CN203608150U - Solar cell grounding device - Google Patents
Solar cell grounding device Download PDFInfo
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- CN203608150U CN203608150U CN201320834968.5U CN201320834968U CN203608150U CN 203608150 U CN203608150 U CN 203608150U CN 201320834968 U CN201320834968 U CN 201320834968U CN 203608150 U CN203608150 U CN 203608150U
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- 230000003068 static effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
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- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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
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Abstract
The utility model discloses a solar cell grounding device which comprises a photovoltaic assembly direct-current output anode, a photovoltaic assembly direct-current output cathode, a direct-current power supply, a relay and a grounding resistor. The direct-current power supply is connected between the photovoltaic assembly direct-current output ends and the relay. A normally-open contact of the relay is electrically connected with the photovoltaic assembly direct-current output cathode through the grounding resistor, and a normally-closed contact of the relay is directly electrically connected with the photovoltaic assembly direct-current output cathode. One end of a switch of the relay is capable of switching between the normally-closed contact and the normally-open contact under the effect of an electromagnet, and the other end of the switch of the relay is grounded. According to the utility model, the direct-current power supply is utilized to detect the working state of a photovoltaic assembly; when the photovoltaic assembly does not work, the output voltage of the direct-current power supply fails to actuate the relay, and the photovoltaic assembly direct-current output cathode is directly grounded, so that static charges are eliminated, and the attenuation of the photovoltaic assembly is prevented; and when the photovoltaic assembly works normally, the output voltage of the direct-current power supply actuates the relay, and the photovoltaic assembly direct-current output cathode is grounded through the resistor, so that the normal working of the photovoltaic assembly is ensured.
Description
Technical field
The utility model relates to technical field of solar batteries, relates in particular to a kind of solar cell earthing device.
Background technology
Photovoltaic module used after a period of time, generated output there will be the decay of certain amplitude, because can producing current potential, crystalline silicon component brings out decay (PID) effect, film assembly can produce transparent conductive oxide (TCO) layer and damage, if do not taken corrective action, the generated output of assembly will decline to a great extent, and has a strong impact on the income of photovoltaic system.
Industry mainly adopts inverter minus earth mode at present, eliminates the electrostatic charge on assembly, stops the generation of this situation.But this earthing mode, due to the topological structure principle difference of inverter, some occasion is inapplicable, and expense is higher:
1, because early stage photovoltaic engineering does not recognize that photovoltaic module has decay, a lot of inverters do not have minus earth device, and again install minus earth device additional in inverter the inside, and expense is very high.And the inverter structure layout having do not have space and circuit to be provided with spare interface, can not install minus earth device additional.
2, when inverter is normal, operating voltage is very high, from security standpoint, adopting minus earth mode to require inverter must be electrical separation, current domestic middle low power group string data inverter, major part is not electrical isolation, can not install minus earth device additional.
3, adopt the inverter of three level topological structures, inverter input has three current potentials, and anodal and negative pole can not ground connection, can not install minus earth device additional.
Utility model content
For the weak point existing in above-mentioned technology, the utility model provides a kind of solar cell earthing device that can eliminate electrostatic charge on photovoltaic module, is suitable for the photovoltaic plant projects such as old project reconstruction, non-isolation type inverter system, Three-Level Inverter System.
For achieving the above object, the utility model provides a kind of solar cell earthing device, comprises photovoltaic component DC output cathode, photovoltaic component DC output negative pole, DC power supply, relay and earth resistance; Described DC power supply has first input end, the second input, the first output and the second output, and described relay has electromagnet, normally-closed contact, normally opened contact and switch; Described photovoltaic module output cathode is electrically connected with the first input end of DC power supply, described photovoltaic component DC output negative pole is electrically connected with the second input of DC power supply, and the electromagnet of described relay is electrically connected between first output and the second output of DC power supply; The normally opened contact of described relay is electrically connected with photovoltaic component DC output negative pole by earth resistance, the normally-closed contact of described relay is directly electrically connected with photovoltaic component DC output negative pole, switch one end of described relay can be switched under the effect of electromagnet between normally-closed contact and normally opened contact, switch other end ground connection.
Wherein, described earth resistance is the large resistance earth resistance of 5 watts of 1 megaohms.
Wherein, described DC power supply is that input direct voltage is exported while being more than or equal to 100V when direct current 24V and input direct voltage are less than 100V and exported the DC power supply that direct current is less than 24V, and described relay is that operating voltage is the relay of 24V.
The beneficial effects of the utility model are: compared with prior art, the solar cell earthing device that the utility model provides, utilize DC power supply to detect the operating state of photovoltaic module, in the time that photovoltaic module is not worked, the output voltage of DC power supply can not make the actuating of relay, the direct ground connection of direct current output negative pole of photovoltaic module, eliminates electrostatic charge, and assurance photovoltaic module is not decayed.In the time that photovoltaic module is normally worked, the output voltage of DC power supply makes the actuating of relay, and the direct current output negative pole of photovoltaic module, by grounding through resistance, ensures that photovoltaic module normally moves.
This device can be used as a product isolated operation, also can be integrated in photovoltaic combiner box, DC power distribution cabinet, and photovoltaic DC-to-AC converter the inside, does not affect the normal operation of existing equipment.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of solar cell earthing device of the present utility model.
Main element symbol description is as follows:
10, photovoltaic component DC output cathode 11, photovoltaic component DC output negative pole
12, DC power supply 13, relay
14, earth resistance
Embodiment
In order more clearly to explain the utility model, below in conjunction with accompanying drawing, the utility model is further described.
Refer to Fig. 1, solar cell earthing device of the present utility model, comprises photovoltaic component DC output cathode 10, photovoltaic component DC output negative pole 11, DC power supply 12, relay 13 and earth resistance 14; DC power supply 12 has first input end, the second input, the first output and the second output, and relay 13 has electromagnet, normally-closed contact, normally opened contact and switch; Photovoltaic module output cathode 10 is electrically connected with the first input end of DC power supply 12, photovoltaic component DC output negative pole 11 is electrically connected with the second input of DC power supply 12, and the electromagnet of relay 13 is electrically connected between first output and the second output of DC power supply 12; The normally opened contact of relay 13 is electrically connected with photovoltaic component DC output negative pole 11 by earth resistance 14, the normally-closed contact of relay 13 is directly electrically connected with photovoltaic component DC output negative pole 11, switch one end of relay 13 can be switched under the effect of electromagnet between normally-closed contact and normally opened contact, switch other end ground connection.
Compared to the situation of prior art, the solar cell earthing device that the utility model provides, utilize DC power supply to detect the operating state of photovoltaic module, in the time that photovoltaic module is not worked, the output voltage of DC power supply can not make the actuating of relay, the direct ground connection of direct current output negative pole of photovoltaic module, eliminates electrostatic charge, and assurance photovoltaic module is not decayed.In the time that photovoltaic module is normally worked, the output voltage of DC power supply makes the actuating of relay, and the direct current output negative pole of photovoltaic module, by grounding through resistance, ensures that photovoltaic module normally moves.
In the present embodiment, above-mentioned earth resistance 14 is the large resistance earth resistance of 5 watts of 1 megaohms.Certainly, this case is not limited to the concrete resistance of earth resistance 14, as long as utilizing large resistance grounding through resistance to guarantee that photovoltaic module normally moves, and utilizes the direct ground connection of relay switch to eliminate the execution mode of electrostatic charge, all falls into the protection range of this case.
In the present embodiment, above-mentioned DC power supply is that input direct voltage is exported while being more than or equal to 100V when direct current 24V and input direct voltage are less than 100V and exported the DC power supply that direct current is less than 24V, and described relay is that operating voltage is the relay of 24V.Certainly; the threshold value that 100V is the normal operation of photovoltaic module is set in this case; it is only a kind of typical execution mode; be not limited to this threshold point; as long as utilizing DC power supply to judge the running status of photovoltaic module, and drive relay switch operating state, the first operating state is for utilizing large resistance grounding through resistance to guarantee that photovoltaic module normally moves; the second operating state is to utilize the direct ground connection of negative pole to eliminate the execution mode of electrostatic charge, all falls into the protection range of this case.
Advantage of the present utility model is: a kind of assembly earthing device is provided, and in the time of assembly normal power generation, the resistance by a high value is by the minus earth of assembly, when the work of assembly no-voltage, and the direct ground connection of negative pole.Photovoltaic component DC output cathode and photovoltaic component DC output negative pole connect respectively positive pole and the negative pole of photovoltaic module, and DC power supply 12 is DC-DC DC power supply, in the time that assembly both end voltage reaches 100Vdc, and DC power supply output 24V, the actuating of relay.Relay 13 normally opened contacts connect large resistance resistance 14, and in the time that photovoltaic system moves, assembly negative pole, by large resistance resistance 14 ground connection, can not affect the safety system of original system, insulation resistance measuring ability.When assembly both end voltage is less than 100Vdc, photovoltaic system quits work, and relay 13 disconnects, and photovoltaic component DC output negative pole, by the direct ground connection of relay 13 normally-closed contact, is eliminated the quiet lotus on assembly completely.
Disclosed is above only several specific embodiment of the present utility model, but the utility model is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection range of the present utility model.
Claims (3)
1. a solar cell earthing device, is characterized in that, comprises photovoltaic component DC output cathode, photovoltaic component DC output negative pole, DC power supply, relay and earth resistance; Described DC power supply has first input end, the second input, the first output and the second output, and described relay has electromagnet, normally-closed contact, normally opened contact and switch; Described photovoltaic module output cathode is electrically connected with the first input end of DC power supply, described photovoltaic component DC output negative pole is electrically connected with the second input of DC power supply, and the electromagnet of described relay is electrically connected between first output and the second output of DC power supply; The normally opened contact of described relay is electrically connected with photovoltaic component DC output negative pole by earth resistance, the normally-closed contact of described relay is directly electrically connected with photovoltaic component DC output negative pole, switch one end of described relay can be switched under the effect of electromagnet between normally-closed contact and normally opened contact, switch other end ground connection.
2. solar cell earthing device according to claim 1, is characterized in that, described earth resistance is the large resistance earth resistance of 5 watts of 1 megaohms.
3. solar cell earthing device according to claim 1, it is characterized in that, described DC power supply is that input direct voltage is exported while being more than or equal to 100V when direct current 24V and input direct voltage are less than 100V and exported the DC power supply that direct current is less than 24V, and described relay is that operating voltage is the relay of 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320834968.5U CN203608150U (en) | 2013-12-17 | 2013-12-17 | Solar cell grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320834968.5U CN203608150U (en) | 2013-12-17 | 2013-12-17 | Solar cell grounding device |
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| Publication Number | Publication Date |
|---|---|
| CN203608150U true CN203608150U (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320834968.5U Expired - Fee Related CN203608150U (en) | 2013-12-17 | 2013-12-17 | Solar cell grounding device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647504A (en) * | 2013-12-17 | 2014-03-19 | 刘继茂 | Solar cell grounding device and method |
| CN110829498A (en) * | 2019-11-28 | 2020-02-21 | 上海质卫环保科技有限公司 | Solar power station recovery and prevention system and method |
-
2013
- 2013-12-17 CN CN201320834968.5U patent/CN203608150U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647504A (en) * | 2013-12-17 | 2014-03-19 | 刘继茂 | Solar cell grounding device and method |
| CN103647504B (en) * | 2013-12-17 | 2015-09-23 | 刘继茂 | Solar cell earthing device and method |
| CN110829498A (en) * | 2019-11-28 | 2020-02-21 | 上海质卫环保科技有限公司 | Solar power station recovery and prevention system and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 |