CN108696138A - A kind of modularization large capacity isolated form DC/DC converters - Google Patents

A kind of modularization large capacity isolated form DC/DC converters Download PDF

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Publication number
CN108696138A
CN108696138A CN201810575015.9A CN201810575015A CN108696138A CN 108696138 A CN108696138 A CN 108696138A CN 201810575015 A CN201810575015 A CN 201810575015A CN 108696138 A CN108696138 A CN 108696138A
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China
Prior art keywords
diode
capacitance
anode
cathode
connection
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CN201810575015.9A
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Chinese (zh)
Inventor
邾玢鑫
段宛宜
余佩佩
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Yichang Chi Chi Technology Co Ltd
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Yichang Chi Chi Technology Co Ltd
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Priority to CN201810575015.9A priority Critical patent/CN108696138A/en
Publication of CN108696138A publication Critical patent/CN108696138A/en
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • H02M1/344—Active dissipative snubbers

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

Abstract

A kind of modularization large capacity isolated form DC/DC converters, compared to existing high-gain converter, automatic current equalizing can be achieved between each module, quantity wherein by adjusting and expanding contained diode and capacitance in each module, it can also be achieved the adjusting to input and output voltage gain, design freedom is higher, and control strategy is simple.Simultaneously by the leakage inductance energy buffer module with clamping capacitance, alleviates the high problem of switch tube voltage stress caused by leakage inductance, improve the efficiency of converter.Compared with existing large capacity isolated form height boosts DC/DC converter techniques, voltage stress, the current stress of all switches and diode are significantly reduced and are adjusted, it input and output high gain and is also adjusted, the application scenario of electrical isolation is needed suitable for large capacity and input and output.

Description

A kind of modularization large capacity isolated form DC/DC converters
Technical field
The present invention relates to DC-DC converter, specifically a kind of modularization large capacity isolated form DC/DC converters.
Background technology
Lack of energy, problem of environmental pollution are increasingly serious in recent years, and generation of electricity by new energy has the spies such as pollution-free, sustainable Point, application prospect are extremely wide.China's Oversea wind is resourceful, and exploitation Oversea wind resource has important reality meaning Justice, the remote offshore wind farm of large capacity are the trend of the following Wind Power Development.Since there are Frequency Synchronizations for traditional exchange confluence Property and many unfavorable factors such as harmonic content is higher, therefore offshore wind farm direct current confluence mode receive more and more researchs and Concern, and large capacity high-gain DC/DC converters are one of the key technologies of its realization, and limitation direct current confluence specific implementation One of problem.About the DC/DC converters applied to large capacity high-gain application scenario, it is commonly present problems with:(1), more Flow that difficult, of high cost and reliability is low when the operation of a wired in parallel;(2), the high no-load voltage ratio design of transformer of large capacity and manufacture difficulty Greatly.Therefore, while in order to realize high boosting, reduce system cost, simplify circuit structure, realize when each wired in parallel is run Equal flow problem is of great significance.
Invention content
To solve to flow difficult, complicated, control when isolated form high-gain converter multiple module paralleling is run in the prior art The problems such as difficult design processed, isolating transformer introduce larger leakage inductance, the present invention proposes a kind of modularization large capacity isolated form DC/DC Converter.
The technical solution that the present invention takes is:
A kind of modularization large capacity isolated form DC/DC converters, including:
One direct-current input power supplying, m module, an output diode D0, an output filter capacitor C0, load RL, one A leakage inductance energy buffer module, transformer T1,T2...Tm;
The transformer T1,T2...TmThe different name end of primary side is respectively connected with, transformer T1,T2...TmThe different name of secondary side End is also respectively connected with;Direct-current input power supplying cathode connection ground;
One leakage inductance energy buffer module includes a switch SVT, a capacitance CVT, an inductance LVT, one two Pole pipe DVT;
The converter further includes transformer leakage inductance Lk1,Lk2...Lkm, switch drain-source pole parasitic capacitance C1,C2...Cm;
Specific downlink connection mode is as follows:
In m module,
Side of the first module, inductance L1One end draw, inductance L1Other end connection leakage inductance LK1One end, it is described Inductance L1With leakage inductance LK1Node connectedness power switch S1Drain electrode and diode DVT1Anode, power switch S1Source electrode connection ground, Diode DVT1Cathode draw;Leakage inductance LK1Other end connection transformer T1The Same Name of Ends of primary side.
The secondary side of first module, transformer T1Secondary side Same Name of Ends connects capacitance C1(n-1)One end, capacitance C1(n-1)One End and transformer T1Node between secondary side Same Name of Ends is drawn, capacitance C1(n-1)Other end connection capacitance C1(n-2)One end, Capacitance C1(n-1)With capacitance C1(n-2)Between node connection diode D1(n-1)Cathode and extraction, D1(n-1)Anode is drawn;Successively It is connected to n-th of capacitance C repeatedly11One end, capacitance C11With capacitance C12Between node connection diode D12Cathode, diode D12Anode is drawn, capacitance C11Other end connection diode D11Cathode and extraction, diode D11Anode is drawn;
Side of the second module, inductance L2One end draw, inductance L2Other end connection leakage inductance LK2One end, it is described Inductance L2With leakage inductance LK2Node connectedness power switch S2Drain electrode and diode DVT2Anode, power switch S2Source electrode connection ground, Diode DVT2Cathode draw;Leakage inductance LK2The other end connect the second transformer T2The Same Name of Ends of primary side.
The secondary side of second module, transformer T2Secondary side Same Name of Ends connects capacitance C2nOne end, capacitance C2nThe other end Connect capacitance C2(n-1)One end, capacitance C2nWith capacitance C2(n-1)Node connection diode D2nCathode and extraction, diode D2n Anode is drawn;It is connected to n-th of capacitance C repeatedly successively21One end, capacitance C21With capacitance C22Between node connection diode D22 Cathode, diode D22Anode is drawn, capacitance C21Other end connection diode D21Cathode and extraction, diode D21Anode It draws;
And so on to m modules,
Side of m modules, inductance LmOne end draw, inductance LmOther end connection leakage inductance LKmOne end, it is described Inductance LmWith leakage inductance LKmNode connectedness power switch SmDrain electrode and diode DVTmAnode, power switch SmSource electrode connection ground, Diode DVTmCathode draw.Leakage inductance LKmOther end connection m transformers TmThe Same Name of Ends of primary side.
The secondary side of m modules, transformer TmSecondary side Same Name of Ends connects capacitance CmnOne end, capacitance CmnThe other end connect Meet capacitance Cm(n-1)One end, capacitance CmnWith capacitance Cm(n-1)Node connection diode DmnCathode, diode DmnAnode draws Go out;It is connected to n-th of capacitance C repeatedly successivelym1One end, capacitance Cm1With capacitance Cm2Between node connection diode Dm2Cathode, Diode Dm2Anode is drawn, capacitance Cm1Other end connection diode Dm1Cathode and extraction, diode Dm1Anode is drawn;
Downlink connection between modules:
Module 1, inductance L1One end connects direct-current input power supplying anode, diode DVT1Cathode connection leakage inductance energy buffering Capacitance C in moduleVTOne end, capacitance C1(n-1)One end and transformer T1Intermediate node exit connection diode D2nAnode, Diode D1(n-1)Cathode connection diode D2(n-1)Anode, diode D1(n-1)Anode connection diode DmnCathode;With this It is extrapolated to diode D11Cathode connection diode D21Anode, diode D11Anode connects diode Dm2Cathode;
Module 2, inductance L2One end connects direct-current input power supplying anode, diode DVT2Cathode connection leakage inductance energy buffering Capacitance C in moduleVTOne end.Diode D2nCathode connection diode D3nAnode, diode D2(n-1)Cathode connection two Pole pipe D3(n-1)Anode;And so on arrive diode D21Cathode connection diode D31Anode;
And so on to m modules,
Module m, inductance LmOne end connects direct-current input power supplying anode, diode DVTmCathode connection leakage inductance energy buffering Capacitance C in moduleVTOne end, diode DmnCathode connection diode D1(n-1)Anode, diode Dm(n-1)Cathode connection Diode D1(n-2)Anode;And so on arrive diode Dm2Cathode connection diode D11Anode;
Finally in capacitance Cm1Other end connection diode D0Anode, diode D0Cathode and capacitance C0With load RL One end be connected, capacitance C0The other end and load RLThe other end and transformer T1Secondary side Same Name of Ends is connected.
In leakage inductance energy buffer module, inductance LVTThe other end connection direct-current input power supplying anode, inductance LVTOne end connect Meet power switch SVTSource electrode, power switch SVTDrain electrode connection clamping capacitance one end, clamping capacitance the other end connection Ground;Inductance LVTOne end and power switch drain electrode between Node connectedness diode DVTCathode, diode DVTAnode connection Ground.
Its control mode is:Interleaved control strategy is used between adjacent power switch, i.e., switchs and drive between every adjacent two-phase Dynamic phase differs 180 °.Leakage inductance energy buffer module switch SVTAction is according to capacitance CVTIt sets voltage to determine, 1-D need to be more than, Middle D is power switch S1,S2...SmDuty ratio.
The present invention is a kind of modularization large capacity isolated form DC/DC converters, and technique effect is as follows:
1, the present invention realizes that high-gain exports using modularization isolated form DC/DC converters, and often increasing a module can carry Several times basis gain on the basis of plateau, each module input current can automatic current equalizing, and switch and diode current stress and electricity Compression is also reduced.Wherein:
Input and output gain is:
Switch tube voltage stress is:
Diode D0Voltage stress be:
Diode D11,D21...DmnVoltage stress be:
The current stress of switching tube is:
The current stress of diode is:
Wherein, N is transformer voltage ratio, and m is number of modules, and n is the quantity of Circuit Fault on Secondary Transformer diode and capacitance in module, D is duty ratio.
2, in each duty cycle of switching phase simultaneously as the ampere-second of capacitance balances, each module can realize automatic current equalizing, The power-sharing of transformer ensures to flow without any control strategy, has control compared to such other converter and drives The simple advantage of dynamic circuit.
3, the converter input and output high gain is not necessarily to excessive transformer turn ratio, design of transformer and is simple to manufacture. Carried leakage inductance energy buffer module is simple in structure, and control is independent, does not influence the work of former converter.
Description of the drawings
Fig. 1 is circuit theory total figure of the present invention.
Fig. 2 is that circuit of the present invention is m=4, the circuit topology figure of n=2.
Fig. 3 is main switch drive signal, voltage, clamping capacitor voltage oscillogram.
Fig. 4 is input, output voltage waveform.
Fig. 5 is inductive current oscillogram.
Fig. 6 is main switch current waveform figure.
Fig. 7 is transformer leakage inductance current waveform figure.
Fig. 8 is diode D22,D32Voltage and current waveform.
Fig. 9 is capacitance C11,C21,C31,C41Terminal voltage oscillogram.
Figure 10 is switch SVTDriving, terminal voltage and current waveform figure.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings, embodiment:
As shown in Fig. 2, a kind of 4 module DC/DC converters of large capacity isolated form, it includes 1 direct-current input power supplying, 4 A module, an output diode D0, an output filter capacitor C0, load RL, a leakage inductance energy buffer module, and consider Transformer leakage inductance Lk1,Lk2,Lk3,Lk4With switch drain-source pole parasitic capacitance C1,C2,C3,C4.Wherein, transformer T1To T4Primary side Different name end is respectively connected with, transformer T1To T4The different name end of secondary side is also respectively connected with, power cathode connection ground;
In 4 modules:
First side of module one time:Inductance L1One end draw, the other end connects leakage inductance LK1One end, in inductance L1And leakage inductance LK1Node connectedness power switch S1Drain electrode and diode DVT1Anode, power switch S1Source electrode connection ground, diode DVT1's Cathode is drawn.Leakage inductance LK1Other end connection transformer T1The Same Name of Ends of primary side.
The secondary side of first module:Transformer T1Secondary side Same Name of Ends connects capacitance C11One end, capacitance C11One end and transformation Device T1Node between secondary side Same Name of Ends is drawn, capacitance C11Other end connection diode D11Cathode and extraction, D11Anode It draws;
Second side of module one time:Inductance L2One end draw, the other end connects leakage inductance LK2One end, in inductance L2And leakage inductance LK2Node connectedness power switch S2Drain electrode and diode DVT2Anode, power switch S2Source electrode connection ground, diode DVT2's Cathode is drawn.Leakage inductance LK2Other end connection transformer T2The Same Name of Ends of primary side.
The secondary side of second module, transformer T2Secondary side Same Name of Ends connects capacitance C22One end, capacitance C22The other end connect Meet capacitance C21One end, capacitance C22With capacitance C21Node connection diode D22Cathode and extraction, D22Anode is drawn;Capacitance C21Other end connection diode D21Cathode and extraction, D21Anode is drawn.
Side of third module:Inductance L3One end draw, the other end connects leakage inductance LK3One end, in inductance L3And leakage inductance LK3Node connectedness power switch S3Drain electrode and diode DVT3Anode, power switch S3Source electrode connection ground, diode DVT3's Cathode is drawn.Leakage inductance LK3Other end connection transformer T3The Same Name of Ends of primary side.
The secondary side of third module, transformer T3Secondary side Same Name of Ends connects capacitance C32One end, capacitance C32The other end connect Meet capacitance C31One end, capacitance C32With capacitance C31Node connection diode D32Cathode and extraction, D32Anode is drawn, capacitance C31Other end connection diode D31Cathode and extraction, D31Anode is drawn.
4th side of module one time, inductance L4One end draw, the other end connects leakage inductance LK4One end, in inductance L4And leakage inductance LK4Node connectedness power switch S4Drain electrode and diode DVT4Anode, power switch S4Source electrode connection ground, diode DVT4's Cathode is drawn.Leakage inductance LK4Other end connection transformer T4The Same Name of Ends of primary side.
The 4th secondary side of module, transformer T4Secondary side Same Name of Ends connects capacitance C42One end, capacitance C42The other end connect Meet capacitance C41One end, capacitance C42With capacitance C41Node connection diode D42Cathode, D42Anode is drawn, capacitance C41It is another One end connects diode D41Cathode and extraction, D41Anode is drawn.
Downlink connection between modules:
Module 1, inductance L1One end connects positive pole, diode DVT1Cathode connection leakage inductance energy buffer module in electricity Hold CVTOne end.Capacitance C11One end and transformer T1Intermediate node exit connection diode D22Anode, diode D11's Cathode connects diode D21Anode, diode D11Anode connects diode D42Cathode;
Module 2, inductance L2One end connects positive pole, diode DVT2Cathode connection leakage inductance energy buffer module in electricity Hold CVTOne end.Diode D22Cathode connection diode D32Anode, diode D21Cathode connection diode D31Sun Pole;
Module 3, inductance L3One end connects positive pole, diode DVT3Cathode connection leakage inductance energy buffer module in electricity Hold CVTOne end.Diode D32Cathode connection diode D42Anode, diode D31Cathode draw connection diode D41's Anode;
Module 4, inductance L4One end connects positive pole, diode DVT4Cathode connection leakage inductance energy buffer module in electricity Hold CVTOne end.Diode D42Cathode connection diode D11Anode.
Finally in capacitance C41The other end draw diode D0Anode, diode D0Cathode and capacitance C0With load RL One end be connected, capacitance C0With load RLThe other end and transformer T1Secondary side Same Name of Ends is connected.
Wherein leakage inductance energy buffer module includes:Inductance LVT, switching tube SVT, diode DVT, clamping capacitance CVT.It is repeatedly The mode of connecing is:Inductance LVTThe other end connect positive pole, one end connects power switch SVTSource electrode, power switch SVTLeakage Pole connects one end of clamping capacitance, the other end connection ground of clamping capacitance;Inductance LVTOne end and power switch drain electrode between Node connectedness diode DVTCathode, diode DVTAnode connection ground.
According to the difference of power switch state, circuit can be divided into 10 kinds of working conditions:
(1), power switch S1,S2,S3,S4It is both turned on, input power passes through power switch S at this time1, power switch S2, work( Rate switch S3, power switch S4Respectively to inductance L1, inductance L2, inductance L3, inductance L4Charging, secondary lateral capacitance power on pressure and keep not Become, all diodes are turned off.
(2), controller controls the first power switch S1, third power switch S3Shutdown, the second power switch S2With the 4th work( Rate switch S4Conducting, inductance L2,L4Continue to charge.Side, inductance L1,L3Electric discharge, due to leakage inductance LK1,LK3Limitation, electric current It can only be first to switch S1Electrode capacitance C1With switch S3Electrode capacitance C3Charging, due to capacitance C1,C3Presence, limit switch S1,S3The rate of climb of drain-source voltage.The process continues to switch electrode capacitance C1,C3Voltage rises to capacitance C21,C41Voltage u0/8N。
(3), as switch electrode capacitance C1,C3Voltage rises to capacitance C12,C14Voltage u0When/8N, diode D21,D22, D41,D42Conducting, leakage inductance LK1,LK3Electric current is begun to ramp up, but the rate of climb is limited, therefore diode D21,D22,D41,D42It realizes Approximate zero current passing.Inductance L1,L3Electric current continues as switch electrode capacitance C1,C3Charging.The process continues to switch electrode capacitance C1, C3Upper voltage rises to clamping capacitance CVTVoltage uCVTUntil.Due to switching electrode capacitance C1,C3Very small, the process is in performance evaluation When can ignore, it is believed that leakage inductance LK1,LK3With switch pole capacitance voltage by capacitance C at the time of electric current risesVTAt the time of clamp Unanimously.
At this moment diode DVT1,DVT3Conducting.Due to clamping capacitance CVTRelative to switch electrode capacitance C1,C3For it is very big, because This inductance L1,L3Most of electric current will pass through diode DVT1,DVT3Flow into clamping capacitance CVTIn, capacitance CVTCharging, switch S1, S3Voltage be clamped to capacitance CVTVoltage.The process continues to leakage inductance LK1,LK3Electric current rises to inductance L1,L3Until electric current.
Secondary side, induced current pass through the first transformer T1Secondary side Same Name of Ends passes through diode D22, the second transformer T2To capacitance C22Charging, passes through capacitance C11With diode D21To capacitance C21C is given in charging11Electric discharge;Induced current is become by third Depressor T3Secondary side Same Name of Ends passes through capacitance C32, diode D42, the 4th transformer T4To capacitance C42C is given in charging32Electric discharge, passes through Capacitance C31With diode D41To capacitance C41C is given in charging31Electric discharge;Second power switch S at this time2With the 4th power switch S4Lead Logical, input power passes through power switch S respectively2,S4To inductance L2,L4Charging;Diode diode D31,D32,D11,D0It is turned off.
(4), as leakage inductance LK1,LK3Electric current rises to inductance L1,L3When electric current, diode DVT1,DVT3Shutdown, clamping capacitance CVT Charging terminates.Power switch S at this time1,S3Drive signal arrives.
(5),S1,S3It is open-minded, leakage inductance L at this timeK1,LK3Terminal voltage is reversed, is-u0/ 8N, leakage inductance LK1,LK3Electric current reaches maximum It is worth and begins to decline.The process continues to leakage inductance LK1,LK3Electric current drops to 0 end.
(6), as leakage inductance LK1,LK3When electric current drops to 0, all diodes of Circuit Fault on Secondary Transformer are turned off, power switch S1, S2,S3,S4It is both turned on, this state is consistent with state (1).
State (7) later arrives state (10), switch S1, switch S3Switching state and switch S2, switch S4Open It is similar to close switching state, is not repeated to illustrate.
State (8) is similar with state (3), secondary side, diode D31,D32,D11,D0Conducting, induced current become by second Depressor T2Secondary side Same Name of Ends passes through capacitance C22, diode D32, third transformer T3To capacitance C32Capacitance C is given in charging22Electric discharge, Pass through capacitance C21With diode D31To capacitance C31C is given in charging21Electric discharge;Induced current passes through the 4th transformer T4Secondary side is of the same name End passes through capacitance C42, diode D11, the first transformer T1To capacitance C11C is given in charging42Electric discharge, passes through capacitance C41And diode Do, give C41Electric discharge, to capacitance CoCharging is simultaneously to load RLPower supply.Diode D21,D22,D41,D42It is turned off.
According to clamping capacitance CVTCharge status, clamp circuit can be divided into 3 kinds of working conditions:
(1), diode DVT1,DVT2,DVT3,DVT4When any one or more conductings, branch corresponding to the diode of conducting Inductance to clamping capacitance CVTCharging.
(2), diode DVT1,DVT2,DVT3,DVT4It is turned off, public clamp circuit switch SVTIt disconnects, at this time clamping capacitance CVTIt neither charges nor discharges.
(3), public clamp circuit switch SVTConducting, capacitance CVTTo inductance LVTElectric discharge, inductance LVTCharging, diode DVTIt closes It is disconnected.
By above-mentioned analysis, 180 ° of paralleling and interleaving control modes share input current by four input inductance, are realizing The current stress of component, switching loss can effectively be reduced while height boosting.Using leakage inductance energy buffer module, reduces and become The influence for the due to voltage spikes that depressor leakage inductance is generated to switching tube improves the efficiency of converter.And leakage inductance energy buffer circuit with Main circuit decouples, and can work independently, control strategy is simple.
Simulation parameter:Input voltage uin=30V, output voltage u0Connect nearly 800V, rated power P0=320W, main switch The switching frequency f=50kHz of pipe, main switch duty ratio D=0.7, clamp circuit switching tube switching frequency f=100kHz, duty Than D=0.3, transformer voltage ratio N=1, it can be seen that the electric current for flowing through 4 inductance is equal, and each module realizes automatic current equalizing.

Claims (3)

1. a kind of modularization large capacity isolated form DC/DC converters, it is characterised in that including:
One direct-current input power supplying,mA module, an output diode D0, an output filter capacitorC 0, loadR L , a leakage Inductance energy buffer module, transformer T1,T2... T m ;
The transformer T1,T2... T m The different name end of primary side is respectively connected with, transformer T1,T2... T m The different name end of secondary side Also it is respectively connected with;Direct-current input power supplying cathode connection ground;
One leakage inductance energy buffer module includes a switch SVT, a capacitanceC VT, an inductanceL VT, a diode DVT;
The converter further includes transformer leakage inductanceL k1,L k2... L km , switch drain-source pole parasitic capacitanceC 1,C 2... C m ;
Specific downlink connection mode is as follows:
mIn a module,
Side of the first module, inductanceL 1One end draw, inductanceL 1The other end connect leakage inductanceL K1One end, the inductanceL 1And leakage inductanceL K1Node connectedness power switch S1Drain electrode and diode DVT1Anode, power switch S1Source electrode connection ground, two poles Pipe DVT1Cathode draw;Leakage inductanceL K1Other end connection transformer T1The Same Name of Ends of primary side;
The secondary side of first module, transformer T1Secondary side Same Name of Ends connects capacitanceC 1(n-1)One end, capacitanceC 1(n-1)One end and change Depressor T1Node between secondary side Same Name of Ends is drawn, capacitanceC 1(n-1)The other end connect capacitanceC 1(n-2)One end, capacitanceC 1(n-1)With capacitanceC 1(n-2)Between node connection diode D1(n-1)Cathode and extraction, D1(n-1)Anode is drawn;Successively repeatedly It is connected tonA capacitanceC 11One end, capacitanceC 11With capacitanceC 12Between node connection diode D12Cathode, diode D12Sun Pole is drawn, capacitanceC 11Other end connection diode D11Cathode and extraction, diode D11Anode is drawn;
Side of the second module, inductanceL 2One end draw, inductanceL 2The other end connect leakage inductanceL K2One end, the inductanceL 2And leakage inductanceL K2Node connectedness power switch S2Drain electrode and diode DVT2Anode, power switch S2Source electrode connection ground, two poles Pipe DVT2Cathode draw;Leakage inductanceL K2The other end connect the second transformer T2The Same Name of Ends of primary side;
The secondary side of second module, transformer T2Secondary side Same Name of Ends connects capacitanceC 2n One end, capacitanceC 2n The other end connection CapacitanceC 2(n-1)One end, capacitanceC 2n With capacitanceC 2(n-1)Node connection diode D2n Cathode and extraction, diode D2n Anode It draws;It is connected to repeatedly successivelynA capacitanceC 21One end, capacitanceC 21With capacitanceC 22Between node connection diode D22The moon Pole, diode D22Anode is drawn, capacitanceC 21Other end connection diode D21Cathode and extraction, diode D21Anode is drawn;
And so on tomModule,
ThemSide of module, inductanceL m One end draw, inductanceL m The other end connect leakage inductanceL Km One end, the inductanceL m And leakage inductanceL Km Node connectedness power switch S m Drain electrode and diode DVTm Anode, power switch S m Source electrode connection ground, diode DVTm Cathode draw;Leakage inductanceL Km Other end connection themTransformer T m The Same Name of Ends of primary side;
ThemThe secondary side of module, transformer T m Secondary side Same Name of Ends connects capacitanceC mn One end, capacitanceC mn The other end connection electricity HoldC m(n-1)One end, capacitanceC mn With capacitanceC m(n-1)Node connection diode D mn Cathode, diode D mn Anode is drawn;According to It is secondary to be connected to repeatedlynA capacitanceC m1One end, capacitanceC m1With capacitanceC m2Between node connection diode D m2Cathode, two poles Pipe D m2Anode is drawn, capacitanceC m1Other end connection diode D m1Cathode and extraction, diode D m1Anode is drawn;
Downlink connection between modules:
Module 1, inductanceL 1One end connects direct-current input power supplying anode, diode DVT1Cathode connection leakage inductance energy buffer module in CapacitanceC VTOne end, capacitanceC 1(n-1)One end and transformer T1Intermediate node exit connection diode D2n Anode, diode D1(n-1)Cathode connection diode D2(n-1)Anode, diode D1(n-1)Anode connection diode D mn Cathode;And so on arrive Diode D11Cathode connection diode D21Anode, diode D11Anode connects diode D m2Cathode;
Module 2, inductanceL 2One end connects direct-current input power supplying anode, diode DVT2Cathode connection leakage inductance energy buffer module in CapacitanceC VTOne end;Diode D2n Cathode connection diode D3n Anode, diode D2(n-1)Cathode connect diode D3(n-1)Anode;And so on arrive diode D21Cathode connection diode D31Anode;
And so on tomModule,
Modulem, inductanceL m One end connects direct-current input power supplying anode, diode DVTm Cathode connection leakage inductance energy buffer module in CapacitanceC VTOne end, diode D mn Cathode connection diode D1(n-1)Anode, diode D m(n-1)Cathode connect diode D1(n-2)Anode;And so on arrive diode D m2Cathode connection diode D11Anode;
Finally in capacitanceC m1Other end connection diode D0Anode, diode D0Cathode and capacitanceC 0And loadR L One End is connected, capacitanceC 0The other end and loadR L The other end and transformer T1Secondary side Same Name of Ends is connected;
In leakage inductance energy buffer module, inductanceL VTThe other end connection direct-current input power supplying anode, inductanceL VTOne end connect work( Rate switch SVTSource electrode, power switch SVTDrain electrode connection clamping capacitance one end, clamping capacitance the other end connection ground;Electricity SenseL VTOne end and power switch drain electrode between Node connectedness diode DVTCathode, diode DVTAnode connection ground.
2. a kind of modularization large capacity isolated form DC/DC converters according to claim 1, it is characterised in that:Its controlling party Formula is:Interleaved control strategy is used between adjacent power switch, i.e., often switch drive phase differs 180 ° between adjacent two-phase;Leakage Inductance energy buffer module switch SVTAction is according to capacitanceC VTIt sets voltage to determine, 1- need to be more thanD, whereinDFor power switch S1, S2...S m Duty ratio.
3. a kind of modularization large capacity isolated form DC/DC converters according to claim 1, it is characterised in that:According to clamp CapacitanceC VTCharge status, clamp circuit is divided into 3 kinds of working conditions:
(1), diode DVT1,DVT2,DVT3,DVT4When any one or more conductings, the electricity of branch corresponding to the diode of conducting Feel to clamping capacitanceC VTCharging;
(2), diode DVT1,DVT2,DVT3,DVT4It is turned off, public clamp circuit switch SVTIt disconnects, at this time clamping capacitanceC VTNeither Charging is not also discharged;
(3), public clamp circuit switch SVTConducting, capacitanceC VTTo inductanceL VTElectric discharge, inductanceL VTCharging, diode DVTShutdown.
CN201810575015.9A 2018-06-06 2018-06-06 A kind of modularization large capacity isolated form DC/DC converters Pending CN108696138A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104796029A (en) * 2015-01-27 2015-07-22 南通睿觅新能源科技有限公司 Micro inverter applied to photovoltaic solar
CN106787723A (en) * 2016-12-29 2017-05-31 三峡大学 A kind of multi input boosting DC/DC converters high
CN106992676A (en) * 2017-05-27 2017-07-28 三峡大学 A kind of high-freedom degree DC/DC converters of automatic current equalizing
EP3247029A1 (en) * 2016-05-18 2017-11-22 Rectifier Technologies Pacific Pty Ltd Three-phase power-factor correcting ac-dc self-balancing rectifier without neutral connection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104796029A (en) * 2015-01-27 2015-07-22 南通睿觅新能源科技有限公司 Micro inverter applied to photovoltaic solar
EP3247029A1 (en) * 2016-05-18 2017-11-22 Rectifier Technologies Pacific Pty Ltd Three-phase power-factor correcting ac-dc self-balancing rectifier without neutral connection
CN106787723A (en) * 2016-12-29 2017-05-31 三峡大学 A kind of multi input boosting DC/DC converters high
CN106992676A (en) * 2017-05-27 2017-07-28 三峡大学 A kind of high-freedom degree DC/DC converters of automatic current equalizing

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