CN104539143B - The synchronous rectification control method and its control module of Switching Power Supply - Google Patents
The synchronous rectification control method and its control module of Switching Power Supply Download PDFInfo
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- CN104539143B CN104539143B CN201410809822.4A CN201410809822A CN104539143B CN 104539143 B CN104539143 B CN 104539143B CN 201410809822 A CN201410809822 A CN 201410809822A CN 104539143 B CN104539143 B CN 104539143B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
A kind of synchronous rectification control method of Switching Power Supply, mainly comprise the following steps, synchronous rectifier rate-determining steps, receive feedback signal, and Mobile state is entered according to feedback signal and judged, when feedback signal meets the dynamic control reference value of setting, synchronous rectification control signal is exported, control synchronous rectifier enters dynamic operation mode；Wherein, synchronous rectifier rate-determining steps directly respond to feedback signal, synchronous rectifier is set to start to make adjustment in main power circuit in advance, with when main power circuit is undergone mutation, synchronous rectifier has corresponding adjustment control, and when main power circuit is adjusted control, synchronous rectifier still has corresponding adjustment control.Relative to prior art, in the case that the present invention can avoid the dutycycle generation suddenly change of Switching Power Supply, phenomenon is instead filled caused by the adjustment not in time of synchronous rectifier, the reliability of synchronous rectification control is greatly improved.
Description
Technical field
The present invention relates to switch power technology field, the synchronous rectification control method of more particularly to a kind of Switching Power Supply and its
Control module.
Background technology
It is industrial and it is civilian be all frequently necessary to various grid ac voltages to become direct current, and major part is the direct current of isolation
Electricity is (general to the converter in electrical appliance at present as national standard is to the further requirement of the operating efficiency of various electrical appliances
For Switching Power Supply) conversion efficiency require more and more higher.Other countries also pay much attention to, and have been worked out very if the energy administration in the U.S.
Multi-standard carrys out the efficiency of specification switch power supply, and wherein 80PLUS series standards are very high to the efficiency requirements of power supply, more than gold medal
Power supply must use synchronous rectification (Synchronous rectifier) to meet efficiency requirements.
High efficiency switch power supply generally comprises power stage, transformer, circuit of synchronous rectification and synchronous commutating control circuit.
Generally, power stage can become input voltage alternating voltage, and alternating voltage becomes secondary alternating voltage, secondary by transformer
The DC voltage that alternating voltage is converted into expecting by circuit of synchronous rectification is added in load, and the DC voltage of expectation is typically named defeated
Go out voltage, so as to complete from the DC voltage of input to the conversion of output voltage, wherein synchronous commutating control circuit passes through control
Synchronous rectification switch pipe in circuit of synchronous rectification is turned on and off to realize synchronous rectification, instead of traditional commutation diode
To realize rectification.
Synchronous rectification is widely used technology in high efficiency switch power supply, using the extremely low metal oxygen of on state resistance
Compound semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect Transistor, referred to as
MOSFET, or metal-oxide-semiconductor) substitution commutation diode, with the overall efficiency for reducing rectifier loss, improving Switching Power Supply.
Synchronous rectification switch pipe is operated in imitative diode mode, but its conduction voltage drop is lower than diode, so improves
The overall efficiency of Switching Power Supply.Synchronous rectification switch pipe is referred to as synchronous rectifier, according to wink of the synchronous rectifier before shut-off
Between, whether the electric current for flowing through synchronous rectifier is zero, the mode of operation of Switching Power Supply where synchronous rectifier can be divided into company
Discontinuous Conduction mode (Continuous Current mode, abbreviation CCM), discontinuous mode (Discontinuous Current mode,
Abbreviation DCM) and critical conduction mode (Critical Current mode, CrCM).In ccm mode, synchronous rectification switch pipe closes
Electric current is not zero when disconnected, and under DCM/CrCM patterns, inductive current is zero when synchronous rectification switch pipe turns off.In DCM patterns
Under, output filtering circulation can be eliminated, reduces magnetic loss and switching loss, while anti-sink current is prevented, so as to improve reliability.
Because the size of Modern High-Speed super large-scale integration constantly reduces, power consumption constantly reduces, the electricity of power supply
Pressure also requires more and more lower therewith.The DC bus-bar voltage in many fields is reduced to 24V by original 48V, or even is down to 12V.Example
In computer main board, CPU operating voltage as little as 1.0V or so at present, electric current is nearly 70A, this operating voltage be exactly by
12V busbar voltage is depressured through BUCK circuits.In this system, voltage will pass through three-level and convert, the first order, by inputting
Civil power be transformed to 342V to 380V or so high direct voltage by pfc circuit (Power Factor Correction), its mesh
Raising Switching Power Supply power factor, reduce Harmonics of Input；The second level, for main power topology, half-bridge LLC is commonly used at present
Circuit (Series-Parallel Resonance Circuit), realize and be down to 12V from 380V and realize electrical isolation；3rd
Level, then it is down to 1V or so voltages through BUCK circuits by 12V.
Due to being multi-stage transformation, in order to realize the high efficiency of system, the conversion efficiency per one-level will be high, and this requires to lead
Power stage can not use traditional Schottky diode (SBD), recovery switching diode (FPD) etc. is used as output rectifying tube soon,
Its forward voltage drop is about 0.4V-0.6V, or even up to 1V, and on-state power consumption during high current is very big, in output voltage 12V main power
In the loss of level converter, main proportion will be accounted for, this one-level can improve the conversion efficiency of system using synchronous rectification.It is modern high
The supply voltage of fast integrated circuit, it has been described that, up to 1V or so, having been lowered to almost can be with the positive pressure of SBD or FRD above
Comparable degree drops.So three-level must be used to convert, 12V is down to by the third level BUCK circuits 1V or so operating voltage.
To sum up, synchronous rectification is most important in the conversion of above-mentioned three-level.
The type of drive of synchronous rectification has two kinds of voltage-type driving and current mode drive.Driven according to the gate pole of synchronous rectifier
The source of dynamic voltage, self-driven (Self driven) and outer driving (Externally driven), outer driving can be divided into again
Also known as control driving (Control driven).Combining just has multiple synchronization rectification scheme, describes individually below：
1st, outer driving synchronous rectification
The gate voltage of outer driving synchronous rectifier needs to obtain from additional peripheral hardware drive circuit.In order to realize synchronization,
Drive circuit must be controlled by the drive signal of the master power switch pipe of converter.As China Patent No. is
ZL200810092272.3 invention, it exactly instead of former synchrotrans by 71,72 the two electric capacity and obtain drive signal；
The shortcomings that outer driving synchronous rectification is that drive circuit is complicated, it is necessary to have detection control, timing logic, synchrotrans
Deng.
2nd, voltage-type (or current mode) self-device synchronous rectification
The a certain voltage or electric current in the loop where detection synchronous rectifier, the gate-drive electricity as synchronous rectifier
Pressure, referred to as voltage-type self-device synchronous rectification or current mode self-device synchronous rectification.
As China Patent No. be ZL200810004176.9 invention, exactly by drive winding Na detect synchronous rectifier
Loop voltage where SR obtains drive signal；
It is exactly synchronous whole by Current Transmit detection such as the invention that China Patent No. is ZL 200810131057.X
Loop current where flow tube SR obtains drive signal；
The major defect of self-device synchronous rectification is：
(1) different Switching Power Supplies topology is, it is necessary to use different type of drive；
(2) in certain period of time, vibration etc., influences driving voltage caused by transformer leakage inductance, reduces efficiency；
(3) all there is delay in drive circuit, and synchronous rectifier SR is there is also open time delay, when receiving cut-off signals, to same
When walking rectifying tube SR shut-off, delay all be present, cause output voltage by the synchronous rectifier SR that does not turn off in time yet to transformation
Device winding or inductance reverse power supply, efficiency is reduced, is commonly called as counter fill.Particularly underloading when, efficiency very serious in smaller dutycycle
Decline even not as the circuit using Schottky diode, it is particularly evident in the Switching Power Supply of increasingly high frequency.
Based on above-mentioned situation, prediction type control method or similar scheme are proposed in some patents, as the U.S. is special
Profit number is US6055170A invention, when exactly proposing the synchronous rectification conducting using this cycle according to the characteristic of Switching Power Supply
Between predict the synchronous rectification ON time in next cycle, so as to accomplish to be precisely controlled, and can be adaptively same under CCM, DCM
Walk the drive scheme of rectification.
Fig. 1 shows that the prediction type synchronous rectification applied to Switching Power Supply controls work wave, and wherein waveform A is synchronous whole
Voltage waveform VDS between flow tube SRMOS drain electrode and source class；Waveform B for flow through synchronous rectifier SRMOS drain electrode with source class it
Between current waveform IDS；Waveform C is synchronous rectifier SRMOS drive waveforms.From waveform it can be seen that, for Switching Power Supply
In three work periods T1, T2, T3 continuous in time, in the T1 cycles, the drive signal of synchronous rectifier was according to upper one week
The ON time of phase carries out pulse width set, because the ON time t1 in a upper cycle is shorter, is turned off in advance in the T1 cycles
Synchronous rectifier SRMOS, in the unnecessary time, electric current can only pass through now VDS from synchronous rectifier SRMOS body diode
Voltage keeps the conduction voltage drop of body diode, and the ON time of the body diode will be detected, and as next cycle
ON time predicts benchmark；Within the T2 cycles, this cycle synchronous rectifier is set after the ON time by detecting the T1 cycles
SRMOS ON time is t2, it is contemplated that synchronous rectifier SRMOS has the needs of advancement, and the time t2, which includes, to be carried
The dead time of preceding action, within the T2 cycles, because ON time is more suitable, synchronous rectifier SRMOS body diode is led
The logical time meets dead time sets requirement, in the T3 cycles, synchronous rectifier SRMOS ON time t3 substantially with t2 phases
Deng unless detecting that the ON time of synchronous rectifier SRMOS body diode does not meet dead time requirement.
And make because described prediction type control program is a kind of experience control, that is, using past ON time
Foundation is controlled for current ON time, this results in control program and exception occurs when handling the situation of suddenly change.
Fig. 2 shows the prediction type synchronous rectification control work wave under a kind of abnormal conditions, and wherein waveform A is synchronous whole
Voltage waveform VDS between flow tube SRMOS drain electrode and source class；Waveform B for flow through synchronous rectifier SRMOS drain electrode with source class it
Between current waveform IDS；Waveform C is synchronous rectifier SRMOS drive waveforms.From waveform it can be seen that, for Switching Power Supply
In three work periods T1, T2, T3 continuous in time, in the T1 cycles, the drive signal of synchronous rectifier was according to upper one week
The ON time of phase carries out pulse width set, because ON time t1 is more suitable, synchronous rectifier SRMOS body diode
ON time meets dead time sets requirement, in the T2 cycles, synchronous rectifier SRMOS ON time t2 substantially with t1 phases
Deng；However, because in the T2 cycles, suddenly change, synchronous rectifier SRMOS ON time contracting occur for the dutycycle of Switching Power Supply
It is short, in this case, synchronous rectifier SRMOS can T2 end cycles it is follow-up it is continuous be held on, and now Switching Power Supply
Main switch have been turned on, there is anti-filling phenomenon described above.
It is described shorten the time amplitude it is less in the case of, the anti-phenomenon that fills can cause loss to increase, while also result in out
Existing due to voltage spikes, the voltage stress increase of synchronous rectifier；It is described shorten the time amplitude it is larger in the case of, fill electricity due to anti-
The rate of climb of stream is very big, and it is exceeded now to easily lead to the current stress of main switch and synchronous rectifier, and then causes out
Close converter damage.
The content of the invention
Have in view of that, the invention solves above mentioned problem existing for existing circuit of synchronous rectification, there is provided a kind of Switching Power Supply
Synchronous rectification control method, be a kind of dynamic control method, the dynamic of synchronous rectifier prepared in advance by responding feedback signal
State controls, so that synchronous rectifier starts to make adjustment in main control circuit in advance, and is protected with the variation rule of main control circuit
Hold synchronization, so as to avoid the dutycycle of Switching Power Supply occur suddenly change in the case of, because synchronous rectifier adjustment not in time
Caused by it is anti-fill phenomenon, the reliability of synchronous rectification control is greatly improved.
Corresponding to this, the present invention also provides a kind of synchronous rectification control module of Switching Power Supply, with by responding feedback letter
The dynamic control of synchronous rectifier is prepared number in advance, so that synchronous rectifier starts to make adjustment in main control circuit in advance, and
It is synchronous with the variation rule holding of main control circuit, in the case of avoiding the dutycycle of Switching Power Supply that suddenly change occurs,
Phenomenon is instead filled caused by the adjustment not in time of synchronous rectifier, the reliability of synchronous rectification control is greatly improved.
For method, what the object of the invention was realized in, a kind of synchronous rectification control method of Switching Power Supply, it is used for
The synchronous rectifier of main power circuit, comprises the following steps in controlling switch power supply, sampling step, the output letter to Switching Power Supply
Number sampled, and obtained sampled signal output will be sampled；Feedback step, sampled signal is received, and according to sampled signal, it is defeated
Go out feedback signal；Synchronous rectifier rate-determining steps, feedback signal is received, and Mobile state is entered according to feedback signal and judged, work as feedback
When signal meets the dynamic control reference value of setting, synchronous rectification control signal is exported, control synchronous rectifier enters dynamic work
Operation mode；Wherein, synchronous rectifier rate-determining steps directly respond to feedback signal, make synchronous rectifier in advance in main power
Circuit starts to make adjustment, so that when main power circuit is undergone mutation, synchronous rectifier has corresponding adjustment control, and in master
When power circuit is adjusted control, synchronous rectifier still has corresponding adjustment control.
Preferably, the dynamic control reference value set in the synchronous rectifier rate-determining steps is a particular constant, or
One change amplitude.
Preferably, the dynamic operation mode of the synchronous rectifier rate-determining steps is to export the dynamic control of minimum ON time
System, or stop the dynamic control of output.
For product, the synchronous rectification control module of Switching Power Supply of the present invention, for main power in controlling switch power supply
The synchronous rectifier of circuit, including：Sampling module, the output signal of Switching Power Supply is sampled, and adopted what sampling obtained
Sample signal output；Feedback module, sampled signal is received, and according to sampled signal, output feedback signal；Synchronous rectifier controls mould
Block, feedback signal is received, and Mobile state is entered according to feedback signal and judged, when feedback signal meets the dynamic control reference value of setting
When, synchronous rectification control signal is exported, control synchronous rectifier enters dynamic operation mode；Wherein, synchronous rectifier control mould
Block directly responds to feedback signal, makes synchronous rectifier start to make adjustment in main power circuit in advance, with main power
When circuit is undergone mutation, synchronous rectifier has corresponding adjustment control, and when main power circuit is adjusted control, it is synchronous
Rectifying tube still has corresponding adjustment control.
Preferably, the dynamic control reference value set in the synchronous rectifier control module is a particular constant, or
One change amplitude.
Preferably, the dynamic operation mode of the synchronous rectifier control module is to export the dynamic control of minimum ON time
System, or stop the dynamic control of output.
Compared with prior art, the present invention has the advantages that：
Because the dynamic detection of synchronous rectifier shifts to an earlier date the adjustment control changed in main power circuit to ON time, make same
It is timely to walk the dynamic adjustment of rectifying tube, so as to ensure that Switching Power Supply exists without the anti-phenomenon that fills, greatly improves synchronous rectification
Reliability.
Brief description of the drawings
Fig. 1 is the normal work oscillogram that the existing prediction type synchronous rectification applied to Switching Power Supply controls；
Fig. 2 is the abnormal work oscillogram that the existing prediction type synchronous rectification applied to Switching Power Supply controls；
Fig. 3 is the circuit theory diagrams of the synchronous rectification control module of Switching Power Supply of the present invention；
Fig. 4 is the working waveform figure of the synchronous rectification control module of Switching Power Supply of the present invention.
Embodiment
Fig. 3 shows the circuit theory diagrams of the synchronous rectification control module of Switching Power Supply of the present invention, and synchronous rectification works in
In Switching Power Supply, synchronous rectification includes synchronous rectifier 302, applied to circuit of synchronous rectification device；Also include an integrated circuit
301, integrated circuit 301 controls synchronous rectifier, is the synchronous rectifier control module in Switching Power Supply.Switching Power Supply is at least wrapped
Sampling module 303, feedback module 304, isolation feedback circuit 305 and main control circuit 306 are included, sampling module 303 is to switch
The output signal of power supply is sampled, and output signal may be voltage signal or current signal, output signal may be voltage and
The integrated signal of electric current；Feedback module 304 receives sampled signal, and is existed according to sampled signal output feedback signal, feedback signal
Output signal changes when changing；The isolation feedback circuit 305 receives feedback signal, and gives feedback signal transmission to main control electricity
Road 306, main control circuit 306 adjust output signal according to feedback signal, so as to the work of the main power circuit of adjusting switch power supply
Working frequency or dutycycle, regulation process forms closed-loop control, so as to stablize output signal.
In this embodiment, integrated circuit 301 receives feedback signal, and enters Mobile state according to feedback signal and judge, when anti-
When feedback signal meets the dynamic control reference value of setting, synchronous rectification control signal is exported, control synchronous rectifier 302 enters dynamic
State mode of operation.Dynamic operation mode is that control exports minimum ON time, or control stops output drive signal.It is set
Dynamic control reference value can be a particular constant, or one change amplitude.
Because feedback signal needs just have influence on after the isolation feedback circuit 305 and main control circuit 306
The working frequency and dutycycle of Switching Power Supply, dynamic control signal can shift to an earlier date in the change of the working frequency and dutycycle of Switching Power Supply
Change and produce, then after certain control process, integrated circuit 301 can change it in the ON time of synchronous rectifier 302
Preceding adjustment control signal, the ON time of synchronous rectifier 302 is adjusted by the regulation of control signal, so that it is guaranteed that synchronous rectification
During the ON time change of pipe 302, synchronous rectifier 302 turns off in time, to avoid the anti-appearance for filling phenomenon.
Fig. 4 shows the working waveform figure of the synchronous rectification control module of Switching Power Supply of the present invention, and wherein waveform A is synchronous
Voltage waveform VDS between the drain electrode of rectifying tube 302 and source class；Waveform B is feedback signal；Waveform C is synchronous rectifier 302
Drive waveforms VGS.From waveform it can be seen that, Switching Power Supply dutycycle occur suddenly change in the case of, feedback signal in
Change in the work period T1 of Switching Power Supply, integrated circuit 301 can receive in the mutation cycle T 1 of Switching Power Supply
The jump signal that feedback module is beamed back, even if the ON time t1 of the synchronous rectifier 302 in the T1 cycles is more suitable, integrate electricity
Road 301 will enter Mobile state judgement according to the feedback signal received in the T1 cycles, and then export synchronous rectification control signal, control
The ON time in T2 cycles shortens, and the time after shortening is maintained into several work periods, with ensure main control circuit 306 with
When just starting to adjust dutycycle in the T3 cycles afterwards, synchronous rectifier 302 is still in the dynamic operation mode of regulation and control.I.e. in T3
In cycle, when main control circuit 306 is turned on according to the dutycycle of adjustment, synchronous rectifier 302 is then according to the control signal of adjustment
Turned off.So control, in the T2 cycles, when main control circuit 306 is undergone mutation, synchronous rectifier 302 has corresponding tune
Whole control；In the T3 cycles, when main control circuit 306 is adjusted control, synchronous rectifier 302 also has corresponding adjustment control
System, so as to avoid the dutycycle of Switching Power Supply occur suddenly change in the case of because the adjustment of synchronous rectifier 302 not in time and
Caused anti-filling phenomenon.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in embodiment disclosed and described above, to the present invention's
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although used in this specification
Some specific terms, but these terms are merely for convenience of description, do not form any restrictions to the present invention.
Claims (4)
1. a kind of synchronous rectification control method of Switching Power Supply, the synchronous rectification for main power circuit in controlling switch power supply
Pipe, it is characterised in that comprise the following steps,
Sampling step, the output signal of Switching Power Supply is sampled, and obtained sampled signal output will be sampled；
Feedback step, sampled signal is received, and according to sampled signal, output feedback signal；
Synchronous rectifier rate-determining steps, feedback signal is received, and Mobile state is entered according to feedback signal and judged, when feedback signal meets
During the dynamic control reference value of setting, synchronous rectification control signal is exported, control synchronous rectifier enters dynamic operation mode；
Wherein, synchronous rectifier rate-determining steps directly respond to feedback signal, make synchronous rectifier in advance in main power electricity
Road starts to make adjustment, so that when main power circuit is undergone mutation, synchronous rectifier has corresponding adjustment control, and in main work(
When rate circuit is adjusted control, synchronous rectifier still has corresponding adjustment control；The synchronous rectifier rate-determining steps move
State mode of operation is to export the dynamic control of minimum ON time, or stops the dynamic control of output.
2. the synchronous rectification control method of Switching Power Supply according to claim 1, it is characterised in that：The synchronous rectifier
The dynamic control reference value set in rate-determining steps is a particular constant, or a change amplitude.
3. a kind of synchronous rectification control module of Switching Power Supply, the synchronous rectification for main power circuit in controlling switch power supply
Pipe, it is characterised in that including：
Sampling module, the output signal of Switching Power Supply is sampled, and obtained sampled signal output will be sampled；
Feedback module, sampled signal is received, and according to sampled signal, output feedback signal；
Synchronous rectifier control module, feedback signal is received, and Mobile state is entered according to feedback signal and judged, when feedback signal meets
During the dynamic control reference value of setting, synchronous rectification control signal is exported, control synchronous rectifier enters dynamic operation mode；
Wherein, synchronous rectifier control module directly responds to feedback signal, makes synchronous rectifier in advance in main power electricity
Road starts to make adjustment, so that when main power circuit is undergone mutation, synchronous rectifier has corresponding adjustment control, and in main work(
When rate circuit is adjusted control, synchronous rectifier still has corresponding adjustment control；The synchronous rectifier control module is moved
State mode of operation is to export the dynamic control of minimum ON time, or stops the dynamic control of output.
4. the synchronous rectification control module of Switching Power Supply according to claim 3, it is characterised in that：The synchronous rectifier
The dynamic control reference value set in control module is a particular constant, or a change amplitude.
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| CN106452087B (en) * | 2016-10-31 | 2019-01-22 | 陕西亚成微电子股份有限公司 | A kind of method for rectifying of synchronous commutating control circuit |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780094A (en) * | 2012-10-19 | 2014-05-07 | 光宝科技股份有限公司 | Power supply conversion device |
| CN103795234A (en) * | 2012-10-31 | 2014-05-14 | 光宝科技股份有限公司 | Synchronous rectification control circuit and power conversion device |
| CN104009655A (en) * | 2014-06-13 | 2014-08-27 | 佛山市南海赛威科技技术有限公司 | Synchronous rectification control system and method based on time domain multiplier |
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| JP5867141B2 (en) * | 2012-02-17 | 2016-02-24 | ミツミ電機株式会社 | Switching power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780094A (en) * | 2012-10-19 | 2014-05-07 | 光宝科技股份有限公司 | Power supply conversion device |
| CN103795234A (en) * | 2012-10-31 | 2014-05-14 | 光宝科技股份有限公司 | Synchronous rectification control circuit and power conversion device |
| CN104009655A (en) * | 2014-06-13 | 2014-08-27 | 佛山市南海赛威科技技术有限公司 | Synchronous rectification control system and method based on time domain multiplier |
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