CN205123614U - Photovoltaic inverter circuit - Google Patents
Photovoltaic inverter circuit Download PDFInfo
- Publication number
- CN205123614U CN205123614U CN201520881186.6U CN201520881186U CN205123614U CN 205123614 U CN205123614 U CN 205123614U CN 201520881186 U CN201520881186 U CN 201520881186U CN 205123614 U CN205123614 U CN 205123614U
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- CN
- China
- Prior art keywords
- master switch
- booster circuit
- energy storage
- storage inductor
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 utility model provides a photovoltaic inverter circuit, includes, direct -current input end, a boost circuit, the 2nd boost circuit and interchange output, when the alternating current that exchanges the output is the positive half -wave, boost circuit work, the alternating current that exchanges the output is during for the burden half -wave, the work of the 2nd boost circuit, a boost circuit with the 2nd boost circuit includes two master switch, a freewheeling diode and an energy storage inductance respectively, the technical scheme of the utility model simple easy implementation can be stepped up and the contravariant in order realizing through a single -level circuit, can be applied to photovoltaic power generation system, has simplified the photovoltaic power generation contravariant system among the prior art.
Description
Technical field
The present invention is relevant photovoltaic DC-to-AC converter, and relates to a kind of single-stage photovoltaic inverter circuit especially.
Background technology
In photovoltaic generating system, output voltage due to photovoltaic battery panel is about 42V, but domestic power grid single-phase voltage is 220V, if directly to use or grid-connected so want the output voltage of photovoltaic battery panel to be transformed to mains voltage 220V, all the output voltage of photovoltaic battery panel to be carried out boosting inverter, as shown in Figure 1, for a kind of inversion scheme in known technology, the direct current of photovoltaic battery panel exports the inversion system connected and comprises DC-DC boost conversion circuit and DC-AC inverter circuit, described DC-DC boost conversion circuit first exports the direct current of described photovoltaic battery panel and carries out boosting inverter, by its boost in voltage to the voltage being applicable to load end requirement, DC inverter exports for exchanging by recycling DC-AC inverter circuit.
Two-stage type translation circuit needs to use more components and parts undoubtedly, this is just difficult to the design cost reducing circuit, in prior art, the converter of this two-stage type is mainly applied in miniature photovoltaic inverting system, the manufacturing cost of miniature photovoltaic DC-to-AC converter is approximately 1.2 yuan/watt, far above centralized large-sized photovoltaic electricity generation system, this superior miniature photovoltaic DC-to-AC converter that Here it is cannot be widely applied, thus, there is the puzzlement how reducing photovoltaic DC-to-AC converter manufacturing cost in prior art.
Summary of the invention
The utility model is thought just and in this, is provided a kind of photovoltaic DC-to-AC converter circuit, have single stage shift structure, simplicity of design.
The technical solution of the utility model, a kind of photovoltaic DC-to-AC converter circuit, comprise, direct-flow input end, input filter capacitor, first booster circuit, second booster circuit and output isolation transformer, ac output end, described direct-flow input end is in parallel with described input filter capacitor, described first booster circuit and described second booster circuit parallel connection, and the input of both is all in parallel with described input filter capacitor, output is all in parallel with the input of described isolating transformer, the output of described isolating transformer connects described ac output end, when the alternating current of described ac output end is positive half wave, described first booster circuit work, described second booster circuit turns off, when the alternating current of described ac output end is for negative half-wave, described second booster circuit work, the first booster circuit turns off.
In a specific embodiment of the present utility model, described first booster circuit comprises the first master switch, 3rd master switch, first fly-wheel diode and the first energy storage inductor, when the first booster circuit work, described direct-flow input end, first master switch, first energy storage inductor, 3rd master switch and ac output end series connection, 3rd master switch conducting, first conducting of master switch high frequency or shutoff, carry out copped wave, during the first master switch conducting, the DC input voitage of described direct-flow input end is described first energy storage inductor charging, when described first master switch turns off, described first energy storage inductor is by described first fly-wheel diode afterflow.
In a specific embodiment of the present utility model, described second booster circuit comprises the second master switch, 4th master switch, second fly-wheel diode and the second energy storage inductor, when the second booster circuit work, described direct-flow input end, second master switch, second energy storage inductor, 4th master switch and ac output end series connection, 4th master switch conducting, second conducting of master switch high frequency or shutoff, carry out copped wave, during the second master switch conducting, the DC input voitage of described direct-flow input end is described second energy storage inductor charging, when described second master switch turns off, described second energy storage inductor is by described second fly-wheel diode afterflow.
In a specific embodiment of the present utility model, described first booster circuit provides forward voltage for described ac output end, and described second booster circuit provides negative voltage for described ac output end.
For the above-mentioned feature and advantage of utility model can be become apparent, special embodiment below, and coordinate institute's accompanying drawings to be described in detail below.
Accompanying drawing explanation
Fig. 1 is a kind of electrical block diagram in known technology.
Fig. 2 is the circuit diagram of the utility model one specific embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The utility model embodiment provides a kind of photovoltaic DC-to-AC converter circuit, has the advantage being simple and easy to realize, and can reduce circuit design cost, below especially exemplified by the example that embodiment can be implemented really according to this as the present invention.In addition, all may part, in graphic and execution mode, use the assembly/component/step of identical label, be represent identical or like.
Fig. 2 is the circuit diagram of the utility model one specific embodiment, a kind of photovoltaic DC-to-AC converter circuit, comprise, direct-flow input end Vin, input filter capacitor C, first booster circuit 21, second booster circuit 22, isolating transformer T and ac output end Vout, described direct-flow input end Vin is in parallel with described input filter capacitor C, described first booster circuit 21 and described second booster circuit 22 parallel connection, and the input of both is all in parallel with described input filter capacitor C, output is all in parallel with the input of described isolating transformer T, the output of described isolating transformer T connects described ac output end Vout,
Described first booster circuit 21 comprises the first master switch S1, the 3rd master switch S3, the first sustained diode 1 and the first energy storage inductor L1; Described second booster circuit 22 comprises the second master switch S2, the 4th master switch S4, the second sustained diode 2 and the second energy storage inductor L2.
When the alternating current of described ac output end Vout is positive half wave, described first booster circuit 21 works, described second booster circuit 22 turns off, now, described direct-flow input end Vin, first master switch S1, first energy storage inductor L1, 3rd master switch S3 and ac output end Vout connects, 3rd master switch S3 conducting, first master switch S1 high frequency conducting or shutoff, during the first master switch S1 conducting, the DC input voitage of described direct-flow input end Vin is that described first energy storage inductor L1 charges, during described first master control S1 switch OFF, described first energy storage inductor L1 is by described first sustained diode 1 afterflow, in addition, second in the second booster circuit 22 and the 4th master switch S2, S4 all turn off.
When the alternating current of described ac output end Vout is for negative half-wave, described second booster circuit 22 works, described first booster circuit 21 turns off, now, described direct-flow input end Vin, second master switch S2, second energy storage inductor L2, 4th master switch S4 and ac output end Vout connects, 4th master switch S4 conducting, second master switch S2 high frequency conducting or shutoff, during the second master switch S2 conducting, the DC input voitage of described direct-flow input end Vin is that described second energy storage inductor L2 charges, during described second master control S2 switch OFF, described second energy storage inductor L2 is by described second sustained diode 2 afterflow, in addition, first in the first booster circuit 21 and the 3rd master switch S1, S3 all turn off.
In a specific embodiment of the present utility model, described first booster circuit provides forward voltage for described ac output end, and described second booster circuit provides negative voltage for described ac output end.
In sum, embodiment of the present utility model proposes a kind of automatic switching circuit, and the automatic switching circuit using this practical information to provide can reach the effect of quick automatic switching input power.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the utility model; have in any art and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection range of the present utility model is when being as the criterion depending on the accompanying claim person of defining.
Claims (4)
1. a photovoltaic DC-to-AC converter circuit, comprise, direct-flow input end, input filter capacitor, first booster circuit, second booster circuit and output isolation transformer, ac output end, described direct-flow input end is in parallel with described input filter capacitor, described first booster circuit and described second booster circuit parallel connection, and the input of both is all in parallel with described input filter capacitor, output is all in parallel with the input of described isolating transformer, the output of described isolating transformer connects described ac output end, when the alternating current of described ac output end is positive half wave, described first booster circuit work, described second booster circuit turns off, when the alternating current of described ac output end is for negative half-wave, described second booster circuit work, the first booster circuit turns off.
2. a kind of photovoltaic DC-to-AC converter circuit as claimed in claim 1, it is characterized in that, described first booster circuit comprises the first master switch, 3rd master switch, first fly-wheel diode and the first energy storage inductor, when the first booster circuit work, described direct-flow input end, first master switch, first energy storage inductor, 3rd master switch and ac output end series connection, 3rd master switch conducting, first conducting of master switch high frequency or shutoff, carry out copped wave, during the first master switch conducting, the DC input voitage of described direct-flow input end is described first energy storage inductor charging, when described first master switch turns off, described first energy storage inductor is by described first fly-wheel diode afterflow.
3. a kind of photovoltaic DC-to-AC converter circuit as claimed in claim 1, it is characterized in that, described second booster circuit comprises the second master switch, 4th master switch, second fly-wheel diode and the second energy storage inductor, when the second booster circuit work, described direct-flow input end, second master switch, second energy storage inductor, 4th master switch and ac output end series connection, 4th master switch conducting, second conducting of master switch high frequency or shutoff, carry out copped wave, during the second master switch conducting, the DC input voitage of described direct-flow input end is described second energy storage inductor charging, when described second master switch turns off, described second energy storage inductor is by described second fly-wheel diode afterflow.
4. a kind of photovoltaic DC-to-AC converter circuit as described in Claims 2 or 3, is characterized in that, described first booster circuit provides forward voltage for described ac output end, and described second booster circuit provides negative voltage for described ac output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881186.6U CN205123614U (en) | 2015-11-05 | 2015-11-05 | Photovoltaic inverter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520881186.6U CN205123614U (en) | 2015-11-05 | 2015-11-05 | Photovoltaic inverter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205123614U true CN205123614U (en) | 2016-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520881186.6U Expired - Fee Related CN205123614U (en) | 2015-11-05 | 2015-11-05 | Photovoltaic inverter circuit |
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| Country | Link |
|---|---|
| CN (1) | CN205123614U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105751915A (en) * | 2016-05-16 | 2016-07-13 | 蒋小春 | Photovoltaic energy storage direct current quick charging pile |
-
2015
- 2015-11-05 CN CN201520881186.6U patent/CN205123614U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105751915A (en) * | 2016-05-16 | 2016-07-13 | 蒋小春 | Photovoltaic energy storage direct current quick charging pile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 Termination date: 20161105 |