Onboard short-circuit protection circuit for earth leakage protection plug

Abstract

The utility model discloses an onboard short-circuit protection circuit for a leakage protection plug. The onboard short-circuit protection circuit comprises a protection circuit and a leakage protection circuit, the protection circuit is connected with the leakage protection circuit, and the leakage protection circuit is matched with a live wire and a zero wire; one end of the protection circuit is connected with the live wire, and the other end of the protection circuit is connected with a rectifier bridge in the leakage protection circuit; and the live wire and the zero wire both pass through a mutual inductor in the leakage protection circuit. The protection circuit can directly display the fault of the leakage protection coil, can prompt a user that the leakage protection cannot be used normally when the leakage protection cannot work normally due to the fault of the leakage protection coil, can effectively reduce the fault of the leakage protection coil caused by the use of the leakage protection or other reasons through the prompt of the indicator lamp, and improves the safety of the leakage protection coil. And an electric shock accident caused by the failure of normal operation of the leakage protector is avoided.

Description

Technical Field

[0001] The utility model relates to the field of plugs, in particular to a board-mounted short-circuit protection circuit for a leakage protection plug. Background Art

[0002] At present, most of the mobile household leakage protection plugs in China are electronic leakage protection plugs, that is, leakage protection plugs related to the power supply. When the coil of the leakage protection plug fails, the leakage protection plug cannot work normally, but the leakage protection plug does not have any prompts or displays faults. When the mechanical reset of the leakage protection plug is in the closed state, as long as the leakage protection plug has input, there will be output at the tail, which is very dangerous. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide an on-board short-circuit protection circuit for a leakage protection plug, which can prompt the user that the leakage protection cannot be used normally.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: an onboard short-circuit protection circuit for a leakage protection plug, comprising a protection circuit and a leakage protection circuit;

[0005] The protection circuit is connected to the leakage protection circuit, and the leakage protection circuit cooperates with the live wire and the neutral wire.

[0006] In a preferred embodiment of the present utility model, one end of the protection circuit is connected to the live wire, and the other end is connected to the rectifier bridge in the leakage protection circuit.

[0007] In a preferred embodiment of the present invention, the protection circuit includes an indicator light LED2, a resistor R7 and a leakage protection coil J1, and the indicator light LED2, the resistor R7 and the leakage protection coil J1 are connected in series.

[0008] In a preferred embodiment of the present invention, both the live wire and the neutral wire pass through a mutual inductor in the leakage protection circuit.

[0009] In a preferred embodiment of the present invention, the transformer is a zero-sequence transformer.

[0010] The beneficial effects of the utility model are as follows: the utility model is an on-board short-circuit protection circuit for a leakage protection plug, the protection circuit can directly display the leakage protection coil failure, and can remind the user that the leakage protection cannot be used normally when the leakage protection cannot work normally due to the leakage protection coil failure. Through the prompt of the indicator light, the occurrence of electric shock accidents caused by the leakage protection coil failure caused by the leakage protection during use or other reasons and the leakage protection cannot work normally can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1The present invention is a circuit diagram of an on-board short-circuit protection circuit for a leakage protection plug.

[0012] The markings of the components in the attached drawings are as follows: 1. leakage protection circuit; 2. protection circuit; 3. zero-sequence mutual inductor. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0014] See also Figure 1 A board-mounted short-circuit protection circuit for a leakage protection plug comprises a protection circuit 2 and a leakage protection circuit 1. The protection circuit 2 is connected to the leakage protection circuit 1. The leakage protection circuit 1 cooperates with a live wire and a neutral wire. The protection circuit 2 can directly display the fault of the leakage protection coil J1. When the leakage protection cannot work normally due to the fault of the leakage protection coil J1, the user is prompted that the leakage protection cannot be used normally. Through the prompt of the indicator light LED2, the occurrence of electric shock accidents caused by the failure of the leakage protection coil J1 caused by the leakage protection during use or other reasons and the failure of the leakage protection to work normally can be effectively reduced.

[0015] One end of the protection circuit 2 is connected to the live wire, and the other end is connected to the rectifier bridge in the leakage protection circuit 1. The live wire and the neutral wire both pass through the mutual inductor in the leakage protection circuit 1, and the mutual inductor is a zero-sequence mutual inductor 3. When the live wire and the neutral wire pass through the middle of the zero-sequence mutual inductor 3, the current will generate a magnetic field change through the zero-sequence mutual inductor 3, thereby inducing the magnitude and direction of the zero-sequence current, ensuring that the zero-sequence mutual inductor 3 accurately measures the zero-sequence current in the power grid, thereby timely detecting ground faults, protecting equipment and systems, and improving the safety and stability of the power grid.

[0016] The protection circuit 2 includes an indicator light LED2, a resistor R7 and a leakage protection coil J1, and the indicator light LED2, the resistor R7 and the leakage protection coil J1 are connected in series.

[0017] During operation, when the leakage protection coil J1 works normally, due to the current limiting of the resistor R7, the current passes through the leakage protection coil J1 to supply power to the leakage protection. At this time, the LED1 lights up, indicating that the leakage protection works normally and the user can use it normally.

[0018] When the leakage protection coil J1 fails, current passes through the resistor R7 to supply power to the indicator LED2. At this time, the indicator LED2 lights up, indicating a leakage protection failure, prompting the user not to use the device.

[0019] Compared with the prior art, the utility model provides an on-board short-circuit protection circuit for a leakage protection plug. The protection circuit can directly display the leakage protection coil failure, and can remind the user that the leakage protection cannot be used normally when the leakage protection cannot work normally due to the leakage protection coil failure. Through the prompt of the indicator light, the occurrence of electric shock accidents caused by the leakage protection coil failure caused by the leakage protection during use or other reasons and the leakage protection cannot work normally can be effectively reduced.

[0020] In the description of the present invention, it should be noted that the components are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel in this field through technical manuals or through conventional test methods. The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships described in the accompanying drawings, or are the directions or positional relationships in which the box of the present invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An onboard short-circuit protection circuit for a leakage protection plug, characterized in that: Including protection circuit and leakage protection circuit; The protection circuit is connected to the leakage protection circuit, and the leakage protection circuit cooperates with the live wire and the neutral wire; One end of the protection circuit is connected to the live wire, and the other end is connected to the rectifier bridge in the leakage protection circuit; The live wire and the neutral wire both pass through the mutual inductor in the leakage protection circuit.

2. The onboard short-circuit protection circuit for a leakage protection plug according to claim 1, characterized in that: The protection circuit includes an indicator light LED2, a resistor R7 and a leakage protection coil J1, and the indicator light LED2, the resistor R7 and the leakage protection coil J1 are connected in series.

3. The onboard short-circuit protection circuit for a leakage protection plug according to claim 1, characterized in that: The mutual inductor is a zero-sequence mutual inductor.

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