Arc detection circuit and detection method thereof

Abstract

The invention belongs to the technical field of electrical protection, and particularly relates to an arc detection circuit and a detection method thereof. The arc detection circuit comprises an electric leakage mutual inductor, and the input end of the electric leakage mutual inductor is connected with the mains supply. The electric leakage mutual inductor converts a leakage current signal into avoltage signal. The arc detection circuit further comprises a control module. The input end of the control module is connected with the output end of the electric leakage mutual inductor. The arc detection method comprises the steps of obtaining a leakage current burr voltage signal; inputting the leakage current glitch voltage signal into an analog comparator, and comparing the leakage current glitch voltage signal with a fixed level to obtain a comparison result; and converting the comparison result into a digital signal, and inputting the digital signal into an interrupt system for detection until an electric leakage arc is detected. According to the invention, ns-level burrs on the leakage current can be detected through a digital-analog hybrid method to judge whether the arc occurs or not; the arc detection circuit and the detection method are suitable for various loads; the detection effect is good; the arc can be well recognized; and the problem of false alarm can be well solved.

Description

technical field [0001] The invention belongs to the technical field of electrical protection, and in particular relates to an arc detection circuit and a detection method thereof. Background technique [0002] In the prior art, the current flat shoulder detection method can detect a single resistive load, but cannot effectively detect the arc that occurs on the branch in the parallel state of multiple resistors (that is, only the arc on the main circuit or only one load can be detected), At the same time, it is impossible to effectively distinguish electrical appliances using rectifier circuits (the normal current waveform has flat shoulders), which is prone to false alarms or false alarms. [0003] Moreover, when identifying the distortion point of the current in arc detection, the hardware requirements are high, and an external memory chip is often required, which cannot distinguish good arcs from bad arcs; in addition, methods such as artificial intelligence, fuzzy contro...

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Problems solved by technology

[0002] In the prior art, the current flat shoulder detection method can detect a single resistive load, but cannot effectively detect the arc that occurs on the branch in the parallel state of multiple resistors (that is, only the arc on the main circuit or only one load can be detected), At the same time, it cannot effectively distinguish electrical appliances using rectifier circuits (the normal current waveform has flat shoulders), which is prone to false alarms or false alarms

[0003] Moreover, when identifying the distortion point of the current in arc detection, the hardware requirements are high, and an external memory chip is often required, which cannot distinguish good arcs from bad arcs; in addition, methods such as artificial intelligence, fuzzy control, and wavelet analysis also have complex operations. Requires a sufficiently complete arc database, which is highly complex and cannot be used in a wide range

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