CN203720267U - Photovoltaic inverter insulation resistor detection circuit - Google Patents
Photovoltaic inverter insulation resistor detection circuit Download PDFInfo
- Publication number
- CN203720267U CN203720267U CN201320885816.8U CN201320885816U CN203720267U CN 203720267 U CN203720267 U CN 203720267U CN 201320885816 U CN201320885816 U CN 201320885816U CN 203720267 U CN203720267 U CN 203720267U
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- CN
- China
- Prior art keywords
- photovoltaic inverter
- insulation resistor
- photovoltaic
- coupling capacitance
- insulation resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009413 insulation Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 title abstract description 12
- 230000008878 coupling Effects 0.000 claims abstract description 26
- 238000010168 coupling process Methods 0.000 claims abstract description 26
- 238000005859 coupling reaction Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 abstract description 6
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
Abstract
The utility model relates to a photovoltaic inverter insulation resistor detection circuit. If coupling capacitance cannot be detected before operation of a photovoltaic inverter, high leakage current is generated in operation, which causes protective shutdown so that the photovoltaic inverter starts repeatedly, and thus the service life of the photovoltaic inverter is influenced. Provided is the photovoltaic inverter insulation resistor detection circuit which comprises a relay K, a detection resistor R, a controllable switch S, an insulation resistor RX1 and an insulation resistor RX 2. The photovoltaic inverter insulation resistor detection circuit is characterized in that the two ends of the insulation resistor RX1 and the insulation resistor RX 2 are respectively connected in parallel with a coupling capacitor CY1 and a coupling capacitor CY2. One end of the coupling capacitor CY1 is connected with anode input PV+, and the other end is grounded. One end of the coupling capacitor CY2 is connected with cathode input PV-, and the other end is grounded. The photovoltaic inverter insulation resistor detection circuit is simple in circuit structure so that a situation that high detection leakage current in starting of the photovoltaic inverter caused by high coupling capacitance is generated, then shutdown is performed and starting is performed again, and detection leakage current is high and shutdown is performed again is avoided.
Description
Technical field
the utility model relates to a kind of circuit and detection method, is specially a kind of photovoltaic DC-to-AC converter insulating resistor detecting circuit.
Background technology
Existing photovoltaic DC-to-AC converter insulating resistor detecting circuit comprises a relay K, one is detected resistance R, a contact of one relay termination K of resistance, the other end shell (the earth) that picks, another contact of relay K meets the anode input PV+ of photovoltaic DC-to-AC converter, and the coil winding of relay K connects control signal.
As shown in Figure 1, the anode input PV+ of photovoltaic DC-to-AC converter, negative electrode input PV-, have an insulation resistance R to the earth respectively
x1, R
x2.Consider for safety, photovoltaic DC-to-AC converter must detect R before operation
x1, R
x2, only have the R of working as
x1, R
x2while being greater than limit value (according to input voltage grade difference, this limit value is also different), photovoltaic DC-to-AC converter could move.
The detection method of existing photovoltaic DC-to-AC converter insulating resistor detecting circuit is as follows:
Photovoltaic DC-to-AC converter input end PV+ is V to the voltage of PV-
in, digitial controller (DSP) detects that casing is V to the voltage of PV-
p1; DSP sends control signal and makes relay K closure, and controller detects that casing is V to the voltage of PV-
p2; DSP does digital operation processing, can accurately calculate R by formula (1), formula (2), formula (3)
x1, R
x2.
(1)
(2)
In formula,
(3)
This insulating resistor detecting circuit is simple, and insulation resistance is detected accurately.Shortcoming is the coupling capacitance of input end to the earth that cannot detect photovoltaic DC-to-AC converter; especially under the larger weather conditions of air humidity; the negative electrode PV-of photovoltaic battery panel is larger to the coupling capacitance of the earth; if photovoltaic DC-to-AC converter can not detect coupling capacitance before operation; in the time of operation, can produce and cause protection shutdown compared with large leakage current; cause photovoltaic DC-to-AC converter repeatedly to start, affect the serviceable life of photovoltaic DC-to-AC converter.
Utility model content
The purpose of this utility model is to provide a kind of photovoltaic DC-to-AC converter insulating resistor detecting circuit and detection method of simple in structure, the input end that can the detect photovoltaic DC-to-AC converter coupling capacitance to the earth.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of photovoltaic DC-to-AC converter insulating resistor detecting circuit, comprises relay K, detects resistance R, controllable switch S, insulation resistance R
x1with insulation resistance R
x2;
Described controllable switch S comprises source electrode and drain electrode, detects a contact of resistance R one relay termination K, the drain electrode of another termination switch S, and the source ground of switch S, another contact of relay K meets the anode input PV+ of photovoltaic DC-to-AC converter; Insulation resistance R
x1one end is connected with anode input PV+, other end ground connection, insulation resistance R
x2one end is connected with negative electrode input PV-, other end ground connection, and its special feature is: described insulation resistance R
x1with insulation resistance R
x2two ends are parallel with respectively coupling capacitance C
y1with coupling capacitance C
y2, described coupling capacitance C
y1one termination anode input PV+, other end ground connection; Described coupling capacitance C
y2one termination negative electrode input PV-, other end ground connection.
Compared with prior art, the utlity model has following beneficial effect: the utility model circuit structure is simple, only increase a switching device, by the frequency control to switch, just can detect faster the input end of photovoltaic DC-to-AC converter to the coupling capacitance of the earth,------shutdown---is restarted the situation generation of---detecting leakage current larger---shutdown again to detect leakage current larger to have avoided the photovoltaic DC-to-AC converter startup causing greatly because of coupling capacitance.
Brief description of the drawings
Fig. 1 is existing photovoltaic DC-to-AC converter insulating resistor detecting circuit schematic diagram;
Fig. 2 is photovoltaic DC-to-AC converter insulating resistor detecting circuit schematic diagram of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in detail.
Referring to Fig. 2, a kind of photovoltaic DC-to-AC converter insulating resistor detecting circuit, comprises relay K, detects resistance R, controllable switch S, insulation resistance R
x1with insulation resistance R
x2; Described controllable switch S comprises source electrode and drain electrode, detects a contact of resistance R one relay termination K, the drain electrode of another termination switch S, the source ground of switch S, another contact of relay K meets the anode input PV+ of photovoltaic DC-to-AC converter, and the coil winding of relay K connects control signal, insulation resistance R
x1one end is connected with anode input PV+, other end ground connection, insulation resistance R
x2one end is connected with negative electrode input PV-, other end ground connection, described insulation resistance R
x1with insulation resistance R
x2two ends are parallel with respectively coupling capacitance C
y1with coupling capacitance C
y2, described coupling capacitance C
y1one termination anode input PV+, other end ground connection; Described coupling capacitance C
y2one termination anode input PV-, other end ground connection.
A detection method for photovoltaic DC-to-AC converter insulating resistor detecting circuit, specifically comprises the following steps:
Step 1: give the cut-off signals that switch S duration is 10-50ms, make coupling capacitance C
y1, C
y2on voltage return to steady-state value, then using dutycycle is 50%, frequency is f
1signal driver switch S, thereby change coupling capacitance C
y1, C
y2discharge and recharge time constant;
Step 2: by gathering casing voltage, sampled point is arranged on to the moment that switch S turns on and off, can obtains capacitor C
y2open moment voltage V at switch
cY2_0and switch turn-offs moment voltage V
cY2_1.According to the charge-discharge characteristic equation of electric capacity, can obtain formula (4), formula (5), formula (6), (7) four equations of formula; With dutycycle be 50%, frequency is f
2signal driver switch S, can obtain capacitor C
y2open moment voltage V at switch
cY2_2and switch turn-offs moment voltage V
cY2_3.Can obtain equally formula (12), formula (13), formula (14), (15) four equations of formula;
Wherein, R
3, R
x2, V
in, V
cY2, t
1, t
2it is all known parameters.Be system of equations by formula (4) with formula (12) simultaneous, can calculate C
y2; By formula (7) and formula (15) simultaneous, can calculate C
y1.
(4)
(5)
(6)
(7)
In formula,
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
Claims (1)
1. a photovoltaic DC-to-AC converter insulating resistor detecting circuit, comprises relay K, detects resistance R, controllable switch S, insulation resistance R
x1with insulation resistance R
x2;
Described controllable switch S comprises source electrode and drain electrode, detects a contact of resistance R one relay termination K, the drain electrode of another termination switch S, and the source ground of switch S, another contact of relay K meets the anode input PV+ of photovoltaic DC-to-AC converter; Insulation resistance R
x1one end is connected with anode input PV+, other end ground connection, insulation resistance R
x2one end is connected with negative electrode input PV-, and other end ground connection, is characterized in that: described insulation resistance R
x1with insulation resistance R
x2two ends are parallel with respectively coupling capacitance C
y1with coupling capacitance C
y2, described coupling capacitance C
y1one termination anode input PV+, other end ground connection; Described coupling capacitance C
y2one termination negative electrode input PV-, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320885816.8U CN203720267U (en) | 2013-12-31 | 2013-12-31 | Photovoltaic inverter insulation resistor detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320885816.8U CN203720267U (en) | 2013-12-31 | 2013-12-31 | Photovoltaic inverter insulation resistor detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203720267U true CN203720267U (en) | 2014-07-16 |
Family
ID=51159408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320885816.8U Expired - Lifetime CN203720267U (en) | 2013-12-31 | 2013-12-31 | Photovoltaic inverter insulation resistor detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203720267U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093590A (en) * | 2016-08-25 | 2016-11-09 | 安徽赛新电源科技有限公司 | Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method |
| CN107110899A (en) * | 2015-02-18 | 2017-08-29 | 艾思玛太阳能技术股份公司 | Photovoltaic system and the device for carrying out determination of insulation resistance on PV generators |
| CN108896824A (en) * | 2018-09-19 | 2018-11-27 | 江苏晶道新能源科技有限公司 | A kind of solar inverter and insulation resistance detection method |
| CN109642884A (en) * | 2016-08-29 | 2019-04-16 | 三菱电机株式会社 | Electrosatatic capacity detector and power conversion device |
| CN110456154A (en) * | 2019-07-26 | 2019-11-15 | 华为技术有限公司 | Insulation resistance detection circuit and method |
| CN110927457A (en) * | 2019-11-08 | 2020-03-27 | 华为技术有限公司 | Inverter and insulation detection circuit |
| CN112924829A (en) * | 2021-02-26 | 2021-06-08 | 科世达(上海)智能设备有限公司 | Insulation detection device |
-
2013
- 2013-12-31 CN CN201320885816.8U patent/CN203720267U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107110899A (en) * | 2015-02-18 | 2017-08-29 | 艾思玛太阳能技术股份公司 | Photovoltaic system and the device for carrying out determination of insulation resistance on PV generators |
| CN106093590A (en) * | 2016-08-25 | 2016-11-09 | 安徽赛新电源科技有限公司 | Photovoltaic combining inverter multichannel input array impedance ground testing circuit and method |
| CN109642884A (en) * | 2016-08-29 | 2019-04-16 | 三菱电机株式会社 | Electrosatatic capacity detector and power conversion device |
| CN109642884B (en) * | 2016-08-29 | 2021-05-28 | 三菱电机株式会社 | Capacitance detection device and power conversion device |
| CN108896824A (en) * | 2018-09-19 | 2018-11-27 | 江苏晶道新能源科技有限公司 | A kind of solar inverter and insulation resistance detection method |
| CN110456154A (en) * | 2019-07-26 | 2019-11-15 | 华为技术有限公司 | Insulation resistance detection circuit and method |
| US11500001B2 (en) | 2019-07-26 | 2022-11-15 | Huawei Digital Power Technologies Co., Ltd. | Insulation resistance detection circuit and method |
| CN110927457A (en) * | 2019-11-08 | 2020-03-27 | 华为技术有限公司 | Inverter and insulation detection circuit |
| CN110927457B (en) * | 2019-11-08 | 2021-04-20 | 华为技术有限公司 | Inverter and insulation detection circuit |
| CN112924829A (en) * | 2021-02-26 | 2021-06-08 | 科世达(上海)智能设备有限公司 | Insulation detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee after: Longteng Semiconductor Co.,Ltd. Address before: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee before: LONTEN SEMICONDUCTOR Co.,Ltd. Address after: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee after: LONTEN SEMICONDUCTOR Co.,Ltd. Address before: 710021 export processing zone, No. twelve, 1 road, Fengcheng, Shaanxi, Xi'an Patentee before: XI'AN LONTEN RENEWABLE ENERGY TECHNOLOGY Inc. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |
|
| CX01 | Expiry of patent term |