CN108183603B - A kind of single-stage is without bridge Sofe Switch resonance isolated form circuit of power factor correction - Google Patents

A kind of single-stage is without bridge Sofe Switch resonance isolated form circuit of power factor correction Download PDF

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CN108183603B
CN108183603B CN201711100466.9A CN201711100466A CN108183603B CN 108183603 B CN108183603 B CN 108183603B CN 201711100466 A CN201711100466 A CN 201711100466A CN 108183603 B CN108183603 B CN 108183603B
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switch tube
capacitor
secondary side
input
voltage
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CN108183603A (en
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张志�
康丽
张兆云
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Dongguan University of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

本发明公开了一种无桥软开关谐振隔离型功率因数校正电路及其控制方法，属于电力电子技术领域。功率因数校正电路，包括无桥输入端，所述无桥输入端包括输入电感、第一开关管、第二开关管、第一寄生电容、第二寄生电容、第一整流二极管、第二整流二极管、第一反并联二极管、第二反并联二极管，功率因数校正电路还包括第三开关管、钳位电容、第三反并联二极管、谐振电感、原边电容、隔离变压器、副边电容、副边整流桥、输出电容；在一个开关周期内，采用有源钳位技术，实现主开关管和辅开关管的零电压开通。本发明的电路和控制方法，具有能实现输入输出电压隔离、所需元器件少、转换效率高、控制简单和功率因数高等优点。

The invention discloses a bridgeless soft switch resonance isolation type power factor correction circuit and a control method thereof, belonging to the technical field of power electronics. A power factor correction circuit includes a bridgeless input end, the bridgeless input end includes an input inductor, a first switch tube, a second switch tube, a first parasitic capacitance, a second parasitic capacitance, a first rectifier diode, and a second rectifier diode , the first anti-parallel diode, the second anti-parallel diode, the power factor correction circuit also includes a third switch tube, a clamping capacitor, a third anti-parallel diode, a resonant inductor, a primary side capacitor, an isolation transformer, a secondary side capacitor, and a secondary side Rectifier bridge, output capacitor; in one switching cycle, the active clamping technology is used to realize zero-voltage turn-on of the main switch tube and the auxiliary switch tube. The circuit and the control method of the present invention have the advantages of realizing the isolation of input and output voltage, few components required, high conversion efficiency, simple control and high power factor.

Description

A kind of single-stage is without bridge Sofe Switch resonance isolated form circuit of power factor correction
Technical field
Present invention relates particularly to a kind of single-stages without bridge Sofe Switch resonance isolated form circuit of power factor correction and its controlling party Method belongs to power electronics field.
Background technique
It is increasingly severe to the harmonic pollution of electric system with the extensive use of power electronic equipment.Exploitation is efficient Rate, the converter topology of High Power Factor and its control mode have become research hotspot.Tradition isolated form power factor school at present Positive circuit uses two-stage topology scheme.Prime uses low frequency diode rectification, and combines DC-DC(direct current inversion of direct current) realize power Factor correcting, rear class use high-frequency isolation DC-DC scheme, realize that voltage is adjusted, and due to using two-level configuration, and input terminal uses Diode rectification is not controlled, that there are components is more, the low disadvantages such as low with input power factor of transfer efficiency.
Summary of the invention
Therefore, the present invention is directed to above-mentioned deficiency in the prior art, proposes a kind of novel unipolar alternate isolation scheme.
Specifically, the present invention provides a kind of no bridge Sofe Switch resonance isolated form circuit of power factor correction, including without bridge Input terminal, the no bridge input terminal include input inductance, first switch tube, second switch, the first parasitic capacitance, the second parasitism Capacitor, the first rectifier diode, the second rectifier diode, the first anti-paralleled diode, the second anti-paralleled diode, the no bridge Sofe Switch resonance isolated form circuit of power factor correction further includes third switching tube, clamp capacitor, third anti-paralleled diode, humorous Shake inductance, primary side capacitor, isolating transformer, secondary rectifier bridge, output capacitance in capacitor, pair；
It inputs inductance one end and connects input terminal positive pole, the input inductance other end is connected to the emitter of first switch tube Between the collector of second switch, input terminal power cathode is connected to anode and the second rectification two of the first rectifier diode Between the cathode of pole pipe, the collector of first switch tube is sequentially connected the hair of the cathode of the first rectifier diode, third switching tube Emitter-base bandgap grading and primary side capacitor, resonant inductance are connected between primary side capacitor and isolating transformer, and the emitter of second switch is successively Connect the anode of the second rectifier diode, clamp capacitor cathode, isolating transformer primary side the other end, the current collection of third switching tube Pole connects the anode of clamp capacitor, and the first parasitic capacitance, the first anti-paralleled diode are connected in parallel on the collector of first switch tube Between emitter, the second parasitic capacitance, the second anti-paralleled diode are connected in parallel on the collector and emitter of second switch Between, third anti-paralleled diode is connected in parallel between the collector and emitter of third switching tube, and secondary side rectifier bridge one end passes through Secondary side capacitance connection transformer secondary, the secondary side rectifier bridge other end connect output capacitance.
Further, the secondary side rectifier bridge includes the full bridge rectifier of four input rectifying diodes composition.
The present invention also provides a kind of based on a kind of above-mentioned no bridge Sofe Switch resonance isolated form circuit of power factor correction Soft switching control method, the control method realized by controlling switching tube turn-on and turn-off within the duty cycle, the work It is specifically included as the period:
First stage:
First switch tube and the conducting of the second main switch, the shutdown of third switching tube, input inductive current is linearly increasing, resonance Inductive current increases, but its direction is negative, and resonant capacitor voltage increases, and isolating transformer secondary current is negative, secondary side capacitor electricity Pressure reduces, and resonant inductance electric current progressively increases to zero by negative value, charges to output capacitance, and output voltage increases；
Second stage:
First switch tube and main switch are held on, and third switching tube is held off, and input inductive current keeps line Property increase, resonant inductance electric current is become just by negative, and primary side capacitor starts to discharge, and primary side capacitance voltage starts to reduce, isolating transformer Secondary current is become just by negative, and secondary side capacitor starts to charge, and secondary side capacitance voltage increases, and output capacitance voltage increases；
Phase III:
First switch tube and second switch are begun to turn off, and third switching tube is held off, and input inductive current initial Property reduce, resonant inductance electric current also starts to reduce, but is still positive value.Inductive current is inputted to the second parasitism of second switch Capacitor charging, the second parasitic capacitor voltage start to increase.Secondary current remains positive value, and gives secondary side capacitor charging, secondary side electricity Hold voltage to increase, the third anti-paralleled diode of third switching tube is begun to turn on, and starts to charge to clamp capacitor；
Fourth stage:
First switch tube and second switch are held off, and third switching tube is open-minded, and input inductive current holding linearly subtracts Small, resonant inductance electric current starts by reducing, but direction is positive, until being reduced to zero, secondary current keeps positive value and to secondary side electricity Capacity charge, secondary side capacitance voltage increase, and output capacitance voltage increases, until resonant inductance electric current is reduced to zero；
5th stage:
First switch tube and second switch shutdown, third switching tube is open-minded, and resonant inductance electric current starts by zero reversed increasing Add, clamp capacitor starts to discharge.Secondary current starts reversely to become negative value, and secondary side capacitance voltage reduces, and input inductive current is protected Hold linear reduction；
6th stage:
The shutdown of third switching tube, resonant inductance electric current start to reduce, and direction is negative, the energy stored in resonant inductance at this time Greater than the energy of the second parasitic capacitance storage, the second parasitic capacitor voltage will be discharged to zero, and first switch tube, second open at this time The anti-paralleled diode conducting for closing pipe, if opening first switch tube, second switch at this time, first switch tube, second switch Pipe is in no-voltage opening state, another period starts.
The beneficial effects of the present invention are: a kind of single-stage provided by the invention is without bridge Sofe Switch resonance isolated form power factor Correcting circuit, Two Stages scheme compared with the prior art realize function in conjunction with soft switch technique using no bridge topological structure Rate factor correcting (Power Factor Correction, PFC), input and output voltage isolation and adjusting output voltage, due to Its single step arrangement and merely through level-one power conversion, there is simple high conversion efficiency, control, low cost and Harmonics of Input to contain Measure the advantages that low and power factor is high.
Detailed description of the invention
Fig. 1 is a kind of circuit topology figure of no bridge Sofe Switch resonance isolated form circuit of power factor correction of the present invention；
Fig. 2 is a kind of present invention complete period of the control method of no bridge Sofe Switch resonance isolated form circuit of power factor correction Schematic diagram；
Fig. 3 is the equivalent circuit diagram of first stage；
Fig. 4 is the equivalent circuit diagram of second stage；
Fig. 5 is the equivalent circuit diagram of phase III；
Fig. 6 is the equivalent circuit diagram of fourth stage；
Fig. 7 is the equivalent circuit diagram in the 5th stage；
Fig. 8 is the equivalent circuit diagram in the 6th stage；
Fig. 9 a, Fig. 9 b are respectively the drive waveforms and voltage stress waveform diagram of main switch and auxiliary switch pipe；
When Figure 10 is that input voltage is respectively 220V, when output power is from zero load to fully loaded (1000W), the conversion of converter Efficiency chart；
When Figure 11 is that input voltage is respectively 220V, for output power from zero load to full load when (1000W), input current is humorous Wave contains spirogram.
Specific embodiment
Description of specific embodiments of the present invention with reference to the accompanying drawing:
The present embodiment proposes a kind of single-stage isolated scheme.Input is realized in conjunction with soft switch technique using no bridge topological structure Output voltage isolation, PFC (Power Factor Correction, PFC) and adjusting output voltage.Circuit is opened up It flutters as shown in Figure 1.
Main circuit part, which uses, is based on resonance isolated soft switching scheme.By input rectifying diode D1、D2And switching tube S1、S2Composition without bridge input terminal, auxiliary switch pipe S3, boost inductance L, power tube parasitic capacitance Cr, clamp capacitor CC, high-frequency isolation Transformer T1, resonant inductance Lr, primary side capacitor CP, pair side capacitor CSWith rectifier diode D3、 D4、D5And D6, output capacitance CoStructure At.Define S1And S2For main switch, S3Supplemented by switching tube.Wherein, S1And S2Driving signal it is identical.Supervisor and auxiliary pipe are according to mutual Benefit opens mode and works, and the ZVS no-voltage conducting of three switching tubes may be implemented.Resonant inductance LrWith primary side capacitor CPIt constitutes humorous Shake circuit, and resonance frequency can be greater than, be less than or equal to switching frequency.For the ease of analysis, resonance frequency is higher than with switching frequency It is analyzed for rate, while only analyzing working condition when AC-input voltage is positive half period, input voltage is negative half period Phase is similar.Six stages are divided to be analyzed below, complete period schematic diagram uses as shown in Fig. 2, in a switch periods Active clamp technology realizes that the no-voltage of main switch and auxiliary switch pipe is open-minded.Circuit and control method of the invention has energy It realizes few input and output voltage isolation, required component, high conversion efficiency, control the advantages that simple and power factor is high.
First stage (t0-t1):
t0Moment, main switch S1And S2Conducting, auxiliary switch pipe S3Shutdown.Input inductive current isIt is linearly increasing, resonance electricity Inducing current iLrIncrease, but its direction is negative, resonant capacitor voltage UCpIncrease.Transformer secondary side current isecIt is negative, capacitance voltage UCsReduce.And zero is gradually become, and give output capacitance CoutCharging, and voltage UoutIncrease.Diode D3And D6Conducting.
Transformer primary side forms two circuits.Power supply UsAnode, inductance L, switching tube S1, capacitor CP, inductance Lr, diode D2 With power supply UsNegative terminal forming circuit 1.Switching tube S1, capacitor CP, inductance Lr, switching tube S2Forming circuit 2.Its equivalent circuit diagram is as schemed Shown in 3.This state is continued until t1Moment, resonant inductance electric current iLrIncrease to zero.
Second stage (t1-t2):
t1Moment, main switch S1And S2It is held on, auxiliary switch pipe S3It is held off, inputs inductive current isKeep linear Increase.Resonant inductance electric current iLrBecome just by negative, capacitor CpStart to discharge, resonant capacitor voltage UCpStart to reduce.Transformer secondary Electric current is become just by negative, secondary side diode D4、D5Conducting, capacitor CSIt starts to charge, capacitance voltage UCsIt increases, output capacitance voltage Uout It increases.
Voltage device primary side forms two circuits.Power supply Us anode, inductance L, switching tube S2, diode D2With power supply Us negative terminal Forming circuit 1.Switching tube S1, capacitor CP, inductance Lr, switching tube S2Forming circuit 2.Its equivalent circuit diagram is as shown in Figure 4.
Phase III (t2-t3):
t2Moment, main switch S1And S2It begins to turn off, auxiliary switch pipe S3It is held off.Input inductive current isStart linear Reduce, resonant inductance electric current iLrAlso start to reduce, but be still positive value.Inductive current isGive main switch S2Parasitic capacitance Cr2It fills Electricity, capacitance voltage UCrStart to increase.Secondary side diode D4And D5Constantly on, capacitor Cs keeps charging, capacitance voltage UCsIncrease. Auxiliary pipe S3Parasitic diode is begun to turn on, and starts to give clamp capacitor CcCharging.This process time is shorter, in the process input electricity Inducing current isSize is held essentially constant.
Transformer primary side forms three circuits.Power supply Us anode, inductance L, switching tube S1, clamp capacitor CC, diode D2With Power supply Us negative terminal forming circuit 1.Power supply Us anode, inductance L, switching tube S2, diode D2With power supply Us negative terminal forming circuit 2.It opens Close pipe S3, capacitor CP, inductance Lr, clamp capacitor CCForming circuit 3.Its equivalent circuit diagram is as shown in Figure 5.
Fourth stage (t3-t4):
t3Moment, main switch S1And S2It is held off, auxiliary switch pipe S3It is open-minded.Input inductive current isHolding linearly subtracts It is small.Resonant inductance electric current iLrStart by reducing, but direction is positive, arrives t4Moment is reduced to zero.Secondary side diode D4And D5Holding is led It is logical, and charge to capacitor Cs, capacitance voltage UCsIncrease, output capacitance voltage UoutIncrease.Until t4Moment, resonant inductance electric current iLrIt is reduced to zero.
Transformer primary side forms two circuits.Power supply Us anode, inductance L, switching tube S1, clamp capacitor CC, diode D2With Power supply Us negative terminal forming circuit 1.Switching tube S3, capacitor CP, inductance Lr, clamp capacitor CCForming circuit 2.Due to auxiliary switch pipe S3's Anti-paralleled diode has been turned on, and auxiliary switch pipe is in no-voltage (ZVS) opening state.Its equivalent circuit diagram is as shown in Figure 6.
5th stage (t4-t5):
t4Moment, main switch S1And S2Shutdown, auxiliary switch pipe S3It is open-minded.Resonant inductance electric current iLrStart by zero reversed increasing Add, clamp capacitor CCStart to discharge.Secondary side diode D3And D6Conducting, capacitance voltage UCsReduce.Input inductive current isKeep line Property reduce.
Transformer primary side forms two circuits.Power supply Us anode, inductance L, switching tube S1, capacitor Cp, inductance Lr, diode D2With power supply Us negative terminal forming circuit 1.Switching tube S3, capacitor CP, inductance Lr, clamp capacitor CCForming circuit 2.Its equivalent circuit diagram As shown in Figure 7.
6th stage (t5-t6):
t5Moment, auxiliary switch pipe S3Shutdown.Resonant inductance electric current iLrStart to reduce, direction is negative.Assuming that resonant inductance LrIn The energy of storage is greater than parasitic capacitance Cr2The energy of storage, parasitic capacitor voltage will be discharged to zero, at this time main switch S2's Anti-paralleled diode conducting.If opening main switch at this time, supervisor is in no-voltage opening state.t6Moment opens S1And S2, Another period starts.
Transformer primary side forms two circuits.Power supply UsAnode, inductance L, switching tube S1, capacitor Cp, inductance Lr, diode D2 With power supply UsNegative terminal forming circuit 1.Switching tube S1, capacitor Cp, inductance Lr, switching tube S2Forming circuit 2.Its equivalent circuit diagram is as schemed Shown in 8.
According to the above technical scheme, 1KW model machine has been built.Parameter is as follows: transformer primary side and pair side turn ratio 8:12, inductance L=0.5mH, switching tube S1、S2And S3Working frequency 85KHz, capacitor Cp=4uF, inductance Lr=5uH, capacitor Cs=2.2uF.
When input voltage is positive half period, Fig. 9 is switching tube drive waveforms and voltage stress waveform.Fig. 9 a is main switch Pipe S2Driving and voltage stress waveform, switching tube S supplemented by Fig. 9 b3Driving and voltage stress waveform, as seen from the figure, power tube is open-minded When, switching tube drain-source voltage is in no-voltage opening state close to zero.Due to switching tube S1In positive half period, inverse parallel two Pole pipe is in the conductive state, so being also at no-voltage opening state.Input voltage is that negative half-cycle situation is similar.
When Figure 10 is that input voltage is respectively 220V, output power from zero load to fully loaded (1000W), imitate by the conversion of converter Rate figure, as seen from the figure, peak efficiency reaches 95.2%.
When Figure 11 is that input voltage is respectively 220V, for output power from zero load to full load when (1000W), input current is abnormal Variability, as shown in Figure 11, input current abnormality rate minimum 3.1%.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (1)

1.一种无桥软开关谐振隔离型功率因数校正电路控制方法，功率因数校正电路包括无桥输入端，所述无桥输入端包括输入电感、第一开关管、第二开关管、第一寄生电容、第二寄生电容、第一整流二极管、第二整流二极管、第一反并联二极管、第二反并联二极管，所述无桥软开关谐振隔离型功率因数校正电路还包括第三开关管、钳位电容、第三反并联二极管、谐振电感、原边电容、隔离变压器、副边电容、副边整流桥、输出电容；1. A bridgeless soft-switching resonance isolation type power factor correction circuit control method, the power factor correction circuit comprises a bridgeless input terminal, and the bridgeless input terminal comprises an input inductor, a first switch tube, a second switch tube, a first Parasitic capacitance, second parasitic capacitance, first rectifier diode, second rectifier diode, first anti-parallel diode, second anti-parallel diode, the bridgeless soft-switching resonance isolation type power factor correction circuit further includes a third switch tube, Clamping capacitor, third anti-parallel diode, resonant inductor, primary capacitor, isolation transformer, secondary capacitor, secondary rectifier bridge, output capacitor; 输入电感一端连接输入端电源正极，输入电感另一端连接在第一开关管的发射极与第二开关管的集电极之间，输入端电源负极连接在第一整流二极管的阳极与第二整流二极管的阴极之间，第一开关管的集电极依次连接第一整流二极管的阴极、第三开关管的发射极和原边电容，谐振电感连接在原边电容和隔离变压器之间，第二开关管的发射极依次连接第二整流二极管的阳极、钳位电容负极、隔离变压器原边的另一端，第三开关管的集电极连接钳位电容的正极，第一寄生电容、第一反并联二极管均并联在第一开关管的集电极和发射极之间，第二寄生电容、第二反并联二极管均并联在第二开关管的集电极和发射极之间，第三反并联二极管并联在第三开关管的集电极和发射极之间，副边整流桥一端通过副边电容连接变压器副边，副边整流桥另一端连接输出电容，其特征在于，所述控制方法通过在工作周期内控制开关管导通和关断来实现，所述工作周期具体包括：One end of the input inductor is connected to the positive pole of the input power supply, the other end of the input inductor is connected between the emitter of the first switch tube and the collector of the second switch tube, and the negative pole of the input power supply is connected to the anode of the first rectifier diode and the second rectifier diode. Between the cathodes of the first switch tube, the collector of the first switch tube is sequentially connected to the cathode of the first rectifier diode, the emitter of the third switch tube and the primary capacitor, the resonant inductance is connected between the primary capacitor and the isolation transformer, and the second switch tube The emitter is sequentially connected to the anode of the second rectifier diode, the cathode of the clamp capacitor, and the other end of the primary side of the isolation transformer, the collector of the third switch is connected to the anode of the clamp capacitor, and the first parasitic capacitor and the first anti-parallel diode are connected in parallel Between the collector and the emitter of the first switch tube, the second parasitic capacitor and the second anti-parallel diode are connected in parallel between the collector and the emitter of the second switch tube, and the third anti-parallel diode is connected in parallel with the third switch Between the collector and the emitter of the tube, one end of the secondary side rectifier bridge is connected to the secondary side of the transformer through the secondary side capacitor, and the other end of the secondary side rectifier bridge is connected to the output capacitor. Turn-on and turn-off are realized, and the duty cycle specifically includes: 第一阶段：The first stage: 第一开关管和第二主开关管导通，第三开关管关断，输入电感电流线性增加，谐振电感电流增加，但其方向为负，谐振电容电压增加，隔离变压器副边电流为负，副边电容电压减小，且谐振电感电流由负值逐渐增加到零，给输出电容充电，输出电压增加；The first switch tube and the second main switch tube are turned on, the third switch tube is turned off, the input inductor current increases linearly, the resonant inductor current increases, but its direction is negative, the resonant capacitor voltage increases, and the secondary side current of the isolation transformer is negative, The secondary capacitor voltage decreases, and the resonant inductor current gradually increases from a negative value to zero, charging the output capacitor, and the output voltage increases; 第二阶段：second stage: 第一开关管和第主开关管保持导通，第三开关管保持关断，输入电感电流保持线性增加，谐振电感电流由负变正，原边电容开始放电，原边电容电压开始减小，隔离变压器副边电流由负变正，副边电容开始充电，副边电容电压升高，输出电容电压升高；The first switch tube and the first main switch tube are kept on, the third switch tube is kept off, the input inductor current keeps increasing linearly, the resonant inductor current changes from negative to positive, the primary side capacitor starts to discharge, and the primary side capacitor voltage starts to decrease, The secondary side current of the isolation transformer changes from negative to positive, the secondary side capacitor starts to charge, the secondary side capacitor voltage increases, and the output capacitor voltage increases; 第三阶段：The third phase: 第一开关管和第二开关管开始关断，第三开关管保持关断，输入电感电流开始线性减小,谐振电感电流也开始减小，但依然为正值，输入电感电流给第二开关管的第二寄生电容充电，第二寄生电容电压开始升高，副边电流保持为正值，并给副边电容充电，副边电容电压增加，第三开关管的第三反并联二极管开始导通，开始给钳位电容充电；The first switch tube and the second switch tube start to be turned off, the third switch tube remains turned off, the input inductor current begins to decrease linearly, and the resonant inductor current also begins to decrease, but it is still a positive value, and the input inductor current is sent to the second switch. The second parasitic capacitor of the tube is charged, the voltage of the second parasitic capacitor begins to rise, the secondary side current remains positive, and the secondary side capacitor is charged, the voltage of the secondary side capacitor increases, and the third anti-parallel diode of the third switch tube begins to conduct. On, start to charge the clamping capacitor; 第四阶段：Fourth stage: 第一开关管和第二开关管保持关断,第三开关管开通，输入电感电流保持线性减小，谐振电感电流开始减小，但方向为正，直至减小到零，副边电流保持正值并给副边电容充电，副边电容电压增加，输出电容电压增加，直至谐振电感电流减小到零；The first switch tube and the second switch tube are kept off, the third switch tube is turned on, the input inductor current keeps decreasing linearly, the resonant inductor current begins to decrease, but the direction is positive, until it decreases to zero, the secondary side current remains positive value and charge the secondary side capacitor, the secondary side capacitor voltage increases, and the output capacitor voltage increases until the resonant inductor current decreases to zero; 第五阶段：Fifth stage: 第一开关管和第二开关管关断，第三开关管开通，谐振电感电流开始由零反向增加，钳位电容开始放电，副边电流开始反向变成负值，副边电容电压减小，输入电感电流保持线性减小；The first switch tube and the second switch tube are turned off, the third switch tube is turned on, the resonant inductor current begins to increase reversely from zero, the clamping capacitor begins to discharge, the secondary side current begins to reversely become negative, and the secondary side capacitor voltage decreases. Small, the input inductor current keeps decreasing linearly; 第六阶段：Stage 6: 第三开关管关断，谐振电感电流开始减小,方向为负，此时谐振电感中存储的能量大于第二寄生电容存储的能量，第二寄生电容电压将被放电至零，此时第一开关管、第二开关管的反并联二极管导通，若此时开通第一开关管、第二开关管，则第一开关管、第二开关管处于零电压开通状态，另一个周期开始。The third switch tube is turned off, the resonant inductor current begins to decrease, and the direction is negative. At this time, the energy stored in the resonant inductor is greater than the energy stored in the second parasitic capacitor, and the voltage of the second parasitic capacitor will be discharged to zero. The anti-parallel diodes of the switch tube and the second switch tube are turned on. If the first switch tube and the second switch tube are turned on at this time, the first switch tube and the second switch tube are in a zero-voltage on state, and another cycle starts.
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