CN203217042U - Double-channel real-time insulation detection circuit for three-level inverter - Google Patents
Double-channel real-time insulation detection circuit for three-level inverter Download PDFInfo
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- CN203217042U CN203217042U CN 201320149050 CN201320149050U CN203217042U CN 203217042 U CN203217042 U CN 203217042U CN 201320149050 CN201320149050 CN 201320149050 CN 201320149050 U CN201320149050 U CN 201320149050U CN 203217042 U CN203217042 U CN 203217042U
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- level inverter
- testing circuit
- detection circuit
- voltage
- insulation detection
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Abstract
The utility model discloses a double-channel real-time insulation detection circuit for a three-level inverter. The detection circuit comprises an insulation detection circuit board which is provided with a reverse direction driver and four relays; three test points of the insulation detection circuit board are respectively fixed on three direct current bus bars of the three-level inverter; the insulation detection circuit board is provided with an ox horn plug which is connected to a main controller of the three-level inverter through a flat cable; the anode test points whose voltages are PV1 and PV2 are grounded through a resistor string connected in series; and a filter capacitor is connected between the output end of each divider resistor and the test point the voltage of which is PV-. Sampled signals passing through the filter capacitor are transmitted to the main controller of the three-level inverter through the ox horn plug, and the main controller determines whether the three-level inverter accords with an index of an insulating property or not. The double-channel real-time insulation detection circuit for the three-level inverter can achieve safe, simple and real-time insulation detection.
Description
Technical field
The utility model relates to the photovoltaic field, is specifically related to a kind of three-level inverter two-way testing circuit that insulate in real time.
Background technology
In today of new forms of energy photovoltaic industry high speed development, three-level inverter is as the simplest the most practical a kind of circuit again in the multi-electrical level inverter, its major advantage is the forward blocking voltage ability that power device has twice, and can reduce harmonic wave and reduce switching frequency, make the low tension switch device application in high tension transformer.A plurality of photovoltaic modulies link to each other with inverter; inverter need boost to the voltage that cell panel produces; produce high pressure dc-link capacitance is charged, and inverter in actual use, because the complicacy of working environment; the rapid deterioration of temperature and humidity; the reasons such as corrosion of soda acid gas, infringement and the destruction that all can cause insulation make the decreasing insulating of inverter; other people personal safety of crisis, the detection technique that therefore insulate is an important indicator of photovoltaic DC-to-AC converter authentication.But existing insulation detection technique mostly is the manual detection method, can't realize safe and simple real-time detection.
The utility model content
Technical problem to be solved in the utility model is the problem that the insulation detection technique of solution three-level inverter can't realize safe and simple real-time detection.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts provides a kind of three-level inverter two-way testing circuit that insulate in real time, comprise insulation testing circuit plate, described insulation testing circuit plate is provided with reverse driven and four relays, three test points of described insulation testing circuit plate are separately fixed on three DC master rows of three-level inverter, voltage on three DC master rows is respectively PV1, PV2 and PV-, described insulation testing circuit plate is provided with the ox horn plug that is connected by winding displacement with the master controller of described three-level inverter, described ox horn plug is connected with reverse driven, the other end of described reverse driven is connected with described relay respectively, described reverse driven is transformed into low level signal with high level signal and controls the closure of described relay, described voltage is PV1, the anodal test point of PV2 is connected with ground by the resistance string of series connection respectively, be connected to the test point that voltage is PV-through resistance string and divider resistance more afterwards, described voltage is to be connected to two divider resistances on the test point of PV-, described relay lays respectively between resistance string and the divider resistance and between anodal test point and the resistance string, the output terminal of described divider resistance and voltage are also to be connected to a filter capacitor respectively between the test point of PV-, flow to the master controller of three-level inverter through the sampled signal behind the described filter capacitor by described ox horn plug, and judge whether to meet the insulating property index by described master controller.
In above-mentioned three-level inverter two-way insulated testing circuit in real time, the end of described DC master row upwards vertically was bent to form kink, and described insulation testing circuit plate spiral shell is contained on the described kink and perpendicular to the master control board of three-level inverter.
The utility model provide the insulation testing circuit can detect the insulating property of inverter automatically in real time, substitute traditional manual detection method, mainly be that the insulation testing circuit is made a little circuit board separately, one end of DC master row is made the upwards shape of bending, circuit board is fixed on the PV DC master row, and be connected with the master control board of three-level inverter by winding displacement, the benefit of doing like this is the I﹠M that makes things convenient for complete machine, master control board communicate to connect the mobility that has increased circuit, and the insulating property of the anodal negative pole insulation of the section of declaring respectively.
Description of drawings
The structural representation of the three-level inverter that Fig. 1 provides for the utility model;
The synoptic diagram that Fig. 2 is connected with copper bar for insulation testing circuit plate;
Fig. 3 is the circuit block diagram of insulation testing circuit plate.
Embodiment
Below in conjunction with accompanying drawing the utility model is made detailed explanation.
Fig. 1 is the structured flowchart of three-level inverter, and three-level inverter is made up of the EMC plate of right-hand master control board plate and left, middle connect by copper bar, i.e. and three DC master rows, and lay respectively on J1, J3 and the J4 tie point.
As shown in Figure 2, the three-level inverter two-way that the utility model the provides testing circuit that insulate in real time comprises insulation testing circuit plate, insulation testing circuit plate is provided with reverse driven and four relays, three test points of insulation testing circuit plate are separately fixed on three DC master rows of three-level inverter, voltage on three DC master rows is respectively PV1, PV-and PV2, the end of DC master row upwards vertically is bent to form kink, and insulation testing circuit plate spiral shell is contained on the kink and perpendicular to the master control board of three-level inverter.Also leave ground hole on the insulation testing circuit plate.
Insulation testing circuit plate is provided with the ox horn plug that is connected by winding displacement with the master controller of three-level inverter, and the ox horn plug is connected with reverse driven.
As shown in Figure 3, the other end of reverse driven is connected with relay respectively, reverse driven is transformed into high level signal the closure of low level signal and pilot relay, voltage is respectively PV1, two anodal test points of PV2 are respectively by resistance string 2,4 are connected with ground, pass through resistance string 1 afterwards again, 3 and with divider resistance 1,2 are connected to the test point that voltage is PV-, voltage is to be connected to two divider resistances 1 on the test point of PV-, 2, relay 1,2 lay respectively at resistance string 1,3 and divider resistance 1, between 2, relay 3,4 lay respectively at anodal test point and resistance string 2, between 4.Also connect a filter capacitor respectively between the test point that divider resistance 1,2 output terminal and voltage are PV-, sampled signal behind the process filter capacitor directly flows to the master controller of three-level inverter by the ox horn plug, and judges whether to meet the insulating property index by master controller.
Insulate the in real time detection method of testing circuit of three-level inverter two-way is as follows:
When three-level inverter works on power, relay closes on the insulation testing circuit plate, if the positive pole of three-level inverter and negative pole do not have short-circuit conditions over the ground, the reference signal that then to export a sample voltage value be V, it is normal that master controller thinks that insulation detects, and disconnects relay;
If the positive pole of three-level inverter is short circuit for a certain reason over the ground, the voltage sample value of output will be greater than V, and master controller will be shut down by three-level inverter and the newspaper positive pole insulate bad;
If the negative pole of three-level inverter is short circuit for a certain reason over the ground, the voltage sample value of output will be less than V, and master controller will be shut down by three-level inverter and the newspaper negative pole insulate bad.
The utility model provide the insulation testing circuit can detect the insulating property of inverter automatically in real time, substitute traditional manual detection method, mainly be that the insulation testing circuit is made a little circuit board separately, one end of DC master row is made the upwards shape of bending, circuit board is fixed on the PV DC master row, and be connected with the master control board of three-level inverter by winding displacement, the benefit of doing like this is the I﹠M that makes things convenient for complete machine, master control board communicate to connect the mobility that has increased circuit, and the insulating property of the anodal negative pole insulation of the section of declaring respectively.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection domain of the present utility model.
Claims (2)
1. the three-level inverter two-way testing circuit that insulate in real time, it is characterized in that, comprise insulation testing circuit plate, described insulation testing circuit plate is provided with reverse driven and four relays, three test points of described insulation testing circuit plate are separately fixed on three DC master rows of three-level inverter, voltage on three DC master rows is respectively PV1, PV2 and PV-, described insulation testing circuit plate is provided with the ox horn plug that is connected by winding displacement with the master controller of described three-level inverter, described ox horn plug is connected with reverse driven, the other end of described reverse driven is connected with described relay respectively, described reverse driven is transformed into low level signal with high level signal and controls the closure of described relay, described voltage is PV1, the anodal test point of PV2 is connected with ground by the resistance string of series connection respectively, be connected to the test point that voltage is PV-through resistance string and divider resistance more afterwards, described voltage is to be connected to two divider resistances on the test point of PV-, described relay lays respectively between resistance string and the divider resistance and between anodal test point and the resistance string, the output terminal of described divider resistance and voltage are also to be connected to a filter capacitor respectively between the test point of PV-, flow to the master controller of three-level inverter through the sampled signal behind the described filter capacitor by described ox horn plug, and judge whether to meet the insulating property index by described master controller.
2. the three-level inverter two-way as claimed in claim 1 testing circuit that insulate in real time, it is characterized in that, the end of described DC master row upwards vertically is bent to form kink, and described insulation testing circuit plate spiral shell is contained on the described kink and perpendicular to the master control board of three-level inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320149050 CN203217042U (en) | 2013-03-28 | 2013-03-28 | Double-channel real-time insulation detection circuit for three-level inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320149050 CN203217042U (en) | 2013-03-28 | 2013-03-28 | Double-channel real-time insulation detection circuit for three-level inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203217042U true CN203217042U (en) | 2013-09-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320149050 Expired - Fee Related CN203217042U (en) | 2013-03-28 | 2013-03-28 | Double-channel real-time insulation detection circuit for three-level inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203217042U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076261A (en) * | 2013-03-28 | 2014-10-01 | 北京格林科电技术有限公司 | Double-channel real-time insulation detection circuit for three-level inverter and detection method thereof |
| CN105742278A (en) * | 2014-12-25 | 2016-07-06 | 富士电机株式会社 | Semiconductor device |
-
2013
- 2013-03-28 CN CN 201320149050 patent/CN203217042U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076261A (en) * | 2013-03-28 | 2014-10-01 | 北京格林科电技术有限公司 | Double-channel real-time insulation detection circuit for three-level inverter and detection method thereof |
| CN105742278A (en) * | 2014-12-25 | 2016-07-06 | 富士电机株式会社 | Semiconductor device |
| CN105742278B (en) * | 2014-12-25 | 2020-01-07 | 富士电机株式会社 | Semiconductor device with a plurality of semiconductor chips |
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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: 20130925 Termination date: 20160328 |