en) * | 2011-10-20 | 2013-04-24 | 通嘉科技股份有限公司 | Primary side control method and power controller |
| US9419527B2 (en) * | 2012-03-07 | 2016-08-16 | Dialog Semiconductor Inc. | Regulation for power supply mode transition to low-load operation |
| CN103326586A (en) * | 2013-06-25 | 2013-09-25 | 深圳市威纳源电子有限公司 | LC full resonant circuit soft switch |
| JP6272679B2 (en) * | 2013-11-22 | 2018-01-31 | ローム株式会社 | Power supply control circuit, power supply device and electronic device |
| CN103683867B (en) * | 2013-12-06 | 2016-03-30 | 深圳市华星光电技术有限公司 | Inverse-excitation type switch power-supply circuit and apply the backlight driving device of this circuit |
| CN104242658B (en) * | 2014-09-19 | 2017-02-22 | 无锡芯朋微电子股份有限公司 | Valley-switching digital control circuit of switch power source |
| CN112994445B (en) * | 2021-04-25 | 2021-07-27 | 四川蕊源集成电路科技有限公司 | Apparatus and method for reducing electromagnetic interference of DC-DC power supply |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5666279A (en) * | 1994-11-24 | 1997-09-09 | Minebea Co., Ltd. | Voltage resonance inverter circuit for dimable cold cathode tubes |
| US5831838A (en) * | 1993-08-16 | 1998-11-03 | Avionics Instruments, Inc. | Resonant fly-forward converter circuit |
| US6078510A (en) * | 1998-09-23 | 2000-06-20 | Stmicroelectronics S.R.L. | Wholly integrated switch-on control loop of a high voltage power transistor of a quasi resonant flyback converter |
| CN2652036Y (en) * | 2003-08-04 | 2004-10-27 | 尼克森微电子股份有限公司 | Synchronous rectifying control circuit of reversal power supply |
| CN1698256A (en) * | 2003-03-28 | 2005-11-16 | 索尼株式会社 | Switching power supply apparatus |
| CN200956551Y (en) * | 2006-09-27 | 2007-10-03 | 尼克森微电子股份有限公司 | Quasi-resonant control circuit for power supply system |
-
2006
- 2006-09-26 CN CN200610141381A patent/CN101154113B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5831838A (en) * | 1993-08-16 | 1998-11-03 | Avionics Instruments, Inc. | Resonant fly-forward converter circuit |
| US5666279A (en) * | 1994-11-24 | 1997-09-09 | Minebea Co., Ltd. | Voltage resonance inverter circuit for dimable cold cathode tubes |
| US6078510A (en) * | 1998-09-23 | 2000-06-20 | Stmicroelectronics S.R.L. | Wholly integrated switch-on control loop of a high voltage power transistor of a quasi resonant flyback converter |
| CN1698256A (en) * | 2003-03-28 | 2005-11-16 | 索尼株式会社 | Switching power supply apparatus |
| CN2652036Y (en) * | 2003-08-04 | 2004-10-27 | 尼克森微电子股份有限公司 | Synchronous rectifying control circuit of reversal power supply |
| CN200956551Y (en) * | 2006-09-27 | 2007-10-03 | 尼克森微电子股份有限公司 | Quasi-resonant control circuit for power supply system |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平10-28375A 1998.01.27 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545545A (en) * | 2011-01-03 | 2012-07-04 | 芯瑞科技股份有限公司 | Power supplies and control methods for operating in quadrature-resonance-similar mode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101154113A (en) | 2008-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101154113B (en) | Quasi-resonance control circuit of power supplier and its control method | |
| CN101557171B (en) | Switching control circuit | |
| CN102651615B (en) | Power converter and control method thereof | |
| CN101826796B (en) | Utilize quasi resonator system and the method for Multi-model control | |
| CN103973092B (en) | A kind of soft-start method of LLC resonant converter | |
| CN102904449B (en) | The Circuit tuning of cable compensation for power converter is provided | |
| CN102097960B (en) | Controller for power converter and control method for quasi resonant power converter | |
| CN101355306B (en) | Synchronous rectification circuit and method for power converter | |
| CN102355145B (en) | Control circuit of power converter | |
| CN103683954A (en) | Active clamping circuit | |
| CN203482091U (en) | Converter and power factor controller | |
| US9252677B2 (en) | Quasi resonant push-pull converter and control method thereof | |
| CN101202511A (en) | Synchronous rectification circuit for resonance power converter | |
| CN102142777B (en) | For starting the method for DC-to-DC converter | |
| CN103066853A (en) | Control circuit, switching power supply and control method thereof | |
| CN102971953A (en) | Switching control circuit and switching power supply apparatus | |
| CN103066855A (en) | System and method used for no-voltage switch in power source transformation system | |
| TW202131615A (en) | Switched mode power supply with multi-mode operation and method therefor | |
| CN201440636U (en) | Limiting circuit with largest conduction duty ratio for power switch tube of switch power supply | |
| CN103187864A (en) | Buck active power factor correction device | |
| CN200956551Y (en) | Quasi-resonant control circuit for power supply system | |
| CN203278655U (en) | control circuit and switching power supply | |
| CN201846229U (en) | Soft start circuit | |
| CN201409085Y (en) | DC pressure-boosting converter | |
| EP1855381B1 (en) | Drive unit for a half bridge converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20120926 |