CN101951175A - Flyback synchronous rectification control circuit - Google Patents
Flyback synchronous rectification control circuit Download PDFInfo
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- CN101951175A CN101951175A CN 201010255471 CN201010255471A CN101951175A CN 101951175 A CN101951175 A CN 101951175A CN 201010255471 CN201010255471 CN 201010255471 CN 201010255471 A CN201010255471 A CN 201010255471A CN 101951175 A CN101951175 A CN 101951175A
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Abstract
The invention relates to a flyback synchronous rectification control circuit, comprising a primary switching tube (Q1), a synchronous rectifier tube (Q2), a primary side of a main transformer (T1), a subsidiary side of the main transformer (T2), a synchronous rectifier module, a control circuit composed of a drive circuit (1), a delay circuit (2), a signal same-phase transmission circuit (3), a sharp pulse forming circuit (4) and a synchronous rectification forcibly turned-off circuit (5). When a power source operates in a continuous mode, the synchronous rectifier tube (Q2) can be forcibly turned off in advance through the control circuit, thus reverse current can not pass through the synchronous rectifier tube (Q2), thereby reducing the loss and the voltage stress of the synchronous rectifier tube (Q2), and improving the efficiency of the power source; and when the power source operates in a discontinuous mode or in a critical continuous mode, the control circuit is inoperative, and can not influence the normal operation of the circuit.
Description
Technical field
The present invention relates to Switching Power Supply, relate in particular to a kind of counter exciting synchronous rectification control circuit of switch power work under continuous mode that allow.
Background technology
Along with the development of technology, the conversion efficiency of power supply requires more and more higher, and synchronous rectification replaces traditional diode rectification to become a kind of trend.Traditional circuit of synchronous rectification such as Fig. 1, its operation principle is: utilize electric current flow through forward voltage drop that rectifying tube (MOSFET) produced and oppositely pressure drop control, when the forward voltage drop that detects the rectifying tube two ends reached the threshold points of a certain setting, it is open-minded that circuit of synchronous rectification or control IC drive rectifying tube; In case the pressure drop at its two ends drops to zero or when reverse pressure drop was arranged, control circuit or IC will turn-off rectifying tube, finish a switch periods, realize rectification function.It is when practical application:
1, power supply is usually operated at discontinuous or the critical flow Discontinuous Conduction mode, rectifying tube does not have reverse current to flow through when turn-offing like this, but the current stress of rectifying tube and primary switch pipe is big, and loss also increases, want to reduce this part loss, power supply only works in continuous mode;
If 2 enter continuous mode, in the rectifying tube turn off process, have very big reverse current and flow through, thereby produce unnecessary turn-off power loss, and increase voltage stress, the temperature stress of device, reduce power-efficient and reliability.
In view of above 2 points, traditional circuit of synchronous rectification still is operated under the continuous mode no matter allow power work under discontinuous or critical flow Discontinuous Conduction mode, and the loss of device all can increase, and power-efficient and reliability are also lower.
Summary of the invention
For the circuit of synchronous rectification device loss that solves prior art big, the defective that power-efficient and reliability are low, the invention provides primary switch pipe (Q1), synchronous rectifier (Q2), the former limit of main transformer (T1), the secondary of main transformer (T1) and synchronous rectification module, it is characterized in that: also comprise by drive circuit (1), delay circuit (2), signal homophase transmission circuit (3), spike forms the control circuit of circuit (4) and synchronous rectification pressure breaking circuit (5) composition, described delay circuit (2) and drive circuit (1) are connected in series, the other end of delay circuit (1) receives pwm signal (U1) and drive signal (DRV), the other end of drive circuit (1) is connected with the grid of described primary switch pipe (Q1), described signal homophase transmission circuit (3), spike forms circuit (4), synchronous rectification forces the grid of breaking circuit (5) and described synchronous rectifier (Q2) to be connected successively; Described synchronous rectification module is connected with source electrode with the drain electrode of described synchronous rectifier (Q2) respectively.
Preferably, described signal homophase transmission circuit (3) is one that appoints in transformer (T2), optocoupler or the drive IC; The resistance that it is electric capacity (C2) that described spike forms circuit (4), be connected in series powers up any in the pulse generator perhaps; Described synchronous rectification pressure breaking circuit (5) is any in MOSFET, triode, optocoupler, transformer, the drive IC.
Preferred again, also comprise drive circuit (6), its input forces breaking circuit (5) to link to each other with described synchronous rectification, and links to each other with described synchronous rectification module by resistance (R2), and output links to each other with the grid of described synchronous rectifier (Q2) by resistance (R3).
Described signal homophase transmission circuit (3) is made of transformer (T2) and the electric capacity (C1) that is connected its former limit, the other end of described electric capacity (C1) receives drive signal (DRV), and the secondary of described transformer (T2) connects the input that described spike forms circuit (4) and synchronous rectification pressure breaking circuit (5) respectively; Or described signal homophase transmission circuit (3) comprises diode (D1) that the electric capacity (C1) that is connected in parallel is connected with resistance (R4), inverse parallel and photodiode (VD), and phototriode (VT), a common ends of described electric capacity that is connected in parallel (C1) and resistance (R4) receives drive signal (DRV), another common ends connects the negative pole of described diode (D1) and the positive pole of described photodiode (VD), the minus earth of the positive pole of described diode (D1) and photodiode (VD); Described phototriode (VT) intercouples with described photodiode (VD), and links to each other with the input that described spike forms circuit (4) by its emitter; Or described signal homophase transmission circuit (3) is an isolation drive IC, and described isolation drive IC receives drive signal (DRV) respectively and connects described spike and forms the input of circuit (4) and the output that breaking circuit (5) is forced in described synchronous rectification.
The other end of described signal homophase transmission circuit (3) receives or couple drive signal (DRV).
Pwm signal (U1) or the outside synchronizing signal that provides are provided described signal homophase transmission circuit (3).
The invention has the beneficial effects as follows:
, in advance synchronous rectifier is turn-offed by force when the continuous mode by the control circuit that is provided with, avoided reverse current to flow through, reduced its loss and voltage stress, improved the efficient of power supply; Under discontinuous or critical flow Discontinuous Conduction mode, circuit of synchronous rectification or control IC oneself in of the present invention control circuit turn-offed rectifying tube in advance, so circuit of the present invention is inoperative, so can not influence the operate as normal of circuit simultaneously.
Signal homophase transmission circuit adopts optocoupler to constitute, and the circuit volume is little like this, cost is low.
Signal homophase transmission circuit adopts isolation drive IC to constitute, and same circuit volume is little, and function admirable.
The mode of pwm signal (U1) or the outside synchronizing signal that provides is provided signal homophase transmission circuit (3), can be according to practical situations, and flexible design, design is convenient.
Description of drawings
Fig. 1 is the counter exciting synchronous rectification control circuit schematic diagram of prior art;
Fig. 2 is the counter exciting synchronous rectification control circuit theory diagram of one embodiment of the invention;
Fig. 3 is the counter exciting synchronous rectification control circuit theory diagram of another embodiment of the present invention;
Fig. 4,5, the 6th, the counter exciting synchronous rectification control circuit figure of the embodiment of Fig. 3 (the concrete formation of signal homophase transmission circuit is different among Fig. 4,5,6);
Fig. 7 is the counter exciting synchronous rectification control circuit figure of the embodiment of Fig. 3, and its signal homophase transmission circuit receives pwm signal.
Embodiment
The counter exciting synchronous rectification circuit of this embodiment as shown in Figure 2, it comprises the former limit of primary switch pipe Q1, synchronous rectifier Q2, main transformer T1, secondary and the synchronous rectification module of main transformer T1, and described synchronous rectification module is a synchronous rectification circuit or a control IC; Also comprise by drive circuit 1, delay circuit 2, signal homophase transmission circuit 3, spike and form the control circuit that circuit 4 and synchronous rectification force breaking circuit 5 to be formed, described delay circuit 2 and drive circuit 1 are connected in series, the other end of delay circuit 1 receives pwm signal U1 and drive signal DRV, the other end of drive circuit 1 is connected with the grid of described primary switch pipe Q1, and described signal homophase transmission circuit 3, spike form circuit 4, synchronous rectification forces the grid of breaking circuit 5 and described synchronous rectifier Q2 to be connected successively; Described synchronous rectification module is connected with source electrode with the drain electrode of described synchronous rectifier Q2 respectively, and the other end of described signal homophase transmission circuit 3 receives drive signal DRV.
Among this embodiment, can economize the drive circuit that goes to Q2, directly being driven by synchronous rectification forces breaking circuit to close the work of circuit of synchronous rectification or control IC, circuit is simple like this, cost is low, design is convenient, but the drive current of circuit of synchronous rectification or control IC is big, temperature stress is relatively large, should not be used under the situation of the very big or a plurality of rectifying tube parallel connections of junction capacitance of Q2.
The counter exciting synchronous rectification circuit of this embodiment as shown in Figure 3, the difference of itself and previous embodiment 1 is also to comprise drive circuit 6, its input forces breaking circuit 5 to link to each other with described synchronous rectification, and link to each other with described synchronous rectification module by resistance R 2, output passes through resistance R 3 and links to each other with the grid of described synchronous rectifier Q2.
By increasing drive circuit 6 and protective resistance R2, R3, can make the entire circuit more stable work reliable among this embodiment.
As shown in Figure 4, the circuit of this embodiment comprises the former limit of primary switch pipe Q1, synchronous rectifier Q2, main transformer T1, secondary and the synchronous rectification module of main transformer T1, and described synchronous rectification module is a synchronous rectification circuit or a control IC; Also comprise by drive circuit 1, delay circuit 2, signal homophase transmission circuit 3, spike and form the control circuit that circuit 4 and synchronous rectification force breaking circuit 5 to be formed, described delay circuit 2 and drive circuit 1 are connected in series, the other end of delay circuit 1 receives pwm signal U1 and drive signal DRV, the other end of drive circuit 1 is connected with the grid of described primary switch pipe Q1, and described signal homophase transmission circuit 3, spike form circuit 4, synchronous rectification forces the grid of breaking circuit 5 and described synchronous rectifier Q2 to be connected successively; Described synchronous rectification module is connected with source electrode with the drain electrode of described synchronous rectifier Q2 respectively, and the other end of described signal homophase transmission circuit 3 receives drive signal DRV.Signal homophase transmission circuit 3 is made of with the capacitor C 1 that is connected its former limit transformer T2, the other end of described capacitor C 1 receives drive signal DRV, and the secondary of described transformer T2 connects the input that described spike forms circuit 4 and synchronous rectification pressure breaking circuit 5 respectively.
Described delay circuit 2 and drive circuit 1 are connected in series, the other end of delay circuit 2 receives pwm signal and is connected with drive signal, the other end of drive circuit 1 is connected with the grid of described primary switch pipe Q1, and described signal homophase transmission circuit 3, spike form circuit 4, synchronous rectification forces breaking circuit 5, drive circuit 6 to be connected successively with the grid of described synchronous rectifier Q2; The other end of described signal circuit 3 connects (can certainly be coupling) on drive signal DRV; Described circuit of synchronous rectification is connected with source electrode with the drain electrode of described synchronous rectifier Q2 respectively, also forces the common ends of breaking circuit 5 to be connected by resistance R 2 with described drive circuit 6 and synchronous rectification.It is capacitor C 2 (also can be that resistance powers up perhaps pulse generator) that spike forms circuit 4; Synchronous rectification drives and forces breaking circuit is triode (also can be MOSFET pipe, optocoupler, transformer, drive IC etc.).
Power work is when continuous mode, after drive signal DRV is by high step-down, primary switch pipe Q1 turn-offs, transformer TI-B both end voltage anti-phase (3 pin for just, 4 pin are for negative), electric current flows out from 3 foots of T1-B, give capacitor C 3 chargings, and flow back to 4 foots of T1-B through the body diode of synchronous rectifier Q2,3,2 pin of synchronous rectifier Q2 produce pressure drop, when pressure drop reaches the threshold points of a certain setting, circuit of synchronous rectification or control IC output drive signal, process R2, drive circuit 6, R3 make synchronous rectifier Q2 conducting realize rectification and reduce the wastage.Because power supply needs to provide energy to load outward, the electric current that flows through synchronous rectifier Q2 can descend gradually, also do not drop to zero and circuit of synchronous rectification or control IC when yet not turn-offing synchronous rectifier Q2 at electric current, the drive signal DRV of U1 begins to be uprised by low, this signal is sent to spike by signal homophase transmission circuit 3 immediately and forms circuit 4, producing a spike signal with drive signal DRV homophase makes synchronous rectification drive 5 work of pressure breaking circuit, the drive signal of circuit of synchronous rectification or control IC is forced to drag down, and synchronous rectifier Q2 is forced to turn-off.Simultaneously drive signal DRV needs could allow primary switch pipe Q1 conducting after 2 time-delay a period of times by delay circuit, when 4 foots of Q1 conducting of primary switch pipe and T1-B uprise, control circuit of the present invention turn-offs synchronous rectifier Q2 in advance by force, therefore not having reverse current among the synchronous rectifier Q2 flows through, reduce its loss and voltage stress, improved the efficient of power supply.
Power work is under discontinuous or critical flow Discontinuous Conduction mode, after drive signal DRV is by high step-down, primary switch pipe Q1 turn-offs, transformer TI-B both end voltage is anti-phase, electric current flows out from 3 foots of T1-B, give capacitor C 3 chargings, and flow back to 4 foots of T1-B through the body diode of synchronous rectifier Q2,3 of synchronous rectifier Q2,2 pin produce pressure drop, when pressure drop reaches the threshold points of a certain setting, circuit of synchronous rectification or control IC output drive signal, through resistance R 2, drive circuit, resistance R 3 makes synchronous rectifier Q2 conducting, can descend gradually owing to flow through the electric current of synchronous rectifier Q2, circuit of synchronous rectification or control IC can be closed driving automatically when being reduced to certain value or zero, and synchronous rectifier Q2 turn-offs; This moment, drive signal DRV still was low, then it is uprised by low, drive signal DRV signal is sent to spike by signal homophase transmission circuit 5 of the present invention and forms circuit 4, produce a spike signal and make synchronous rectification drive 5 work of pressure breaking circuit, the drive signal of circuit of synchronous rectification or control IC is forced to drag down with drive signal DRV homophase.Because under this pattern, circuit of synchronous rectification or control IC oneself turn-offed synchronous rectifier Q2 in control circuit of the present invention in advance, therefore, the inoperative operate as normal that also can not influence circuit of circuit of the present invention under this pattern.
Delay circuit among the present invention can be regulated the delay time of drive signal DRV according to actual conditions, reduces losing of duty ratio, makes efficient reach the highest.
Signal homophase transmission circuit 5 adopts optocoupler to constitute, and the circuit volume is little like this, cost is low.
Embodiment 5
As shown in Figure 6, the difference of this embodiment and embodiment 3 is signal homophase transmission circuit 5 employing isolation drive IC formations wherein, same little, the function admirable of circuit volume, but cost is higher relatively.
Embodiment 6
As shown in Figure 6, the difference of this embodiment and embodiment 3 is also to comprise sawtooth signal coupling circuit or synchronizing signal coupling circuit, can get drive signal DRV separately, can take the sawtooth waveforms of PWM chip oscillator generation or the synchronizing signal of outer confession, control synchronous rectifier and turn-off in advance.This circuit can be according to practical situations, flexible design, and design is convenient.
Above content is in conjunction with specific embodiments to further describing that the present invention did, and can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. counter exciting synchronous rectification control circuit, comprise primary switch pipe (Q1), synchronous rectifier (Q2), the former limit of main transformer (T1), the secondary of main transformer (T1) and synchronous rectification module, it is characterized in that: also comprise by drive circuit (1), delay circuit (2), signal homophase transmission circuit (3), spike forms the control circuit of circuit (4) and synchronous rectification pressure breaking circuit (5) composition, described delay circuit (2) and drive circuit (1) are connected in series, the other end of delay circuit (1) receives signal (U1) or its drive signal (DRV) from PWM, the other end of drive circuit (1) is connected with the grid of described primary switch pipe (Q1), described signal homophase transmission circuit (3), spike forms circuit (4), synchronous rectification forces the grid of breaking circuit (5) and described synchronous rectifier (Q2) to be connected successively; Described synchronous rectification module is connected with source electrode with the drain electrode of described synchronous rectifier (Q2) respectively.
2. counter exciting synchronous rectification control circuit as claimed in claim 1 is characterized in that: described signal homophase transmission circuit (3) is one that appoints in transformer (T2), optocoupler or the drive IC; The resistance that it is electric capacity (C2) that described spike forms circuit (4), be connected in series powers up any in the pulse generator perhaps; Described synchronous rectification pressure breaking circuit (5) is any in MOSFET, triode, optocoupler, transformer, the drive IC.
3. counter exciting synchronous rectification control circuit as claimed in claim 2, it is characterized in that: also comprise drive circuit (6), its input forces breaking circuit (5) to link to each other with described synchronous rectification, and link to each other with described synchronous rectification module by resistance (R2), output passes through resistance (R3) and links to each other with the grid of described synchronous rectifier (Q2).
4. as arbitrary described counter exciting synchronous rectification control circuit among the claim 1-3, it is characterized in that:
Described signal homophase transmission circuit (3) is made of transformer (T2) and the electric capacity (C1) that is connected its former limit, the other end of described electric capacity (C1) receives drive signal (DRV), and the secondary of described transformer (T2) connects the input that described spike forms circuit (4) and synchronous rectification pressure breaking circuit (5) respectively; Or
Described signal homophase transmission circuit (3) comprises diode (D1) that the electric capacity (C1) that is connected in parallel is connected with resistance (R4), inverse parallel and photodiode (VD), and phototriode (VT), a common ends of described electric capacity that is connected in parallel (C1) and resistance (R4) receives drive signal (DRV), another common ends connects the negative pole of described diode (D1) and the positive pole of described photodiode (VD), the minus earth of the positive pole of described diode (D1) and photodiode (VD); Described phototriode (VT) intercouples with described photodiode (VD), and links to each other with the input that described spike forms circuit (4) by its emitter; Or
Described signal homophase transmission circuit (3) is an isolation drive IC, and described isolation drive IC receives drive signal (DRV) respectively and connects described spike and forms the input of circuit (4) and the output that breaking circuit (5) is forced in described synchronous rectification.
5. counter exciting synchronous rectification control circuit as claimed in claim 4 is characterized in that: the other end of described signal homophase transmission circuit (3) receives or couple drive signal (DRV).
6. counter exciting synchronous rectification control circuit as claimed in claim 4 is characterized in that: pwm signal (U1) or the outside synchronizing signal that provides are provided described signal homophase transmission circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255471 CN101951175A (en) | 2010-08-17 | 2010-08-17 | Flyback synchronous rectification control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255471 CN101951175A (en) | 2010-08-17 | 2010-08-17 | Flyback synchronous rectification control circuit |
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| CN101951175A true CN101951175A (en) | 2011-01-19 |
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| CN 201010255471 Pending CN101951175A (en) | 2010-08-17 | 2010-08-17 | Flyback synchronous rectification control circuit |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102185483A (en) * | 2011-05-09 | 2011-09-14 | 广州金升阳科技有限公司 | Synchronous rectification driving circuit of flyback converter |
| CN102545621A (en) * | 2011-11-21 | 2012-07-04 | 华为技术有限公司 | Switching power supply and control method thereof |
| CN102801286A (en) * | 2012-08-20 | 2012-11-28 | 台达电子工业股份有限公司 | Switch drive circuit |
| CN103269163A (en) * | 2013-06-03 | 2013-08-28 | 矽力杰半导体技术(杭州)有限公司 | Isolated type power circuit and circuit and method for transmitting control signals thereof |
| CN103780093A (en) * | 2012-10-19 | 2014-05-07 | 光宝科技股份有限公司 | Switching-type power supply unit |
| CN105391302A (en) * | 2015-11-13 | 2016-03-09 | 航天科工惯性技术有限公司 | Fly-back synchronous rectification control circuit |
| CN107147301A (en) * | 2017-06-22 | 2017-09-08 | 南京航空航天大学 | A kind of change ON time control method of CRM flybacks pfc converter |
| CN108418435A (en) * | 2018-04-20 | 2018-08-17 | 杭州电子科技大学 | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment |
| CN109684722A (en) * | 2018-12-24 | 2019-04-26 | 上海微阱电子科技有限公司 | It is a kind of for prevent chip system power up leak electricity design circuit |
| CN105978302B (en) * | 2016-06-17 | 2019-05-10 | 中国电子科技集团公司第二十四研究所 | A kind of pwm pulse sequential control circuit |
| CN112350581A (en) * | 2020-11-02 | 2021-02-09 | 杰华特微电子（杭州）有限公司 | Flyback circuit and control method and control circuit thereof |
| CN112688570A (en) * | 2020-12-25 | 2021-04-20 | 昂宝电子（上海）有限公司 | Flyback switching power supply and control method thereof |
| CN112886825A (en) * | 2021-04-28 | 2021-06-01 | 杭州富特科技股份有限公司 | Control method for optimizing synchronous rectification SR turn-off risk |
| CN113746360A (en) * | 2021-09-27 | 2021-12-03 | 江苏慧易芯科技有限公司 | Synchronous rectification driving voltage regulating circuit, system and regulating method |
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| CN102185483B (en) * | 2011-05-09 | 2013-07-24 | 广州金升阳科技有限公司 | Synchronous rectification driving circuit of flyback converter |
| CN102185483A (en) * | 2011-05-09 | 2011-09-14 | 广州金升阳科技有限公司 | Synchronous rectification driving circuit of flyback converter |
| CN102545621A (en) * | 2011-11-21 | 2012-07-04 | 华为技术有限公司 | Switching power supply and control method thereof |
| CN102545621B (en) * | 2011-11-21 | 2014-03-12 | 华为技术有限公司 | Switching power supply and control method thereof |
| US8884657B2 (en) | 2012-08-20 | 2014-11-11 | Delta Electronics, Inc. | Switch-driving circuit |
| CN102801286A (en) * | 2012-08-20 | 2012-11-28 | 台达电子工业股份有限公司 | Switch drive circuit |
| CN103780093A (en) * | 2012-10-19 | 2014-05-07 | 光宝科技股份有限公司 | Switching-type power supply unit |
| CN103780093B (en) * | 2012-10-19 | 2017-01-11 | 光宝电子(广州)有限公司 | Switching-type power supply unit |
| CN103269163B (en) * | 2013-06-03 | 2015-08-12 | 矽力杰半导体技术(杭州)有限公司 | Isolated power circuit and control signal transmission circuit thereof and method |
| CN103269163A (en) * | 2013-06-03 | 2013-08-28 | 矽力杰半导体技术(杭州)有限公司 | Isolated type power circuit and circuit and method for transmitting control signals thereof |
| CN105391302A (en) * | 2015-11-13 | 2016-03-09 | 航天科工惯性技术有限公司 | Fly-back synchronous rectification control circuit |
| CN105978302B (en) * | 2016-06-17 | 2019-05-10 | 中国电子科技集团公司第二十四研究所 | A kind of pwm pulse sequential control circuit |
| CN107147301A (en) * | 2017-06-22 | 2017-09-08 | 南京航空航天大学 | A kind of change ON time control method of CRM flybacks pfc converter |
| CN107147301B (en) * | 2017-06-22 | 2019-04-23 | 南京航空航天大学 | A kind of change turn-on time control method of CRM flyback pfc converter |
| CN108418435A (en) * | 2018-04-20 | 2018-08-17 | 杭州电子科技大学 | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment |
| CN108418435B (en) * | 2018-04-20 | 2023-11-17 | 杭州电子科技大学 | Synchronous rectification flyback DC-DC power supply conversion device |
| CN109684722A (en) * | 2018-12-24 | 2019-04-26 | 上海微阱电子科技有限公司 | It is a kind of for prevent chip system power up leak electricity design circuit |
| CN109684722B (en) * | 2018-12-24 | 2022-12-27 | 上海微阱电子科技有限公司 | Design circuit for preventing electric leakage in power-on process of chip system |
| CN112350581A (en) * | 2020-11-02 | 2021-02-09 | 杰华特微电子（杭州）有限公司 | Flyback circuit and control method and control circuit thereof |
| CN112350581B (en) * | 2020-11-02 | 2022-02-15 | 杰华特微电子股份有限公司 | Flyback circuit and control method and control circuit thereof |
| CN112688570A (en) * | 2020-12-25 | 2021-04-20 | 昂宝电子（上海）有限公司 | Flyback switching power supply and control method thereof |
| CN112886825A (en) * | 2021-04-28 | 2021-06-01 | 杭州富特科技股份有限公司 | Control method for optimizing synchronous rectification SR turn-off risk |
| CN112886825B (en) * | 2021-04-28 | 2021-08-17 | 杭州富特科技股份有限公司 | Control method for optimizing synchronous rectification SR turn-off risk |
| CN113746360A (en) * | 2021-09-27 | 2021-12-03 | 江苏慧易芯科技有限公司 | Synchronous rectification driving voltage regulating circuit, system and regulating method |
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Application publication date: 20110119 |