CN108599579A - A kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number - Google Patents

A kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number Download PDF

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Publication number
CN108599579A
CN108599579A CN201810575177.2A CN201810575177A CN108599579A CN 108599579 A CN108599579 A CN 108599579A CN 201810575177 A CN201810575177 A CN 201810575177A CN 108599579 A CN108599579 A CN 108599579A
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capacitance
diode
switch
cathode
transformer
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CN108599579B (en
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邾玢鑫
王寒
刘崧
黄悦华
佘小莉
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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
    • 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
    • H02M3/285—Single converters with a plurality of output stages connected in parallel
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The present invention proposes a kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number, contains if setting the adjustable three level height 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, each bridge arm include 4 power switch and 2 diodes, and bridge arm connects DC power supply in both sides up and down, and 2mA 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 three level 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 can be adjusted according to gain unit quantity, diode 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 three level height 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 three level height boosting of bridge arm number every Release DC/DC converters.
Background technology
Traditional diode bridge rectifier and three-level inverter is widely used, but one input and output gain is relatively low, It is difficult to be competent to the higher occasion of input and output voltage gain requirement；Secondly rectification side diode voltage, current stress are high, make It is higher with device cost；Thirdly the inverter side input number of phases is unadjustable, used in high current occasion limited.At this stage, with sea The capacity of upper wind power plant constantly expands, and offshore distance is more and more remoter, and the advantage of direct current confluence and transmission of electricity gradually highlights.Three level are inverse Become device because switching device voltage stress is low be considered as in direct current confluence input side inverter circuit preferably select, switch can be made Tube voltage stress is reduced to the half of input voltage, while the ac power waveform sinusoidal pattern exported is more preferable.But it is suggested plans at present It is non-adjustable to be limited to its input number of phases, and there is a problem of that device current stress is excessively high.
And higher voltage output may be implemented in rectification side voltage doubling rectifing circuit, but it 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, according to multiple defeated Entering to be in parallel and is difficult to equilibrium assignment there are power between each phase, each device current stress and fever are uneven in system, Reliability and service life are a greater impact.
Invention content
For deficiencies of the prior art, the irreconcilable multiplication of voltage of the number of phases is inputted to solve existing three-level inverter Flow difficult problem when rectification circuit Multiphase Parallel, the present invention propose it is a kind of can automatic current equalizing adjustable three level of bridge arm number it is high Boost isolated form DC/DC converters.
The present invention adopts the following technical scheme that：
A kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number, including 1 direct-current input power supplying, 2 Input side filter capacitor C1、C2, m tri-level inversion bridge arm, 2m no-load voltage ratio is 1：The high frequency transformer of k, n gain unit, 4m A output diode D1、D2、D3...D2m、D01、D02、D03...D0(2m), 1 output filter capacitor C0, 1 load RL.It is wherein every Include 2m capacitance C in a gain unit11、C12...Cn(2m)With m diode D11、D12...Dn(2m).Each tri-level inversion Bridge arm includes 4 power switch and 2 diodes.M bridge arm corresponds to 2m the input phase, the specific connection side of carried converter Formula is as follows：
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 three level bridge arms, every 4 power switch and 2 diodes form a bridge arm, That is S11、S12、S13、S14、Db11、Db12Constitute Bridge 1 arm, S11Drain electrode meets positive pole, S11Source electrode meets S12Drain electrode and diode Db11 Cathode, S12Source electrode meets S13Drain electrode, and the tie point is denoted as node 1, S13Source electrode meets S14Drain electrode and diode Db12Anode, S14 Source electrode meets power cathode, diode Db11Anode meet diode Db12Cathode and node 0.S21、S22、S23、S24、Db21、Db22Structure At Bridge 2 arm, S21Drain electrode meets positive pole, S21Source electrode meets S22Drain electrode and diode Db21Cathode, S22Source electrode meets S23Drain electrode, and The tie point is denoted as node 2, S23Source electrode meets S24Drain electrode and diode Db22Anode, S24Source electrode meets power cathode, diode Db21 Anode meet diode Db22Cathode and node 0.And so on Sm1、Sm2、Sm3、Sm4、Dbm1、Dbm2Constitute m bridge arms, Sm1Leakage Pole meets positive pole, Sm1Source electrode meets Sm2Drain electrode and diode Dbm1Cathode, Sm2Source electrode meets Sm3Drain electrode, and the tie point is denoted as node M, Sm3Source electrode meets Sm4Drain electrode and diode Dbm2Anode, Sm4Source electrode meets power cathode, diode Dbm1Anode connect diode Dbm2Cathode and node 0.
Three level bridge arm nodes 1,2,3...m meet transformer T respectively1、T3、T5...T2m-1Primary side Same Name of Ends, node 0 connect Transformer 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...T(2m)Secondary side Same Name of Ends, capacitance C in gain unit 221、C22...C2(2m)One end connect gain respectively Capacitance C in unit 111、C12...C1(2m)The other end, capacitance C in gain unit 331、C32...C3(2m)One end connect gain respectively Capacitance C in unit 221、C22...C2(2m)The other end ... gain unit n in capacitance Cn1、Cn2...Cn(2m)One end connect increasing respectively Capacitance C in beneficial 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 One end meets diode D respectively1、D2...D2mCathode, diode D1、D2...D2mAnode meet filter capacitor C0With load RL's One end.Filter capacitor C0With load RLAnother terminating diode D01、D02...D0(2m)Cathode, diode D01、D02...D0(2m) Anode meet diode D in gain unit 1 respectively11、D12...D1(2m)Cathode.
A kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number, control mode are：In 0 °~90 ° areas Between each switch of the bridge arm subscript tail marked as 1,2, i.e. S is connected11、S12, S21、S22...Sm1、Sm2.It is led in 90 °~180 ° sections Lead to each switch of the bridge arm subscript tail marked as 2,3, i.e. S12、S13, S22、S23...Sm2、Sm3.It is connected in 180 °~270 ° sections Each switch of the bridge arm subscript tail marked as 3,4, i.e. S13、S14, S23、S24...Sm3、Sm4.It is every in 270 °~360 ° section conductings A switch of the bridge arm subscript tail marked as 2,3, i.e. S12、S13, S22、S23...Sm2、Sm3.There are enough for each group of switch conduction Dead time.
A kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number of the present invention, technique effect are as follows：
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 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 tri-level inversion bridge arm 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.Three level bridge arm numbers are adjusted to adjust the input number of phases, per phase and rectification side two The current stress of pole pipe can change accordingly.
4, the output gain of rectification side improves, and high boosting can be achieved the purpose that using the transformer of relatively low no-load voltage ratio, is become The design difficulty of depressor substantially reduces.Using tri-level inversion bridge arm, the voltage stress of switching tube is reduced to the one of input voltage Half, and inverter output AC electricity level containing there are three types of, closer to sine wave.
Description of the drawings
Fig. 1 is circuit theory total figure of the present invention.
Fig. 2 is adjustable three level height boosting isolated form DC/DC 2, the converter gain units of bridge arm 2 of the bridge arm number Topological diagram.
Fig. 3 is to flow principle analysis figure.
When Fig. 4 is converter m=2, n=2, input voltage uin, output voltage u0, tri-level inversion bridge arm output voltage u1Simulation waveform.
When Fig. 5 is converter m=2, n=2, transformer T1、T2、T3、T4Electric current and diode D11、D12The emulation of electric current Oscillogram.
Fig. 6 is diode D1、D2Electric current and diode D11、D12The simulation waveform of voltage.
Fig. 7 is diode D1、D2Voltage and capacitance C11、C12、C21、C22The simulation waveform of voltage.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings.
The isolated form DC/DC converters as shown in Fig. 2, three level height of 2 bridge arms boost, it includes 1 direct current input electricity Source, 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 output filter capacitor C0, 1 load RL.Include 4 capacitances and 4 diodes in wherein each gain unit.Each tri-level inversion bridge arm includes that 4 power are opened It closes and 2 diodes.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 three level bridge arms, every 4 power switch and 2 diodes form a bridge arm, That is S11、S12、S13、S14、Db11、Db12Constitute Bridge 1 arm, S11Drain electrode meets positive pole, S11Source electrode meets S12Drain electrode and diode Db11 Cathode, S12Source electrode meets S13Drain electrode, and the tie point is denoted as node 1, S13Source electrode meets S14Drain electrode and diode Db12Anode, S14 Source electrode meets power cathode, diode Db11Anode meet diode Db12Cathode and node 0.S21、S22、S23、S24、Db21、Db22Structure At Bridge 2 arm, S21Drain electrode meets positive pole, S21Source electrode meets S22Drain electrode and diode Db21Cathode, S22Source electrode meets S23Drain electrode, and The tie point is denoted as node 2, S23Source electrode meets S24Drain electrode and diode Db22Anode, S24Source electrode meets power cathode, diode Db21 Anode meet diode Db22Cathode and node 0.Three level bridge arm nodes 1,2 meet transformer T respectively1、T3Primary side Same Name of Ends, Node 0 meets 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 three level height boosting isolated form DC/DC converters of 2 bridge arms, control mode is in 0 °~90 ° areas Between each switch of the bridge arm subscript tail marked as 1,2, i.e. S is connected11、S12, S21、S22.Each bridge is connected in 90 °~180 ° sections Switch of the arm subscript tail marked as 2,3, i.e. S12、S13, S22、S23.Each bridge arm subscript tail tag number is connected in 180 °~270 ° sections For 3,4 switch, i.e. S13、S14, S23、S24.Each switch of the bridge arm subscript tail marked as 2,3 is connected in 270 °~360 ° sections, That is S12、S13, S22、S23.There are enough dead times for each group of switch conduction.
According to the difference of power switch state, circuit can be divided into 4 kinds of working conditions：
(1) controller control switch S11, switch S12, switch S21, switch S22Conducting, switch S13, switch S14, switch S23、 Switch S24Shutdown, the positive level of inverter bridge leg output at this time.Capacitance C at this time1Electric discharge, capacitance C2Charging.Input power anode flows out Electric current passes sequentially through switch S11、S12, node 1, transformer T1Primary side Same Name of Ends and different name end, transformer T2Different name end and of the same name End, node 0 constitute first side loop.Transformer T1Secondary side Same Name of Ends generates electric current and passes through D11Give capacitance C12It fills Electricity 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 and returns Road, with transformer T2Primary side current direction is consistent.Similarly the positive electrode current of input power passes sequentially through switch S21, switch S22, section Point 2, transformer T3Primary side Same Name of Ends and different name end, transformer T4Different name end and Same Name of Ends, node 0 constitute Article 2 primary side Circuit.Transformer T3Secondary side Same Name of Ends generates electric current and passes through diode D13Give capacitance C14Capacitance C is given in charging13Electric discharge, electricity Stream passes through diode D23To capacitance C24Charging；Give capacitance C23Electric discharge, electric current pass through diode D simultaneously3To load RLPower supply, electric current It flows through load and passes through diode D04Inflow transformer T4Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T4One Secondary side current direction is consistent.Diode D at this time2、D4、D01、D03、D12、D14、D22、D24It is turned off.
(2) controller control switch S12, switch S13, switch S22, switch S23Conducting, switch S11, switch S14, switch S21、 Switch S24Shutdown, 0 level of inverter bridge leg output at this time.All diodes are turned off at this time, and all capacitances neither charge nor put Electricity.
(3) controller control switch S13, switch S14, switch S23, switch S24Conducting, switch S11, switch S12, switch S21、 Switch S22Shutdown, the negative level of inverter bridge leg output at this time.Capacitance C1Charging, capacitance C2Electric discharge.Capacitance C2Electric discharge passes sequentially through node 0, transformer T2Same Name of Ends and different name end transformer, T3Primary side different name end and Same Name of Ends, node 2, switch S23, switch S24, electricity Source cathode forms first side loop.Transformer T2Secondary side Same Name of Ends generates electric current and passes through D12Give capacitance C13Charging, Give capacitance C12Electric discharge, electric current pass through diode D22To capacitance C23Capacitance C is given in charging22Electric discharge, electric current pass through diode D2To negative Carry RLPower supply, electric current flow through load and pass through diode D03Inflow transformer T3Secondary side Same Name of Ends forms first secondary side and returns Road, with transformer T3Primary side current direction is consistent.Similarly capacitance C2Electric discharge passes sequentially through node 0, transformer T4Same Name of Ends and different Name end transformer, T1Primary side different name end and Same Name of Ends, node 1, switch S13, switch S14, power cathode, formed Article 2 it is primary Side loop.Transformer T4Secondary side Same Name of Ends generates electric current and passes through diode D14Give capacitance C11Capacitance C is given in charging14Electric discharge, Electric current passes through diode D24To capacitance C21Charging；Give capacitance C24Electric discharge, electric current pass through diode D simultaneously4To load RLPower supply, electricity Stream flows through load and passes through diode D01Inflow transformer T1Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T1 Primary side current direction is consistent.Diode D at this time1、D3、D02、D04、D11、D13、D21、D23It is turned off.
(4) controller control switch S12, switch S13, switch S22, switch S23Conducting, switch S11, switch S14, switch S21、 Switch S24Shutdown, 0 level of inverter output at this time.All diodes are turned off at this time, and all capacitances neither charge nor discharge.
Simulation parameter：Switching frequency f=50kHz, input voltage uin=400V, output voltage u0=600V, rated power P0=4800W, transformer voltage ratio k=1.From fig. 4, it can be seen that working as input voltage uinWhen the direct current of=400V, three level are inverse Become bridge arm and exports u1For the ladder ac square wave of amplitude 200V, totally three kinds of level, the output DC voltage u by rear class rectification0= 600V is 3 times of alternating current amplitude.It is inflow transformer T from Fig. 51、T2Electric current, diode D11、D12Current waveform, can To find out, the electric current for flowing through 4 transformers is equal, power-sharing, all phase automatic current equalizings.Fig. 5 is diode D1、D2Current wave Shape and diode D11、D12Voltage waveform.Fig. 6 is diode D1、D2Voltage waveform and rectification lateral capacitance C11、C12、C21、C22 Voltage waveform.
Flow principle：
By taking 1 gain unit in Fig. 3 as an example.When stable state, t0Moment, tri-level inversion bridge arm output voltage uinCan it is equivalent at For a three-level AC galvanic electricity source, begun to ramp up from 0 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.When exporting 0 level, all diode shutdowns, all capacitances neither charge nor discharge inverter, when exporting negative level It is symmetrical with the process of positive level.Since the capacitor charge and discharge quantity of electric charge balances in a cycle, it can be deduced that each in a cycle The quantity of electric charge on road is consistent, then is equal per electric current all the way, thus releases per phase automatic current equalizing.
It is similar that gain unit increases to n analysis situation.

Claims (3)

  1. The isolated form DC/DC converters 1. a kind of adjustable three level height of bridge arm number boosts, it is characterised in that：Including 1 direct current is defeated Enter power supply, 2 input side filter capacitorsC 1、C 2,mA tri-level inversion bridge arm, 2mA no-load voltage ratio is 1：kHigh frequency transformer,nIt is a Gain unit, 4mA output diode D1、D2、D3...D2m 、D01、D02、D03...D0(2m), 1 output filter capacitorC 0, 1 negative It carriesR L ；Include 2 in wherein each gain unitmA capacitanceC 11、C 12...C n(2m)WithmA diode D11、D12...D n(2m)；Each Tri-level inversion bridge arm includes 4 power switch and 2 diodes；mA bridge arm corresponds to 2mA the input phase, connection type is such as Under：
    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 three level bridge arms, every 4 power switch and 2 diodes form a bridge arm, i.e. S11、 S12、S13、S14、Db11、Db12Constitute Bridge 1 arm, S11Drain electrode meets positive pole, S11Source electrode meets S12Drain electrode and diode Db11Cathode, S12Source electrode meets S13Drain electrode, and the tie point is denoted as node 1, S13Source electrode meets S14Drain electrode and diode Db12Anode, S14 Source electrode connects Power cathode, diode Db11Anode meet diode Db12Cathode and node 0；S21、S22、S23、S24、Db21、Db22Constitute the 2nd Bridge arm, S21Drain electrode meets positive pole, S21Source electrode meets S22Drain electrode and diode Db21Cathode, S22Source electrode meets S23Drain electrode, and the connection Point is denoted as node 2, S23Source electrode meets S24Drain electrode and diode Db22Anode, S24 Source electrode meets power cathode, diode Db21Sun Pole meets diode Db22Cathode and node 0；And so on S m1、S m2、S m3、S m4、Dbm1、Dbm2Constitute themBridge arm, S m1Drain electrode connects Positive pole, S m1Source electrode meets S m2Drain electrode and diode Dbm1Cathode, S m2Source electrode meets S m3Drain electrode, and the tie point is denoted as nodem, S m3Source electrode meets S m4Drain electrode and diode Dbm2Anode, S m4Source electrode meets power cathode, diode Dbm1Anode meet diode Dbm2 Cathode and node 0；
    Three level bridge arm nodes 1,2,3...mTransformer T is met respectively1、T3、T5...T2m-1Primary side Same Name of Ends, node 0 connect transformation Device 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 0With load RLAnother 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. 2. a kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number, feature exist according to claim 1 In control mode is：Each switch of the bridge arm subscript tail marked as 1,2, i.e. S is connected in 0 ° ~ 90 ° sections11、S12, S21、 S22...S m1、S m2；Each switch of the bridge arm subscript tail marked as 2,3, i.e. S is connected in 90 ° ~ 180 ° sections12、S13, S22、 S23...S m2、S m3；Each switch of the bridge arm subscript tail marked as 3,4, i.e. S is connected in 180 ° ~ 270 ° sections13、S14, S23、 S24...S m3、S m4；Each switch of the bridge arm subscript tail marked as 2,3, i.e. S is connected in 270 ° ~ 360 ° sections12、S13, S22、 S23...S m2、S m3；There are enough dead times for each group of switch conduction.
  3. 3. a kind of adjustable three level height boosting isolated form DC/DC converters of bridge arm number, feature exist according to claim 1 In：
    According to the difference of power switch state, circuit is divided into 4 kinds of working conditions：
    （1）, controller control switch S11, switch S12, switch S21, switch S22Conducting, switch S13, switch S14, switch S23, switch S24Shutdown, the positive level of inverter bridge leg output at this time；Capacitance at this timeC 1Electric discharge, capacitanceC 2Charging；Input power anode flows out electric current Pass sequentially through switch S11、S12, 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 D11To capacitanceC 12Charging, gives CapacitanceC 11Electric discharge, electric current pass through diode D21To capacitanceC 22Capacitance is given in chargingC 21Electric discharge, electric current pass through diode D1To loadR L Power 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 S21, switch S22, node 2, Transformer T3Primary 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 T3Secondary 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 capacitanceC 24Charging；To capacitanceC 23Electric discharge, electric current pass through diode D simultaneously3To loadR L Power supply, electric current flows through negative It carries and passes through diode D04Inflow transformer T4Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T4Primary side electricity It is consistent to flow direction；Diode D at this time2、D4、D01、D03、D12、D14、D22、D24It is turned off；
    （2）, controller control switch S12, switch S13, switch S22, switch S23Conducting, switch S11, switch S14, switch S21, switch S24Shutdown, 0 level of inverter bridge leg output at this time；All diodes are turned off at this time, and all capacitances neither charge nor discharge；
    Controller controls switch S13, switch S14, switch S23, switch S24Conducting, switch S11, switch S12, switch S21, switch S22It closes Disconnected, inverter bridge leg exports negative level at this time；CapacitanceC 1Charging, capacitanceC 2Electric discharge；CapacitanceC 2Electric discharge passes sequentially through node 0, transformer T2Same Name of Ends and different name end transformer, T3Primary side different name end and Same Name of Ends, node 2, switch S23, switch S24, power cathode, shape At first side loop；Transformer T2Secondary side Same Name of Ends generates electric current and passes through D12To capacitanceC 13Capacitance is given in chargingC 12 Electric discharge, electric current pass through diode D22To capacitanceC 23Capacitance is given in chargingC 22Electric discharge, electric current pass through diode D2To loadR L Power supply, Electric current flows through load and passes through diode D03Inflow transformer T3Secondary side Same Name of Ends forms first secondary side circuit, with transformer T3Primary side current direction is consistent；Similarly capacitanceC 2Electric discharge passes sequentially through node 0, transformer T4Same Name of Ends and different name end transformer, T1Primary side different name end and Same Name of Ends, node 1, switch S13, switch S14, power cathode, formed side loop of Article 2；Transformation Device T4Secondary 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 two poles Pipe D24To capacitanceC 21Charging；To capacitanceC 24Electric discharge, electric current pass through diode D simultaneously4To loadR L Power 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；
    （4）, controller control switch S12, switch S13, switch S22, switch S23Conducting, switch S11, switch S14, switch S21, switch S24Shutdown, 0 level of inverter output at this time；All diodes are turned off at this time, and all capacitances neither charge nor discharge.
CN201810575177.2A 2018-06-06 2018-06-06 Three-level high-boost isolation type DC/DC converter with adjustable bridge arm number Active CN108599579B (en)

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Publication number Priority date Publication date Assignee Title
CN106533173A (en) * 2016-12-29 2017-03-22 三峡大学 High-gain DC/DC converter with adjustable input phase number
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
US20170324347A1 (en) * 2016-05-05 2017-11-09 Hong Kong Productivity Council Soft-switching bidirectional phase-shift converter with extended load range

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170324347A1 (en) * 2016-05-05 2017-11-09 Hong Kong Productivity Council Soft-switching bidirectional phase-shift converter with extended load range
CN106533173A (en) * 2016-12-29 2017-03-22 三峡大学 High-gain DC/DC converter with adjustable input phase number
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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