CN209375492U - The passive flexible switch full-bridge circuit that upper and lower bridge arm can be prevented straight-through - Google Patents
The passive flexible switch full-bridge circuit that upper and lower bridge arm can be prevented straight-through Download PDFInfo
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- CN209375492U CN209375492U CN201920398104.0U CN201920398104U CN209375492U CN 209375492 U CN209375492 U CN 209375492U CN 201920398104 U CN201920398104 U CN 201920398104U CN 209375492 U CN209375492 U CN 209375492U
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Abstract
The utility model discloses the passive flexible switch full-bridge circuits that one kind can prevent upper and lower bridge arm straight-through, are made of hard switching full-bridge circuit, output transformer and compensation circuit；Hard switching full-bridge circuit switching characteristic be it is diagonal open-minded, be specifically made of left arm path and right arm path；Left arm path includes power switch tube under power switch tube and left bridge arm on left bridge arm, and right arm path includes power switch tube under power switch tube and right bridge arm on right bridge arm；Transformer series are exported on left bridge arm under power switch tube and right bridge arm between power switch tube and on right bridge arm under power switch tube and left bridge arm between power switch tube；Compensation circuit includes left bridge arm compensation circuit and right bridge arm compensation circuit, and left bridge arm compensation circuit is in parallel with power switch tube under left bridge arm, and right bridge arm compensation circuit is in parallel with power switch tube under right bridge arm；The utility model can prevent occurring the problem of upper and lower bridge arm direct pass in full-bridge circuit.
Description
[technical field]
The utility model belongs to power electronics branch field, and in particular to it is passive that one kind can prevent upper and lower bridge arm from leading directly to
Soft switch full translation circuit.
[background technique]
Supply convertor is that a kind of power supply is transformed to the converting means of another power supply.Large power supply is become
It changes, inverter transformation, often selects full-bridge type translation circuit.Traditional full-bridge type translation circuit, due to power switch tube
Switch time influences, and causes biggish switching loss, so that the switch efficiency of full-bridge type translation circuit is influenced, and Yi Yinshang,
The straight-through problem of lower bridge arm, influences the reliability of supply convertor.
In order to improve the switching characteristic of hard-switching converter, many methods are proposed, including active soft switching technology, passive
The full-bridge passive flexible switch converter technology of soft switch technique, phase-shift PWM controlled, but these technologies have certain restrictive condition
It is limited by very large its application.
The straight-through problem of the upper and lower bridge arm of full-bridge converter in order to prevent, also proposes many solutions, such as: in bridge
Be added in arm back suction circuit, in bridge arm paralleled power switches Ultrafast recovery diode, the methods of inductance is passed between upper and lower bridge arm,
But there is no fundamentally prevent upper and lower bridge arm direct pass for these methods.
[utility model content]
The purpose of the utility model is to provide the passive flexible switch full-bridge circuit that one kind can prevent upper and lower bridge arm straight-through,
The problem of to prevent upper and lower bridge arm direct pass.
The utility model uses following technical scheme: the passive flexible switch full-bridge transformation that one kind can prevent upper and lower bridge arm straight-through
Circuit is made of hard switching full-bridge circuit, output transformer and compensation circuit；
Hard switching full-bridge circuit switching characteristic is diagonal open-minded, specifically by left arm path and right arm path structure
At；Left arm path includes power switch tube under power switch tube and left bridge arm on left bridge arm, and right arm path includes right bridge arm
Power switch tube under upper power switch tube and right bridge arm；
Transformer series are exported on left bridge arm under power switch tube and right bridge arm between power switch tube and right bridge arm
Under upper power switch tube and left bridge arm between power switch tube；
Compensation circuit includes left bridge arm compensation circuit and right bridge arm compensation circuit, and left bridge arm compensation circuit and left bridge arm are simultaneously
Connection, right bridge arm compensation circuit are in parallel with right bridge arm.
Further, output transformer includes the first armature winding, the second armature winding and output winding；First it is primary around
Group is wound on same magnetic core with the second armature winding, coiling circle number is identical and mutually indepedent；
The in-phase end of first armature winding is connected with the source electrode of power switch tube on left bridge arm, under non-in-phase end and right bridge arm
Power switch tube with drain electrode be connected；The drain electrode of power switch tube connects positive voltage terminal on left bridge arm, grid connects the first driving signal；
The source electrode of power switch tube connects ground terminal under right bridge arm, grid connects fourth drive signal；
The in-phase end of second armature winding is connected with the drain electrode of power switch tube under left bridge arm, on non-in-phase end and right bridge arm
The source electrode of power switch tube is connected；The source electrode of power switch tube connects ground terminal under left bridge arm, grid connects third driving signal；Right bridge
The drain electrode of power switch tube connects positive voltage terminal on arm, grid connects the second driving signal.
Further, it is also in series between the drain electrode of power switch tube under the non-in-phase end and right bridge arm of the first armature winding
First buffer inductance, the in-phase end of the first buffer inductance is connected with the non-in-phase end of the first armature winding, non-in-phase end and You Qiao
The drain electrode of power switch tube is connected under arm；
The second buffering is also connected between the source electrode of power switch tube on the non-in-phase end and right bridge arm of second armature winding
Inductance, the in-phase end of the second buffer inductance is connected with the non-in-phase end of the second armature winding, power on non-in-phase end and right bridge arm
The source electrode of switching tube is connected.
Further, output transformer further includes having left bridge arm auxiliary winding and right bridge arm auxiliary winding, left bridge arm auxiliary
Winding, right bridge arm auxiliary winding, the first armature winding and the second armature winding are wound on same magnetic core, coiling circle number is identical,
And it is mutually indepedent.
Further, the non-in-phase end of left bridge arm auxiliary winding is connected to ground terminal, and in-phase end is compensated back by left bridge arm
Road is respectively connected to the drain electrode of power switch tube under the source electrode of power switch tube and left bridge arm on left bridge arm；
The in-phase end of right bridge arm auxiliary winding is connected to ground terminal, and non-in-phase end compensates circuit by right bridge arm and is separately connected
The drain electrode of power switch tube under to the source electrode and right bridge arm of power switch tube on right bridge arm.
Further, left bridge arm compensation circuit includes the left bridge arm height that anode is connected with left bridge arm auxiliary winding in-phase end
Frequency rectifier diode, the cathode of left bridge arm high-frequency rectification diode are connected with left bridge arm compensating electric capacity, left bridge arm compensating electric capacity
Another termination ground terminal；
The ungrounded end of left bridge arm compensating electric capacity is additionally coupled to the anode of left bridge arm compensation diode, and left bridge arm compensates two poles
The cathode of pipe is connected to the source electrode of power switch tube on left bridge arm；
The ungrounded end of left bridge arm compensating electric capacity is additionally coupled to the cathode of left bridge arm absorption diode, and left bridge arm absorbs two poles
The anode of pipe is connected to the drain electrode of power switch tube under left bridge arm.
Further, right bridge arm compensation circuit includes the right bridge that anode is connected with the non-in-phase end of right bridge arm auxiliary winding
Arm high-frequency rectification diode, the cathode of right bridge arm high-frequency rectification diode are connected with right bridge arm compensating electric capacity, right bridge arm compensation electricity
The other end of appearance connects ground terminal；
The ungrounded end of right bridge arm compensating electric capacity is additionally coupled to the anode of right bridge arm absorption diode, and right bridge arm absorbs two poles
The cathode of pipe is connected to the source electrode of power switch tube on right bridge arm；
The ungrounded end of right bridge arm compensating electric capacity is additionally coupled to the cathode of right bridge arm absorption diode, and right bridge arm absorbs two poles
The anode of pipe is connected to the drain electrode of right bridge arm power switch tube.
Further, the equal turn numbers of the first buffer inductance and the second buffer inductance, and be wound on same magnetic core.
The beneficial effects of the utility model are: changing traditional transformation on the basis of traditional hard switching full-bridge converter
The winding method of device, the driving pulse for correcting traditional hard switching full-bridge, an additional double winding buffer inductance and two sets are by three
The unique passive flexible switch network that high speed fast recovery diode, a high frequency is noninductive absorption capacitor are constituted can prevent upper and lower
Bridge arm direct pass, provides that a kind of fixed frequency passive flexible switch full-bridge type translation circuit is newly topological, with succinct topological, lower
Cost, upper and lower bridge arm direct pass can be prevented and with less energy exchange and transmitting circuit, lower loss, relatively strong by reaching
Buffering effect, achieve the effect that switching tube is soft and open/soft switching.
[Detailed description of the invention]
Fig. 1 is the circuit theory schematic diagram of the utility model；
Fig. 2 is the transformer winding schematic diagram in the utility model embodiment 1；
Fig. 3 is the schematic diagram of drive waveforms, transformer voltage waveform, output waveform in the utility model embodiment；
Fig. 4 is the power conversion partial circuit design drawing of the AC/DC converter of the utility model embodiment 1.
[specific embodiment]
The utility model is described in detail with reference to the accompanying drawings and detailed description.
Embodiment 1:
As shown in Figure 1, the passive flexible switch full-bridge circuit of upper and lower bridge arm direct pass can be prevented for the utility model one kind
Schematic diagram.The present embodiment is obtained according to the principle diagram design, and present embodiment discloses one kind can prevent upper and lower bridge arm direct pass
Passive flexible switch full-bridge circuit, as shown in figure 4, being the power conversion part of full-bridge circuit.The design mesh of this example
Mark is that 220V AC power source is transformed to 28V, 40A, output power for the DC power supply of 1KW.Input terminal is using rectification and power
Alternating current 220V power conversion is direct current 375V power supply (Vp voltage in this example) by factor correction technology；Control circuit use with
UC1856 current type PWM controls the circuit that chip is core, provides driving pulse for the present embodiment power conversion part, wherein
P1, P2 directly adopt UC1856 output pwm pulse, P3, P4 use transformed and P1, P2 same frequency but duty ratio for
50% pulse.Output voltage signal, output current signal are fed back to control panel in this example, after processing to PWM pulsewidth into
Row modulation.
Full-bridge type translation circuit uses circuit disclosed by the utility model, is typical bridge converter, special coiling
Transformer, inductance and left and right bridge arm compensation circuit are constituted.Wherein, typical bridge converter is divided into left and right by four switching tubes
Two bridge arms are constituted, and switching characteristic is diagonal open-minded, i.e., when power switch tube is opened on left bridge arm, power is opened under right bridge arm
It is also open-minded to close pipe；When power switch tube is opened on right bridge arm, power switch tube is also open-minded under left bridge arm, and electric current is always by left bridge
Power switch tube flows into power switch tube under right bridge arm or is opened by power under the left bridge arm of power switch tube inflow on right bridge arm on arm
Guan Guan.Unlike traditional PWM driving method: when power switch tube turns off on left bridge arm, power switch tube under right bridge arm
Continue open-minded, is turned off at the end of the half period；When power switch tube turns off on right bridge arm, under left bridge arm power switch tube after
Continue open-minded, is turned off at the end of the half period；To realize no-voltage/zero-current switching of two down tubes.In the present embodiment
Each power switch tube has selected FCH47N60 field-effect tube.
Power conversion circuit is made of hard switching full-bridge circuit, the output transformer of special coiling and compensation circuit,
Its power output part is made of simple full-wave rectification, low-pass filter circuit.Hard switching full-bridge circuit is by left bridge arm branch
Road and right arm path are constituted.Left arm path includes power switch tube, right bridge under power switch tube and left bridge arm on left bridge arm
Arm branch includes power switch tube under power switch tube and right bridge arm on right bridge arm.
It exports the first armature winding of transformer and passes through the first windings in series of buffer inductance power switch on the left bridge arm
Under pipe and right bridge arm between power switch tube, output the second armature winding of transformer by the second windings in series of buffer inductance on the right side
On bridge arm under power switch tube and left bridge arm between power switch tube.The output transformer of special coiling is specifically included in same magnetic
The circle number of coiling on core is identical and mutually independent first armature winding, the second armature winding, left bridge arm auxiliary winding and You Qiao
Arm auxiliary winding.In the present embodiment, as shown in Fig. 2, the first armature winding Ts1 and the second armature winding Ts2 are all made of diameter
Enclosed for the coiling coiling 70 of 0.8mm, left bridge arm auxiliary winding and right bridge arm auxiliary winding be all made of coiling that diameter is 0.1mm around
70 circle of system.Output winding Lo is constituted using Double-wire parallel wound mode, is enclosed using two copper foil coilings 6 with a thickness of 0.5mm.
In the present embodiment, the output transformer of special coiling is as shown in Fig. 2, magnetic core uses ETD-49, primary coil
Be divided into two be completely independent, the identical coil of the number of turns, be connected respectively with left and right bridge arm, cut off from physical channel left and right
The connection relationship of the upper and lower switching tube of bridge arm thoroughly solves the problems, such as the upper and lower bridge arm direct pass of conventional bridge converter.Due to not
There are upper and lower bridge arms to lead directly to problem, completely can not in parallel Ultrafast recovery diode is (such as between the drain-source pole of four switching tubes
VD1, VD2, VD3, VD4 shown in figure dotted line), to prevent due to V-MOS pipe endophyte reverse recovery time of diode is longer
Caused by upper and lower bridge arm it is straight-through.
In primary side, increase two completely self-contained auxiliary windings (i.e. left bridge arm auxiliary winding and right bridge arm auxiliary around
Group), coiling the number of turns of auxiliary winding is identical with armature winding the number of turns, therefore the voltage phase of the voltage and armature winding incuded thereon
Together, it can be used to implement the zero voltage turn-off of two upper bridge arm switching tubes.
Secondary coil is used for power output, and winding method is depending on actual needs, with general transformer winding mode
It achieves that.
It is avoided in left arm path and right arm path by the first armature winding Ts1 and the second armature winding Ts2
Upper and lower power switch tube (power switch tube V3 under power switch tube V1 and right bridge arm, power switch on right bridge arm on i.e. left bridge arm
Power switch tube V4 under pipe V2 and left bridge arm) between lead directly to, in order to avoid causing short circuit, entire full-bridge circuit is caused to damage.
The in-phase end of first armature winding is connected with the source electrode of power switch tube V1 on left bridge arm, non-in-phase end and right bridge arm
The drain electrode of lower power switch tube V4 is connected.Specifically, power switch tube under the non-in-phase end of the first armature winding Ts1 and right bridge arm
The first buffer inductance Ls1 (3.3uH/5A) is also in series between the drain electrode of V4, at the beginning of the in-phase end and first of the first buffer inductance Ls1
The non-in-phase end of grade winding Ts1 is connected, non-in-phase end is connected with the drain electrode of power switch tube V4 under right bridge arm.
The drain electrode of power switch tube V1 meets positive voltage terminal VP on left bridge arm, grid meets the first driving signal P1.Under right bridge arm
The source electrode of power switch tube V4 connects ground terminal (GND), grid meets fourth drive signal P4.
The in-phase end of second armature winding Ts2 is connected with the drain electrode of power switch tube V3 under left bridge arm, non-in-phase end and the right side
The source electrode of power switch tube V2 is connected on bridge arm.Power switch tube V2 on the non-in-phase end and right bridge arm of second armature winding Ts2
Source electrode between be also in series with the second buffer inductance Ls2, the in-phase end of the second buffer inductance Ls2 (3.3uH/5A) and second primary
The non-in-phase end of winding Ts1 is connected, non-in-phase end is connected with the source electrode of power switch tube V2 on right bridge arm.
The equal turn numbers of first buffer inductance and the second buffer inductance in the present embodiment, and be wound on same magnetic core.
The source electrode of power switch tube V3 connects ground terminal (GND) under left bridge arm, grid meets third driving signal P3；On right bridge arm
The drain electrode of power switch tube V2 meets positive voltage terminal VP, grid meets the second driving signal P2.
The first driving signal P1, the second driving signal P2 in the present embodiment is PWM drive signal, third driving letter
Number P3 and fourth drive signal P4 is the driving signal that duty ratio is 50%.
Compensation circuit includes left bridge arm compensation circuit and right bridge arm compensation circuit, and left bridge arm compensation circuit and left bridge arm are simultaneously
Connection, right bridge arm compensation circuit are in parallel with right bridge arm.
The non-in-phase end of left bridge arm auxiliary winding Ts3 is connected to ground terminal, and in-phase end compensates circuit difference by left bridge arm
It is connected to the drain electrode of power switch tube V3 under the source electrode of power switch tube V1 and left bridge arm on left bridge arm.
Left bridge arm compensation circuit includes that the left bridge arm high frequency that is connected with the in-phase end of left bridge arm auxiliary winding Ts3 of anode is whole
It flows diode D5 (HER107), the non-in-phase end of left bridge arm auxiliary winding Ts3 (TBC-ETD49-02) is connected to ground terminal, Zuo Qiao
The cathode of arm high-frequency rectification diode D5 is connected with one end of left bridge arm compensating electric capacity CS1 (4700pF/2KV), left bridge arm compensation
The other end of capacitor CS1 connects ground terminal.The ungrounded end of left bridge arm compensating electric capacity CS1 is additionally coupled to left bridge arm compensation diode
The cathode of the anode of D1 (HER107), left bridge arm compensation diode D1 is connected to the source electrode of power switch tube V1 on left bridge arm.It is left
The ungrounded end of bridge arm compensating electric capacity CS1 is additionally coupled to the cathode of left bridge arm absorption diode D2 (HER107), and left bridge arm absorbs
The anode of diode D2 is connected to the drain electrode of power switch tube V3 under left bridge arm.
The in-phase end of right bridge arm auxiliary winding Ts4 (TBC-ETD49-02) is connected to ground terminal, and non-in-phase end passes through right bridge
Arm compensation circuit is respectively connected to the drain electrode of power switch tube V4 under the source electrode of power switch tube V2 and right bridge arm on right bridge arm.
Right bridge arm compensation circuit includes the right bridge arm high frequency that anode is connected with the non-in-phase end of right bridge arm auxiliary winding Ts4
The in-phase end of rectifier diode D6 (HER107), right bridge arm auxiliary winding Ts4 (TBC-ETD49-02) are connected to ground terminal, right bridge
The cathode of arm high-frequency rectification diode D6 is connected with one end of right bridge arm compensating electric capacity CS2 (4700pF/2KV), right bridge arm compensation
The other end of capacitor CS2 connects ground terminal.The ungrounded end of right bridge arm compensating electric capacity CS2 is additionally coupled to right bridge arm absorption diode
The cathode of the anode of D3 (HER107), right bridge arm absorption diode D3 is connected to the source electrode of power switch tube V2 on right bridge arm.It is right
The ungrounded end of bridge arm compensating electric capacity CS2 is additionally coupled to the cathode of right bridge arm absorption diode D4 (HER107), and right bridge arm absorbs
The anode of diode D4 is connected to the drain electrode of power switch tube V4 under right bridge arm.
Above-mentioned circuit arrangement in through this embodiment can prevent the bridge up and down in left arm path and right arm path
The straight-through problem of arm (on i.e. left bridge arm on power switch tube V1 and lower power switch tube V3, right bridge arm power switch tube V2 and under
Power switch tube V4), and topology is succinct, at low cost, can be with less energy exchange and transmitting circuit, lower loss, relatively strong
Buffering effect, achieve the effect that switching tube is soft and open/soft switching.
The control method of the utility model are as follows:
Using revised PWM drive signal, i.e. driving pulse is the PWM wave being corrected.As shown in figure 3, being driven first
Dynamic signal P1 and the second driving signal P2 is pwm pulse, and third driving signal P3 and fourth drive signal P4 are that duty ratio is
50% half period full conduction pulses.
t0Moment is high level to the second driving signal P2, third driving signal P3, drives power switch tube on right bridge arm
Power switch tube V3 is connected under V2, left bridge arm, makes the electric current of main bridge arm by the second buffer inductance Ls2, again passes through the second primary
Winding Ts2, due to the presence of the second buffer inductance (Ls2), electric current is started from scratch growth, realizes zero current turning-on.If full-bridge
Translation circuit is in electric current continuous duty, then Vcs2=Vp, can also realize that the no-voltage of V2 is open-minded, due to Vcs1=0, also
The no-voltage that V3 can be achieved is open-minded,
t1~t2At the moment, power switch tube V3 is fully under power switch tube V2, left bridge arm on right bridge arm, flows through specified
Electric current, circuit is with the work of hard switching full-bridge type translation circuit.Right bridge arm auxiliary winding Ts4 passes through right bridge arm high-frequency rectification two simultaneously
Bridge arm compensating electric capacity CS2's pole pipe D6 charges to the right, and since the number of turns of Ts2 and the number of turns of Ts4 are identical, therefore Vcs2=Vp is (suddenly
Slightly diode decompression).
t2Moment, the second driving signal P2 of setting become low level, and power switch tube V2 is turned off on right bridge arm, realizes bridge-type
The PWM of translation circuit is controlled.At this point, due to Vcs2=Vp, therefore power switch tube V2 is zero voltage turn-off on right bridge arm.
t2~t3At the moment, power switch tube V3 continues to be connected under left bridge arm, release output stray transformer flux inductance, second slow
The energy stored on inductance Ls2 and right bridge arm compensating electric capacity CS2 is rushed, Vcs2=0 (ignoring diode decompression) is made.
t3Moment, third driving signal P3 become low level, and power switch tube V3 is turned off under left bridge arm；At this point, due to
The energy stored on two buffer inductance Ls2 and right bridge arm compensating electric capacity CS2 has discharged, and flows through power switch tube V3 under left bridge arm
Electric current is zero, and the voltage between drain-source is also zero, V3D-S=0, Ls2=0, thus under left bridge arm power switch tube V3 be zero current/
No-voltage is closed.
t3~t4Moment, the first driving signal P1, the second driving signal P2, third driving signal P3 and fourth drive signal
P4 is low level, power switch tube V1 on left bridge arm, on right bridge arm under power switch tube V2, left bridge arm power switch tube V3 and
Power switch tube V4 is in off state under right bridge arm.At this point, if full-bridge type translation circuit is in electric current continuous duty
(the most common working condition of full-bridge type translation circuit), then the second buffer inductance Ls2 compensates diode D2 bridge to the left by left bridge arm
Arm compensating electric capacity CS1 charging, makes Vcs1=Vp.If third driving signal P3 and fourth drive signal P4 use duty ratio for
50% pulse, i.e. t3~t4=0, then without this state, but have no effect on the Sofe Switch characteristic of switching tube.
t4Moment drives power on left bridge arm when the first driving signal P1, fourth drive signal P4 are that high level is effective
Power switch tube V4 is connected under switching tube V1, right bridge arm, and the electric current of main bridge arm is made to flow through the first armature winding Ts1, then passes through the
One buffer inductance Ls1, due to the presence of buffer inductance Ls1, electric current is started from scratch growth, realizes zero current turning-on.If full-bridge
Formula translation circuit is in electric current continuous duty, then Vcs1=Vp, can also realize that the no-voltage of V1 is open-minded；Due to depositing for CS2
Also it can realize that the no-voltage of V4 is open-minded.
t4~t5At the moment, power switch tube V4 is fully under power switch tube V1, right bridge arm on left bridge arm, flows through specified
Electric current, circuit is with the work of hard switching full-bridge type translation circuit.Left bridge arm auxiliary winding Ts3 passes through left bridge arm high-frequency rectification two simultaneously
Bridge arm compensating electric capacity CS1's pole pipe D5 charges to the left, and since the number of turns of Ts1 and the number of turns of Ts3 are identical, therefore Vcs1=Vp is (suddenly
Slightly diode drop).
t5Moment, the first driving signal P1 become low level, and power switch tube V1 is turned off on left bridge arm, realize bridge-type transformation
The PWM of circuit is controlled.At this point, due to Vcs1=Vp, therefore power switch tube V1 is zero voltage turn-off on left bridge arm.
t5~t6At the moment, power switch tube V4 continues to be connected under right bridge arm, release stray transformer flux inductance, the first buffering electricity
The energy stored on sense Ls1 and left bridge arm compensating electric capacity CS1, makes Vcs1=0 (ignoring diode drop).
t6Moment, fourth drive signal P4 become low level, and power switch tube V4 is turned off under right bridge arm.At this point, due to
The energy stored on one buffer inductance Ls1 and left bridge arm compensating electric capacity CS1 has discharged, and flows through power switch tube V4 under right bridge arm
Electric current is zero, and the voltage between drain-source is also zero, V4D-S=0, Ls1=0, thus under right bridge arm power switch tube V4 be zero current/
No-voltage is closed.
t6~t7Moment, the first driving signal P1, the second driving signal P2, third driving signal P3 and fourth drive signal
P4 is low level, on left bridge arm power upper switch pipe V1, right bridge arm under power switch tube V2, left bridge arm power switch tube V3 and
Power switch tube V4 is in off state under right bridge arm.At this point, if full-bridge type translation circuit is in electric current continuous duty,
Then left bridge arm compensating electric capacity CS1, the first buffer inductance Ls1 are filled by right bridge arm absorption diode D4 to the second buffering capacitor CS2
Electricity makes Vcs2=Vp.
If third driving signal P3 and fourth drive signal P4 use duty ratio for 50% pulse, i.e. t3~t4=0,
Then without this state, but have no effect on the Sofe Switch characteristic of switching tube.
By above-mentioned switching cycles, the voltage status of available secondary coil as shown in Figure 3, in t8Moment
(as new t0Moment) the continuous circulation that plays the process, power conversion and the effect that stabilizes the output voltage are completed, until output
Voltage course terminates.
Claims (8)
1. the passive flexible switch full-bridge circuit that one kind can prevent upper and lower bridge arm straight-through, which is characterized in that by hard switching full-bridge
Translation circuit, output transformer and compensation circuit are constituted；
The hard switching full-bridge circuit switching characteristic is diagonal open-minded, specifically by left arm path and right arm path structure
At；The left arm path includes power switch tube, the right arm path packet under power switch tube and left bridge arm on left bridge arm
Include on right bridge arm power switch tube under power switch tube and right bridge arm；
The output transformer series are between power switch tube and right under power switch tube and right bridge arm on the left bridge arm
On bridge arm under power switch tube and left bridge arm between power switch tube；
The compensation circuit includes left bridge arm compensation circuit and right bridge arm compensation circuit, and the left bridge arm compensates circuit and left bridge arm
Parallel connection, right bridge arm compensation circuit are in parallel with right bridge arm.
2. the passive flexible switch full-bridge circuit that one kind as described in claim 1 can prevent upper and lower bridge arm straight-through, feature
It is, the output transformer includes the first armature winding, the second armature winding and output winding；First armature winding and
Second armature winding is wound on same magnetic core, coiling circle number is identical and mutually indepedent；
The in-phase end of first armature winding is connected with the source electrode of power switch tube on left bridge arm, under non-in-phase end and right bridge arm
Power switch tube with drain electrode be connected；The drain electrode of power switch tube connects positive voltage terminal on the left bridge arm, grid connects the first driving
Signal；The source electrode of power switch tube connects ground terminal under the right bridge arm, grid connects fourth drive signal；
The in-phase end of second armature winding is connected with the drain electrode of power switch tube under left bridge arm, on non-in-phase end and right bridge arm
The source electrode of power switch tube is connected；The source electrode of power switch tube connects ground terminal under the left bridge arm, grid connects third driving signal；
The drain electrode of power switch tube connects positive voltage terminal on the right bridge arm, grid connects the second driving signal.
3. the passive flexible switch full-bridge circuit that one kind as claimed in claim 2 can prevent upper and lower bridge arm straight-through, feature
It is, is also in series with the first buffering between the drain electrode of power switch tube under the non-in-phase end and right bridge arm of first armature winding
Inductance, the in-phase end of first buffer inductance are connected, under non-in-phase end and right bridge arm with the non-in-phase end of the first armature winding
The drain electrode of power switch tube is connected；
The second buffering is also connected between the source electrode of power switch tube on the non-in-phase end and right bridge arm of second armature winding
Inductance, the in-phase end of second buffer inductance are connected, on non-in-phase end and right bridge arm with the non-in-phase end of the second armature winding
The source electrode of power switch tube is connected.
4. the passive flexible switch full-bridge circuit that one kind as described in claims 1 or 2 or 3 can prevent upper and lower bridge arm straight-through,
It is characterized in that, the output transformer further includes having left bridge arm auxiliary winding and right bridge arm auxiliary winding, the left bridge arm is auxiliary
Winding, right bridge arm auxiliary winding, the first armature winding and the second armature winding is helped to be wound on same magnetic core, coiling circle number phase
It is same and mutually indepedent.
5. the passive flexible switch full-bridge circuit that one kind as claimed in claim 4 can prevent upper and lower bridge arm straight-through, feature
It is, the non-in-phase end of the left bridge arm auxiliary winding is connected to ground terminal, and in-phase end compensates circuit by left bridge arm and connects respectively
It is connected to the drain electrode of power switch tube under the source electrode of power switch tube and left bridge arm on left bridge arm；
The in-phase end of the right bridge arm auxiliary winding is connected to ground terminal, and non-in-phase end compensates circuit by right bridge arm and is separately connected
The drain electrode of power switch tube under to the source electrode and right bridge arm of power switch tube on right bridge arm.
6. the passive flexible switch full-bridge circuit that one kind as claimed in claim 5 can prevent upper and lower bridge arm straight-through, feature
It is, the left bridge arm compensation circuit includes the left bridge arm high-frequency rectification two that anode is connected with left bridge arm auxiliary winding in-phase end
The cathode of pole pipe, the left bridge arm high-frequency rectification diode is connected with left bridge arm compensating electric capacity, left bridge arm compensating electric capacity it is another
Terminate ground terminal；
The ungrounded end of the left bridge arm compensating electric capacity is additionally coupled to the anode of left bridge arm compensation diode, the left bridge arm compensation
The cathode of diode is connected to the source electrode of power switch tube on left bridge arm；
The ungrounded end of the left bridge arm compensating electric capacity is additionally coupled to the cathode of left bridge arm absorption diode, and the left bridge arm absorbs
The anode of diode is connected to the drain electrode of power switch tube under left bridge arm.
7. the passive flexible switch full-bridge circuit that one kind as claimed in claim 5 can prevent upper and lower bridge arm straight-through, feature
It is, right bridge arm compensation circuit includes that the right bridge arm high frequency that is connected with the non-in-phase end of right bridge arm auxiliary winding of anode is whole
Diode is flowed, the cathode of the right bridge arm high-frequency rectification diode is connected with right bridge arm compensating electric capacity, the right bridge arm compensation electricity
The other end of appearance connects ground terminal；
The ungrounded end of the right bridge arm compensating electric capacity is additionally coupled to the anode of right bridge arm absorption diode, and the right bridge arm absorbs
The cathode of diode is connected to the source electrode of power switch tube on right bridge arm；
The ungrounded end of the right bridge arm compensating electric capacity is additionally coupled to the cathode of right bridge arm absorption diode, and the right bridge arm absorbs
The anode of diode is connected to the drain electrode of right bridge arm power switch tube.
8. the passive flexible switch full-bridge circuit that one kind as claimed in claim 3 can prevent upper and lower bridge arm straight-through, feature
It is, the equal turn numbers of first buffer inductance and the second buffer inductance, and is wound on same magnetic core.
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| CN201920398104.0U CN209375492U (en) | 2019-03-27 | 2019-03-27 | The passive flexible switch full-bridge circuit that upper and lower bridge arm can be prevented straight-through |
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| CN201920398104.0U CN209375492U (en) | 2019-03-27 | 2019-03-27 | The passive flexible switch full-bridge circuit that upper and lower bridge arm can be prevented straight-through |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802585A (en) * | 2019-03-27 | 2019-05-24 | 西安太世德航空电器有限公司 | The passive flexible switch full-bridge circuit and method that upper and lower bridge arm can be prevented straight-through |
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2019
- 2019-03-27 CN CN201920398104.0U patent/CN209375492U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802585A (en) * | 2019-03-27 | 2019-05-24 | 西安太世德航空电器有限公司 | The passive flexible switch full-bridge circuit and method that upper and lower bridge arm can be prevented straight-through |
| CN109802585B (en) * | 2019-03-27 | 2023-12-19 | 西安太世德航空电器有限公司 | Passive soft switch full-bridge conversion circuit and method capable of preventing upper bridge arm and lower bridge arm from being directly connected |
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Inventor after: Chen Liang Inventor after: Yang Danjiang Inventor before: Chen Liang Inventor before: Yang Danjiang Inventor before: Zou Wu Inventor before: Cai Wenbo |