CN201204436Y - Electrical leakage detection protection device for solar photovoltaic parallel inverter - Google Patents
Electrical leakage detection protection device for solar photovoltaic parallel inverter Download PDFInfo
- Publication number
- CN201204436Y CN201204436Y CNU2008200364366U CN200820036436U CN201204436Y CN 201204436 Y CN201204436 Y CN 201204436Y CN U2008200364366 U CNU2008200364366 U CN U2008200364366U CN 200820036436 U CN200820036436 U CN 200820036436U CN 201204436 Y CN201204436 Y CN 201204436Y
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- electrically connected
- resistance
- series circuit
- thermistor
- power supply
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Abstract
The utility model discloses a current leakage detecting and protecting apparatus for solar grid-connected photovoltaic inverter, comprising a fuse F2, and a detection circuit 1, wherein the detection circuit 1 comprises an operational amplification U2A and a non-linearity optical couple U1, the negative input terminal of the operational amplification U2A earths by a resistance R6, the positive input terminal of the operational amplification U2A is electrically connected with the fuse F2, an output terminal of the operational amplification U2A is electrically connected with the non-linearity optical couple U1, the non-linearity optical couple U1 is electrically connected with a negative terminal of an LED D1, the positive terminal of the LED D1 is connected with one end of a resistance R9, and the other end of the resistance R9 is connected with the terminal VCC2 of auxiliary power supply. The apparatus of the utility model has simple circuit and low cost.
Description
Technical field
The utility model relates to a kind of solar photovoltaic interconnected inverter, specifically, relates to a kind of detection and protection apparatus for leakage of solar photovoltaic interconnected inverter.
Background technology
If the insulation property of electric equipment energising part are not good enough, with regard to entail dangers to human body safety, are necessary so carry out detection of electrical leakage, it mainly is in order to eliminate electric leakage, to exempt from thunderbolt and electrostatic induction.
The detection and protection apparatus for leakage of present solar photovoltaic interconnected inverter uses transducer, thereby the cost height, the circuit complexity.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of detection and protection apparatus for leakage that circuit is simple, cost is low that is used for solar photovoltaic interconnected inverter is provided.
The technical scheme that realizes above-mentioned purpose is: a kind of detection and protection apparatus for leakage of solar photovoltaic interconnected inverter; its improvement is: comprise fuse F2 and testing circuit; described testing circuit comprises amplifier U2A and non-linear optocoupler U1; the negative input end of described amplifier U2A is by resistance R 6 ground connection; the positive input terminal of amplifier U2A is electrically connected with fuse F2; the output of amplifier U2A is electrically connected with non-linear optocoupler U1; non-linear optocoupler U1 is electrically connected with the negative terminal of light-emitting diode D1; the anode of light-emitting diode D1 connects an end of resistance R 9, another termination accessory power supply terminals VCC2 of resistance R 9.
The positive input terminal of described amplifier U2A is electrically connected with fuse F2 by resistance R 11, and meets accessory power supply terminals VCC1 by resistance R 12.
The negative input end of described amplifier U2A connects an end of resistance R 7, and the other end of resistance R 7 connects accessory power supply terminals VCC1, and connects an end of resistance R 8, and the other end of resistance R 8 connects non-linear optocoupler U1.
The earth terminal of described resistance R 6 and capacitor C 1, one end of the series circuit of C2 is electrically connected, capacitor C 1, the other end of the series circuit of C2 and thermistor V4, one end of the series circuit of V5 is electrically connected, thermistor V4, the other end of the series circuit of V5 and thermistor V3, one end of the series circuit of V10 is electrically connected, thermistor V3, the other end ground connection of the series circuit of V10 and with thermistor V1, one end of the series circuit of V2 is electrically connected, thermistor V1, the other end of the series circuit of V2 and thermistor V4, one end of the series circuit of V5 is electrically connected and is electrically connected the earth terminal of resistance R 6 and thermistor V4 with the positive terminals of input power supply, the other end of the series circuit of V5 is electrically connected and is electrically connected with the negative terminals of input power supply.
The utility model circuit is simple, cost is low; in use; when receiving accessory power supply; the testing circuit of this detection and protection apparatus for leakage just can be worked; not only accessory power supply can be by the solar-powered high-pressure DC power supply of main power source; and accessory power supply also can be by mains-supplied; stop power supply thereby inverter when being in standby when the solar-powered high-pressure DC power supply like this; also can rely on accessory power supply that power supply is provided, make this detection and protection apparatus for leakage also can work and can detect and whether leak electricity by mains-supplied.
Description of drawings
Fig. 1 is a use block diagram of the present utility model;
Fig. 2 is the circuit diagram of embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
With reference to Fig. 1,2; a kind of detection and protection apparatus for leakage of solar photovoltaic interconnected inverter; comprise fuse F2 and testing circuit 1; described testing circuit 1 comprises amplifier U2A and non-linear optocoupler U1; the negative input end of described amplifier U2A is by resistance R 6 ground connection; the positive input terminal of amplifier U2A is electrically connected with fuse F2; the output of amplifier U2A is electrically connected with non-linear optocoupler U1; non-linear optocoupler U1 is electrically connected with the negative terminal of light-emitting diode D1; the anode of light-emitting diode D1 connects an end of resistance R 9, another termination accessory power supply terminals VCC2 of resistance R 9.Since used non-linear optocoupler U1 to isolate, with low cost, and circuit structure is simple.
The positive input terminal of described amplifier U2A is electrically connected with fuse F2 by resistance R 11, and meets accessory power supply terminals VCC1 by resistance R 12.The negative input end of described amplifier U2A connects an end of resistance R 7, and the other end of resistance R 7 connects accessory power supply terminals VCC1, and connects an end of resistance R 8, and the other end of resistance R 8 connects non-linear optocoupler U1.Circuit structure is simpler like this.
The earth terminal of described resistance R 6 and capacitor C 1, one end of the series circuit of C2 is electrically connected, capacitor C 1, the other end of the series circuit of C2 and thermistor V4, one end of the series circuit of V5 is electrically connected, thermistor V4, the other end of the series circuit of V5 and thermistor V3, one end of the series circuit of V10 is electrically connected, thermistor V3, the other end ground connection of the series circuit of V10 and with thermistor V1, one end of the series circuit of V2 is electrically connected, thermistor V1, the other end of the series circuit of V2 and thermistor V4, one end of the series circuit of V5 is electrically connected and is electrically connected with the positive terminals of input power supply, positive terminals at the input power supply are connected to fuse F1, the earth terminal of resistance R 6 and thermistor V4, the other end of the series circuit of V5 is electrically connected and is electrically connected with the negative terminals of input power supply.
When the utility model used, the input power supply was a solar cell, and accessory power supply connects utility grid, and the output of non-linear optocoupler U1 is electrically connected with control circuit.The control chip of control circuit can use digital signal processor (DSP), single-chip microcomputer or other microprocessor.When fuse F2 is intact, the positive input terminal voltage of amplifier U2A is (R11+R12) * VCC1, negative input end voltage is R6/ (R6+R7) * VCC1, positive input terminal voltage is lower than negative input end voltage, then the output voltage of amplifier U2A is a low level, and non-linear optocoupler U1 does not have signal output to digital signal processor (DSP); After fuse F2 damages disconnection, positive input terminal voltage is higher than negative input end voltage, then the output voltage of amplifier U2A is a high level, and non-linear optocoupler U1 then can effectively detect the operating state of fuse F2 to digital signal processor (DSP) output signal by the state of light-emitting diode D1.Owing to the output of amplifier UA2 can not change along with the change of input voltage, make the easier realization of detection of electrical leakage.
Claims (4)
1, a kind of detection and protection apparatus for leakage of solar photovoltaic interconnected inverter; it is characterized in that: comprise fuse F2 and testing circuit (1); described testing circuit (1) comprises amplifier U2A and non-linear optocoupler U1; the negative input end of described amplifier U2A is by resistance R 6 ground connection; the positive input terminal of amplifier U2A is electrically connected with fuse F2; the output of amplifier U2A is electrically connected with non-linear optocoupler U1; non-linear optocoupler U1 is electrically connected with the negative terminal of light-emitting diode D1; the anode of light-emitting diode D1 connects an end of resistance R 9, another termination accessory power supply terminals VCC2 of resistance R 9.
2, the detection and protection apparatus for leakage of solar photovoltaic interconnected inverter according to claim 1 is characterized in that: the positive input terminal of described amplifier U2A is electrically connected with fuse F2 by resistance R 11, and meets accessory power supply terminals VCC1 by resistance R 12.
3, the detection and protection apparatus for leakage of solar photovoltaic interconnected inverter according to claim 1 and 2; it is characterized in that: the negative input end of described amplifier U2A connects an end of resistance R 7; the other end of resistance R 7 connects accessory power supply terminals VCC1; and an end of connection resistance R 8, the other end of resistance R 8 connects non-linear optocoupler U1.
4; the detection and protection apparatus for leakage of solar photovoltaic interconnected inverter according to claim 3; it is characterized in that: the earth terminal of described resistance R 6 and capacitor C 1; one end of the series circuit of C2 is electrically connected; capacitor C 1; the other end of the series circuit of C2 and thermistor V4; one end of the series circuit of V5 is electrically connected; thermistor V4; the other end of the series circuit of V5 and thermistor V3; one end of the series circuit of V10 is electrically connected; thermistor V3; the other end ground connection of the series circuit of V10 and with thermistor V1; one end of the series circuit of V2 is electrically connected; thermistor V1; the other end of the series circuit of V2 and thermistor V4; one end of the series circuit of V5 is electrically connected and is electrically connected the earth terminal of resistance R 6 and thermistor V4 with the positive terminals of input power supply; the other end of the series circuit of V5 is electrically connected and is electrically connected with the negative terminals of input power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200364366U CN201204436Y (en) | 2008-06-06 | 2008-06-06 | Electrical leakage detection protection device for solar photovoltaic parallel inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200364366U CN201204436Y (en) | 2008-06-06 | 2008-06-06 | Electrical leakage detection protection device for solar photovoltaic parallel inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201204436Y true CN201204436Y (en) | 2009-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200364366U Expired - Fee Related CN201204436Y (en) | 2008-06-06 | 2008-06-06 | Electrical leakage detection protection device for solar photovoltaic parallel inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201204436Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106603227A (en) * | 2016-12-12 | 2017-04-26 | 江苏宝丰新能源科技有限公司 | Software and hardware encryption method applied to grid connected inverter |
-
2008
- 2008-06-06 CN CNU2008200364366U patent/CN201204436Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106603227A (en) * | 2016-12-12 | 2017-04-26 | 江苏宝丰新能源科技有限公司 | Software and hardware encryption method applied to grid connected inverter |
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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 |
Granted publication date: 20090304 Termination date: 20150606 |
|
| EXPY | Termination of patent right or utility model |