CN219065556U - AFCI current sampling device and AFCI system of photovoltaic inverter - Google Patents
AFCI current sampling device and AFCI system of photovoltaic inverter Download PDFInfo
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- CN219065556U CN219065556U CN202223382855.4U CN202223382855U CN219065556U CN 219065556 U CN219065556 U CN 219065556U CN 202223382855 U CN202223382855 U CN 202223382855U CN 219065556 U CN219065556 U CN 219065556U
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- current sampling
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Abstract
The utility model discloses an AFCI current sampling device and an AFCI system of a photovoltaic inverter, wherein the AFCI current sampling device comprises a current sampling sensor, and further comprises a lightning protection circuit board, wherein the lightning protection circuit board is provided with a direct current positive input terminal connected with the positive electrode of a direct current input end of the photovoltaic inverter; the current sampling sensor is arranged on the lightning protection circuit board and is electrically connected with the direct current positive electrode input terminal. The AFCI current sampling device of the photovoltaic inverter has the advantages of simple circuit structure and lower cost, and improves the working efficiency of assembly of a production line.
Description
Technical Field
The utility model belongs to the field of photovoltaic inverters, and particularly relates to an AFCI current sampling device and an AFCI system.
Background
AFCI (Arc-Fault Circuit-Interrupter). The protection device is used for disconnecting the power supply circuit before the arc fault develops into a fire or the circuit is short-circuited by identifying the arc fault characteristic signal in the circuit. The AFCI is used as a circuit protection device, has the main function of preventing a fault arc from causing a fire disaster, and can effectively detect the loose contact failure of a direct current loop screw. Meanwhile, the device has the capability of detecting and distinguishing normal arc and fault arc generated when the inverter is started or stopped or switched, and the circuit is cut off in time after the fault arc is found.
The fire accident factors in the photovoltaic power station are many, more than 80% of the fire accidents in the photovoltaic power station are caused by faults on the direct current side, and straight arc discharge is the main reason. The temperature of the contact part is rapidly increased due to linear arc discharge, and a fire disaster is easily caused, and the photovoltaic system cannot be directly extinguished by water after the fire disaster occurs, so that the demand for newly adding an AFCI function to the photovoltaic inverter is gradually increased in recent years, and the current sensor without the AFCI is additionally increased. However, the existing mass production scheme has no space for adding the current sensor, and even if the current sampling sensor 1 'is added to the cable 4' according to the installation mode shown in fig. 1, the existing mass production scheme has the problems of inconvenient installation and fixation, complex wiring of the sampling signal, high cost and the like.
Disclosure of Invention
In order to solve the technical problems, the utility model provides the AFCI current sampling device and the AFCI system of the photovoltaic inverter, which have the advantages of simpler and more compact circuit structure and lower cost, and improve the working efficiency of assembly of a production line.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an AFCI current sampling device of a photovoltaic inverter comprises a current sampling sensor, and further comprises a lightning protection circuit board, wherein the lightning protection circuit board is provided with a direct current positive electrode input terminal connected with a direct current input end positive electrode of the photovoltaic inverter; the current sampling sensor is arranged on the lightning protection circuit board and is electrically connected with the direct current positive electrode input terminal.
Preferably, the AFCI current sampling device further includes an AFCI sampling current output interface, the output end of the current sampling sensor is electrically connected with the AFCI sampling current output interface, and the AFCI sampling current output interface is disposed on the lightning protection circuit board.
More preferably, the AFCI sampling current output interface is electrically connected to an AFCI module of the photovoltaic inverter.
Preferably, the AFCI module is disposed on a power control circuit board of the photovoltaic inverter.
Preferably, the lightning protection circuit board is provided with a plurality of direct current positive electrode input terminals, and each direct current positive electrode input terminal is electrically connected with one current sampling sensor respectively.
More preferably, the lightning protection circuit board is provided with two paths of direct current positive electrode input terminals, and each direct current positive electrode input terminal is electrically connected with one current sampling sensor respectively.
Preferably, the lightning protection circuit board further has a dc negative input terminal connected to a dc input negative of the photovoltaic inverter.
Preferably, the lightning protection circuit board further has a ground terminal. The ground terminal is used for a ground wire, and the ground is a protective measure taken for preventing electric or electronic equipment from being struck by lightning.
Preferably, the lightning protection circuit board is provided with a surge protector. The surge protector is an indispensable device in the lightning protection of electronic equipment, and has the function of limiting the instantaneous overvoltage of a power line and a signal transmission line to the voltage range which can be born by equipment or a system, or discharging strong lightning current into the ground to prevent the protected equipment or the system from being impacted.
The utility model also adopts the following technical scheme:
an AFCI system of a photovoltaic inverter comprises the AFCI current sampling device.
Preferably, the AFCI sampling current output interface of the lightning protection circuit board and the power control circuit board of the photovoltaic inverter are electrically connected through a cable.
Compared with the prior art, the utility model has the following advantages:
according to the AFCI current sampling device of the photovoltaic inverter, the current sampling sensor is directly arranged on the lightning protection circuit board, and the current sampling sensor is electrically connected with the direct current positive electrode input terminal on the lightning protection circuit board, so that the circuit structure is more concise and compact, the circuit space is saved, the production cost is reduced, and the working efficiency of assembly of a production line is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an AFCI current sampling device of a current photovoltaic inverter;
FIG. 2 is a schematic diagram of an AFCI current sampling device for a photovoltaic inverter according to an embodiment of the utility model;
fig. 3 is a schematic diagram of a partial structure of an AFCI current sampling apparatus of a photovoltaic inverter according to an embodiment of the present utility model.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
1', a current sampling sensor; 4', a cable;
100. a photovoltaic inverter; 101. a power control circuit board; 102. an AFCI module; 103. a DC input terminal positive electrode; 104. a DC input terminal negative electrode;
1. a current sampling sensor; 11. an output end;
2. a lightning protection circuit board; 21. a direct current positive electrode input terminal; 22. a DC negative input terminal; 23. a ground terminal;
3. an AFCI sampling current output interface;
4. a cable.
Detailed Description
Preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 2, an AFCI current sampling device of a photovoltaic inverter of the present embodiment includes a current sampling sensor 1 and a lightning protection circuit board 2, wherein the current sampling sensor 1 is disposed on the lightning protection circuit board 2.
Further, the lightning protection circuit board 2 has a direct current positive input terminal 21 and a direct current negative input terminal 22. The dc positive input terminal 21 is connected to the positive electrode of the dc input terminal 103 of the photovoltaic inverter, and the current sampling sensor 1 is electrically connected to the dc positive input terminal 21.
Further, the lightning protection circuit board 2 has multiple dc positive input terminals 21, and in this embodiment, the lightning protection circuit board 2 has two dc positive input terminals 21, and each dc positive input terminal 21 is electrically connected to one current sampling sensor 1. The photovoltaic inverter has two input ports, and each direct current positive input terminal 21 of the lightning protection circuit board 2 is respectively connected with a direct current input positive electrode 103 of the photovoltaic inverter, and each direct current negative input terminal 22 of the lightning protection circuit board 2 is respectively connected with a direct current input negative electrode 104 of the photovoltaic inverter. More specifically, the dc positive input terminal 21 and the dc input section positive electrode 103 are electrically connected by the cable 4, and the dc negative input terminal 22 and the dc input section negative electrode 104 are electrically connected by the cable 4.
The AFCI current sampling device further comprises an AFCI sampling current output interface 3, an output end 11 of the current sampling sensor is electrically connected with the AFCI sampling current output interface 3, and the AFCI sampling current output interface 3 is arranged on the lightning protection circuit board 2.
Further, referring to fig. 3, AFCI sampling current output interface 3 is electrically connected to AFCI module 102 of the photovoltaic inverter. Wherein the AFCI module 102 is disposed on the power control circuit board 101 of the photovoltaic inverter.
The lightning protection circuit board 2 also has a ground terminal 23, the ground terminal 23 being used for a ground wire, the ground being a protective measure taken in order to prevent lightning strikes on equipment such as electric or electronic equipment. Meanwhile, the grounding is also an effective means for protecting personal safety, when a phase line (such as poor insulation of an electric wire, ageing of a circuit and the like) and a shell of the equipment are contacted due to a certain reason, dangerous voltage is generated on the shell of the equipment, and fault current generated by the dangerous voltage flows through the ground wire to the ground, so that the protection effect is achieved.
The lightning protection circuit board 2 is provided with a surge protector (not shown in the figure), which is an indispensable device for lightning protection of electronic equipment, and is suitable for requirements of surge protection in the family residence, third industry and industrial fields. When a peak current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the surge protector can conduct shunt in a very short time, so that damage of the surge to other equipment in the loop is avoided.
The embodiment also provides an AFCI system of a photovoltaic inverter, which comprises the AFCI current sampling device.
Referring to fig. 3, an AFCI sampling current output interface 3 of the lightning protection circuit board and a power control circuit board 101 of the photovoltaic inverter are electrically connected by a cable 4. Specifically, AFCI sampling current output interface 3 and AFCI module 102 on power control circuit board 101 are electrically connected by cable 4.
The photovoltaic power generation system is easy to cause direct current arc faults due to cable aging, unreliable connection of connecting terminals and the like. In order to avoid electrical fire caused by direct current arc faults of the photovoltaic power generation system, an AFCI module for detecting the direct current arc is arranged in the photovoltaic inverter, and the AFCI module comprises a detection circuit for detecting whether the direct current arc exists in the photovoltaic power generation system and a self-checking circuit for testing whether the detection circuit is normal in function. AFCI is a protection device that opens a power circuit before an arc fault develops into a fire or the circuit becomes shorted by identifying an arc fault signature in the circuit.
The lightning protection circuit board 2 of this embodiment has two paths of direct current positive electrode input terminals 21, each direct current positive electrode input terminal 21 is correspondingly and electrically connected with one current sampling sensor 1, the direct current positive electrode 103 of the photovoltaic inverter is connected with the direct current positive electrode input terminal 21, after the current passes through the current sampling sensor 1, the power supply sampling signals of the two paths of current sensors 1 are uniformly connected to the power control circuit board 101 of the photovoltaic inverter through the AFCI sampling current output interface 3 and are electrically connected with the AFCI module 102 on the power control board 101.
The current sampling sensor 1 is integrated on the lightning protection circuit board 2 in the embodiment, and the current sampling sensor 1 does not need additional fixed installation. The direct current positive electrode input terminal 21 on the lightning protection circuit board 2 is electrically connected with the current sampling sensor 1, so that the circuit structure is simpler and more compact, the cost is reduced, and the working efficiency of assembly of the production line is improved.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present utility model are merely with respect to the mutual positional relationship of the constituent elements of the present utility model in the drawings.
The above-described embodiments are provided for illustrating the technical concept and features of the present utility model, and are intended to be preferred embodiments for those skilled in the art to understand the present utility model and implement the same according to the present utility model, not to limit the scope of the present utility model. All equivalent changes or modifications made according to the principles of the present utility model should be construed to be included within the scope of the present utility model.
Claims (10)
1. The AFCI current sampling device of the photovoltaic inverter comprises a current sampling sensor and is characterized by further comprising a lightning protection circuit board, wherein the lightning protection circuit board is provided with a direct current positive electrode input terminal connected with the direct current input end positive electrode of the photovoltaic inverter; the current sampling sensor is arranged on the lightning protection circuit board and is electrically connected with the direct current positive electrode input terminal.
2. The AFCI current sampling apparatus of claim 1, further comprising an AFCI sampling current output interface, wherein the output of the current sampling sensor is electrically connected to the AFCI sampling current output interface, wherein the AFCI sampling current output interface is disposed on the lightning protection circuit board.
3. The AFCI current sampling apparatus of claim 2, wherein the AFCI sampling current output interface is electrically connected to an AFCI module of the photovoltaic inverter.
4. The AFCI current sampling apparatus of claim 3, wherein the AFCI module is disposed on a power control circuit board of the photovoltaic inverter.
5. The AFCI current sampling apparatus of claim 1 wherein the lightning protection circuit board has a plurality of the dc positive input terminals, each of the dc positive input terminals being electrically connected to a respective one of the current sampling sensors.
6. The AFCI current sampling device of claim 1, wherein the lightning protection circuit board further has a dc negative input terminal connected to a dc input negative of the photovoltaic inverter.
7. The AFCI current sampling apparatus of claim 6, wherein the lightning protection circuit board further has a ground terminal.
8. The AFCI current sampling device of claim 6, wherein the lightning protection circuit board is provided with a surge protector.
9. An AFCI system for a photovoltaic inverter comprising an AFCI current sampling device according to any one of claims 1 to 8.
10. The AFCI system of the photovoltaic inverter of claim 9, wherein the AFCI sampling current output interface of the lightning protection circuit board and the power control circuit board of the photovoltaic inverter are electrically connected by a cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223382855.4U CN219065556U (en) | 2022-12-16 | 2022-12-16 | AFCI current sampling device and AFCI system of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223382855.4U CN219065556U (en) | 2022-12-16 | 2022-12-16 | AFCI current sampling device and AFCI system of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219065556U true CN219065556U (en) | 2023-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223382855.4U Active CN219065556U (en) | 2022-12-16 | 2022-12-16 | AFCI current sampling device and AFCI system of photovoltaic inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219065556U (en) |
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2022
- 2022-12-16 CN CN202223382855.4U patent/CN219065556U/en active Active
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