CN106787904A - The resonance polar form soft switching inverting circuit of transformer assist exchanging circuit - Google Patents

The resonance polar form soft switching inverting circuit of transformer assist exchanging circuit Download PDF

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Publication number
CN106787904A
CN106787904A CN201611087368.1A CN201611087368A CN106787904A CN 106787904 A CN106787904 A CN 106787904A CN 201611087368 A CN201611087368 A CN 201611087368A CN 106787904 A CN106787904 A CN 106787904A
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circuit
auxiliary
resonance
phase
inverter
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王强
岳远韶
韩建荣
王天施
刘晓琴
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Liaoning Shihua University
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Liaoning Shihua 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
    • 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
    • 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
    • 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
    • H02M7/4815—Resonant converters
    • 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)
  • Inverter Devices (AREA)

Abstract

The present invention relates to a kind of resonance polar form soft switching inverting circuit of transformer assist exchanging circuit, its main circuit includes dc source, three-phase pulse width modulated inverter and three-phase resistance inductive load；Three groups of identical auxiliary resonance circuits are provided between dc source and three-phase pulse width modulated inverter, three groups of A, B, C three-phases of auxiliary resonance circuit correspondence three-phase transformer, every group of resonance circuit is comprising 1 single-phase transformer, 2 auxiliary switches with anti-paralleled diode, 1 resonant inductance and 4 booster diodes.Present invention, avoiding the equalizing capacitance of Large Copacity of being connected in DC link, inverter neutral point potential variation issue is solved；Without setting the inductive current threshold value relevant with auxiliary switch control, so not needing extra detection and timing circuit；Using transformer come assist exchanging circuit, and auxiliary switch device and main switching device that each phase auxiliary circuit only has 2 auxiliary switches, inverter can realize that Sofe Switch switches.

Description

The resonance polar form soft switching inverting circuit of transformer assist exchanging circuit
Technical field
The invention belongs to electric and electronic technical field, the resonance polar form Sofe Switch of more particularly to a kind of transformer assist exchanging circuit Inverter circuit.
Background technology
Requirement more and more higher of the present industrial production to inverter switching frequency, so high frequency must turn into following inversion The dominant direction of device development, but in hard switching inverter, the switching frequency of switching device is higher, and switching loss will be more Greatly, the development trend of inverter high frequency is seriously limited.Therefore, soft switch technique is developed rapidly, when inverter work Under high frequency state, the Sofe Switch that can be very good to realize device for power switching in inverter by soft switch technique switches, and enters And reduce the switching loss of device for power switching, improve the efficiency of inverter.
In modern soft switching inverter, the performance of resonance polar form soft switching inverter is more protruded, for three contraries Become device for, the auxiliary resonance circuit of resonance polar form inverter is connected in three output ends of inverter, auxiliary resonance circuit by One group originally is changed into each phase and is provided with one group, by auxiliary resonance circuit, makes each mutually upper and lower two groups of device for power switching Tie point (i.e. limit) voltage produce resonance, be switching device no-voltage conducting or zero-current switching create conditions, it is most Big advantage is when pulsewidth modulation (pulse width modulation, PWM) is carried out to inverter circuit, it is also possible to while touching Hair auxiliary resonance circuit, is independent of each other between the two.Compared to other types of soft switching inverter, resonance polar form inverter exists It is available with more control strategies under conditions of ensureing that main switch and auxiliary switch all realize that Sofe Switch switches.
Because the premium properties that resonance polar form inverter has, it is widely used in industrial circle, various Successively studied personnel are contemplated for different auxiliary circuit topological structure, have promoted the development of the type inverter, but this A little topological structures are still present can be with improved place.For example Yao Gang et al. exists《Proceedings of the CSEE》2006 volume 26 6th phase disclosed " the new ZVS-ZCS inverters based on transformer assist exchanging circuit ", each phase of the topological circuit proposed in this article Auxiliary resonance circuit has all used 4 active auxiliary switches, this increases not only the volume and cost of inverter, and greatly increases The control difficulty of inverter；Wang Qiang et al. exists《Proceedings of the CSEE》The 27th phase of volume 29 in 2009 discloses " new Zero-voltage zero-current resonance polar form soft switching inverter ", what is proposed in this article opens up zero electricity that although portion's structure realizes main switch Stream shut-off and no-voltage are open-minded, but this is opened up portion's structure and connects two electrochemical capacitors of Large Copacity between dc bus to build Neutral point potential, so when inverter is operated in high frequency, capacitor frequently carries out discharge and recharge can cause neutral point potential to become Change, influence the normal operation of inverter；Chu's grace brightness et al. exists《Chinese journal of scientific instrument》The 6th phase of volume 30 in 2009 discloses " new The research of the active auxiliary resonance polar form inverter of type ", although what is proposed in this article opens up portion's structure not with bulky capacitor come respectively straight Stream busbar voltage, is not in neutral point potential variation issue, but auxiliary switch device can not realize zero in the topological structure Switch off current.Additionally, at present in the document on soft switching inverter, or employ bulky capacitor of being connected between dc bus Carry out respectively DC bus-bar voltage, otherwise need complicated coupling inductance and corresponding magnetic-reset circuit, have in order to ensure reality Existing Sofe Switch is, it is necessary to single detection circuit and peripheral control circuits, not only make main circuit become complicated, and also increase control Difficulty processed.
The content of the invention
The present invention is directed to above-mentioned problems of the prior art, there is provided a kind of resonance polar form of transformer assist exchanging circuit Soft switching inverting circuit, it is to avoid the equalizing capacitance of Large Copacity of being connected in DC link, solves the change of inverter neutral point potential Change problem.
The technical solution adopted by the present invention is as follows：Main circuit includes dc source, three-phase pulse width modulated inverter and three-phase Resistance inductive load；Three groups of identical auxiliary resonance circuits are provided between dc source and three-phase pulse width modulated inverter, three groups auxiliary A, B, C three-phase of resonance circuit correspondence three-phase transformer, every group of resonance circuit is helped to be carried instead comprising 1 single-phase transformer, 2 The auxiliary switch of parallel diode, 1 resonant inductance and 4 booster diodes.
Described inverter A corresponding auxiliary resonance circuit structure is：Auxiliary switch Sa1Emitter stage and dc bus N extremely be connected, auxiliary switch Sa1Colelctor electrode and auxiliary switch Sa2Emitter stage be connected, the S of auxiliary switcha2Colelctor electrode with it is straight The P for flowing bus is extremely connected, booster diode Da1And Da2Negative electrode be extremely connected with the P of dc bus respectively, booster diode Da3With Da4Anode be extremely connected with the N of dc bus respectively, booster diode Da1Anode and booster diode Da4Negative electrode be connected, Booster diode Da2Anode and booster diode Da3Negative electrode be connected, a ends of single-phase transformer primary side winding and two poles of auxiliary Pipe Da1Anode be connected, the b ends of single-phase transformer primary side winding and booster diode Da2Anode be connected, single-phase transformer pair The c ends of side winding and auxiliary switch Sa2Emitter stage be connected, the d ends of single-phase transformer vice-side winding and the L of resonant inductanceraOne End is connected, resonant inductance LraObtain the other end and main switch S1Emitter stage be connected.
When the main switch of described three-phase inverter needs switching state, by resonant inductance LraWith resonant capacitance Cr1Or Cr2Between resonance make resonant capacitance Cr1Or Cr2Terminal voltage be reduced to zero, or by resonant inductance LrbWith resonant capacitance Cr3 Or Cr4Between resonance make resonant capacitance Cr3Or Cr4Terminal voltage be reduced to zero, or by resonant inductance LrcAnd resonant capacitance Cr5Or Cr6Between resonance make resonant capacitance Cr5Or Cr6Terminal voltage be reduced to zero, opened for inverter main switch provides no-voltage Pass condition.
Described dc source is AC rectification into the straight of rectifier power source or the battery series-parallel connection generation of direct current Stream power supply；Direct current is converted to alternating current by described three-phase pulse width modulated inverter.
Advantages of the present invention effect is as follows：
Resonance polar form inverter, can be according to PWM's because its pulsewidth modulation and auxiliary resonance circuit are separate It is required that auxiliary resonance circuit is triggered at any time, it is wide for the action of inverter leg main switch provides ZVT condition General applies in industrial circle, in order to overcome the shortcomings of existing for current the type inverter, new topology proposed by the present invention Structure, it has the characteristics that：1) equalizing capacitance of Large Copacity of being connected in DC link is avoided, inverter neutral point is solved Potential change problem；2) without setting the inductive current threshold value relevant with auxiliary switch control, so not needing extra detection And timing circuit；3) using transformer come assist exchanging circuit, and each phase auxiliary circuit only has 2 auxiliary switches, inverter it is auxiliary Helping switching device and main switching device can realize that Sofe Switch switches.
Brief description of the drawings
The resonance polar form soft switching inverting circuit main circuit diagram of Fig. 1 transformer assist exchanging circuits of the present invention；
The resonance polar form soft switching inverting circuit single-phase circuit figure of Fig. 2 transformer assist exchanging circuits of the present invention；
The feature work oscillogram of Fig. 3 inverter circuits of the present invention；
Fig. 4 (a) equivalent circuit diagrams of inverter circuit pattern 1 of the present invention；The equivalent circuit diagram of 4 (b) pattern 2；4 (c) pattern 3 is equivalent Circuit diagram；The equivalent circuit diagram of 4 (d) pattern 4；The equivalent circuit diagram of 4 (e) pattern 5；The equivalent circuit diagram of 4 (f) pattern 6；4 (g) mode 7 Equivalent circuit diagram；The equivalent circuit diagram of 4 (h) pattern 8；
Fig. 5 (a) inverter circuit u of the present inventionCr1With iLrPhase-plane diagram；5(b)uCr2With iLrPhase-plane diagram；
Fig. 6 single-phase experimental circuits of the invention；
Fig. 7 (a) full loads, open S1US1And iS1Oscillogram；During 7 (b) underloading, S is opened1US1And iS1Oscillogram；7 C () full load, turns off S1US1And iS1Oscillogram；7 (d) full load, turns on and off Sa2USa2And iSa2Oscillogram；7(e) Full load, turns on and off Da2UDa2And iDa2Oscillogram；7 (f) full load, the terminal voltage u of inverter load0With electric current i0Ripple Shape figure.
Specific embodiment
First, circuit structure
A kind of reference picture 1, there is provided the resonance polar form soft switching inverting circuit main circuit diagram of transformer assist exchanging circuit.Main electricity Road includes：One dc source 1, an auxiliary resonance circuit 2, a parallel connection respectively on three the six of bridge arm main switches One three-phase inverter 3 of buffering electric capacity, a resistance inductive load 4.It is auxiliary that the present invention with the addition of three groups of identicals in DC link Resonance circuit, the three-phase (A, B, C) of correspondence three-phase transformer, every group of resonance circuit is helped to include 1 single-phase transformer, 2 bands There are auxiliary switch, 1 resonant inductance and 4 booster diodes of anti-paralleled diode.Now with inverter A corresponding auxiliary Resonant circuit structure is introduced as a example by resonance circuit.Auxiliary switch Sa1Emitter stage be extremely connected with the N of dc bus, auxiliary switch Sa1Colelctor electrode and auxiliary switch Sa2Emitter stage be connected, the S of auxiliary switcha2Colelctor electrode is extremely connected with the P of dc bus, auxiliary Help diode Da1And Da2Negative electrode be extremely connected with the P of dc bus respectively, booster diode Da3And Da4Anode respectively with direct current The N of bus is extremely connected, booster diode Da1Anode and booster diode Da4Negative electrode be connected, booster diode Da2Anode With booster diode Da3Negative electrode be connected, a ends of single-phase transformer primary side winding and booster diode Da1Anode be connected, it is single The b ends of phase transformer primary side winding and booster diode Da2Anode be connected, c ends and the auxiliary of single-phase transformer vice-side winding are opened Close Sa2Emitter stage be connected, the d ends of single-phase transformer vice-side winding and the L of resonant inductanceraOne end is connected, resonant inductance Lra The other end and main switch S1Emitter stage be connected.
When the main switch of three-phase inverter needs switching state, by resonant inductance LraWith resonant capacitance Cr1(or Cr2) Between resonance make resonant capacitance Cr1(or Cr2) terminal voltage be reduced to zero, or by resonant inductance LrbWith resonant capacitance Cr3 (or Cr4) between resonance make resonant capacitance Cr3(or Cr4) terminal voltage be reduced to zero, or by resonant inductance LrcAnd resonance Electric capacity Cr5(or Cr6) between resonance make resonant capacitance Cr5(or Cr6) terminal voltage be reduced to zero, for inverter main switch is provided ZVT condition.To simplify the analysis, hypothesis below is now done：1) device is operated in perfect condition；2) inverter switching device shape The load current I of state excessive moment0Constant, load inductance is much larger than resonant inductance；3) resonant inductance and capacitance are sufficiently large.
2nd, operation principle
Because three-phase resonance circuit can independent control, herein with the switching of its one phase equivalent circuit breaker in middle state It is analyzed as a example by journey, its single-phase circuit is as shown in Fig. 2 the reference positive direction of all physical quantitys is all referred to arrow in Fig. 2 in text To as normative reference, circuit feature work wave as shown in figure 3, what is analyzed herein is that load current is positive situation, one Single-phase circuit is divided into 8 mode of operations in individual switch periods, the equivalent circuit of each mode of operation is as shown in Figure 4.
Mode of operation：
(the t-t of pattern 10)：Assuming that during this original state for circuit, this pattern, auxiliary circuit is stopped, load Electric current I0All flow through sustained diode2, main switch S1And S2Respectively disconnect and conducting state, circuit is operated in stabilization shape State.Now, uCr1=E, uCr2=0, iLr=0.This pattern further track is a bit, as shown in Figure 5.
(the t of pattern 20- t1)：In t0Moment, shut-off main switch S2, while opening auxiliary switch Sa2, because in S2Before shut-off, There is no electric current to flow through S2, so S2Realize Zero-current soft shut-off；Because resonant inductance LrReduce and flow through Sa2Curent change Rate, so Sa2It is soft open-minded under the conditions of zero current.Work as Sa2After opening, Da2And Da4Begin to turn on, LrThe voltage for bearing is (1- K) E, LrIt is electrically charged, iLrStart linear increase, flow through resonant inductance LrElectric current iLrWith flow through sustained diode2Electric current iD2 Sum is equal to load current I0, this pattern is in t1Moment terminates, now, resonant inductance electric current iLrLinearly increase to equal to I0, afterflow Diode D2Naturally turn off.This pattern further track is t in Fig. 50- t1Section.
This mode duration is
(the t of pattern 31- t2)：In t1Moment, Lr、Cr1And Cr2Start resonance, Cr1Start electric discharge, uCr1Gradually subtract since E It is small, Cr2Start to charge up, uCr2Start from scratch and gradually increase, LrContinue to be electrically charged, iLrFrom I0Start to continue to increase.Work as uCr1It is reduced to During equal to kE, iLrIncrease to positive maximum, hereafter, LrStart electric discharge, iLrIt is gradually reduced.This pattern is in t2Moment terminates, this When, uCr1It is reduced to zero, uCr2Increase to E, iLrIt is reduced to I1.This pattern further track is t in Fig. 51- t2Section.The song of the pattern The line equation of motion is as follows：
By uCr1In=0 substitution formula (2), can obtain
By uCr1=kE is substituted into formula (2), obtains iLrPositive maximum be
In this pattern, iLr, uCr1And uCr2Expression formula be respectively
uCr1(t)=kE+ (1-k) Ecos [ωr(t-t1)] (7)
uCr2(t)=(1-k) E- (1-k) Ecos [ωr(t-t1)] (8)
Wherein Cr=Cr1+Cr2,
The duration of this pattern is
0 is understood by formula (9)<k≤1/2.
(the t of pattern 42- t3)：In t2Moment, D1Conducting, opens main switch S1, because in S1Before opening, with S1C in parallelr1 Terminal voltage have been decreased to zero, so S1Realize no-voltage open-minded.From t2Moment, LrThe backward voltage value born is KE, iLrFrom I1Start linear reduction, this pattern is in t3Moment terminates, now, iLrLinearly it is reduced to I0, D1Naturally turn off.This pattern Movement locus is t in Fig. 52- t3Section.
This mode duration is
(the t of pattern 53- t4)：In t3Moment, LrThe backward voltage value born still is kE, iLrFrom I0Start to continue linearly to subtract It is small, flow through LrElectric current iLrWith flow through S1Electric current iS1Sum is equal to load current I0, this pattern is in t4Moment terminates, now, iLrZero is reduced to, load current all flows through S1.This pattern further track is t in Fig. 53- t4Section.
This mode duration is
(the t of pattern 64- t5)：In t4Moment, shut-off auxiliary switch Sa2, because flowing through Sa2Electric current iSa2In Sa2Before shut-off Zero is reduced to, so Sa2The soft switching under the conditions of zero current.In this pattern, load current I0All flow through S1, aid in humorous The circuit that shakes does not work, and circuit reaches stable state, works as S1During shut-off, this pattern terminates.Now, uCr1=0, uCr2=E, iLr=0. This pattern further track is a bit, as shown in Figure 5.
Mode 7 (t5- t6)：In t5At the moment, open Sa1, simultaneously turn off S1, because LrReduce Sa1On electric current when opening The rate of liter, it is achieved that Sa1Zero-current soft open operation；Because in shut-off S1When, with S1Resonant capacitance C in parallelr1Reduce The terminal voltage climbing of its shutdown moment, it is achieved that S1Zero-voltage soft shut-off operation.Sa1After opening, Da1And Da3Conducting, Lr、Cr1And Cr2Start resonance, Cr1It is electrically charged, uCr1Start from scratch and gradually increase, Cr2Electric discharge, uCr2It is gradually reduced since E, iLr Start from scratch and inversely increase, work as Cr2Terminal voltage uCr2It is reduced to during equal to kE, iLrMaximum is just inversely increased, then LrOpen Begin to discharge, iLrIt is gradually reduced, Cr1Continue to charge, Cr2Continue to discharge, this pattern is in t6Moment terminates, now uCr2It is reduced to and is equal to Zero, uCr1Increase to equal to E, iLrReversely it is reduced to equal to I2.This pattern further track is t in Fig. 55- t6Section.The song of the pattern The line equation of motion is as follows：
By uCr2In=0 substitution formula (13), can obtain
By uCr2=kE is substituted into formula (13), iLrReverse maximum be
I in this patternLr, uCr1And uCr2Expression formula be respectively
uCr1(t)=(1-k) E- (1-k) Ecos [ωr(t-t5)]+I0Zrsin[ωr(t-t5)] (17)
uCr2(t)=kE+ (1-k) Ecos [ωr(t-t5)]-I0Zrsin[ωr(t-t5)] (18)
The duration of this pattern is
(the t of pattern 86- t7)：In t6At the moment, open S2, because in S2Before opening, with S2Resonant capacitance C in parallelr2End electricity Pressure has been decreased to zero, so S2Realize no-voltage open-minded.From t6Moment, D2Conducting, iLrFrom I2Start to reduce, in t7 Moment, iLrIt is reduced to zero, load current I0All through D2Afterflow, auxiliary resonance circuit power cut-off, this pattern terminates.In t7When Carve, turn off Sa1, because in shut-off Sa1Before, flow through Sa1Electric current iLrZero is had been decreased to, so Sa1Realize zero-current switching. This pattern further track is t in Fig. 56- t7Section.
This mode duration is
t7After moment, circuit returns to pattern 1, repeats whole work process.So far, under positive load current, electricity The pattern analysis of running status terminates in Lu Yi complete switch periods, and circuit is in the case where load current is negative Mode of operation is similar, and labor is no longer done here.According to the curvilinear motion equation of the circuit in a switch periods, can To draw out the movement locus in phase plane, as shown in Figure 5.
It should be noted that transformer has been used in circuit, as transformer primary side winding n1When flowing through electric current, primary side winding n1 The magnitude of voltage for bearing is E, and the electric current of primary side winding passes through Da2And Da4(Da1And Da3) afterflow flows into dc source, makes dc source Without the positive transmission energy of normal load, duty-cycle loss can be caused.As shown in Figure 3 in t0To t4And t5To t7This two sections auxiliary are opened Duty-cycle loss can occur in the time that pass is on.To reduce duty-cycle loss, in the control of auxiliary circuit, should try one's best Reduce the dutycycle of auxiliary switch.By formula (1), (9), (10), (11), (19) and (20) understand Lr、Cr1And Cr2Take as far as possible smaller Value is conducive to reducing ON time of the auxiliary switch in each switch periods, and then can reduce duty-cycle loss.
3rd, Sofe Switch realizes condition
Analysis can obtain following Sofe Switch and realize condition according to more than：
1. in order that auxiliary switch Sa1And Sa2Zero current turning-on is realized in full-load range, it is necessary to formula (21) is set up.
WhereinWithRespectively Sa1And Sa2The current changing rate of moment is opened,For switching device is allowed Current changing rate.
2. in order that auxiliary switch Sa1And Sa2Zero-current switching is realized in full-load range, it is necessary to formula (22) and (23) Set up.
Wherein Ton(Sa1)And Ton(Sa2)Respectively Sa1And Sa2The time in opening state, I in each switch periods0max It is load current maximum.
3. want on the premise of the normal operating condition for not influenceing inverter, inverter master to be realized in full-load range The Zero-voltage soft switch switching of switch, it is necessary to assure in the Dead Time Δ of soft switching inverter, will be in parallel with main switch Electricity contained by resonant capacitance is all released.The main switch S on bridge arm on inverter is opened under zero voltage condition1, then must Must meet
The main switch S on bridge arm under inverter is opened under zero voltage condition2, then it must is fulfilled for
It is in full-load range while the main switch S realized on inverter upper and lower bridge arm from formula (24) and (25)1With S2No-voltage it is open-minded, it is desirable to meet
4. in order that main switch realizes zero voltage turn-off in full-load range, it is necessary to formula (28) is set up.
WhereinIt is the voltage change ratio of main switch OFF moment,For the voltage change that switching device is allowed Rate.
Analyzed more than, load current maximum I0maxInfluence whether that the Sofe Switch in full-load range realizes bar Part, works as I0maxAfter being determined, loadtype (resistive or perception) does not interfere with the realization of Sofe Switch.5th, device holds in circuit The voltage and current stress received
Flow through LrMaximum current value iLrmaxFor
Flow through transformer first winding n1With Secondary Winding n2Maximum current value in1maxAnd in2maxRespectively
Flow through Sa1And Sa2Maximum current value iSa1maxAnd iSa2maxRespectively
Flow through Da1、Da2、Da3And Da4Maximum current value iDa1max, iDa2max, iDa3maxAnd iDa4maxRespectively
Analyzed according to more than, with ZrIncrease, flow through resonant inductance, transformer, auxiliary switch and booster diode Electric current can all reduce.Additionally, the magnitude of voltage no more than DC bus-bar voltage that all device for power switching in circuit are born E, the electric current for flowing through main switching device is no more than load current I0.So in I0Take maximum I0maxWhen, calculating device bears most High current, then carries out parts selection further according to E.
6th, single-phase auxiliary circuit power attenuation analysis
It can be seen from theory analysis according to the mode of operation be given in text, the auxiliary switch device S of invertera1And Sa2, it is main to open Close device S1And S2All realize Sofe Switch switching, wherein Sa1And Sa2Realize zero-current soft switch, S1And S2Realize no-voltage Sofe Switch, switching loss is all zero.Auxiliary switch Sa1And Sa2And booster diode Da1、Da2、Da3And Da4There is on-state loss.Reason Under thinking state, because Lr, Cr1And Cr2And the resistance very little of Transformer Winding, Lr, Cr1And Cr2And Transformer Winding power consumption can be near It is seemingly zero.If auxiliary switch device Sa1And Sa2On-state voltage drop is VCE, booster diode Da1、Da2、Da3And Da4On-state voltage drop be VEC, switching frequency is fc.According to the theory analysis of each mode of operation in a switch periods, can be obtained using sectional integration method To the power attenuation Mathematical Modeling of each device of single-phase auxiliary circuit.
Sa1And Sa2On-state loss PSa1And PSa2Can be expressed as
Diode Da1、Da2、Da3And Da4On-state loss PDa1、PDa2、PDa3And PDa4Can be expressed as
Single-phase auxiliary resonance circuit total power consumption PaddIt is represented by
P can be obtained according to formula (40)addMaximum PaddmaxIt is expressed as
Next P is usedaddmaxRespectively to LrAnd CrLocal derviation is sought to study LrAnd CrInfluence of the change to power attenuation.
From formula (42), with LrIncrease, the power attenuation of auxiliary resonance circuit can increase, so meeting soft opening Close and realize in the premise of condition, LrMinimum value is taken as far as possible.
From formula (43), with CrIncrease, the power attenuation of auxiliary resonance circuit can increase, so meeting soft opening Close and realize in the premise of condition, CrMinimum value is taken as far as possible.
7th, parameter designing process
Known conditions：Direct current power source voltage E, load current maximum I0max, the current changing rate that switching device is allowedThe voltage change ratio that switching device is allowedDead Time Δ, switching frequency fc, the turn ratio of Transformer Winding is n2:n1=k.Design process is as follows：
To realize the zero current turning-on of auxiliary switch, obtained by formula (21)
In view of LrTo auxiliary circuit loss and the influence of duty-cycle loss, LrShould try one's best and take smaller value.It is certain to leave Allowance, takes LrFor
To realize the zero voltage turn-off of main switch, obtained by formula (28)
In view of CrTo auxiliary circuit loss and the influence of duty-cycle loss, CrShould try one's best and take smaller value.It is certain to leave Allowance, takes CrFor
Lr, CrEach known quantity is updated in formula (26) and (27) with more than, comes whether certificate parameter is met in full load model Enclosing interior main switch can realize that no-voltage is open-minded.
After being verified, above parameter is updated in formula (22) and (23), T can be calculatedon(Sa1)And Ton(Sa2)。Sa1 And Sa2Dutycycle be respectively
ρSa1=fcTon(Sa1) (48)
ρSa2=fcTon(Sa2) (49)
Work as Sa1And Sa2Dutycycle when meeting formula (48) and (49), zero-current switching can be realized in full-load range.
8th, experimental result
A single-phase experimental prototype of 4kW, experimental circuit have been made as shown in fig. 6, this model machine input uses 2 450V/3300 μ F high-voltage electrolytic capacitors first connect after in parallel with dc source, output one resistance of 2.5 Ω of termination is used as negative Carry, filter inductance electric capacity is accessed between resistance and inverter main switch bridge arm.The setting of device parameters value is as follows in experimental circuit： Direct current power source voltage E=400V, resonant capacitance Cr1=Cr2=0.1 μ F, resonant inductance Lr=12 μ H, Transformer Winding turn ratio k =0.4, the inductance L of output filtera=1.45mH, the electric capacity C of output filtera=12 μ F, Dead Time Δ=3 μ s, switch Frequency fc=6.5kHz, output frequency f0=50Hz, output voltage virtual value u0=100V, output current virtual value i0=40A, Main switch uses sinusoidal pulse width modulation method, modulation degree M=0.8, and the dutycycle of auxiliary switch trigger pulse is 0.1.Auxiliary two Pole pipe Da1、Da2、Da3And Da4Model and parameter be fast recovery diode HFA30TA60C (600V/30A), main switching device S1And S2, auxiliary switch device Sa1And Sa2Model and parameter be module SKM50GB123D (two-tube 1200V/50A).
Full load, opens S1US1And iS1Waveform such as Fig. 7 (a)；During underloading, S is opened1US1And iS1Waveform such as Fig. 7 (b). It can be seen that in S1Before opening, its terminal voltage uS1Zero is first reduced to, S is opened1Electric current i afterwardsS1Just begin to ramp up, So S1It is soft open-minded under zero voltage condition, wherein underloading when, iS1Inversely increase, illustrate that electric current begins to flow through S1Inverse parallel two Pole pipe D1.Full load, turns off S1US1And iS1Shown in waveform such as Fig. 7 (c), it can be seen that in shut-off S1When, S1End Voltage slowly rises, and the speed of rising is smaller, so main switch S1The soft switching under zero voltage condition.Turn on and off Sa2's uSa2And iSa2Shown in waveform such as Fig. 7 (d), it can be seen that in Sa2When opening, S is flowed througha2Electric current slowly rise, rise Speed it is smaller, so Sa2It is soft open-minded under the conditions of zero current, in Sa2Before shut-off, S is flowed througha2Electric current iSa2It has been reduced to Zero, so Sa2The soft switching under the conditions of zero current.Turn on and off Da2UDa2And iDa2Shown in waveform such as Fig. 7 (e), from figure As can be seen that Da2When opening, D is flowed througha2Electric current iDa2Slow to rise, the speed of rising is smaller, so Da2In zero current condition Under it is soft open-minded, in Da2Before shut-off, D is flowed througha2Electric current iDa2Zero is reduced to, so Da2The soft switching under the conditions of zero current. The terminal voltage u of inverter load0With electric current i0Shown in waveform such as Fig. 7 (f), it can be seen that inverter output voltage and defeated The waveform for going out electric current is good, is all sine wave.
In order to verify advantage of the proposed active resonance polar form soft switching inverter in efficiency, in identical experiment Under the conditions of test respectively soft switching inverter and hard switching inverter single-phase experimental circuit efficiency, in the output of inverter When power is 4kW, actually measured efficiency is 96.8%, compared with the efficiency of traditional hard switching inverter, set forth herein The efficiency of Novel Soft Switching inverter improves 2.5%.

Claims (5)

1. the resonance polar form soft switching inverting circuit of a kind of transformer assist exchanging circuit, it is characterised in that main circuit includes direct current Source, three-phase pulse width modulated inverter and three-phase resistance inductive load；Three are provided between dc source and three-phase pulse width modulated inverter Group identical auxiliary resonance circuit, three groups of A, B, C three-phases of auxiliary resonance circuit correspondence three-phase transformer, every group of resonance circuit is equal Comprising 1 single-phase transformer, 2 auxiliary switches with anti-paralleled diode, 1 resonant inductance and 4 booster diodes.
2. inverter A described in corresponding auxiliary resonance circuit structure is：Auxiliary switch Sa1Emitter stage and dc bus N Extremely it is connected, auxiliary switch Sa1Colelctor electrode and auxiliary switch Sa2Emitter stage be connected, the S of auxiliary switcha2Colelctor electrode is female with direct current The P of line is extremely connected, booster diode Da1And Da2Negative electrode be extremely connected with the P of dc bus respectively, booster diode Da3And Da4's Anode is extremely connected with the N of dc bus respectively, booster diode Da1Anode and booster diode Da4Negative electrode be connected, auxiliary Diode Da2Anode and booster diode Da3Negative electrode be connected, a ends of single-phase transformer primary side winding and booster diode Da1 Anode be connected, the b ends of single-phase transformer primary side winding and booster diode Da2Anode be connected, single-phase transformer vice-side winding C ends and auxiliary switch Sa2Emitter stage be connected, the d ends of single-phase transformer vice-side winding and the L of resonant inductanceraOne end is connected, Resonant inductance LraObtain the other end and main switch S1Emitter stage be connected.
3. a kind of resonance polar form soft switching inverting circuit of transformer assist exchanging circuit according to claim 1, its feature exists When the main switch of described three-phase inverter needs switching state, by resonant inductance LraWith resonant capacitance Cr1Or Cr2Between Resonance make resonant capacitance Cr1Or Cr2Terminal voltage be reduced to zero, or by resonant inductance LrbWith resonant capacitance Cr3Or Cr4It Between resonance make resonant capacitance Cr3Or Cr4Terminal voltage be reduced to zero, or by resonant inductance LrcWith resonant capacitance Cr5Or Cr6 Between resonance make resonant capacitance Cr5Or Cr6Terminal voltage be reduced to zero, for inverter main switch provides ZVT condition.
4. a kind of resonance polar form soft switching inverting circuit of transformer assist exchanging circuit according to claim 1, its feature exists It is the dc source that AC rectification is produced into the rectifier power source or battery series-parallel connection of direct current in described dc source.
5. a kind of resonance polar form soft switching inverting circuit of transformer assist exchanging circuit according to claim 1, its feature exists Direct current is converted to alternating current in described three-phase pulse width modulated inverter.
CN201611087368.1A 2016-11-30 2016-11-30 The resonance polar form soft switching inverting circuit of transformer assist exchanging circuit Pending CN106787904A (en)

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CN111490698A (en) * 2020-04-16 2020-08-04 山西大学 Auxiliary resonance converter pole inverter with minimized phase-correlated ZVT magnetizing current
CN111555648A (en) * 2020-05-14 2020-08-18 深圳市德兰明海科技有限公司 Inverter circuit
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111490698A (en) * 2020-04-16 2020-08-04 山西大学 Auxiliary resonance converter pole inverter with minimized phase-correlated ZVT magnetizing current
CN111934576A (en) * 2020-04-16 2020-11-13 山西大学 Auxiliary resonance converter pole inverter with phase-correlated magnetizing current symmetric reset
CN111490698B (en) * 2020-04-16 2022-03-18 山西大学 Auxiliary resonance converter pole inverter with minimized phase-correlated ZVT magnetizing current
CN111464065A (en) * 2020-05-11 2020-07-28 南京大学 Soft switching inverter topology circuit and control method
CN111555648A (en) * 2020-05-14 2020-08-18 深圳市德兰明海科技有限公司 Inverter circuit
CN112953289A (en) * 2021-04-15 2021-06-11 哈尔滨工业大学 Resonant direct-current link soft switching inverter and modulation method thereof
CN112953289B (en) * 2021-04-15 2022-11-22 哈尔滨工业大学 Resonant direct-current link soft switching inverter and modulation method thereof
CN117040300A (en) * 2023-10-09 2023-11-10 深圳市德兰明海新能源股份有限公司 Inverter circuit and multiphase inverter

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