CN108631605A - A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number - Google Patents

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

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Publication number
CN108631605A
CN108631605A CN201810574377.6A CN201810574377A CN108631605A CN 108631605 A CN108631605 A CN 108631605A CN 201810574377 A CN201810574377 A CN 201810574377A CN 108631605 A CN108631605 A CN 108631605A
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China
Prior art keywords
diode
capacitance
switch
anode
transformer
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CN201810574377.6A
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Chinese (zh)
Inventor
邾玢鑫
丁峰
余志林
佘小莉
王寒
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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Priority to CN201810574377.6A priority Critical patent/CN108631605A/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
    • H02M1/38—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

Abstract

The present invention proposes a kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number.If setting the converter to containmA bridge arm, 2mA input number of phases,nA gain unit, then its composition is as follows：One DC input voitage source,mA bridge arm, each bridge arm include 4 power switch and 2 diodes, and both sides connect DC power supply, while two capacitances in parallel to bridge arm up and downC 1、C 2；2mA no-load voltage ratio is 1：nHigh frequency transformerT 1、T 2、T 3...T 2m , transformer right end hasnA high boosting gain unit, loadR L , filter capacitorC 0And diode D0, gain unit 1 contains 2 in each high boosting gain unitm1 capacitance and diode, remaining gain unit contain 2mA capacitance and diode.Compared to existing three-level converter, it is freely adjustable that the converter inputs the number of phases, the electric current of each the input phase can automatic current equalizing, so that the control strategy of converter is simple, input and output high gain and adjustable, switching device voltage and current stress are low and also adjustable, 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 three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number
Technical field
The large capacity that the present invention relates to a kind of based on bridge-type, high boosting DC/DC converters, specifically a kind of bridge arm number is adjustable Large capacity height boost three level isolated form DC/DC converters.
Background technology
In recent years, offshore wind farm direct current converges and technology of transmission of electricity is because wind power plant scale constantly expands, and offshore distance constantly increases Add and receives more and more researchs and concern.Three-level inverter is considered as that direct current converges because switching device voltage stress is low Input side inverter circuit preferably selects in stream, but suggest plans at present be limited to its input number of phases it is non-adjustable, device current is answered The excessively high problem of power.Traditional three-level inverter is widely used with diode bridge rectifier, but one side output voltage increases Benefit often realized by expanding the turn ratio of transformer primary and secondary winding, and the design of the high turn ratio high frequency transformer of large capacity with Manufacture difficulty is big, is difficult to be competent to the higher occasion of input and output voltage gain requirement；Another aspect inverter the input phase Number is unadjustable, inputs in occasion and is difficult to be utilized in high current.
Invention content
To solve in the prior art, the three-level inverter input number of phases is non-adjustable, voltage and current stress is excessively high, input and output The problem that gain is low and rectification side diode voltage stress is high, the present invention provide the adjustable large capacity height boosting of a kind of bridge arm number three Level isolated form DC/DC converters.
The technical solution that the present invention takes is:
A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number, which includes one Multiphase three-level inverter, 1 direct-current input power supplying, 2m the input phase, 2m no-load voltage ratio are 1：The high frequency transformer of N, n gain Unit, an output diode D0, an output filter capacitor C0, load RL.Wherein：
The multiphase three-level inverter includes：M tri-level inversion bridge arm, two input side filter capacitor C1、C2, 4m A power switch S11、S12、S13、S14、S21、S22、S23、S24...Sm1、Sm2、Sm3、Sm4, 2m diode Db11、Db12、Db21、 Db22...Dbm1、Dbm2.Capacitance C1The other end, C2The node definition that is connected with even number transformer primary side of one end be node 0, switching tube S12Source electrode, S13Drain electrode and transformer T1The connected node definition of primary side is node 1, switching tube S22Source Pole, S23Drain electrode and transformer T3The connected node definition of primary side be node 2 ..., and so on, switching tube Sm2Source electrode, Sm3Drain electrode and transformer T2m-1The connected node definition of primary side is node m.Specifically connection type is：Direct-current input power supplying Anode and capacitance C1One end links together, while the switching tube S for being 1 with subscript mantissa11、S21、S31...Sm1Drain electrode connection Together, the cathode of direct-current input power supplying and capacitance C2The other end link together, while with subscript mantissa be 4 switching tube S14、S24...Sm4Source electrode link together.Capacitance C1Another termination capacitor C2One end, switching tube S11Source electrode connect switch Pipe S12Drain electrode, while with diode Db11Cathode be connected, switching tube S12Source electrode meet switching tube S13Drain electrode, switching tube S13Source electrode meet switching tube S14Drain electrode, while with diode Db12Anode be connected, diode Db12Cathode and diode Db11Anode be connected, while with diode Db21Anode and node 0 be connected.Switching tube S21Source electrode meet switching tube S22's Drain electrode, at the same with diode Db21Cathode be connected, switching tube S22Source electrode meet switching tube S23Drain electrode, switching tube S23Source electrode Meet switching tube S24Drain electrode, while with diode Db22Anode be connected, diode Db22Cathode and diode Db21Anode phase Even, at the same with diode Db31Anode be connected ..., and so on, switching tube Sm-11Source electrode meet switching tube Sm-12Drain electrode, Simultaneously with diode Dbm-11Cathode be connected, switching tube Sm-12Source electrode meet switching tube Sm-13Drain electrode, switching tube Sm-13Source electrode Meet switching tube Sm-14Drain electrode, while with diode Dbm-12Anode be connected, diode Dbm-12Cathode and diode Dbm-11's Anode be connected, while with diode Dbm1Anode be connected.Switching tube Sm1Source electrode meet switching tube Sm2Drain electrode, while with two poles Pipe Dbm1Cathode be connected, switching tube Sm2Source electrode meet switching tube Sm3Drain electrode, switching tube Sm3Source electrode meet switching tube Sm4Leakage Pole, at the same with diode Dbm2Anode be connected, diode Dbm2Cathode and diode Dbm1Anode be connected.
The specific connection type of the multiphase three-level inverter and transformer is：Transformer T1One terminated nodes of primary side 1, transformer T3One terminated nodes 2 of primary side, and so on to 2m-1 phases, transformer T2m-1One terminated nodes m of primary side becomes Depressor T2、T4、...、T2mPrimary side one end connects node 0.The another of each transformer primary side terminates to together, secondary side it is another One end is also connected together.
The gain unit 1 includes：Diode D21、D31、D41...D2m1, capacitance C21、C31、C41...C2m1.It specifically connects The mode of connecing is：Diode D21Cathode meet capacitance C21One end, while with diode D31Anode be connected, diode D31The moon Pole meets capacitance C31One end, while with diode D41Anode be connected ..., and so on, diode D2m-11Cathode connect electricity Hold C2m-11One end, while with diode D2m1Anode be connected, diode D2m1Cathode meet capacitance C2m1One end.
The gain unit 2 includes：Diode D12、D22、D32...D2m2, capacitance C12、C22、C32...C2m2.It specifically connects The mode of connecing is：Diode D12Cathode meet capacitance C12One end, while with diode D22Anode be connected, diode D22The moon Pole meets capacitance C22One end, while with diode D32Anode be connected ..., and so on diode D2m-12Cathode connect capacitance C2m-12One end, while with diode D2m2Anode be connected, diode D2m2Cathode meet capacitance C2m2One end.
The gain unit 3 includes：Diode D13、D23、D33...D2m3, capacitance C13、C23、C33...C2m3.It specifically connects The mode of connecing is：Diode D13Cathode meet capacitance C13One end, while with diode D23Anode be connected, diode D23The moon Pole meets capacitance C23One end, while with diode D33Anode be connected ..., and so on diode D2m-13Cathode connect capacitance C2m-13One end, while with diode D2m3Anode be connected, diode D2m3Cathode meet capacitance C2m3One end.
...
And so on, the gain unit n includes：Diode D1n、D2n、D3n...D2mn, capacitance C1n、C2n、 C3n...C2mn.Its specific connection type is：Diode D1nCathode meet capacitance C1nOne end, while with diode D2nAnode It is connected, diode D2nCathode meet capacitance C2nOne end, while with diode D3nAnode be connected ..., and so on two poles Pipe D2m-1nCathode meet capacitance C2m-1nOne end, while with diode D2mnAnode be connected, diode D2mnCathode connect capacitance C2mnOne end.
It is between the gain unit and with the specific connection type of transformer and other components：Transformer T1It is secondary Side one terminates diode D in gain unit 121Anode and output filter capacitor COWith load RLThe other end, while with increasing Capacitance C in beneficial unit 212, capacitance C in gain unit 313..., capacitance C in gain unit n1nThe other end be connected, transformer T2 Secondary side one terminates capacitance C in gain unit 121, capacitance C in gain unit 222..., capacitance C in gain unit n2nIt is another End is connected, transformer T3Secondary side one terminates capacitance C in gain unit 131, capacitance C in gain unit 232..., gain unit n Middle capacitance C3nThe other end be connected ..., and so on, transformer T2mSecondary side one terminates capacitance C in gain unit 12m1, increase Capacitance C in beneficial unit 22m2..., capacitance C in gain unit n2mnThe other end be connected.Diode D in gain unit 12m1Cathode With capacitance C2m1Node between one end and diode D in gain unit 212Anode be connected, diode D in gain unit 22m2It is cloudy Pole and capacitance C2m2Node between one end and diode D in gain unit 313Anode be connected ..., and so on, gain list Diode D in first n-12mn-1Cathode and capacitance C2mn-1Node between one end and diode D in gain unit n1nAnode phase Even, diode D in gain unit n2mnCathode and capacitance C2mnNode between one end and diode DOAnode is connected.Load RLWith C0Parallel connection loads RLOne terminating diode D0Cathode.
A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number, control mode is at 0 ° Each switch of the bridge arm subscript tail marked as 1,2, i.e. S is connected in~90 ° of sections11、S12, S21、S22...Sm1、Sm2.90 °~ Each switch of the bridge arm subscript tail marked as 2,3, i.e. S is connected in 180 ° of sections12、S13, S22、S23...Sm2、Sm3.180 °~ Each switch of the bridge arm subscript tail marked as 3,4, i.e. S is connected in 270 ° of sections13、S14, S23、S24...Sm3、Sm4.270 °~ Each switch of the bridge arm subscript tail marked as 2,3, i.e. S is connected in 360 ° of sections12、S13, S22、S23...Sm2、Sm3.Each group of switch There are enough dead times for conducting.
A kind of bridge arm number of the present invention three level isolated form DC/DC converters of adjustable large capacity height boosting, technique effect is such as Under：
1, input and output high gain and adjustable, switching device voltage current stress is low and adjustable.Wherein：
The ratio of output voltage and input voltage is (zero load)：
The voltage stress of diode is：
M is the input number of phases, and n is mould diode in the block and capacitance quantity.N is transformer parameter ratio.
2, automatic current equalizing can be achieved between each the input phase, control strategy and driving circuit are simple.
3, using three-level inverter, output alternating current 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 the circuit topology figure of of the invention 2 bridge arms, 2 gain units.
Fig. 3 is input voltage Uin of the present invention, output voltage Uo, tri-level inversion bridge arm output voltage U1Simulation waveform Figure.
Fig. 4 is transformer T of the present invention1、T2、T3、T4The simulation waveform of electric current.
Fig. 5 is diode D of the present invention1、D2Current Voltage simulation waveform.
Fig. 6 is capacitance C of the present invention21~C42Voltage oscillogram.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings.
The three level isolated form DC/DC converters as shown in Fig. 2, a kind of adjustable large capacity height of bridge arm number boosts, the transformation Device includes a multiphase three-level inverter, and 1 direct-current input power supplying, 4 the input phases, 4 no-load voltage ratios are 1：The high frequency transformation of N Device, 2 gain units, an output diode D0, an output filter capacitor C0, load RL.Wherein：
The multiphase three-level inverter includes：Two capacitance C1、C2, 8 power switch S11、S12、S13、S14、 S21、 S22、S23、S24, 4 diode Db11、Db12、Db21、Db22.Capacitance C1The other end, C2One end and transformer T2、T4Primary side Connected node definition is node 0, switching tube S12Source electrode, S13Drain electrode and transformer T1The connected node definition of primary side For node 1, switching tube S22Source electrode, S23Drain electrode and transformer T3The connected node definition of primary side is node 2.Specific connection Mode is：Anode and the capacitance C of direct-current input power supplying1One end links together, at the same with switching tube S11、S21Drain electrode be connected to Together, the cathode of direct-current input power supplying and capacitance C2The other end link together, while with switching tube S14、S24Source electrode connection Together.Capacitance C1Another termination capacitor C2One end, switching tube S11Source electrode meet switching tube S12Drain electrode, while with two poles Pipe Db11Cathode be connected, switching tube S12Source electrode meet switching tube S13Drain electrode, switching tube S13Source electrode meet switching tube S14Leakage Pole, at the same with diode Db12Anode be connected, diode Db12Cathode and diode Db11Anode be connected, while with two poles Pipe Db21Anode and node 0 be connected.Switching tube S21Source electrode meet switching tube S22Drain electrode, while with diode Db21The moon Extremely it is connected, switching tube S22Source electrode meet switching tube S23Drain electrode, switching tube S23Source electrode meet switching tube S24Drain electrode, while with Diode Db22Anode be connected, diode Db22Cathode and diode Db21Anode be connected.
The specific connection type of the multiphase three-level inverter and transformer is：Transformer T1One terminated nodes of primary side 1, transformer T3One terminated nodes 2 of primary side, transformer T2、T4Primary side one end connects node 0.Each transformer primary side Another to terminate to together, the other end of secondary side is also connected together.
The gain unit 1 includes：Diode D21、D31、D41, capacitance C21、C31、C41.Its specific connection type is：Two poles Pipe D21Cathode meet capacitance C21One end, while with diode D31Anode be connected, diode D31Cathode meet capacitance C31's One end, at the same with diode D41Anode be connected, diode D41Cathode meet capacitance C41One end.
The gain unit 2 includes：Diode D12、D22、D32、D42, capacitance C12、C22、C32、C42.Its specific connection type For：Diode D12Cathode meet capacitance C12One end, while with diode D22Anode be connected, diode D22Cathode connect electricity Hold C22One end, while with diode D32Anode be connected, diode D42Cathode meet capacitance C42One end.
It is between the gain unit and with the specific connection type of transformer and other components：Transformer T1It is secondary Side one terminates diode D in gain unit 121Anode and output filter capacitor COWith load RLThe other end, while with increasing Capacitance C in beneficial unit 212The other end is connected, transformer T2Secondary side one terminates capacitance C in gain unit 121, electricity in gain unit 2 Hold C22The other end is connected, transformer T3Secondary side one terminates capacitance C in gain unit 131, capacitance C in gain unit 232, transformation Device T4Secondary side one terminates capacitance C in gain unit 141, capacitance C in gain unit 242, diode D in gain unit 242Cathode With capacitance C42Node between one end with diode DOAnode is connected.Load RLWith C0Parallel connection loads RLOne terminating diode D0 Cathode.Diode D in gain unit 141Cathode and capacitance C41Node between one end and diode D in gain unit 212's Anode is connected, diode D in gain unit 242Cathode and capacitance C42Node between one end and diode D in gain unit 313 Anode be connected.
A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number, control mode is at 0 ° Each switch of the bridge arm subscript tail marked as 1,2, i.e. S is connected in~90 ° of sections11、S12, S21、S22.It is connected in 90 °~180 ° sections Each switch of the bridge arm subscript tail marked as 2,3, i.e. S12、S13, S22、S23.Each bridge arm subscript is connected in 180 °~270 ° sections Switch of the tail marked as 3,4, i.e. S13、S14, S23、S24.Each bridge arm subscript tail is connected marked as 2,3 in 270 °~360 ° sections Switch, i.e. S12、S13, S22、S23.There are enough dead times for each group of switch conduction.
It is different according to AC power current direction, circuit can be divided into four 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 output at this time, capacitance C1Electric discharge, capacitance C2Charging.AC power, power switch S11、S12, Transformer T1, transformer T2And capacitance C2Constitute a side loop.Induced current passes through transformer T1Secondary side one end passes through Diode D21, capacitance C21Charging, passes through diode D22To capacitance C22Charging, capacitance C12Electric discharge；Meanwhile AC power, power Switch S21、S22, transformer T3, transformer T4And capacitance C2Constitute another side loop.Induced current passes through transformer T3 Secondary side one end passes through diode D41, give capacitance C41Charging, capacitance C31Electric discharge, passes through diode D42To capacitance C42Charging, capacitance C32Electric discharge；Diode D31、D12、 D32、D0It 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 output at this time.All diodes are turned off at this time, and all capacitances neither charge nor discharge.
(3), controller control switch S13, switch S14, switch S23, switch S24Conducting, switch S11, switch S12, switch S21、 Switch S22Shutdown, the negative level of inverter output at this time, capacitance C1Charging, capacitance C2Electric discharge.AC power, capacitance C1, transformer T2, transformer T3And switch S23, switch S24Constitute a side loop.Induced current passes through the second transformer T2Secondary side one End passes through diode D31Give capacitance C31Charging, capacitance C21Electric discharge, passes through diode D32To capacitance C32Charging, capacitance C22Electric discharge； AC power, capacitance C simultaneously1, transformer T4, transformer T1And switch S13, switch S14Another side loop is constituted, is felt Induced current passes through the 4th transformer T4Secondary side one end passes through diode D12Give capacitance C12Charging, capacitance C41Electric discharge, passes through diode D0To capacitance C0Charging, capacitance C42Electric discharge, at the same to load RLPower supply；Diode D21、D41、D12、D42It 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.
Pass through above-mentioned analysis, it can be seen that the converter realizes automatic current equalizing, and capacity is big, and output voltage gain is high.
Flow principle analysis：
With Fig. 2,4 the input phase examples.When stable state, bridge-type inverter output voltage Uin equivalent can become a square wave alternating-current electricity Source, when input AC electricity is in positive axis, capacitance C31、C12、C32Electric discharge, capacitance C21、C41、C22、C42Charge input voltage Uin It is begun to ramp up from 0, when Uin rises above capacitance C21Voltage UC21When diode D21Conducting, capacitance C21It starts to charge up, electricity Pressure rises；When Uin rises to (Uin+UC12) it is more than UC22When diode D22Conducting, capacitance C22It starts to charge up, on voltage It rises.At the same time, Uin rises to (Uin+UC31) it is more than UC41When diode D41Conducting, capacitance C41It starting to charge up, voltage rises, Uin rises to (Uin+UC32) it is more than UC42When diode D42Conducting, capacitance C42It starts to charge up, voltage rises.Capacitance C21、C41、 C22、C42Lasting charging, until Uin rises to maximum value Uinmax, subsequent time diode D21、D41、D22、D42Reversed cut-off, Capacitance C21、C41、C22、C42Charging finishes, capacitance C31、C12、C32Discharge off.When input AC electricity is in negative semiaxis in such Seemingly, it repeats no more.
According to capacitance CoAmpere-second equilibrium principle, output current IoEqual to diode D0The electric current I flowed throughD0, due to capacitance C42 Presence, flow through diode D42On electric current ID42Equal to ID0, and so on, in the first branch, flow through diode D21On electricity Flow ID21Equal to output current Io.Similarly, the electric current that other branches flow through also is equal to output current Io, the present invention realizes automatically Flow.It is similar in this to expand to n input analytic process.
Simulation parameter：To constant switching frequency f=50kHz, transformer voltage ratio 1:1, duty cycle of switching D=0.5, input electricity Press uinFor 30V when, output voltage u0Close to 120V.From Tu Nei it can be seen that 4 inductive currents are equal.Flow through 4 transformers Electric current is impartial, realizes automatic current equalizing.

Claims (3)

  1. The three level isolated form DC/DC converters 1. a kind of adjustable large capacity height of bridge arm number boosts, it is characterised in that：The converter Including a multiphase three-level inverter, 1 direct-current input power supplying, 2mA the input phase, 2mA no-load voltage ratio is 1：NHigh frequency transformation Device,nA gain unit, an output diode D0, an output filter capacitorC 0, loadR L ；Wherein：
    The multiphase three-level inverter includes：mA tri-level inversion bridge arm, two input side filter capacitorsC 1、C 2, 4mA work( Rate switch S1 1、S12、S13、S1 4、S2 1、S2 2、S23、S2 4...S m 1、S m 2、S m3、S m4, 2mA diode Db1 1、Db1 2、Db2 1、 Db2 2...Dbm 1、Dbm 2；CapacitanceC 1The other end,C 2The node definition that is connected with even number transformer primary side of one end be section Point 0, switching tube S1 2Source electrode, S1 3Drain electrode and transformer T1The connected node definition of primary side is node 1, switching tube S2 2 Source electrode, S2 3Drain electrode and transformer T3The connected node definition of primary side be node 2 ..., and so on, switching tube S m 2 Source electrode, S m 3Drain electrode and transformer T2m-1The connected node definition of primary side is nodem；Specifically connection type is：Direct current is defeated Enter the anode and capacitance of power supplyC 1One end links together, while the switching tube S for being 1 with subscript mantissa1 1、S2 1、S3 1...S m 1 Drain electrode link together, the cathode and capacitance of direct-current input power supplyingC 2The other end link together, while with subscript mantissa For 4 switching tube S1 4、S2 4...S m 4Source electrode link together；CapacitanceC 1Another termination capacitorC 2One end, switching tube S1 1Source electrode meet switching tube S1 2Drain electrode, while with diode Db1 1Cathode be connected, switching tube S1 2Source electrode connect switching tube S1 3Drain electrode, switching tube S1 3Source electrode meet switching tube S1 4Drain electrode, while with diode Db1 2Anode be connected, diode Db1 2Cathode and diode Db1 1Anode be connected, while with diode Db2 1Anode and node 0 be connected；Switching tube S2 1 Source electrode meet switching tube S2 2Drain electrode, while with diode Db2 1Cathode be connected, switching tube S2 2Source electrode meet switching tube S2 3 Drain electrode, switching tube S2 3Source electrode meet switching tube S2 4Drain electrode, while with diode Db2 2Anode be connected, diode Db2 2 Cathode and diode Db2 1Anode be connected, while with diode Db3 1Anode be connected ..., and so on, switching tube S m-1 1Source electrode meet switching tube S m-1 2Drain electrode, while with diode Dbm-1 1Cathode be connected, switching tube S m-1 2Source electrode connect Switching tube S m-1 3Drain electrode, switching tube S m-1 3Source electrode meet switching tube S m-1 4Drain electrode, while with diode Dbm-1 2Anode It is connected, diode Dbm-1 2Cathode and diode Dbm-1 1Anode be connected, while with diode Dbm 1Anode be connected；Switch Pipe S m 1Source electrode meet switching tube S m 2Drain electrode, while with diode Dbm 1Cathode be connected, switching tube S m 2Source electrode connect switch Pipe S m 3Drain electrode, switching tube S m 3Source electrode meet switching tube S m 4Drain electrode, while with diode Dbm 2Anode be connected, two poles Pipe Dbm 2Cathode and diode Dbm 1Anode be connected；
    The specific connection type of the multiphase three-level inverter and transformer is：Transformer T1One terminated nodes 1 of primary side become Depressor T3One terminated nodes 2 of primary side, and so on to the 2ndm- 1 phase, transformer T2m-1One terminated nodes of primary sidem, under be designated as The transformer T of even number2、T4、...、T2m Primary side one end connects node 0；The another of each transformer primary side terminates to together, and two The other end of secondary side is also connected together；
    The gain unit 1 includes：Diode D2 1、D3 1、D4 1...D2m 1, capacitanceC 2 1、C 3 1、C 4 1...C 2m 1；It specifically connects The mode of connecing is：Diode D2 1Cathode connect capacitanceC 2 1One end, while with diode D3 1Anode be connected, diode D3 1's Cathode connects capacitanceC 3 1One end, while with diode D4 1Anode be connected ..., and so on, diode D2m-1 1Cathode Connect capacitanceC 2m-1 1One end, while with diode D2m 1Anode be connected, diode D2m 1Cathode connect capacitanceC 2m 1One end；
    The gain unit 2 includes：Diode D1 2、D2 2、D3 2...D2m 2, capacitanceC 1 2、C 2 2、C 3 2...C 2m 2；It specifically connects The mode of connecing is：Diode D1 2Cathode connect capacitanceC 1 2One end, while with diode D2 2Anode be connected, diode D2 2's Cathode connects capacitanceC 2 2One end, while with diode D3 2Anode be connected ..., and so on diode D2m-1 2Cathode connect CapacitanceC 2m-1 2One end, while with diode D2m 2Anode be connected, diode D2m 2Cathode connect capacitanceC 2m 2One end；
    The gain unit 3 includes：Diode D1 3、D2 3、D3 3...D2m 3, capacitanceC 1 3、C 2 3、C 3 3...C 2m 3；It specifically connects The mode of connecing is：Diode D1 3Cathode connect capacitanceC 1 3One end, while with diode D2 3Anode be connected, diode D2 3's Cathode connects capacitanceC 2 3One end, while with diode D3 3Anode be connected ..., and so on diode D2m-1 3Cathode connect CapacitanceC 2m-1 3One end, while with diode D2m 3Anode be connected, diode D2m 3Cathode connect capacitanceC 2m 3One end；
    ...
    And so on, the gain unitnIncluding：Diode D1 n 、D2 n 、D3 n ...D2mn , capacitanceC 1 n 、 C 2 n 、C 3 n ...C 2mn ；Its specific connection type is：Diode D1 n Cathode connect capacitanceC 1 n One end, while with diode D2 n Anode It is connected, diode D2 n Cathode connect capacitanceC 2 n One end, while with diode D3 n Anode be connected ..., and so on two Pole pipe D2m-1 n Cathode connect capacitanceC 2m-1 n One end, while with diode D2mn Anode be connected, diode D2mn Cathode connect CapacitanceC 2mn One end；
    It is between the gain unit and with the specific connection type of transformer and other components：Transformer T1Secondary side one Terminate diode D in gain unit 12 1Anode and output filter capacitorC OAnd loadR L The other end, while with gain list Capacitance in member 2C 1 2, capacitance in gain unit 3C 1 3..., gain unitnMiddle capacitanceC 1 n The other end be connected, transformer T2Two Secondary side one terminates capacitance in gain unit 1C 2 1, capacitance in gain unit 2C 2 2..., gain unitnMiddle capacitanceC 2 n It is another End is connected, transformer T3Secondary side one terminates capacitance in gain unit 1C 3 1, capacitance in gain unit 2C 3 2..., gain list MembernMiddle capacitanceC 3 n The other end be connected ..., and so on, transformer T2m Secondary side one terminates capacitance in gain unit 1C 2m 1, capacitance in gain unit 2C 2m 2..., gain unitnMiddle capacitanceC 2mn The other end be connected；Diode in gain unit 1 D2m 1Cathode and capacitanceC 2m 1Node between one end and diode D in gain unit 21 2Anode be connected, two in gain unit 2 Pole pipe D2m 2Cathode and capacitanceC 2m 2Node between one end and diode D in gain unit 31 3Anode be connected ..., with this Analogize, gain unitnDiode D in -12mn-1Cathode and capacitanceC 2mn-1Node between one end and gain unitnMiddle diode D1 n Anode be connected, gain unitnMiddle diode D2mn Cathode and capacitanceC 2mn Node between one end and diode DOAnode phase Even；LoadR L WithC 0Parallel connection, loadR L One terminating diode D0Cathode.
  2. 2. according to a kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number described in claims 1, It is characterized in that its control mode is：Each switch of the bridge arm subscript tail marked as 1,2, i.e. S is connected in 0 ° ~ 90 ° sections1 1、 S1 2, S2 1、S2 2... S m 1、S m 2；Each switch of the bridge arm subscript tail marked as 2,3, i.e. S is connected in 90 ° ~ 180 ° sections1 2、 S1 3, S2 2、S2 3...S m 2、S m 3；Each switch of the bridge arm subscript tail marked as 3,4, i.e. S is connected in 180 ° ~ 270 ° sections1 3、 S1 4, S2 3、S2 4...S m 3、S m 4；Each switch of the bridge arm subscript tail marked as 2,3, i.e. S is connected in 270 ° ~ 360 ° sections1 2、 S1 3, S2 2、S2 3...S m 2、S m 3；There are enough dead times for each group of switch conduction.
  3. 3. according to a kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number described in claims 1, It is characterized in that：It is different according to AC power current direction, circuit is divided into four kinds of working conditions：
    Controller controls switch S1 1, switch S1 2, switch S2 1, switch S2 2Conducting, switch S1 3, switch S1 4, switch S2 3, open Close S2 4Shutdown, the positive level of inverter output at this time, capacitanceC 1Electric discharge, capacitanceC 2Charging；AC power, power switch S1 1、S1 2, Transformer T1, transformer T2And capacitanceC 2Constitute a side loop；Induced current passes through transformer T1Secondary side one end passes through Diode D2 1, capacitanceC 2 1Charging, passes through diode D2 2To capacitanceC 2 2Charging, capacitanceC 1 2Electric discharge；Meanwhile AC power, work( Rate switch S2 1、S2 2, transformer T3, transformer T4And capacitanceC 2Constitute another side loop；Induced current passes through transformation Device T3Secondary side one end passes through diode D4 1, give capacitanceC 4 1Charging, capacitanceC 3 1Electric discharge, passes through diode D4 2To capacitanceC 4 2It fills Electricity, capacitanceC 3 2Electric discharge；Diode D3 1、D1 2、D3 2、D0It is turned off；
    （2）, controller control switch S1 2, switch S1 3, switch S2 2, switch S2 3Conducting, switch S1 1, switch S1 4, switch S2 1, switch S2 4Shutdown, 0 level of inverter output at this time；All diodes are turned off at this time, all capacitances neither charge nor Electric discharge；
    （3）, controller control switch S1 3, switch S1 4, switch S2 3, switch S2 4Conducting, switch S1 1, switch S1 2, switch S2 1, switch S2 2Shutdown, the negative level of inverter output at this time, capacitanceC 1Charging, capacitanceC 2Electric discharge；AC power, capacitanceC 1, become Depressor T2, transformer T3And switch S2 3, switch S2 4Constitute a side loop；Induced current passes through the second transformer T2 Secondary side one end passes through diode D3 1To capacitanceC 3 1Charging, capacitanceC 2 1Electric discharge, passes through diode D3 2To capacitanceC 3 2Charging, electricity HoldC 2 2Electric discharge；AC power, capacitance simultaneouslyC 1, transformer T4, transformer T1And switch S1 3, switch S1 4Constitute another one Secondary side loop, induced current pass through the 4th transformer T4Secondary side one end passes through diode D1 2To capacitanceC 1 2Charging, capacitanceC 4 1It puts Electricity passes through diode D0To capacitanceC 0Charging, capacitanceC 4 2Electric discharge, while to loadR L Power supply；Diode D2 1、D4 1、D1 2、D4 2 It is turned off；
    （4）Controller controls switch S1 2, switch S1 3, switch S2 2, switch S2 3Conducting, switch S1 1, switch S1 4, switch S2 1、 Switch S2 4Shutdown, 0 level of inverter output at this time；All diodes are turned off at this time, and all capacitances neither charge nor put Electricity.
CN201810574377.6A 2018-08-03 2018-08-03 A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number Withdrawn CN108631605A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115528922A (en) * 2022-11-29 2022-12-27 深圳市恒运昌真空技术有限公司 Three-phase resonant converter
CN115528921A (en) * 2022-11-29 2022-12-27 深圳市恒运昌真空技术有限公司 Three-phase high-gain converter and control method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115528922A (en) * 2022-11-29 2022-12-27 深圳市恒运昌真空技术有限公司 Three-phase resonant converter
CN115528921A (en) * 2022-11-29 2022-12-27 深圳市恒运昌真空技术有限公司 Three-phase high-gain converter and control method thereof
CN115528921B (en) * 2022-11-29 2023-03-03 深圳市恒运昌真空技术有限公司 Three-phase high-gain converter and control method thereof
CN115528922B (en) * 2022-11-29 2023-03-03 深圳市恒运昌真空技术有限公司 Three-phase resonant converter

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Application publication date: 20181009