CN106130376A - Novel synchronous rectified system - Google Patents
Novel synchronous rectified system Download PDFInfo
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- CN106130376A CN106130376A CN201610578555.3A CN201610578555A CN106130376A CN 106130376 A CN106130376 A CN 106130376A CN 201610578555 A CN201610578555 A CN 201610578555A CN 106130376 A CN106130376 A CN 106130376A
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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
- 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
The invention discloses novel synchronous rectified system, apply at double opening and closing forward converters, including first input end, the second input and the 3rd input；Described first input end is one end of resistance R1 and R3, the resistance R1 other end is electrically connected with the non-inverting input of resistance R2 one end, amplifier OP2, the resistance R2 other end is electrically connected with the source electrode of synchronous rectification N-channel MOS pipe Q2, manganin wire Rm one end, and the resistance R3 other end is electrically connected with the inverting input of resistance R4 one end, amplifier OP2；Allow flyback power supply can be operated in discontinuous pattern DCM, also continuous mode CCM can be operated in, make Switching Power Supply when heavy duty, enter continuous mode CCM, the conversion efficiency making power supply overall is higher, applied at double opening and closing forward converters, be there is the advantage that can simultaneously operate at electric current continuous current conduction mode Yu discontinuous current conduction mode.
Description
Technical field
The present invention relates to commutation system, the most novel synchronous rectified system.
Background technology
Synchronous rectification is the special power metal-oxide-semiconductor using on-state resistance extremely low, replaces commutation diode to reduce
One new technique of rectifier loss.It can be greatly improved the power supply conversion efficiency of supply convertor.Power MOS pipe belongs to voltage control
Type device processed, when doing commutator with power MOS pipe, it is desirable to grid voltage must keep Tong Bu ability with the phase place being rectified voltage
Complete rectification function, therefore referred to as synchronous rectification.
The power supply changeover device of existing liquid display product AC-DC (AC-DC) single group output, its output uses by synchronizing whole
Flow control chip U2 controls N-channel MOS pipe Q2 and does output synchronous rectification.Such as shown in Fig. 1, this power supply changeover device also exists following
Problem:
1, inverse-excitation type synchronous rectifying control chip is also widely applied at present in inverse-excitation type switch power-supply, therefore this synchronization
The price of rectification control chip is the most expensive (such as: existing inverse-excitation type synchronous rectifying control chip price is generally beautiful 0.2～0.3
About gold).
2, the most general synchronous rectification cannot operate simultaneously lead with discontinuous current at continuous current conduction mode
Logical pattern, the major part of the synchronous rectification control chip that each producer is developed only allows to be operated in discontinuous mode DCM, and
Cannot preferably be operated in continuous mode CCM, and Switching Power Supply is operated in continuous mode CCM at whole efficiency conversion aspect less
Continuous mode DCM is high.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides and operate at continuous current conduction mode with discontinuous simultaneously
The novel synchronous rectified system of current conduction mode.
The technical solution adopted in the present invention is:
Novel synchronous rectified system, applies at double opening and closing forward converters, including first input end, the second input and the 3rd
Input；Described first input end is one end of resistance R1 and R3, the resistance R1 other end and resistance R2 one end, amplifier OP2 non-
Reverse input end is electrically connected with, and the resistance R2 other end and the source electrode of synchronous rectification N-channel MOS pipe Q2, manganin wire Rm one end are electrical
Connecting, the resistance R3 other end is electrically connected with the inverting input of resistance R4 one end, amplifier OP2, resistance R4 and manganin wire Rm's
The secondary ground of another termination, the outfan of amplifier OP2 is electrically connected with the grid of Q3N channel MOS, the drain electrode of Q3N channel MOS and
The drain electrode of N-channel MOS Q4, resistance R5 one end, the grid of synchronous rectification N-channel MOS Q2 are electrically connected with, synchronous rectification N-channel
The drain electrode of MOSQ2 is electrically connected with as described second input, the resistance R5 other end and a diode D2 negative terminal, and diode D2 is just
End is electrically connected with and as described 3rd input with diode D1 anode, resistance R6 one end；The resistance R6 other end and resistance R7
One end, amplifier OP1 reverse input end are electrically connected with, diode D1 negative terminal and one end of electric capacity C1, amplifier OP1 and the power supply of OP2
End is electrically connected with, and the outfan of amplifier OP1 is electrically connected with the grid of Q4N channel MOS, and the other end of electric capacity C1, resistance R7 are another
The source electrode of one end, the non-inverting input of amplifier OP1, amplifier OP1 and the earth terminal of OP2, Q3 and Q4N channel MOS tube connects secondary
Ground.
Further, comparator OC1, OC2 is used to replace described amplifier OP1 and OP2, and at described comparator OC1, OC2
Output termination one pull-up resistor.
Beneficial effects of the present invention:
1, amplifier OP or comparator OC is used to control devices and reduce the Switching Power Supply with synchronous rectification
Design cost, such as: using LM358 to be internally integrated 2 amplifiers OP, its single OP price is within 0.05 U.S. dollar.
2, flyback power supply is allowed can be operated in discontinuous pattern DCM, it is possible to be operated in continuous mode CCM, make Switching Power Supply
When heavy duty, entering continuous mode CCM, the conversion efficiency making power supply overall is higher, is applied and changes at double opening and closing forward types
Device, has the advantage that can simultaneously operate at electric current continuous current conduction mode Yu discontinuous current conduction mode.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described further.
Fig. 1 is existing flyback power supply schematic block circuit diagram.
Fig. 2 is the circuit connection diagram of the novel synchronous rectified system controlled by amplifier OP.
Fig. 3 is the flyback power supply schematic block circuit diagram of application drawing 2.
Fig. 4 is inverse-excitation type switch power-supply sequential chart when being operated in continuous mode (CCM).
Fig. 5 is inverse-excitation type switch power-supply sequential chart when being operated in discontinuous mode (DCM).
Fig. 6 is the examples of implementation theory diagram that flyback power supply circuit uses comparator OC.
Detailed description of the invention
As in figure 2 it is shown, the present invention provides novel synchronous rectified system, apply at double opening and closing forward converters, including
One input, the second input and the 3rd input；Described first input end is one end of resistance R1 and R3, the resistance R1 other end
Being electrically connected with the non-inverting input of resistance R2 one end, amplifier OP2, the resistance R2 other end is with synchronous rectification N-channel MOS Q2's
Source electrode, manganin wire Rm one end are electrically connected with, and the resistance R3 other end electrically connects with resistance R4 one end, the inverting input of amplifier OP2
Connect, the secondary ground of another termination (the most secondary ground, flyback transformer primary side ground) of resistance R4 and manganin wire Rm, amplifier OP2
The grid of outfan and Q3N channel MOS be electrically connected with, drain electrode and the drain electrode of a Q4N channel MOS, the resistance of Q3N channel MOS
R5 one end, the grid of synchronous rectification N-channel MOS Q2 are electrically connected with, and the drain electrode of synchronous rectification N-channel MOS Q2 is as described second
Input, the resistance R5 other end and a diode D2 negative terminal are electrically connected with, diode D2 anode and diode D1 anode, resistance R6
One end is electrically connected with and as described 3rd input；The resistance R6 other end and resistance R7 one end, amplifier OP1 reverse input end electricity
Property connect, the feeder ear of diode D1 negative terminal and one end of electric capacity C1, amplifier OP1 and OP2 is electrically connected with, the output of amplifier OP1
End is electrically connected with the grid of Q4N channel MOS, the other end of electric capacity C1, the resistance R7 other end, the non-return input of amplifier OP1
The source electrode of end, amplifier OP1 and the earth terminal of OP2, Q3 and Q4N channel MOS tube connects secondary ground.
It addition, the present embodiment provides a kind of flyback power supply, this power supply includes above-mentioned inverse-excitation type synchronous rectifying circuit, please
With reference to Fig. 3, in figure, AC mains (90Vrms～264Vrms) is supplied to bridge-type after EMI filter circuit 1 carries out EMI filtering
Rectification circuit 2 carries out all wave rectification, then generation one has certain voltage after power frequency electrolytic capacitor filter Cb carries out power frequency filtering
The unidirectional current of ripple provides input electric energy for flyback transformer T1, and the negative pole of power frequency electrolytic capacitor filter Cb is with connecing primary (anti-
Swash the most primary ground, formula transformer primary ground), power frequency electrolytic capacitor filter Cb positive pole and flyback transformer T1 primary side
The non-dotted end of winding Np is electrically connected with, and the dotted end of Np is electrically connected with the drain electrode of Q1N channel MOS, the grid of Q1N channel MOS
Pole is electrically connected with the output pin of PWM controller U1, and the source electrode of Q1N channel MOS connects primary ground, normal in this Switching Power Supply
During work, the output pin of PWM controller U1 will export a PWM pulse-width signal, be controlled by this PWM pulse-width signal
Make this Q1N channel MOS tube and do Push And Release action, thus control this flyback transformer T1 and from primary side Np winding, power frequency is filtered
Electric energy on electrochemical capacitor Cb is transferred to output filter circuit 4 by primary side winding Ns;The primary side winding Ns of transformator T1
Dotted end and one end of resistance R1 and R3, the anode of electric capacity C2, one end of inductance L1 be electrically connected with, the other end of inductance L1 with
The anode of electric capacity C3 is electrically connected with, and this C3 anode is the outfan of this inverse-excitation type switch power-supply, and exporting a voltage is the straight of Vout
Flowing electricity, the resistance R1 other end is electrically connected with the non-inverting input of resistance R2 one end, amplifier OP2, and the resistance R2 other end is with same
The step source electrode of rectification N-channel MOS Q2, manganin wire Rm one end are electrically connected with, the resistance R3 other end and resistance R4 one end, amplifier OP2
Inverting input be electrically connected with, the resistance R4 other end, electric capacity C2 and C3 negative terminal meet secondary ground, the outfan of amplifier OP2 and Q3N
The grid of channel MOS is electrically connected with, the drain electrode of Q3N channel MOS and the drain electrode of a Q4N channel MOS, resistance R5 one end, synchronize whole
The grid of stream N-channel MOS Q2 is electrically connected with, the drain electrode of synchronous rectification N-channel MOS Q2 and the primary side of flyback transformer T1 around
The non-dotted end of group Ns is electrically connected with, and the resistance R5 other end and a diode D2 negative terminal are electrically connected with, diode D2 anode and two
The dotted end of the detecting winding Nd of pole pipe D1 anode, resistance R6 one end and flyback transformer is electrically connected with, the resistance R6 other end
Be electrically connected with resistance R7 one end, amplifier OP1 reverse input end, diode D1 negative terminal and one end of electric capacity C1, amplifier OP1 and
The feeder ear of OP2 is electrically connected with, and the outfan of amplifier OP1 is electrically connected with the grid of Q4N channel MOS, the other end of electric capacity C1,
The detecting non-dotted end of winding Nd, the resistance R7 other end, the non-inverting input of amplifier OP1, amplifier OP1 and the earth terminal of OP2,
The source electrode of Q3 and Q4N channel MOS tube connects secondary ground, and wherein Q3/Q4 available rates is cheap such as: the models such as RK7002 or 2N7002
Electronic component.
When this inverse-excitation type switch power-supply is operated in continuous mode (CCM), refer to Fig. 4 sequential chart；
During Ton: the outfan of PWM controller U1 exports a high level High signal to the grid of Q1N channel MOS, Q1N raceway groove
Obtain between grid and the source electrode of MOS a voltage be Vgs (Q1)=VH[VH be high level on signal] so that Q1N channel MOS is led
Logical, make transformator T1 primary side winding Np non-dotted end and dotted end between produce a voltage VNp=VCb=Lp*di/dt=
Lp* (Ip-Ip0)/Ton, [wherein: VCb is the power frequency electrolytic capacitor filter Cb anode voltage to primary ground, Lp is that inverse-excitation type becomes
The inductance value of depressor T1Np winding, di/dt is to flow into from the non-dotted end of Np winding, from the electric current of Np winding dotted end outflow at list
The increments of bit time, Ip is end primary side winding Np electric current during Ton, and Ip0 is initial current during Ton], and inverse-excitation type
Transformator T1 starts energy storage, the polarities of potentials of the non-dotted end of flyback transformer T1 primary side winding Np be "+", Np gets ready
Terminal potential polarity is "-", according to transformator Same Name of Ends principle, now in primary side winding Ns and the detecting of flyback transformer T1
The induced polarities of potentials of non-dotted end of winding Nd be also "+", transformator T1 primary side winding Ns and detecting winding Nd
The induced polarities of potentials of dotted end be also "-", non-due to detecting winding Nd gets the secondary ground of termination ready, therefore at detecting winding
The dotted end of Nd produces a voltage VNd=-VCb*Nd/Np, [wherein Nd is the number of turns of detecting winding Nd of flyback transformer T1,
Np is the number of turns of the primary side winding Np of flyback transformer T1], the reverse input end in amplifier OP1 produces a voltage V-simultaneously
(OP1)=VNd*R7/ (R6+R7) < V+ (OP1)=0V, [wherein V+ (OP1) is amplifier OP1 non-inverting input voltage], make amplifier
OP1 outfan exports the high level signal grid to Q4N channel MOS tube, it may be assumed that between the grid of Q4N channel MOS tube and source electrode
Voltage to a voltage Vgs (Q4)=VH so that Q4MOS pipe quickly conducting so that the gate charge quilt of devices
Quickly release, it may be assumed that when Q1N channel MOS turns on, Q2N channel MOS is quickly ended, to guarantee in output filter circuit 4
Electric energy will not again pour in down a chimney cause in flyback transformer T1 Q2N channel MOS tube cut-off time, this MOS drain electrode with
Produce between source electrode higher peak voltage make this Q2MOS pipe because of pressure deficiency breakdown problem.
End during Ton, it is Ip that the electric current that the primary side winding Np of transformator T1 flows through reaches maximum, and transformator is deposited
The energy of storage is WTon=1/2*Lp*Ip2-1/2*Lp*Ip02.
During Toff: the outfan of PWM controller U1 exports a low level Low signal to the grid of Q1N channel MOS, Q1N
Between grid and the source electrode of channel MOS, voltage becomes Vgs (Q1)=VL=0V[VL is low level Low signal] so that Q1N raceway groove
Metal-oxide-semiconductor ends, and when Q1N channel MOS tube ends, flyback transformer all windings polarities of potentials inverts, it may be assumed that inverse-excitation type transformation
Device T1Np winding, Ns winding, Nd winding non-dotted end polarities of potentials from "+" become "-", flyback transformer T1Np winding,
Ns winding, Nd winding dotted end polarities of potentials from "-" become "+", now Q2N channel MOS tube parasitic diode DQ2 elder generation forward
Conducting so that transformator T1 primary side winding Ns starts the electromagnetic energy release stored during Ton by flyback transformer T1
Out, and produce an electric current Is path: secondary ground → Rm manganin wire → DQ2 anode → DQ2 negative terminal → flyback transformer T1Ns
The dotted end of the non-dotted end of winding → flyback transformer T1Ns winding → electric capacity C2 anode and inductance L1;Electric current flows through copper-manganese
Line Rm produces negative pressure Vs=-Is*Rm at the source electrode of Q2N channel MOS, [wherein Rm is the resistance of manganin wire], and in amplifier OP2
Non-inverting input produce a voltage and be:
V+ (OP2)=VC2*R2/ (R1+R2)-Is*Rm*R1/ (R1+R2), and produce a voltage at the reverse input end of amplifier OP2
For V-(OP2)=VC2*R4/ (R3+R4), due to examine filter to transformator T1 be operated in discontinuous mode DCM time, when Q1N raceway groove
MOS ends period Toff, flyback transformer T1 can be just by air gap institute in this flyback transformer T1 within less than the Toff time
Storage energy all discharge complete, i.e. during Toff in, Is electric current can become 0A, in order to prevent transformator T1 to release at energy
The electric energy in output filter circuit 4 may be made after discharging again to pour in down a chimney in flyback transformer T1 and to cause Q2N channel MOS tube
Cut-off time, produce between the drain electrode and source electrode of this MOS higher peak voltage make this Q2N channel MOS tube because of pressure not
Sufficient and breakdown problem, therefore need at Is electric current close to after 0A, amplifier OP2 outfan needs to export a high level signal to be made
Q2N channel MOS is quickly ended, so as Is=0A, needing to meet V+(OP2)-V-(OP2) > Vio[wherein Vio for fortune
Put the input offset voltage (Inputoffsetvoltage) of OP], such as: the Vio=2mV that LM358A is transported into, therefore can be by arranging ginseng
Number, such as: Rm=24m Ω, R1=R3=15K Ω, R2=27 Ω, R4=22 Ω, if VC2=16V, then at V+(OP2)=V-(OP2)+
5.3mV, it may be assumed that VC2*R2/ (R1+R2)=VC2*R4/ (R3+R4)+5.3mV,
Therefore when Q1N channel MOS ends,
V+(OP2)=VC2*R2/(R1+R2)-Is*Rm*R1/(R1+R2)
=VC2*R4/(R3+R4)+5.3mv-Is*Rm*R1/(R1+R2)
=V-(OP2)+5.3mv-Is*Rm*R1/(R1+R2)
If during Is=5A, V+(OP2)=V-(OP2)-114.48mV i.e.: amplifier OP2 reverse input end voltage is more than non-return input
Terminal voltage so that amplifier OP2 outfan exports a low level signal and Q3N channel MOS is ended.Flyback transformer T1 simultaneously
Detecting winding Nd dotted end will sensing one voltage VNd=VC2*Nd/Ns, [wherein VC2 is electric capacity C2 anode to secondary ground
Voltage, Nd is the number of turns of flyback transformer T1 detecting winding, and Ns is the number of turns of flyback transformer T1 primary side winding Ns],
And produce a voltage V-(OP1 at the reverse input end of amplifier OP1)=VNd*R7/ (R6+R7) > V+(OP1)=0V, that is: amplifier OP1
Reverse input end voltage more than non-inverting input voltage so that OP1 outfan exports a low level signal and makes Q4N raceway groove
MOS ends.With simultaneously now, the voltage VNd=VC2*Nd/Ns that the detecting winding Nd dotted end of transformator T1 is sensed is through two poles
Pipe D2 and resistance R5 is supplied to Q2N channel MOS tube grid, makes Q2N channel MOS tube fast conducting, and produces an electric current Is path
Non-for: secondary ground → Rm manganin wire → Q2N channel MOS source electrode → Q2N channel MOS drain electrode → flyback transformer T1Ns winding
The dotted end of dotted end → flyback transformer T1Ns winding → electric capacity C2 anode and inductance L1.
During Toff, the electric current Is of the primary side winding Ns of transformator T1 flows through Q2N channel MOS parasitic diode DQ2
Time be the ofest short duration Δ t time, and Is electric current can be from the source electrode of Q2N channel MOS tube in the Toff-Δ t time
And flow through between Lou Ji, owing to the conduction impedance RDS (ON) of this metal-oxide-semiconductor generally only has the most such as: 10m Ω～40m about Ω, if: RDS
(ON)=20m Ω, Rm=24m Ω, Is=5A, then the loss PMOS=IS2* in this circuit of synchronous rectification (RDS (ON)+Rm)=
1.1W, and if when using existing 20A/200V Schottky diode to do output rectification, if this Schottky diode forward conduction pressure
When reducing to VF=0.6V, then the power being lost on this Schottky diode is at least up to more than Pdiode=VF*IS=3W.
End during Toff, the electric current that the primary side winding Ns of flyback transformer T1 flows through is reduced to Is2 by Is1, becomes
The energy that depressor is discharged is WToff=1/2*Ls*Is12-1/2*Ls*Is22, and [Ls is the primary side winding Ns of transformator T1
Sensibility reciprocal], and equal to the energy WTon of storage during Ton.
When this inverse-excitation type switch power-supply is operated in discontinuous mode (DCM), refer to lower Fig. 5 sequential chart.
Operating principle during Q1N channel MOS Ton is consistent with Fig. 4, but [Toff=t1 during Q1N channel MOS Toff
+ t2] time different from Fig. 4, when Q1N channel MOS from conducting become cut-off time, flyback transformer T1 all windings polarities of potentials is anti-
Turn, it may be assumed that the Np winding of flyback transformer T1, Ns winding, Nd winding non-dotted end polarities of potentials from "+" become "-", flyback
The Np winding of formula transformator T1, Ns winding, Nd winding dotted end polarities of potentials from "-" become "+", flyback transformer T1 exists
The energy stored during the conducting of Q1N channel MOS is discharged by Ns winding, when at t1 end, flows through flyback transformer T1
Ns winding current Is equal to or during substantially close to 0A, transformator T1 releases energy substantially, now amplifier OP2 non-instead
A voltage V+(OP2 is produced to input) than reverse input end voltage V-(OP2) it is approximately more than about 5.3mV, it may be assumed that V+(OP2)=V-
(OP2)+5.3mV, makes amplifier OP2 outfan export a high level signal so that Q3N channel MOS tube turns on so that synchronous rectification
N-channel MOS Q2 gate charge is quickly released complete, it may be assumed that and when Is electric current is become 0A from Isp [during Isp is Toff, flyback
The Ns winding initial current of formula transformator T1], Q2N channel MOS is quickly ended, to prevent this flyback transformer T1 at energy
Amount may make the electric energy in output filter circuit 4 again pour in down a chimney in transformator T1 to cause Q2MOS pipe in cut-off after releasing
Time, between the drain electrode and source electrode of this MOS, produce higher peak voltage make that this Q2MOS pipe is breakdown because of pressure deficiency asks
Topic.
During t2: the electromagnetic energy in transformator T1 is all released complete, owing to this transformator T1 armature winding Np deposits
There is output capacitance COSS at leakage inductance LK'Q1N channel MOS, and transformator T1 exists stray capacitance Cp so that inverse-excitation type transformation
The dotted end of device T1 produces a ringing waveform caused by LC resonance.
And this inverse-excitation type switch power-supply is when being operated in discontinuous mode, during Ton, flyback transformer T1 is stored
Energy is: WTon=1/2*LP*Ip2[Ip is the electric current that the Ton later and decadent stage of a school of thought crosses the Np winding of flyback transformer T1] and during Toff
The energy that transformator T1 is discharged is: WToff=1/2*Ls*Isp2 and in whole cycle T [T=Ton+Toff] transformator
Energy storage is as the size that releases energy.By using this synchronous rectification, the conversion efficiency of power supply is made to have obtained bigger proposing
Rise, design because have employed cheap amplifier OP or comparator OC simultaneously, make designed power supply product in price
Also the biggest competitiveness.
In an alternative embodiment of the invention, OP1 Yu the OP2 amplifier during the difference of Fig. 6 Yu Fig. 3 is artwork 3 is by comparator
OC replaces, and due to comparator output usually open collector or open-drain pole mode, therefore needs on comparator OC1 outfan adds one
Connecting resistance R8, connecting resistance R9 on comparator OC2 outfan adds.
The foregoing is only the preferred embodiments of the present invention, the present invention is not limited to above-mentioned embodiment, as long as with substantially
Same approach realizes within the technical scheme of the object of the invention broadly falls into protection scope of the present invention.
Claims (2)
- The most novel synchronous rectified system, applies at double opening and closing forward converters, it is characterised in that: include first input end, Two inputs and the 3rd input；Described first input end is one end of resistance R1 and R3, the resistance R1 other end and resistance R2 mono- End, the non-inverting input of amplifier OP2 are electrically connected with, the resistance R2 other end and the source electrode of synchronous rectification N-channel MOS pipe Q2, manganese Copper cash Rm one end is electrically connected with, and the resistance R3 other end is electrically connected with the inverting input of resistance R4 one end, amplifier OP2, resistance The secondary ground of another termination of R4 and manganin wire Rm, the outfan of amplifier OP2 is electrically connected with the grid of Q3N channel MOS, Q3N ditch The drain electrode of road MOS is electrically connected with the drain electrode of a N-channel MOS Q4, resistance R5 one end, the grid of synchronous rectification N-channel MOS Q2, The drain electrode of synchronous rectification N-channel MOS Q2 electrically connects as described second input, the resistance R5 other end and a diode D2 negative terminal Connecing, diode D2 anode is electrically connected with and as described 3rd input with diode D1 anode, resistance R6 one end；Resistance R6 is another One end is electrically connected with resistance R7 one end, amplifier OP1 reverse input end, diode D1 negative terminal and one end of electric capacity C1, amplifier OP1 Being electrically connected with the feeder ear of OP2, the outfan of amplifier OP1 is electrically connected with the grid of Q4N channel MOS, another of electric capacity C1 End, the resistance R7 other end, the non-inverting input of amplifier OP1, amplifier OP1 and the earth terminal of OP2, Q3 and Q4N channel MOS tube Source electrode connects secondary ground.
- Novel synchronous rectified system the most according to claim 1, it is characterised in that: use comparator OC1, OC2 to replace institute State amplifier OP1 and OP2, and terminate a pull-up resistor in the output of described comparator OC1, OC2.
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| CN104578794A (en) * | 2013-10-28 | 2015-04-29 | 通用电气公司 | Synchronous rectification electrical energy conversion device, driving circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107577181A (en) * | 2017-08-30 | 2018-01-12 | 苏州麦喆思科电子有限公司 | A kind of civil power household electricity control system using conjunction inside back cover pole pipe |
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