CN203037745U - Insulation resistance detection circuit of two ways of photovoltaic input - Google Patents
Insulation resistance detection circuit of two ways of photovoltaic input Download PDFInfo
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- CN203037745U CN203037745U CN 201220717480 CN201220717480U CN203037745U CN 203037745 U CN203037745 U CN 203037745U CN 201220717480 CN201220717480 CN 201220717480 CN 201220717480 U CN201220717480 U CN 201220717480U CN 203037745 U CN203037745 U CN 203037745U
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Abstract
The utility model discloses an insulation resistance detection circuit of two ways of photovoltaic input. The insulation resistance detection circuit of two ways of photovoltaic input comprises a first positive electrode and a second positive electrode, wherein the first positive electrode and the second positive electrode are connected in parallel with a negative electrode. The first positive electrode and the negative electrode form a first way of PV input. The second positive electrode and the negative electrode form a second way of PV input. The insulation resistance detection circuit of two ways of photovoltaic input comprises a first switching device which is arranged on the first positive electrode, a second switching device which is arranged on the second positive electrode, a third switching device, a first resistor, a second resistor, a third resistor, a voltage detection device which is connected between the second resistor and the third resistor and is used for detecting the voltage value of the third resistor, and a control device which is used for controlling the turn-off of the first switching device, the second switching device and the third switching device, wherein the third switching device, the first resistor, the second resistor and the third resistor are connected in parallel between the first positive electrode and the negative electrode in turn, and the first resistor and the second resistor are connected with the ground.
Description
Technical field
The insulation impedance testing circuit that has related to a kind of two-way photovoltaic input in the utility model.
Background technology
Along with the universal use of photovoltaic generation power supply, people's attention is more and more received in the security of photovoltaic battery panel.In the parallel network power generation technology, a quality that key index is exactly the insulation degree of photovoltaic combining inverter safety, whether the state of insulation that the insulation impedance measuring technique can be judged current system is good, and the situation of change of state of insulation.Need photovoltaic combining inverter every day to carry out the detection of the insulation against ground resistance of photovoltaic cell before the start, require the insulation against ground resistance of combining inverter to be not less than 1K Ω/V in the TUV authentication.
The insulation impedance of most photovoltaic DC-to-AC converter two-way photovoltaic input detects the coupling owing to two-way insulation against ground impedance, and rarer more accurate method can detect insulation impedance.General all is the determination methods that adopts hypothesis, and the insulation impedance of detection also is a scope, under some conditions, even has blind spot, can only get the protection that direction is done the insulation impedance by impedance variation, and there is potential safety hazard during to the work of inverter in this.
Therefore in grid-connected application, the operating position of the input of two-way PV panel is more and more general, also presses for solution about the method for two-way PV insulation impedance high-precision test.
The utility model content
The utility model provides a kind of insulation impedance testing circuit and detection method of two-way photovoltaic input, and it can detect the insulation impedance value of two-way photovoltaic input accurately.
The utility model discloses a kind of insulation impedance testing circuit of two-way photovoltaic input, it comprises first anodal and second positive pole that is in parallel and arranges with negative pole, the described first anodal and described negative pole constitutes first via PV input, described second positive pole and described negative pole constitute the second road PV input, it is characterized in that: the insulation impedance testing circuit of described two-way photovoltaic input comprises
One is arranged on first switching device on first positive pole;
One is arranged on the second switch device on second positive pole;
Be arranged in parallel the 3rd switching device, first resistance, second resistance, the 3rd resistance between first positive pole and negative pole successively, ground connection between described first resistance and described second resistance, wherein the 3rd switching device is connected with first positive pole, and the 3rd resistance is connected with negative pole;
One voltage check device, it is connected between described second resistance and described the 3rd resistance, in order to detect the magnitude of voltage of described the 3rd resistance;
One control device, it is used for the shutoff of described first switching device of control, described second switch device, described the 3rd switching device.
Preferably, it also comprises the first switch DC booster circuit that is arranged on described first positive pole.
Preferably, it also comprises the second switch DC voltage booster circuit that is arranged on described second positive pole.
Preferably, described control device is the DSP manager.
The utility model adopts above structure, can calculate the insulation impedance of two-way photovoltaic input accurately.
Description of drawings
Accompanying drawing 1 is structural principle synoptic diagram of the present utility model.
Accompanying drawing 2 ought be opened first switching device for the utility model, the equivalent-circuit model figure when disconnecting the second switch device.
Accompanying drawing 3 ought be opened the second switch device, the equivalent-circuit model figure when disconnecting first switching device for the utility model.
In the accompanying drawing: R2, first resistance; R3, second resistance; R4, the 3rd resistance; X1, first insulation impedance; X2, second insulation impedance; X3, the 3rd insulation impedance; PV_1+, first positive pole; PV_2+, second positive pole; PV-, negative pole; DSP, DSP manager; S1, first switching device; S2, second switch device; S3, the 3rd switching device; BOOST_1, the first switch DC booster circuit; BOOST_2, second switch DC voltage booster circuit.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that protection domain of the present utility model is made more explicit defining.
A kind of two-way photovoltaic input circuit, it comprises the first anodal PV_1+ and the second anodal PV_2+ that is in parallel and arranges with negative pole, the described first anodal PV_1+ and described negative pole PV-constitute first via PV input, and the described second anodal PV_2+ and described negative pole PV-constitute the second road PV input.
Certainly exist the first insulation impedance X1 at the first anodal PV_1+; Certainly exist the second insulation impedance X2 at the second anodal PV_2+; Certainly exist the 3rd insulation impedance X3 at negative pole.
Therefore in order to detect this three insulation impedances value, it comprises that one is arranged on the first switching device S1 on the first anodal PV_1+ this testing circuit; One is arranged on the second switch device S2 on the second anodal PV_2+; Be arranged in parallel the 3rd switching device S3, first resistance R 2, second resistance R 3, the 3rd resistance R 4 between the first anodal PV_1+ and negative pole PV-successively, centre-point earth between described first resistance R 2 and described second resistance R 3, first resistance R 2 is mutually direct-connected with the first anodal PV_1+, and the 3rd resistance R 4 is mutually direct-connected with negative pole PV-; One voltage check device, it is connected in the central point between described second resistance R 3 and described the 3rd resistance R 4, in order to detect the magnitude of voltage of described the 3rd resistance R 4; One control device DSP, it is used for the shutoff of the described first switching device S1 of control, described second switch device S2, described the 3rd switching device S3.
Concrete, the first switching device S1, second switch device S2 and the 3rd switching device S3 can be the various elements that can open or turn-off circuit of living in such as relay, switching tube.
When arranging, can successively the 3rd switching device S3, first resistance R 2, second resistance R 3 be arranged in parallel between the first anodal PV_1+ and negative pole PV-.With the centre-point earth of first resistance R 2 and second resistance R 3, voltage check device is arranged between second resistance R 2 and the 3rd resistance R 3 then.
The first anodal PV_1+ and the 3rd switching device S3 can also be contacted mutually, the 3rd switching device S3 and first resistance R 2 ground connection that is in series, the 3rd resistance R 4 is contacted mutually with negative pole PV-, with second resistance R 3 and the 3rd resistance R 4 ground connection that is in series, and voltage check device is arranged between second resistance R 3 and the 3rd resistance R 4.
Above-mentioned two kinds of connected modes from principle say so the equivalence.
Control device is used for the shutoff of the described first switching device S1 of control, described second switch device S2, described the 3rd switching device S3.Voltage check device, it is connected between described second resistance R 3 and described the 3rd resistance R 4, in order to detect the magnitude of voltage of described the 3rd resistance R 4.Preferably, control device can be the DSP manager, and it can calculate the data that obtain from voltage check device.
Preferably, first positive pole is provided with the first switch DC booster circuit BOOST_1, and second positive pole is provided with second switch DC voltage booster circuit BOOST_2.BOOST can stabilize and increase the voltage of input more.
The detection method that this device adopts, it may further comprise the steps:
A) open the described first switching device S1, disconnect described second switch device S2 and described the 3rd switching device S3, detect and obtain the first magnitude of voltage Viso1, obtain
, formula;
B) open the described first switching device S1, disconnect described second switch device S2, open described the 3rd switching device S3, detect and obtain the second magnitude of voltage Viso2, obtain
, formula two;
C) calculate the first insulation impedance value X1 of the first anodal PV_1+ and the 3rd insulation impedance value X3 of negative pole PV-according to the first magnitude of voltage Viso1 and the second magnitude of voltage Viso2, namely by finding the solution formula (), the linear equation in two unknowns that formula (two) is formed, can obtain X1, the resistance of X3;
D) open described second switch device S2, disconnect the described first switching device S1, detect and obtain tertiary voltage value Viso3, obtain
E) according to tertiary voltage value Viso3 and the 3rd insulation impedance value X3, calculate the second insulation impedance value X2 of the second anodal PV_2+, because the 3rd insulation impedance value X3 is known, can obtain linear equation with one unknown, can obtain the resistance of the second insulation impedance value X2.
So just obtained the PV positive pole, the high precision of negative pole insulation impedance over the ground detects, measuring the value of coming and the safety restriction that is stored in the DSP compares, if satisfy standard, inverter can carry out follow-up action, as not satisfying standard, disables inverter work, and trigger warning circuit and send warning.
Meanwhile, the first switching device S1, the switch controlling signal of second switch device S2 can trigger by the electronic switch of outside.When the circuit of needs disconnection PV direct current input and PV inside interrelates, can disconnect the first switching device S1 by triggering the external electrical switch, second switch device S2 is to realize the function of DC-SWITCH.
More than specific embodiment of the present utility model is illustrated in conjunction with diagram, clearly on the basis of not leaving scope and spirit of the present utility model, can much revise prior art and technology.In the technical field, the common knowledge of a GPRS just can be carried out diversified change in technology main idea scope of the present utility model under of the present utility model.
Claims (4)
1. the insulation impedance testing circuit of two-way photovoltaic input, it comprises first anodal and second positive pole that is in parallel and arranges with negative pole, the described first anodal and described negative pole constitutes first via PV input, described second positive pole and described negative pole constitute the second road PV input, it is characterized in that: the insulation impedance testing circuit of described two-way photovoltaic input comprises
One is arranged on first switching device on first positive pole;
One is arranged on the second switch device on second positive pole;
Be arranged in parallel the 3rd switching device, first resistance, second resistance, the 3rd resistance between first positive pole and negative pole successively, ground connection between described first resistance and described second resistance, wherein the 3rd switching device is connected with first positive pole, and the 3rd resistance is connected with negative pole;
One voltage check device, it is connected between described second resistance and described the 3rd resistance, in order to detect the magnitude of voltage of described the 3rd resistance;
One control device, it is used for the shutoff of described first switching device of control, described second switch device, described the 3rd switching device.
2. the insulation impedance testing circuit of two-way photovoltaic according to claim 1 input, it is characterized in that: it also comprises the first switch DC booster circuit that is arranged on described first positive pole.
3. the insulation impedance testing circuit of two-way photovoltaic according to claim 1 input, it is characterized in that: it also comprises the second switch DC voltage booster circuit that is arranged on described second positive pole.
4. the insulation impedance testing circuit of two-way photovoltaic according to claim 1 input, it is characterized in that: described control device is the DSP manager.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717480 CN203037745U (en) | 2012-12-24 | 2012-12-24 | Insulation resistance detection circuit of two ways of photovoltaic input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717480 CN203037745U (en) | 2012-12-24 | 2012-12-24 | Insulation resistance detection circuit of two ways of photovoltaic input |
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| CN203037745U true CN203037745U (en) | 2013-07-03 |
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| CN 201220717480 Expired - Lifetime CN203037745U (en) | 2012-12-24 | 2012-12-24 | Insulation resistance detection circuit of two ways of photovoltaic input |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091560A (en) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | Double line photovoltaic input insulation resistance detection circuit and detection method |
| CN103645383A (en) * | 2013-12-24 | 2014-03-19 | 浙江昱能光伏科技集成有限公司 | Detection circuit for insulation resistors to ground of inverter |
| EP2975720A1 (en) * | 2014-06-30 | 2016-01-20 | Sungrow Power Supply Co., Ltd. | Device and method for detecting insulation of photovoltaic modules against ground and photovoltaic grid-connected power generation system |
| CN106603007A (en) * | 2016-12-16 | 2017-04-26 | 阳光电源股份有限公司 | Photovoltaic array-to-ground insulation impedance detection circuit |
| CN108279331A (en) * | 2018-03-21 | 2018-07-13 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | A kind of photovoltaic DC-to-AC converter insulation resistance detection circuit and method |
| CN115656637A (en) * | 2022-10-24 | 2023-01-31 | 中南大学 | Low-cost photovoltaic panel ground insulation impedance detection circuit and detection method |
-
2012
- 2012-12-24 CN CN 201220717480 patent/CN203037745U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091560A (en) * | 2012-12-24 | 2013-05-08 | 江苏兆伏新能源有限公司 | Double line photovoltaic input insulation resistance detection circuit and detection method |
| CN103645383A (en) * | 2013-12-24 | 2014-03-19 | 浙江昱能光伏科技集成有限公司 | Detection circuit for insulation resistors to ground of inverter |
| CN103645383B (en) * | 2013-12-24 | 2016-05-04 | 浙江昱能科技有限公司 | The testing circuit of the insulation against ground resistance of inverter |
| EP2975720A1 (en) * | 2014-06-30 | 2016-01-20 | Sungrow Power Supply Co., Ltd. | Device and method for detecting insulation of photovoltaic modules against ground and photovoltaic grid-connected power generation system |
| CN106603007A (en) * | 2016-12-16 | 2017-04-26 | 阳光电源股份有限公司 | Photovoltaic array-to-ground insulation impedance detection circuit |
| CN106603007B (en) * | 2016-12-16 | 2018-09-28 | 阳光电源股份有限公司 | Photovoltaic array ground insulation impedance detection circuit |
| CN108279331A (en) * | 2018-03-21 | 2018-07-13 | 艾思玛新能源技术（上海）有限公司苏州高新区分公司 | A kind of photovoltaic DC-to-AC converter insulation resistance detection circuit and method |
| CN108279331B (en) * | 2018-03-21 | 2023-11-10 | 爱士惟科技股份有限公司 | Photovoltaic inverter insulation resistance detection circuit and method |
| CN115656637A (en) * | 2022-10-24 | 2023-01-31 | 中南大学 | Low-cost photovoltaic panel ground insulation impedance detection circuit and detection method |
| CN115656637B (en) * | 2022-10-24 | 2024-03-26 | 中南大学 | Low-cost photovoltaic panel ground insulation resistance detection circuit and detection method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SMA NEW ENERGY TECHNOLOGY (SHANGHAI) AG Free format text: FORMER OWNER: JIANGSU ZOF NEW ENERGY CO., LTD. Effective date: 20150424 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 212200 ZHENJIANG, JIANGSU PROVINCE TO: 200000 PUDONG NEW AREA, SHANGHAI |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150424 Address after: 200000, 7, 701, 707B building, Zhongjian building, No. 1568 Century Avenue, Shanghai, Pudong New Area Patentee after: SMA NEW ENERGY TECHNOLOGY (SHANGHAI) CO.,LTD. Address before: 212200 Yangzhong City, Jiangsu Province Economic Development Zone, Hong Xing Road, No. 588, No. Patentee before: JIANGSU ZOF NEW ENERGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Units 701 and 707B on the 7th floor of Zhongjian Building, 1568 Century Avenue, Pudong New Area, Shanghai 200000 Patentee after: ESWEI NEW ENERGY TECHNOLOGY (SHANGHAI) Co.,Ltd. Address before: Units 701 and 707B on the 7th floor of Zhongjian Building, 1568 Century Avenue, Pudong New Area, Shanghai 200000 Patentee before: SMA NEW ENERGY TECHNOLOGY (SHANGHAI) CO.,LTD. |
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| CP03 | Change of name, title or address | ||
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Address after: 200023 room 904b, 757 Mengzi Road, Huangpu District, Shanghai Patentee after: Asway Power Equipment Trading (Shanghai) Co.,Ltd. Address before: Units 701 and 707B on the 7th floor of Zhongjian Building, 1568 Century Avenue, Pudong New Area, Shanghai 200000 Patentee before: ESWEI NEW ENERGY TECHNOLOGY (SHANGHAI) Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |