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Series fault arc detection circuit

A technology for detecting circuits and fault arcs, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of high cost, high signal frequency, and high circuit complexity, so as to reduce the cost of implementation, the difficulty of implementation, and ensure integrity. , the effect of reducing complexity

Inactive Publication Date: 2015-11-18
GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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Problems solved by technology

Due to the high frequency of the signal, the requirements for the AD conversion module and the control chip are relatively high, and the cost is relatively high
[0008] Therefore, the existing series fault arc detection circuit has high requirements for components, it is difficult for weak signals to pass through in full wave, the circuit complexity is high, and the cost is also high

Method used

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  • Series fault arc detection circuit

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0026] see figure 1 As shown, according to the embodiment of the present invention, the series fault arc detection circuit includes a signal sampling circuit 1, a precision full-wave rectification circuit 2 and a comparison circuit 3, and the signal sampling circuit 1 is used to sample the live wire current and output the first signal; The precision full-wave rectification circuit 2 is connected to the output terminal of the signal sampling circuit 1, rectifies and amplifies the first signal output by the signal sampling circuit 1, and outputs the second signal; the comparison circuit 3 is connected to the precision full-wave rectification circuit 2 The output end is compared with the signal output by the precision full-wave rectification circuit 2, and the comparison result is output....

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Abstract

The invention discloses a series fault arc detection circuit. The circuit comprises a signal sampling circuit (1) which is used for sampling the current of a live line, and outputting a first signal; a precise full-wave rectification circuit (2) which is connected to the output end of the signal sampling circuit (1), and is used for the rectification and amplification of the first signal outputted by the signal sampling circuit (1) and outputting a second signal; and a comparison circuit (3) which is connected to the output end of the precise full-wave rectification circuit (2), and is used for comparing a signal with the signal outputted by the precise full-wave rectification circuit (2) and outputting comparison results. According to the invention, the circuit can reduce the complexity, enables a weak signal to pass a rectification circuit in a full-wave manner, and reduces the implementation cost.

Description

technical field [0001] The invention relates to the technical field of electricity safety protection, in particular to a series fault arc detection circuit. Background technique [0002] The signal processing process of the series fault arc detection circuit is generally as follows: [0003] When detecting an arc fault, the secondary side of the current transformer senses and outputs the corresponding current, and sends the current signal to the signal processing circuit through half-wave or bridge rectification, or raises the output signal to the AD conversion module for processing. [0004] The disadvantages of the current circuit are as follows: [0005] If half-wave rectification is used, only half-period signals are sampled, and the effective signal is halved, resulting in long protection time and easy malfunction. When there is an arc fault on a power load or a purely resistive load, the amplitude of the high-frequency signal is low. Due to the influence of the diode...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 魏学军黄尚麟曹璇
Owner GREE ELECTRIC APPLIANCES INC OF ZHUHAI
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