CN103259439A - Inverter power supply device - Google Patents
Inverter power supply device Download PDFInfo
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- CN103259439A CN103259439A CN2012100355921A CN201210035592A CN103259439A CN 103259439 A CN103259439 A CN 103259439A CN 2012100355921 A CN2012100355921 A CN 2012100355921A CN 201210035592 A CN201210035592 A CN 201210035592A CN 103259439 A CN103259439 A CN 103259439A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses an inverter power supply device which is used for converting a direct current output by a direct current power source into alternative current. The inverter power supply device comprises a front level current feed circuit and a rear level inverter circuit. The front level current feed circuit comprises a full-bridge converter, an isolation transformer and a rectifying circuit, wherein the full-bridge converter, the isolation transformer and the rectifying circuit are sequentially connected in series. The rear level inverter circuit is a single buck inverter circuit. According to the inverter power supply device, under the condition that energy conversion efficiency is ensured, complexity of control can be reduced, and convenience is brought to reactive power regulation and power dilatation.
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 full-bridge converter, isolating transformer and rectification circuit successively; Described back level inverter circuit is single BUCK inverter circuit.
Preferably, described full-bridge converter comprises: first inductance, first switching device, second switch device, the 3rd switching device and the 4th switching device;
First end of first inductance connects the anode of described DC power supply, second end of first inductance connects first end of first switching device and first end of the 3rd switching device, and second end of second switch device is connected the negative terminal of described DC power supply with second end of the 4th switching device;
Second end of first switching device is connected to the end of the same name on the former limit of described isolating transformer with first end of second switch device, and second end of the 3rd switching device is connected to the different name end on the former limit of described isolating transformer with first end of the 4th switching device.
Preferably, described first switching device and the 4th switching device are with the first pulse signal trigger action, second switch device and the 3rd switching device are with the second pulse signal trigger action, described first pulse signal is different with described second pulse, 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 single BUCK inverter circuit comprises: Chuan Jie accumulator, BUCK circuit and full bridge inverter successively;
Described accumulator is connected between two outputs of described current feedback circuit, is used for the high fdrequency component of the described current feedback circuit output voltage of filtering;
Described BUCK circuit is used for the direct voltage of described current feedback circuit output is converted to lower direct voltage and output;
Described full bridge inverter is used for the direct voltage of described BUCK circuit output is converted to alternating voltage.
Preferably, described BUCK circuit comprises: the 9th switching device, the 5th diode and second inductance, wherein, first end of the 9th switching device connects first output of described current feedback circuit, and second end of the 9th switching device connects the negative electrode of the 5th diode and first end of second inductance; The anode of the 5th diode connects second output of described current feedback circuit; Second output of second inductance is connected to described full bridge inverter as the output of described BUCK circuit.
Preferably, described full bridge inverter comprises: four switching devices, wherein:
First end of the 5th switching device and first end of the 6th switching device are connected to the output of described BUCK circuit together;
Second end of minion pass device and second end of the 8th switch device are connected to the anode of described the 5th diode together;
Second end of the 5th switching device links to each other as an output of described inverter power supply device with first end that minion is closed device, and second end of the 6th switching device links to each other as another output of described inverter power supply device with first end of the 8th switch device.
Preferably, the preceding half period in a work period, the 9th switching device is with the high-frequency pulse signal trigger action, the 5th switching device and the 8th switch break-over of device, and the 6th switching device and minion are closed device and are turn-offed; In the later half cycle in a work period, the 9th switching device is with described high-frequency pulse signal trigger action, and the 5th switching device and the 8th switch device turn-off, and the 6th switching device and minion are closed break-over of device.
Preferably, described high-frequency pulse signal is pwm pulse signal.
Preferably, described single BUCK inverter circuit also comprises:
Filter circuit is connected between the anode of the output of described BUCK circuit and described the 5th diode, is used for the high fdrequency component of the direct voltage of the described BUCK circuit output of filtering.
The inverter power supply device that the embodiment of the invention provides adopts prime full-bridge feed and the back single Buck of level to add the two-stage topologies of full-bridge inverting, is not only applicable to the application scenario of little inverter, but also is 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 to S4 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 full-bridge converter 311, isolating transformer 312 and rectification circuit 313 successively; Described back level inverter circuit 32 is specially single BUCK inverter circuit.
Fig. 4 is a kind of concrete topological structure schematic diagram of embodiment of the invention inverter power supply device.
In this embodiment, the full-bridge converter in the current feedback circuit 31 comprises: first inductance L 1, the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4.Wherein:
First end of first inductance L 1 connects the anode of described DC power supply 30, second end of first inductance L 1 connects first end of the first switching device S1 and first end of the 3rd switching device S3, and second end of second switch device S2 is connected the negative terminal of described DC power supply 30 with second end of the 4th switching device S4.
Second end of the first switching device S1 is connected to the end of the same name on the former limit of isolating transformer T with first end of second switch device S2, and second end of the 3rd switching device S3 is connected to the different name end on the former limit of isolating transformer T with first end of the 4th switching device S4.
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, a level inverter circuit 32 in back is that described single BUCK inverter circuit comprises: Chuan Jie accumulator, BUCK circuit and full bridge inverter successively.Wherein:
Described accumulator is connected between two outputs of described current feedback circuit 31, is used for the high fdrequency component of described current feedback circuit 31 output voltages of filtering.As shown in Figure 4, described accumulator is specially first capacitor C 1.
Described BUCK circuit is used for the direct voltage of described current feedback circuit 31 outputs is converted to lower direct voltage and output.As shown in Figure 4, this BUCK circuit comprises: the 9th switching device S9, the 5th diode D5 and second inductance L 2, wherein, first end of the 9th switching device S9 connects first output of described current feedback circuit, and second end of the 9th switching device S9 connects the negative electrode of the 5th diode D5 and first end of second inductance L 2; The anode of the 5th diode D5 connects second output of described current feedback circuit; Second output of second inductance L 2 is connected to described full bridge inverter as the output of described BUCK circuit.
Described full bridge inverter is used for the direct voltage of described BUCK circuit output is converted to alternating voltage.As shown in Figure 4, this full bridge inverter comprises: four switching devices are respectively that the 5th switching device S5, the 6th switching device S6, minion are closed device S7 and the 8th switch device S8.Wherein:
First end of first end of the 5th switching device S5 and the 6th switching device S6 is connected to the output of described BUCK circuit together;
Second end of minion pass device S7 and second end of the 8th switch device S8 are connected to the anode of described the 5th diode D5 together;
Second end of the 5th switching device S5 links to each other as an output of described inverter power supply device with first end that minion is closed device S7, and second end of the 6th switching device links to each other as another output of described inverter power supply device with first end of the 8th switch device.
Need to prove, in inverter power supply device of the present invention, described back level inverter circuit 32 also can further comprise: filter circuit, be connected between the anode of the output of described BUCK circuit and described the 5th diode D5, be used for the high fdrequency component of the direct voltage of the described BUCK circuit output of filtering.In Fig. 4, described filter circuit is specially second capacitor C 2.This filter capacitor C2 can choose the less electric capacity of appearance value, thin-film capacitor for example, and the life-span is long, has increased reliability and the life-span of inverter.
Certainly, described filter circuit can also be topological structures such as L type, LC type, LCL type.
The above-mentioned first switching device S1 to the, nine switching device S9 can be MOSFET, and 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.
The above-mentioned first switching device S1 to the, nine switching device S9 also can be IGBT, and correspondingly, first end of above-mentioned switching device refers to the collector electrode of IGBT, and 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～S4.
As seen from Figure 5, the first switching device S1 and the 4th switching device S4 are with the first pulse signal trigger action, second switch device S2 and the 3rd switching device S3 are with the second pulse signal trigger action, described first pulse signal is different with described second pulse, and at any time, always to have one among the first switching device S1 and the second switch device S2 be conducting or all be conducting, to guarantee the electric current in first inductance L 1 unimpeded loop arranged.
When the first switching device S1, the 4th switching device S4 conducting, second switch device S2, the 3rd switching device S3 shutoff, the current i 1 of first inductance L 1 of flowing through through the former limit of transformer T, the first switching device S1, the 4th switching device S4 constitute the loop, the secondary of the first diode D1, the 4th diode D4 and transformer constitutes the loop simultaneously, is delivered to load end.
When second switch device S2, the 3rd switching device S3 conducting, when the first switching device S1, the 4th switching device S4 turn-off, the current i 1 of first inductance L 1 of flowing through through the former limit of transformer T, second switch device S2, the 3rd switching device S3 constitute the loop, the secondary of the second diode D2, the 3rd diode D3 and transformer constitutes the loop simultaneously, is delivered to load end.
When the first switching device S1, the 4th switching device S4, second switch device S2, the 3rd switching device S3 conducting simultaneously, first inductance L 1 directly is connected on DC power supply 30 two ends, and first inductance L 1 is in the energy storage state, current i 1 linear growth.This moment, transformer T former limit short circuit was not transmitted energy to secondary, and load end only depends on storage capacitor C1 discharge to keep.
In the embodiment of the invention, a work period of prime current feedback circuit is divided into four-stage, 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, second switch device S2, the 3rd switching device S3 turn-off.This stage first switching device S1 and the 4th switching device S4 are in conducting state, and second switch device S2 and the 3rd switching device S3 are in off state.Transformer T secondary side, the first diode D1, the 4th diode D4 conducting, the second diode D2, the 3rd diode D3 oppositely end.Energy is delivered to load by transformer T, and gives first capacitor C 1 charging.
At the current circuit of phase I as shown in Figure 6, specific as follows:
Transformer primary side current loop: PV → L1 → S1 → T → S4 → PV;
Circuit Fault on Secondary Transformer current circuit: T → D1 → C1 and load → D4 → T.
Second stage t1-t2: at t1 constantly, second switch device S2, the 3rd switching device S3 are open-minded, and at this moment, the first switching device S1, second switch device S2, the 3rd switching device S3, the 4th switching device S4 are in conducting state; First inductance L 1 directly is connected on DC power supply PV two ends, current i 1 linear growth of first inductance L 1 of flowing through, and winding of transformer T is by second switch device S2, the 4th switching device S4 short circuit, and noenergy is to the secondary side transmission.The first diode D1, the 4th diode D4, the second diode D2, the 3rd diode D3 all oppositely end, and load-side is kept by 1 discharge of first capacitor C.
At the current circuit of second stage as shown in Figure 7, specific as follows:
Transformer primary side current loop: PV → L1 → S1 and S3 → S2 and S4 → PV;
Circuit Fault on Secondary Transformer current circuit: C1 → load → C1.
Phase III t2-t3: at t2 constantly, the first switching device S1, the 4th switching device S4 turn-off.This stage second switch device S2 and the 3rd switching device S3 are in conducting state, and the first switching device S1 and the 4th switching device S4 are in off state.Transformer T secondary side, the second diode D2, the 3rd diode D3 conducting, the first diode D1, the 4th diode D4 oppositely end.Energy is delivered to load by transformer T, and gives first capacitor C 1 charging.
At the current circuit of phase III as shown in Figure 8, specific as follows:
Transformer primary side current loop: PV → L1 → S3 → T → S2 → PV;
Circuit Fault on Secondary Transformer current circuit: T → D2 → C1 and load → D3 → T.
Quadravalence section t3-t4: at t3 constantly, the first switching device S1, the 4th switching device S4 conducting, at this moment, the first switching device S1, second switch device S2, the 3rd switching device S3, the 4th switching device S4 are in conducting state; First inductance L 1 directly is connected on DC power supply PV two ends, current i 1 linear growth of first inductance L 1 of flowing through, and winding of transformer T is by second switch device S2, the 4th switching device S4 short circuit, and noenergy is to the secondary side transmission.The first diode D1, the 4th diode D4, the second diode D2, the 3rd diode D3 all oppositely end, and load-side is kept by 1 discharge of first capacitor C.
At the current circuit of quadravalence section as shown in Figure 9, specific as follows:
Transformer primary side current loop: PV → L1 → S1 and S3 → S2 and S4 → PV;
Circuit Fault on Secondary Transformer current circuit: C1 → load → C1.
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.
A work period of back level inverter circuit was made up of preceding half period and later half cycle, the corresponding course of work of inverter circuit in a work period is divided into two stages, is respectively the working stage that line voltage is the working stage of timing and line voltage when negative.
In the work period, a kind of drive signal waveform of each switching device as shown in figure 10 in the level inverter circuit of back.
Wherein, the 9th switching device S9 is with the conducting of high-frequency PWM signal triggering or shutoff, and the 5th switching device S5～the 8th switch device S8 commutates to inverter with power frequency conducting or shutoff.
(T represents a switch periods at phase I 0～T/2, it is the mains voltage signal cycle), be the working stage of timing corresponding to line voltage, the 9th switching device S9 is with the high-frequency pulse signal trigger action, the 5th switching device S5 and the 8th switch device S8 conducting, the 6th switching device S6 and minion are closed device S7 and are turn-offed.
In this stage, when the 9th switching device S9 conducting, the 5th diode D5 bears reverse voltage, is in blocking state, and current circuit is: Vdc+ → S9 → L2 → S5 → AC → S8 → Vdc-, as shown in figure 11.
In this stage, when the 9th switching device S9 turn-offed, the electric current in second inductance L 2 can not suddenly change, and the 5th diode D5 conducting forms continuous current circuit: L2 → S5 → AC → S8 → D5 → L2, as shown in figure 12.
At second stage T/2～T, working stage when being negative corresponding to line voltage, the 9th switching device S9 is with described high-frequency pulse signal trigger action, and the 5th switching device S5 and the 8th switch device S8 turn-off, and the 6th switching device S6 and minion are closed device S7 conducting.
In this stage, when the 9th switching device S9 conducting, the 5th diode D5 bears reverse voltage, is in blocking state, and current circuit is: Vdc+ → S9 → L2 → S6 → AC → S7 → Vdc-, as shown in figure 13.
In this stage, when the 9th switching device S9 turn-offed, the electric current in second inductance L 2 can not suddenly change, and the 5th diode D5 conducting forms continuous current circuit: L2 → S6 → AC → S7 → D5 → L2, as shown in figure 14.
Above-mentioned high-frequency pulse signal can be pwm pulse signal.
Need to prove that the prime current feed road in the embodiment of the invention and back level inverter circuit can work alone, in other words, the driving of prime switching device S1～S4 can independently be controlled with the driving of back level switching device S5～S9, 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 prime full-bridge feed and the back single BUCK of level to add the two-stage topologies of full-bridge inverting, 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.
Switching tube in the level inverter circuit of back is different from common full-bridge circuit and uses the PWM modulation, wherein two couples of switching tube S5, S8 realize the power frequency commutation mutually with S6, S7, the control of output realizes by the pulsewidth of the switching tube S9 of adjusting BUCK circuit, reduce back level system switch number of times, improved entire system efficient.
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 full-bridge converter, isolating transformer and rectification circuit successively; Described back level inverter circuit is single BUCK inverter circuit.
2. inverter power supply device according to claim 1 is characterized in that, described full-bridge converter comprises: first inductance, first switching device, second switch device, the 3rd switching device and the 4th switching device;
First end of first inductance connects the anode of described DC power supply, second end of first inductance connects first end of first switching device and first end of the 3rd switching device, and second end of second switch device is connected the negative terminal of described DC power supply with second end of the 4th switching device;
Second end of first switching device is connected to the end of the same name on the former limit of described isolating transformer with first end of second switch device, and second end of the 3rd switching device is connected to the different name end on the former limit of described isolating transformer with first end of the 4th switching device.
3. inverter power supply device according to claim 2, it is characterized in that, described first switching device and the 4th switching device are with the first pulse signal trigger action, second switch device and the 3rd switching device are with the second pulse signal trigger action, described first pulse signal is different with described second pulse, 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 single BUCK inverter circuit comprises: Chuan Jie accumulator, BUCK circuit and full bridge inverter successively;
Described accumulator is connected between two outputs of described current feedback circuit, is used for the high fdrequency component of the described current feedback circuit output voltage of filtering;
Described BUCK circuit is used for the direct voltage of described current feedback circuit output is converted to lower direct voltage and output;
Described full bridge inverter is used for the direct voltage of described BUCK circuit output is converted to alternating voltage.
6. inverter power supply device according to claim 5, it is characterized in that, described BUCK circuit comprises: the 9th switching device, the 5th diode and second inductance, wherein, first end of the 9th switching device connects first output of described current feedback circuit, and second end of the 9th switching device connects the negative electrode of the 5th diode and first end of second inductance; The anode of the 5th diode connects second output of described current feedback circuit; Second output of second inductance is connected to described full bridge inverter as the output of described BUCK circuit.
7. inverter power supply device according to claim 6 is characterized in that, described full bridge inverter comprises: four switching devices, wherein:
First end of the 5th switching device and first end of the 6th switching device are connected to the output of described BUCK circuit together;
Second end of minion pass device and second end of the 8th switch device are connected to the anode of described the 5th diode together;
Second end of the 5th switching device links to each other as an output of described inverter power supply device with first end that minion is closed device, and second end of the 6th switching device links to each other as another output of described inverter power supply device with first end of the 8th switch device.
8. inverter power supply device according to claim 7, it is characterized in that the preceding half period in a work period, the 9th switching device is with the high-frequency pulse signal trigger action, the 5th switching device and the 8th switch break-over of device, the 6th switching device and minion are closed device and are turn-offed; In the later half cycle in a work period, the 9th switching device is with described high-frequency pulse signal trigger action, and the 5th switching device and the 8th switch device turn-off, and the 6th switching device and minion are closed break-over of device.
9. inverter power supply device according to claim 8 is characterized in that, described high-frequency pulse signal is pwm pulse signal.
10. according to each described inverter power supply device of claim 6 to 9, it is characterized in that described single BUCK inverter circuit also comprises:
Filter circuit is connected between the anode of the output of described BUCK circuit and described the 5th diode, is used for the high fdrequency component of the direct voltage of the described BUCK circuit output of filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100355921A CN103259439A (en) | 2012-02-16 | 2012-02-16 | Inverter power supply device |
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| US20050275386A1 (en) * | 2002-06-23 | 2005-12-15 | Powerlynx A/S | Power converter |
| US20100008107A1 (en) * | 2008-07-09 | 2010-01-14 | Sma Solar Technology Ag | Dc/dc converter |
| CN201608660U (en) * | 2010-02-26 | 2010-10-13 | 韩新建 | High-frequency isolation grid-connected inverter |
| EP2400645A2 (en) * | 2010-06-24 | 2011-12-28 | KACO new energy GmbH | Indirect d.c. converter |
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| US20050275386A1 (en) * | 2002-06-23 | 2005-12-15 | Powerlynx A/S | Power converter |
| US20100008107A1 (en) * | 2008-07-09 | 2010-01-14 | Sma Solar Technology Ag | Dc/dc converter |
| CN201608660U (en) * | 2010-02-26 | 2010-10-13 | 韩新建 | High-frequency isolation grid-connected inverter |
| EP2400645A2 (en) * | 2010-06-24 | 2011-12-28 | KACO new energy GmbH | Indirect d.c. converter |
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| A.ITOHER ET AL: "A new panel-integratable inverter concept for grid-connected photovoltaic systems", 《PROCEEDINGS OF THE IEEE INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS ,1996.ISIE"96.》 * |
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