CN108599580A - A kind of adjustable high boosting isolated form DC/DC converters of bridge arm number - Google Patents

A kind of adjustable high boosting isolated form DC/DC converters of bridge arm number Download PDF

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Publication number
CN108599580A
CN108599580A CN201810575178.7A CN201810575178A CN108599580A CN 108599580 A CN108599580 A CN 108599580A CN 201810575178 A CN201810575178 A CN 201810575178A CN 108599580 A CN108599580 A CN 108599580A
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capacitance
diode
transformer
same name
connect
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CN108599580B (en
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邾玢鑫
王寒
刘崧
杨楠
李振华
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time

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

Abstract

The present invention proposes a kind of adjustable high boosting isolated form DC/DC converters of bridge arm number, contains if setting the adjustable high boosting isolated form DC/DC converters of the bridge arm numbermA bridge arm, then its composition is as follows：One DC input voitage source, 2 input side filter capacitors,mA bridge arm,mA no-load voltage ratio is 1：kHigh frequency transformer, the inverter bridge other end hasnA high boosting gain unit each contains 2 in high boosting gain unitmA capacitance and 2mA diode.Compared to existing bridge-type isolated form DC/DC converters, its bridge arm number is freely adjustable, and the electric current automatic current equalizing of each bridge arm, input and output high gain and adjustable, switching device voltage and current stress are low, and the large capacity promotion that may be applicable to electrical isolation is had a meeting, an audience, etc. well under one's control in conjunction.

Description

A kind of adjustable high boosting isolated form DC/DC converters of bridge arm number
Technical field
The present invention relates to a kind of DC-DC converters, and in particular to a kind of adjustable high boosting isolated form DC/ of bridge arm number DC converters.
Background technology
Constantly expand with the scale of marine wind electric field, the promotion of offshore distance, the advantage of direct current confluence and technology of transmission of electricity Gradually show, but the design of high-gain large capacity DC/DC converters is the big bottleneck for restricting offshore wind farm and realizing direct current confluence. Traditional diode bridge rectifier is widely used, but on the one hand its rectifier output voltage is relatively low, this defeated to marine wind field Enter the more demanding occasion of output voltage gain to be difficult to be competent at, needs to promote entire change by means of improving the turn ratio of transformer The gain of parallel operation.And the design of transformer of the high turn ratio of large capacity is more difficult, limits the development of high power converters.It is another Aspect diode voltage stress is high, and for the DC convergent current bus bar voltage of marine wind electric field usually in 40kV, parts selection is more difficult.
Higher voltage output may be implemented in voltage doubling rectifing circuit at this stage, but is usually used in the application of smaller power grade In occasion, there are problems that diode current stress is excessive and is difficult to design in large capacity application scenario, using multiple input It is in parallel and is difficult to equilibrium assignment there are power between each phase, each device current stress and fever are uneven in system, can It is a greater impact by property and service life.
Invention content
For deficiencies of the prior art, when to solve existing voltage doubling rectifing circuit Multiphase Parallel, stream is difficult asks Topic, the present invention propose can automatic current equalizing a kind of adjustable high boosting isolated form DC/DC converters of bridge arm number.
The present invention adopts the following technical scheme that：
The adjustable high boosting isolated form DC/DC converters of a kind of bridge arm number, including 1 direct-current input power supplying, 2 input sides Filter capacitor C1、C2, m inverter bridge leg, each bridge arm includes 2 power switch.The wherein shared 2m no-load voltage ratio of rectification side is 1： The high frequency transformer of k, n gain unit, 4m output diode D1、D2、D3...D2m、D01、D02、D03...D0(2m), 1 defeated Go out filter capacitor C0, 1 load RL.Include 2m capacitance C in wherein each gain unit11、C12...Cn(2m)With 2m diode D11、D12...Dn(2m).M bridge arm corresponds to 2m the input phase, and it is as follows to put forward transformation implement body connection type：
Input side filter capacitor C1Another termination C2One end, and the tie point is denoted as node 0, C1One termination DC power supply is just Pole, C2Another termination DC power cathode.In inverter bridge leg, every 2 power switch form a bridge arm, i.e. S11、S12Constitute the 1st Bridge arm, S11Drain electrode meets positive pole, S11Source electrode meets S12Drain electrode, and the tie point is denoted as node 1, S12Source electrode connects power cathode. S21、S22Constitute Bridge 2 arm, S21Drain electrode meets positive pole, S21Source electrode meets S22Drain electrode, and the tie point is denoted as node 2, S22Source electrode Connect power cathode.And so on Sm1、Sm2Constitute m bridge arms, Sm1Drain electrode meets positive pole, Sm1Source electrode meets Sm2Drain electrode, and the section Point is denoted as node m, Sm2Source electrode connects power cathode.
Inverter bridge leg node 1,2,3...m meet transformer T respectively1、T3、T5...T2m-1Primary side Same Name of Ends, node 0 connect change Depressor T2、T4、T6...T2mPrimary side Same Name of Ends, all transformer primary side different name ends are sequentially connected.
The connection type of n gain unit is as follows：
Gain unit 1 is by 2m capacitance C11、C12...C1(2m), 2m diode D11、D12...D1(2m)It constitutes, internal junction Diode D in structure11Cathode connect capacitance C11One end, anode connects capacitance C12The other end, diode D12Cathode connect capacitance C12One end, anode connects capacitance C13The other end ... diode D1(2m-1)Cathode connect capacitance C1(2m-1)One end, anode even electricity Hold C1(2m)The other end, diode D1(2m)Cathode connect capacitance C1(2m)One end, anode connect capacitance C11The other end.
Gain unit 2 is by 2m capacitance C21、C22...C2(2m), 2m diode D21、D22...D2(2m)It constitutes, internal junction Diode D in structure21Cathode connect capacitance C21One end, anode connect capacitance C22The other end, diode D22Cathode connect capacitance C22One End, anode connect capacitance C23The other end ... diode D2(2m-1)Cathode connect capacitance C2(2m-1)One end, anode connect capacitance C2(2m)It is another End, diode D2(2m)Cathode connect capacitance C2(2m)One end, anode connect capacitance C21The other end.
And so on arrive gain unit n.
Gain unit n is by 2m capacitance Cn1、Cn2...Cnm, 2m diode Dn1、Dn2...Dn(2m)It constitutes, internal structure Middle diode Dn1Cathode connect capacitance Cn1One end, anode connect capacitance Cn2The other end, diode Dn2Cathode connect capacitance Cn2One end, Anode connects capacitance Cn3The other end ... diode Dn(2m-1)Cathode connect capacitance Cn(2m-1)One end, anode connect capacitance Cn(2m)The other end, Diode Dn(2m)Cathode connect capacitance Cn(2m)One end, anode connect capacitance Cn1The other end.
All Circuit Fault on Secondary Transformer different names end is sequentially connected.Capacitance C in gain unit 111、C12...C1(2m)One end difference Meet transformer T1、T2...T2mSecondary side Same Name of Ends, capacitance C in gain unit 221、C22...C2(2m)One end connect gain list respectively Capacitance C in member 111、C12...C1(2m)The other end, capacitance C in gain unit 331、C32...C3(2m)One end connect gain list respectively Capacitance C in member 221、C22...C2(2m)The other end ... gain unit n in capacitance Cn1、Cn2...Cn(2m)One end connect gain respectively Capacitance C in unit n-1(n-1)1、C(n-1)2...C(n-1)(2m)The other end, capacitance C in gain unit nn1、Cn2...Cn(2m)It is another End meets diode D respectively1、D2...D2mCathode, diode D1、D2...D2m, anode meet filter capacitor C0With load RLOne End.Filter capacitor C0With load RLAnother terminating diode D01、D02...D0(2m)Cathode, diode D01、D02...D0(2m)'s Anode meets diode D in gain unit 1 respectively11、D12...D1(2m)Cathode.
Its control mode：For each switch of the bridge arm subscript tail marked as 1, i.e. S is connected in 0 °~180 ° sections11、 S21...Sm1.Each bridge arm subscript tail is connected marked as 2 switches, i.e. S in 180 °~360 ° sections12、S22...Sm2.Each group is opened Closing conducting, there are enough dead times.
Compared to existing isolated form technology, a kind of adjustable high boosting isolated form DC/DC converters of bridge arm number of the present invention have Following advantageous effect：
1, the present invention realizes the boosting output of converter height using multiple gain units, according to demand adjust gain unit number Make change in gain, have wide range of applications, is more suitable for large-scale promotion and has a meeting, an audience, etc. well under one's control conjunction, and the transformer of relatively low no-load voltage ratio can be used to reach The purpose of height boosting, the design difficulty of transformer substantially reduce.And the converter is compared with prior art, secondary side diode voltage Stress also more reduces.Wherein：
Input and output gain is (zero load)：
The voltage stress of diode is in gain unit：
The voltage stress of output diode is：
In formula, uinFor input voltage, u0For output voltage, k is primary side the number of turns in transformer secondary turn ratio, and n is gain Unit number, m are inverter bridge leg number.(i=1,2 ..., n；J=1,2 ..., m)
2, each mutually to realize that automatic current equalizing, secondary side are flowed per phase current with each bridge arm since the ampere-second of capacitance balances To which primary side flows through the electric current equalization of transformer, the power-sharing of transformer ensures to flow without any control strategy, with It is compared in such a way that external circuit detection, control are realized and flowed, reduces circuit complexity, circuit heat dissipation is more easily controlled, Cost greatly reduces simultaneously.
3, the converter can adjust the input number of phases according to different application scenarios, adapt to the high current input of bigger Occasion, capacity increases, and each phase automatic current equalizing.Inverter bridge leg number is adjusted to adjust the input number of phases, per the electricity of phase and diode Stream stress can change accordingly.
Description of the drawings
Fig. 1 is circuit theory total figure of the present invention
Fig. 2 is the topology of adjustable high boosting isolated form DC/DC converters 2 gain units Han 2 bridge arms of the bridge arm number Figure
Fig. 3 is to flow principle analysis figure
When Fig. 4 is converter m=2, n=2, input voltage uin, output voltage u0, capacitance C11、C12、C21、C22Voltage, Inverter bridge leg output voltage u1Simulation waveform.
When Fig. 5 is converter m=2, n=2, transformer T1、T2、T3、T4Current simulations oscillogram.
When Fig. 6 is converter m=2, n=2, diode D11、D12Voltage and current simulation waveform.
When Fig. 7 is converter m=2, n=2, diode D1、D2Voltage and current simulation waveform.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings.
As shown in Fig. 2, the adjustable high boosting isolated form DC/DC converters of bridge arm number opening up containing 22 gain units of bridge arm Figure is flutterred, it includes 1 direct-current input power supplying, 2 input side filter capacitor C1、C2, 2 tri-level inversion bridge arms, 4 no-load voltage ratios are 1：The high frequency transformer T of k1、T2、T3、T4, 2 gain units, 8 output diode D1、D2、D3、D4、D01、D02、D03、D04, 1 A output filter capacitor C0, 1 load RL.Include 4 capacitances and 4 diodes in wherein each gain unit.Each inverter bridge Arm includes 2 power switch.2 bridge arms correspond to 4 the input phases, are specifically connected as：
Input side filter capacitor C1Another termination C2One end, and the tie point is denoted as node 0, C1One termination DC power supply is just Pole, C2Another termination DC power cathode.In inverter bridge leg, every 2 power switch form a bridge arm, i.e. S11、S12Constitute the 1st Bridge arm, S11Drain electrode meets positive pole, S11Source electrode meets S12Drain electrode, and the tie point is denoted as node 1, S12Source electrode connects power cathode. S21、S22Constitute Bridge 2 arm, S21Drain electrode meets positive pole, S21Source electrode meets S22Drain electrode, and the tie point is denoted as node 2, S22Source electrode Connect power cathode.
Inverter bridge leg node 1,2 meets transformer T respectively1、T3Primary side Same Name of Ends, node 0 meet transformer T2、T4Primary side Same Name of Ends, all transformer primary side different name ends are sequentially connected.
The connection type of 2 gain units is as follows：
Gain unit 1 is by 4 capacitance C11、C12、C13、C14, 4 diode D11、D12、D13、D14It constitutes, internal structure Middle diode D11Cathode connect capacitance C11One end, anode connects capacitance C12The other end, diode D12Cathode connect capacitance C12 One end, anode connects capacitance C13The other end, diode D13Cathode connect capacitance C13One end, anode connects capacitance C14It is another End, diode D14Cathode connect capacitance C14One end, anode connects capacitance C11The other end.
Gain unit 2 is by 4 capacitance C21、C22、C23、C24, 4 diode D21、D22、D23、D24It constitutes, internal structure Middle diode D21Cathode connect capacitance C21One end, anode connects capacitance C22The other end, diode D22Cathode connect capacitance C22 One end, anode connects capacitance C23The other end, diode D23Cathode connect capacitance C23One end, anode connects capacitance C24It is another End, diode D24Cathode connect capacitance C24One end, anode connects capacitance C21The other end.
All Circuit Fault on Secondary Transformer different names end is sequentially connected.Capacitance C in gain unit 111、C12、C13、C14One end difference Meet transformer T1、T2、T3、T4Secondary side Same Name of Ends, capacitance C in gain unit 221、C22、C23、C24One end connect gain list respectively Capacitance C in member 111、C12、C13、C14The other end, capacitance C21、C22、C23、C24The other end meet diode D respectively1、D2、D3、D4 Cathode, diode D1、D2、D3、D4Anode meet filter capacitor C0With load RLOne end.Filter capacitor C0With load RLIt is another One terminating diode D01、D02、D03、D04Cathode, diode D01、D02、D03、D04Anode connects diode in gain unit 1 respectively D11、D12、D13、D14Cathode.
2, the high boosting isolated form DC/DC converters of 2 bridge arms, control mode is to be connected in 0 °~180 ° sections Each switch of the bridge arm subscript tail marked as 1, i.e. S11、S21.180 °~360 ° sections be connected each bridge arm subscript tails marked as 2 switches, i.e. S12、S22.There are enough dead times for each group of switch conduction.
According to the difference of power switch state, circuit can be divided into 3 kinds of working conditions：
(1) power switch is turned off, and is at this time dead time, all diodes are turned off, C1、C2It neither charges nor puts Electricity；All diodes are turned off.Because dead time is very of short duration, the influence of converter can be ignored not in the analysis process Meter.
(2) controller controls the second power switch S12, the 4th power switch S22Shutdown, the first power switch S11And third Power switch S21Conducting.Capacitance C at this time1Electric discharge, capacitance C2Charging.Inverter bridge leg exports positive level, the outflow of input power anode Electric current passes sequentially through switch S1, node 1, transformer T1Primary side Same Name of Ends and different name end, transformer T2Different name end and Same Name of Ends, Node 0 constitutes first side loop.Transformer T1Secondary side Same Name of Ends generates electric current and passes through D11Give capacitance C12Charging, gives Capacitance C11Electric discharge, electric current pass through diode D21To capacitance C22Capacitance C is given in charging21Electric discharge, electric current pass through diode D1To load RLPower supply, electric current flow through load and pass through diode D02Inflow transformer T2Secondary side Same Name of Ends forms first secondary side circuit, With transformer T2Primary side current direction is consistent.Similarly the positive electrode current of input power passes sequentially through switch S3, node 2, transformer T3 Primary side Same Name of Ends and different name end, transformer T4Different name end and Same Name of Ends, node 0 constitute side loop of Article 2.Transformer T3 Secondary side Same Name of Ends generates electric current and passes through diode D13Give capacitance C14Capacitance C is given in charging13Electric discharge, electric current pass through diode D23 To capacitance C24Charging；Give capacitance C23Electric discharge, electric current pass through diode D simultaneously3To load RLPower supply, electric current flow through load and pass through two Pole pipe D04Inflow transformer T4Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T4Primary side current direction one It causes.Diode D at this time2、D4、D01、D03、D12、D14、D22、D24It is turned off.
(3) controller controls the first power switch S11, third power switch S21Shutdown, the second power switch S12With the 4th Power switch S22Conducting.Capacitance C at this time1Charging, capacitance C2Electric discharge.Inverter bridge leg exports negative level, capacitance C2Discharge current is successively Pass through node 0, transformer T2Primary side Same Name of Ends and different name end, transformer T3Primary side different name end and Same Name of Ends, node 2, switch S22Constitute first side loop.Transformer T2Secondary side Same Name of Ends generates electric current and passes through D12Give capacitance C13Charging, to electricity Hold C12Electric discharge, electric current pass through diode D22To capacitance C23Capacitance C is given in charging22Electric discharge, electric current pass through diode D2To load RL Power supply, electric current flow through load and pass through diode D03Inflow transformer T3Secondary side Same Name of Ends forms first secondary side circuit, with Transformer T3Primary side current direction is consistent.Similarly capacitance C2Discharge current passes sequentially through node 0, transformer T4Primary side is of the same name End and different name end, transformer T1Primary side different name end and Same Name of Ends, node 1, switch S12Constitute side loop of Article 2.Transformation Device T4Secondary side Same Name of Ends generates electric current and passes through diode D14Give capacitance C11Capacitance C is given in charging14Electric discharge, electric current pass through two poles Pipe D24To capacitance C21Charging；Give capacitance C24Electric discharge, electric current pass through diode D simultaneously4To load RLPower supply, it is logical that electric current flows through load Cross diode D01Inflow transformer T1Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T1Primary side current side To consistent.Diode D at this time1、D3、D02、D04、D11、D13、D21、D23It is turned off.
Simulation parameter：Switching frequency f=50kHz, input voltage uin=400V, output voltage u0=600V, rated power P0=4800W, transformer voltage ratio k=1.It is input voltage u from Fig. 4in, output voltage u0Inverter bridge leg output voltage u1And capacitance C11、C12、C21、C22Voltage, it can be seen that as input voltage uinWhen the direct current of=400V, inverter bridge leg exports u1For amplitude The ac square wave of 200V, totally two kinds of level, the output DC voltage u by rear class rectification0=600V is the 3 of alternating current amplitude Times.It is inflow transformer T from Fig. 51、T2、T3、T4Electric current, it can be seen that the electric current for flowing through 4 transformers is equal, and power is equal Point, all phase automatic current equalizings.Fig. 5 is diode D11、D12Voltage and current waveform.Fig. 6 is diode D1、D2Voltage and electricity Flow waveform.
Flow principle：
By taking 1 gain unit in Fig. 3 as an example.When stable state, t0Moment, inverter bridge leg output voltage uinIt equivalent can become one Square-wave AC Power Source is begun to ramp up from negative level to positive level, since the rate of climb is very fast, it is believed that capacitance C11、C13It opens Begin electric discharge at the time of with capacitance C12、C14It is consistent at the time of starting to charge up.Diode D at this time11、D13、D1、D3、D02、D04Conducting, such as Fig. 3, this moment, uc11=uc13=u0-uin, uc12=uc14=uin。t1Moment (very fast to reach), capacitance C11、C13Voltage Start slowly to decline, capacitance C12、C14Voltage starts slowly to rise, and voltage change speed is very slow.t2Moment, at this time uc11、 uc12、uc13、uc14Variable quantity be enough to make diode D1、D11、D3、D13Shutdown.All diode shutdowns, capacitor charge and discharge Terminate.U in this periodinAnd u0Remain constant, under each module parameter unanimous circumstances, then the voltage on capacitance It remains unchanged, capacitance C11、C13Initial discharge moment and capacitance C12、C14The initiation of charge moment is consistent, as long as holding capacitor capacitance phase Deng the speed of voltage change is maintained for unanimously on that capacitance, C11、C13Discharge finish time and C12、C14Charging finishing time also one It causes.Since the capacitor charge and discharge quantity of electric charge balances in a cycle, it can be deduced that every quantity of electric charge all the way is consistent in a cycle , then it is equal per electric current all the way, thus releases per phase automatic current equalizing.uinFor negative level when it is similar with positive level.
It is similar that gain unit increases to n analysis situation.

Claims (3)

1. a kind of adjustable high boosting isolated form DC/DC converters of bridge arm number, it is characterised in that：Including 1 direct-current input power supplying, 2 input side filter capacitorsC 1、C 2,mA inverter bridge leg, each bridge arm include 2 power switch；Wherein rectification side shares 2m A no-load voltage ratio is 1：kHigh frequency transformer,nA gain unit, 4mA output diode D1、D2、D3...D2m 、D01、D02、 D03...D0(2m), 1 output filter capacitorC 0, 1 loadR L ；Include 2 in wherein each gain unitmA capacitanceC 11、C 12...C n(2m)With 2mA diode D11、D12...D n(2m)；mA bridge arm corresponds to 2mA the input phase carries transformation implement body connection side Formula is as follows：
Input side filter capacitorC 1Another terminationC 2One end, and the tie point is denoted as node 0,C 1One termination DC power anode,C 2 Another termination DC power cathode；In inverter bridge leg, every 2 power switch form a bridge arm, i.e. S11、S12Constitute Bridge 1 Arm, S11Drain electrode meets positive pole, S11Source electrode meets S12Drain electrode, and the tie point is denoted as node 1, S12Source electrode connects power cathode；S21、 S22Constitute Bridge 2 arm, S21Drain electrode meets positive pole, S21Source electrode meets S22Drain electrode, and the tie point is denoted as node 2, S22Source electrode connects Power cathode；And so on S m1、S m2Constitute themBridge arm, S m1Drain electrode meets positive pole, S m1Source electrode meets S m2Drain electrode, and the node It is denoted as nodem, S m2Source electrode connects power cathode；
Inverter bridge leg node 1,2,3...mTransformer T is met respectively1、T3、T5...T2m-1Primary side Same Name of Ends, node 0 connect transformer T2、T4、T6...T2m Primary side Same Name of Ends, all transformer primary side different name ends are sequentially connected；
nThe connection type of a gain unit is as follows：
Gain unit 1 is by 2mA capacitanceC 11、C 12...C 1(2m), 2mA diode D11、D12...D1(2m)It constitutes, in internal structure Diode D11Cathode connect capacitanceC 11One end, anode connects capacitanceC 12The other end, diode D12Cathode connect capacitanceC 12's One end, anode connect capacitanceC 13The other end ... diode D1(2m-1)Cathode connect capacitanceC 1(2m-1)One end, anode connects capacitanceC 1(2m)The other end, diode D1(2m)Cathode connect capacitanceC 1(2m)One end, anode connect capacitanceC 11The other end；
Gain unit 2 is by 2mA capacitanceC 21、C 22...C 2(2m), 2mA diode D21、D22...D2(2m)It constitutes, in internal structure Diode D21Cathode connect capacitanceC 21One end, anode connect capacitanceC 22The other end, diode D22Cathode connect capacitanceC 22One end, sun Pole connects capacitanceC 23The other end ... diode D2(2m-1)Cathode connect capacitanceC 2(2m-1)One end, anode connect capacitanceC 2(2m)The other end, two Pole pipe D2(2m)Cathode connect capacitanceC 2(2m)One end, anode connect capacitanceC 21The other end；
And so on arrive gain unitn；
Gain unitnBy 2mA capacitanceC n1、C n2...C nm , 2mA diode D n1、D n2...D n(2m)It constitutes, two in internal structure Pole pipe D n1Cathode connect capacitanceC n1One end, anode connect capacitanceC n2The other end, diode D n2Cathode connect capacitanceC n2One end, anode Even capacitanceC n3The other end ... diode D n(2m-1)Cathode connect capacitanceC n(2m-1)One end, anode connect capacitanceC n(2m)The other end, two poles Pipe D n(2m)Cathode connect capacitanceC n(2m)One end, anode connect capacitanceC n1The other end；
All Circuit Fault on Secondary Transformer different names end is sequentially connected；Capacitance in gain unit 1C 11、C 12...C 1(2m)One end connect change respectively Depressor T1、T2...T2m Secondary side Same Name of Ends, capacitance in gain unit 2C 21、C 22...C 2(2m)One end connect gain unit 1 respectively Middle capacitanceC 11、C 12...C 1(2m)The other end, capacitance in gain unit 3C 31、C 32...C 3(2m)One end connect gain unit 2 respectively Middle capacitanceC 21、C 22...C 2(2m)The other end ... gain unitnMiddle capacitanceC n1、C n2...C n(2m)One end connect gain list respectively MembernCapacitance in -1C (n-1)1、C (n-1)2...C (n-1)(2m)The other end, gain unitnMiddle capacitanceC n1、C n2...C n(2m)The other end Diode D is met respectively1、D2...D2m Cathode, diode D1、D2...D2m,Anode connect filter capacitorC 0And loadR L One end； Filter capacitorC 0And loadR L Another terminating diode D01、D02...D0(2m)Cathode, diode D01、D02...D0(2m)Sun Pole meets diode D in gain unit 1 respectively11、D12...D1(2m)Cathode.
2. the adjustable high boosting isolated form DC/DC converters of a kind of bridge arm number according to claim 1, it is characterised in that it is controlled Mode processed：For each switch of the bridge arm subscript tail marked as 1, i.e. S is connected in 0 ° ~ 180 ° sections11、S21...S m1；180 ° ~ Each bridge arm subscript tail is connected marked as 2 switches, i.e. S in 360 ° of sections12、S22...S m2；There are enough for each group of switch conduction Dead time.
3. the adjustable high boosting isolated form DC/DC converters of a kind of bridge arm number according to claim 1, it is characterised in that：
According to the difference of power switch state, circuit is divided into 3 kinds of working conditions：
（1）, power switch is turned off, be at this time dead time, all diodes are turned off,C 1、C 2It neither charges nor discharges； All diodes are turned off；Because dead time is very of short duration, the influence of converter can be ignored in the analysis process；
（2）, controller control the second power switch S12, the 4th power switch S22Shutdown, the first power switch S11With third power Switch S21Conducting；Capacitance at this timeC 1Electric discharge, capacitanceC 2Charging；Inverter bridge leg exports positive level, and input power anode flows out electric current Pass sequentially through switch S1, node 1, transformer T1Primary side Same Name of Ends and different name end, transformer T2Different name end and Same Name of Ends, node 0 Constitute first side loop；Transformer T1Secondary side Same Name of Ends generates electric current and passes through D11To capacitanceC 12Capacitance is given in chargingC 11Electric discharge, electric current pass through diode D21To capacitanceC 22Capacitance is given in chargingC 21Electric discharge, electric current pass through diode D1To loadR L For Electricity, electric current flow through load and pass through diode D02Inflow transformer T2Secondary side Same Name of Ends forms first secondary side circuit, with change Depressor T2Primary side current direction is consistent；Similarly the positive electrode current of input power passes sequentially through switch S3, node 2, transformer T3Once Side Same Name of Ends and different name end, transformer T4Different name end and Same Name of Ends, node 0 constitute side loop of Article 2；Transformer T3It is secondary Side Same Name of Ends generates electric current and passes through diode D13To capacitanceC 14Capacitance is given in chargingC 13Electric discharge, electric current pass through diode D23To electricity HoldC 24Charging；To capacitanceC 23Electric discharge, electric current pass through diode D simultaneously3To loadR L Power supply, electric current flow through load and pass through diode D04Inflow transformer T4Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T4Primary side current direction is consistent； Diode D at this time2、D4、D01、D03、D12、D14、D22、D24It is turned off；
Controller controls the first power switch S11, third power switch S21Shutdown, the second power switch S12With the 4th power switch S22Conducting；Capacitance at this timeC 1Charging, capacitanceC 2Electric discharge；Inverter bridge leg exports negative level, capacitanceC 2Discharge current passes sequentially through node 0, transformer T2Primary side Same Name of Ends and different name end, transformer T3Primary side different name end and Same Name of Ends, node 2, switch S22It constitutes First side loop；Transformer T2Secondary side Same Name of Ends generates electric current and passes through D12To capacitanceC 13Capacitance is given in chargingC 12It puts Electricity, electric current pass through diode D22To capacitanceC 23Capacitance is given in chargingC 22Electric discharge, electric current pass through diode D2To loadR L Power supply, electricity Stream flows through load and passes through diode D03Inflow transformer T3Secondary side Same Name of Ends forms first secondary side circuit, with transformer T3 Primary side current direction is consistent；Similarly capacitanceC 2Discharge current passes sequentially through node 0, transformer T4Primary side Same Name of Ends and different name End, transformer T1Primary side different name end and Same Name of Ends, node 1, switch S12Constitute side loop of Article 2；Transformer T4It is secondary Side Same Name of Ends generates electric current and passes through diode D14To capacitanceC 11Capacitance is given in chargingC 14Electric discharge, electric current pass through diode D24To electricity HoldC 21Charging；To capacitanceC 24Electric discharge, electric current pass through diode D simultaneously4To loadR L Power supply, electric current flow through load and pass through diode D01Inflow transformer T1Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T1Primary side current direction is consistent； Diode D at this time1、D3、D02、D04、D11、D13、D21、D23It is turned off.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203800680U (en) * 2014-05-08 2014-08-27 中国电子科技集团公司第十四研究所 Large power bidirectional deflector capable of supporting access of multiple cell groups
CN204131408U (en) * 2014-09-24 2015-01-28 华中科技大学 A kind of MMC type commutator transformer based on multi winding transformer coupling
CN106787723A (en) * 2016-12-29 2017-05-31 三峡大学 A kind of multi input boosting DC/DC converters high

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203800680U (en) * 2014-05-08 2014-08-27 中国电子科技集团公司第十四研究所 Large power bidirectional deflector capable of supporting access of multiple cell groups
CN204131408U (en) * 2014-09-24 2015-01-28 华中科技大学 A kind of MMC type commutator transformer based on multi winding transformer coupling
CN106787723A (en) * 2016-12-29 2017-05-31 三峡大学 A kind of multi input boosting DC/DC converters high

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Application publication date: 20180928

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Denomination of invention: A High Boost Isolation DC/DC Converter with Adjustable Number of Bridge Arms

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