Optical isolation wide voltage range leakage monitoring alarm module

Abstract

The invention discloses an optical isolation wide voltage range leakage monitoring alarm module, which comprises a leakage monitoring module, a resistance acquisition bridge module and an alarm signaloutput module, wherein the leakage monitoring module comprises a first input end P4, a second input end P5 and a neon bulb LED1; the leakage monitoring module is used for being connected with a casing of equipment to be tested; the resistance acquisition bridge module and the leakage monitoring module are oppositely arranged; the resistance acquisition bridge module comprises a resistor R1, a resistor R2, an amplifier U1A, a first power source V1, a photoresistor RG1 and a resistor R8, and is used for detecting the illumination intensity of the neon bulb LED1, thereby acquiring changes of thephotoresistor RG1; the alarm signal output module is connected with the resistance acquisition bridge module; and the alarm signal output module comprises a transistor Q1, a second power source V2, arelay K1 and a voice alarm device, and is used for outputting a leakage alarm signal. The optical isolation wide voltage range leakage monitoring alarm module realizes leakage test of the casing of achassis, and is simple in circuit structure, low in cost and wide in detection range.

Description

technical field [0001] The invention relates to the technical field of electric leakage measurement and control, in particular to an optically isolated wide voltage range electric leakage monitoring and alarm module. Background technique [0002] According to the detection principle, the leakage detection and alarm module is mainly divided into two types: current detection and voltage detection. The current detection principle module generally uses a current mutual induction coil or a Hall element to detect the current flowing to determine whether there is a leakage. It is an isolated detection, but it is necessary to determine the path through which the leakage current flows before the detection can be detected. For the detection of whether the chassis shell is leakage Not very applicable. The voltage detection principle is divided into two methods: voltage transformation and voltage division isolation. The voltage transformation module generally converts high voltage to l...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an optically isolated wide voltage range leakage monitoring and alarm module, which aims to solve the problems of complex circuit, high cost and narrow detection range of the leakage detection and alarm module

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