CN102969925B - Without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter and modulator approach - Google Patents

Without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter and modulator approach Download PDF

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CN102969925B
CN102969925B CN201210429380.1A CN201210429380A CN102969925B CN 102969925 B CN102969925 B CN 102969925B CN 201210429380 A CN201210429380 A CN 201210429380A CN 102969925 B CN102969925 B CN 102969925B
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switch
voltage
main switch
electric capacity
inverter
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CN102969925A (en
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李睿
张峰
蔡旭
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Shanghai Zhonglv New Energy Technology Co ltd
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Shanghai Jiaotong University
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    • 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 invention provides a kind of without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter and modulator approach, comprise DC side storage battery, DC side derided capacitors, AC filter inductance, the single-phase brachium pontis having the full control main switch of anti-paralleled diode to form by two, the auxiliary switch of anti-paralleled diode is had access to, main switch and auxiliary switch two ends shunt capacitance, the resonant branch that the cross-over connection of auxiliary switch two ends is connected with clamping capacitance by resonant inductance between derided capacitors and single-phase brachium pontis DC bus.Bringing onto load independent operating of the present invention or be incorporated into the power networks.Main switch adopts sine wave pulse width modulation method, and auxiliary switch modulation signal is synchronous with main switch.In each switch periods, once just to realize all main switch no-voltages open-minded in an auxiliary switch action, main switch anti-paralleled diode reverse recovery current is inhibited, switching voltage stress equals DC side voltage of converter, switching loss is little, circuit efficiency is high, be conducive to improving operating frequency, and then improve power density.

Description

Without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter and modulator approach
Technical field
The present invention relates to half-bridge inverter, particularly, relate to the circuit topology without auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter and modulator approach.
Background technology
Have the battery energy storage single phase half bridge inverter of generate electricity by way of merging two or more grid systems operation and bringing onto load independent operation function, as shown in Figure 1, it comprises the full control main switch S having anti-paralleled diode by two to its circuit simultaneously 1~ S 2the single-phase brachium pontis formed, is connected on the output inductor L between brachium pontis mid point and load or AC network.This inverter can realize independent invert function, also can realize operation of generating electricity by way of merging two or more grid systems, but circuit working is in hard switching state, there is the reverse-recovery problems of diode, devices switch loss is large, limits the raising of operating frequency, reduces circuit efficiency and there is larger electromagnetic interference.
Through retrieval, publication number is the Chinese patent application of 101667793A, the invention provides a kind of combining inverter, comprise DC power supply, the memory module be connected with DC power supply, the inversion module that is connected with memory module, and the output module be connected with inversion module and electrical network respectively, and the continuous current circuit be connected with inversion module and output module respectively.In the invention, on the basis of the full-bridge grid-connected inverter of traditional single phase, coordinate corresponding modulation system by introducing continuous current circuit simultaneously, thus efficiently solve the full-bridge grid-connected inverter of the traditional single phase problem existing when adopting bipolar modulation and adopt unipolarity modulation, thus improve conversion efficiency and the Electro Magnetic Compatibility of inverter.
Publication number is the Chinese patent application of 102163934A, and this invention relates to a kind of combining inverter, and it comprises: four inverter transistors, two afterflow transistors, two diodes and two filter inductances; During work; microcontroller makes the first afterflow transistor turns half power frequency period; make the one or four inverter transistor and the second afterflow transistor cutoff simultaneously; and make second, third inverter transistor under the synchronous triggering of described high frequency trigger signal, make high-frequency synchronous to switch, to make the positive half cycle of the outboard end output AC power source of the one the second filter inductances; Then described microcontroller makes the second afterflow transistor turns half power frequency period, make second, third inverter transistor and the first afterflow transistor cutoff simultaneously, the first, the 4th inverter transistor does high-frequency synchronous switching under the synchronous triggering of described high frequency trigger signal, to make the negative half period of the outboard end output AC power source of first, second filter inductance, so repeatedly.
Compared with the Chinese patent application being 101667793A with publication number, first: the topology that the present invention proposes is a kind of Zero-voltage switch half-bridge inverter; Secondly, the control strategy main purpose proposed in 101667793A is the electromagnetic compatibility problem reducing the lower single-phase grid-connected inverter of unipolarity modulation, and the present invention is by increasing an auxiliary tube, the no-voltage realizing all switches is open-minded, effective twin zener dioder Reverse recovery, both can improve inverter efficiency, also can improve Electro Magnetic Compatibility.Finally, the semi-bridge type inverter that the present invention proposes can not only be operated in and net state, also can be operated in band AC load independence inverter mode.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of can the reverse recovery current of twin zener dioder, reduce switching loss, improve circuit efficiency, reduce electromagnetic interference and realize that switch tube zero voltage opens without auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter and modulator approach.
According to an aspect of the present invention, provide a kind of without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter, comprise inverter direct-flow side storage battery, DC side derided capacitors C 1, C 2, the single-phase brachium pontis having the full control main switch of anti-paralleled diode to form by two, is connected on the output inductor L between brachium pontis mid point and output loading or AC network, wherein: two main switch S of single-phase brachium pontis 1, S 2an electric capacity in parallel i.e. the first electric capacity C respectively r1, the second electric capacity C r2, at inverter DC partial voltage electric capacity C 1, C 2and between the DC bus of single-phase brachium pontis, have access to the auxiliary switch S of anti-paralleled diode 3, auxiliary switch S 3two ends 3rd electric capacity C in parallel r3, and at auxiliary switch S 3two ends cross-over connection is by resonant inductance L rwith clamping capacitance C cthe resonant branch be in series.
According to another aspect of the present invention, provide a kind of modulator approach without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter, wherein: main switch adopts double polarity sine pulse duration modulation method, and auxiliary switch modulation signal is synchronous with main switch modulation signal.Auxiliary switch turned off from the diode change of current at main switch before full control switch, creates no-voltage open condition for main switch.When inverter DC bus current flows to DC side by AC, within the blink that auxiliary switch turns off, upper and lower two Switch Cut-through of main switch brachium pontis provide freewheeling path to resonant inductance, make resonant inductance stored energy be enough to realize inverter soft switching.When grid-connected inverters, inverter zero voltage switch all can realize in ac-side current total power factor angular region.When inverter bringing onto load independent operating, inverter zero voltage switch all can realize in load current total power factor angular region, meets battery energy storage inverter energy two-way flow requirement.
Compared with prior art, the present invention has following beneficial effect:
Of the present invention simple without auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter structure, in inverter, the Reverse recovery of the anti-paralleled diode of full control switch is inhibited, and decreases electromagnetic interference.In circuit, to realize no-voltage open-minded for all device for power switching, thus reduce switching loss, improves circuit efficiency, is conducive to improving operating frequency, and then improves power density.The circuit of this inverter and the control that can realize under net state output voltage amplitude, phase place and harmonic wave, can be used for parallel network reverse or independent inverter in various batteries to store energy.In addition, the circuit of this inverter also can be used for independent inverter in various power supply.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is existing single-phase inverter;
Fig. 2 is a kind of physical circuit figure of the present invention;
Fig. 3 is the second physical circuit figure of the present invention;
Fig. 4 is the third physical circuit figure of the present invention;
Fig. 5 is the 4th kind of physical circuit figure of the present invention;
Fig. 6 is output voltage, the current waveform figure of one embodiment of the invention when being operated in unity power factor inversion;
Fig. 7 is the Pulse Width Control sequential chart of one embodiment of the invention when DC bus energy is flowed to AC by DC side storage battery;
Fig. 8 ~ Figure 15 is the work equivalent electric circuit of one embodiment of the invention switch periods when DC bus energy is flowed to AC by DC side storage battery;
Figure 16 is mains voltage and the current waveform of one embodiment of the invention switch periods when DC bus energy is flowed to AC by DC side storage battery;
Figure 17 is the Pulse Width Control sequential chart of one embodiment of the invention when DC bus energy is flowed to DC side storage battery by AC;
Figure 18 ~ Figure 26 is the work equivalent electric circuit of one embodiment of the invention switch periods when DC bus energy is flowed to DC side storage battery by AC;
Figure 27 is mains voltage and the current waveform of one embodiment of the invention switch periods when DC bus energy is flowed to DC side storage battery by AC.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
With reference to Fig. 2, of the present invention without auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter, comprise DC side storage battery, DC side derided capacitors C 1~ C 2, the full control main switch S of anti-paralleled diode is had by two 1~ S 2the single-phase brachium pontis formed, is connected on the output inductor L between brachium pontis mid point and AC network or load, wherein: two main switch S of single-phase brachium pontis 1~ S 2an electric capacity in parallel i.e. the first electric capacity C respectively r1, the second electric capacity C r2, at DC side derided capacitors C 1~ C 2and between the DC bus of single-phase brachium pontis, have access to the auxiliary switch S of anti-paralleled diode 3, auxiliary switch S 3two ends 3rd electric capacity C in parallel r3, and at auxiliary switch S 3two ends cross-over connection is by resonant inductance L rwith clamping capacitance C cthe resonant branch be in series.
In specific embodiment shown in Fig. 2, auxiliary switch S 3collector electrode is connected with inverter direct-flow side storage battery anode, and emitter is connected with single-phase brachium pontis positive bus-bar, resonant inductance L rbe connected with single-phase brachium pontis positive bus-bar, clamping capacitance C cbe connected with inverter direct-flow side storage battery anode.
In another embodiment shown in Fig. 3, auxiliary switch S 3collector electrode is connected with inverter direct-flow side storage battery anode, and emitter is connected with single-phase brachium pontis positive bus-bar, clamping capacitance C cbe connected with single-phase brachium pontis positive bus-bar, resonant inductance L rbe connected with inverter direct-flow side storage battery anode
In another embodiment shown in Fig. 4, auxiliary switch S 3emitter is connected with inverter direct-flow side storage battery negative terminal, and collector electrode is connected with single-phase brachium pontis negative busbar, clamping capacitance C cbe connected with single-phase brachium pontis negative busbar, resonant inductance L rbe connected with inverter direct-flow side storage battery negative terminal.
In another embodiment shown in Fig. 5, auxiliary switch S 3emitter is connected with inverter direct-flow side storage battery negative terminal, and collector electrode is connected with single-phase brachium pontis negative busbar, resonant inductance L rbe connected with single-phase brachium pontis negative busbar, clamping capacitance C cbe connected with inverter direct-flow side storage battery negative terminal.
SPWM modulation is adopted without auxiliary voltage Zero-voltage switch half-bridge inverter.
SPWM is divided into unipolarity and bipolarity.During bipolar modulation, within the whole modulating wave cycle, the complementary conducting of S1, S2.The present invention adopts bipolar modulation.
If Sine Modulated voltage is u ref=msin (ω t), when adopting bipolar modulation, switch S 1 duty ratio D = 1 2 [ 1 + m sin ( ωt ) ] , Switch S 2 duty ratio D = 1 2 [ 1 - m sin ( ωt ) ] .
For without auxiliary voltage Zero-voltage switch half-bridge inverter, time different in inverter direct-flow side bus current direction, inverter control is different, here just for analyzing respectively without the switch periods of auxiliary voltage Zero-voltage switch half-bridge inverter when DC bus current is flowed to AC by DC side and when DC bus current flows to DC side by AC shown in Fig. 2.
When DC bus current is flowed to AC by DC side, the switching pulse Control timing sequence of inverter as shown in Figure 7.In a switch duty cycle, inverter has 8 operating states.Fig. 8 is the work equivalent electric circuit of a switch periods when DC bus energy is flowed to AC by DC side storage battery.Mains voltage during work and current waveform are as shown in Figure 9.
Stage 1(t 0-t 1):
As shown in Figure 8, main switch S 2with auxiliary switch S 3be in conducting state, main switch S 1close, load current is through main switch S 2anti-paralleled diode afterflow.
Stage 2(t 1-t 2):
As shown in Figure 9, t 1moment turns off auxiliary switch S 3.Inductance L rwith electric capacity C r3, C r1resonance, electric capacity C r3both end voltage increases, electric capacity C r1both end voltage reduces.
Stage 3(t 2-t 3):
As shown in Figure 10, t 2moment, electric capacity C r1voltage is reduced to zero, main switch S 1backward diode conducting, resonance terminates.
Stage 4(t 3-t 4):
As shown in figure 11, t 3moment, main switch S 1no-voltage is open-minded.Main switch S 1with S 2the anti-paralleled diode change of current, due to L rthere is S 2the reversely restoring process of anti-paralleled diode is suppressed.
Stage 5(t 4-t 5):
As shown in figure 12, t 4in the moment, the change of current terminates, main switch S 2anti-paralleled diode electric current is reduced to zero.Inductance L rwith electric capacity C r3, C r2resonance, electric capacity C r2both end voltage increases, electric capacity C r3both end voltage reduces.
Stage 6(t 5-t 6):
As shown in figure 13, t 5moment, electric capacity C r3voltage is reduced to zero, auxiliary switch S 3backward diode conducting, resonance terminates.Auxiliary switch S 3no-voltage is open-minded.
Stage 7(t 6-t 7):
As shown in figure 14, t 6moment, main switch S 1turn off.Load current is to electric capacity C r2electric discharge, to electric capacity C r1charging.
Stage 8(t 7-t 8):
As shown in figure 15, t 7moment, electric capacity C r1voltage increases to V dc; Electric capacity C r2voltage is reduced to zero, and load current is through main switch S 2anti-paralleled diode afterflow.Main switch S 2no-voltage is open-minded, t 8moment t 0moment circuit state is identical, repeats next cycle.
When DC bus current is flowed to DC side by AC, the switching pulse Control timing sequence of inverter as shown in figure 17.In a switch duty cycle, inverter has 9 operating states.Figure 19 ~ Figure 26 is the work equivalent electric circuit of a switch periods when DC bus energy is flowed to DC side storage battery by AC.Mains voltage during work and current waveform are as shown in figure 27.
Stage 1 (t 0-t 1):
As shown in figure 18, main switch S 1with auxiliary switch S 3be in conducting state, main switch S 2close, load current is through main switch S 1anti-paralleled diode afterflow.
Stage 2(t 1-t 2):
As shown in figure 19, t 1moment turns off main switch S 3.Inductance L rwith electric capacity C r3, C r2resonance, electric capacity C r3both end voltage increases, electric capacity C r2both end voltage reduces.
Stage 3(t 2-t 3):
As shown in figure 20, t 2moment, electric capacity C r2voltage is reduced to zero, main switch S 2backward diode conducting, resonance terminates.
Stage 4(t 3-t 4):
As shown in figure 21, t 3moment, S 2no-voltage is open-minded.Main switch S 2with S 1the anti-paralleled diode change of current, due to L rthere is main switch S 1the reversely restoring process of anti-paralleled diode is suppressed.
Stage 5(t 4-t 5):
As shown in figure 22, t 4in the moment, the change of current terminates, main switch S 1anti-paralleled diode electric current is reduced to zero.Now for realizing Sofe Switch, no-voltage opens main switch S 1, bridge arm direct pass, to L rmagnetize.
Stage 6(t 5-t 6):
As shown in figure 23, t 5in the moment, turn off main switch S 1.Inductance L rwith electric capacity C r3, C r1resonance, electric capacity C r1both end voltage increases, electric capacity C r3both end voltage reduces.
Stage 7(t 6-t 7):
As shown in figure 24, t 6moment, electric capacity C r3voltage is reduced to zero, main switch S 3backward diode conducting, resonance terminates.Main switch S 3no-voltage is open-minded.
Stage 8(t 7-t 8):
As shown in figure 25, t 7moment, main switch S 2turn off.Load current is to electric capacity C r1electric discharge, to electric capacity C r2charging.
Stage 9(t 8-t 9):
As shown in figure 26, t 8moment, electric capacity C r2voltage increases to V dc; Electric capacity C r1voltage is reduced to zero, and load current is through S 1anti-paralleled diode afterflow.Main switch S 1no-voltage is open-minded, t 9moment t 0moment circuit state is identical, repeats next cycle.
Be more than a preferred embodiment of the present invention, for the embodiment shown in Fig. 3-5, it is specifically implemented with above-mentioned embodiment illustrated in fig. 2 similar, no longer describes in detail.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (4)

1. without a modulator approach for auxiliary voltage zero voltage switch energy storage semi-bridge type inverter, it is characterized in that: describedly comprise inverter direct-flow side storage battery without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter, DC side derided capacitors (C 1, C 2), the single-phase brachium pontis having the full control main switch of anti-paralleled diode to form by two, is connected on the output inductor (L) between brachium pontis mid point and output loading anode or AC network phase line; Two main switches i.e. first main switch (S of single-phase brachium pontis 1), the second main switch (S 2) difference the first electric capacity (C in parallel r1), the second electric capacity (C r2), at inverter DC partial voltage electric capacity (C 1, C 2) and the DC bus of single-phase brachium pontis between have access to the auxiliary switch (S of anti-paralleled diode 3), auxiliary switch (S 3) two ends 3rd electric capacity (C in parallel r3), and at auxiliary switch (S 3) two ends cross-over connection is by resonant inductance (L r) and clamping capacitance (C c) resonant branch that is in series; Described auxiliary switch (S 3) collector electrode is connected with inverter direct-flow side storage battery anode, emitter is connected with single-phase brachium pontis positive bus-bar, resonant inductance (L r) be connected with single-phase brachium pontis positive bus-bar, clamping capacitance (C c) be connected with inverter direct-flow side storage battery anode; DC side derided capacitors (C 1, C 2) mid point be connected with AC network zero line or AC load negative terminal;
Described main switch adopts double polarity sine pulse duration modulation method, and auxiliary switch modulation signal is synchronous with main switch modulation signal; Auxiliary switch turned off from the diode change of current at main switch before full control switch, creates no-voltage open condition for main switch; When inverter DC bus current flows to DC side by AC, within the blink that auxiliary switch turns off, upper and lower two Switch Cut-through of main switch brachium pontis provide freewheeling path to resonant inductance, make resonant inductance stored energy be enough to realize inverter soft switching; Inverter zero voltage switch all can realize in the electric current total power factor angular region of inverter ac side;
If Sine Modulated voltage is u ref=msin (ω t), when adopting bipolar modulation, the first main switch (S 1) duty ratio D = 1 2 [ 1 + m sin ( ωt ) ] , Second main switch S 2duty ratio D = 1 2 [ 1 - m sin ( ωt ) ] ; Wherein m is inverter modulation ratio, equals the ratio of inverter sine wave output Voltage Peak peak value and inverter direct-current voltage;
For without auxiliary voltage Zero-voltage switch half-bridge inverter, when described inverter direct-flow side bus current direction is different, inverter control is different:
The switching pulse Control timing sequence of inverter when DC bus current is flowed to AC by DC side, in a switch duty cycle, described inverter has 8 operating states:
Stage 1 (t 0-t 1):
Second main switch (S 2) and auxiliary switch (S 3) be in conducting state, the first main switch (S 1) close, load current is through the second main switch (S 2) anti-paralleled diode afterflow;
Stage 2 (t 1-t 2):
T 1moment turns off auxiliary switch (S 3), resonant inductance (L r) and the 3rd electric capacity (C r3), the first electric capacity (C r1) resonance, the 3rd electric capacity (C r3) both end voltage increase, the first electric capacity (C r1) both end voltage reduction;
Stage 3 (t 2-t 3):
T 2moment, the first electric capacity (C r1) voltage is reduced to zero, the first main switch (S 1) backward diode conducting, resonance terminates;
Stage 4 (t 3-t 4):
T 3moment, the first main switch (S 1) no-voltage is open-minded, the first main switch (S 1) and the second main switch (S 2) the anti-paralleled diode change of current, due to resonant inductance (L r) existence second main switch (S 2) reversely restoring process of anti-paralleled diode is suppressed;
Stage 5 (t 4-t 5):
T 4in the moment, the change of current terminates, the second main switch (S 2) anti-paralleled diode electric current is reduced to zero, resonant inductance (L r) and the 3rd electric capacity (C r3), the second electric capacity (C r2) resonance, the second electric capacity (C r2) both end voltage increase, the 3rd electric capacity (C r3) both end voltage reduction;
Stage 6 (t 5-t 6):
T 5moment, the 3rd electric capacity (C r3) voltage is reduced to zero, auxiliary switch (S 3) backward diode conducting, resonance terminates, auxiliary switch (S 3) no-voltage is open-minded;
Stage 7 (t 6-t 7):
T 6moment, the first main switch (S 1) turn off, load current gives the second electric capacity (C r2) electric discharge, to the first electric capacity (C r1) charging;
Stage 8 (t 7-t 8):
T 7moment, the first electric capacity (C r1) voltage increases to V dc; Second electric capacity (C r2) voltage is reduced to zero, load current is through the second main switch (S 2) anti-paralleled diode afterflow, the second main switch (S 2) no-voltage is open-minded, t 8moment t 0moment circuit state is identical, repeats next cycle;
The switching pulse Control timing sequence of inverter when DC bus current is flowed to DC side by AC, in a switch duty cycle, inverter has 9 operating states:
Stage 1 (t 0-t 1):
First main switch (S 1) and auxiliary switch (S 3) be in conducting state, the second main switch (S 2) close, load current is through the second main switch (S 1) anti-paralleled diode afterflow;
Stage 2 (t 1-t 2):
T 1in the moment, turn off auxiliary switch (S 3), resonant inductance (L r) and the 3rd electric capacity (C r3), the second electric capacity (C r2) resonance, the 3rd electric capacity (C r3) both end voltage increase, the second electric capacity (C r2) both end voltage reduction;
Stage 3 (t 2-t 3):
T 2moment, the second electric capacity (C r2) voltage is reduced to zero, the second main switch (S 2) backward diode conducting, resonance terminates;
Stage 4 (t 3-t 4):
T 3moment, the second main switch (S 2) no-voltage is open-minded, the second main switch (S 2) and the first main switch (S 1) the anti-paralleled diode change of current, due to resonant inductance (L r) existence first main switch (S 1) reversely restoring process of anti-paralleled diode is suppressed;
Stage 5 (t 4-t 5):
T 4in the moment, the change of current terminates, the first main switch (S 1) anti-paralleled diode electric current is reduced to zero, now for realizing Sofe Switch, no-voltage opens the first main switch (S 1), bridge arm direct pass, to resonant inductance (L r) magnetize;
Stage 6 (t 5-t 6):
T 5in the moment, turn off the first main switch (S 1), resonant inductance (L r) and the 3rd electric capacity (C r3), the first electric capacity (C r1) resonance, the first electric capacity (C r1) both end voltage increase, the 3rd electric capacity (C r3) both end voltage reduction;
Stage 7 (t 6-t 7):
T 6moment, the 3rd electric capacity (C r3) voltage is reduced to zero, auxiliary switch (S 3) backward diode conducting, resonance terminates, auxiliary switch (S 3) no-voltage is open-minded;
Stage 8 (t 7-t 8):
T 7moment, the second main switch (S 2) turn off, load current gives the first electric capacity (C r1) electric discharge, to the second electric capacity (C r2) charging;
Stage 9 (t 8-t 9):
T 8moment, the second electric capacity (C r2) voltage increases to V dc; First electric capacity (C r1) voltage is reduced to zero, load current is through the first main switch (S 1) anti-paralleled diode afterflow, the first main switch (S 1) no-voltage is open-minded, t 9moment t 0moment circuit state is identical, repeats next cycle.
2. the modulator approach without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter according to claim 1, is characterized in that, described auxiliary switch (S 3) collector electrode is connected with inverter direct-flow side storage battery anode, emitter is connected with single-phase brachium pontis positive bus-bar, clamping capacitance (C c) be connected with single-phase brachium pontis positive bus-bar, resonant inductance (L r) be connected with inverter direct-flow side storage battery anode.
3. the modulator approach without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter according to claim 1, is characterized in that, described auxiliary switch (S 3) emitter is connected with inverter direct-flow side storage battery negative terminal, collector electrode is connected with single-phase brachium pontis negative busbar, clamping capacitance (C c) be connected with single-phase brachium pontis negative busbar, resonant inductance (L r) be connected with inverter direct-flow side storage battery negative terminal.
4. the modulator approach without auxiliary voltage zero voltage switch energy storage semi-bridge type inverter according to claim 1, is characterized in that, described auxiliary switch (S 3) emitter is connected with inverter direct-flow side storage battery negative terminal, collector electrode is connected with single-phase brachium pontis negative busbar, resonant inductance (L r) be connected with single-phase brachium pontis negative busbar, clamping capacitance (C c) be connected with inverter direct-flow side storage battery negative terminal.
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