CN104935173B - A kind of current source type full bridge PWM converter with auxiliary converter circuit - Google Patents
A kind of current source type full bridge PWM converter with auxiliary converter circuit Download PDFInfo
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- CN104935173B CN104935173B CN201510315603.5A CN201510315603A CN104935173B CN 104935173 B CN104935173 B CN 104935173B CN 201510315603 A CN201510315603 A CN 201510315603A CN 104935173 B CN104935173 B CN 104935173B
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Abstract
The present invention relates to a kind of current source type full bridge PWM converter with auxiliary converter circuit, including inverter circuit, resonant network, transformer, rectifying and wave-filtering network, also increase by two auxiliary branch, each auxiliary branch is made up of auxiliary transformer, auxiliary switch and electric capacity respectively, two auxiliary transformer primary sides are serially connected in two emitter stages of lagging leg, two auxiliary transformer secondary paralleling switch pipes and electric capacity；The shut-off conducting of two auxiliary switches of control, coordinates the change of current between four main switches.The present invention by adding two auxiliary branch respectively on the lagging leg of traditional current source type pwm converter, in the case of coordinating appropriate driving pulse, effectively solve the two large problems being primarily present in the type full bridge PWM converter of conventional current source, that is the change of current of lagging leg and duty-cycle loss problem, improves the operating efficiency of converter.
Description
Technical field
The present invention relates to electricity field, more particularly to the technology of power device switching loss is reduced, particularly one kind is with auxiliary
Help the current source type full bridge PWM converter of converter circuit.
Background technology
The PWM of full-bridge（Pulse Width Modulation）Converter is generally applied to high power D C-DC（Directly
Stream-direct current）In power conversion.But its life-span and efficiency are us focus on need concern two broad aspects.The shifting of voltage-source type
Phase full-bridge converter is operated in ZVS（Zero Voltage Switching）It is that the circuit being nowadays most widely used is opened up under state
One of flutter, simple structure is the advantage is that, and have good service behaviour, but in its circuit topology, DC side simultaneously connects
Big capacity electrolyte capacitor so that the basic pulse free of DC voltage, and the electric capacity also acts the effect of buffering quadergy, but
Because the working life of electrochemical capacitor ordinarily be about 10,000 hours, far below the desired working life of converter, thus turn into
The bottleneck that the restriction converter life-span further improves.But in the circuit topology of current source type full bridge PWM converter, be different from
Voltage-source type, the big inductance of its DC side series connection so that the basic pulse free of DC side electric current, and the big inductance also plays buffering nothing
The effect of function amount, due to having evaded the use of electrochemical capacitor, so as to extend the working life of converter；On the other hand, it is
The power density of converter is greatly improved, it is two main design sides to reduce power attenuation and improve switching frequency
To.But increasing switching frequency will necessarily increase the switching loss of device, therefore we need to subtract by way of Sofe Switch
The switching loss of gadget.Nowadays the phase-shifted full-bridge converter of voltage-source type is most widely used under being operated in ZVS states
One of soft switch topology, but ZVS is more suitable for such as MOSFET（Metal-Oxide-Semiconductor FET）One class is opened
Close device.And in the occasion of high-power, IGBT（Insulated-Gate Bipolar Transistor）Because of its current-carrying energy
Power is strong, conduction loss is low and acquirement is widely applied, but due to the tail currents existed when it is turned off, then can cause it in shut-off
When in the presence of turn-off power loss higher.Therefore under the occasion of high-power, the full bridge PWM converter of current source type is operated in
ZCS（Zero Current Switching）It is operated under ZVS states than the full-bridge circuit of voltage-source type under state and is more beneficial for
The efficiency of converter is improved, the output end of current source type full bridge PWM converter need not connect huge output inductor in addition,
The high frequency oscillation of commutation diode and resonant inductance is avoided, diode voltage stress problem high is reduced, this also causes electricity
The converter of stream source type is more suitably applied to the occasion of high-power compared to voltage-source type.
Traditional current source type full bridge PWM converter has that the change of current is difficult due to its lagging leg, therefore its electricity
The need for resonant capacitance then will meet the circuit change of current with the selection of resonant inductance in road, the duty-cycle loss for thus causing, conducting
The problems such as being lost excessive, Current Voltage stress is excessive also causes that the efficiency of traditional current source type full bridge PWM converter is subject to tight
Ghost image rings；Additionally due to the limitation of switching tube commutating mode so that traditional current source type full bridge PWM converter is for input electricity
The control of stream is extremely limited, and this also causes that it produces problems in actual applications.
The Qian Sun of Sichuan University propose a kind of electricity of the resonant capacitance energy-controllable determined by input current size
Stream source type full bridge PWM converter, as shown in figure 1, the converter is becoming on the basis of the code converter circuit topology of conventional current source
Depressor primary side seals in auxiliary network 100, and the auxiliary network is by two auxiliary switch S1、S2And resonant capacitanceC rParallel connection is constituted,
The characteristics of circuit topology is that the energy in resonant capacitance in the case that different electric currents are input into is also different so that in circuit loop
Resonant energy according to the different and different of working condition, on the one hand realize the ZCS of main switch, on the one hand reduce because humorous
The too high break-over of device that the energy that shakes is excessive and causes is lost, the working range expanded for additionally realizing converter ZCS.
But because the charge and discharge process of its resonant capacitance causes that the circuit topology is still present obvious duty-cycle loss problem so that
The efficiency of converter cannot be further improved.
The content of the invention
The present invention be directed to the problem that traditional current source type full bridge PWM converter is present, it is proposed that a kind of band auxiliary is changed
What is be primarily present in the current source type full bridge PWM converter of current circuit, effectively solution conventional current source type full bridge PWM converter is stagnant
The change of current of bridge arm and duty-cycle loss problem, improve the operating efficiency of converter afterwards.
The technical scheme is that：A kind of current source type full bridge PWM converter with auxiliary converter circuit, including inversion
Circuit, resonant network, transformer, rectifying and wave-filtering network, inverter circuit are used by power supplyV in, input inductanceL inOpened with four masters
Close pipe Q1、Q2、Q3、Q4The current source type full bridge inverter structure of composition, wherein main switch Q1And Q3Leading-bridge is constituted, it is main
Switching tube Q2And Q4Lagging leg is constituted, also including two auxiliary branch, the first auxiliary branch is by auxiliary transformer T1, auxiliary open
Close pipe S1And electric capacityC 1Constitute, auxiliary transformer T1Primary side is serially connected in lagging leg Q2Emitter stage, auxiliary transformer T1Secondary is simultaneously
Connection switching tube S1And electric capacityC 1；Second auxiliary branch is by auxiliary transformer T2, auxiliary switch S2And electric capacityC 2Constitute, auxiliary becomes
Depressor T2Primary side is serially connected in lagging leg Q4Emitter stage, auxiliary transformer T2Secondary paralleling switch pipe S2And electric capacityC 2；Control is opened
Close pipe S1And S2Shut-off conducting, coordinate four main switch Q1、Q2、Q3、Q4Between the change of current.
Electric capacity in the auxiliary branchC 1WithC 2It is thin-film capacitor, auxiliary switch S1And S2It is insulated gate bipolar brilliant
Body pipe IGBT, auxiliary switch S1In main switch Q2Open preceding open-minded, auxiliary switch S2In main switch Q4Opened before opening
It is logical.
The resonant network is by resonant inductance, resonant capacitance, electric capacityC 1And electric capacityC 2Constitute；Resonant inductance includes external
Resonant inductanceL rWith itself leakage inductance of transformer T；Resonant capacitance removes external resonant capacitanceC rOutward, also including output rectification two pole
Pipe D1、D2、D3、D4Distribution capacity between itself junction capacity and transformer T itself winding；Electric capacityC r、C 1WithC 2It is film
Electric capacity.
The rectifying and wave-filtering network is by 4 diode D1、D2、D3、D4With 1 output capacitanceCThe full-bridge rectification of composition
Filter structure.
The beneficial effects of the present invention are：The current source type full bridge PWM converter of base band auxiliary converter circuit of the present invention, leads to
Cross and add two auxiliary branch respectively on the lagging leg of traditional current source type pwm converter, coordinate appropriate driving arteries and veins
In the case of punching, the two large problems being primarily present in the type full bridge PWM converter of conventional current source, i.e. lagging leg are effectively solved
The change of current and duty-cycle loss problem, improve the operating efficiency of converter.
Brief description of the drawings
Fig. 1 is the variable soft switch circuit figure of the resonant energy based on current source type full bridge PWM converter；
Fig. 2 is the current source type full bridge PWM converter circuit figure with auxiliary converter circuit of the invention；
Fig. 3 to 7 is the current source type full bridge PWM converter day part process chart with auxiliary converter circuit of the invention；
Fig. 8 is the circuit working waveform figure of embodiment of the present invention.
Specific embodiment
The embodiment of the present invention by the circuit topology of traditional current source type full bridge PWM converter, to lagging leg
Auxiliary branch 200,201 is added respectively, so as to the change of current for being conducive to lagging leg is completed, is advantageously reduced original dutycycle and is lost
Lose, so as to improve the operating efficiency of converter；Meanwhile, this circuit topological structure and the course of work are simple, it is easy to accomplish.
The electricity of current source type full bridge PWM converter circuit of the present invention with auxiliary converter circuit, including inversion as shown in Figure 2
Road, resonant network, auxiliary branch, transformer and rectifying and wave-filtering network.
Inverter circuit is used by power supplyV in, input inductanceL inWith four main switch Q1、Q2、Q3、Q4The current source of composition
Type full bridge inverter structure, switching tube Q1、Q2、Q3、Q4It is insulated gate bipolar transistor IGBT, Q1And Q3Constitute advanced bridge
Arm, Q2And Q4Constitute lagging leg, four tunnel control signal driving switch pipe conductings of fixed frequency, leading-bridge Q1And Q3Drive
Moving pulse is complementary, lagging leg Q2And Q3Driving pulse it is complementary, the driving arteries and veins of the delayed leading-bridge of driving pulse of lagging leg
Certain hour is rushed, and driving pulse dutycycle is all higher than 50 percent, so as to complete the work of current source type full bridge inverter
Make situation；The resonant network is by resonant inductance, resonant capacitance, electric capacityC 1And electric capacityC 2Constitute；Resonant inductance includes external humorous
Shake inductanceL rWith itself leakage inductance of transformer T；Resonant capacitance removes external resonant capacitanceC rOutward, also including output commutation diode
D1、D2、D3、D4Distribution capacity between itself junction capacity and transformer T itself winding；Auxiliary branch includes the He of auxiliary branch 200
Auxiliary branch 201, wherein auxiliary branch 200 is by transformer T1, auxiliary switch S1And electric capacityC 1Constitute, transformer T1Primary side string
It is connected on lagging leg Q2Emitter stage, transformer T1Secondary paralleling switch pipe S1And electric capacityC 1；Auxiliary branch 201 is by transformer T2,
Auxiliary switch S2And electric capacityC 2Constitute, transformer T2Primary side is serially connected in lagging leg Q4Emitter stage, transformer T2Secondary is in parallel
Switching tube S2And electric capacityC 2；Transformer T1And T2It is made up of magnetic core, primary side winding and vice-side winding, core material selects soft magnet
Oxysome, primary and secondary side winding is by enamel-covered wire coiling；Electric capacityC 1WithC 2It is thin-film capacitor, auxiliary switch S1And S2It is
Insulated gate bipolar transistor IGBT；Transformer T is made up of magnetic core, primary side winding and vice-side winding, and core material selects soft magnet
Oxysome, primary side winding connects resonance circuit and inverter circuit by enamel-covered wire coiling, and vice-side winding is connected whole by enamel-covered wire coiling
Stream filter circuit；Rectifying and wave-filtering network is by 4 diode D1、D2、D3、D4With 1 output capacitanceCThe full-bridge rectification filter of composition
Wave structure, the secondary of the input connection transformer T of the rectifying and wave-filtering network, output connection output loadingR 。
Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are the current source type full bridge PWM converter with auxiliary converter circuit in half period
The interior course of work, Fig. 8 is the working waveform figure of the auxiliary converter circuit of current source type full bridge PWM converter：
t
0Reference picture 3 before moment, transformer T primary circuit breaker in middle pipes Q1And Q4Conducting, auxiliary switch S1It is in
Shut-off, auxiliary switch S2It is on, commutation diode D in secondary circuit2And D3Conducting, energy is transmitted to secondary；
t
0 , t 1Reference picture 4,t 0Moment switching tube Q3It is open-minded, open the commutation course of leading-bridge, transformation during this
Device T primary circuit breaker in middle pipes Q1、Q3And Q4The conducting change of current, auxiliary switch S1Maintain shut-off, auxiliary switch S2Maintain conducting；
Commutation diode D in secondary circuit2And D3Conducting.Flow through switching tube Q1Electric current to switching tube Q3The change of current so that switching tube Q1
Turned off under the conditions of ZCS, during this period, energy is still transmitted to secondary.
t
1 , t 2Reference picture 5,t 1Moment switching tube Q1With auxiliary switch S2Shut-off, transformer T primary sides electricity during this
Road breaker in middle pipe Q3And Q4Conducting afterflow, primary voltage of transformer is zero, flows through switching tube Q3And Q4Electric current pass through transformer T2
To electric capacityC 2Charge, auxiliary switch S1It is open-minded；Four commutation diode D in secondary circuit1、D2、D3And D4It is both turned on afterflow,
Transformer secondary voltage is zero, and output capacitance voltage maintains output voltage.
t
2 , t 3Reference picture 6,t 2Moment switching tube Q2It is open-minded, open the commutation course of lagging leg, transformation during this
Device T primary circuit breaker in middle pipes Q2、Q3And Q4The conducting change of current, auxiliary switch S1Maintain conducting, auxiliary switch S2Maintain shut-off；
Commutation diode D in secondary circuit1And D4Conducting.The electric capacity in auxiliary branchC 2In the presence of complete electric current by switching tube Q4To
Q2Commutation course so that switching tube Q4Turned off under the conditions of ZCS, resonant inductanceL rElectric current is reverse, resonant capacitanceC rVoltage is anti-
To；
t
3 , t 4Reference picture 7,t 3Moment switching tube Q4Shut-off, transformer T primary circuits breaker in middle pipe Q during this2With
Q3Conducting, auxiliary switch S1Maintain conducting, auxiliary switch S2Maintain shut-off；Commutation diode D in secondary circuit1And D4Lead
Logical, energy is transmitted to secondary.So far the course of work in circuit upper half cycle terminates, the course of work in open circuit lower half cycle,
Because the course of work in circuit lower half cycle is similar with the upper half cycle, therefore herein will for the course of work in circuit lower half cycle
Repeat no more；And auxiliary switch S1In switching tube Q3Turned off during shut-off, auxiliary switch S2In switching tube Q4Open preceding pass
It is disconnected.
It is the working waveform figure of the current source type full bridge PWM converter with auxiliary converter circuit in Fig. 8, from top to bottom successively
It is switching tube Q1Drive waveforms, switching tube Q2Drive waveforms, switching tube Q3Drive waveforms, switching tube Q4Drive waveforms,
Auxiliary switch S1Drive waveforms, auxiliary switch S2Drive waveforms, resonant inductanceL rCurrent waveform, auxiliary switch
S2Collector current waveform, electric capacityC 2Current waveform, resonant capacitanceC rVoltage waveform, electric capacityC 2Both end voltage waveform,
Switching tube Q3Collector current waveform, switching tube Q4Collector current waveform, switching tube Q3Colelctor electrode and emitter stage two ends
Voltage waveform and switching tube Q4Colelctor electrode and emitter stage both end voltage waveform.
Transformer T in the auxiliary branch of present invention design1And T2The turn ratio number of former secondary can as needed and actual conditions
Carrying out a certain degree of adjustment enables auxiliary branch preferably to work in varied situations, i.e., by adjusting transformer T1And T2
Turn ratio number on the one hand meet electric capacity in auxiliary branchC 1OrC 2The requirement of charging, to reach the work of lagging leg assist exchanging circuit
With one side improves auxiliary switch S in auxiliary branch as far as possible1And S2Current Voltage value when shut-off is opened, to meet
Reduce auxiliary switch S on the premise of the change of current1And S2Loss.
Present invention design due to adding auxiliary branch respectively in lagging leg so that bridge arm Q afterwards2And Q3Carry out the change of current open-minded
When, due to electric capacity in auxiliary branchC 1WithC 2Presence so that lagging leg is easy to the change of current, and effectively reduces resonant capacitanceC rThe size of value so that original serious duty-cycle loss problem is resolved, and improves the operating efficiency of converter；Meanwhile,
Because this circuit topological structure is simple, each side parameter has certain flexibility in circuit, it is easy to control and realization.
Claims (4)
1. a kind of current source type full bridge PWM converter with auxiliary converter circuit, including inverter circuit, resonant network, transformer,
Rectifying and wave-filtering network, inverter circuit is used by power supply Vin, input inductance LinWith four main switch Q1、Q2、Q3、Q4The electricity of composition
Stream source type full bridge inverter structure, wherein main switch Q1And Q3Constitute leading-bridge, main switch Q2And Q4Constitute delayed bridge
Arm, it is characterised in that also including two auxiliary branch, the first auxiliary branch is by auxiliary transformer T1, auxiliary switch S1And electric capacity
C1Constitute, auxiliary transformer T1Primary side is serially connected in lagging leg Q2Emitter stage, auxiliary transformer T1Secondary paralleling switch pipe S1With
Electric capacity C1；Second auxiliary branch is by auxiliary transformer T2, auxiliary switch S2With electric capacity C2Constitute, auxiliary transformer T2Primary side is concatenated
In lagging leg Q4Emitter stage, auxiliary transformer T2Secondary paralleling switch pipe S2With electric capacity C2；Controlling switch pipe S1And S2Pass
Disconnected conducting, coordinates four main switch Q1、Q2、Q3、Q4Between the change of current.
2. a kind of current source type full bridge PWM converter with auxiliary converter circuit according to claim 1, its feature exists
In electric capacity C in the auxiliary branch1And C2It is thin-film capacitor, auxiliary switch S1And S2It is igbt
IGBT, auxiliary switch S1In main switch Q2Open preceding open-minded, auxiliary switch S2In main switch Q4Open preceding open-minded.
3. a kind of current source type full bridge PWM converter with auxiliary converter circuit according to claim 2, its feature exists
In the resonant network is by resonant inductance, resonant capacitance, electric capacity C1With electric capacity C2Constitute；Resonant inductance includes external resonant inductance
LrWith transformer itself leakage inductance；Resonant capacitance removes external resonant capacitance CrOutward, also including output commutation diode D1、D2、D3、D4
Distribution capacity between junction capacity and transformer itself winding of itself；Electric capacity Cr、C1And C2It is thin-film capacitor.
4. a kind of current source type full bridge PWM converter with auxiliary converter circuit according to claim 3, its feature exists
In the rectifying and wave-filtering network is by 4 diode D1、D2、D3、D4The full-bridge rectifier filter knot constituted with 1 output capacitance C
Structure.
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| CN201510315603.5A CN104935173B (en) | 2015-06-10 | 2015-06-10 | A kind of current source type full bridge PWM converter with auxiliary converter circuit |
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| CN104935173B true CN104935173B (en) | 2017-05-31 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107294217A (en) * | 2017-06-26 | 2017-10-24 | 西安电子科技大学 | A kind of non-contact type apparatus for transmitting electric energy |
| CN110931465B (en) * | 2018-09-20 | 2024-04-12 | 全球能源互联网研究院有限公司 | Device for restraining transition time oscillation of crimping IGBT device |
| CN112436733B (en) * | 2020-11-13 | 2023-01-03 | 燕山大学 | Three-phase resonant topology capable of reducing duty cycle loss and auxiliary switch modulation method thereof |
| CN114285286B (en) * | 2021-09-24 | 2023-09-01 | 中南大学 | Single-stage zero-current switching full-bridge boost direct-current converter and control method thereof |
| CN116780909B (en) * | 2023-08-17 | 2023-11-14 | 希荻微电子集团股份有限公司 | Voltage conversion circuit and electronic equipment |
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| CN101088213A (en) * | 2005-12-14 | 2007-12-12 | 东芝三菱电机产业系统株式会社 | Power converter |
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Address after: Xi'an City, Shaanxi province Taibai Road 710071 No. 2 Patentee after: XIDIAN University Patentee after: SHANGHAI CHINESE CAR RIBERD INTELLIGENT SYSTEM Co.,Ltd. Address before: Xi'an City, Shaanxi province Taibai Road 710071 No. 2 Patentee before: XIDIAN University Patentee before: SHANGHAI RUIBODE INTELLIGENT SYSTEMS Co.,Ltd. |