Control circuit of electric leakage protection device
A technology of leakage protection device and control circuit, applied in emergency protection circuit device, circuit device, emergency protection device with automatic disconnection, etc., can solve problems such as complex structure and achieve the effect of reducing heat generation
Inactive Publication Date: 2016-12-14
中山市拓昊电器有限公司
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Problems solved by technology
[0002] The existing control circuit of the leakage protection switch has a complex structure and needs to be improved
Method used
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[0017] The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:
[0018] Such as Figure 1-5 As shown, a control circuit of a leakage protection device includes an AC input interface 1 connected in sequence for the connection of the neutral and live wires, a resettable disconnection relay switch 2, and an AC output interface 3 for the output of the neutral and live wires, A zero-sequence current transformer module 4 is provided on the zero live line between the relay switch 2 and the AC output interface 3 for leakage current detection and outputs a trip control signal when the leakage current exceeds a preset value. The circuit also includes a relay coil 5 corresponding to the relay switch 2, and an AC / DC converter connected in parallel to the AC input interface 1 for supplying power to the relay...
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The invention discloses a control circuit of an electric leakage protection device. The control circuit comprises an AC input interface, a relay switch and an AC output interface which are sequentially connected, wherein the AC input interface is used for accessing a null line and a live line, the relay switch can be reset and disconnected, the AC output interface is used for the null line and the live line to output, a zero sequence current transformer module is arranged on the null line and the live line between the relay switch and the AC output interface and is used for detecting a leakage current and outputting a trip control signal when the detected leakage current exceeds a preset value, the control circuit also comprises a relay coil and an AC / DC conversion module, the relay coil is in correspondence to the relay switch, the AC / DC conversion module is connected in parallel with the AC input interface and is used for supplying power in parallel to the relay coil and the zero sequence current transformer module, an output end of the AC / DC conversion module is further connected in parallel with a controlled shunting module, and a control signal input end of the controlled shunting module is connected with a trip control signal output end of the zero sequence current transformer module. The control circuit disclosed by the scheme is simple and easy to implement and has high practicability.
Description
[technical field] [0001] The invention relates to a control circuit of a leakage protection device. [Background technique] [0002] The existing control circuit of the leakage protection switch has a complicated structure and needs to be improved. [Content of the invention] [0003] The invention overcomes the disadvantages of the above-mentioned technologies, and provides a control circuit of an electric leakage protection device, which has a simple structure, is easy to realize, and has good practicability. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] A control circuit of a leakage protection device, comprising an alternating current input interface 1 connected in sequence for connecting a neutral and live wire, a relay switch 2 that can be reset and disconnected, and an alternating current output interface 3 for outputting a neutral and live wire, the A zero-sequence current transformer module 4 is prov...
Claims
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IPC IPC(8): H02H3/32
CPCH02H3/32
Inventor 曾昭立郭兰旺黄远媚
Owner 中山市拓昊电器有限公司