CN109921649A - A kind of bridge-type DC converter - Google Patents
A kind of bridge-type DC converter Download PDFInfo
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- CN109921649A CN109921649A CN201910241628.3A CN201910241628A CN109921649A CN 109921649 A CN109921649 A CN 109921649A CN 201910241628 A CN201910241628 A CN 201910241628A CN 109921649 A CN109921649 A CN 109921649A
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Abstract
The present invention provides a kind of bridge-type DC converters, including inversion unit, transformer and rectification unit, inversion unit is connected to the primary side of transformer, rectification unit is connected to the secondary side of transformer, bridge-type DC converter further includes active-clamp unit and control unit, active-clamp unit is connected between the positive output end of rectification unit and negative output terminal, and the transient voltage stress for the switching tube to rectification unit clamps, active-clamp unit includes clamp switch pipe and clamping capacitance, and clamping capacitance and clamp switch pipe are sequentially connected in series between the positive output end and negative output terminal on rectification unit pair side；Control unit is connected to the control terminal of clamp switch pipe, and the level signal turned on and off is exported to clamp switch pipe.Bridge-type DC converter provided by the invention, active-clamp unit realize low side by using PMOS and drive, and without additional configuration flash driving circuit, reduce technical difficulty, have been significantly reduced design cost.
Description
Technical field
The present embodiments relate to field of switch power, more specifically to a kind of bridge-type DC converter.
Background technique
Isolated form bridge rectifier topology is extensive in high power switching power supply, low-voltage, high-current applications.In vehicle power supply
Field, because its topology is simple and reliable, technical principle is mature, function admirable due to by favor.
Unavoidably there is leakage inductance, secondary side due to main transformer in isolated form bridge type topology (canonical topology is full-bridge converter)
Synchronous rectification MOS (abbreviation of MOSFET, MOSFET, Metal-Oxide-Semiconductor Field-Effect
Transistor, metal-oxide semiconductor fieldeffect transistor) also unavoidably there is junction capacity, it is open-minded in primary side MOS
Moment, primary side leakage inductance and secondary side MOS junction capacity resonance form very high resonance spikes in secondary side MOS junction capacity, are such as not added
Processing, it will challenge is constituted to the tolerable voltage stress of secondary side MOS.
About in the disposition of secondary side stress, currently the technology of mainstream mainly has passive RCD (resistance-capacitance-diode) in the industry
Clamp and active-clamp technology.
Passive RCD clamps the stress method of disposal as a kind of classics, and circuit letter is worked as reliably, low in cost；But it is right
The clamp effect of stress is not so good as flexibly control the active-clamp technology on clamp opportunity.
Bridge type topology disposes the active-clamp technology of secondary side stress, can debug situation, flexible configuration according to actual circuit
The switch opportunity of clamper tube, and obtain optimal stress disposition.Generally, traditional active clamping circuir is by a NMOS (N-type
MOSFET, N-Metal-Oxide-Semiconductor Field-Effect Transistor, NMOSFET, N-type metal-oxygen
Compound-semiconductor field effect transistor) and a capacitor it is in series.The source electrode of this kind of clamp structure NMOS connects in high pressure one
Side, driving circuit category flash driving, increases the complexity of control, brings difficulty to driving design；On hardware, also need to configure
Corresponding floating drive device, circuit, thus cost also needs to rise.
Summary of the invention
Technical problems to be solved of the embodiment of the present invention are, for above-mentioned in traditional bridge-type DC converter, pincers
The source electrode of bit architecture NMOS connects in high pressure side, and the driving of driving circuit category flash increases the complexity of control, gives driving design
Bring difficulty；On hardware, configuration corresponding floating drive device, circuit are also needed, thus cost also needs the problem of rising, to provide one kind
New bridge-type DC converter.
The technical solution that the embodiment of the present invention solves above-mentioned technical problem is to provide a kind of bridge-type DC converter, including
Inversion unit, transformer and rectification unit, the inversion unit are connected to the primary side of the transformer, the rectification unit connection
On the secondary side of the transformer, the bridge-type DC converter further includes active-clamp unit and control unit, the active pincers
Bit location is connected between the positive output end and negative output terminal of the rectification unit, and for the switching tube to the rectification unit
Transient voltage stress clamped, the active-clamp unit includes clamp switch pipe and clamping capacitance, and clamp electricity
Hold and the clamp switch pipe is sequentially connected in series between the positive output end and negative output terminal on rectification unit pair side；It is described
Control unit is connected to the control terminal of the clamp switch pipe, and opens the clamp switch pipe to clamp switch pipe output
Logical and shutdown level signal.
In bridge-type DC converter described in the embodiment of the present invention, the clamp switch pipe is PMOS tube, the PMOS
The source electrode of pipe is connected with the negative output terminal of the rectification unit, and the drain electrode of the PMOS tube is connected to institute via the clamping capacitance
The positive output end of rectification unit is stated, the grid of the PMOS tube is connected to described control unit, and it is defeated to receive described control unit
The level signal turned on and off out.
In bridge-type DC converter described in the embodiment of the present invention, described control unit is connected to the inversion unit
The control terminal of switching tube, and reach the first preset time period in the switching tube service time of the inversion unit and open the PMOS
Pipe, the second preset time period turns off the PMOS tube before the switching tube shutdown of the inversion unit.
In bridge-type DC converter described in the embodiment of the present invention, the active-clamp unit includes clamp diode,
The anode of the clamp diode connects the cathode of the clamping capacitance, and it is single that the cathode of the clamp diode connects the rectification
The negative output terminal of member.
In bridge-type DC converter described in the embodiment of the present invention, the active-clamp unit includes resistance, the electricity
Resistance is connected between the cathode of the clamping capacitance and the drain electrode of the PMOS tube.
In bridge-type DC converter described in the embodiment of the present invention, the inversion unit includes first switch tube, second
Switching tube, third switching tube and the 4th switching tube；Wherein, the first switch tube and second switch are connected in series in described inverse
Become between the positive input terminal and negative input end of unit, the third switching tube, the 4th switching tube are connected in series in the inversion list
Between the positive input terminal and negative input end of member；The positive input terminal of the primary side of the transformer is connected to the first switch tube and
The connecting node of two switching tubes, the negative input end of the primary side of the transformer are connected to the third switching tube and the 4th switching tube
Connecting node；
Described control unit is connected respectively to the first switch tube, second switch, third switching tube and the 4th opens
The control terminal of pipe is closed, and is opened respectively to the output of the first switch tube, second switch, third switching tube and the 4th switching tube
Logical and shutdown level signal.
In bridge-type DC converter described in the embodiment of the present invention, the rectification unit includes the 5th switching tube, the 6th
Switching tube, the 7th switching tube and the 8th switching tube；Wherein, the 5th switching tube and the 6th switching tube are connected in series in described whole
Between the positive output end and negative output terminal for flowing unit, the 7th switching tube and the 8th switching tube are connected in series in the rectification list
Between the positive output end and negative output terminal of member；The positive output end on the secondary side of the transformer is connected to the 5th switching tube and
The connecting node of six switching tubes, the negative output terminal on the secondary side of the transformer are connected to the 7th switching tube and the 8th switching tube
Connecting node；
Described control unit is connected respectively to the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th opens
The control terminal of pipe is closed, and is opened respectively to the output of the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube
Logical and shutdown level signal.
In bridge-type DC converter described in the embodiment of the present invention, in third preset time period, described control unit
Control the first switch tube and the conducting of the 4th switching tube, the second switch and the shutdown of third switching tube；Described 5th opens
Close pipe and the conducting of the 8th switching tube, the 6th switching tube and the shutdown of the 7th switching tube；The PMOS tube shutdown；And described
In three preset time periods, the clamp diode cut-off；
In the 4th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, institute
State second switch and the shutdown of third switching tube；5th switching tube and the 8th switching tube conducting, the 6th switching tube and
The shutdown of 7th switching tube；The PMOS tube shutdown；And in the 4th preset time period, the clamp diode conducting；
In the 5th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, institute
State second switch and the shutdown of third switching tube；5th switching tube and the 8th switching tube conducting, the 6th switching tube and
The shutdown of 7th switching tube；The PMOS tube conducting；And in the 5th preset time period, the clamp diode cut-off；
In the 6th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, institute
State second switch and the shutdown of third switching tube；5th switching tube and the 8th switching tube conducting, the 6th switching tube and
The shutdown of 7th switching tube；The PMOS tube conducting；And in the 6th preset time period, the clamp diode cut-off；
In the 7th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, institute
State second switch and the shutdown of third switching tube；5th switching tube and the 8th switching tube conducting, the 6th switching tube and
The shutdown of 7th switching tube；The PMOS tube shutdown；And in the 7th preset time period, the clamp diode cut-off；
In the 8th preset time period, described control unit controls the first switch tube and the shutdown of the 4th switching tube, institute
State second switch and the shutdown of third switching tube；5th switching tube and the 8th switching tube conducting, the 6th switching tube and
The conducting of 7th switching tube；The PMOS tube shutdown；And in the 8th preset time period, the clamp diode cut-off.
In bridge-type DC converter described in the embodiment of the present invention, the third preset time period, the 4th preset time
Section, the 5th preset time period, the 6th preset time period, the 7th preset time period are connected with the 8th preset time period sequence, and institute
Stating the first preset time period is the sum of the third preset time period and the 4th preset time period, and second preset time period is
7th preset time period.
Bridge-type DC converter provided in an embodiment of the present invention have following technical effect that active-clamp unit by using
PMOS tube realizes low side driving, without additional configuration flash driving circuit, reduces technical difficulty, has been significantly reduced and has set
Count cost.
Detailed description of the invention
Fig. 1 is the schematic diagram of bridge-type DC converter first embodiment provided by the invention；
Fig. 2 is the schematic diagram of bridge-type DC converter second embodiment provided by the invention；
Fig. 3 is the schematic diagram of bridge-type DC converter 3rd embodiment provided by the invention；
Fig. 4 is the typical Fa Bo time diagram of bridge-type DC converter provided by the invention；
Fig. 5 is 3rd embodiment circuit working state signal during 0-t0 of bridge-type DC converter provided by the invention
Figure；
Fig. 6 be bridge-type DC converter provided by the invention 3rd embodiment during t0-t1 circuit working state show
It is intended to；
Fig. 7 be bridge-type DC converter provided by the invention 3rd embodiment during t1-t2 circuit working state show
It is intended to；
Fig. 8 be bridge-type DC converter provided by the invention 3rd embodiment during t2-t4 circuit working state show
It is intended to；
Fig. 9 be bridge-type DC converter provided by the invention 3rd embodiment during t4-t5 circuit working state show
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, being the schematic diagram of bridge-type DC converter first embodiment provided by the invention, which becomes
Parallel operation is suitable for field of switch power, specifically includes inversion unit 1, transformer 2 and rectification unit 3, inversion unit 1 is connected to change
The primary side of depressor 2, rectification unit 3 are connected to the secondary side of transformer 2, and bridge-type DC converter provided in an embodiment of the present invention also wraps
Active-clamp unit 4 and control unit are included, which is connected to the positive output end and negative output terminal of rectification unit 3
Between, and the transient voltage stress for the switching tube to rectification unit 3 clamps.Above-mentioned active-clamp unit 4 specifically may be used
Including clamp switch pipe Q9 and clamping capacitance C, and clamping capacitance C and clamp switch pipe Q9 are sequentially connected in series in rectification unit 3
Between the positive output end and negative output terminal on secondary side, i.e. clamping capacitance C is connected to the positive output end on the secondary side of rectification unit 3, and clamp is opened
Close the negative output terminal that pipe Q9 is connected to the secondary side of rectification unit 3.Control unit is connected to the control terminal of clamp switch pipe Q9, and to pincers
Bit switch pipe Q9 exports the level signal for turning on and off clamp switch pipe Q9.
Specifically, above-mentioned clamp switch Guan Kewei PMOS (p-type MOSFET, P-Metal-Oxide-Semiconductor
Field-Effect Transistor, p-type metal-oxide semiconductor fieldeffect transistor) pipe Q9, the source of PMOS tube Q9
Pole is connected with the negative output terminal of rectification unit 3, and the drain electrode of PMOS tube Q9 is connected to the just defeated of rectification unit 3 via clamping capacitance C
Outlet, the grid of PMOS tube Q9 are connected to control unit, and the level signal of reception control unit output turned on and off.
Bridge-type DC converter provided in an embodiment of the present invention, active clamping circuir unit are realized by using PMOS
Low side driving reduces technical difficulty, has been significantly reduced design cost without additional configuration flash driving circuit.
The basic principle of bridge-type DC converter provided in an embodiment of the present invention is the stabilizing voltage characteristic pair using clamping capacitance C
The transient voltage stress of PMOS tube Q9 is clamped, and above-mentioned control unit is connected to the control terminal of the switching tube of inversion unit 1, and
Reach the first preset time period in the switching tube service time of inversion unit 1 and open PMOS tube Q9, in the switching tube of inversion unit 1
The second preset time period turns off PMOS tube Q9 before shutdown.The driving for clamping PMOS tube Q9 can flexible configuration according to the actual situation
Wave is sent out, basic purpose is to reduce secondary voltage stress, optimal hair wave mode can be determined by practical debugging, so that secondary voltage stress
It reaches optimal.
As shown in Fig. 2, being the schematic diagram of bridge-type DC converter second embodiment provided by the invention, above-mentioned active-clamp
Unit 4 may include clamp diode D, the cathode of the anode connection clamping capacitance C of clamp diode D, the yin of clamp diode D
The negative output terminal of pole connection rectification unit 3.In clamping capacitance C charging process, electric current walks outer clamp diode D simultaneously.
As shown in figure 3, being the schematic diagram of bridge-type DC converter 3rd embodiment provided by the invention；Above-mentioned active-clamp
Unit may include resistance R, and resistance R is connected between the drain electrode of cathode and PMOS tube Q9 of clamping capacitance C.The effect of resistance R
It is so that electric current is walked outer and clamp diode D in clamping capacitance C charging process.
In the embodiment of all of above bridge-type DC converter, above-mentioned inversion unit includes first switch tube Q1, second
Switching tube Q2, third switching tube Q3 and the 4th switching tube Q4, wherein first switch tube Q1 and second switch Q2 are connected in series in
Between the positive input terminal and negative input end of inversion unit 1, third switching tube Q3, the 4th switching tube Q4 are connected in series in inversion unit
Between 1 positive input terminal and negative input end；The positive input terminal of the primary side of transformer 2 is connected to first switch tube Q1 and second switch
The connecting node of pipe Q2, the negative input end of the primary side of transformer 2 are connected to the connection of third switching tube Q3 and the 4th switching tube Q4
Node.
Above-mentioned control unit is connected respectively to first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th
The control terminal of switching tube Q4, and respectively to first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th switching tube
Q4 exports the level signal turned on and off.
Above-mentioned rectification unit includes the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7 and the 8th switching tube Q8；
Wherein, the 5th switching tube Q5 and the 6th switching tube Q6 are connected in series between the positive output end and negative output terminal of rectification unit 3, the
Seven switching tube Q7 and the 8th switching tube Q8 are connected in series between the positive output end and negative output terminal of rectification unit 3；Transformer 2
The positive output end on secondary side is connected to the connecting node of the 5th switching tube Q5 and the 6th switching tube Q6, and bearing for the secondary side of transformer 2 is defeated
Outlet is connected to the connecting node of the 7th switching tube Q7 and the 8th switching tube Q8.
Above-mentioned control unit is connected respectively to the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7 and the 8th
The control terminal of switching tube Q8, and respectively to the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7 and the 8th switching tube
Q8 exports the level signal turned on and off.
In conjunction with Fig. 3, to work of the bridge-type DC converter 3rd embodiment provided by the invention in a switch periods
Principle is analyzed, it is assumed that circuit has been in stable state, in the charge path such as Fig. 3 of clamping capacitance C 1.: flowing through clamping capacitance C-
Clamp diode D；In the discharge path such as Fig. 3 of clamping capacitance C 2.: flowing through PMOS tube Q9-resistance R-clamping capacitance C.
Specifically, as shown in figure 4, being the typical Fa Bo time diagram of bridge-type DC converter provided by the invention: figure
In, vrect is the voltage stress of 3 switching tube of secondary side rectification unit；Vclamp is the voltage of clamping capacitance C；Iclamp is to flow through
The electric current of clamping capacitance C；Δ t1 is that the time that clamp PMOS tube Q9 delay primary side switch pipe is opened is (i.e. above-mentioned in inversion unit 1
Switching tube service time reach the first preset time period and open PMOS tube Q9)；Δ t2 shifts to an earlier date primary side for clamp PMOS tube Q9 and opens
Close the time of pipe shutdown (i.e. above-mentioned second preset time period before the switching tube shutdown of inversion unit 1 turns off PMOS tube Q9).
In third preset time period 0-t0: circuit working state is as shown in figure 5, above-mentioned control unit controls first switch
Pipe Q1 and the 4th switching tube Q4 conducting, second switch Q2 and third switching tube Q3 shutdown；The switch of 5th switching tube Q5 and the 8th
Pipe Q8 conducting, the 6th switching tube Q6 and the 7th switching tube Q7 shutdown；Secondary 3 switching tube of side rectification unit (such as metal-oxide-semiconductor) junction capacity is opened
Begin to charge, secondary side synchronous rectification unit 3MOS tube voltage vrect starts linear rise, but voltage reaches clamping capacitance on it
Before the voltage vclamp of C, clamp PMOS tube Q9 shutdown, clamp diode D keeps cut-off, and clamping capacitance C voltage vclamp is protected
Hold it is constant, clamp current iclamp be 0.
In the 4th preset time period t0-t1: circuit working state is as shown in fig. 6, control unit controls first switch tube
Q1 and the 4th switching tube Q4 conducting, second switch Q2 and third switching tube Q3 shutdown；5th switching tube Q5 and the 8th switching tube
Q8 conducting, the 6th switching tube Q6 and the 7th switching tube Q7 shutdown；Clamp PMOS tube Q9 shutdown；T0 moment, secondary side synchronous rectification list
First 3MOS tube voltage vrect reaches the voltage vclamp of clamping capacitance C, clamp diode D conducting, and clamping capacitance C is started to charge,
Voltage linear rises, and clamp current iclamp goes into circulation, and secondary side synchronous rectification unit 3MOS tube voltage vrect continues on linear
Rise (theoretically since clamping capacitance C is very big, the rate of rise can be gently very much, and waveform diagram is not drawn accurately, only illustrate).
In the 5th preset time period t1-t2: circuit working state is as shown in fig. 7, control unit controls first switch tube
Q1 and the 4th switching tube Q4 conducting, second switch Q2 and third switching tube Q3 shutdown；5th switching tube Q5 and the 8th switching tube
Q8 conducting, the 6th switching tube Q6 and the 7th switching tube Q7 shutdown；At the t1 moment, clamping capacitance C voltage vclamp, secondary side synchronize whole
Stream unit 3MOS tube voltage vrect reaches maximum, and clamp PMOS tube Q9 is open-minded at this time, clamp diode D cut-off, clamp current
It is reversed that iclamp starts zero passage, clamping capacitance C electric discharge, and clamping capacitance C voltage vclamp, pair side synchronous rectification unit 3MOS pipe are electric
The equal linear decline of vrect is pressed, t2 moment, clamping capacitor voltage vclamp, secondary side synchronous rectification unit 3MOS tube voltage are reached
Vrect drops to steady state voltage stress, and again to 0, working condition of the clamp circuit within this period terminates clamp current.?
In 6th preset time period t2-t3, control unit controls first switch tube Q1 and the 4th switching tube Q4 conducting, second switch Q2
It is turned off with third switching tube Q3；5th switching tube Q5 and the 8th switching tube Q8 conducting, the 6th switching tube Q6 and the 7th switching tube Q7
Shutdown；Clamp the conducting of PMOS tube Q9 switching tube；And in the 6th preset time period, clamp diode D cut-off.
In the 7th preset time period t3-t4, control unit controls first switch tube Q1 and the 4th switching tube Q4 conducting, the
Two switching tube Q2 and third switching tube Q3 shutdown；5th switching tube Q5 and the 8th switching tube Q8 conducting, the 6th switching tube Q6 and the
Seven switching tube Q7 shutdown；Clamp PMOS tube Q9 shutdown；And in the 7th preset time period, clamp diode D cut-off.
In the 8th preset time period t4-t5, control unit controls first switch tube Q1 and the 4th switching tube Q4 shutdown, the
Two switching tube Q2 and third switching tube Q3 shutdown；5th switching tube Q5 and the 8th switching tube Q8 conducting, the 6th switching tube Q6 and the
Seven switching tube Q7 conducting；Clamp PMOS tube Q9 shutdown；And in the 8th preset time period, clamp diode D cut-off.
Above-mentioned third preset time period, the 4th preset time period, the 5th preset time period, the 6th preset time period, the 7th
Preset time period is connected with the 8th preset time period sequence, and above-mentioned first preset time period specifically can be third preset time
The sum of section and the 4th preset time period, the second preset time period can be the 7th preset time period.
Within the t2-t5 period: this time, active shown in circuit working state such as Fig. 8 (t2-t4), Fig. 9 (t4-t5)
Clamp units 4 do not work, and bridge-type DC converter works by normal condition, but should turn off PMOS in time at the t3 moment
Pipe Q9, it is ensured that before first switch tube Q1 and the 4th switching tube the Q4 shutdown of primary side inversion unit 1, PMOS tube Q9 is had been switched off,
Otherwise the risk that clamping capacitance C will have charge discharging resisting during afterflow causes clamp circuit operation irregularity.
It is summarized by upper principle Analysis, in the t0-t1 period, clamp diode D conducting, clamping capacitance C accesses circuit
It charges, secondary side rectification unit 3MOS tube voltage stress is clamped capacitor C voltage clamp；In the t1-t2 period, PMOS tube Q9
Conducting, discharges to clamping capacitance C, in this way, which under steady state operating conditions, clamping capacitance C realizes charge and discharge electric equilibrium automatically, protects
Demonstrate,prove clamp circuit reliability service.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (9)
1. a kind of bridge-type DC converter, including inversion unit, transformer and rectification unit, the inversion unit is connected to described
The primary side of transformer, the rectification unit are connected to the secondary side of the transformer, which is characterized in that the bridge-type DC converter
It further include active-clamp unit and control unit, the active-clamp unit is connected to the positive output end of the rectification unit and bears
Between output end, and the transient voltage stress for the switching tube to the rectification unit clamps, the active-clamp list
Member includes clamp switch pipe and clamping capacitance, and the clamping capacitance and the clamp switch pipe are sequentially connected in series described whole
Between the positive output end and negative output terminal for flowing unit pair side；Described control unit is connected to the control terminal of the clamp switch pipe,
And the level signal for turning on and off the clamp switch pipe is exported to the clamp switch pipe.
2. bridge-type DC converter according to claim 1, which is characterized in that the clamp switch pipe is PMOS tube, institute
The source electrode for stating PMOS tube is connected with the negative output terminal of the rectification unit, and the drain electrode of the PMOS tube connects via the clamping capacitance
It is connected to the positive output end of the rectification unit, the grid of the PMOS tube is connected to described control unit, and receives the control
The level signal of unit output turned on and off.
3. bridge-type DC converter according to claim 2, which is characterized in that described control unit is connected to the inversion
The control terminal of the switching tube of unit, and reach the first preset time period in the switching tube service time of the inversion unit and open institute
PMOS tube is stated, the second preset time period turns off the PMOS tube before the switching tube shutdown of the inversion unit.
4. bridge-type DC converter according to claim 3, which is characterized in that the active-clamp unit includes clamp two
Pole pipe, the anode of the clamp diode connect the cathode of the clamping capacitance, described in the cathode connection of the clamp diode
The negative output terminal of rectification unit.
5. bridge-type DC converter according to claim 4, which is characterized in that the active-clamp unit includes resistance,
The resistance is connected between the cathode of the clamping capacitance and the drain electrode of the PMOS tube.
6. bridge-type DC converter according to claim 5, which is characterized in that the inversion unit includes first switch
Pipe, second switch, third switching tube and the 4th switching tube；Wherein, the first switch tube and second switch are connected in series
Between the positive input terminal and negative input end of the inversion unit, the third switching tube, the 4th switching tube are connected in series in institute
It states between the positive input terminal of inversion unit and negative input end；The positive input terminal of the primary side of the transformer is connected to described first and opens
The connecting node of pipe and second switch is closed, the negative input end of the primary side of the transformer is connected to the third switching tube and the
The connecting node of four switching tubes；
Described control unit is connected respectively to the first switch tube, second switch, third switching tube and the 4th switching tube
Control terminal, and respectively to the first switch tube, second switch, third switching tube and the 4th switching tube output open and
The level signal of shutdown.
7. bridge-type DC converter according to claim 6, which is characterized in that the rectification unit includes the 5th switch
Pipe, the 6th switching tube, the 7th switching tube and the 8th switching tube；Wherein, the 5th switching tube and the 6th switching tube are connected in series
Between the positive output end and negative output terminal of the rectification unit, the 7th switching tube and the 8th switching tube are connected in series in institute
It states between the positive output end of rectification unit and negative output terminal；The positive output end on the secondary side of the transformer is connected to the described 5th and opens
The connecting node of pipe and the 6th switching tube is closed, the negative output terminal on the secondary side of the transformer is connected to the 7th switching tube and the
The connecting node of eight switching tubes；
Described control unit is connected respectively to the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube
Control terminal, and respectively to the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube output open and
The level signal of shutdown.
8. bridge-type DC converter according to claim 7, which is characterized in that in third preset time period, the control
Unit processed controls the first switch tube and the conducting of the 4th switching tube, the second switch and the shutdown of third switching tube；It is described
5th switching tube and the conducting of the 8th switching tube, the 6th switching tube and the shutdown of the 7th switching tube；The PMOS tube shutdown；And
In the third preset time period, the clamp diode cut-off；
In the 4th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, and described the
Two switching tubes and the shutdown of third switching tube；5th switching tube and the conducting of the 8th switching tube, the 6th switching tube and the 7th
Switching tube shutdown；The PMOS tube shutdown；And in the 4th preset time period, the clamp diode conducting；
In the 5th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, and described the
Two switching tubes and the shutdown of third switching tube；5th switching tube and the conducting of the 8th switching tube, the 6th switching tube and the 7th
Switching tube shutdown；The PMOS tube conducting；And in the 5th preset time period, the clamp diode cut-off；
In the 6th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, and described the
Two switching tubes and the shutdown of third switching tube；5th switching tube and the conducting of the 8th switching tube, the 6th switching tube and the 7th
Switching tube shutdown；The PMOS tube conducting；And in the 6th preset time period, the clamp diode cut-off；
In the 7th preset time period, described control unit controls the first switch tube and the conducting of the 4th switching tube, and described the
Two switching tubes and the shutdown of third switching tube；5th switching tube and the conducting of the 8th switching tube, the 6th switching tube and the 7th
Switching tube shutdown；The PMOS tube shutdown；And in the 7th preset time period, the clamp diode cut-off；
In the 8th preset time period, described control unit controls the first switch tube and the shutdown of the 4th switching tube, and described the
Two switching tubes and the shutdown of third switching tube；5th switching tube and the conducting of the 8th switching tube, the 6th switching tube and the 7th
Switching tube conducting；The PMOS tube shutdown；And in the 8th preset time period, the clamp diode cut-off.
9. bridge-type DC converter according to claim 8, which is characterized in that the third preset time period, the 4th are in advance
If period, the 5th preset time period, the 6th preset time period, the 7th preset time period and the 8th preset time period sequence phase
Even, and first preset time period is the sum of the third preset time period and the 4th preset time period, and described second is default
Period is the 7th preset time period.
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