CN108448903A - A kind of double active-clamp quasi-resonance BOOST full-bridge topologies and control method - Google Patents

A kind of double active-clamp quasi-resonance BOOST full-bridge topologies and control method Download PDF

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CN108448903A
CN108448903A CN201810399807.5A CN201810399807A CN108448903A CN 108448903 A CN108448903 A CN 108448903A CN 201810399807 A CN201810399807 A CN 201810399807A CN 108448903 A CN108448903 A CN 108448903A
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clamp
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inductance
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CN108448903B (en
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郑泽东
刘基业
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Tsinghua University
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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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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

Abstract

The present invention relates to a kind of double active-clamp quasi-resonance BOOST full-bridge topologies and control methods, it includes the H bridges being made of four active switching tube S1 S4, the input terminal of the H bridges is arranged in parallel by the clamp branch clamp switch pipe Sax and clamping capacitance Ca in series, and by the resonant branch R-T tube Sr and resonant capacitance Cres in series；The one end the boost inductance L is connect with the clamp branch input, and the other end is connect with external power supply；The output end of the H bridges is connect through the resonant inductance Lr with the primary side side of the transformer, it is arranged in parallel the magnetizing inductance in the transformer primary avris, the secondary avris of the transformer is connect with the rectifier bridge input terminal, and the rectification bridge output end is in parallel with the output commutation capacitor Co.The present invention realizes Sofe Switch of the active power semiconductor device of entire circuit during turning on and off, and reduces the loss of converter, improves the efficiency of converter.

Description

A kind of double active-clamp quasi-resonance BOOST full-bridge topologies and control method
Technical field
The present invention relates to the power electronics and field of conversion of electrical energy in a kind of electrotechnics, especially with regard to a kind of double active Clamp quasi-resonance BOOST full-bridge topologies and control method.
Background technology
The novel renewable energies such as solar energy, fuel cell have the spies such as the unstable, output-power fluctuation of output voltage Point, current source type DC-DC converter is since input current ripple is small, the advantages that step-up ratio is high, and no-load voltage ratio is adjustable, in new energy It is widely used in power generation and field of conversion of electrical energy.
The principle that soft switch technique cannot be mutated using inductance or capacitance storage energy in moment so that full-control type electric power half Conductor device, such as insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) or metal Oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), voltage or electric current are zero in opening either turn off process, to reduce the loss of converter, improve converter Efficiency.
Conventional current source type active-clamp BOOST full-bridge topologies are by four active H bridges power semiconductor devices, a masters Ejector half clamps power semiconductor device, a boost inductance, a clamping capacitance, a transformer, a diode rectifier bridge With an output commutation capacitor composition, which is merely capable of realizing four active H bridges power semiconductor devices, an actives Type clamps Sofe Switch of the power semiconductor device in opening process, reduces turn-on consumption, but cannot achieve turn off process In Sofe Switch.Therefore a big chunk for accounting for total losses is lost in power semiconductor device turn off process, seriously affects transformation The efficiency of device.
Invention content
To overcome conventional current source type active-clamp BOOST full-bridge topologies that can not realize Sofe Switch in turn off process Disadvantage, the present invention propose a kind of double active-clamp quasi-resonance BOOST full-bridge topologies and control method, entire electricity may be implemented Sofe Switch of the active power semiconductor device on road during turning on and off, and then reduce the loss of converter, it improves The efficiency of converter.
To achieve the above object, the present invention takes following technical scheme：A kind of double active-clamp quasi-resonance BOOST full-bridges are opened up It flutters, it is characterised in that：H bridges, the active resonance that it includes boost inductance L, is made of four active switching tube S1-S4 Switching tube Sr, active clamp switch pipe Sax, clamping capacitance Ca, resonant capacitance Cres, transformer and its magnetizing inductance Lm, Resonant inductance Lr, by four diode D1-D4 rectifier bridges constituted and output commutation capacitor Co；The input terminal of the H bridges is in parallel It is provided with by the clamp branch clamp switch pipe Sax and clamping capacitance Ca in series, and by the R-T tube Resonant branch in series Sr and resonant capacitance Cres；The one end the boost inductance L is connect with the clamp branch input, The other end is connect with external power supply；The output end of the H bridges is connect through the resonant inductance Lr with the primary side side of the transformer, It is arranged in parallel the magnetizing inductance, the secondary avris of the transformer and the rectifier bridge input terminal in the transformer primary avris Connection, the rectification bridge output end are in parallel with the output commutation capacitor Co.
A kind of double active-clamp quasi-resonance BOOST full-bridge topology control methods based on above topology, it is characterised in that：Institute The preceding half period for stating topological circuit is identical as the second half of the cycle course of work, and the control process of preceding half period is as follows：In t0- T1 stages, four switching tube S1-S4 control signals V in H bridgesGSIt for high level, simultaneously turns on, is boost inductance L chargings； In the t1-t2 stages, diagonal switching tube S2 and S3 control signals in H bridges are low level, and switching tube S2 and S3 shutdown is flowed through resonance and opened Close the electric current i of pipe SrCrEqual to input current；Boost inductance L is resonance electricity by the anti-paralleled diode in R-T tube Sr Hold Cres chargings, until resonant capacitance Cres voltages vCresThe voltage Vca equal to clamping capacitance Ca is charged to from 0V；Transformer primary side Alternating voltage VABClamping capacitor voltage Vca is risen to from 0V, the voltage v on resonant inductanceLrEqual to Vca-Vo`, wherein Vo` etc. In the quotient of output voltage Vo and transformer voltage ratio n, Vo`=Vo/n；In the t2-t3 stages, diode rectifier bridge is begun to turn on, power Secondary side is flowed to from transformer T primary sides.The electric current for flowing to clamping capacitance Ca at this time passes through two pole of inverse parallel of clamp switch pipe Sax Pipe, flows through the electric current i of clamp switch pipe SaxCaIt is quickly risen to from 0 close to input current；In the t3-t4 stages, diode rectification Bridge continues to be connected, and power continues to flow to secondary side from transformer T primary sides, and the electric current for clamping branch passes through the master of clamp switch pipe Sax Body；In the t4-t5 stages, clamp switch pipe Sax becomes an OFF state from conducting state, and resonant capacitance Cres starts to discharge, until Voltage is discharged to 0V from Vca；After the t5-t6 stages, pincers resonant capacitance Cres tension discharges to 0V, then due to resonant inductance Lr Electric current cannot be mutated, the anti-paralleled diode of the diagonal switching tube S2 and S3 in H bridges is begun to turn on, by resonant capacitance Cres electricity Pressure clamp cannot continue to reduce in 0V；Meanwhile the diagonal switching tube S2 and S3 in this stage H bridges becomes leading from off state Logical state；It is gradually reduced in the electric current in t6-t7 stages, resonant inductance Lr, until being reduced to the exciting current of transformer T, two poles Pipe rectifier bridge becomes an OFF state from conducting state, and hereafter four switching tube S1-S4 in H bridges are simultaneously turned on again, for boosting Inductance L chargings.
Further, in the t0-t1 stages, the electric current i of switching tube S1 is flowed throughS1For input current IinWith maximum excitation electricity Flow Im_maxDifference half；Flow through the electric current i of switching tube S2S2For input current IinWith maximum exciting current Im_maxThe sum of one Half；Flow through the electric current i of magnetizing inductance LmLmWith flow through resonant inductance LrElectric current iLrIt is negative exciting current maximum value；Clamp Voltage v on capacitance CaCaFor stationary value Vca, capacitance Cres voltages vCresFor 0V.
Further, in the t1-t2 stages, resonant capacitance Cres voltages cannot be mutated, the diagonal switching tube S2 in H bridges and It is 0V that moment, which bears voltage, after S3 shutdowns, realizes the Sofe Switch in turn off process.
Further, become being connected from off state in the t2-t3 stages, clamp switch pipe Sax and R-T tube Sr State realizes clamp switch pipe Sax in opening process under the clamping action of the anti-paralleled diode of clamp switch pipe Sax Sofe Switch.
Further, it is realized in the t2-t3 stages since the voltage of resonant capacitance Cr is equal to the voltage of clamping capacitance Ca R-T tube Sr's is soft open-minded.
Further, in the t4-t5 stages, resonant capacitance Cres voltages cannot be mutated, and clamp switch pipe Sax is after shut-off It is 0V that moment, which bears voltage, realizes the soft switching of clamp switch pipe Sax.
Further, in the t5-t6 stages, R-T tube Sr becomes an OFF state from conducting state, and entire mistake It is 0V that voltage is born in journey, realizes the soft switching of R-T tube Sr；Simultaneously as the diagonal switching tube S2 and S3 in H bridges The clamping action of itself anti-paralleled diode, it is 0V that voltage is born before opening, and realizes the soft open-minded of diagonal switching tube S2 and S3.
Further, in the t5-t6 stages, voltage v that resonant inductance is bornCaBecome for negative output voltage Vo and transformer Quotient-Vo` than n.
The invention adopts the above technical scheme, which has the following advantages：The present invention may be implemented whole active half The Sofe Switch of conductor device (S1-S4, Sax, Sr) opening process and turn off process, to reduce the switching loss of switching tube, The cooling requirements for alleviating switching tube improve the efficiency of converter.
Description of the drawings
Fig. 1 is the topological structure schematic diagram of the present invention；
Fig. 2 is the control method schematic diagram of the present invention.
Specific implementation mode
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention provides a kind of double active-clamp quasi-resonance BOOST full-bridge topologies comprising boost inductance L, H bridges, active R-T tube Sr, the active clamp switch pipe being made of four active switching tube S1-S4 Sax, clamping capacitance Ca, resonant capacitance Cres, transformer T and its magnetizing inductance Lm, resonant inductance Lr, by four diode D1- The rectifier bridge and output commutation capacitor Co that D4 is constituted.
Switching tube S1 and switching tube S3 the first bridge arm in series in H bridges, switching tube S2 and switching tube S3 are in series Second bridge arm, the first bridge arm composition H bridge in parallel with the second bridge arm.The input terminal of H bridges be arranged in parallel by clamp switch pipe Sax and Clamp branch in series clamping capacitance Ca, and by resonance branch R-T tube Sr and resonant capacitance Cres in series Road.The one end boost inductance L is connect with clamp branch input, and the boost inductance L other ends are connect with external power supply.The output of H bridges End AB is connect through resonant inductance Lr with the primary side side of transformer T, and magnetizing inductance Lm has been arranged in parallel in transformer T primary sides side；Become The secondary avris of depressor T is connect with rectifier bridge input terminal, and rectification bridge output end is in parallel with output commutation capacitor Co.
As shown in Fig. 2, being based on above topology, the present invention also provides a kind of double active-clamp quasi-resonance BOOST full-bridge topologies Control method, since the preceding half period of topological circuit is identical as the second half of the cycle course of work, for former half period into Row is discussed in detail；It includes following procedure：
Four switching tube S1-S4 control signals V in the t0-t1 stages, H bridgesGSIt for high level, simultaneously turns on, for boosting Inductance L chargings.Flow through the electric current i of switching tube S1S1For input current IinWith maximum exciting current Im_maxDifference half, i.e., (Iin/2-Im_max/2)；Flow through the electric current i of switching tube S2S2For input current IinWith maximum exciting current Im_maxThe sum of half, That is (Iin/2+Im_max/2)；Flow through the electric current i of magnetizing inductance LmLmWith flow through resonant inductance LrElectric current iLrIt is that negative excitation is electric Flow maximum value, i.e.-Im_max.Voltage v on clamping capacitance CaCaFor stationary value Vca, capacitance Cres voltages vCresFor 0V.
Diagonal switching tube S2 and S3 control signals in the t1-t2 stages, H bridges are low level, and switching tube S2 and S3 are turned off, Flow through the electric current i of R-T tube SrCrEqual to input current.Boost inductance L passes through two pole of inverse parallel in R-T tube Sr Pipe is resonant capacitance Cres chargings, until resonant capacitance Cres voltages vCresThe voltage Vca equal to clamping capacitance Ca is charged to from 0V. Transformer primary side alternating voltage VABClamping capacitor voltage Vca is risen to from 0V, the voltage v on resonant inductanceLrEqual to Vca-Vo`, Wherein Vo` is equal to the quotient of output voltage Vo and transformer voltage ratio n, i.e. this stage of Vo`=Vo/n. is due to resonant capacitance Cres voltages It cannot be mutated, it is 0V that moment, which bears voltage, after the diagonal switching tube S2 and S3 shutdowns in H bridges, realizes soft switching, i.e. turn off process In Sofe Switch.
In the t2-t3 stages, diode rectifier bridge is begun to turn on, and power flows to secondary side from transformer T primary sides.Pincers is flowed at this time The electric current of position capacitance Ca passes through the anti-paralleled diode of clamp switch pipe Sax, flows through the electric current i of clamp switch pipe SaxCaVery from 0 Input current is risen towards soon.Become conducting shape from off state in this stage clamp switch pipe Sax and R-T tube Sr State realizes that clamp switch pipe Sax's is soft open-minded due to the clamping action of the anti-paralleled diode of clamp switch pipe Sax, i.e., open-minded Sofe Switch in the process.Since the voltage of resonant capacitance Cr is equal to the voltage of clamping capacitance Ca, realize that R-T tube Sr's is soft It is open-minded.
In the t3-t4 stages, diode rectifier bridge continues to be connected, and power continues to flow to secondary side from transformer T primary sides, at this time pincers The electric current of position branch passes through the main body of clamp switch pipe Sax.
In the t4-t5 stages, clamp switch pipe Sax becomes an OFF state from conducting state, and resonant capacitance Cres starts to discharge, Until voltage is discharged to 0V from Vca.Since resonant capacitance Cres voltages cannot be mutated, clamp switch pipe Sax moments after shut-off It is 0V to bear voltage, realizes the soft switching of clamp switch pipe Sax.
After the t5-t6 stages, pincers resonant capacitance Cres tension discharges to 0V, then since the electric current of resonant inductance Lr cannot It is mutated, the anti-paralleled diode of the diagonal switching tube S2 and S3 in H bridges is begun to turn on, by resonant capacitance Cres voltage clamps in 0V And it cannot continue to reduce.R-T tube Sr becomes an OFF state from conducting state at this time, and voltage is born in whole process For 0V, it is achieved that the soft switching of R-T tube Sr.Meanwhile the diagonal switching tube S2 and S3 in this stage H bridges is from pass Disconnected state becomes conducting state, and due to the clamping action of its own anti-paralleled diode, it is 0V that voltage is born before opening, and is realized Diagonal switching tube S2's and S3 is soft open-minded.At this point, the voltage v that resonant inductance is bornCaBecome for negative output voltage Vo and transformer Quotient-Vo` than n, i.e.-Vo/n.
It is gradually reduced in the electric current in t6-t7 stages, resonant inductance Lr, until being reduced to the exciting current of transformer T, two poles Pipe rectifier bridge becomes an OFF state from conducting state, and hereafter four switching tube S1-S4 in H bridges are simultaneously turned on again, for boosting Inductance L chargings.
T0-t7 is preceding half of cycling process of topological circuit, second half of the cycle t7-t14 and preceding half period t0-t7 It works similar, details are not described herein.
The various embodiments described above are merely to illustrate the present invention, and the setting of each element and type may be changed, Based on the technical solution of the present invention, all improvement that individual component is carried out according to the principle of the invention and equivalents, not It should exclude except protection scope of the present invention.

Claims (9)

1. a kind of double active-clamp quasi-resonance BOOST full-bridge topologies, it is characterised in that：It includes boost inductance L, by four actives H bridges, active R-T tube Sr, active clamp switch pipe Sax, the clamping capacitance that the switching tube S1-S4 of type is constituted Ca, resonant capacitance Cres, transformer and its magnetizing inductance Lm, resonant inductance Lr, the rectifier bridge being made of four diode D1-D4 With output commutation capacitor Co；
The input terminal of the H bridges is arranged in parallel by the clamp branch clamp switch pipe Sax and clamping capacitance Ca in series Road, and by the resonant branch R-T tube Sr and resonant capacitance Cres in series；The one end the boost inductance L with The clamp branch input connection, the other end are connect with external power supply；The output end of the H bridges through the resonant inductance Lr with The primary side side of the transformer connects, and the magnetizing inductance has been arranged in parallel in the transformer primary avris, the transformer Secondary avris is connect with the rectifier bridge input terminal, and the rectification bridge output end is in parallel with the output commutation capacitor Co.
2. a kind of double active-clamp quasi-resonance BOOST full-bridge topology control methods based on topology as described in claim 1, special Sign is：The preceding half period of the topological circuit is identical as the second half of the cycle course of work, the control process of preceding half period It is as follows：
Four switching tube S1-S4 control signals V in the t0-t1 stages, H bridgesGSIt for high level, simultaneously turns on, is boost inductance L Charging；
Diagonal switching tube S2 and S3 control signals in the t1-t2 stages, H bridges are low level, and switching tube S2 and S3 shutdown is flowed through The electric current i of R-T tube SrCrEqual to input current；Boost inductance L is by the anti-paralleled diode in R-T tube Sr Resonant capacitance Cres chargings, until resonant capacitance Cres voltages vCresThe voltage Vca equal to clamping capacitance Ca is charged to from 0V；Transformation Device primary side alternating voltage VABClamping capacitor voltage Vca is risen to from 0V, the voltage v on resonant inductanceLrEqual to Vca-Vo`, wherein Vo` is equal to the quotient of output voltage Vo and transformer voltage ratio n, Vo`=Vo/n；
In the t2-t3 stages, diode rectifier bridge is begun to turn on, and power flows to secondary side from transformer T primary sides.Flow direction clamp electricity at this time The electric current for holding Ca passes through the anti-paralleled diode of clamp switch pipe Sax, flows through the electric current i of clamp switch pipe SaxCaFrom 0 quickly on It is raised to close to input current；
In the t3-t4 stages, diode rectifier bridge continues to be connected, and power continues to flow to secondary side from transformer T primary sides, clamps branch Electric current passes through the main body of clamp switch pipe Sax；
In the t4-t5 stages, clamp switch pipe Sax becomes an OFF state from conducting state, and resonant capacitance Cres starts to discharge, until Voltage is discharged to 0V from Vca；
After the t5-t6 stages, pincers resonant capacitance Cres tension discharges to 0V, then since the electric current of resonant inductance Lr cannot dash forward Become, the anti-paralleled diode of the diagonal switching tube S2 and S3 in H bridges is begun to turn on, by resonant capacitance Cres voltage clamps in 0V and It cannot continue to reduce；Meanwhile the diagonal switching tube S2 and S3 in this stage H bridges becomes conducting state from off state；
It is gradually reduced in the electric current in t6-t7 stages, resonant inductance Lr, until being reduced to the exciting current of transformer T, diode is whole Stream bridge becomes an OFF state from conducting state, and hereafter four switching tube S1-S4 in H bridges are simultaneously turned on again, is boost inductance L Charging.
3. method as claimed in claim 2, it is characterised in that：In the t0-t1 stages, the electric current i of switching tube S1 is flowed throughS1It is defeated Enter electric current IinWith maximum exciting current Im_maxDifference half；Flow through the electric current i of switching tube S2S2For input current IinAnd maximum Exciting current Im_maxThe sum of half；Flow through the electric current i of magnetizing inductance LmLmWith flow through resonant inductance LrElectric current iLrIt is negative Exciting current maximum value；Voltage v on clamping capacitance CaCaFor stationary value Vca, capacitance Cres voltages vCresFor 0V.
4. method as claimed in claim 2, it is characterised in that：In the t1-t2 stages, resonant capacitance Cres voltages cannot dash forward Become, it is 0V that moment, which bears voltage, after the diagonal switching tube S2 and S3 shutdowns in H bridges, realizes the Sofe Switch in turn off process.
5. method as claimed in claim 2, it is characterised in that：In the t2-t3 stages, clamp switch pipe Sax and resonant switch Pipe Sr becomes conducting state from off state, under the clamping action of the anti-paralleled diode of clamp switch pipe Sax, realizes clamp Sofe Switch of the switching tube Sax in opening process.
6. such as claim 2 or 5 the methods, it is characterised in that：In the t2-t3 stages, due to the voltage of resonant capacitance Cr Equal to the voltage of clamping capacitance Ca, realize that R-T tube Sr's is soft open-minded.
7. method as claimed in claim 2, it is characterised in that：In the t4-t5 stages, resonant capacitance Cres voltages cannot dash forward Become, moment bears voltage as 0V to clamp switch pipe Sax after shut-off, realizes the soft switching of clamp switch pipe Sax.
8. method as claimed in claim 2, it is characterised in that：In the t5-t6 stages, R-T tube Sr becomes from conducting state For off state, and it is 0V that voltage is born in whole process, realizes the soft switching of R-T tube Sr；Simultaneously as H bridges In diagonal itself anti-paralleled diode of switching tube S2 and S3 clamping action, it is 0V that voltage is born before opening, and is realized diagonal Switching tube S2's and S3 is soft open-minded.
9. such as claim 2 or 8 the methods, it is characterised in that：In the t5-t6 stages, voltage v that resonant inductance is bornCa For the quotient-Vo` of negative output voltage Vo and transformer voltage ratio n.
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CN110011538A (en) * 2019-01-30 2019-07-12 深圳供电局有限公司 Modularized dc transformer and its modulator approach based on discretization switching capacity
CN114285291A (en) * 2021-12-30 2022-04-05 中国科学院电工研究所 Topology improvement structure and method of high-frequency high-power photovoltaic medium-voltage direct-current converter

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CN110011538B (en) * 2019-01-30 2020-09-08 深圳供电局有限公司 Modularized direct-current transformer based on discretization switch capacitor and modulation method thereof
CN114285291A (en) * 2021-12-30 2022-04-05 中国科学院电工研究所 Topology improvement structure and method of high-frequency high-power photovoltaic medium-voltage direct-current converter

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