CN103001515A - Energy-storage half-bridge type inverter of low-additional-voltage zero-voltage switch and modulating method - Google Patents
Energy-storage half-bridge type inverter of low-additional-voltage zero-voltage switch and modulating method Download PDFInfo
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Abstract
The invention provides an energy-storage half-bridge type inverter of a low-additional-voltage zero-voltage switch and a modulating method. The energy-storage half-bridge type inverter comprises a direct-current side storage battery, direct-current side partial-pressure capacitors, an alternating-current side filter inductor and a single-phase bridge arm, wherein the single-phase bridge arm comprises two full-control main switches with anti-parallel diodes. A serially connected branch circuit of an auxiliary switch with an anti-parallel diode and a clamping capacitor is connected among the direct-current side partial pressure capacitors and a direct-current bus of the single-phase bridge arm, a resonance inductor is connectively crossed at two ends of the branch circuit, and two ends of the main switches and the auxiliary switch are connected with the capacitors in parallel. The energy-storage half-bridge type inverter runs with load independently or in a grid connection manner, the main switches adopt a sine wave pulse width modulation method, and modulation signals of the auxiliary switch are synchronous with those of the main switches. The auxiliary switch only acts once in each switch period so that zero-voltage conducting of all the main switches can be realized, reverse restoration current of the anti-parallel diodes of the main switches is suppressed, voltage stress of the switches is equal to the voltage of the direct-current side of the inverter, the loss of the switches is low, circuit efficiency is high, work frequency is improved and power density is improved.
Description
Technical field
The present invention relates to half-bridge inverter, particularly, relate to a kind of circuit topology and modulator approach of low auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter.
Background technology
Having simultaneously the operation of generating electricity by way of merging two or more grid systems and the battery energy storage single phase half bridge inverter of bringing onto load independent operation function, its circuit as shown in Figure 1, it comprises the full control main switch S that anti-paralleled diode is arranged by two
1～S
2The single-phase brachium pontis that consists of is connected on the output inductor L between brachium pontis mid point and load or the AC network.This inverter can be realized independent invert function, also can realize the operation of generating electricity by way of merging two or more grid systems, but circuit working is at the hard switching state, exist the reverse-recovery problems of diode, the devices switch loss is large, has limited the raising of operating frequency, has reduced circuit efficiency and has had larger electromagnetic interference.
Through retrieval, publication number is the Chinese patent application of 101667793A, this invention provides a kind of combining inverter, comprise DC power supply, the memory module that is connected with DC power supply, the inversion module that is connected with memory module, and the output module that is connected with electrical network with inversion module respectively, and the continuous current circuit that is connected with output module with inversion module respectively.In this invention, on the basis of the full-bridge grid-connected inverter of traditional single phase, cooperate simultaneously corresponding modulation system by introducing continuous current circuit, thereby efficiently solve the full-bridge grid-connected inverter of traditional single phase existing problem when adopting the bipolarity modulation and adopting the unipolarity modulation, thereby improved 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 half power frequency period of the first afterflow transistor turns, make simultaneously the cut-off of the first, the 4th inverter transistor and the second afterflow transistor, and make second, third inverter transistor under the synchronous triggering of described high frequency trigger signal, make high frequency to switch synchronously, so that the positive half cycle of the outboard end output AC power source of first, second filter inductance; Then described microcontroller makes half power frequency period of the second afterflow transistor turns, make simultaneously the cut-off of second, third inverter transistor and the first afterflow transistor, the first, the 4th inverter transistor is made high frequency and is switched synchronously under the synchronous triggering of described high frequency trigger signal, so that the negative half period of the outboard end output AC power source of first, second filter inductance, so repeatedly.
Be that the Chinese patent application of 101667793A is compared with publication number, at first: the topology that the present invention proposes is a kind of Zero-voltage switch half-bridge inverter; Secondly, the control strategy main purpose that proposes among the 101667793A is to reduce the electromagnetic compatibility problem of the lower single-phase grid-connected inverter of unipolarity modulation, and the present invention is by increasing an auxiliary tube, the no-voltage that realizes all switches is open-minded, the establishment diode reverse recovery, both inverter efficiency can be improved, also Electro Magnetic Compatibility can be improved.At last, 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 defective of the prior art, the purpose of this invention is to provide a kind of reverse recovery current that can twin zener dioder, reduce switching loss, improve circuit efficiency, reduce electromagnetic interference and realize low auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter and the modulator approach that switch tube zero voltage is opened.
According to an aspect of the present invention, the invention provides a kind of low auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter, comprise the inverter direct-flow side storage battery, DC side dividing potential drop capacitor C
1, C
2, the single-phase brachium pontis by two full control main switches that anti-paralleled diode arranged consist of is connected on the output inductor L between brachium pontis mid point and output loading or the AC network, wherein: two main switch S of single-phase brachium pontis
1, S
2An electric capacity in parallel is the first capacitor C respectively
R1, the second capacitor C
R2, in inverter dc partial voltage capacitor C
1, C
2And have access to the auxiliary switch S of anti-paralleled diode between the dc bus of single-phase brachium pontis
3With clamping capacitance C
cSeries arm, auxiliary switch S
3Two ends the 3rd capacitor C in parallel
R3, auxiliary switch S
3With clamping capacitance C
cThe series arm two ends cross-over connection resonant inductance L that forms
r
According to an aspect of the present invention, the invention provides a kind of circuit modulator approach of low auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter, wherein: main switch adopts the double polarity sine pulse duration modulation method, and auxiliary switch modulation signal and main switch modulation signal are synchronous; Auxiliary switch turn-offed before full control switch from the diode change of current at main switch, created no-voltage for main switch and opened condition; When the inverter dc bus current flowed to DC side by AC, within the blink that auxiliary switch turn-offs, main switch brachium pontis up and down two Switch Cut-through provided the afterflow path to resonant inductance, makes the resonant inductance stored energy be enough to realize inverter soft switching.When grid-connected inverters, the inverter zero voltage switch all can realize in ac-side current total power factor angular region.When inverter bringing onto load independent operating, the inverter zero voltage switch all can realize in load current total power factor angular region, satisfies the requirement of battery energy storage inverter energy in bidirectional flow.
Compared with prior art, the present invention has following beneficial effect:
Low auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter of the present invention is simple in structure, and the reverse recovery of the anti-paralleled diode of full control switch is inhibited in the inverter, has reduced electromagnetic interference.All device for power switching realize that no-voltage is open-minded in the circuit, thereby reduce switching loss, improve circuit efficiency, are conducive to improve operating frequency, and then improve power density.The circuit of this inverter and net state under can realize control to output voltage amplitude, phase place and harmonic wave can be used for parallel network reverse or independent inverter in the various batteries to store energy.In addition, the circuit of this inverter also can be used for independent inverter in the various power supplys.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
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 the unity power factor inversion;
Fig. 7 is the pulse control sequential chart of one embodiment of the invention when the dc bus energy flows to AC by the DC side storage battery;
Fig. 8～Figure 16 is the work equivalent electric circuit of one embodiment of the invention switch periods when the dc bus energy flows to AC by the DC side storage battery;
Figure 17 is the main voltage and current waveform of one embodiment of the invention switch periods when the dc bus energy flows to AC by the DC side storage battery;
Figure 18 is the pulse control sequential chart of one embodiment of the invention when the dc bus energy flows to the DC side storage battery by AC;
Figure 19～Figure 27 is the work equivalent electric circuit of one embodiment of the invention switch periods when the dc bus energy flows to the DC side storage battery by AC;
Figure 28 is the main voltage and current waveform of one embodiment of the invention switch periods when the dc bus energy flows to the DC side storage battery by AC.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit in any form the present invention.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
With reference to Fig. 2, low auxiliary voltage stress zero voltage switch battery energy storage semi-bridge type inverter of the present invention comprises the DC side storage battery, DC side dividing potential drop capacitor C
1~ C
2, by two full control main switch S that anti-paralleled diode is arranged
1～S
2The single-phase brachium pontis that consists of is connected on the output inductor L between brachium pontis mid point and AC network or the AC load, wherein: two main switch S of single-phase brachium pontis
1～S
2Difference shunt capacitance C
R1～C
R2, in inverter dc partial voltage capacitor C
1~ C
2And have access to the auxiliary switch S of anti-paralleled diode between the dc bus of single-phase brachium pontis
3With clamping capacitance C
cSeries arm, auxiliary switch S
3Two ends shunt capacitance C
R3, auxiliary switch S
3With clamping capacitance C
cThe series arm two ends cross-over connection resonant inductance L that forms
r
In the specific embodiment shown in Figure 2, auxiliary switch S
3Collector electrode links to each other with inverter direct-flow side storage battery anode, emitter and clamping capacitance C
cLink to each other, the clamping capacitance Cc other end links to each other resonant inductance L with single-phase brachium pontis positive bus-bar
rOne end links to each other with inverter direct-flow side storage battery anode, and the other end links to each other with single-phase brachium pontis positive bus-bar.
Among another embodiment shown in Figure 3, auxiliary switch S
3Collector electrode and clamping capacitance C
cLink to each other, emitter links to each other with single-phase brachium pontis positive bus-bar, and the clamping capacitance Cc other end links to each other resonant inductance L with inverter direct-flow side storage battery anode
rOne end links to each other with inverter direct-flow side storage battery anode, and the other end links to each other with single-phase brachium pontis positive bus-bar.
Among another embodiment shown in Figure 4, auxiliary switch S
3Collector electrode links to each other with single-phase brachium pontis negative busbar, collector electrode and clamping capacitance C
cLink to each other, the clamping capacitance Cc other end links to each other resonant inductance L with inverter direct-flow side storage battery negative terminal
rOne end links to each other with inverter direct-flow side storage battery negative terminal, and the other end links to each other with single-phase brachium pontis negative busbar.
Among another embodiment shown in Figure 5, auxiliary switch S
3Collector electrode and clamping capacitance C
cLink to each other, emitter links to each other with inverter direct-flow side storage battery negative terminal, and the clamping capacitance Cc other end links to each other resonant inductance L with single-phase brachium pontis negative busbar
rOne end links to each other with inverter direct-flow side storage battery anode, and the other end links to each other with single-phase brachium pontis positive bus-bar.
Adopt the SPWM modulation without auxiliary voltage Zero-voltage switch half-bridge inverter.
SPWM is divided into unipolarity and bipolarity.Bipolarity when modulation, at whole modulating wave in the cycle, the complementary conducting of S1, S2.The present invention adopts the bipolarity modulation.
If Sine Modulated voltage is u
Ref=msin (ω t), when adopting the bipolarity modulation, switch S 1 duty ratio
Switch S 2 duty ratios
For the course of work without auxiliary voltage Zero-voltage switch half-bridge inverter, here just take shown in Figure 2 without auxiliary voltage Zero-voltage switch half-bridge inverter when dc bus current flows to AC by DC side and the switch periods of dc bus current when flowing to DC side by AC analyze respectively as example.
The switching pulse of inverter control sequential as shown in Figure 7 when dc bus current flows to AC by DC side.In cycle, inverter has 9 operating states at a switch.Fig. 8～Figure 16 is the work equivalent electric circuit of the present invention's switch periods when the dc bus energy flows to AC by the DC side storage battery.Main voltage and current waveform during work is shown in figure-17.
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 S
2The anti-paralleled diode afterflow.
Stages 2 (t
1-t
2):
As shown in Figure 9, t
1Constantly turn-off S
3Inductance L
rAnd capacitor C
R3, C
R1Resonance, capacitor C
R3Both end voltage increases, capacitor C
R1Both end voltage reduces.
Stages 3 (t
2-t
3):
As shown in figure 10, t
2Constantly, capacitor C
R1Voltage is reduced to zero, main switch S
1The backward diode conducting, resonance finishes.
Stages 4 (t
3-t
4):
As shown in figure 11, t
3Constantly, S
1No-voltage is open-minded.Main switch S
1With S
2The anti-paralleled diode change of current is because L
rHave a main switch S
2The reversely restoring process of anti-paralleled diode is suppressed.
Stages 5 (t
4-t
5):
As shown in figure 12, t
4Constantly, the change of current finishes, main switch S
2The anti-paralleled diode electric current is reduced to zero.This moment, no-voltage was opened S in order to realize soft switch
2, bridge arm direct pass is to L
rMagnetize.
Stages 6 (t
5-t
6):
As shown in figure 13, t
5Constantly, close main switch S
2Inductance L
rAnd capacitor C
R3, C
R2Resonance, capacitor C
R2Both end voltage increases, capacitor C
R3Both end voltage reduces.
Stages 7 (t
6-t
7):
As shown in figure 14, t
6Constantly, capacitor C
R3Voltage is reduced to zero, main switch S
3The backward diode conducting, resonance finishes.Auxiliary switch S
3No-voltage is open-minded.
Stages 8 (t
7-t
8):
As shown in figure 15, t
7Constantly, main switch S
1Turn-off.Load current is to capacitor C
R2Capacitor C is given in discharge
R1Charging.
Stages 9 (t
8-t
9):
As shown in figure 16, t
9Constantly, capacitor C
R1Voltage increases to V
DcCapacitor C
R2Voltage is reduced to zero, and load current is through main switch S
2The anti-paralleled diode afterflow.Main switch S
2No-voltage is open-minded, and t0 moment circuit state is identical constantly for t9, repeats next cycle.
The switching pulse of inverter control sequential as shown in figure 18 when dc bus current flows to DC side by AC.In cycle, inverter has 9 operating states at a switch.Figure 19～Figure 27 is the work equivalent electric circuit of a switch periods when the dc bus energy flows to the DC side storage battery by AC.Main voltage and current waveform during work as shown in figure 28.
Stage 1 (t
0-t
1):
As shown in figure 19, main switch S
1With auxiliary switch S
3Be in conducting state, main switch S
2Close, load current is through S
1The anti-paralleled diode afterflow.
Stages 2 (t
1-t
2):
As shown in figure 20, t
1Constantly turn-off S
3, since the existence of shunt capacitance, S
3No-voltage is turn-offed.Inductance L
rAnd capacitor C
R3, C
R2Resonance, capacitor C
R3Both end voltage increases, capacitor C
R2Both end voltage reduces.
Stages 3 (t
2-t
3):
As shown in figure 21, t
2Constantly, capacitor C
R2Voltage is reduced to zero, main switch S
2The backward diode conducting, resonance finishes.
Stages 4 (t
3-t
4):
As shown in figure 22, t
3Constantly, main switch S
2No-voltage is open-minded.Main switch S
2With S
1The anti-paralleled diode change of current is because L
rHave a main switch S
1The reversely restoring process of anti-paralleled diode is suppressed.
Stages 5 (t
4-t
5):
As shown in figure 23, t
4Constantly, the change of current finishes, main switch S
1The anti-paralleled diode electric current is reduced to zero.This moment, no-voltage was opened main switch S in order to realize soft switch
1, bridge arm direct pass is to L
rMagnetize.
Stages 6 (t
5-t
6):
As shown in figure 24, t
5Constantly, turn-off main switch S
1Inductance L
rAnd capacitor C
R3, C
R1Resonance, capacitor C
R1Both end voltage increases, capacitor C
R3Both end voltage reduces.
Stages 7 (t
6-t
7):
As shown in figure 25, t
6Constantly, capacitor C
R3Voltage is reduced to zero, auxiliary switch S
3The backward diode conducting, resonance finishes.Auxiliary switch S
3No-voltage is open-minded.
Stages 8 (t
7-t
8):
As shown in figure 26, t
7Constantly, main switch S
2Turn-off.Load current is to capacitor C
R1Capacitor C is given in discharge
R2Charging.
Stages 9 (t
8-t
9):
As shown in figure 27, t
8Constantly, capacitor C
R2Voltage increases to V
DcCapacitor C
R1Voltage is reduced to zero, and load current is through main switch S
1The anti-paralleled diode afterflow.Main switch S
1No-voltage is open-minded, and t0 moment circuit state is identical constantly for t9, repeats next cycle.
More than be a preferred embodiment of the present invention, for the embodiment shown in Fig. 3-5, its implementation and above-mentioned embodiment illustrated in fig. 2 similar no longer describes in detail.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (6)
1. one kind low auxiliary voltage zero voltage switch energy storage semi-bridge type inverter is characterized in that: comprise the inverter direct-flow side storage battery, DC side dividing potential drop electric capacity (C
1, C
2), by two full control main switch (S that anti-paralleled diode is arranged
1, S
2) the single-phase brachium pontis that consists of, be connected on the output inductor (L) between brachium pontis mid point and output loading or the AC network, wherein: two main switch (S of single-phase brachium pontis
1, 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) and clamping capacitance (C
c) series arm, auxiliary switch (S
3) two ends the 3rd electric capacity (C in parallel
R3), auxiliary switch (S
3) and clamping capacitance (C
c) the series arm two ends cross-over connection resonant inductance (L that forms
r).
2. a kind of low 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 links to each other emitter and clamping capacitance (C with inverter direct-flow side storage battery anode
c) link to each other clamping capacitance (C
c) other end links to each other resonant inductance (L with single-phase brachium pontis positive bus-bar
r) end links to each other with inverter direct-flow side storage battery anode, the other end links to each other with single-phase brachium pontis positive bus-bar.
3. a kind of low 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 and clamping capacitance (C
c) link to each other, emitter links to each other clamping capacitance (C with single-phase brachium pontis positive bus-bar
c) other end links to each other resonant inductance (L with inverter direct-flow side storage battery anode
r) end links to each other with inverter direct-flow side storage battery anode, the other end links to each other with single-phase brachium pontis positive bus-bar.
4. a kind of low 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 links to each other collector electrode and clamping capacitance (C with single-phase brachium pontis negative busbar
c) link to each other clamping capacitance (C
c) other end links to each other resonant inductance (L with inverter direct-flow side storage battery negative terminal
r) end links to each other with inverter direct-flow side storage battery negative terminal, the other end links to each other with single-phase brachium pontis negative busbar.
5. a kind of low 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 and clamping capacitance (C
c) link to each other, emitter links to each other clamping capacitance (C with inverter direct-flow side storage battery negative terminal
c) other end links to each other resonant inductance (L with single-phase brachium pontis negative busbar
r) end links to each other with inverter direct-flow side storage battery anode, the other end links to each other with single-phase brachium pontis positive bus-bar.
6. the modulator approach of each described low auxiliary voltage zero voltage switch energy storage semi-bridge type inverter according to claim 1-5 is characterized in that: main switch adopts the double polarity sine pulse duration modulation method, and auxiliary switch modulation signal and main switch modulation signal are synchronous; Auxiliary switch turn-offed before full control switch from the diode change of current at main switch, created no-voltage for main switch and opened condition; When the inverter dc bus current flowed to DC side by AC, within the blink that auxiliary switch turn-offs, main switch brachium pontis up and down two Switch Cut-through provided the afterflow path to resonant inductance, makes the resonant inductance stored energy be enough to realize inverter soft switching; The inverter zero voltage switch all can realize in inverter ac-side current total power factor angular region.
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178739A (en) * | 2013-04-17 | 2013-06-26 | 东南大学 | Zero-voltage transition full-bridge non-isolated photovoltaic grid-connected inverter |
| CN104167913A (en) * | 2014-08-18 | 2014-11-26 | 浙江大学 | Soft switch single-phase inverter starting method |
| CN108667058A (en) * | 2018-07-24 | 2018-10-16 | 合肥工业大学 | A kind of system for chain type energy storage structure that can eliminate secondary pulsation |
| CN108880313A (en) * | 2018-08-24 | 2018-11-23 | 广东工业大学 | A kind of series resonance-type couples three inductance half-bridge converters and system |
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| US4864483A (en) * | 1986-09-25 | 1989-09-05 | Wisconsin Alumni Research Foundation | Static power conversion method and apparatus having essentially zero switching losses and clamped voltage levels |
| CN1635696A (en) * | 2004-12-27 | 2005-07-06 | 浙江大学 | Minimum voltage active clamping three-phase AC-DC power factor correction converter |
| CN101951186A (en) * | 2010-09-27 | 2011-01-19 | 浙江大学 | Soft switching three-phase gird-connected inverter additionally provided with freewheeling path |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4864483A (en) * | 1986-09-25 | 1989-09-05 | Wisconsin Alumni Research Foundation | Static power conversion method and apparatus having essentially zero switching losses and clamped voltage levels |
| CN1635696A (en) * | 2004-12-27 | 2005-07-06 | 浙江大学 | Minimum voltage active clamping three-phase AC-DC power factor correction converter |
| CN101951186A (en) * | 2010-09-27 | 2011-01-19 | 浙江大学 | Soft switching three-phase gird-connected inverter additionally provided with freewheeling path |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178739A (en) * | 2013-04-17 | 2013-06-26 | 东南大学 | Zero-voltage transition full-bridge non-isolated photovoltaic grid-connected inverter |
| CN103178739B (en) * | 2013-04-17 | 2014-12-10 | 东南大学 | Zero-voltage transition full-bridge non-isolated photovoltaic grid-connected inverter |
| CN104167913A (en) * | 2014-08-18 | 2014-11-26 | 浙江大学 | Soft switch single-phase inverter starting method |
| CN104167913B (en) * | 2014-08-18 | 2016-06-29 | 浙江大学 | A kind of Sofe Switch single-phase inverter starting method |
| CN108667058A (en) * | 2018-07-24 | 2018-10-16 | 合肥工业大学 | A kind of system for chain type energy storage structure that can eliminate secondary pulsation |
| CN108880313A (en) * | 2018-08-24 | 2018-11-23 | 广东工业大学 | A kind of series resonance-type couples three inductance half-bridge converters and system |
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