CN102255287B - A kind of prevent the anti-circuit filling electric current - Google Patents
A kind of prevent the anti-circuit filling electric current Download PDFInfo
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- CN102255287B CN102255287B CN201110210247.2A CN201110210247A CN102255287B CN 102255287 B CN102255287 B CN 102255287B CN 201110210247 A CN201110210247 A CN 201110210247A CN 102255287 B CN102255287 B CN 102255287B
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Abstract
The invention discloses and a kind of prevent the anti-circuit filling electric current, including logic conversion circuit with switch off control circuit；Logic conversion circuit receives the first switching tube, second switch pipe, the 3rd switching tube and the driving signal of the 4th switching tube in full-bridge circuit, carries out logistic transformation according to the driving signal of four switching tubes and produces the first signal source and secondary signal source；Switch off control circuit and include reference voltage generating circuit, charge-discharge circuit, the first comparator, the second comparator, the first diode and the second diode；Logic conversion circuit logistic transformation produces the first signal source and secondary signal source, and then access switches off control circuit.The present invention prevents the anti-circuit filling electric current, when bridge synchronization rectification circuit occurs anti-filling electric current, switch off control circuit and can cause action, and then turn off the upper synchronous rectifier in circuit of synchronous rectification and lower synchronous rectifier in time, avoid the anti-impact filling electric current in time.
Description
Technical field
The present invention relates to bridge synchronization rectification circuit, particularly relate to bridge synchronization rectification circuit prevents the anti-electric current that fills
Circuit.
Background technology
Bridge synchronization rectification circuit is common circuit topology, as it is shown in figure 1, bridge synchronization rectification circuit includes full-bridge electricity
Road 1, transformator and circuit of synchronous rectification 2.Full-bridge circuit 1 includes being formed by connecting by the first switching tube Q1 and second switch pipe Q2
First brachium pontis, the 3rd switching tube Q3 and the 4th switching tube Q4 the second brachium pontis being formed by connecting.Circuit of synchronous rectification 2 is by upper synchronization
Rectifier tube Q5, lower synchronous rectifier Q6 and inductance L are formed by connecting.Full-bridge circuit 1 and circuit of synchronous rectification 2 are by a transformation
Device connects: transformator includes primary coil T-C, the first secondary coil T-A and the second secondary coil T-B, and primary coil T-C connects
Between the midpoint of the midpoint of the first brachium pontis and the second brachium pontis, first secondary coil T-A the first end and the second secondary coil T-B
One end is connected, and the end that is connected connects first end of inductance L, first secondary coil T-A the second end and the first of upper synchronous rectifier Q5
End is connected, and second secondary coil T-B the second end is connected with first end of lower synchronous rectifier Q6.The second of upper synchronous rectifier Q5
Hold ground connection after being connected with second end of lower synchronous rectifier Q6.
During work, when the four driving signal D of the driving signal A and the 4th switching tube Q4 of the first switching tube Q1 are low electricity simultaneously
At ordinary times, the driving signal E of upper synchronous rectifier Q5 is low level；Driving signal B and the 3rd switching tube as second switch pipe Q2
When the driving signal C of Q3 is low level simultaneously, the driving signal F of lower synchronous rectifier Q6 is low level.And when upper synchronous rectification
The driving signal F of the driving signal E and lower synchronous rectifier Q6 of pipe Q5 occurs one high and one low, upper synchronous rectifier Q5 and lower synchronization
Have a rectifier tube conducting in rectifier tube Q6, then circuit of synchronous rectification 2 works in rectification state, the electric current line that inductance L flows through
Property increase；And when the driving signal F of the driving signal E and lower synchronous rectifier Q6 of upper synchronous rectifier Q5 is high level simultaneously,
Upper synchronous rectifier Q5 and lower synchronous rectifier Q6 simultaneously turns on, then circuit of synchronous rectification 2 works in freewheeling state, on inductance L
The electric current flow through linearly reduces.And when inductive current is decreased to zero, if the output end voltage Vout of now circuit of synchronous rectification
Less than and machine another bridge synchronization rectification circuit of connecting in the output end voltage of circuit of synchronous rectification time, then and machine connects
The output end voltage of another circuit of synchronous rectification can counter fill to this circuit of synchronous rectification 2, i.e. can produce in circuit of synchronous rectification 2
The raw anti-electric current that fills, and then affect the work in front end full-bridge circuit 1.
For preventing from counter filling the electric current impact on circuit, it will usually increase in bridge synchronization rectification circuit and prevent from counter filling electric current
Circuit, as it is shown in figure 1, often increase sampling resistor RS as preventing the anti-circuit 3 filling electric current, sampling resistor RS one end with upper with
The end that is connected of step rectifier tube Q5 and lower synchronous rectifier Q6 is connected, other end ground connection.Played by sampling resistor RS and prevent anti-filling
The effect of electric current: i.e. when, by detect sampling resistor RS two ends voltage, it is judged that circuit of synchronous rectification whether occur counter fill electricity
Stream, if it is, simultaneously turn off the upper synchronous rectifier Q5 in circuit of synchronous rectification 2 and lower synchronization by corresponding control circuit
Rectifier tube Q6.But, prevent the anti-scheme filling electric current by sampling resistor RS, due to the depositing of inductance L in circuit of synchronous rectification 2
, the electric current on sampling resistor RS can not suddenly change, so even there is the anti-formation filling electric current, the voltage at sampling resistor RS two ends is also
Cannot reflect the anti-generation filling electric current in time, therefore the program can not detect in time and counter fill electric current, the most just cannot be instead
Fill when electric current produces and turn off synchronous rectifier Q5 and lower synchronous rectifier Q6 in time, and then just cannot avoid in time counter filling electric
The impact of stream.
Summary of the invention
The technical problem to be solved is: make up above-mentioned the deficiencies in the prior art, proposes one and prevents from counter filling electricity
The circuit of stream, can turn off synchronous rectifier Q5 and lower synchronous rectifier Q6 in time anti-filling when electric current occurs, avoid anti-in time
Fill the impact of electric current.
The technical problem of the present invention is solved by following technical scheme:
A kind of prevent the anti-circuit filling electric current, in bridge synchronization rectification circuit, described bridge synchronization rectification circuit bag
Include full-bridge circuit, transformator and circuit of synchronous rectification；Described full-bridge circuit includes being connected by the first switching tube and second switch pipe
The first brachium pontis, the 3rd switching tube and the 4th switching tube the second brachium pontis being formed by connecting；Described circuit of synchronous rectification by
Upper synchronous rectifier, lower synchronous rectifier and inductance connection form；Described transformator includes primary coil, the first secondary coil
With the second secondary coil, described primary coil is connected between the midpoint of described first brachium pontis and the midpoint of described second brachium pontis,
First end of described first secondary coil is connected with the first end of described second secondary coil, and the end that is connected connects the of described inductance
One end, the second end of described first secondary coil is connected with the first end of described upper synchronous rectifier, described second secondary coil
Second end of T-B is connected with the first end of described lower synchronous rectifier, and the second end of described upper synchronous rectifier is lower same with described
The connected rear ground connection of second end of step rectifier tube, the outfan that the second end is described circuit of synchronous rectification of described inductance；Described anti-
The most anti-circuit filling electric current includes logic conversion circuit and switches off control circuit；Described logic conversion circuit receives described full-bridge electricity
First switching tube, second switch pipe, the 3rd switching tube and the driving signal of the 4th switching tube in road, according to driving of four switching tubes
Dynamic signal carries out logistic transformation and produces the first signal source and secondary signal source；The logistic transformation relation of described logic conversion circuit
For: when the driving signal driving signal and described 4th switching tube of described first switching tube is low level, or described the
When the driving signal driving signal and described 3rd switching tube of two switching tubes is low level, described first signal source is high electricity
Flat, described secondary signal source is low level；Described switch off control circuit include reference voltage generating circuit, charge-discharge circuit,
One comparator, the second comparator, the first diode and the second diode；Reference voltage generating circuit produces reference voltage；Described
Charge-discharge circuit includes the first resistance, the second resistance, the 3rd resistance and electric capacity, described first resistance, the second resistance and capacitance group
Become charging circuit, described 3rd resistance and electric capacity composition discharge circuit；First end of described first resistance receives described first letter
Number source, the second end of described first resistance is connected the forward of described second comparator with the first end of described second resistance after being connected
Input, the second end of described second resistance connects the first end of described electric capacity, the first end of described 3rd resistance respectively, described
Second end ground connection of electric capacity, the second end of described 3rd resistance connects the outfan of described first comparator, and described first compares
The reverse input end of the positive input of device and described second comparator receives described reference voltage, described first comparator anti-
Receive described secondary signal source to input, the outfan of described second comparator connect respectively the negative electrode of the first diode, the
The negative electrode of two diodes, the anode of described first diode, the anode of the second diode connect described upper synchronous rectifier respectively
Drive signal, the driving signal of described lower synchronous rectifier.
Preferably in technical scheme,
Described switching off control circuit, the parameter of each device meets:, wherein, R1、R2、R3Respectively
Representing the first resistance, the second resistance, the resistance of the 3rd resistance, Vo represents the output end voltage of described circuit of synchronous rectification, Vd table
Show described first secondary coil and the voltage at the end that is connected of described second secondary coil；And described first resistance and the second resistance
Resistance meet: at the end of the electric discharge of described discharge circuit, described first resistance is connected with described second resistance under the voltage at end
It is down to equal to described reference voltage.
The present invention is compared with the prior art and provides the benefit that:
The present invention prevents the anti-circuit filling electric current, by logic conversion circuit receive the first switching tube, second switch pipe,
3rd switching tube and the driving signal of the 4th switching tube, logistic transformation produces the first signal source and secondary signal source, and then accesses
Switch off control circuit.When bridge synchronization rectification circuit occurs anti-fill electric current time, the first switching tube in the full-bridge circuit of front end, second
The driving signal of switching tube, the 3rd switching tube and the 4th switching tube can produce respective change, and then causes the first signal source and
The change in binary signal source, thus cause the action switched off control circuit, and then turn off the upper synchronization in circuit of synchronous rectification in time
Rectifier tube and lower synchronous rectifier, avoid the anti-impact filling electric current in time.
Accompanying drawing explanation
Fig. 1 is the structure chart of bridge synchronization rectification circuit of the prior art；
Fig. 2 is the circuit diagram preventing the anti-circuit filling electric current in this detailed description of the invention；
Fig. 3 is to prevent the instantiation circuit of logic conversion circuit in the anti-circuit filling electric current in this detailed description of the invention
Figure；
Fig. 4 is the circuit diagram that logic conversion circuit shown in Fig. 3 optimizes further.
Detailed description of the invention
Below in conjunction with detailed description of the invention and compare accompanying drawing the present invention is described in further details.
Detailed description of the invention one
This detailed description of the invention prevents the anti-circuit filling electric current, is applied to bridge synchronization rectification circuit as shown in Figure 1
In, turn off the upper synchronous rectification in its circuit of synchronous rectification in time during for anti-filling electric current occurs in bridge synchronization rectification circuit
Pipe Q5 and lower synchronous rectifier Q6.As in figure 2 it is shown, prevent the anti-circuit filling electric current, including logic in this detailed description of the invention
Translation circuit 100 and switch off control circuit 200.
Wherein, logic conversion circuit 100 receive the first switching tube in full-bridge circuit, second switch pipe, the 3rd switching tube and
Driving signal A, B, C and D of 4th switching tube, carries out logistic transformation according to the driving signal of four switching tubes and produces the first signal
Source S1 and secondary signal source S2；The logistic transformation relation of logic conversion circuit is: as the driving signal A and the 4th of the first switching tube
The driving signal D of switching tube is low level, or the driving signal B and the driving signal C of the 3rd switching tube of second switch pipe
When being low level, the first signal source S1 is high level, and secondary signal source S2 is low level.
Switch off control circuit and 200 include reference voltage generating circuit 201, charge-discharge circuit 202, the first comparator U1,
Two comparator U2, the first diode D1 and the second diode D2.Reference voltage generating circuit 201 produces reference voltage V ref, fills
Discharge circuit 202 includes the first resistance R1, the second resistance R2, the 3rd resistance R3 and electric capacity C1, first termination of the first resistance R1
Receiving the first signal source S1, second end of the first resistance R1 and first end of the second resistance R2 connect the second comparator U2's after being connected
Positive input, second end of the second resistance R2 connects first end of electric capacity C1, first end of the 3rd resistance R3, electric capacity C1 respectively
The second end ground connection, second end of the 3rd resistance R3 connects the outfan of the first comparator U1, and the forward of the first comparator U1 is defeated
The reverse input end entering end and the second comparator U2 receives reference voltage V ref, and the reverse input end of the first comparator U1 receives the
Binary signal source S2, the outfan of the second comparator U2 connects the negative electrode of the first diode D1, the negative electrode of the second diode D2 respectively,
The anode of the first diode D1, the anode of the second diode D2 connect the driving of upper synchronous rectifier in circuit of synchronous rectification respectively
Signal E, the driving signal F of lower synchronous rectifier.
Wherein, in this detailed description of the invention, reference voltage generating circuit 201 includes the 4th resistance R4 and the 5th resistance R5, the
First end of four resistance R4 connects first end of second end connection the 5th resistance R5 of external power supply V, the 4th resistance R4, the 5th electricity
The second end ground connection of resistance R5.
During work, when in circuit of synchronous rectification, the driving signal E of upper synchronous rectifier and the driving of lower synchronous rectifier Q6
When signal F occurs one high and one low, circuit of synchronous rectification 2 works in rectification state, and the electric current that inductance L flows through linearly increases.This
Time, namely in the full-bridge circuit of front end, the driving signal A of the first switching tube and the driving signal D of the 4th switching tube is low level,
Or the driving signal C of the driving signal B of second switch pipe and the 3rd switching tube is low level.Therefore, now logistic transformation
Obtaining the first signal source S1 in circuit is high level, and secondary signal source S2 is low level.The most now switch off control circuit in 200,
First comparator U1 is output as high-impedance state, forms " S1 → the first resistance R1 → the second resistance R2 → electricity in charging and discharging circuit
Hold C1 → ground " charge circuit, then the voltage Vg of the first resistance R1 and the second resistance R2 connecting place G point is along with the increasing of inductive current
Increase greatly.
When in circuit of synchronous rectification, the driving signal E and the driving signal F of lower synchronous rectifier Q6 of upper synchronous rectifier Q5
When being high level, circuit of synchronous rectification 2 works in freewheeling state simultaneously, and the electric current that inductance L flows through linearly reduces.Now, also
I.e. in the full-bridge circuit of front end, there is no occur that " the driving signal A of the first switching tube and the driving signal D of the 4th switching tube is low
Level, or the driving signal C of the driving signal B of second switch pipe and the 3rd switching tube is low level " situation.Therefore,
Now obtaining the first signal source S1 in logic conversion circuit is not high level, should be low level, and secondary signal source S2 is not low electricity
Flat, should be high level.In the most now switching off control circuit, the first comparator U1 is output as low resistive state, in charging and discharging circuit
Form the discharge loop on " outfan → ground of electric capacity C1 → the three resistance R3 → the comparator U1 ", make to charge before on electric capacity C1
The tension discharge obtained, the most now the voltage Vh of the second resistance R2 and the 3rd resistance R3 connecting place H is along with the decline of inductive current
And decline, the voltage Vg of the first resistance R1 and the second resistance R2 connecting place G point declines also with the decline of inductive current.
And when switch off control circuit in 200, the parameter of each device meets:Time, wherein, R1、R2、R3
Representing the first resistance, the second resistance, the resistance of the 3rd resistance respectively, Vo represents the output end voltage Vout of circuit of synchronous rectification 2
Value, Vd represent in Fig. 1 in bridge synchronization rectification circuit the first secondary coil with at the end that is connected of described second secondary coil
Voltage.And due toCorresponding with rise time of the electric current of inductance L in circuit of synchronous rectification 2, fall time, then work as pass
When in disconnected control circuit 200, the parameter of each device meets above-mentioned relation, during the charging of the charge-discharge circuit in 200 of switching off control circuit
Between i.e. corresponding with the rise time of inductive current, discharge time is i.e. corresponding with the fall time of inductive current, namely when synchronize whole
When current circuit normally works, when inductive current drops to zero, in charge-discharge circuit 202, electric discharge terminates.And due to charge-discharge circuit
In 202 at the end of discharge circuit electric discharge, the voltage of the first resistance R1 and the second resistance R2 connecting place G point drops to equal to benchmark electricity
Pressure Vref, so can draw, in charge-discharge circuit, the voltage Vg of the first resistance R1 and the second resistance R2 connecting place G point drops to
When reference voltage V ref, in correspondence circuit of synchronous rectification, inductive current drops to zero.
During normal operating conditions, when freewheeling state terminates, and inductive current reduces to zero, the first resistance R1 and the second resistance R2 phase
At Lian, the voltage Vg of G drops to equal to reference voltage V ref, and now the second comparator still exports high-impedance state, will not overturn dynamic
Make.Circuit of synchronous rectification can enter rectification state afterwards, then switch off control circuit the first resistance R1 and the second resistance R2 phase in 200
At Lian, the voltage Vg of G can charge rising, and more than reference voltage V ref, then the second comparator output remains high-impedance state, will not
Rotary movement.Entering freewheeling state afterwards, the voltage Vg of connecting place G can decline with the electric discharge of discharge circuit, until inductance
Electric current reduces to zero, and Vg is equal to reference voltage V ref, and the second comparator exports high-impedance state all the time, all the time will not rotary movement.It
After enter again rectification state, so circulation work is gone down.In sum, during normal operating conditions, switch off control circuit in 200
Two comparator U2 output be always high-impedance state, do not interfere with the first diode D1, second diode D2 anode connect upper with
Step rectifier tube, lower synchronous rectifier drive the change of signal, then do not interfere with the normal work of circuit of synchronous rectification.
And when there is the anti-abnormal case filling electric current, i.e. freewheeling state terminates, when inductive current declines zero, if now same
The output end voltage Vout of step rectification circuit 2 is less than the circuit of synchronous rectification in another bridge synchronization rectification circuit that also machine connects
Output end voltage, then circuit of synchronous rectification 2 can produce and counter fill electric current.Now, have due to the outfan of circuit of synchronous rectification 2
High pressure is come in, and can cause the driving signal D of the driving signal A of the first switching tube in the full-bridge circuit of front end and the 4th switching tube simultaneously
Shorten for the low level time, or the driving signal C of the driving signal B of second switch pipe and the 3rd switching tube is low electricity simultaneously
The flat time shortens, and " the first signal source S1 is high level, and secondary signal source S2 is low level " is driving at the first switching tube
The driving signal D of dynamic signal A and the 4th switching tube is low level, or the driving signal B of second switch pipe and the 3rd switch
The driving signal C of pipe obtains when being low level, therefore the driving signal A of the first switching tube and the driving signal of the 4th switching tube
D shortens for the low level time simultaneously, or the driving signal C of the driving signal B of second switch pipe and the 3rd switching tube is simultaneously
Shorten for the low level time, then it represents that the state of " the first signal source S1 is high level, and secondary signal source S2 is low level " becomes
Short, namely represent that the charge-discharge circuit charging interval shortens, discharge time is elongated.And charge-discharge circuit is elongated for discharge time so that
After inductive current reduces to zero, discharge circuit also may proceed to electric discharge, then the first resistance R1 and the electricity of the second resistance R2 connecting place G
Pressure Vg may proceed to descend below reference voltage V ref, then the second comparator can overturn, and is output as low resistive state, then turn off and control electricity
Road drags down driving signal E and the driving of lower synchronous rectifier of upper synchronous rectifier by the first diode D1 and the second diode D2
Signal F, it is thus possible to turn off the upper synchronous rectifier in circuit of synchronous rectification and lower synchronous rectifier in time, it is to avoid anti-filling electric current pair
The full-bridge circuit of front end produces impact.
In sum, this detailed description of the invention prevents the circuit of current flowing backwards, can be when anti-filling electric current occur, in time
Turn off the upper synchronous rectifier in circuit of synchronous rectification and lower synchronous rectifier, avoid in time counter filling the electric current full-bridge electricity to front end
Road produces impact.
Fig. 3 illustrates a kind of specific implementation of logic conversion circuit, logic conversion circuit by four nor gates, six
Diode and two resistance are constituted, including the first nor gate U28-A, and the second nor gate U28-B, the 3rd nor gate U28-C, the 4th
Nor gate U28-D, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, the 7th diode D7,
9th diode D9, the 6th resistance R6 and the 7th resistance R7.Two inputs of the first nor gate U28-A connect second respectively and open
Close two inputs of the driving signal B of pipe and the driving signal C of the 3rd switching tube, the second nor gate U28-B and connect the respectively
The driving signal A of one switching tube and the driving signal D of the 4th switching tube, the anode of the 3rd diode D3, the 4th diode D4
First end of negative electrode and the 6th resistance R6 connects the outfan of the first nor gate U28-A after being connected, the anode of the 5th diode D5,
The negative electrode of the 6th diode D6 and first end of the 7th resistance R7 connect the outfan of the second nor gate U28-B after being connected, and the 3rd
The negative electrode of diode D3 and the negative electrode of the 5th diode D5 are the outfan of the first signal source S1 after being connected；4th diode D4's
The second segment of anode and the 6th resistance R6 is simultaneously connected with two inputs of the 3rd nor gate U28-C, the 6th diode after being connected
The anode of D6 and second end of the 7th resistance R7 are simultaneously connected with two inputs of four nor gate U28-D after being connected, and the seven or two
The negative electrode of pole pipe D7 connects the outfan of the 3rd nor gate U28-C, and the negative electrode of the 9th diode D9 connects four nor gate U28-D
Outfan, the anode of the 7th diode D7 and the anode of the 9th diode D9 are the outfan of secondary signal source S2 after being connected.
Can obtain according to this logic conversion circuit, as the driving signal B and the driving signal C of the 3rd switching tube of second switch pipe
When being low level, the first nor gate U28-A is output as high level；Driving signal A and the 4th switching tube when the first switching tube
Driving signal D when being low level, the second nor gate U28-B is output as high level.When the first nor gate U28-A is output as height
During level, due to the 4th diode D4 and the connection of the 6th resistance R6, then two inputs of the 3rd nor gate U28-C are high electricity
Flat, then the 3rd nor gate U28-C is output as low level；When the second nor gate U28-B is output as high level, due to the six or two pole
Pipe D6 and the connection of the 7th resistance R7, then two inputs of four nor gate U28-D are high level, then four nor gate U28-D
It is output as low level.As long as and having one in the first nor gate U28-A and the second nor gate U28-B is high level output, due to
3rd diode D3 and the connection of the 5th diode D5, then the first signal source S1 is just for high level.And the first nor gate U28-A with
As long as the second nor gate U28-B has one for high level output time, in the 3rd nor gate U28-C and four nor gate U28-D
Must have one is low level output, and due to the 7th diode D7 and the connection of the 9th diode D9, then secondary signal source S2 is just
Low level.Therefore, it is i.e. to achieve " when the driving signal A of the first switching tube and the driving signal D of the 4th switching tube is low electricity
Flat, or when the driving signal C of the driving signal B of second switch pipe and the 3rd switching tube is low level, the first signal source S1
For high level, secondary signal source S2 is low level " logistic transformation.
Preferably, as shown in Figure 4, the further preferred implementation of logic conversion circuit shown in Fig. 3, logic conversion circuit
Also include the 8th diode D8, the 8th resistance R8, the tenth diode D10 and the 9th resistance R9, the negative electrode of the 8th diode D8 and
First end of the 8th resistance R8 connects the outfan of the 3rd nor gate U28-C, the anode and the 8th of the 8th diode D8 after being connected
Second end of resistance R8 is the outfan of the 3rd signal source S3 after being connected；The negative electrode of the tenth diode D10 and the 9th resistance R9's
First end connects the outfan of four nor gate U28-D, the anode of the tenth diode D10 and the second of the 9th resistance R9 after being connected
End is the outfan of the 4th signal source S4 after being connected.According to logistic transformation, as the driving signal A and the 4th of the first switching tube
The driving signal D of switching tube is low level, and the driving signal B of second switch pipe and the driving signal C of the 3rd switching tube is
During high level, the 3rd signal source S3 is low level, and the 4th signal source S4 is high level；When the first switching tube driving signal A and
The driving signal D of the 4th switching tube is high level, the driving signal B of second switch pipe and the driving signal C of the 3rd switching tube
When being low level, the 3rd signal source S3 is high level, and the 4th signal source S4 is low level.And upper synchronization in circuit of synchronous rectification
Drive signal E, F of rectifier tube and lower synchronous rectifier with the conversion driving signal of in full-bridge circuit four switching tubes are i.e.
Above-mentioned conversion, therefore the 3rd signal source S3, the 4th signal source S4 can be supplied to synchronous rectification directly as driving signal E, F respectively
Upper synchronous rectifier in circuit, lower synchronous rectifier.The i.e. logic conversion circuit of this optimization obtains realizing logistic transformation
While one signal source S1 and secondary signal source S2, moreover it is possible to produce the synchronization driving signal to be supplied directly in circuit of synchronous rectification
Rectifier tube, then can omit in the drive circuit of bridge synchronization rectification circuit from the four of full-bridge circuit switching tube TRANSFORMATION OF THE DRIVING
Obtain the translation circuit driving signal of two synchronous rectifiers of circuit of synchronous rectification, save driving of bridge synchronization rectification circuit
Module in galvanic electricity road so that the circuit cost of bridge synchronization rectification circuit reduces.
Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from making some replacements or obvious modification on the premise of present inventive concept, and performance or purposes are identical, all should be considered as
Belong to protection scope of the present invention.
Claims (5)
1. preventing the anti-circuit filling electric current, in bridge synchronization rectification circuit, described bridge synchronization rectification circuit includes
Full-bridge circuit, transformator and circuit of synchronous rectification；Described full-bridge circuit includes by the first switching tube and the connection of second switch pipe
The first brachium pontis become, the 3rd switching tube and the 4th switching tube the second brachium pontis being formed by connecting；Described circuit of synchronous rectification is by upper
Synchronous rectifier, lower synchronous rectifier and inductance connection form；Described transformator include primary coil, the first secondary coil and
Second secondary coil, described primary coil is connected between the midpoint of described first brachium pontis and the midpoint of described second brachium pontis, institute
First end of the first end and described second secondary coil of stating the first secondary coil is connected, and the end that is connected connects the first of described inductance
End, the second end of described first secondary coil is connected with the first end of described upper synchronous rectifier, described second secondary coil T-B
The second end be connected with the first end of described lower synchronous rectifier, the second end of described upper synchronous rectifier is lower synchronization whole with described
Ground connection after second end of flow tube is connected, the outfan that the second end is described circuit of synchronous rectification of described inductance；It is characterized in that:
Described prevent the anti-circuit filling electric current from including logic conversion circuit and switching off control circuit；
Described logic conversion circuit receives the first switching tube, second switch pipe, the 3rd switching tube and the 4th in described full-bridge circuit
The driving signal of switching tube, carries out logistic transformation according to the driving signal of four switching tubes and produces the first signal source and secondary signal
Source；The logistic transformation relation of described logic conversion circuit is: when driving signal and described 4th switch of described first switching tube
The driving signal of pipe is low level, or described second switch pipe drive signal and the driving signal of described 3rd switching tube
When being low level, described first signal source is high level, and described secondary signal source is low level；
Described switch off control circuit include reference voltage generating circuit, charge-discharge circuit, the first comparator, the second comparator,
One diode and the second diode；Reference voltage generating circuit produces reference voltage；Described charge-discharge circuit include the first resistance,
Second resistance, the 3rd resistance and electric capacity, described first resistance, the second resistance and electric capacity composition charging circuit, described 3rd resistance
Discharge circuit is formed with electric capacity；First end of described first resistance receives described first signal source, the second of described first resistance
Hold and after being connected with the first end of described second resistance, be connected the positive input of described second comparator, the of described second resistance
Two ends connect the first end of described electric capacity, the first end of described 3rd resistance respectively, the second end ground connection of described electric capacity, and described
Second end of three resistance connects the outfan of described first comparator, the positive input of described first comparator and described second
The reverse input end of comparator receives described reference voltage, and the reverse input end of described first comparator receives described secondary signal
Source, the outfan of described second comparator connects the negative electrode of the first diode, the negative electrode of the second diode respectively, and the described 1st
The anode of pole pipe, the anode of the second diode connect the driving signal of described upper synchronous rectifier, described lower synchronous rectification respectively
The driving signal of pipe.
The most according to claim 1 prevent the anti-circuit filling electric current, it is characterised in that in switching off control circuit described in:, respectively
The parameter of device meets:Wherein, R1、R2、R3Represent the first resistance, the second resistance, the 3rd resistance respectively
Resistance, Vo represents the output end voltage of described circuit of synchronous rectification, and Vd represents that described first secondary coil is second secondary with described
Voltage at the connected end of sideline circle；And the resistance of described first resistance and the second resistance meets: described discharge circuit electric discharge knot
The voltage that Shu Shi, described first resistance and described second resistance are connected at end drops to equal to described reference voltage.
The most according to claim 1 prevent the anti-circuit filling electric current, it is characterised in that: described reference voltage generating circuit bag
Including the 4th resistance and the 5th resistance, the first end of described 4th resistance connects external power supply, and the second end of described 4th resistance is even
Connect the first end of described 5th resistance, the second end ground connection of described 5th resistance.
The most according to claim 1 prevent the anti-circuit filling electric current, it is characterised in that: described logic conversion circuit includes
One nor gate (U28-A), the second nor gate (U28-B), the 3rd nor gate (U28-C), four nor gate (U28-D), the three or two
Pole pipe (D3), the 4th diode (D4), the 5th diode (D5), the 6th diode (D6), the 7th diode (D7), the 9th 2 pole
Pipe (D9), the 6th resistance (R6) and the 7th resistance (R7)；Two inputs of described first nor gate (U28-A) connect institute respectively
That states second switch pipe drives signal and the driving signal of the 3rd switching tube, two inputs of described second nor gate (U28-B)
End connects driving signal and the driving signal of described 4th switching tube, described 3rd diode of described first switching tube respectively
(D3) anode, the negative electrode of described 4th diode (D4) connect described after being connected with the first end of described 6th resistance (R6)
The outfan of one nor gate (U28-A), the anode of described 5th diode (D5), the negative electrode of described 6th diode (D6) and
First end of seven resistance (R7) connects the outfan of described second nor gate (U28-B), described 3rd diode (D3) after being connected
Negative electrode be connected with the negative electrode of described 5th diode (D5) after for the outfan of described first signal source；Described 4th diode
(D4) anode is simultaneously connected with two of described 3rd nor gate (U28-C) with the second end of described 6th resistance (R6) after being connected
Input, the anode of described 6th diode (D6) is simultaneously connected with described after being connected with the second end of described 7th resistance (R7)
Two inputs of four nor gate (U28-D), the negative electrode of described 7th diode (D7) connects described 3rd nor gate (U28-C)
Outfan, the negative electrode of described 9th diode (D9) connects the outfan of described four nor gate (U28-D), the described 7th 2
The anode of pole pipe (D7) is the outfan in described secondary signal source after being connected with the anode of described 9th diode (D9).
The most according to claim 4 prevent the anti-circuit filling electric current, it is characterised in that: described logic conversion circuit also includes
8th diode (D8), the 8th resistance (R8), the tenth diode (D10) and the 9th resistance (R9), described 8th diode (D8)
Negative electrode be connected with the first end of described 8th resistance (R8) after connect the outfan of described 3rd nor gate (U28-C), described
The anode of the 8th diode (D8) is the outfan of the 3rd signal source after being connected with the second end of described 8th resistance (R8)；Described
The negative electrode of the tenth diode (D10) connects described four nor gate (U28-after being connected with the first end of described 9th resistance (R9)
D) outfan, the anode of described tenth diode (D10) is the 4th letter after being connected with the second end of described 9th resistance (R9)
The outfan in number source.
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| CN201110210247.2A CN102255287B (en) | 2011-07-26 | 2011-07-26 | A kind of prevent the anti-circuit filling electric current |
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| CN201110210247.2A CN102255287B (en) | 2011-07-26 | 2011-07-26 | A kind of prevent the anti-circuit filling electric current |
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| DE102018125272A1 (en) * | 2018-10-12 | 2020-04-16 | Valeo Siemens Eautomotive Germany Gmbh | Device and method for discharging an intermediate circuit capacitor, converter and vehicle |
| CN112751475B (en) * | 2020-12-31 | 2023-02-24 | 深圳市核达中远通电源技术股份有限公司 | Novel synchronous rectification backflow-preventing circuit |
| CN113179034A (en) * | 2021-04-26 | 2021-07-27 | 长城电源技术有限公司 | Synchronous rectification control circuit |
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| CN101667783B (en) * | 2008-09-05 | 2013-01-30 | 艾默生网络能源系统北美公司 | Synchronous rectification drive device and method for converter |
| CN101527525A (en) * | 2009-04-08 | 2009-09-09 | 李成勇 | Synchronous rectification external drive proposal |
| CN101902136B (en) * | 2009-05-26 | 2013-07-31 | 艾默生网络能源系统北美公司 | Driving device and driving method for synchronous rectifying tube |
| CN201690364U (en) * | 2010-05-21 | 2010-12-29 | 深圳市核达中远通电源技术有限公司 | Circuit for preventing current flowing backwards |
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Address after: 518055 Shenzhen City, Shenzhen, Guangdong, Nanshan District Taoyuan street, Liu Xian Avenue, No. 1268 honghualing industrial North District, 1 Patentee after: Shenzhen holdluck-zyt supply technology Limited by Share Ltd Address before: 518055 Shenzhen City, Shenzhen, Guangdong, Nanshan District Taoyuan street, Liu Xian Avenue, No. 1268 honghualing industrial North District, 1 Patentee before: ShenZhen VAPEL Power Supply Technology Co., Ltd. |
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Address after: 518116 Shenzhen, Longgang, Guangdong Longgang District, Baolong Industrial Zone, Longgang Road, three road 4, A Building 1, 2 floor B building 3, 4 floor C building 3, 4 Building D Patentee after: Shenzhen holdluck-zyt supply technology Limited by Share Ltd Address before: 518055 Shenzhen City, Shenzhen, Guangdong, Nanshan District Taoyuan street, Liu Xian Avenue, No. 1268 honghualing industrial North District, 1 Patentee before: Shenzhen holdluck-zyt supply technology Limited by Share Ltd |