CN106533137A - Synchronous rectification drive circuit suitable for wide input voltage range and wide output range - Google Patents

Synchronous rectification drive circuit suitable for wide input voltage range and wide output range Download PDF

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Publication number
CN106533137A
CN106533137A CN201611263689.2A CN201611263689A CN106533137A CN 106533137 A CN106533137 A CN 106533137A CN 201611263689 A CN201611263689 A CN 201611263689A CN 106533137 A CN106533137 A CN 106533137A
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resistance
signal
mosfet
voltage
diode
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CN201611263689.2A
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CN106533137B (en
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韩苏林
丁旭
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TIANSHUI 749 ELECTRONIC CO Ltd
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TIANSHUI 749 ELECTRONIC CO Ltd
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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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a synchronous rectification drive circuit suitable for a wide input voltage range and a wide output range. The synchronous rectification drive circuit comprises a transformer coupling signal collection circuit, two independent MOSFET drivers and a bootstrap boost control circuit, wherein a drive transformer of the transformer coupling signal collection circuit collects a drive waveform of a preceding-stage PWM drive chip of a switching power supply and is synchronously coupled to an output end; the waveform is divided into two by a signal through the independent MOSFET drivers, and meanwhile, a backing-stage synchronous rectifier tube is provided with a drive signal; the two independent MOSFET drivers are connected with the bootstrap boost control circuit; and the bootstrap boost control circuit provides the MOSFET drivers with drive and control functions. The drive signal of the synchronous rectifier tube is provided by the two independent MOSFET drivers separately, and the drive signal is from a control signal of preceding-stage PWM drive, so that the working synchronization degree of the synchronous rectification drive circuit and a preceding-stage switch tube is high, the time delay is small, and the MOSFET drivers are provided with additional boost drive control by bootstrap boost control, and the accuracy of a working time sequence is ensured.

Description

Suitable for wide input voltage range and the synchronous rectification driving circuit of wide range output
Technical field
The invention belongs to drive circuit technical field, and in particular to a kind of defeated suitable for wide input voltage range and wide scope The synchronous rectification driving circuit for going out.
Background technology
With communication and the fast development of computer technology, low-voltage, high-current Switching Power Supply application is more and more extensive.In order to The demand of high power high current is adapted to, Power Engineer are devoted to the lifting of power-efficient all the time.Raising efficiency is wanted first Overall losses during power work are reduced, the loss of power supply is mainly made up of 3 parts：The loss of power switch pipe, high frequency become The loss of depressor, the loss of output end rectifying tube.In the case of low-voltage, High-current output, the conducting pressure of commutation diode Drop is higher, and the loss of output end rectifying tube is especially prominent.Fast recovery diode（FRD）Or Ultrafast recovery diode（SRD）It is reachable 1.0-1.2V, even if using the Schottky diode of low pressure drop（SBD）, the pressure drop of about 0.6V can be also produced, this results in whole Stream loss increase, power-efficient are reduced.
Synchronous rectification is, using the extremely low special power MOSFET of on state resistance, to replace commutation diode to reduce rectification One new technology of loss.It can greatly improve the efficiency of DC/DC converters and not exist by Schottky barrier voltage and make Into dead zone voltage.Power MOSFET belongs to voltage-controlled device, and its C-V characteristic in conducting is linear.Hard When rate MOSFET makees rectifier, it is desirable to which grid voltage synchronous with the phase place holding for being rectified voltage just must can complete rectification work( Can, therefore referred to as synchronous rectification.But as MOSFET is active device, need to access driving voltage during work, as traditional Single-ended forward type self-powered synchronous rectification（Fig. 1）, the driving of rectification MOSFET pipes is directly by transformer-secondary voltage offer.This circuit Advantage be that circuit is very simple, it is not necessary to extra drive circuit just can be with normal work, but shortcoming is exactly two The driver' s timing of MOSFET is not accurate enough, and MOSFET can not replace diode rectification in whole cycle so that load current stream The time of Jing parasitic diodes is longer, causes compared with lossy, limits improved efficiency.This kind of circuit is due to directly utilizing in addition Secondary voltage is driven, and the safe driving voltage of grid source electrode of MOSFET pipes is usually required that as 20V once, and this is also just greatly Limit the range of application of the circuit.
If using outside independent drive circuit scheme, the external circuit for requiring is more complicated, and drive loss Also larger, simultaneously because generally outside is special chip, expensive, the driving force that can be provided is also very limited.
The content of the invention
The technical problem to be solved is prime sampling for shortcoming of the prior art and in providing, and front Level control system matching degree is high, while the FET for adopting is voltage-type device, delay time is little, and dynamic response is high, drives Voltage stabilization, drive loss are little, and the synchronization for being applicable to the application scenario of wide input voltage range and wide range output voltage is whole Stream drive circuit.The drive signal of synchronous rectifier of the present invention is provided respectively by two independent mosfet drivers, the driving Signal comes from the control signal that the PWM of prime drives, therefore degree synchronous with the work of prime switching tube is high, and time delay is little, bootstrap type Boosting rectifier control provides extra boosting drive control for mosfet driver, it is ensured that work schedule it is accurate.
Technical problem to solve the present invention is adopted the following technical scheme that：
It is a kind of suitable for wide input voltage range and the synchronous rectification driving circuit of wide range output, including transformer coupled signal Acquisition Circuit, two independent mosfet drivers, bootstrap type boost control circuit, the drive of transformer coupled signal acquisition circuit Dynamic transformer gathers the drive waveforms of Switching Power Supply prime PWM driving chip, and is synchronously coupled to output end, and the signal passes through two Waveform is divided into two by individual independent mosfet driver, while providing drive signal for rear class synchronous rectifier；It is described two Independent mosfet driver is connected with Bootstrap control circuit, and Bootstrap control circuit provides drive for mosfet driver Dynamic and control function.
The transformer coupled signal acquisition circuit includes transformer BT1 and electric capacity C2, electric capacity C3, concrete method of attachment For：The driving square-wave signal of 6 pin of one end connection pwm driver of electric capacity C1, wherein pwm driver model UC2843, electricity Hold one end of the armature winding of another termination transformer BT1 of C1, another termination input ground of the armature winding of transformer BT1 becomes The secondary of depressor BT1 is two identical winding N1 and winding N2, and winding N1 is connected and is grounded with one end of winding N2, winding N2's One end of another termination capacitor C2, one end of another termination capacitor C3 of winding N3, electric capacity C2, electric capacity C3 are driven with MOSFET respectively Dynamic device and the connection of Bootstrap control circuit.
Described two independent mosfet drivers are respectively the first mosfet driver and the second mosfet driver, the One mosfet driver includes MOSFET pipe T2, the resistance R8 of N-channel MOS FET pipes T1 and P-channel, the second mosfet driver Including the MOSFET pipe T4 of N-channel MOS FET pipes T3 and P-channel, and resistance R9；Wherein T1 source grounds, T1 drain electrodes are INA controls Signal output part processed, while T1 drain electrodes are connected with R8 resistance one end, the R8 resistance other end is connected with T2 drain electrodes, T1 grids, T2 grid Extremely be connected and be connected with bootstrap type boost control circuit one end, T3 grids be connected with T4 grids and with bootstrap type boost control circuit The other end is connected, T4 source grounds, and T4 drain electrodes are INB control signal outputs, while T4 drain electrodes are connected with R9 resistance one end, The R9 resistance other end is connected with T3 drain electrodes, and T3 source electrodes are connected electric with R5 with C4 electric capacity in bootstrap type boost control circuit with T2 source electrodes One end of resistance is connected.
The bootstrap type boost control circuit includes diode D1, diode D2, diode D3, diode D4, electric capacity C4 And resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7 composition；Wherein one end of resistance R4, resistance One end of R1, the anode of diode D1, the other end phase of the negative electrode of diode D2 and C2 in transformer coupled signal acquisition circuit Even；The other end ground connection of resistance R1, the negative electrode of diode D1 and one end of resistance R7, the negative electrode of diode D4 are connected；R7's is another One end is connected with one end of resistance R5, R6, R6 other ends ground connection, one end of another termination capacitors C4 of R5, and is driven with MOSFET The source electrode of T2 in device, the source electrode of T3 are connected；The other end of electric capacity C4 and the anode of diode D2, the anode of diode D3 are connected, Electric capacity in the negative electrode of diode D3, the anode of diode D4, resistance R2, one end of R3 and transformer coupled signal acquisition circuit The other end of C3 is connected, the other end ground connection of R2.
It is above-mentioned suitable for wide input voltage range and the driving method of the synchronous rectification driving circuit of wide range output：BT1 Secondary voltage obtains a DC voltage, the DC voltage on electric capacity C4 Jing after diode voltage multiplying rectifier, Jing after electric resistance partial pressure The T2 of the MOSFET of P-channel, T4 conductings are driven, while being the pull-up voltage signal as output, current step voltage is positive half cycle During the phase, MOSFET pipes T1 conductings, INA pin are pulled down ground connection, no signal output, T4 cut-offs, driving voltage Jing T3, and pull-up electricity Resistance R9 provide voltage signal for INB；When prime signal is negative half-cycle, MOSFET pipes T4 conductings, INB pin are pulled down ground connection, Without signal output, meanwhile, T1 ends, driving voltage Jing T2, and pull-up resistor R8 provides voltage signal for INA；When input letter When number alternately changing, INA and INB also obtains the square wave voltage signal of continuous alternately output；R1 wherein in circuit, R2 are grid source The discharge resistance of pole, the pull-up resistor of R8, R9 for drive voltage signal, the bleeder circuit of R5, R6, R7 composition can control C4 On voltage magnitude, by INA, the control of INB voltage magnitudes and the rate of rise is it is achieved thereby that during to synchronous rectification dead band Between precise control.
Present invention is mainly applied to the DC/DC power supplys of High-current output, for rear class circuit of synchronous rectification provide isolation, can With the synchronous rectification drive signal of precise control dutycycle and Dead Time.It is as the drive signal is sampled from prime, and front Level control system matching degree is high, while using the driver of the MOSFET compositions using N-channel and P-channel, FET is electricity Die mould device, the circuit can make drive signal be adapted to different voltage outputs by the combination of difference MOSFET pipes, utilize Bootstrap type boost rectifying circuit provides synchronous rectification drive signal simultaneously and drives the MOSFET pipes of P-channel, therefore application is more Flexibly；Make driver' s timing and Dead Time accurately adjustable by the control of voltage magnitude and slope simultaneously.The present invention it is relative with it is special It is with low cost with synchronous rectifier driver, and drive voltage signal drives direct-coupling to obtain by prime, drives time delay little, receives Output reflection noise jamming is low, while the voltage independence, is not affected by input and output voltage, dynamic response is high, drives electricity Pressure is stable, and drive loss is little, and the accurate adjustable, line loss of driver' s timing is low.
Description of the drawings
Fig. 1 is the single-ended self-device synchronous rectification circuit-line schematic diagram of prior art；
Fig. 2 is principle of the invention block diagram；
Fig. 3 is schematic circuit of the present invention.
Specific embodiment
It is most further to the present invention below in conjunction with the accompanying drawings to describe in detail：
As shown in Figure 2 and Figure 3, it is a kind of suitable for wide input voltage range and the synchronous rectification driving circuit of wide range output, including Transformer coupled signal acquisition circuit, two independent mosfet drivers, bootstrap type boost control circuit, transformer coupled letter The driving transformer of number Acquisition Circuit gathers the drive waveforms of Switching Power Supply prime PWM driving chip, and is synchronously coupled to output End, waveform is divided into two by the signal by two independent mosfet drivers, while providing drive for rear class synchronous rectifier Dynamic signal；Described two independent mosfet drivers are connected with Bootstrap control circuit, and Bootstrap control circuit is Mosfet driver is provided and is driven and control function.
The transformer coupled signal acquisition circuit includes transformer BT1 and electric capacity C2, electric capacity C3, concrete method of attachment For：The driving square-wave signal of 6 pin of one end connection pwm driver of electric capacity C1, wherein pwm driver model UC2843, electricity Hold one end of the armature winding of another termination transformer BT1 of C1, another termination input ground of the armature winding of transformer BT1 becomes The secondary of depressor BT1 is two identical winding N1 and winding N2, and winding N1 is connected and is grounded with one end of winding N2, winding N2's One end of another termination capacitor C2, one end of another termination capacitor C3 of winding N3, electric capacity C2, electric capacity C3 are driven with MOSFET respectively Dynamic device and the connection of Bootstrap control circuit.
Two independent mosfet drivers are respectively the first mosfet driver and the second mosfet driver, and first Mosfet driver includes MOSFET pipe T2, the resistance R8 of N-channel MOS FET pipes T1 and P-channel, the second mosfet driver bag Include the MOSFET pipe T4 of N-channel MOS FET pipes T3 and P-channel, and resistance R9；Wherein T1 source grounds, T1 drain electrodes are INA controls Signal output part, while T1 drain electrodes are connected with R8 resistance one end, the R8 resistance other end is connected with T2 drain electrodes, T1 grids, T2 grids It is connected and is connected with bootstrap type boost control circuit one end, T3 grids is connected with T4 grids and another with bootstrap type boost control circuit One end is connected, T4 source grounds, and T4 drain electrodes are INB control signal outputs, while T4 drain electrodes are connected with R9 resistance one end, R9 The resistance other end is connected with T3 drain electrodes, and T3 source electrodes are connected with T2 source electrodes and C4 electric capacity in bootstrap type boost control circuit and R5 resistance One end be connected.
The bootstrap type boost control circuit includes diode D1, diode D2, diode D3, diode D4, electric capacity C4 And resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7 composition；Wherein one end of resistance R4, resistance One end of R1, the anode of diode D1, the other end phase of the negative electrode of diode D2 and C2 in transformer coupled signal acquisition circuit Even；The other end ground connection of resistance R1, the negative electrode of diode D1 and one end of resistance R7, the negative electrode of diode D4 are connected；R7's is another One end is connected with one end of resistance R5, R6, R6 other ends ground connection, one end of another termination capacitors C4 of R5, and is driven with MOSFET The source electrode of T2 in device, the source electrode of T3 are connected；The other end of electric capacity C4 and the anode of diode D2, the anode of diode D3 are connected, Electric capacity in the negative electrode of diode D3, the anode of diode D4, resistance R2, one end of R3 and transformer coupled signal acquisition circuit The other end of C3 is connected, the other end ground connection of R2.
It is above-mentioned suitable for wide input voltage range and the driving method of the synchronous rectification driving circuit of wide range output：BT1 Secondary voltage obtains a DC voltage, the DC voltage on electric capacity C4 Jing after diode voltage multiplying rectifier, Jing after electric resistance partial pressure The T2 of the MOSFET of P-channel, T4 conductings are driven, while being the pull-up voltage signal as output, current step voltage is positive half cycle During the phase, MOSFET pipes T1 conductings, INA pin are pulled down ground connection, no signal output, T4 cut-offs, driving voltage Jing T3, and pull-up electricity Resistance R9 provide voltage signal for INB；When prime signal is negative half-cycle, MOSFET pipes T4 conductings, INB pin are pulled down ground connection, Without signal output, meanwhile, T1 ends, driving voltage Jing T2, and pull-up resistor R8 provides voltage signal for INA；When input letter When number alternately changing, INA and INB also obtains the square wave voltage signal of continuous alternately output；R1 wherein in circuit, R2 are grid source The discharge resistance of pole, the pull-up resistor of R8, R9 for drive voltage signal, the resistance determine the rate of rise of INB voltages.R5, The bleeder circuit of R6, R7 composition can control the voltage magnitude on C4, by INA, the control of INB voltage magnitudes and the rate of rise Make the precise control it is achieved thereby that to synchronous rectification Dead Time.

Claims (5)

1. a kind of suitable for wide input voltage range and the synchronous rectification driving circuit of wide range output, it is characterised in that：Including Transformer coupled signal acquisition circuit, two independent mosfet drivers, bootstrap type boost control circuit, transformer coupled letter The driving transformer of number Acquisition Circuit gathers the drive waveforms of Switching Power Supply prime PWM driving chip, and is synchronously coupled to output End, waveform is divided into two by the signal by two independent mosfet drivers, while providing drive for rear class synchronous rectifier Dynamic signal；Described two independent mosfet drivers are connected with Bootstrap control circuit, and Bootstrap control circuit is Mosfet driver is provided and is driven and control function.
2. a kind of synchronous rectification suitable for wide input voltage range and wide range output according to claim 1 drives electricity Road, it is characterised in that：The transformer coupled signal acquisition circuit includes transformer BT1 and electric capacity C2, electric capacity C3, concrete to connect Method is：The driving square-wave signal of 6 pin of one end connection pwm driver of electric capacity C1, wherein pwm driver model One end of the armature winding of another termination transformer BT1 of UC2843, electric capacity C1, another termination of the armature winding of transformer BT1 Input ground, the secondary of transformer BT1 is two identical winding N1 and winding N2, and winding N1 is connected and connects with one end of winding N2 Ground, one end of another termination capacitor C2 of winding N2, one end of another termination capacitor C3 of winding N3, electric capacity C2, electric capacity C3 point It is not connected with mosfet driver and Bootstrap control circuit.
3. a kind of synchronous rectification suitable for wide input voltage range and wide range output according to claim 1 and 2 is driven Dynamic circuit, it is characterised in that：Described two independent mosfet drivers are respectively the first mosfet driver and second Mosfet driver, the first mosfet driver include MOSFET pipe T2, the resistance R8 of N-channel MOS FET pipes T1 and P-channel, the Two mosfet drivers include the MOSFET pipe T4 of N-channel MOS FET pipes T3 and P-channel, and resistance R9；Wherein T1 source grounds, T1 drain electrodes are for INA control signal outputs, while T1 drain electrodes are connected with R8 resistance one end, the R8 resistance other end and T2 drain electrode phases Even, T1 grids, T2 grids are connected and are connected with bootstrap type boost control circuit one end, T3 grids be connected with T4 grids and with bootstrapping The formula boost control circuit other end is connected, T4 source grounds, and T4 drain electrodes are INB control signal outputs, while T4 drain electrodes and R9 Resistance one end is connected, and the R9 resistance other end is connected with T3 drain electrodes, and T3 source electrodes are connected with T2 source electrodes and bootstrap type boost control circuit Middle C4 electric capacity is connected with one end of R5 resistance.
4. a kind of synchronous rectification suitable for wide input voltage range and wide range output according to claim 3 drives electricity Road, it is characterised in that：The bootstrap type boost control circuit includes diode D1, diode D2, diode D3, diode D4, Electric capacity C4 and resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7 are constituted；Wherein the one of resistance R4 End, one end of resistance R1, the anode of diode D1, the negative electrode of diode D2 with transformer coupled signal acquisition circuit C2 it is another One end is connected；The other end ground connection of resistance R1, the negative electrode of diode D1 and one end of resistance R7, the negative electrode of diode D4 are connected； The other end of R7 is connected with one end of resistance R5, R6, R6 other ends ground connection, one end of another termination capacitors C4 of R5, and with The source electrode of T2 in mosfet driver, the source electrode of T3 are connected；The other end of electric capacity C4 and the anode of diode D2, diode D3's Anode is connected, the negative electrode of diode D3, the anode of diode D4, resistance R2, and one end of R3 and transformer coupled signals collecting are electric The other end of the electric capacity C3 in road is connected, the other end ground connection of R2.
5. a kind of synchronization suitable for wide input voltage range and wide range output according to any of the above-described claim is whole The driving method of stream drive circuit：BT1 secondary voltages are obtained on electric capacity C4 Jing after diode voltage multiplying rectifier Jing after electric resistance partial pressure One DC voltage, the T2 of the MOSFET of the direct voltage drive P-channel, T4 conducting, while being the upper pull-up voltage as output Signal, when current step voltage is positive half period, MOSFET pipes T1 conductings, INA pin are pulled down ground connection, and no signal output, T4 are cut Only, driving voltage Jing T3, and pull-up resistor R9 provide voltage signal for INB；When prime signal is negative half-cycle, MOSFET pipes T4 is turned on, and INB pin are pulled down ground connection, no signal output, meanwhile, T1 ends, driving voltage Jing T2, and pull-up resistor R8 is INA provides voltage signal；When input signal alternately changes, INA and INB also obtains the square-wave voltage letter of continuous alternately output Number；The discharge resistance of R1 wherein in circuit, R2 for grid source electrode, the pull-up resistor of R8, R9 for drive voltage signal, R5, R6, The bleeder circuit of R7 compositions can control the voltage magnitude on C4, by INA, the control of INB voltage magnitudes and the rate of rise It is achieved thereby that the precise control to synchronous rectification Dead Time.
CN201611263689.2A 2016-12-30 2016-12-30 Synchronous rectification drive circuit suitable for wide input voltage range and wide output range Active CN106533137B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305191A (en) * 1992-04-20 1994-04-19 At&T Bell Laboratories Drive circuit for zero-voltage switching power converter with controlled power switch turn-on
CN1551342A (en) * 2003-05-14 2004-12-01 ��ʽ���������Ƽ� Semiconductor device and power supply system
CN201590768U (en) * 2009-12-08 2010-09-22 佛山市顺德区和而泰电子科技有限公司 Multiple-output power circuit and device
CN105896987A (en) * 2015-03-24 2016-08-24 上海英联电子***有限公司 Flyback converter bootstrap type synchronous rectification drive circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5305191A (en) * 1992-04-20 1994-04-19 At&T Bell Laboratories Drive circuit for zero-voltage switching power converter with controlled power switch turn-on
CN1551342A (en) * 2003-05-14 2004-12-01 ��ʽ���������Ƽ� Semiconductor device and power supply system
CN201590768U (en) * 2009-12-08 2010-09-22 佛山市顺德区和而泰电子科技有限公司 Multiple-output power circuit and device
CN105896987A (en) * 2015-03-24 2016-08-24 上海英联电子***有限公司 Flyback converter bootstrap type synchronous rectification drive circuit

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