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Electric arc fault protection circuit

A technology for protecting circuits and arc faults, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices for automatic disconnection, etc., and can solve problems such as economic losses for users, fire hazards, and poor reliability of electrical connections

Inactive Publication Date: 2007-01-03
上海裕生企业发展有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Electronic and electrical equipment is directly connected to the power supply through a pair of wires, which constitutes a series of potential dangers, especially the poor reliability of the electrical connection of some electrical equipment or the corrosion and aging of the connecting device, which makes the poor contact of the electrical connection, and it is very easy to cause a fault in the connection. If it goes on like this, it will cause damage to the line or wiring device, and in serious cases, it will cause fire danger, which will bring huge economic losses to users.
[0003] The current plugs do not have the function of arc fault protection, and there is a hidden danger of arc fault fire

Method used

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Embodiment Construction

[0018] like figure 1 , 2 As shown, an arc fault protection circuit includes,

[0019] The arc signal detection circuit, which is connected to the three-phase AC power supply, is used to induce the composite voltage signal of normal voltage and arc, and filter out the signal of 60HZ and below frequency;

[0020] Rectification and filtering circuit, which is connected with the three-phase AC power supply and the arc signal detection circuit, used to rectify and filter the three-phase AC power supply to provide low-voltage power supply, and rectify and filter the high-frequency arc signal output by the arc signal detection circuit;

[0021] A signal comparison circuit, which is connected to the rectification and filtering circuit, receives the rectified and filtered arc signal and performs amplification and comparison processing. When the amplitude of the arc component reaches a certain set value, and the continuous arcing time exceeds the specified time, output a trigger level...

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Abstract

Said invention provides an electric arc fault protection circuit. It contains electric arc signal detection circuit connected to three-phase alternating-current supply, used for sensing out normal voltage and arc composite voltage alarm, filtering off frequency lower than 60 Hz; rectifying filter circuit connected with three-phase alternating-current supply and electric arc signal detection circuit; signal comparing circuit connected with said rectifying filter circuit; on / off control circuit connected with said signal comparing circuit used for receiving said signal comparing circuit output triggering level and disconnecting fault circuit for eliminating fire hazard and reducing loss.

Description

technical field [0001] The invention belongs to the field of electric fire safety protection for electronic and electrical equipment, and in particular relates to an arc fault safety protection device. Background technique [0002] A typical power supply method for conventional electrical equipment is to use an AC power supply, through a pair of wires and a socket, so that the electronic and electrical equipment or loads receive power. Electronic and electrical equipment is directly connected to the power supply through a pair of wires, which constitutes a series of potential dangers, especially the poor reliability of the electrical connection of some electrical equipment or the corrosion and aging of the connecting device, which makes the poor contact of the electrical connection, and it is very easy to cause a fault in the connection. If this happens, it will cause damage to the line or wiring device, and in severe cases, it will cause fire hazard, which will bring huge e...

Claims

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Application Information

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IPC IPC(8): H02H3/32H01H83/14
Inventor 倪思礼
Owner 上海裕生企业发展有限公司
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