CN109980976A - A kind of multi input two-stage type three phase soft switch current transformer - Google Patents

A kind of multi input two-stage type three phase soft switch current transformer Download PDF

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Publication number
CN109980976A
CN109980976A CN201910214716.4A CN201910214716A CN109980976A CN 109980976 A CN109980976 A CN 109980976A CN 201910214716 A CN201910214716 A CN 201910214716A CN 109980976 A CN109980976 A CN 109980976A
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Prior art keywords
bridge
switch
bridge arm
current transformer
diode
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Pending
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CN201910214716.4A
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Chinese (zh)
Inventor
徐德鸿
施科研
赵安
邓金溢
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN201910214716.4A priority Critical patent/CN109980976A/en
Publication of CN109980976A publication Critical patent/CN109980976A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02M1/0048—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

Abstract

The present invention discloses a kind of multi input two-stage type three phase soft switch current transformer, including n prime DC-DC converter, one rear class 3-phase power converter, access includes the auxiliary switch of anti-paralleled diode between the positive common bus and intermediate dc lateral capacitance of forward and backward grade, the resonant branch of clamping capacitance and resonant inductance composition, all main switches and auxiliary switch both ends parallel resonance capacitor.The present invention synchronizes the drive pulse signal of auxiliary switch and the main switch in front and back stages current transformer, it can realize that the no-voltage of all switching tubes is open-minded in each switch periods, effectively inhibit the reverse recovery current of main switch anti-paralleled diode, switching loss is small, circuit efficiency is high, be conducive to improve switching frequency, lifting system power density.

Description

A kind of multi input two-stage type three phase soft switch current transformer
Technical field
The present invention relates to multi input two-stage type converter topology field more particularly to a kind of multi input two-stage type three-phase is soft opens Close current transformer.
Background technique
Traditional multi input two-stage type converter circuit, including n group prime DC/DC current transformer, a rear class three-phase unsteady flow Device and dc-link capacitance Cdc；Every group of prime DC/DC current transformer includes one group of half-bridge bridge arm, an input inductance and one DC source；Every group of half-bridge bridge arm is made of two concatenated full-control type main switches comprising anti-simultaneously diode；Half-bridge bridge arm Midpoint connects one end of inductance, and the other end of inductance is connected with the anode of DC source, the lower end phase of the negative terminal and bridge arm of DC source Even；Above-mentioned output 3-phase power converter is made of three half-bridge bridge arms and three output inductors, one end of three output filtering It is connect respectively with three phase network；N half-bridge bridge arm of n group prime DC/DC current transformer and three half-bridges of rear class 3-phase power converter Bridge arm forms positive and negative common bus；Dc-link capacitance C is connected between positive and negative common busdc；Traditional multi input two-stage type becomes The work of device circuit is flowed in hard switching state, and there are diode reverse recovery phenomenon, change of current device switching loss is big, limits work The raising of frequency leads to that circuit efficiency need to be reduced using biggish filter.
Summary of the invention
The object of the present invention is to provide a kind of reduction switching loss, the multi input two-stage type three-phase for improving circuit efficiency soft is opened Close converter circuit topology and its modulator approach.
The one aspect of the content of present invention provides a multi input two-stage type three phase soft switch converter circuit, referring to Fig.1； The multi input two-stage type three phase soft switch converter circuit includes n group prime DC/DC current transformer, a rear class three-phase unsteady flow Device, one group of auxiliary resonance branch and dc-link capacitance Cdc；The circuit form of above-mentioned n group prime DC/DC current transformer is consistent, often Group DC/DC current transformer includes one group of half-bridge bridge arm, an input inductance and a DC source；Every group of half-bridge bridge arm is gone here and there by two Connection is constituted comprising anti-and diode full-control type main switch；For the upper and lower master of the half-bridge bridge arm of kth group input current transformer Switching tube and its anti-and diode are respectively Suk、SdkAnd Duk、Ddk, the midpoint of bridge arm connects inductance LkOne end, LkThe other end It is connected with the anode of DC source k, the negative terminal of DC source k is connected with the lower end of bridge arm, and k is 1~n；Above-mentioned auxiliary resonance branch packet Containing a parallel diode D7Auxiliary switch S7, resonant inductance LrWith clamping capacitance Cc, wherein auxiliary switch S7With clamp Capacitor CcAfter series connection again with resonant inductance LrIt is in parallel；Above-mentioned rear class 3-phase power converter is by three half-bridge bridge arms and three output filtering Inductance composition, the upper and lower main switch of the first bridge arm and its anti-and diode are respectively S1、S4And D1、D4, the second bridge arm it is upper, Lower main switch and its anti-and diode are respectively S3、S6And D3、D6, the upper and lower main switch of third bridge arm and its anti-and two poles Pipe is respectively S5、S2And D5、D2, the midpoint of three bridge arms respectively with three output inductor La、Lb、LcOne end be connected；La、 Lb、LcThe other end difference three phase network connection；The n half-bridge bridge arm and rear class 3-phase power converter of n group prime DC/DC current transformer The upper/lower terminals of three half-bridge bridge arms compose in parallel positive and negative common bus；Above-mentioned positive common DC bus and DC bus electricity Hold CdcAnode between access above-mentioned auxiliary resonance branch, negative common DC bus and dc-link capacitance CdcNegative terminal be connected； Each switching tube Su1~Sun、Sd1~Sdn、S1~S6And S7Collector and emitter both ends a resonant capacitance C in parallel respectivelyu1~ Cun、Cd1~Cdn、C1~C6And C7。
The other side of the content of present invention provides a kind of modulation methods of multi input two-stage type three phase soft switch current transformer Method, the upper and lower main switch S of n half-bridge bridge arm of the n group prime DC/DC current transformeru1~Sun、Sd1~SdnUsing pulsewidth modulation Method is controlled, the first bridge arm of the rear class 3-phase power converter, the second bridge arm, third bridge arm main switch S1~S6It adopts It is controlled with no-voltage Sine Wave Pulse Width Modulation or the sine wave pulse width modulation method for being filled with triple-frequency harmonics, all masters open Close pipe and auxiliary switch S7Manage switching frequency having the same；In each switch periods, to above-mentioned n group prime DC/DC unsteady flow From diode to the main switch change of current present in n half-bridge bridge arm of device and three half-bridge bridge arms of rear class 3-phase power converter The switch motion moment synchronizes, and auxiliary is turned off before the above-mentioned switch motion moment from diode to the main switch change of current Switching tube S7, positive and negative common bus voltage resonance is zero, creates the condition that no-voltage is opened for main switch；In all two poles After pipe terminates to supervisor's commutation course, resonant capacitance C7On voltage by resonance be zero, auxiliary switch S7No-voltage is carried out to open It is logical.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Using multi input two-stage type three phase soft switch converter circuit of the invention, it is able to achieve n group prime DC/DC current transformer The gamut zero voltage switch in power frequency period with all main switches of rear class 3-phase power converter and auxiliary switch, the transformation The Reverse recovery of clamp diode is inhibited in device, reduces electromagnetic interference.All device for power switching are realized soft in circuit Switch, switching loss is small, and circuit efficiency is high, is conducive to improve working frequency, and then improve power density.
Detailed description of the invention
Fig. 1 is multi input two-stage type three phase soft switch converter circuit topological diagram.
Fig. 2 is two input two-stage type three phase soft switch converter circuit topological diagrams.
Fig. 3 is six works divided in a power frequency period according to n group prime DC/DC electric current, three groups of rear class current waveforms Make interval diagram.
Fig. 4 is pulse control timing diagram of the present invention in section 1.
Fig. 5~19 are respectively the work equivalent circuit in each stage of a switch periods of the invention in section 1.
Figure 20 is the groundwork voltage and current waveform of present invention switch periods in section 1.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention Protection scope.The present invention is described in detail with reference to the accompanying drawing.
By taking prime DC/DC current transformer group number n=2 as an example, multi input two-stage type three phase soft switch converter circuit is opened up It flutters structure and modulation system is introduced, when group number n is other values, circuit topological structure and modulation system can be carried out Similar derivation and analysis.
Referring to Fig. 2, the multi input two-stage type three phase soft switch converter circuit includes n group prime DC/DC current transformer, and one A rear class 3-phase power converter, one group of auxiliary resonance branch and dc-link capacitance Cdc；Above-mentioned n group prime DC/DC current transformer Circuit form is consistent, and every group of DC/DC current transformer includes one group of half-bridge bridge arm, an input inductance and a DC source；Every group Half-bridge bridge arm is made of two concatenated full-control type main switches comprising anti-simultaneously diode；For kth group prime DC/DC unsteady flow The upper and lower main switch of the half-bridge bridge arm of device and its anti-and diode are respectively Suk、SdkAnd Duk、Ddk, the midpoint of bridge arm connects electricity Feel LkOne end, LkThe other end be connected with the anode of DC source k, the negative terminal of DC source k is connected with the lower end of bridge arm, k be 1~ n；Above-mentioned auxiliary resonance branch includes a parallel diode D7Auxiliary switch S7, resonant inductance LrWith clamping capacitance Cc, Middle auxiliary switch S7With clamping capacitance CcAfter series connection again with resonant inductance LrIt is in parallel；Above-mentioned rear class 3-phase power converter is by three and half Bridge bridge arm and three output inductor compositions, the upper and lower main switch of the first bridge arm and its anti-and diode are respectively S1、S4 And D1、D4, the upper and lower main switch of the second bridge arm and its anti-and diode are respectively S3、S6And D3、D6, third bridge arm it is upper and lower Main switch and its anti-and diode are respectively S5、S2And D5、D2, the midpoint of three bridge arms respectively with three output inductors La、Lb、LcOne end be connected；La、Lb、LcThe other end difference three phase network connection；N half-bridge of n group prime DC/DC current transformer The upper/lower terminal of three half-bridge bridge arms of bridge arm and rear class 3-phase power converter composes in parallel positive and negative common bus；It is above-mentioned just public DC bus and dc-link capacitance CdcAnode between access above-mentioned auxiliary resonance branch, negative common DC bus and direct current are female Line capacitance CdcNegative terminal be connected；Each switching tube Su1~Sun、Sd1~Sdn、S1~S6And S7Collector and emitter both ends distinguish One resonant capacitance C of parallel connectionu1~Cun、Cd1~Cdn、C1~C6And C7。
For two-stage type three phase soft switch converter circuit, electric current i can be exported according to three-phasea、ib、icPhase condition, Working region is divided into six regions, as shown in figure 3, the inductive current i of 2 groups of prime DC/DC current transformers simultaneously1、i2Pole Property, there is also be greater than zero and less than 0 two kinds situations.Below with three-phase current ia、ib、icIt is in region 1, and input current i1、i2It is all larger than for zero, the course of work of the circuit work in a switch periods is analyzed.
Due in region 1, i1、i2、iaGreater than zero, ib、icLess than zero, in a switch periods, there are five two poles Pipe is to the process of the main switch change of current, respectively Du1To Sd1The change of current, Du2To Sd2The change of current, D4To S1The change of current, D3To S6The change of current, D5To S2The change of current, in the switch periods, the pulse control timing of switching tube is as shown in figure 4, current transformer shares 16 working conditions.Figure 4~19 be the work equivalent circuit of a switch periods in the region, mains voltage and current waveform such as Figure 20 institute when work Show, the voltage and current reference direction of circuit is as shown in Figure 2.The course of work of the circuit work in other sections is similar.
Specific phase analysis is as follows:
One (t of stage0~t1):
As shown in figure 4, the half-bridge bridge arm upper tube diode D of the 1st group of prime DC/DC current transformeru1, the 2nd group of prime DC/DC change Flow the half-bridge bridge arm upper tube diode D of deviceu2, the first bridge arm down tube diode D of rear class 3-phase power converter4, the second bridge arm upper tube Diode D3, third bridge arm upper tube diode D5It is both turned on, by resonant inductance Lr, clamping capacitance Cc, auxiliary switch S7What is formed is auxiliary It helps in circuit, clamping capacitance CcBoth end voltage is UCc, resonant inductance electric current linear rise；
Two (t of stage1~t2):
As shown in figure 5, in t1Moment auxiliary switch S7Shutdown, resonant inductance LrMake main switch Sd1、Sd2、S1、S6、S2's Shunt capacitance Cd1、Cd2、C1、C6、C2Electric discharge, while making auxiliary switch S7Shunt capacitance C7Charging, resonant inductance LrElectric current iLr Resonance decline, in t2Moment, main switch Sd1、Sd2、S1、S6、S2Shunt capacitance Cd1、Cd2、C1、C6、C2Voltage resonance, should to zero Stage terminates；
Three (t of stage2~t3):
As shown in fig. 6, in t2D after momentd1、Dd2、D1、D6、D2It can be connected, by Cd1、Cd2、C1、C6、C2On voltage clamp Position is zero, can be in t2Moment opens Sd1、Sd2、S1、S6、S2, it can be achieved that Sd1、Sd2、S1、S6、S2No-voltage it is open-minded, in t3Moment, Dd1、Dd2、D1、D6、D2Electric current drops to zero, which terminates.
Four (t of stage3~t4):
As shown in fig. 7, in Dd1、Dd2、D1、D6、D2After shutdown, circuit enters change of current stage, electric current i1By diode Du1It opens Close pipe Sd1The change of current, electric current i2By diode Du2Switching tube Sd2The change of current, electric current iaBy diode D4To switching tube S1The change of current, electric current ib By diode D3To switching tube S6The change of current, electric current icBy diode D5To switching tube S2The change of current.The both ends resonant inductance Lr at this stage Voltage be clamped at Vdc, resonant inductance electric current iLrLinear decline, in t4Moment, above five bridge arm changes of current terminate, the rank Section terminates.Wherein VdcFor the voltage on dc-link capacitance.
Five (t of stage4~t5):
As shown in figure 8, in t4I after momentLrContinue to decline, C7Start to discharge, Cu1、Cu2、C4、C3、C5It starts to charge, electricity Road enters second of resonance, in t5Moment C7On voltage resonance to zero, which terminates.
Six (t of stage5~t6):
As shown in figure 9, t5After moment, D7It can be connected, by C7On voltage clamp be zero, be auxiliary tube S7No-voltage Offer condition is provided, it can be in t5Moment is to S7Open signal is sent, it is open-minded to achieve no-voltage, works as Sd2In t6When moment turns off, The stage terminates.
Seven (t of stage6~t7):
As shown in Figure 10, Sd2In t6After moment shutdown, the master up and down of the half-bridge bridge arm of the 2nd group of prime DC/DC current transformer is opened It closes pipe and starts the change of current, Cd2It starts to charge, Cu2Start to discharge, in t7Moment, Cd2On voltage rise to UCc+Vdc, Cu2On electricity Pressure drops to zero, which terminates.
Eight (t of stage7~t8):
As shown in figure 11, the half-bridge bridge arm of the 2nd group of prime DC/DC current transformer completes the change of current, Du2After afterflow conducting, Su2It opens It is logical, in this stage Sd1、Su2、S1、S6、S2Keep opening state, resonant inductance electric current linear rise, in t8Moment Sd1Shutdown, should Stage terminates.
Nine (t of stage8~t9):
As shown in figure 12, Sd1In t8After moment shutdown, the master up and down of the half-bridge bridge arm of the 1st group of prime DC/DC current transformer is opened It closes pipe and starts the change of current, Cd1It starts to charge, Cu1Start to discharge, in t9Moment, Cd1On voltage rise to UCc+Vdc, Cu1On electricity Pressure drops to zero, which terminates.
Ten (t of stage9~t10):
As shown in figure 13, the half-bridge bridge arm of the 1st group of prime DC/DC current transformer completes the change of current, Du1After afterflow conducting, Su1It opens It is logical, in this stage Su1、Su2、S1、S6、S2Keep opening state, resonant inductance electric current linear rise, in t10Moment S6Shutdown, should Stage terminates.
11 (t of stage10~t11):
As shown in figure 14, S6In t10After moment shutdown, the second bridge arm of rear class 3-phase power converter starts the change of current, C6Start to fill Electricity, C3Start to discharge, in t11Moment, C6On voltage rise to UCc+Vdc, C3On voltage drop to zero, which terminates.
12 (t of stage11~t12):
As shown in figure 15, the change of current, D are completed in the second bridge arm of rear class 3-phase power converter3After afterflow conducting, S3It is open-minded, herein Stage Su1、Su2、S1、S3、S2Keep opening state, resonant inductance electric current linear rise, in t12Moment S2Shutdown, stage knot Beam.
13 (t of stage12~t13):
As shown in figure 16, S2In t12After moment shutdown, the third bridge arm of rear class 3-phase power converter starts the change of current, C2Start to fill Electricity, C5Start to discharge, in t13Moment, C2On voltage rise to UCc+Vdc, C5On voltage drop to zero, which terminates.
14 (t of stage13~t14):
As shown in figure 17, the change of current, D are completed in the third bridge arm of rear class 3-phase power converter5After afterflow conducting, S5It is open-minded, herein Stage Su1、Su2、S1、S3、S5Keep opening state, resonant inductance electric current linear rise, in t14Moment S1Shutdown, stage knot Beam.
15 (t of stage14~t15):
As shown in figure 18, S1In t14After moment shutdown, the first bridge arm of rear class 3-phase power converter starts the change of current, C1Start to fill Electricity, C4Start to discharge, in t15Moment, C1On voltage rise to UCc+Vdc, C4On voltage drop to zero, which terminates.
16 (t of stage15~t16):
As shown in figure 19, the change of current, D are completed in the first bridge arm of rear class 3-phase power converter4After afterflow conducting, S4It is open-minded, herein Stage Su1、Su2、S4、S3、S5Holding opening state, resonant inductance electric current linear decline, the stage are identical as the stage one.

Claims (2)

1. a kind of multi input two-stage type three phase soft switch current transformer, it is characterised in that: the multi input two-stage type three phase soft switch Converter circuit includes n group prime DC/DC current transformer, a rear class 3-phase power converter, one group of auxiliary resonance branch and direct current Bus capacitor Cdc；The circuit form of above-mentioned n group prime DC/DC current transformer is consistent, and every group of DC/DC current transformer includes one group of half-bridge bridge Arm, an input inductance and a DC source；Every group of half-bridge bridge arm is by two concatenated full-control types comprising anti-simultaneously diode Main switch is constituted；Upper and lower main switch and its anti-and diode for the half-bridge bridge arm of kth group input current transformer are respectively Suk、SdkAnd Duk、Ddk, the midpoint of bridge arm connects inductance LkOne end, LkThe other end be connected with the anode of DC source k, DC source The negative terminal of k is connected with the lower end of bridge arm, and k is 1~n；Above-mentioned auxiliary resonance branch includes a parallel diode D7Auxiliary open Close pipe S7, resonant inductance LrWith clamping capacitance Cc, wherein auxiliary switch S7With clamping capacitance CcAfter series connection again with resonant inductance Lr It is in parallel；Above-mentioned rear class 3-phase power converter is made of three half-bridge bridge arms and three output inductors, the upper and lower master of the first bridge arm Switching tube and its anti-and diode are respectively S1、S4And D1、D4, the upper and lower main switch of the second bridge arm and its anti-and diode divide It Wei not S3、S6And D3、D6, the upper and lower main switch of third bridge arm and its anti-and diode are respectively S5、S2And D5、D2, three bridges The midpoint of arm respectively with three output inductor La、Lb、LcOne end be connected；La、Lb、LcThe other end difference three phase network connect It connects；The upper/lower terminal of three half-bridge bridge arms of the n half-bridge bridge arm and rear class 3-phase power converter of n group prime DC/DC current transformer is simultaneously Connection forms positive and negative common bus；Above-mentioned positive common DC bus and dc-link capacitance CdcAnode between access above-mentioned auxiliary Resonant branch, negative common DC bus and dc-link capacitance CdcNegative terminal be connected；Each switching tube Su1~Sun、Sd1~Sdn、S1~ S6And S7Collector and emitter both ends a resonant capacitance C in parallel respectivelyu1~Cun、Cd1~Cdn、C1~C6And C7。
2. a kind of modulator approach of multi input two-stage type three phase soft switch current transformer, it is characterised in that: the n group prime DC/DC The upper and lower main switch S of n half-bridge bridge arm of current transformeru1~Sun、Sd1~SdnIt is controlled using pulse duration modulation method, after described Grade the first bridge arm of 3-phase power converter, the second bridge arm, third bridge arm main switch S1~S6Using no-voltage sinusoidal wave pulse width tune The sine wave pulse width modulation method for making or being filled with triple-frequency harmonics is controlled, all main switches and auxiliary switch S7Pipe tool There is identical switching frequency；In each switch periods, to the n half-bridge bridge arm and rear class of above-mentioned n group prime DC/DC current transformer It is synchronized present in three half-bridge bridge arms of 3-phase power converter from diode to the switch motion moment of the main switch change of current, And auxiliary switch S is turned off before the above-mentioned switch motion moment from diode to the main switch change of current7, positive and negative public mother Line voltage resonance is zero, creates the condition that no-voltage is opened for main switch；Terminate in all diodes to supervisor's commutation course Later, resonant capacitance C7On voltage by resonance be zero, auxiliary switch S7It is open-minded to carry out no-voltage.
CN201910214716.4A 2019-03-20 2019-03-20 A kind of multi input two-stage type three phase soft switch current transformer Pending CN109980976A (en)

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Application Number Priority Date Filing Date Title
CN201910214716.4A CN109980976A (en) 2019-03-20 2019-03-20 A kind of multi input two-stage type three phase soft switch current transformer

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Application Number Priority Date Filing Date Title
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205754197U (en) * 2016-06-29 2016-11-30 国网山东省电力公司阳谷县供电公司 Photovoltaic generating system with low energy consumption auxiliary circuit
CN108352786A (en) * 2015-09-28 2018-07-31 哈佛大学校长及研究员 Driver for high-voltage capacitance formula actuator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108352786A (en) * 2015-09-28 2018-07-31 哈佛大学校长及研究员 Driver for high-voltage capacitance formula actuator
CN205754197U (en) * 2016-06-29 2016-11-30 国网山东省电力公司阳谷县供电公司 Photovoltaic generating system with low energy consumption auxiliary circuit

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