CN202975231U - Direct-current anti-reverse detection system for photovoltaic grid-connected inverter - Google Patents
Direct-current anti-reverse detection system for photovoltaic grid-connected inverter Download PDFInfo
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- CN202975231U CN202975231U CN 201220710552 CN201220710552U CN202975231U CN 202975231 U CN202975231 U CN 202975231U CN 201220710552 CN201220710552 CN 201220710552 CN 201220710552 U CN201220710552 U CN 201220710552U CN 202975231 U CN202975231 U CN 202975231U
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- emitting diode
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Abstract
The utility model discloses a direct-current anti-reverse detection system for a photovoltaic grid-connected inverter, comprising an optocoupler and a diode, wherein the diode is serially connected with a light-emitting diode at the primary side of the optocoupler in the same direction, the negative pole of the diode is connected with a positive bus, the positive pole of the light-emitting diode at the primary side of the optocoupler is connected with a negative bus, and a resistor is serially connected between the diode and the positive bus, or between the light-emitting diode and the negative bus; and a collector at the secondary side of the optocoupler is connected with a control power supply, an emitter is connected with the 0V end of the control power supply via a current-limiting circuit, and the both ends of the light-emitting diode are reversely connected with a bypass diode in parallel. According to the direct-current anti-reverse detection system, a main circuit is isolated from a control circuit via the optocoupler, so that the safety of the control circuit is improved, and in the case that a photovoltaic cell panel is normally connected, the voltage of the emitter at the secondary side of the optocoupler is low-level; and in the case that the photovoltaic cell panel is reversely connected, the voltage of the emitter at the secondary side of the optocoupler is high-level, so that the control system can accurately detect whether the cell panel is reversely connected or not, and reporting the corresponding fault, and the damages of equipment or the photovoltaic cell panel due to the misoperations of working personnel are avoided.
Description
Technical field
The utility model relates to a kind of photovoltaic combining inverter direct current counnter attack detection system.
Background technology
At present photovoltaic combining inverter direct current counnter attack detection method, generally adopt voltage sensor or detect dc voltage by the electric resistance partial pressure mode, but these methods there are the following problems and shortcoming:
Adopt the voltage sensor mode to carry out the direct current counnter attack and detect, high cost can reduce the competitive edge of enterprise; If adopt electric resistance partial pressure to detect dc voltage, can reduce costs, but can make main circuit and control circuit not to isolate safely, reduce the security of system characteristic.The method that comprehensive above-mentioned factor proposes can reliable detection goes out whether reversal connection of DC side, can either reduce costs, and can improve the security of system characteristic again.
The utility model content
Technical problem to be solved in the utility model is: a kind of photovoltaic combining inverter direct current counnter attack detection system is provided, this detection system can safe and reliable detection DC side whether reversal connection, prevent in photovoltaic battery panel reversal connection situation, the photovoltaic battery panel that staff's maloperation causes or inverter apparatus damage.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of photovoltaic combining inverter direct current counnter attack detection system comprises optocoupler, diode; The light emitting diode series aiding connection of described diode and the former avris of optocoupler, the negative pole of described diode is connected with positive bus-bar, the positive pole of the light emitting diode of the former avris of described optocoupler is connected with negative busbar, is in series with resistance between described diode and positive bus-bar or between light emitting diode and negative busbar; Optical coupling secondary edges side collector connect to control power supply, and emitter is held and is connected with controlling power supply 0V by current-limiting circuit, described light emitting diode two ends reverse parallel connection bypass diode.
As a kind of preferred scheme, described current-limiting circuit comprises the current-limiting resistance between the 0V end that is series at emitter and controls power supply.
After having adopted technique scheme, effect of the present utility model is: with main circuit and control circuit isolation, increased the control circuit security by optocoupler, when photovoltaic battery panel normally connected, optical coupling secondary edges side emitter voltage was low level; When the photovoltaic battery panel reversal connection, optical coupling secondary edges side emitter voltage is high level, thereby can allow control system accurately detect whether reversal connection of cell panel, and quotes corresponding failure, avoids staff's maloperation to cause equipment or photovoltaic battery panel to damage.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the structure principle chart of the utility model embodiment;
Fig. 2 is the logic diagram of the utility model embodiment;
Embodiment
Below by specific embodiment, the utility model a kind of photovoltaic combining inverter direct current counnter attack detection system is described in further detail.
As shown in Figure 1, a kind of photovoltaic combining inverter direct current counnter attack detection system comprises optocoupler, diode; The light emitting diode series aiding connection of described diode and the former avris of optocoupler, the negative pole of described diode is connected with positive bus-bar, the positive pole of the light emitting diode of the former avris of described optocoupler is connected with negative busbar, is in series with resistance between described diode and positive bus-bar or between light emitting diode and negative busbar; Optical coupling secondary edges side collector connects the control power supply, emitter is connected with control power supply 0V end by current-limiting circuit, described current-limiting circuit comprises the current-limiting resistance between the 0V end that is series at emitter and controls power supply, described light emitting diode two ends reverse parallel connection bypass diode.
When photovoltaic battery panel normally connected, namely negative busbar connect negative pole, and positive bus-bar is anodal, resistance string one end is connected with the negative busbar negative pole, the other end is connected with the former avris of optocoupler, and then the former avris of optocoupler is connected to the positive bus-bar positive pole by diode, and optical coupling secondary edges side emitter voltage is low level; And when the photovoltaic battery panel reversal connection, be that negative busbar connects positive pole, positive bus-bar is negative pole, resistance string one end is connected with the positive bus-bar negative pole, one end is connected with the former avris of optocoupler, and then the former avris of optocoupler is connected to the negative busbar positive pole by diode, and optical coupling secondary edges side emitter voltage is high level, thereby can allow control system accurately detect whether reversal connection of cell panel, and quote corresponding failure.
As shown in Figure 2, when dc voltage surpass to be set threshold values, inverter not yet moves generating, it is high level or low level that control system can detect the optocoupler emitter voltage, if be low level, and the inverter startup of can normally closing a floodgate; If be in high level can quote corresponding failure, alert is not carried out the DC side closing operation, to guarantee the safety of generating set.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art, can also make some improvement under the prerequisite that does not break away from the utility model principle, these improvement also should be considered as protection domain of the present utility model.
Claims (2)
1. a photovoltaic combining inverter direct current counnter attack detection system, is characterized in that: comprise optocoupler, diode; The light emitting diode series aiding connection of described diode and the former avris of optocoupler, the negative pole of described diode is connected with positive bus-bar, the positive pole of the light emitting diode of the former avris of described optocoupler is connected with negative busbar, is in series with resistance between described diode and positive bus-bar or between light emitting diode and negative busbar; Optical coupling secondary edges side collector connect to control power supply, and emitter is held and is connected with controlling power supply 0V by current-limiting circuit, described light emitting diode two ends reverse parallel connection bypass diode.
2. a kind of photovoltaic combining inverter direct current counnter attack detection system as claimed in claim 1 is characterized in that: described current-limiting circuit comprises the current-limiting resistance between the 0V end that is series at emitter and controls power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710552 CN202975231U (en) | 2012-12-20 | 2012-12-20 | Direct-current anti-reverse detection system for photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710552 CN202975231U (en) | 2012-12-20 | 2012-12-20 | Direct-current anti-reverse detection system for photovoltaic grid-connected inverter |
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| Publication Number | Publication Date |
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| CN202975231U true CN202975231U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220710552 Expired - Fee Related CN202975231U (en) | 2012-12-20 | 2012-12-20 | Direct-current anti-reverse detection system for photovoltaic grid-connected inverter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063972A (en) * | 2012-12-20 | 2013-04-24 | 江苏宏宝电子有限公司 | Photovoltaic grid-connected inverter direct current reverse-connection prevention detection system |
| CN105486968A (en) * | 2015-10-26 | 2016-04-13 | 常州大学 | DC input power reverse connection prevention device |
| CN106130481A (en) * | 2016-08-31 | 2016-11-16 | 上能电气股份有限公司 | A kind of photovoltaic battery panel connects and counter identifies device |
| CN112748375A (en) * | 2019-10-31 | 2021-05-04 | 上海度普新能源科技有限公司 | Battery cell line sequence detection system |
-
2012
- 2012-12-20 CN CN 201220710552 patent/CN202975231U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063972A (en) * | 2012-12-20 | 2013-04-24 | 江苏宏宝电子有限公司 | Photovoltaic grid-connected inverter direct current reverse-connection prevention detection system |
| CN105486968A (en) * | 2015-10-26 | 2016-04-13 | 常州大学 | DC input power reverse connection prevention device |
| CN106130481A (en) * | 2016-08-31 | 2016-11-16 | 上能电气股份有限公司 | A kind of photovoltaic battery panel connects and counter identifies device |
| CN112748375A (en) * | 2019-10-31 | 2021-05-04 | 上海度普新能源科技有限公司 | Battery cell line sequence detection system |
| CN112748375B (en) * | 2019-10-31 | 2022-07-29 | 上海度普新能源科技有限公司 | Electricity core line preface detecting system |
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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: 20130605 Termination date: 20171220 |