CN103138610A - Direct current isolated grid-connected inverter circuit and photovoltaic inverter system - Google Patents
Direct current isolated grid-connected inverter circuit and photovoltaic inverter system Download PDFInfo
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- CN103138610A CN103138610A CN2011103781038A CN201110378103A CN103138610A CN 103138610 A CN103138610 A CN 103138610A CN 2011103781038 A CN2011103781038 A CN 2011103781038A CN 201110378103 A CN201110378103 A CN 201110378103A CN 103138610 A CN103138610 A CN 103138610A
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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 is applicable to the technical field of grid-connected photovoltaic power generation, and provides a direct current isolated grid-connected inverter circuit and a photovoltaic inverter system. The direct current isolated grid-connected inverter circuit comprises a direct current-direct current (DC-DC) conversion module, a DC-DC isolation module and a direct current-alternating current (DC-AC) inverter output module which are connected in sequence. In the embodiment of the invention, a received direct current voltage is boosted by the DC-DC conversion module in the direct current isolated grid-connected inverter circuit, so that the input range of the direct current isolated grid-connected inverter circuit is wide; and simultaneously, a direct current bus voltage is outputted after being subjected to isolating, rectifying and filtering processing by the DC-DC isolation module, and an alternating current grid-connected current can be output after the direct current bus voltage is converted into the alternating current grid-connected current by the DC-AC inverter output module, so that the conversion efficiency of a whole machine is improved.
Description
Technical field
The invention belongs to the parallel network power generation technical field, relate in particular to a kind of grid-connected inverter circuit and photovoltaic inverting system of DC-isolation.
Background technology
existing isolated grid-connected inverter adopts single-stage DC-DC (Direct Current-Direct Current, DC-DC) circuit topology is realized voltage transformation and isolation, adopt PWM (Pulse Width Modulation in control, pulse-width modulation) modulate, in order to realize the direct current input of wide region, must use no-load voltage ratio greater than 1 step-up transformer, and the secondary of step-up transformer needs a DC filtering inductance to carry out filtering to the secondary pulse voltage just can obtain DC bus-bar voltage, this traditional combining inverter can cause the voltage stress of rectifier diode of secondary of transformer far away higher than DC bus-bar voltage, while is due to the existence of filter inductance, the ripple current that flows through this inductance is larger, cause the inductance volume large, the complete machine conversion efficiency reduces.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of grid-connected inverter circuit of DC-isolation, is intended to solve the problem that existing inverter input range is narrow, the complete machine conversion efficiency is low.
The embodiment of the present invention is achieved in that a kind of grid-connected inverter circuit of DC-isolation, comprising: the DC-DC modular converter, boost the direct voltage that receives or the rear output of step-down processing; The DC-DC isolation module, its input is connected to the output of described DC-DC modular converter, with the output of described DC-DC modular converter isolate, rectification and filtering process after the output DC bus-bar voltage; And DC-AC inversion output module, its input is connected to the output of described DC-DC isolation module, described DC bus-bar voltage is converted to export after exchanging grid-connected current.
Further, described DC-DC modular converter comprises: inductance, the first one-way conduction element, the first switching tube and the first filter element; One end of described the first one-way conduction element is connected with described direct voltage by described inductance, and the other end of described the first one-way conduction element is as the output of described DC-DC modular converter; The first end of described the first switching tube is connected to an end of described the first one-way conduction element, the second end ground connection of described the first switching tube, the control end of described the first switching tube is connected with outside control signal, and the control end of described the first switching tube is according to conducting or cut-off between the second end of the first end of described first switching tube of control signal control of described outside and described the first switching tube; One end of described the first filter element is connected to the other end of described the first one-way conduction element, the other end ground connection of described the first filter element.
Further, described the first switching tube is field effect transistor, triode or controllable silicon.
Further, described DC-DC isolation module comprises: transformer, the power stage circuit on former limit that is connected to described transformer and the rectification unit that is connected to the secondary of described transformer.
Further, described power stage circuit comprises: second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube; The first end of described second switch pipe is connected to the output of described DC-DC modular converter; The first end of described the 4th switching tube is connected to the second end of described second switch pipe; The second end ground connection of described the 4th switching tube; The first end of described the 3rd switching tube is connected to the first end of described second switch pipe; The first end of described the 5th switching tube is connected to the second end of described the 3rd switching tube; The second end ground connection of described the 5th switching tube; The control end of the control end of the control end of described second switch pipe, described the 3rd switching tube, described the 4th switching tube be connected the control end of the 5th switching tube and be connected with the control signal of outside respectively; The control end of described second switch pipe is controlled conducting or cut-off between the second end of the first end of described second switch pipe and described second switch pipe according to the control signal of described outside; The control end of described the 3rd switching tube is controlled conducting or cut-off between the second end of the first end of described the 3rd switching tube and described the 3rd switching tube according to the control signal of described outside; The control end of described the 4th switching tube is controlled conducting or cut-off between the second end of the first end of described the 4th switching tube and described the 4th switching tube according to the control signal of described outside; The control end of described the 5th switching tube is controlled conducting or cut-off between the second end of the first end of described the 5th switching tube and described the 5th switching tube according to the control signal of described outside; Described second switch pipe is connected with an end on the described former limit of described transformer with the link of described the 4th switching tube, and described the 3rd switching tube is connected with the other end on the described former limit of described transformer with the link of described the 5th switching tube.
Further, the control signal of described outside is pulse-width signal.
Further, described second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube are metal-oxide-semiconductor.
Further, described rectification unit comprises: the second one-way conduction element that is connected in series and the 4th one-way conduction element, the 3rd one-way conduction element that is connected in series and the 5th one-way conduction element, and the second filter element; Described the second one-way conduction element be connected the end that is connected in series of the 4th one-way conduction element and be connected with an end of the described secondary of described transformer, described the 3rd one-way conduction element be connected being connected in series of the 5th one-way conduction element and hold with the other end of the described secondary of described transformer and be connected; The non-series connection end of described the second one-way conduction element is connected rear output as described DC-DC isolation module with the non-series connection end of described the 3rd one-way conduction element; The equal ground connection of non-series connection end of the non-series connection end of described the 4th one-way conduction element and described the 5th one-way conduction element; One end of described the second filter element is connected to the non-series connection end of described the second one-way conduction element, the other end ground connection of described the second filter element.
Further, described the second one-way conduction element, the 3rd one-way conduction element, the 4th one-way conduction element and the 5th one-way conduction element are diode.
The purpose of the embodiment of the present invention also is to provide a kind of photovoltaic inverting system, comprising: photovoltaic battery panel and the grid-connected inverter circuit that is connected with described photovoltaic battery panel, described grid-connected inverter circuit are above-mentioned grid-connected inverter circuit.
In embodiments of the present invention, the grid-connected inverter circuit of DC-isolation is by adopting the DC-DC modular converter that the boost input range of processing the grid-connected inverter circuit that makes DC-isolation of the direct voltage that receives is wide; Adopt simultaneously that the DC-DC isolation module is isolated, rectification and filtering process after the output DC bus-bar voltage, then by DC-AC inversion output module, DC bus-bar voltage is converted to and exports after exchanging grid-connected current, improved the conversion efficiency of complete machine.
Description of drawings
Fig. 1 is the modular structure figure of the grid-connected inverter circuit of the DC-isolation that provides of the embodiment of the present invention;
Fig. 2 is the physical circuit figure of the grid-connected inverter circuit of the DC-isolation that provides of the embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The grid-connected inverter circuit of the DC-isolation that the embodiment of the present invention provides is mainly used in photovoltaic inverting system, Fig. 1 shows the modular structure of the grid-connected inverter circuit of DC-isolation, for convenience of explanation, only show the part relevant to the embodiment of the present invention, details are as follows:
Photovoltaic inverting system comprises photovoltaic battery panel 1 and the grid-connected inverter circuit that is connected with photovoltaic battery panel 1; In whole photovoltaic inverting system, the cost of photovoltaic polycrystal silicon cell plate accounts for more than 50%, and the hull cell plate is more and more used with respect to the common advantage of polycrystal silicon cell plate on price.And for the hull cell plate, it will cause larger leakage current to the distinctive high parasitic capacitance of the earth, and this just requires the necessary ground connection of negative or positive electrode of cell panel, compare with the inverter of non-isolation, can better realize this function with the inverter of isolating transformer.This grid-connected inverter circuit is isolated the direct voltage of photovoltaic battery panel 1 output of input fully with the civil power 5 that is incorporated into the power networks, and can better solve leakage problem, satisfies the safety requirement of the national electrical isolation such as America and Europe.。
The grid-connected inverter circuit of DC-isolation comprises: DC-DC modular converter 2, DC-DC isolation module 3 and DC-AC (Direct Current-Alternating Current, direct current is delivered stream) inversion output module 4; Wherein, DC-DC modular converter 2 boosts the direct voltage that receives or the rear output of step-down processing; The input of DC-DC isolation module 3 is connected to the output of DC-DC modular converter 2, DC-DC isolation module 3 with the output of DC-DC modular converter 2 isolate, rectification and filtering process after the output DC bus-bar voltage; The input of DC-AC inversion output module 4 is connected to the output of DC-DC isolation module 3, and the DC bus-bar voltage that DC-AC inversion output module 4 is exported DC-DC isolation module 3 is exported after being converted to and exchanging grid-connected current.
In embodiments of the present invention, DC-DC modular converter 2 can adopt DC voltage booster circuit, also can adopt direct-current voltage reducing circuit.For adapting to the variation of external condition (as illumination amplitude, temperature etc.), require photovoltaic DC-to-AC converter must have wider input voltage range, particularly the hull cell plate has the high characteristics of voltage with respect to common polycrystal silicon cell plate, and its voltage range is wider; Traditional photovoltaic DC-to-AC converter is difficult to satisfy this characteristic of hull cell plate, and in the grid-connected inverter circuit of the DC-isolation that provides in the embodiment of the present invention, DC-DC modular converter 2 adopts DC voltage booster circuit to be easy to satisfy this requirement of wide input voltage range.
Particularly, DC-DC modular converter 2 adopts the BOOST booster circuits, and when the direct voltage of input during less than the voltage set, the BOOST circuit working is with the rear output of boosting of the direct voltage of input; During more than or equal to the voltage set, the BOOST circuit is not worked when the direct voltage of input, directly with the direct voltage output of input.
The concrete circuit of this BOOST booster circuit as shown in Figure 2, details are as follows: DC-DC modular converter 2 comprises: inductance L, the first one-way conduction element, the first switching tube and the first filter element; Wherein, an end of the first one-way conduction element is connected with direct voltage by inductance L, and the other end of the first one-way conduction element is as the output of DC-DC modular converter 2; The first end of the first switching tube is connected to an end of the first one-way conduction element, the second end ground connection of the first switching tube, the control end of the first switching tube is connected with outside control signal, and the control end of the first switching tube is according to conducting or cut-off between the second end of the first end of control signal control first switching tube of outside and the first switching tube; One end of the first filter element is connected to the other end of the first one-way conduction element, the other end ground connection of the first filter element.Wherein, the control signal that is used for the outside of control the first switching tube can be pulse-width signal, also can be other control signal.
As one embodiment of the present of invention, the first one-way conduction element can be diode D1; Wherein, the anode of diode D1 is connected with direct voltage by inductance L, and the negative electrode of diode D1 is as the output of DC-DC modular converter 2.
As one embodiment of the present of invention, the first switching tube can be field effect transistor, triode or controllable silicon.As shown in Figure 2, when the first switching tube is metal-oxide-semiconductor S1, the source electrode of metal-oxide-semiconductor S1 is connected to the anode of diode D1, the grounded drain of metal-oxide-semiconductor S1, the grid of metal-oxide-semiconductor S1 is connected with outside control signal, and the grid of metal-oxide-semiconductor S1 is according to conducting or cut-off between the drain electrode of the source electrode of the control signal control metal-oxide-semiconductor S1 of outside and metal-oxide-semiconductor S1.
As an alternative embodiment of the invention, the first filter element can be capacitor C 1, and an end of capacitor C 1 is connected to the negative electrode of diode D1, the other end ground connection of capacitor C 1.
In embodiments of the present invention, DC-DC isolation module 3 comprises: power stage circuit 31, transformer 32 and rectification unit 33; Wherein power stage circuit 31 is connected to the former limit of transformer 32, and rectification unit 33 is connected to the secondary of transformer 32.
Wherein, power stage circuit 31 can adopt half-bridge circuit, full-bridge circuit or push-pull circuit.Now be described as follows as an example of full-bridge circuit example: power stage circuit 31 comprises second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube; The first end of second switch pipe is connected to the output of DC-DC modular converter 2; The first end of the 4th switching tube is connected to the second end of second switch pipe; The second end ground connection of the 4th switching tube; The first end of the 3rd switching tube is connected to the first end of second switch pipe; The first end of the 5th switching tube is connected to the second end of the 3rd switching tube; The second end ground connection of the 5th switching tube; The control end of the control end of the control end of the control end of second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube is connected with the control signal of outside respectively; The control end of second switch pipe is controlled conducting or cut-off between the second end of the first end of second switch pipe and second switch pipe according to the control signal of outside; The control end of the 3rd switching tube is controlled conducting or cut-off between the second end of the first end of the 3rd switching tube and the 3rd switching tube according to the control signal of outside; The control end of the 4th switching tube is controlled conducting or cut-off between the second end of the first end of the 4th switching tube and the 4th switching tube according to the control signal of outside; The control end of the 5th switching tube is controlled conducting or cut-off between the second end of the first end of the 5th switching tube and the 5th switching tube according to the control signal of outside; The link of second switch Guan Yudi four switching tubes is connected with an end on the former limit of transformer 32, and the 3rd switching tube is connected with the other end on the former limit of transformer 32 with the link of the 5th switching tube.Wherein, pulse-width signal can be for the control signal of controlling respectively the outside of second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube, also other control signal can be.
As one embodiment of the present of invention, second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube all can be metal-oxide-semiconductor.As shown in Figure 2, when the second switch pipe be metal-oxide-semiconductor S2, the 3rd switching tube be metal-oxide-semiconductor S3, the 4th switching tube be metal-oxide-semiconductor S4, when the 5th switching tube is metal-oxide-semiconductor S5, the source electrode of metal-oxide-semiconductor S2 is connected to the output of DC-DC modular converter 2; The source electrode of metal-oxide-semiconductor S4 is connected to the drain electrode of metal-oxide-semiconductor S2; The grounded drain of metal-oxide-semiconductor S4; The source electrode of metal-oxide-semiconductor S3 is connected to the source electrode of metal-oxide-semiconductor S2; The source electrode of metal-oxide-semiconductor S5 is connected to the drain electrode of metal-oxide-semiconductor S3; The grounded drain of metal-oxide-semiconductor S5; The grid of the grid of the grid of metal-oxide-semiconductor S2, metal-oxide-semiconductor S3, metal-oxide-semiconductor S4 is connected grid and is connected with the control signal of outside respectively with metal-oxide-semiconductor S5; The grid of metal-oxide-semiconductor S2 is controlled conducting or cut-off between the drain electrode of the source electrode of metal-oxide-semiconductor S2 and metal-oxide-semiconductor S2 according to the control signal of outside; The grid of metal-oxide-semiconductor S3 is controlled conducting or cut-off between the drain electrode of the source electrode of metal-oxide-semiconductor S3 and metal-oxide-semiconductor S3 according to the control signal of outside; The grid of metal-oxide-semiconductor S4 is controlled conducting or cut-off between the drain electrode of the source electrode of metal-oxide-semiconductor S4 and metal-oxide-semiconductor S4 according to the control signal of outside; The grid of metal-oxide-semiconductor S5 is controlled conducting or cut-off between the drain electrode of the source electrode of metal-oxide-semiconductor S5 and metal-oxide-semiconductor S5 according to the control signal of outside; Metal-oxide-semiconductor S2 is connected with an end on the former limit of transformer with the link of metal-oxide-semiconductor S4, and metal-oxide-semiconductor S3 is connected with the other end on the former limit of transformer with the link of metal-oxide-semiconductor S5.
In embodiments of the present invention, transformer 32 can adopt high frequency transformer TX.Adopt transformer TX can realize DC-isolation, then the direct voltage pulse after the fixed duty cycle modulation obtain DC bus-bar voltage through diode rectification and capacitor filtering.
In embodiments of the present invention, rectification unit 33 comprises: the second one-way conduction element, the 3rd one-way conduction element, the 4th one-way conduction element, the 5th one-way conduction element and the second filter element; Wherein the second one-way conduction element and the 4th one-way conduction element are connected in series, the 3rd one-way conduction element and the 5th one-way conduction element are connected in series, the end that is connected in series of the second one-way conduction element and the 4th one-way conduction element is connected with an end of the secondary of transformer 32, and the end that is connected in series of the 3rd one-way conduction element and the 5th one-way conduction element is connected with the other end of the secondary of transformer 32; The non-series connection end of the second one-way conduction element is connected rear output as DC-DC isolation module 3 with the non-series connection end of the 3rd one-way conduction element; The equal ground connection of non-series connection end of the non-series connection end of the 4th one-way conduction element and the 5th one-way conduction element; One end of the second filter element is connected to the non-series connection end of the second one-way conduction element, the other end ground connection of the second filter element.
As one embodiment of the present of invention, the second one-way conduction element D2, the 3rd one-way conduction element D3, the 4th one-way conduction element D4 and the 5th one-way conduction element D5 all can be diode.As shown in Figure 2, when the second one-way conduction element be diode D2, the 3rd one-way conduction element be diode D3, the 4th one-way conduction element be diode D4, when the 5th one-way conduction element is diode D5, the anode of diode D2 is connected with the negative electrode of diode D4, the anode of diode D3 is connected with the negative electrode of diode D5, the plus earth of diode D4, the plus earth of diode D5, the negative electrode of diode D2 are connected rear output as DC-DC isolation module 3 with the negative electrode of diode D3.
As an alternative embodiment of the invention, the second filter element can be capacitor C 2, and an end of capacitor C 2 is connected to the negative electrode of diode D2 and the negative electrode of diode D3, the other end ground connection of capacitor C 2.
In embodiments of the present invention, DC-AC inversion output module 4 can be half-bridge circuit, also can be full-bridge circuit; DC-AC inversion output module 4 is used for converting the DC bus-bar voltage of DC-DC isolation module 3 outputs to 50HZ or the output of 60HZ interchange grid-connected current.
For the grid-connected inverter circuit of the DC-isolation that the embodiment of the present invention provides further is described, now in conjunction with Fig. 2 in detail its operation principle is described in detail as follows:
DC-DC modular converter 2 boosts the direct voltage that receives and processes rear output; Outside control signal is controlled the duty ratio of two brachium pontis (being comprised of metal-oxide-semiconductor S2, metal-oxide-semiconductor S3, metal-oxide-semiconductor S4 and metal-oxide-semiconductor S5) of full-bridge circuit in DC-DC isolation module 3, makes each brachium pontis duty ratio be controlled at all the time 50%.When metal-oxide-semiconductor S2 and metal-oxide-semiconductor S5 conducting, current circuit is: pass through successively metal-oxide-semiconductor S2, transformer TX and metal-oxide-semiconductor S5 to negative pole, energy is delivered to the secondary of transformer TX simultaneously, then passes through diode D3, capacitor C 2, and diode D4 flow back into the secondary of transformer; When metal-oxide-semiconductor S3 and metal-oxide-semiconductor S4 conducting, current circuit is: pass through successively metal-oxide-semiconductor S3, transformer TX and metal-oxide-semiconductor S4 to negative pole, energy is delivered to the secondary of transformer TX simultaneously, then passes through diode D2, capacitor C 2, and diode D5 flow back into the secondary of transformer.Because the duty ratio of 2 brachium pontis is controlled at 50% all the time, be exactly DC bus-bar voltage through the voltage after diode (D2, D3, D4, D5) rectification; The DC bus-bar voltage that obtains is exported through DC-AC inversion output module 4 and is incorporated into the power networks.
The grid-connected inverter circuit of the DC-isolation that the embodiment of the present invention provides is by controlling the duty ratio of two brachium pontis of full-bridge circuit in DC-DC isolation module 3, make each brachium pontis duty ratio be controlled at all the time 50%, the duty ratio of such two brachium pontis is exactly 100%, be that 1 high frequency transformer TX and the voltage after diode rectification are exactly DC bus-bar voltage through no-load voltage ratio again, need not filter inductance; Because the voltage of the rectifier diode of the secondary of high frequency transformer TX is exactly DC bus-bar voltage, greatly cut down the stress of diode; In addition, compared with prior art, owing to having removed filter inductance, make the conversion efficiency of the grid-connected inverter circuit of whole DC-isolation promote widely.
In embodiments of the present invention, the grid-connected inverter circuit of DC-isolation is by adopting the DC-DC modular converter that the boost input range of processing the grid-connected inverter circuit that makes DC-isolation of the direct voltage that receives is wide; Adopt simultaneously that the DC-DC isolation module is isolated, rectification and filtering process after the output DC bus-bar voltage, then by DC-AC inversion output module, DC bus-bar voltage is converted to and exports after exchanging grid-connected current, improved the conversion efficiency of complete machine.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the grid-connected inverter circuit of a DC-isolation, is characterized in that, comprising:
The DC-DC modular converter boosts the direct voltage that receives or rear output is processed in step-down;
The DC-DC isolation module, its input is connected to the output of described DC-DC modular converter, with the output of described DC-DC modular converter isolate, rectification and filtering process after the output DC bus-bar voltage; And
DC-AC inversion output module, its input is connected to the output of described DC-DC isolation module, described DC bus-bar voltage is converted to export after exchanging grid-connected current.
2. grid-connected inverter circuit as claimed in claim 1, is characterized in that, described DC-DC modular converter comprises:
Inductance, the first one-way conduction element, the first switching tube and the first filter element;
One end of described the first one-way conduction element is connected with described direct voltage by described inductance, and the other end of described the first one-way conduction element is as the output of described DC-DC modular converter;
The first end of described the first switching tube is connected to an end of described the first one-way conduction element, the second end ground connection of described the first switching tube, the control end of described the first switching tube is connected with outside control signal, and the control end of described the first switching tube is according to conducting or cut-off between the second end of the first end of described first switching tube of control signal control of described outside and described the first switching tube;
One end of described the first filter element is connected to the other end of described the first one-way conduction element, the other end ground connection of described the first filter element.
3. grid-connected inverter circuit as claimed in claim 2, is characterized in that, described the first switching tube is field effect transistor, triode or controllable silicon.
4. grid-connected inverter circuit as claimed in claim 1 or 2, is characterized in that, described DC-DC isolation module comprises: transformer, the power stage circuit on former limit that is connected to described transformer and the rectification unit that is connected to the secondary of described transformer.
5. grid-connected inverter circuit as claimed in claim 4, is characterized in that, described power stage circuit comprises:
Second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube;
The first end of described second switch pipe is connected to the output of described DC-DC modular converter; The first end of described the 4th switching tube is connected to the second end of described second switch pipe; The second end ground connection of described the 4th switching tube;
The first end of described the 3rd switching tube is connected to the first end of described second switch pipe; The first end of described the 5th switching tube is connected to the second end of described the 3rd switching tube; The second end ground connection of described the 5th switching tube;
The control end of the control end of the control end of described second switch pipe, described the 3rd switching tube, described the 4th switching tube be connected the control end of the 5th switching tube and be connected with the control signal of outside respectively;
The control end of described second switch pipe is controlled conducting or cut-off between the second end of the first end of described second switch pipe and described second switch pipe according to the control signal of described outside; The control end of described the 3rd switching tube is controlled conducting or cut-off between the second end of the first end of described the 3rd switching tube and described the 3rd switching tube according to the control signal of described outside; The control end of described the 4th switching tube is controlled conducting or cut-off between the second end of the first end of described the 4th switching tube and described the 4th switching tube according to the control signal of described outside; The control end of described the 5th switching tube is controlled conducting or cut-off between the second end of the first end of described the 5th switching tube and described the 5th switching tube according to the control signal of described outside;
Described second switch pipe is connected with an end on the described former limit of described transformer with the link of described the 4th switching tube, and described the 3rd switching tube is connected with the other end on the described former limit of described transformer with the link of described the 5th switching tube.
6. grid-connected inverter circuit as described in claim 2 or 5, is characterized in that, the control signal of described outside is pulse-width signal.
7. grid-connected inverter circuit as claimed in claim 5, is characterized in that, described second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube are metal-oxide-semiconductor.
8. grid-connected inverter circuit as claimed in claim 4, is characterized in that, described rectification unit comprises:
The the second one-way conduction element that is connected in series and the 4th one-way conduction element,
The 3rd one-way conduction element that is connected in series and the 5th one-way conduction element, and
The second filter element;
Described the second one-way conduction element be connected the end that is connected in series of the 4th one-way conduction element and be connected with an end of the described secondary of described transformer, described the 3rd one-way conduction element be connected being connected in series of the 5th one-way conduction element and hold with the other end of the described secondary of described transformer and be connected;
The non-series connection end of described the second one-way conduction element is connected rear output as described DC-DC isolation module with the non-series connection end of described the 3rd one-way conduction element; The equal ground connection of non-series connection end of the non-series connection end of described the 4th one-way conduction element and described the 5th one-way conduction element;
One end of described the second filter element is connected to the non-series connection end of described the second one-way conduction element, the other end ground connection of described the second filter element.
9. grid-connected inverter circuit as claimed in claim 8, is characterized in that, described the second one-way conduction element, the 3rd one-way conduction element, the 4th one-way conduction element and the 5th one-way conduction element are diode.
10. a photovoltaic inverting system, is characterized in that, comprising: photovoltaic battery panel and the grid-connected inverter circuit that is connected with described photovoltaic battery panel, described grid-connected inverter circuit are grid-connected inverter circuit claimed in claim 1.
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| CN2011103781038A CN103138610A (en) | 2011-11-24 | 2011-11-24 | Direct current isolated grid-connected inverter circuit and photovoltaic inverter system |
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| CN2011103781038A CN103138610A (en) | 2011-11-24 | 2011-11-24 | Direct current isolated grid-connected inverter circuit and photovoltaic inverter system |
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| CN2011103781038A Pending CN103138610A (en) | 2011-11-24 | 2011-11-24 | Direct current isolated grid-connected inverter circuit and photovoltaic inverter system |
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Cited By (1)
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| CN104269843A (en) * | 2014-10-29 | 2015-01-07 | 珠海格力电器股份有限公司 | Photovoltaic air-conditioner power supply circuit and photovoltaic air-conditioner |
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| CN104269843B (en) * | 2014-10-29 | 2017-12-19 | 珠海格力电器股份有限公司 | PV air-conditioner power supply circuit and PV air-conditioner |
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