CN103259446A - Inverter power source device - Google Patents
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- CN103259446A CN103259446A CN2012100357058A CN201210035705A CN103259446A CN 103259446 A CN103259446 A CN 103259446A CN 2012100357058 A CN2012100357058 A CN 2012100357058A CN 201210035705 A CN201210035705 A CN 201210035705A CN 103259446 A CN103259446 A CN 103259446A
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Abstract
The invention discloses an inverter power source device used for converting a direct current output by a direct-current power source into an alternating current. The inverter power source device comprises a preceding-stage current feed circuit and a posterior-stage inverter circuit. The current feed circuit comprises a half-bridge converter, an isolation transformer and a rectifying circuit, wherein the half-bridge converter, the isolation transformer and the rectifying circuit are connected in series in sequence. The posterior-stage inverter circuit comprises a tank circuit and a bipolar full-bridge high-frequency inverter circuit, wherein the tank circuit is connected between two output ends of the current feed circuit, and the bipolar full-bridge high-frequency inverter circuit is used for converting direct voltage output by the current feed circuit into alternating voltage. Due to the inverter power source device, under the condition that energy conversion efficiency is ensured, complexity of control can be reduced, and reactive power adjusting and power expansion are convenient.
Description
Technical field
The present invention relates to the voltage transitions technical field, be specifically related to a kind of inverter power supply device.
Background technology
At present, in field of photovoltaic power generation, still generate electricity by way of merging two or more grid systems based on integral type.Grid-connected photovoltaic system by combining inverter with the direct current of solar panel convert to line voltage with frequently, the alternating current of homophase and flow to electrical network, therefore, combining inverter is the nucleus equipment of grid-connected photovoltaic system, its reliability, high efficiency and fail safe meeting have influence on the whole generating system, are directly connected to plant generator amount and stable.
Grid-connected little inverter (being called for short little inverter) links to each other with single photovoltaic module, the direct current of photovoltaic module output can be directly converted to alternating current and be transferred to electrical network, and guarantee that output current and line voltage frequency, phase place are in full accord.In the two-stage type grid-connected photovoltaic system, combining inverter only need carry out inversion control, photovoltaic array MPPT maximum power point tracking (MPPT) is finished by prime DC/DC converter, and combining inverter is realized the system power balance by the output voltage of control DC/DC converter.
In the prior art, little inverter topology major part commutates to realize in conjunction with a back level power frequency with the inverse-excitation type prime, as shown in Figure 1.Wherein, the switching tube Q1 in the prime controls by soft switch, and four switch transistor T 1-T4 power frequencies switchings in the level of back are transferred to electrical network with capacitor C 1 end energy, and Fig. 2 is the voltage waveform at little inverter intermediate capacitance C1 shown in Figure 1 two ends.
As seen from Figure 2, what traditional miniature inverter prime reverse excitation circuit was exported is not constant DC, can't realize idle adjusting.In addition, in little inverter of this structure, transformer T not only will be used for energy storage, but also will be used for the transmission energy, therefore need open air gap, so the prime reverse excitation circuit can't be done power greatly, even power is done greatly, efficient is also very low.And, in order to realize soft switch, not only need to select for use the controller of superior performance, and design and go up more complicated, also need to increase some auxiliary circuits sometimes.
Summary of the invention
The embodiment of the invention provides a kind of inverter power supply device at the problem that above-mentioned prior art exists, and under the situation that guarantees energy conversion efficiency, reduces the complexity of control, makes things convenient for power expanding.
For this reason, the embodiment of the invention provides following technical scheme:
A kind of inverter power supply device is used for converting the direct current of DC power supply output to alternating current, comprises prime current feedback circuit and back level inverter circuit, and described current feedback circuit comprises: Chuan Jie half-bridge converter, isolating transformer and rectification circuit successively; Described back level inverter circuit comprises: accumulator and bipolarity full-bridge high-frequency inverter circuit, described accumulator is connected between two outputs of described current feedback circuit, and described bipolarity full-bridge high-frequency inverter circuit is used for the direct voltage of described current feedback circuit output is converted to alternating voltage.
Preferably, described half-bridge converter comprises: first inductance, second inductance, first switching device and second switch device;
First inductance and first switching device are connected in series, first end of first inductance connects the anode of described DC power supply, second end of first inductance connects the end of the same name on the former limit of first end of first switching device and described isolating transformer, and second end of first switching device connects the negative terminal of described DC power supply;
Second inductance and second switch device are connected in series, first end of second inductance connects the anode of described DC power supply, the different name end on first end of second end connection second switch device of second inductance and the former limit of described isolating transformer, second end of second switch device connects the negative terminal of described DC power supply.
Preferably, described first switching device and second switch device be with different pulse signal trigger actions, and at any time, in described first switching device and the second switch device at least one conducting is arranged.
Preferably, described rectification circuit is full-wave rectifying circuit, comprise: four diodes, wherein the negative electrode of the anode of first diode and the 3rd diode is connected to the end of the same name of the secondary of described isolating transformer together, and the negative electrode of the anode of second diode and the 4th diode is connected to the different name end of the secondary of described isolating transformer together;
The negative electrode of first diode links to each other with the negative electrode of second diode and as first output of described current feedback circuit;
The anode of the 3rd diode links to each other with the anode of the 4th diode and as second output of described current feedback circuit.
Preferably, described bipolarity full-bridge high-frequency inverter circuit comprises: four switching devices, wherein:
First end of the 3rd switching device and first end of the 5th switching device are connected to first output of described current feedback circuit together;
Second end of the 4th switching device and second end of the 6th switching device are connected to second output of described current feedback circuit together;
Second end of the 3rd switching device links to each other with first end of the 4th switching device as an output of described bipolarity full-bridge high-frequency inverter circuit, and second end of the 5th switching device links to each other as another output of described bipolarity full-bridge high-frequency inverter circuit with first end of the 6th switching device.
Preferably, the 3rd switching device and the 6th switching device are with the first synchronous high-frequency pulse signal trigger action, the 4th switching device and the 5th switching device are with the second synchronous high-frequency pulse signal trigger action, and in a work period, the complementary conducting of the 3rd switching device and the 4th switching device, and the adding dead band, the complementary conducting of the 5th switching device and the 6th switching device, and add the dead band.
Preferably, described high-frequency pulse signal is pwm pulse signal.
Preferably, a described back level inverter circuit also comprises:
Filter circuit is connected between two outputs of described bipolarity full-bridge high-frequency inverter circuit, is used for the high fdrequency component of the described bipolarity full-bridge high-frequency of filtering inverter circuit output signal.
Preferably, described filter circuit comprises: the 3rd inductance and the 4th inductance, wherein, first end of the 3rd inductance connects first output of described bipolarity full-bridge high-frequency inverter circuit, first end of the 4th inductance connects second output of described bipolarity full-bridge high-frequency inverter circuit, and second end of the 3rd inductance and second end of the 4th inductance are connected to the two ends of AC load or electrical network.
Preferably, described filter circuit also comprises:
Second electric capacity is connected between second output of second output of described the 3rd inductance and described the 4th inductance.
The inverter power supply device that the embodiment of the invention provides, adopt the two-stage topologies of prime half-bridge feed and back level full-bridge inverting, wherein level full bridge inverter in back adopts high frequency bipolarity PWM modulation, be not only applicable to the application scenario of little inverter, but also be applicable to the occasion of small-power band isolation applications.Prime adopts the current feed mode, for inverse-excitation type prime topological structure in the prior art, is more conducive to power expanding.And, switching device in the prime current feed topological structure does not need to consider the problem that leads directly to, need not dead band control, not only control is simpler, and owing to have the existence of the very high inductance of transient impedance, make switching device can realize the no-voltage turn-on and turn-off, reduced switching loss, improved whole efficiency.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use among the embodiment below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the present invention, for those of ordinary skills, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is little inverter topology schematic diagram in the prior art;
Fig. 2 is the voltage waveform at little inverter intermediate capacitance C1 shown in Figure 1 two ends;
Fig. 3 is the principle schematic of embodiment of the invention inverter power supply device
Fig. 4 is a kind of concrete topological structure schematic diagram of embodiment of the invention inverter power supply device;
Fig. 5 is drive waveforms and inductive current and the transformer original edge voltage current waveform schematic diagram of switching device S1, S2 in the embodiment of the invention;
Fig. 6 be in the embodiment of the invention prime current feedback circuit at the current circuit schematic diagram of driving signal shown in Figure 5 during the following phase I;
Fig. 7 is prime current feedback circuit current circuit schematic diagram during second stage under driving signal shown in Figure 5 in the embodiment of the invention;
Fig. 8 be in the embodiment of the invention prime current feedback circuit at the current circuit schematic diagram of driving signal shown in Figure 5 during the following phase III;
Fig. 9 is prime current feedback circuit current circuit schematic diagram during the quadravalence section under driving signal shown in Figure 5 in the embodiment of the invention;
Figure 10 is the driving signal schematic representation of each switching device in the back level inverter circuit course of work in the embodiment of the invention;
Figure 11 is the current circuit schematic diagram of back level inverter circuit when line voltage positive half period pwm pulse triggering and conducting in the embodiment of the invention;
Figure 12 is the current circuit schematic diagram of back level inverter circuit when line voltage positive half period pwm pulse turn-offs in the embodiment of the invention;
Figure 13 is the current circuit schematic diagram of back level inverter circuit when line voltage negative half-cycle pwm pulse triggering and conducting in the embodiment of the invention;
Figure 14 is the current circuit schematic diagram of back level inverter circuit when line voltage negative half-cycle pwm pulse turn-offs in the embodiment of the invention.
Embodiment
In order to make those skilled in the art person understand the scheme of the embodiment of the invention better, below in conjunction with drawings and embodiments the embodiment of the invention is described in further detail.
As shown in Figure 3, be the principle schematic of embodiment of the invention inverter power supply device.
This inverter power supply device is used for converting the direct current of DC power supply 30 outputs to alternating current, comprises prime current feedback circuit 31 and back level inverter circuit 32.Wherein, described current feedback circuit 31 comprises: Chuan Jie half-bridge converter 311, isolating transformer 312 and rectification circuit 313 successively; Described back level inverter circuit 32 comprises: accumulator 321 and bipolarity full-bridge high-frequency inverter circuit 322.Wherein, accumulator 321 is connected between two outputs of described current feedback circuit 31, and described bipolarity full-bridge high-frequency inverter circuit 322 is used for the direct voltage of described current feedback circuit 31 outputs is converted to alternating voltage.
Need to prove, in inverter power supply device of the present invention, described back level inverter circuit 32 also can further comprise: filter circuit (not shown), be connected between two outputs of described bipolarity full-bridge high-frequency inverter circuit, be used for the high fdrequency component of the described bipolarity full-bridge high-frequency of filtering inverter circuit output signal.Described filter circuit can be topological structures such as L type, LC type, LCL type.
Fig. 4 is a kind of concrete topological structure schematic diagram of embodiment of the invention inverter power supply device.
In this embodiment, the half-bridge converter in the current feedback circuit 31 comprises: first inductance L 1, second inductance L 2, the first switching device S1 and second switch device S2.Wherein:
In this embodiment, the rectification circuit in the current feedback circuit 31 is full-wave rectifying circuit, comprising: four diodes are respectively the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.Wherein:
The negative electrode of the anode of the first diode D1 and the 3rd diode D3 is connected to the end of the same name of the secondary of isolating transformer T together, and the negative electrode of the anode of the second diode D2 and the 4th diode D4 is connected to the different name end of the secondary of isolating transformer T together;
The negative electrode of the first diode D1 links to each other with the negative electrode of the second diode D2, and its tie point is as first output of described current feedback circuit 31;
The anode of the 3rd diode D3 links to each other with the anode of the 4th diode D4, and its tie point is as second output of described current feedback circuit 31.
In this embodiment, the accumulator in the back level inverter circuit 32 is specially first capacitor C 1.Bipolarity full-bridge high-frequency inverter circuit in the level inverter circuit 32 of back comprises: four switching devices as shown in Figure 4, are respectively the 3rd switching device, the 4th switching device, the 5th switching device and the 6th switching device.
As shown in Figure 4, each switching device in the bipolarity full-bridge high-frequency inverter circuit comprises: switching tube and with the antiparallel diode of described switching tube.Described switching tube can be the semiconductor switch pipe, such as MOSFET (high voltage metal oxide silicon field effect transistor), IGBT (igbt), IGCT (integrated gate commutated thyristor), IEGT (strengthening the injection grid transistor) etc.Described diode can be the inverse parallel diode that separate diode or described switching tube inside carry.The drain electrode of described switching tube or collector electrode link to each other with the negative electrode of described diode and constitute first end of described switching device, and the source electrode of described switching tube or emitter link to each other with the anode of described diode and constitute second end of described switching device.Certainly, the embodiment of the invention does not limit the type of above-mentioned switching tube, can also be the switching tube of other type.
As shown in Figure 4, the 3rd switching device is made up of the 3rd switch transistor T 3 and the 3rd diode VD3, the 4th switching device is made up of the 4th switch transistor T 4 and the 4th diode VD4, the 5th switching device is made up of the 5th switch transistor T 5 and the 5th diode VD5, and the 6th switching device is made up of the 6th switch transistor T 6 and the 6th diode VD6.
In this embodiment, first end of first end of the 3rd switching device and the 5th switching device is connected to first output of described current feedback circuit together; Second end of the 4th switching device and second end of the 6th switching device are connected to second output of described current feedback circuit together; Second end of the 3rd switching device links to each other with first end of the 4th switching device as an output of described bipolarity full-bridge high-frequency inverter circuit, and second end of the 5th switching device links to each other as another output of described bipolarity full-bridge high-frequency inverter circuit with first end of the 6th switching device.
In Fig. 4, described filter circuit is specially the two inductive type topological structures of LC, specifically comprises: the 3rd inductance L 3, the 4th inductance L 4 and second capacitor C 2.Wherein, first end of the 3rd inductance L 3 connects first output of described bipolarity full-bridge high-frequency inverter circuit, i.e. first end of second end of the 3rd switching device and the 4th switching device; First end of the 4th inductance connects second output of described bipolarity full-bridge high-frequency inverter circuit, i.e. first end of second end of the 5th switching device and the 6th switching device; Second end of the 3rd inductance L 3 and second end of the 4th inductance L 4 are connected an end of second capacitor C 2 respectively.
Certainly, described filter circuit can also be the L type, the single inductive type of LC, topological structures such as LCL type.
Above-mentioned switching device S1, S2, and switching tube S3 to S6 can be MOSFET, correspondingly, first end of above-mentioned switching device refers to that the D utmost point of MOSFET, second end refer to the S utmost point of MOSFET.
Above-mentioned switching device S1, S2, and switching tube S3 to S6 also can be IGBT, correspondingly, first end of above-mentioned switching device refers to the collector electrode of IGBT, second end refers to the emitter of IGBT.
Above-mentioned DC power supply 30 can be a generator, such as solar generator.
Operation principle below in conjunction with prime current feedback circuit in the embodiment of the invention inverter power supply device of Fig. 4 elaborates.
As shown in Figure 5, be drive waveforms and inductive current and the transformer original edge voltage current waveform schematic diagram of switching device S1, S2.
As seen from Figure 5, the first switching device S1, second switch device S2 are with different pulse signal trigger actions, but at any one constantly, these two switching device S1, S2 always have one to be conducting or all to be conducting, to guarantee the electric current in first inductance L 1 and second inductance L 2 unimpeded loop is arranged.
When the first switching device S1 conducting, when second switch device S2 turn-offs, 1 energy storage of first inductance L, current i 1 linear growth of first inductance L 1 of flowing through.Second inductance L 2 releases energy, current i 2 linear declines of second inductance L 2 of flowing through.The energy that discharges is coupled to the secondary of transformer T by the former limit of transformer T.The secondary of transformer T, the second diode D2 and the 3rd diode D3 constitute the loop, transfer energy to load end.
When second switch device S2 conducting, when the first switching device S1 turn-offs, 2 energy storage of second inductance L, current i 2 linear growths of second inductance L 2 of flowing through.First inductance L 1 releases energy, current i 1 linear decline of first inductance L 1 of flowing through.The energy that discharges is coupled to the secondary of transformer T by the former limit of transformer T.The secondary of transformer T, the first diode D1 and the 4th diode D4 constitute the loop, transfer energy to load end.
When the first switching device S1, second switch device S2 conducting simultaneously, first inductance L 1, second inductance L 2 directly are connected on DC power supply PV two ends, and two inductance all are in the energy storage state, current i 1, i2 linear growth.This moment, the short circuit of transformer T primary side was not transmitted energy to secondary side, and load end only depends on 1 discharge of first capacitor C to keep.
The prime current feedback circuit work period is divided into four-stage in the embodiment of the invention, as shown in Figure 5, from t0, finishes to t4.Respectively this four-stage is elaborated below.
In the following description, represent described DC power supply 30 with PV.
Phase I t0-t1: at t0 constantly, the first switching device S1, second switch device S2 conducting, first inductance L 1, second inductance L 2 directly are connected on DC power supply PV two ends, and first inductance L 1, second inductance L 2 all are in the energy storage state, current i 1, i2 linear growth.At this moment, the short circuit of transformer T primary side is not transmitted energy to secondary side, and load end only depends on 1 discharge of first capacitor C to keep.
At the current circuit of phase I as shown in Figure 6, specific as follows:
Transformer T primary side current loop: PV → L1 → S1 → PV;
PV→L2→S2→PV；
Transformer T secondary side current loop: C1 → load → C1.
Second stage t1-t2: at t1 constantly, second switch device S2 turn-offs, and this moment, the first switching device S1 was in conducting state.First inductance L 1 also is connected on DC power supply PV two ends, is in the energy storage state, current i 1 linear growth.Second inductance L 2 releases energy, current i 2 linear declines.The energy that discharges is coupled to the secondary of transformer T by the former limit of transformer T, and the secondary of transformer T, the second diode D2, first capacitor C 1 and load, the 3rd diode D3 constitute the loop, transfer energy to first capacitor C 1 and the load end.
At the current circuit of second stage as shown in Figure 7, specific as follows:
Transformer T primary side current loop: PV → L1 → S1 → PV;
PV→L2→T→S1→PV；
Transformer T secondary side current loop: T → D2 → C1 and load → D3 → T.
Phase III t2-t3: at t2 constantly, second switch device S2 conducting.This stage first switching device S1 and second switch device S2 all are in conducting state, and first inductance L 1, second inductance L 2 directly are connected on DC power supply PV two ends, and two inductance all are in the energy storage state, current i 1, i2 linear growth.This moment, the short circuit of transformer T primary side was not transmitted energy to secondary side, and load end only depends on 1 discharge of first capacitor C to keep.
At the current circuit of phase III as shown in Figure 8, specific as follows:
Transformer primary side current loop: PV → L1 → S1 → PV;
PV→L2→S2→PV；
Circuit Fault on Secondary Transformer current circuit: C1 → load → C1.
Quadravalence section t3-t4: at t3 constantly, the first switching device S1 turn-offs, and this moment, second switch device S2 was in conducting state; Second inductance L 2 also is connected on DC power supply PV two ends, is in the energy storage state, current i 2 linear growths.First inductance L 1 releases energy, current i 1 linear decline.The energy that discharges is coupled to the secondary of transformer T by the former limit of transformer T, and the secondary of transformer T, the first diode D1, first capacitor C 1 and load, the 4th diode D4 constitute the loop, transfer energy to first capacitor C 1 and the load end.
At the current circuit of quadravalence section as shown in Figure 9, specific as follows:
Transformer primary side current loop: PV → L2 → S2 → PV;
PV→L1→T→S2→PV；
Circuit Fault on Secondary Transformer current circuit: T → D1 → C1 and load → D4 → T.
Above-mentioned t0-t4 is a complete cycle, the four-stage before circuit state afterwards repeats.
Continue below to elaborate in conjunction with the operation principle of level inverter circuit in back in the embodiment of the invention inverter power supply device of Fig. 4.
In embodiments of the present invention, four switching devices in the described bipolarity full-bridge high-frequency inverter circuit adopt the bipolarity pwm signal to drive, and a kind of drive signal waveform of each switching device as shown in figure 10.Wherein, S3, S4, S5 and S6 represent the driving signal of the 3rd switching device, the 4th switching device, the 5th switching device and the 6th switching device, V respectively
ACThe output signal of representing described back level inverter circuit.
As seen from Figure 10, the 3rd switching device and the 6th switching device are with the first synchronous high-frequency pulse signal trigger action, the 4th switching device and the 5th switching device are with the second synchronous high-frequency pulse signal trigger action, and in a work period, the complementary conducting of the 3rd switching device and the 4th switching device, and the adding dead band, the complementary conducting of the 5th switching device and the 6th switching device, and add the dead band.
The course of work of back level inverter circuit can be divided into four kinds of operating states, is respectively:
The driving signal of (1) the 3rd switch transistor T 3, the 6th switch transistor T 6 keeps high level, is in conducting state, and the driving signal of the 4th switch transistor T 4, the 5th switch transistor T 5 keeps low level, is in off state.
Under this state, current circuit is: Vdc+ → S3 → L3 → AC → L4 → S6 → Vdc-, as shown in figure 11.
(2) the driving signal of 1: the three switch transistor T 3～the 6th switch transistor T 6 of dead band operating state all keeps low level, is in off state.
Under this state, because the electric current in the 3rd inductance L 3 and the 4th inductance L 4 can not suddenly change, diode VD4, VD5 conducting form continuous current circuit: L3 → AC → L4 → VD5 → C1 → VD4 → L3, as shown in figure 12.
The driving signal of (3) the 4th switch transistor T 4, the 5th switch transistor T 5 keeps high level, is in conducting state, and the driving signal of the 3rd switch transistor T 3, the 6th switch transistor T 6 keeps low level, is in off state.
Under this state, current circuit is: Vdc+ → S5 → L4 → AC → L3 → S4 → Vdc-, as shown in figure 13.
(4) the driving signal of 2: the three switch transistor T 3～the 6th switch transistor T 6 of dead band operating state all keeps low level, is in off state.
Under this state, because the electric current in the 3rd inductance L 3 and the 4th inductance L 4 can not suddenly change, diode VD3, VD6 conducting form continuous current circuit: L3 → VD3 → C1 → VD6 → L4 → AC → L3, as shown in figure 14.
Above-mentioned high-frequency pulse signal can be pwm pulse signal.
Need to prove, prime current feed road in the embodiment of the invention and back level inverter circuit can work alone, in other words, the driving of the switching device in the driving of prime switching device S1 and switching device S2 and the back level inverter circuit can independently be controlled, and is independent of each other.
By the above-mentioned course of work as can be seen, the inverter power supply device that the embodiment of the invention provides, adopt the two-stage topologies of prime half-bridge feed and back level full-bridge inverting, wherein level full bridge inverter in back adopts high frequency bipolarity PWM modulation, be not only applicable to the application scenario of little inverter, but also be applicable to the occasion of small-power band isolation applications.Prime adopts the current feed mode, for inverse-excitation type prime topological structure in the prior art, is more conducive to power expanding.And, switching device in the prime current feed topological structure does not need to consider the problem that leads directly to, need not dead band control, not only control is simpler, and owing to have the existence of the very high inductance of transient impedance, make switching device can realize the no-voltage turn-on and turn-off, reduced switching loss, improved whole efficiency.In addition, by the electrical isolation of prime isolating transformer, solved the problem of leakage current well, need not to increase the leakage current absorption plant, be more conducive to raise the efficiency.
In addition, because prime current feedback circuit output constant DC, thereby can make back level inverter circuit carry out high-frequency inversion, realize idle adjusting.
More than the embodiment of the invention is described in detail, used embodiment herein the present invention set forth, the explanation of above embodiment just is used for helping to understand equipment of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. inverter power supply device, be used for converting the direct current of DC power supply output to alternating current, it is characterized in that comprise prime current feedback circuit and back level inverter circuit, described current feedback circuit comprises: Chuan Jie half-bridge converter, isolating transformer and rectification circuit successively; Described back level inverter circuit comprises: accumulator and bipolarity full-bridge high-frequency inverter circuit, described accumulator is connected between two outputs of described current feedback circuit, and described bipolarity full-bridge high-frequency inverter circuit is used for the direct voltage of described current feedback circuit output is converted to alternating voltage.
2. inverter power supply device according to claim 1 is characterized in that, described half-bridge converter comprises: first inductance, second inductance, first switching device and second switch device;
First inductance and first switching device are connected in series, first end of first inductance connects the anode of described DC power supply, second end of first inductance connects the end of the same name on the former limit of first end of first switching device and described isolating transformer, and second end of first switching device connects the negative terminal of described DC power supply;
Second inductance and second switch device are connected in series, first end of second inductance connects the anode of described DC power supply, the different name end on first end of second end connection second switch device of second inductance and the former limit of described isolating transformer, second end of second switch device connects the negative terminal of described DC power supply.
3. inverter power supply device according to claim 2, it is characterized in that, described first switching device and second switch device be with different pulse signal trigger actions, and at any time, in described first switching device and the second switch device at least one conducting is arranged.
4. inverter power supply device according to claim 1, it is characterized in that, described rectification circuit is full-wave rectifying circuit, comprise: four diodes, wherein the negative electrode of the anode of first diode and the 3rd diode is connected to the end of the same name of the secondary of described isolating transformer together, and the negative electrode of the anode of second diode and the 4th diode is connected to the different name end of the secondary of described isolating transformer together;
The negative electrode of first diode links to each other with the negative electrode of second diode and as first output of described current feedback circuit;
The anode of the 3rd diode links to each other with the anode of the 4th diode and as second output of described current feedback circuit.
5. inverter power supply device according to claim 4 is characterized in that, described bipolarity full-bridge high-frequency inverter circuit comprises: four switching devices, wherein:
First end of the 3rd switching device and first end of the 5th switching device are connected to first output of described current feedback circuit together;
Second end of the 4th switching device and second end of the 6th switching device are connected to second output of described current feedback circuit together;
Second end of the 3rd switching device links to each other with first end of the 4th switching device as an output of described bipolarity full-bridge high-frequency inverter circuit, and second end of the 5th switching device links to each other as another output of described bipolarity full-bridge high-frequency inverter circuit with first end of the 6th switching device.
6. inverter power supply device according to claim 5, it is characterized in that, the 3rd switching device and the 6th switching device are with the first synchronous high-frequency pulse signal trigger action, the 4th switching device and the 5th switching device are with the second synchronous high-frequency pulse signal trigger action, and in a work period, the complementary conducting of the 3rd switching device and the 4th switching device, and add the dead band, the complementary conducting of the 5th switching device and the 6th switching device, and add the dead band.
7. inverter power supply device according to claim 6 is characterized in that, described high-frequency pulse signal is pwm pulse signal.
8. according to each described inverter power supply device of claim 1 to 7, it is characterized in that described back level inverter circuit also comprises:
Filter circuit is connected between two outputs of described bipolarity full-bridge high-frequency inverter circuit, is used for the high fdrequency component of the described bipolarity full-bridge high-frequency of filtering inverter circuit output signal.
9. inverter power supply device according to claim 8, it is characterized in that, described filter circuit comprises: the 3rd inductance and the 4th inductance, wherein, first end of the 3rd inductance connects first output of described bipolarity full-bridge high-frequency inverter circuit, first end of the 4th inductance connects second output of described bipolarity full-bridge high-frequency inverter circuit, and second end of the 3rd inductance and second end of the 4th inductance are connected to the two ends of AC load or electrical network.
10. inverter power supply device according to claim 9 is characterized in that, described filter circuit also comprises:
Second electric capacity is connected between second output of second output of described the 3rd inductance and described the 4th inductance.
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| CN2012100357058A CN103259446A (en) | 2012-02-16 | 2012-02-16 | Inverter power source device |
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| CN2012100357058A CN103259446A (en) | 2012-02-16 | 2012-02-16 | Inverter power source device |
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| CN (1) | CN103259446A (en) |
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