CN104113222A - Protection circuit of photovoltaic inverter - Google Patents
Protection circuit of photovoltaic inverter Download PDFInfo
- Publication number
- CN104113222A CN104113222A CN201410316978.9A CN201410316978A CN104113222A CN 104113222 A CN104113222 A CN 104113222A CN 201410316978 A CN201410316978 A CN 201410316978A CN 104113222 A CN104113222 A CN 104113222A
- Authority
- CN
- China
- Prior art keywords
- protection switch
- photovoltaic
- input terminal
- converter
- circuit
- 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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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
-
- 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 invention provides a protection circuit of a photovoltaic inverter. The photovoltaic inverter comprises input terminals, output terminals and an internal circuit, and the input terminals and the output terminals are electrically connected with the internal circuit. The protection circuit comprises a safety protection switching device. The input terminals and the internal circuit are electrically connected through the safety protection switching device. The safety protection switching device comprises a plurality of protection switches connected in parallel, and each input terminal corresponds to one protection switch. The protection circuit of the photovoltaic inverter is simple in structure and easy to implement, and can prevent safety accidents like electric shock and improve the safety of the photovoltaic inverter.
Description
Technical field
The present invention relates to photovoltaic inversion technical field, particularly relate to a kind of protective circuit of photovoltaic DC-to-AC converter.
Background technology
The electrical energy changer that photovoltaic DC-to-AC converter is is alternating current by the DC inverter of solar panel generation.The output voltage of monolithic solar panel, power output have certain restriction, in practical application, need to, according to the index such as input voltage, power output of photovoltaic DC-to-AC converter, solar panel be carried out to serial or parallel connection.The solar panel of series connection can improve the input voltage of its output voltage with coupling photovoltaic DC-to-AC converter; Solar panel in parallel can increase its output current, according to the needs of photovoltaic DC-to-AC converter real output, has one or more input terminal.
The input terminal place of photovoltaic DC-to-AC converter, is reserved with the input interface of multichannel solar panel, and these input interfaces are independently in outside, but are directly electrically connected at internal circuit.When Dang You mono-road solar panel output accesses the input terminal of photovoltaic DC-to-AC converter, remaining input terminal is unsettled, but because all input terminals inside is electrically connected, these unsettled input terminals are also by charged.And these unsettled input terminals are generally positioned at the outside of photovoltaic DC-to-AC converter control cabinet, facilitate wiring, but make possibly people think no electricity by mistake, thereby lose vigilance, touch because of carelessness or touch these unsettled input terminals, there is electric shock and other safety accidents.
Summary of the invention
For easily the get an electric shock problem of security incident of conventional art, the invention provides a kind of simple in structurely, prevent the protective circuit of the photovoltaic DC-to-AC converter of accidental shock accident.
For reaching goal of the invention, the invention provides a kind of protective circuit of photovoltaic DC-to-AC converter, described photovoltaic DC-to-AC converter comprises input terminal, lead-out terminal and internal circuit, described input terminal and described lead-out terminal are electrically connected with described internal circuit respectively, and described protective circuit comprises safety protection switch device;
Described input terminal and described internal circuit are by described safety protection switch device electrical connection;
Described safety protection switch device comprises the protection switch of multiple parallel connections, the corresponding described protection switch of each described input terminal.
As a kind of embodiment, the quantity of described protection switch is identical with the quantity of described input terminal, and corresponding one by one.
As a kind of embodiment, the quantity of described protection switch is 8.
As a kind of embodiment, described safety protection switch device is fixed on the mainboard of described internal circuit.
As a kind of embodiment, also comprise control cabinet;
Described internal circuit and described safety protection switch device are arranged in described control cabinet.
As a kind of embodiment, described safety protection switch device is fixed on the sidewall of described control cabinet.
As a kind of embodiment, described protection switch is guillotine type switch, key switch or tumbler switch.
As a kind of embodiment, described protection switch is short-circuit block, short circuit cap or the circlip type break-make structure with on-off action.
Beneficial effect of the present invention comprises:
The protective circuit of photovoltaic DC-to-AC converter of the present invention, comprises safety protection switch device, is arranged between input terminal and internal circuit, for realizing the safety protection function to photovoltaic DC-to-AC converter input terminal, also can realize other function.This safety protection switch device comprises the protection switch of multiple parallel connections, and the corresponding protection switch of each input terminal, protection switch for disconnect or closed input terminal and internal circuit between connection.In the time that photovoltaic DC-to-AC converter is normally worked, protection switch corresponding to input terminal that does not access solar panel wire disconnects, and can prevent the generation of electric shock and other safety accidents, improved the fail safe of photovoltaic DC-to-AC converter, and it is simple in structure, easy to implement.
Brief description of the drawings
Fig. 1 is the structural representation of an embodiment of the protective circuit of photovoltaic DC-to-AC converter of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the protective circuit of photovoltaic DC-to-AC converter of 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.
Shown in Figure 1, the embodiment of the present invention provides a kind of protective circuit of photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter comprises input terminal 1, lead-out terminal 2, internal circuit 4, and input terminal 1 and lead-out terminal 2 are electrically connected with internal circuit 4 respectively, and protective circuit comprises safety protection switch device 3; Input terminal 1 and internal circuit 4 are electrically connected by safety protection switch device 3; Safety protection switch device 3 comprises the protection switch of multiple parallel connections, the corresponding protection switch of each input terminal 1.
The protective circuit of the photovoltaic DC-to-AC converter that the embodiment of the present invention provides, wherein photovoltaic DC-to-AC converter comprises the input terminal 1 for accessing solar panel output, be used for accessing utility grid, the lead-out terminal 2 of output single-phase alternating current or three-phase alternating current and for the internal circuit of inverter current, protective circuit comprises safety protection switch device 3, be arranged between input terminal 1 and internal circuit 4, this safety protection switch device 3 comprises the protection switch of multiple parallel connections, and the corresponding protection switch of each input terminal 1, protection switch one end is electrically connected with input terminal 1, one end is electrically connected with internal circuit 4, for disconnect or closed internal circuit and input terminal between be connected, photovoltaic DC-to-AC converter generally has multiple input terminals 1, the corresponding protection switch of each input terminal 1, can ensure the fail safe of input terminal 1.In the time that the power output of solar panel is larger, the through-current capability of solid conductor is limited, need to adopt multiple conducting wires to access respectively multiple input terminals 1 of photovoltaic DC-to-AC converter; When the power output of solar panel hour, may only need to adopt one or a few wire to access respectively one or more input terminals 1 of photovoltaic DC-to-AC converter.In the time that photovoltaic DC-to-AC converter is normally worked; exist input terminal 1 to be not connected by wire with solar panel and unsettled; manually disconnect the connection of these unsettled input terminals 1 and internal circuit 4 by protection switch; make unsettled input terminal 1 not charged; and then prevent people from touching because of carelessness or touching these unsettled input terminals 1 and generation electric shock and other safety accidents; improved the fail safe of photovoltaic DC-to-AC converter, and the protective circuit of this photovoltaic DC-to-AC converter is simple in structure, easy to implement.
As a kind of embodiment, the quantity of protection switch is identical with the quantity of input terminal 1, and corresponding one by one.
The quantity that protection switch is set is identical with the quantity of input terminal 1, and corresponding one by one, can ensure that each input terminal 1 can disconnect with internal circuit 4, thereby ensures the fail safe of input terminal 1.Adopt this embodiment, implementer need not consider which input terminal 1 should access wire, and which input terminal can not access wire, for implementer, has reduced the complexity of operation, is easy to implement.
As a kind of embodiment, the quantity of protection switch is 8.
As shown in Figure 1; in this embodiment; input terminal 1 and protection switch have 8, and 8 protection switches are respectively the first protection switch S1, the second protection switch S2, the 3rd protection switch S3, the 4th protection switch S4, the 5th protection switch S5, the 6th protection switch S6, the 7th protection switch S7 and the 8th protection switch S8.One end of the first protection switch S1 is electrically connected with first input end, and the other end is electrically connected with internal circuit 4; One end of the second protection switch S2 is electrically connected with the second input terminal, and the other end is electrically connected with internal circuit 4; One end of the 3rd protection switch S3 is electrically connected with the 3rd input terminal, and the other end is electrically connected with internal circuit 4; One end of the 4th protection switch S4 is electrically connected with four-input terminal, and the other end is electrically connected with internal circuit 4; One end of the 5th protection switch S5 is electrically connected with the 5th input terminal, and the other end is electrically connected with internal circuit 4; One end of the 6th protection switch S6 is electrically connected with the 6th input terminal, and the other end is electrically connected with internal circuit 4; One end of the 7th protection switch S7 is electrically connected with the 7th input terminal, and the other end is electrically connected with internal circuit 4; One end of the 8th protection switch S8 is electrically connected with the 8th input terminal, and the other end is electrically connected with internal circuit 4.The corresponding protection switch of each input terminal 1; in the time that input terminal 1 does not access wire, disconnect its corresponding protection switch, it is disconnected and being connected of internal circuit 4; while preventing that photovoltaic DC-to-AC converter from normally working, unsettled input terminal 1 because of itself with the error shock that causes of forceful electric power.
As a kind of embodiment, safety protection switch device 3 is fixed on the mainboard of internal circuit 4.
Safety protection switch device 3 is fixed on the mainboard of internal circuit; safety protection switch device 3 can be welded on the mainboard of internal circuit; also can be connected electrically on the mainboard of internal circuit 4 in modes such as plug connectors, prevent its at will mobile fault bringing.
As a kind of embodiment, also comprise control cabinet 5, internal circuit 4 and safety protection switch device 3 are arranged in control cabinet 5.
Internal circuit 4 and safety protection switch device 3 are arranged in control cabinet 5, can prevent the safety failure that internal circuit 4 and safety protection switch device 3 bring, and can ensure again the neat and artistic of photovoltaic DC-to-AC converter.
As a kind of embodiment, safety protection switch device 3 is fixed on the sidewall of control cabinet 5.
Safety protection switch device 3 can or be bolted on the sidewall of control cabinet 5 by screw, has both facilitated implementer to operate, and can prevent that again it from arbitrarily moving.
As a kind of embodiment, protection switch is guillotine type switch, key switch or tumbler switch.
As a kind of embodiment, protection switch is short-circuit block, short circuit cap or the circlip type break-make structure with on-off action.
What deserves to be explained is, protection switch is not limited to switch and the structure in above-described embodiment, can also have for other structure of on-off action.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a protective circuit for photovoltaic DC-to-AC converter, described photovoltaic DC-to-AC converter comprises input terminal, lead-out terminal and internal circuit, described input terminal and described lead-out terminal are electrically connected with described internal circuit respectively, it is characterized in that:
Described protective circuit comprises safety protection switch device;
Described input terminal and described internal circuit are by described safety protection switch device electrical connection;
Described safety protection switch device comprises the protection switch of multiple parallel connections, the corresponding described protection switch of each described input terminal.
2. the protective circuit of photovoltaic DC-to-AC converter according to claim 1, is characterized in that, the quantity of described protection switch is identical with the quantity of described input terminal, and corresponding one by one.
3. the protective circuit of photovoltaic DC-to-AC converter according to claim 2, is characterized in that, the quantity of described protection switch is 8.
4. the protective circuit of photovoltaic DC-to-AC converter according to claim 1, is characterized in that, described safety protection switch device is fixed on the mainboard of described internal circuit.
5. the protective circuit of photovoltaic DC-to-AC converter according to claim 1, is characterized in that, also comprises control cabinet;
Described internal circuit and described safety protection switch device are arranged in described control cabinet.
6. the protective circuit of photovoltaic DC-to-AC converter according to claim 5, is characterized in that, described safety protection switch device is fixed on the sidewall of described control cabinet.
7. according to the protective circuit of the photovoltaic DC-to-AC converter described in claim 1 to 6 any one, it is characterized in that, described protection switch is guillotine type switch, key switch or tumbler switch.
8. according to the protective circuit of the photovoltaic DC-to-AC converter described in claim 1 to 6 any one, it is characterized in that, described protection switch is short-circuit block, short circuit cap or the circlip type break-make structure with on-off action.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410316978.9A CN104113222A (en) | 2014-07-04 | 2014-07-04 | Protection circuit of photovoltaic inverter |
| PCT/CN2015/083275 WO2016000658A1 (en) | 2014-07-04 | 2015-07-03 | Protection circuit for photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410316978.9A CN104113222A (en) | 2014-07-04 | 2014-07-04 | Protection circuit of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104113222A true CN104113222A (en) | 2014-10-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410316978.9A Pending CN104113222A (en) | 2014-07-04 | 2014-07-04 | Protection circuit of photovoltaic inverter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104113222A (en) |
| WO (1) | WO2016000658A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016000658A1 (en) * | 2014-07-04 | 2016-01-07 | 珠海格力电器股份有限公司 | Protection circuit for photovoltaic inverter |
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| CN201204436Y (en) * | 2008-06-06 | 2009-03-04 | 江苏津恒能源科技有限公司 | Electrical leakage detection protection device for solar photovoltaic parallel inverter |
| CN101976862A (en) * | 2010-09-27 | 2011-02-16 | 奇瑞汽车股份有限公司 | Charging pile system and operation strategy thereof |
| US20110210612A1 (en) * | 2010-02-26 | 2011-09-01 | Gerhard Leutwein | Inverter for photovoltaic systems |
| US20120163048A1 (en) * | 2010-12-22 | 2012-06-28 | Sma Solar Technology Ag | Inverter, power generation system and method of operating a power generation system |
| CN202333772U (en) * | 2011-11-04 | 2012-07-11 | 天宝电子（惠州）有限公司 | Input protection device for photovoltaic grid-connected inverter |
| CN103828164A (en) * | 2011-09-05 | 2014-05-28 | 德恩及索恩两合股份有限公司 | Method and device for overvoltage protection of an inverter of a photovoltaic system |
| CN204046437U (en) * | 2014-07-04 | 2014-12-24 | 珠海格力电器股份有限公司 | The protective circuit of photovoltaic DC-to-AC converter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202906447U (en) * | 2012-08-02 | 2013-04-24 | 江苏兆伏新能源有限公司 | Inverter protection circuit |
| CN103715983B (en) * | 2013-12-26 | 2016-03-30 | 广东易事特电源股份有限公司 | The failure detector of solar power system and method |
| CN104113222A (en) * | 2014-07-04 | 2014-10-22 | 珠海格力电器股份有限公司 | Protection circuit of photovoltaic inverter |
-
2014
- 2014-07-04 CN CN201410316978.9A patent/CN104113222A/en active Pending
-
2015
- 2015-07-03 WO PCT/CN2015/083275 patent/WO2016000658A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204436Y (en) * | 2008-06-06 | 2009-03-04 | 江苏津恒能源科技有限公司 | Electrical leakage detection protection device for solar photovoltaic parallel inverter |
| US20110210612A1 (en) * | 2010-02-26 | 2011-09-01 | Gerhard Leutwein | Inverter for photovoltaic systems |
| CN101976862A (en) * | 2010-09-27 | 2011-02-16 | 奇瑞汽车股份有限公司 | Charging pile system and operation strategy thereof |
| US20120163048A1 (en) * | 2010-12-22 | 2012-06-28 | Sma Solar Technology Ag | Inverter, power generation system and method of operating a power generation system |
| CN103828164A (en) * | 2011-09-05 | 2014-05-28 | 德恩及索恩两合股份有限公司 | Method and device for overvoltage protection of an inverter of a photovoltaic system |
| CN202333772U (en) * | 2011-11-04 | 2012-07-11 | 天宝电子（惠州）有限公司 | Input protection device for photovoltaic grid-connected inverter |
| CN204046437U (en) * | 2014-07-04 | 2014-12-24 | 珠海格力电器股份有限公司 | The protective circuit of photovoltaic DC-to-AC converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016000658A1 (en) * | 2014-07-04 | 2016-01-07 | 珠海格力电器股份有限公司 | Protection circuit for photovoltaic inverter |
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| Publication number | Publication date |
|---|---|
| WO2016000658A1 (en) | 2016-01-07 |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141022 |