CN204758699U - A insulating impedance detection circuitry for photovoltaic inverter - Google Patents
A insulating impedance detection circuitry for photovoltaic inverter Download PDFInfo
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- CN204758699U CN204758699U CN201520337209.7U CN201520337209U CN204758699U CN 204758699 U CN204758699 U CN 204758699U CN 201520337209 U CN201520337209 U CN 201520337209U CN 204758699 U CN204758699 U CN 204758699U
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Abstract
The utility model discloses an insulating impedance detection circuitry for photovoltaic inverter, its include dc -to -ac converter input circuit, with the resistance detection circuit that dc -to -ac converter input circuit is connected, dc -to -ac converter input circuit includes PV power, boost circuit, boost circuit last parallelly connected have be used for that thereby the short circuit of the closed boost circuit of messenger makes the switch of PV power direct loading on resistance detection circuit when PV mains voltage need not to step up. Compared with the prior art, the utility model has following advantage: 1. When having solved multichannel MPPT, the lengthy and tedious value of the moving nature of insulating impedance detection circuitry is not good, problem that software compatibility is poor, 2. To emerging energy storage type photovoltaic inverter, still can accurate detect out insulating impedance size during the PV no -voltage, 3. Reduce the loss of dc -to -ac converter, promoted conversion efficiency.
Description
Technical field
The utility model relates to a kind of insulation resistance detection circuit for photovoltaic DC-to-AC converter.
Background technology
The detection of input end insulation impedance is the safety demand of photovoltaic DC-to-AC converter, when impedance needs shutdown system lower than during certain threshold values, forbids running to ensure safety.As shown in Figure 1, 2, current conventional be that " electric resistance partial pressure scheme " is applied in different Resistance model for prediction by PV voltage, different state equations is used to obtain insulation impedance over the ground, but there is following problem: 1. for the system that MPPT way is different, electric resistance partial pressure model needs to change, and transplantability is bad.2., for the photovoltaic DC-to-AC converter of accumulation energy type, without PV, also just cannot use " electric resistance partial pressure scheme " to go to solve earth impedance in the evening.
Summary of the invention
The purpose of this utility model is to provide a kind of low energy consumption, full-time detection and the good insulation resistance detection circuit for photovoltaic DC-to-AC converter of transplantability.
For achieving the above object, the technical solution adopted in the utility model is: a kind of insulation resistance detection circuit for photovoltaic DC-to-AC converter, it resistance detecting circuit comprising inverter input circuit, be connected with described inverter input circuit, described inverter input circuit comprises PV power supply, booster circuit, described booster circuit is parallel with and makes booster circuit short circuit for closing when PV supply voltage is without the need to boosting thus make PV power supply directly load on switch on resistance detecting circuit.
Optimize, described resistance detecting circuit is connected with the BUS voltage as driving source.
Optimize, described resistance detecting circuit comprises first of series connection and detects resistance, second and detect resistance, the 3rd and detect resistance, be connected to described second and detect resistance and the 3rd and detect voltage monitoring instrument between resistance, the linkage section ground connection of described first testing circuit and the second testing circuit.
Because technique scheme is used, the utility model compared with prior art has following advantages: 1. when solving multichannel MPPT, and the lengthy and tedious portability of insulation resistance detection circuit is bad, the problem of software compatibility difference; 2., for emerging accumulation energy type photovoltaic DC-to-AC converter, during PV no-voltage, still can accurately detect insulation impedance size; 3. reduce the loss of inverter, improve conversion efficiency.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of existing photovoltaic DC-to-AC converter input circuit;
Accompanying drawing 2 is the schematic diagram of existing resistance detecting circuit;
Accompanying drawing 3 is the insulation resistance detection circuit figure of photovoltaic DC-to-AC converter in the utility model.
Embodiment
Below in conjunction with embodiment shown in the drawings, the utility model is further described.
As shown in Figure 3, insulation resistance detection circuit for photovoltaic DC-to-AC converter comprises inverter input circuit, resistance detecting circuit and provides the battery (not shown) of BUS voltage, inverter input circuit comprises the booster circuit of PV1 power supply and PV1 power supply and booster circuit, the electric capacity C3 of PV2 power supply and PV2 power supply respectively, and resistance detecting circuit is connected with described inverter input circuit.
The booster circuit of described PV1 power supply comprises inductance L 1, band damper diode IGBT field effect transistor Q1, diode D1, electric capacity C1.One end of described inductance L 1 is connected with the positive pole of described PV1 power supply, and its other end is connected with the C pole of described band damper diode IGBT field effect transistor Q1; The positive pole of diode D1 is connected with the other end of described inductance L 1, and its negative pole is connected with one end of electric capacity C1; The E pole of described diode IGBT field effect transistor Q1 is connected with the negative pole of described PV1 power supply, and the other end of described electric capacity C1 is connected with the negative pole of described PV1 power supply, and the two ends of C1 are also connected with the two ends of C3.
The booster circuit of described PV2 power supply comprises inductance L 2, band damper diode IGBT field effect transistor Q2, diode D2, electric capacity C2.One end of described inductance L 2 is connected with the positive pole of described PV2 power supply, and its other end is connected with the C pole of described band damper diode IGBT field effect transistor Q2; The positive pole of diode D2 is connected with the other end of described inductance L 2, and its negative pole is connected with one end of electric capacity C2; The E pole of described diode IGBT field effect transistor Q2 is connected with the negative pole of described PV2 power supply, and the other end of described electric capacity C2 is connected with the negative pole of described PV2 power supply, and the two ends of C2 are also connected with the two ends of C3.
When PV1 power supply, PV2 power input voltage are higher, without the need to boosting, booster circuit does not work; When PV1 power supply, PV2 power input voltage are lower, need boosting, booster circuit just works.When without the need to boosting, although booster circuit does not work, but electric current still flows through inductance L 1, inductance L 2, diode D1, diode D2, produce larger loss, therefore S1 in parallel in inductance L 1 and diode D1, S2 in parallel in inductance L 2 and diode D2, making inductance L 1 and diode D1, inductance L 2 and diode D2 be in short-circuit condition when without the need to boosting, effectively raising the conversion efficiency of inverter.
Evening PV1 power supply and PV2 power supply no-voltage time, BUS voltage still can accurately detect insulation impedance size as driving source.
Resistance detecting circuit comprises first of series connection and detects resistance R1, second and detect resistance R2, the 3rd and detect resistance R3, be connected to described second and detect resistance R2 and the 3rd and detect voltage monitoring instrument Vsample between resistance R3, and described first detects the linkage section ground connection that resistance R1 and second detects resistance R2.First detection resistance R1, second detects resistance R2, the 3rd detection resistance R3 is a fixing network, and can not change because of the change of MPPT way, the simple portability of model is good.
Above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalences done according to the utility model Spirit Essence change or modify, and all should be encompassed within protection domain of the present utility model.
Claims (3)
1. the insulation resistance detection circuit for photovoltaic DC-to-AC converter, it resistance detecting circuit comprising inverter input circuit, be connected with described inverter input circuit, described inverter input circuit comprises PV power supply, booster circuit, it is characterized in that: described booster circuit is parallel with and makes booster circuit short circuit for closing when PV supply voltage is without the need to boosting thus make PV power supply directly load on switch on resistance detecting circuit.
2. the insulation resistance detection circuit for photovoltaic DC-to-AC converter according to claim 1, is characterized in that: described resistance detecting circuit is connected with the BUS voltage as driving source.
3. the insulation resistance detection circuit for photovoltaic DC-to-AC converter according to claim 1, it is characterized in that: described resistance detecting circuit comprises first of series connection and detects resistance, second and detect resistance, the 3rd and detect resistance, be connected to described second and detect resistance and the 3rd and detect voltage monitoring instrument between resistance, the linkage section ground connection of described first testing circuit and the second testing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520337209.7U CN204758699U (en) | 2015-05-22 | 2015-05-22 | A insulating impedance detection circuitry for photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520337209.7U CN204758699U (en) | 2015-05-22 | 2015-05-22 | A insulating impedance detection circuitry for photovoltaic inverter |
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| CN204758699U true CN204758699U (en) | 2015-11-11 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356848A (en) * | 2015-11-17 | 2016-02-24 | 江苏固德威电源科技股份有限公司 | Multipath MPPT input photovoltaic inverter insulation impedance detection device and method |
| CN105938162A (en) * | 2016-06-24 | 2016-09-14 | 广州三晶电气股份有限公司 | Double-path MPPT (maximum power point tracking)-based photovoltaic inverter insulation resistance to earth detection system and method |
| CN107276203A (en) * | 2017-06-20 | 2017-10-20 | 昆明理工大学 | A kind of photovoltaic battery panel low-voltage electric power storage and high-voltage discharge device, its control method and application |
| CN107589303A (en) * | 2016-07-07 | 2018-01-16 | 台达电子工业股份有限公司 | Power supply change-over device and earth impedance value detection method |
| CN109696582A (en) * | 2019-02-26 | 2019-04-30 | 欣旺达电子股份有限公司 | Insulation resistance detection circuit and its detection method |
| CN109725202A (en) * | 2018-12-27 | 2019-05-07 | 科华恒盛股份有限公司 | Multichannel MPPT insulation resistance detection device and method |
| CN111697616A (en) * | 2019-03-12 | 2020-09-22 | Abb瑞士股份有限公司 | Multi-channel inverter for photovoltaic equipment |
| CN112098821A (en) * | 2020-08-14 | 2020-12-18 | 深圳科士达科技股份有限公司 | Photovoltaic inverter booster circuit switch short circuit detection method and photovoltaic power generation device thereof |
| WO2021017687A1 (en) * | 2019-07-26 | 2021-02-04 | 华为技术有限公司 | Insulation impedance detection circuit, and method |
-
2015
- 2015-05-22 CN CN201520337209.7U patent/CN204758699U/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105356848B (en) * | 2015-11-17 | 2018-04-06 | 江苏固德威电源科技股份有限公司 | Multichannel MPPT inputs the insulation resistance detection device and method of photovoltaic DC-to-AC converter |
| CN105356848A (en) * | 2015-11-17 | 2016-02-24 | 江苏固德威电源科技股份有限公司 | Multipath MPPT input photovoltaic inverter insulation impedance detection device and method |
| CN105938162A (en) * | 2016-06-24 | 2016-09-14 | 广州三晶电气股份有限公司 | Double-path MPPT (maximum power point tracking)-based photovoltaic inverter insulation resistance to earth detection system and method |
| CN105938162B (en) * | 2016-06-24 | 2018-07-17 | 广州三晶电气股份有限公司 | Based on two-way MPPT photovoltaic DC-to-AC converter insulation against ground resistance detecting circuits |
| CN107589303A (en) * | 2016-07-07 | 2018-01-16 | 台达电子工业股份有限公司 | Power supply change-over device and earth impedance value detection method |
| CN107276203A (en) * | 2017-06-20 | 2017-10-20 | 昆明理工大学 | A kind of photovoltaic battery panel low-voltage electric power storage and high-voltage discharge device, its control method and application |
| CN109725202B (en) * | 2018-12-27 | 2021-08-03 | 科华数据股份有限公司 | Multi-path MPPT insulation impedance detection device and method |
| CN109725202A (en) * | 2018-12-27 | 2019-05-07 | 科华恒盛股份有限公司 | Multichannel MPPT insulation resistance detection device and method |
| CN109696582A (en) * | 2019-02-26 | 2019-04-30 | 欣旺达电子股份有限公司 | Insulation resistance detection circuit and its detection method |
| CN111697616A (en) * | 2019-03-12 | 2020-09-22 | Abb瑞士股份有限公司 | Multi-channel inverter for photovoltaic equipment |
| WO2021017687A1 (en) * | 2019-07-26 | 2021-02-04 | 华为技术有限公司 | Insulation impedance detection circuit, and method |
| US11500001B2 (en) | 2019-07-26 | 2022-11-15 | Huawei Digital Power Technologies Co., Ltd. | Insulation resistance detection circuit and method |
| CN112098821A (en) * | 2020-08-14 | 2020-12-18 | 深圳科士达科技股份有限公司 | Photovoltaic inverter booster circuit switch short circuit detection method and photovoltaic power generation device thereof |
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| C14 | Grant of patent or utility model | ||
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| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215163 Kunlun high tech Zone, Jiangsu Province, Suzhou City Road, No. 189 Patentee after: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO., LTD. Address before: 215163 Kunlun high tech Zone, Jiangsu Province, Suzhou City Road, No. 189 Patentee before: Jiangsu Goodwe Power Supply Technology Co., Ltd. |
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| CP03 | Change of name, title or address |
Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Patentee after: Goodway Technology Co.,Ltd. Address before: 215163 No. 189 Kunlun mountain road, hi tech Zone, Suzhou, Jiangsu Patentee before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |