CN207200596U - Circuit of synchronous rectification - Google Patents
Circuit of synchronous rectification Download PDFInfo
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- CN207200596U CN207200596U CN201721196588.8U CN201721196588U CN207200596U CN 207200596 U CN207200596 U CN 207200596U CN 201721196588 U CN201721196588 U CN 201721196588U CN 207200596 U CN207200596 U CN 207200596U
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- 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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Abstract
The utility model provides a kind of circuit of synchronous rectification, including：Pwm control circuit, driving expand current circuit, isolation synchronous circuit, power driving circuit and synchronous rectification filter circuit；Pwm control circuit is used to produce the square wave driving signal that dutycycle is no more than 50%；Driving expands current circuit and is used to expand stream；Horizontal high voltage half-bridge is two-tube and four the synchronous of low-voltage rectifier tubes drive for six road isolation and amplifiers of signal point to be gone forward side by side for isolation synchronous circuit；Power driving circuit is used to allow main power transformer to carry out pulse power transmission the pulse signal driven power switch pipe for isolating synchronous circuit output；It is that positive and negative direct voltage output is realized in electric capacity charging that synchronous rectification filter circuit, which is used for synchronization pulse driven rectifying tube,.The circuit of synchronous rectification can realize the isolation drive demand of a variety of circuits, and drive waveforms are easy to Synchronization Control, line construction simple and stable.
Description
Technical field
Power electronics drive circuit technical field is the utility model is related to, more particularly, to circuit of synchronous rectification.
Background technology
In order to meet rigors of the audio-frequency power amplifier to high power switching power supply, take into account small volume, cost it is low, effect
The demands such as rate is high, interference is small, reliability is high, need to avoid PWM (Pulse Width Modulation, pulse width modulation) or
PFM (Pulse Frequency Modulation, pulse frequency modulated) circuit modulation switch pipe and power transformation in underloading
Harmonic disturbance caused by device causes larger interference to out-put supply, at present the general PWM lines for using open loop (non-voltage stabilizing control)
Road carries out power conversion, in the electric power conversion circuit topology of this open loop, is often synchronously driven using more transformers connected in parallel
Dynamic, not only cost is higher for this, busy line plate bulk is larger and drive output uniformity is bad.
Utility model content
The purpose of this utility model is in view of the shortcomings of the prior art, there is provided a kind of circuit of synchronous rectification, this is synchronous whole
Current circuit can realize the isolation drive demand of a variety of circuits, and drive waveforms are easy to Synchronization Control, line construction simple and stable.
Specifically, the utility model provides a kind of circuit of synchronous rectification, including：Pwm control circuit, driving expand stream electricity
Road, isolation synchronous circuit, power driving circuit and synchronous rectification filter circuit.
The pwm control circuit, it is described driving expand current circuit, it is described isolation synchronous circuit, the power driving circuit and
The synchronous rectification filter circuit is electrically connected with successively.
The pwm control circuit, two reverse PWM square wave driving signals for being no more than 50% for producing dutycycle.
Current circuit is expanded in the driving, for described two reversely PWM square wave driving signals to be carried out into expansion stream.
The isolation synchronous circuit, for the six road isolation and amplifiers of square wave driving signal point after flowing will to be expanded.
The power driving circuit, for by described in 2 road pulse signal drivens of the isolation synchronous circuit output
Power tube in power driving circuit makes the main power transformer in the power driving circuit carry out pulse power transmission.
The synchronous rectification filter circuit, for the 4 road pulse signal drivens for exporting the isolation synchronous circuit
Two pairs of rectifying tubes in the synchronous rectification filter circuit are realized just for two electric capacity charging of the synchronous rectification filter circuit
Negative dc voltage exports.
As the further improvement of above-mentioned technical proposal, the pwm control circuit includes：IC chip, resistance and
Capacity cell, the resistance and the electric capacity are electrically connected with the IC chip.
As the further improvement of above-mentioned technical proposal, the IC chip selects LM5033.
As the further improvement of above-mentioned technical proposal, current circuit is expanded in the driving to be included：Four resistance, four triodes
With four diodes；1 diode is connected between the emitter and collector of wherein each triode, each two triode
Emitter stage is connected with emitter stage, and base stage is connected with base stage forms a pair of triodes, and 4 triodes form 2 pairs of triodes；4 electricity
Resistance two bleeder circuits of composition provide base current for 2 pairs of triodes.
As the further improvement of above-mentioned technical proposal, every a pair of triodes that the driving is expanded in current circuit are one
NPN type triode and a PNP type triode.
As the further improvement of above-mentioned technical proposal, the isolation synchronous circuit includes：Transformation with 7 windings
Device, 18 resistance, 12 diodes, six triodes；It is defeated that every 3 resistance, 1 triode and 2 diodes form 1 road
Out branch, 18 resistance, 6 triodes and 12 diodes form 6 tunnels output branch road altogether, and 6 output branch roads connect respectively
Second winding of transformer is to the 7th winding；The output end of current circuit is expanded in the first winding connection driving of transformer.
As the further improvement of above-mentioned technical proposal, the first winding to the tertiary winding of the transformer is high voltage winding
Group；The 4th winding to the 7th winding of the transformer is low pressure winding.
As the further improvement of above-mentioned technical proposal, the number of turn all same of all windings of the transformer.
As the further improvement of above-mentioned technical proposal, the source electrode of one of power tube and the drain electrode of another power tube
Connection, a Motor Winding Same Name of Ends of the main power transformer connect the common port of two power tubes, the main power transformer
Another winding connects the synchronous rectification filter circuit.
As the further improvement of above-mentioned technical proposal, the synchronous rectification filter circuit includes：Four rectifying tubes and two
Individual electric capacity；The source electrode of one of rectifying tube and the drain electrode of another rectifying tube connect and compose a pair of rectifying tubes, 4 rectifying tube structures
Into 2 pairs of rectifying tubes, each pair rectifying tube connects the both ends of outside output respectively, is parallel with respectively between the both ends and ground of outside output
Electric capacity.
Using technical scheme provided by the utility model, compared with existing known technology, at least have following beneficial to effect
Fruit：The isolation drive demand of a variety of circuits is realized, drive waveforms are easy to Synchronization Control, line construction simple and stable, had positive and negative
Dual power supply output function, it is adapted to supply electricity to require higher audio-frequency power amplifier.
Brief description of the drawings
, below will be to required use in embodiment in order to illustrate more clearly of the technical scheme of the utility model embodiment
Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 is the structural representation for the circuit of synchronous rectification that the embodiment of the utility model one proposes.
Fig. 2 is the circuit theory diagrams for the circuit of synchronous rectification that the embodiment of the utility model one proposes.
Main element symbol description：
1-PWM control circuits；Current circuit is expanded in 2- drivings；3- isolates synchronous circuit；4- power driving circuits；5- synchronous rectifications
Filter circuit.
Embodiment
Hereinafter, the various embodiments of the disclosure will be described more fully.The disclosure can have various embodiments, and
It can adjust and change wherein.It should be understood, however, that：It is limited to specific reality disclosed herein in the absence of by disclosure protection domain
The intention of example is applied, but the disclosure should be interpreted as covering all in the spirit and scope for the various embodiments for falling into the disclosure
Adjustment, equivalent and/or alternative.
The term used in the various embodiments of the disclosure is only used for describing the purpose of specific embodiment and not anticipated
In the various embodiments of the limitation disclosure.Unless otherwise defined, be otherwise used herein all terms (including technical term and
Scientific terminology) there is the implication identical being generally understood that with the various embodiment one skilled in the art of the disclosure to contain
Justice.The term (term such as limited in the dictionary typically used) be to be interpreted as have with correlative technology field
Situational meaning identical implication and the implication with Utopian implication or overly formal will be not construed as, unless at this
It is clearly defined in disclosed various embodiments.
Embodiment 1
As shown in figure 1, the utility model provides a kind of circuit of synchronous rectification, including：Stream is expanded in pwm control circuit 1, driving
Circuit 2, isolation synchronous circuit 3, power driving circuit 4, synchronous rectification filter circuit 5.
Pwm control circuit 1 is used to produce two reverse PWM square wave driving signals that dutycycle is no more than 50%；Driving is expanded
Current circuit 2 is used to two reverse PWM square wave driving signals carrying out expansion stream；Isolate synchronous circuit 3 to be used to that the square wave after flowing will to be expanded
Six road isolation and amplifiers of drive signal point are gone forward side by side, and horizontal high voltage half-bridge is two-tube and four the synchronous of low-voltage rectifier tube drive；Power drive electricity
Power switch pipe in the 2 road pulse signal driven power driving circuits 4 that road 4 is used to export isolation synchronous circuit 3 makes
Main power transformer in power driving circuit 4 carries out pulse power transmission；Synchronous rectification filter circuit 5 is used to isolate synchronously
The 4 road pulse signal drivens two that circuit 3 exports are that positive and negative direct voltage output is realized in two electric capacity chargings to rectifying tube.
As shown in Fig. 2 pwm control circuit 1 includes：IC chip U1 and related peripheral resistance and capacity cell.
IC chip U1 selects LM5033, and the LM5033 integrated chips have 10 pins, the necessary member of peripheral circuit
Part has electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R5, resistance R6 and resistance R7；Electric capacity C1's
One end connection U1 the 4th pin (+Vcc ends), electric capacity C1 another termination hot high pressure；Electric capacity C2 one end connection U1 the 1st pin
(+Vs ends), electric capacity C2 other end connection high pressure is thermally；Electric capacity C3 one end connection U1 the 2nd pin, the electric capacity C3 other end connect
Connect high pressure thermally；Electric capacity C4 one end connection U1 the 3rd pin, electric capacity C4 other end connection high pressure is thermally；Electric capacity C5 one end
U1 the 10th pin (SS ends) is connected, electric capacity C5 other end connection high pressure is thermally；Electric capacity C6 one end connection U1 the 8th pin, electricity
Hold C6 other end connection high pressure thermally；Resistance R5 one end connection U1 the 9th pin, resistance R5 other end connection hot high pressure
Ground, resistance R6 one end connection U1 the 8th pin, resistance R6 other end connection high pressure is thermally；Resistance R7 one end connection U1's
8th pin, resistance R7 the other end connection power driving circuit 4 in resistance R18 upper end (over-current detection signal end), U1 the 5th,
6 pin are waveform output end, and resistance R1 and resistance R4 in current circuit 2 is expanded in connection driving respectively.
Current circuit 2 is expanded in driving to be included：Four resistance, four triodes and four diodes；The hair of wherein each triode
1 diode is connected between emitter-base bandgap grading and colelctor electrode, the emitter stage of each two triode is connected with emitter stage, base stage and base stage phase
A pair of triodes are even formed, 4 triodes form 2 pairs of triodes；It is that 2 pairs of triodes carry that 4 resistance, which form two bleeder circuits,
For base current.
Specifically, in the present embodiment, driving is expanded current circuit 2 and included：Resistance R1, resistance R2, resistance R3, resistance R4, three
Pole pipe T1, triode T2, triode T3, triode T4, diode D7, diode D9, diode D10, diode D12 and electric capacity
C7；Triode T1 and T3 are NPN type triode, and triode T2 and T4 are PNP type triode.Resistance R1 one end connection
U1 the 5th pin in pwm control circuit 1, the resistance R1 other end connect resistance R2, triode T1 base stage and triode respectively
T2 base stage；Resistance R2 other end connection high pressure is thermally；U1 the 6th pin in resistance R4 one end connection pwm control circuit 1,
The resistance R4 other end connects resistance R3, triode T3 base stage and the T4 of triode base stage respectively；The resistance R3 other end
Connect high pressure thermally；Transformer in triode T1 emitter stage difference connecting triode T2 emitter stage and isolation synchronous circuit 3
Winding TR1A Same Name of Ends ,+Vcc the ends of triode T1 colelctor electrode connection power supply, triode T2 colelctor electrode connects hot high pressure
Ground, diode D7 negative electrode is connected in parallel on triode T1 colelctor electrode, anode is connected in parallel on triode T1 emitter stage, diode D9's
Anode is connected in parallel on triode T2 colelctor electrode, negative electrode is connected in parallel on triode T2 emitter stage；Triode T3 emitter stage connects respectively
Triode T4 emitter stage and electric capacity C7 one end are connect, the winding TR1A's of electric capacity C7 other end connection transformer is non-of the same name
The end ,+Vcc ends of triode T3 colelctor electrode connection power supply, triode T4 colelctor electrode connect high pressure thermally, diode D10 the moon
Pole is connected in parallel on triode T3 colelctor electrode, anode is connected in parallel on triode T3 emitter stage, and diode D12 anode is connected in parallel on three poles
Pipe T4 colelctor electrode, negative electrode are connected in parallel on triode T4 emitter stage.
Isolation synchronous circuit 3 includes：Transformer with 7 windings, 18 resistance, 12 diodes, six three
Pole pipe；Every 3 resistance, 1 triode and 2 diodes form 1 tunnel output branch road, 18 resistance, 6 triodes and 12 two
Pole pipe forms 6 tunnels output branch road altogether, and 6 output branch roads connect the second winding to the 7th winding of transformer respectively；Transformer
The first winding connection driving expand current circuit 2 output end.
Specifically, in the present embodiment, isolation synchronous circuit 3 includes：With 7 windings (winding TR1A, winding TR1B,
Winding TR1C, winding TR1D, TR1E, winding TR1F, winding TR1G) transformer, resistance R8, resistance R10, resistance R19, resistance
R20, resistance R21, resistance R22, resistance R16, resistance R9, resistance R17, resistance R11, resistance R23, resistance R12, resistance R24, electricity
Hinder R13, resistance R25, resistance R14, resistance R26, resistance R15, diode D1, diode D2, diode D3, diode D4, two
Pole pipe D5, diode D6, diode D8, diode D11, diode D13, diode D14, diode D15, diode D16, three
Pole pipe T5, triode T6, triode T9, triode T10, triode T11 and triode T12；The winding TR1A connections of transformer
The output end of current circuit 2 is expanded in driving.
The winding TR1B Same Name of Ends connection resistance R8 of transformer, the resistance R8 other end connect diode D1 anode respectively
With resistance R16, resistance R16 other end connecting triode T5 base stage, diode D1 negative electrode distinguishes connecting triode T5's
Power tube T7 grid in emitter stage and power driving circuit 4, triode T5 colelctor electrode are sequentially connected in series resistance R9 and diode
D8 anode, diode D8 negative electrode connect power in the winding TR1B non-same polarities and power driving circuit 4 of transformer respectively
Pipe T7 source electrode.
The winding TR1C non-same polarities connection resistance R10 of transformer, the resistance R10 other end connect diode D2's respectively
Anode and resistance R17, resistance R17 other end connecting triode T6 base stage, diode D2 negative electrode difference connecting triode
Power tube T8 grid, triode T6 colelctor electrode are sequentially connected in series resistance R11 and two in T6 emitter stage and power driving circuit 4
Pole pipe D11 anode, diode D11 negative electrode connect in the winding TR1C Same Name of Ends and power driving circuit 4 of transformer respectively
Power tube T8 source electrode.
The winding TR1G non-same polarities connection resistance R19 of transformer, the resistance R19 other end connect diode D3's respectively
Anode and resistance R23, resistance R23 other end connecting triode T9 base stage, diode D3 negative electrode difference connecting triode
Rectifying tube T13 grid, triode T9 colelctor electrode are sequentially connected in series resistance in T9 emitter stage and synchronous rectification filter circuit 5
R12 and diode D13 anode, diode D13 negative electrode connect winding TR1G Same Name of Ends and the synchronous rectification of transformer respectively
Rectifying tube T13 source electrode in filter circuit 5.
The winding TR1E Same Name of Ends connection resistance R20 of transformer, the resistance R20 other end connect diode D4 sun respectively
Pole and resistance R24, resistance R24 other end connecting triode T10 base stage, diode D4 negative electrode difference connecting triode
Rectifying tube T14 grid, triode T10 colelctor electrode are sequentially connected in series resistance in T10 emitter stage and synchronous rectification filter circuit 5
R13 and diode D14 anode, diode D14 negative electrode connect the winding TR1E non-same polarities of transformer and synchronous whole respectively
Flow the source electrode of rectifying tube T14 in filter circuit 5.
The winding TR1F Same Name of Ends connection resistance R21 of transformer, the resistance R21 other end connect diode D5 sun respectively
Pole and resistance R25, resistance R25 other end connecting triode T11 base stage, diode D5 negative electrode difference connecting triode
Rectifying tube T15 grid, triode T11 colelctor electrode are sequentially connected in series resistance in T11 emitter stage and synchronous rectification filter circuit 5
R14 and diode D15 anode, diode D15 negative electrode connect the winding TR1F non-same polarities of transformer and synchronous whole respectively
Flow the source electrode of rectifying tube T15 in filter circuit 5.
The winding TR1D non-same polarities connection resistance R22 of transformer, the resistance R22 other end connect diode D6's respectively
Anode and resistance R26, resistance R26 other end connecting triode T12 base stage, diode D6 negative electrode difference connecting triode
Rectifying tube T16 grid, triode T12 colelctor electrode are sequentially connected in series resistance in T12 emitter stage and synchronous rectification filter circuit 5
R15 and diode D16 anode, diode D16 negative electrode connect winding TR1D Same Name of Ends and the synchronous rectification of transformer respectively
Rectifying tube T16 source electrode in filter circuit 5.
Transformer with 7 windings is isolation voltage device.Winding TR1A, winding TR1B, winding TR1C are high voltage winding
Group；Winding TR1D, winding TR1E, winding TR1F, winding TR1G are low pressure winding.Winding TR1A, winding TR1B, winding
TR1C, winding TR1D, winding TR1E, winding TR1F, winding TR1G number of turn all same.
Power driving circuit 4 includes：Two power tubes, the main power transformer with 2 windings；One of power tube
Source electrode connected with the drain electrode of another power tube, a Motor Winding Same Name of Ends of the main power transformer connects two power tubes
Common port, another winding connection synchronous rectification filter circuit 5 of the main power transformer.
Specifically, in the present embodiment, power driving circuit 4 includes：Electric capacity C8, electric capacity C9, electric capacity C10, power tube T7,
Power tube T8, resistance R18, the main power transformer with 2 windings (winding TR2A and winding TR2B)；Electric capacity C8 goes for power supply
Coupling electric capacity, electric capacity C9 is equal with electric capacity C10 capacity, is serially connected in+HVin and hot high pressure earth-return, and series connection common port connects main power
The winding TR2A of transformer the non-same polarity ,+HVin of power tube T7 drain electrode connection power supply, power tube T7 source electrode connect respectively
Power tube T8 drain electrode and the winding TR2A Same Name of Ends of main power transformer are connect, power tube T8 source electrode connects resistance R18 respectively
With resistance R7 in pwm control circuit 1, resistance R18 the other end connection high pressure thermally, power tube T7 and power tube T8 grid and
Output end of the source electrode respectively with isolation synchronous circuit 3 connects, and the winding TR2B of main power transformer exports 3 ends and connects synchronization respectively
The common port of the common port of rectifying tube T13 and rectifying tube T14 in rectification and filter circuit 5, rectifying tube T15 and rectifying tube T16
And electric capacity C11 and electric capacity C12 common port.
Synchronous rectification filter circuit 5 includes：Four rectifying tubes and two electric capacity；The source electrode of one of rectifying tube and another
The drain electrode of individual rectifying tube connects and composes a pair of rectifying tubes, and 4 rectifying tubes form 2 pairs of rectifying tubes, and each pair rectifying tube connects outer respectively
The both ends of portion's output, electric capacity is parallel with respectively between the both ends and ground of outside output.
Specifically, in the present embodiment, synchronous rectification filter circuit 5 includes：Rectifying tube T13, rectifying tube T14, rectifying tube
T15, rectifying tube T16, electric capacity C11, electric capacity C12；Rectifying tube T13 drain electrode and rectifying tube T15 drain electrode are all connected with electric capacity C11's
Positive pole, rectifying tube T14 source electrode and rectifying tube T16 source electrode are all connected with electric capacity C12 negative pole, rectifying tube T13 source electrode and whole
The winding TR2B non-same polarities of main power transformer, rectifying tube T15 source in flow tube T14 drain electrode connection power driving circuit 4
The winding TR2B Same Name of Ends of main power transformer in pole and rectifying tube T16 drain electrode connection power driving circuit 4, rectifying tube T13,
Rectifying tube T14, rectifying tube T15, rectifying tube T16 grid connect with output end of the source electrode respectively with isolation synchronous circuit 3.
Square-wave waveform dead time is relevant with frequency caused by pwm control circuit 1.
Isolate synchronous circuit 3 in transformer can 7 the same windings form by meeting the number of turn of safety insulation request.Institute
There is driving network to meet certain phase condition to each winding of transformer.
As shown in Fig. 2 the core of pwm control circuit 1 is integrated chip U1, it is anti-to produce two of dutycycle no more than 50%
Phase PWM square wave driving signals, exported through OUT1 (the 5th pin), OUT2 (the 6th pin) port, peripheral cell has：C1 is feeder ear
(Vcc) decoupling capacitor, C2 are to start control terminal (Vin) decoupling capacitor, and voltage end (REF) decoupling capacitor on the basis of C3, C4 is work
Make state and end (COMP) decoupling capacitor is set, C5 is soft start end (SS) decoupling capacitor, and R5 is that switching frequency sets end (RT) electricity
Hinder, the over-current signal that the resistance R18 in power driving circuit 4 is detected delivers to U1 through resistance R7 and R6 decay, electric capacity C6 decouplings
Over-current detection end (CS).
The effect that current circuit 2 is expanded in driving is to expand the PWM square wave driving signals exported in pwm control circuit 1 to flow, work side
Formula：Drive signal is through resistance R1 and resistance R4 current limlitings, through triode T1, T2 and triode T10, triode T12 Current amplifiers again
The winding TR1A of transformer in output to isolation synchronous circuit 3 both ends, resistance R2 and resistance R3 prevent triode from malfunctioning,
Diode D7, diode D12 and diode D9, diode D10 are respectively that Transformer Winding TR1A is provided in drive signal dead band
Bleed-off circuit is vibrated, prevents triode from puncturing.
The effect of isolation synchronous circuit 3 is by the driving pulse 6 road isolation and amplifiers of square wave point of transformer inputs and carried out
High voltage half-bridge is two-tube and the synchronous driving of 4 rectifying tubes of low pressure, during driving transformer winding TR1A input pulse drive signals its
Remaining winding TR1B, TR1C, TR1D, TR1E, TR1F, TR1G can produce the synchronous driving pulse of isolation.
When the input of driving transformer winding TR1A Same Name of Ends is positive pulse drive signal, winding TR1B Same Name of Ends produces just
Phase pulse ends switch transistor T 8 through resistance R8, diode D1, switch transistor T 7, winding TR1C non-same polarities generation rp pulse；
Winding TR1E, winding TR1F Same Name of Ends produce positive pulse respectively through resistance R20, diode D4 and resistance R21, diode D5,
Rectifying tube T14, rectifying tube T15, winding TR1D, winding TR1G non-same polarities generation rp pulse can make rectifying tube T16, rectifying tube
T13 ends.
When drive signal enters dead band interval, winding TR1B connection resistance R8, resistance R16, triode T5, resistance R9 and
Diode D8, the remnant drive voltage of switch tube T7 grids, which carries out absorption, makes it quickly end；Winding TR1E connects resistance
R20, resistance R24, triode T10, resistance R13 and diode D14, the remnant drive voltage of switch tube T14 grids are carried out
Absorption makes it quickly end；Winding TR1F connection resistance R21, resistance R25, triode T11, resistance R14 and diode D15,
The remnant drive voltage of switch tube T15 grids, which carries out absorption, makes it quickly end；If to winding in this absorption process
TR1A generates larger resonance potential and the+Vcc of power supply will released by diode D7, diode D12.
When the input of driving transformer winding TR1A Same Name of Ends is rp pulse drive signal, winding TR1C Same Name of Ends produces just
Phase pulse ends switch transistor T 7 through resistance R10, diode D2, switch transistor T 8, winding TR1B non-same polarities generation rp pulse；
Winding TR1G, winding TR1D Same Name of Ends produce positive pulse respectively through resistance R19, diode D3 and resistance R22, diode D6,
Rectifying tube T13, rectifying tube T16, winding TR1E, winding TR1F non-same polarities, which produce rp pulse, can make T14, T15 sections of rectifying tube
Only.
When drive signal enters next dead band interval, winding TR1C connection resistance R10, resistance R17, triode T6, electricity
R11 and diode D11 is hindered, the remnant drive voltage of switch tube T8 grids, which carries out absorption, makes it quickly end；Winding TR1G
Connect resistance R19, resistance R23, triode T9, resistance R12 and diode D13, the remnant drive electricity of switch tube T13 grids
Pressure, which carries out absorption, makes it quickly end；Winding TR1D connection resistance R22, resistance R26, triode T12, resistance R15 and two poles
Pipe D16, the remnant drive voltage of switch tube T16 grids, which carries out absorption, makes it quickly end；It is if right in this absorption process
Winding TR1A generates larger resonance potential and the+Vcc of power supply will released by diode D9, diode D10.
The effect of power driving circuit 4 is the pulse signal driven power switch pipe for exporting isolation synchronous circuit 3
Main power transformer is allowed to carry out pulse power transmission；When power tube T7 conductings, power tube T8 cut-offs, power transformer winding TR2A
Same Name of Ends access+HVin, non-same polarity connection electric capacity C9, electric capacity C10 common ports form driving circuit, the production of winding TR2B Same Name of Ends
Raw positive pulse；When power tube T8 conductings, power tube T7 cut-offs, power transformer winding TR2A Same Name of Ends is accessed by power tube T8
Thermally, electric capacity C9, C10 common port are connected with non-same polarity and forms driving circuit, winding TR2B non-same polarities produce positive pulse.
The effect of synchronous rectification filter circuit 5 is the synchronization pulse driven two for exporting isolation synchronous circuit 3
It is that " +/- " direct voltage outputs are realized in the charging of two electric capacity to rectifying tube, when rectifying tube T14 and rectifying tube T15 are both turned on, power
Transformer Winding TR2B Same Name of Ends positive pulses are charged through T15 rectifications to electric capacity C11, and non-same polarity rp pulse is through T14 rectifications
Charged to electric capacity C12.When rectifying tube T13 and rectifying tube T16 are both turned on, power transformer winding TR2B Same Name of Ends rp pulse passes through
T16 rectifications are charged to electric capacity C12, and the pulse of non-same polarity positive is charged through T13 rectifications to electric capacity C11.Such loop cycle ,+
Vout and-Vout ends obtain direct current output.
The course of work of pulse square wave a cycle in circuit：When pwm pulse square wave caused by U1 is the 5th pin high level 6
During pin low level, pulse expands resistance R1, triode T1, electric capacity C7, triode T4, resistance R4 and winding in current circuit 2 through driving
TR1A Current amplifiers, now winding TR1A Same Name of Ends is positive pulse drive signal, winding TR1B, winding TR1E, winding TR1F
Same Name of Ends produces the positive pulse drive signal of isolation simultaneously, and winding TR1B Same Name of Ends produces positive pulse through resistance R8 diodes
D1 driving switch pipe T7, winding TR1E Same Name of Ends produce positive pulse through resistance R20 diode D4 driving switch pipe T14, winding
TR1F Same Name of Ends produces switch transistor T 15 during positive pulse drives through resistance R21 diodes D5；Switch transistor T 7 is opened winding TR2A
+ the HVin that Same Name of Ends switches on power, winding TR2A non-same polarity connection electric capacity C9, electric capacity C10 common ports form positive pulse and driven
Dynamic loop, winding TR2B Same Name of Ends produce positive pulse voltage；Switch transistor T 15 is by winding TR2B Same Name of Ends positive pulses to electric capacity
C11 charges, and switch transistor T 14 charges winding TR2B non-same polarities rp pulse to electric capacity C12.When pwm pulse side caused by U1
When ripple is 5 pin low level of the 6th pin high level, pulse is through resistance R4, triode T3, electric capacity C7, triode T2, resistance R1 and winding
TR1A Current amplifiers, now winding TR1A Same Name of Ends is rp pulse drive signal, winding TR1C, winding TR1G, winding TR1D
Same Name of Ends produces the anti-phase driving pulse of synchronization of isolation, switch transistor T 8 and switch transistor T 13, switch transistor T 16 while open-minded, transformer
The connection of winding TR2A Same Name of Ends is thermally, non-same polarity connects electric capacity C9, electric capacity C10 common ports form rp pulse driving circuit,
Rp pulse voltage caused by winding TR2B is that electric capacity C11 and electric capacity C12 charges through switch transistor T 13, switch transistor T 16.
It will be appreciated by those skilled in the art that accompanying drawing is a schematic diagram for being preferable to carry out scene, module in accompanying drawing or
Flow is not necessarily implemented necessary to the utility model.
It will be appreciated by those skilled in the art that the module in device in implement scene can be described according to implement scene into
Row is distributed in the device of implement scene, can also carry out one or more dresses that respective change is disposed other than this implement scene
In putting.The module of above-mentioned implement scene can be merged into a module, can also be further split into multiple submodule.
Above-mentioned the utility model sequence number is for illustration only, does not represent the quality of implement scene.Disclosed above is only this
Several specific implementation scenes of utility model, still, the utility model is not limited to this, any those skilled in the art's energy
Think of change should all fall into the scope of protection of the utility model.
Claims (10)
- A kind of 1. circuit of synchronous rectification, it is characterised in that including：Pwm control circuit, driving expand current circuit, isolation synchronous circuit, Power driving circuit and synchronous rectification filter circuit；The pwm control circuit, the driving expand current circuit, the isolation synchronously Circuit, the power driving circuit and the synchronous rectification filter circuit are electrically connected with successively；The pwm control circuit, two reverse PWM square wave driving signals for being no more than 50% for producing dutycycle；Current circuit is expanded in the driving, for described two reversely PWM square wave driving signals to be carried out into expansion stream；The isolation synchronous circuit, for the six road isolation and amplifiers of square wave driving signal point after flowing will to be expanded；The power driving circuit, for by it is described isolation synchronous circuit output 2 road pulse signal drivens described in power Power tube in drive circuit makes the main power transformer in the power driving circuit carry out pulse power transmission；The synchronous rectification filter circuit, for by described in 4 road pulse signal drivens of the isolation synchronous circuit output Two pairs of rectifying tubes in synchronous rectification filter circuit are realized positive and negative straight for two electric capacity charging of the synchronous rectification filter circuit Flow voltage output.
- 2. circuit of synchronous rectification according to claim 1, it is characterised in that the pwm control circuit includes：Integrated circuit Chip, resistance and capacity cell, the resistance and the electric capacity are electrically connected with the IC chip.
- 3. circuit of synchronous rectification according to claim 2, it is characterised in that the IC chip selects LM5033.
- 4. circuit of synchronous rectification according to claim 1, it is characterised in that current circuit is expanded in the driving to be included：Four electricity Resistance, four triodes and four diodes；1 diode is connected between the emitter and collector of wherein each triode, The emitter stage of each two triode is connected with emitter stage, and base stage is connected with base stage forms a pair of triodes, and 4 triodes form 2 To triode；4 resistance form two bleeder circuits and provide base current for 2 pairs of triodes.
- 5. circuit of synchronous rectification according to claim 4, it is characterised in that every a pair three in the driving expansion current circuit Pole pipe is a NPN type triode and a PNP type triode.
- 6. circuit of synchronous rectification according to claim 1, it is characterised in that the isolation synchronous circuit includes：With 7 The transformer of winding, 18 resistance, 12 diodes, six triodes；Every 3 resistance, 1 triode and 2 two poles Pipe forms 1 tunnel output branch road, and 18 resistance, 6 triodes and 12 diodes form 6 tunnels output branch road, 6 output branch altogether Road connects the second winding to the 7th winding of transformer respectively；The defeated of current circuit is expanded in the first winding connection driving of transformer Go out end.
- 7. circuit of synchronous rectification according to claim 6, it is characterised in that the first winding of the transformer to the 3rd around Group is high pressure winding；The 4th winding to the 7th winding of the transformer is low pressure winding.
- 8. circuit of synchronous rectification according to claim 6, it is characterised in that the number of turn of all windings of the transformer is equal It is identical.
- 9. circuit of synchronous rectification according to claim 1, it is characterised in that the source electrode of one of power tube and another The drain electrode connection of power tube, a Motor Winding Same Name of Ends of the main power transformer connect the common port of two power tubes, the master Another winding of power transformer connects the synchronous rectification filter circuit.
- 10. circuit of synchronous rectification according to claim 1, it is characterised in that the synchronous rectification filter circuit includes：Four Individual rectifying tube and two electric capacity；The source electrode of one of rectifying tube and the drain electrode of another rectifying tube connect and compose a pair of rectifications Pipe, 4 rectifying tubes form 2 pairs of rectifying tubes, and each pair rectifying tube connects the both ends of outside output, both ends and the ground of outside output respectively Between be parallel with electric capacity respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721196588.8U CN207200596U (en) | 2017-09-15 | 2017-09-15 | Circuit of synchronous rectification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721196588.8U CN207200596U (en) | 2017-09-15 | 2017-09-15 | Circuit of synchronous rectification |
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| CN207200596U true CN207200596U (en) | 2018-04-06 |
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| CN201721196588.8U Expired - Fee Related CN207200596U (en) | 2017-09-15 | 2017-09-15 | Circuit of synchronous rectification |
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| CN (1) | CN207200596U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739859A (en) * | 2019-11-28 | 2020-01-31 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | symmetrical half-bridge resonant open-loop DC proportional converter |
| CN110868078A (en) * | 2019-11-28 | 2020-03-06 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | LCT integrated magnetic element of sine power converter |
| CN111181422A (en) * | 2020-02-26 | 2020-05-19 | 福建捷联电子有限公司 | Circuit for improving reliability of Flyback synchronous rectification control circuit |
| CN112039342A (en) * | 2019-11-13 | 2020-12-04 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Drive circuit of symmetrical half-bridge resonance open-loop direct current proportional converter |
| CN112039341A (en) * | 2019-11-13 | 2020-12-04 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit |
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2017
- 2017-09-15 CN CN201721196588.8U patent/CN207200596U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039342A (en) * | 2019-11-13 | 2020-12-04 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Drive circuit of symmetrical half-bridge resonance open-loop direct current proportional converter |
| CN112039341A (en) * | 2019-11-13 | 2020-12-04 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit |
| CN112039341B (en) * | 2019-11-13 | 2021-12-31 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Driving method of symmetrical half-bridge LC series resonance sine power conversion circuit |
| CN110739859A (en) * | 2019-11-28 | 2020-01-31 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | symmetrical half-bridge resonant open-loop DC proportional converter |
| CN110868078A (en) * | 2019-11-28 | 2020-03-06 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | LCT integrated magnetic element of sine power converter |
| CN110739859B (en) * | 2019-11-28 | 2021-11-30 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Symmetrical half-bridge resonance open-loop direct-current proportional converter |
| CN110868078B (en) * | 2019-11-28 | 2021-11-30 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | Symmetrical half-bridge LC series resonance sine power conversion circuit |
| CN111181422A (en) * | 2020-02-26 | 2020-05-19 | 福建捷联电子有限公司 | Circuit for improving reliability of Flyback synchronous rectification control circuit |
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