CN210323324U - Ground wire connection detector of photovoltaic inverter - Google Patents
Ground wire connection detector of photovoltaic inverter Download PDFInfo
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- CN210323324U CN210323324U CN201920101020.6U CN201920101020U CN210323324U CN 210323324 U CN210323324 U CN 210323324U CN 201920101020 U CN201920101020 U CN 201920101020U CN 210323324 U CN210323324 U CN 210323324U
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- comparator
- ceramic capacitor
- photovoltaic inverter
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- connection detector
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Abstract
A photovoltaic inverter ground wire connection detector relates to the technical field of detection. The utility model provides a photovoltaic inverter ground connection detector it contains fortune and puts, ceramic capacitor, crystal resistor, comparator, reference power module, MCU, FR4 circuit board, fortune is put respectively with ceramic capacitor, crystal resistor and comparator electric connection, comparator and reference power module electric connection, MCU6 and comparator electric connection, fortune is put, ceramic capacitor, crystal resistor and comparator all welded fastening on FR4 circuit board surface. After the technical scheme is adopted, the beneficial effects of the utility model are that: the low-pass filter, sampling comparison and software algorithm processing are integrated, so that the connection sampling of the grounding wire of the inverter is informed to a user in advance, the personal safety is not threatened, and the electric shock hazard is not easy to occur.
Description
Technical Field
The utility model relates to a detect technical field, concretely relates to photovoltaic inverter ground wire connection detector.
Background
At present, the CQC standard is not added to ground wire connection detection in the number of domestic photovoltaic inverters, only the leakage current of the inverters is detected at present, the leakage current detection belongs to passive detection, if the inverters are electrified due to other external reasons, when the inverters are touched, the leakage current is too high, the inverters only can alarm or stop working, users cannot be informed in advance, threat to personal safety is brought, and the inverters are in danger of electric shock.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's defect and not enough, provide a photovoltaic inverter ground wire connection detector, it has integrateed low pass filter, sampling comparison, software algorithm and has handled, makes the dc-to-ac converter ground wire connect the sampling and obtains informing the user in advance, can not lead to the fact the threat to the personal safety, is difficult to take place to electrocute danger.
In order to achieve the above purpose, the utility model adopts the following technical scheme: it contains fortune and puts 1, ceramic capacitor 2, crystal resistor 3, comparator 4, reference power module 5, MCU6, FR4 circuit board 7, fortune is put 1 and ceramic capacitor 2, crystal resistor 3 and 4 electric connection of comparator respectively, comparator 4 and reference power module 5 electric connection, MCU6 and 4 electric connection of comparator, fortune is put 1, ceramic capacitor 2, crystal resistor 3 and comparator 4 and all welded fastening on FR4 circuit board 7 surface.
Four comparators 4 are provided.
The type of the comparator 4 is provided with two types.
The left side of the MCU6 is provided with a ground wire 8.
The comparator 4 is arranged below the MCU 6.
The utility model discloses a theory of operation: the MCU is connected with an output port of the comparator through a plug terminal and a flat cable, the operational amplifier connects a power grid zero line with the inverter shell through a silica gel line, a crystal resistor, a ceramic capacitor and a stud, an output end of the operational amplifier is connected with an input end of the comparator through the ceramic capacitor, the crystal resistor, a reference power supply module is connected with an input end of the comparator, and the operational amplifier, the comparator, the ceramic capacitor, the silica gel line and the crystal resistor are welded on an FR4 circuit board. The operational amplifier sampling circuit carries out differential sampling on the voltage of the inverter shell on a power grid N line, the drain voltage enters the input end of the comparator after attenuation filtering, when the drain voltage exceeds a specified value of 36V, the comparator is delayed through depth, zero potential is output by two-stage filtering and is transmitted to IO of the MCU, and when the MCU detects that an IO port is low level, the grounding line of the inverter is not connected, and the machine has electric leakage.
After the technical scheme is adopted, the utility model discloses beneficial effect does: the low-pass filter, sampling comparison and software algorithm processing are integrated, so that the connection sampling of the grounding wire of the inverter is informed to a user in advance, the personal safety is not threatened, and the electric shock hazard is not easy to occur.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention;
fig. 3 is a topology diagram of the present invention.
Description of reference numerals: the circuit comprises an operational amplifier 1, a ceramic capacitor 2, a crystal resistor 3, a comparator 4, a reference power supply module 5, an MCU6, an FR4 circuit board 7 and a ground wire 8.
Detailed Description
Referring to fig. 1 to fig. 3, the technical solution adopted by the present embodiment is: the power grid zero line inverter is composed of an operational amplifier 1, a ceramic capacitor 2, a crystal resistor 3, a comparator 4, a reference power module 5, an MCU6 and an FR4 circuit board 7, wherein the output end of the operational amplifier 1 is electrically connected with the ceramic capacitor 2, the input end of the crystal resistor 3 is electrically connected with the input end of the comparator 4, the input end of the comparator 4 is electrically connected with the output end of the reference power module 5, the output end of the comparator 4 is electrically connected with the input end of the MCU6, the operational amplifier 1, the ceramic capacitor 2, the crystal resistor 3 and the comparator 4 are fixedly installed on the surface of the FR4 in a welding mode, the MCU6 is connected with the output end of the comparator 4 through a wiring terminal and a flat cable, the operational amplifier 1 is connected with a power grid zero line and an inverter shell through a silica gel line, the crystal resistor 3, the ceramic capacitor 2 and a stud, and the output end of the operational amplifier 1 is electrically.
The comparators 4 are provided with four comparators in total.
The types of the comparators 4 are totally provided with two types, one type is an LM2904 comparator, and the other type is an LM2903 comparator.
The left side of the MCU6 is provided with a ground wire 8.
The comparator 4 is arranged below the MCU 6.
The utility model discloses a theory of operation: the MCU is connected with an output port of the comparator through a plug terminal and a flat cable, the operational amplifier connects a power grid zero line with the inverter shell through a silica gel line, a crystal resistor, a ceramic capacitor and a stud, an output end of the operational amplifier is connected with an input end of the comparator through the ceramic capacitor, the crystal resistor, a reference power supply module is connected with an input end of the comparator, and the operational amplifier, the comparator, the ceramic capacitor, the silica gel line and the crystal resistor are welded on an FR4 circuit board. The operational amplifier sampling circuit carries out differential sampling on the voltage of the inverter shell on a power grid N line, the drain voltage enters the input end of the comparator after attenuation filtering, when the drain voltage exceeds a specified value of 36V, the comparator is delayed through depth, zero potential is output by two-stage filtering and is transmitted to IO of the MCU, and when the MCU detects that an IO port is low level, the grounding line of the inverter is not connected, and the machine has electric leakage.
After the technical scheme is adopted, the utility model discloses beneficial effect does: the low-pass filter, sampling comparison and software algorithm processing are integrated, so that the connection sampling of the grounding wire of the inverter is informed to a user in advance, the personal safety is not threatened, and the electric shock hazard is not easy to occur.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A photovoltaic inverter ground connection detector characterized in that: it contains fortune and puts (1), ceramic capacitor (2), crystal resistor (3), comparator (4), reference power module (5), MCU (6), FR4 circuit board (7), fortune is put (1) respectively with ceramic capacitor (2), crystal resistor (3) and comparator (4) electric connection, comparator (4) and reference power module (5) electric connection, MCU (6) and comparator (4) electric connection, fortune is put (1), ceramic capacitor (2), equal welded fastening in FR4 circuit board (7) surface of crystal resistor (3) and comparator (4).
2. The photovoltaic inverter ground connection detector of claim 1, wherein: four comparators (4) are arranged.
3. The photovoltaic inverter ground connection detector of claim 1, wherein: the type of the comparator (4) is provided with two types.
4. The photovoltaic inverter ground connection detector of claim 1, wherein: and a ground wire (8) is arranged on the left side of the MCU (6).
5. The photovoltaic inverter ground connection detector of claim 1, wherein: the comparator (4) is arranged below the MCU (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920101020.6U CN210323324U (en) | 2019-01-22 | 2019-01-22 | Ground wire connection detector of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920101020.6U CN210323324U (en) | 2019-01-22 | 2019-01-22 | Ground wire connection detector of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210323324U true CN210323324U (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920101020.6U Active CN210323324U (en) | 2019-01-22 | 2019-01-22 | Ground wire connection detector of photovoltaic inverter |
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| Country | Link |
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| CN (1) | CN210323324U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078093A1 (en) * | 2022-10-11 | 2024-04-18 | 华为数字能源技术有限公司 | Casing grounding detection method and inverter |
-
2019
- 2019-01-22 CN CN201920101020.6U patent/CN210323324U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078093A1 (en) * | 2022-10-11 | 2024-04-18 | 华为数字能源技术有限公司 | Casing grounding detection method and inverter |
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