Intelligent three-pole earth leakage protection plug circuit

Abstract

The invention provides an intelligent three-pole earth leakage protection plug circuit. A single-chip microcomputer control circuit and a voltage-stabilized power supply circuit are electrically connected with an under-voltage detection circuit, an electric leakage detection circuit, an analog electric leakage signal circuit, a key circuit, an LED indicator light circuit and an over-temperature detection circuit. A relay switch circuit, a ground wire live detection circuit and the voltage-stabilized power supply circuit are electrically connected with the single-chip microcomputer control circuit. The ground wire live detection circuit, the under-voltage detection circuit, the voltage-stabilized power supply circuit and one end of the relay switch circuit are electrically connected with aninput end. The electric leakage detection circuit and the other end of the relay switch circuit are electrically connected with an output end. The electric leakage detection circuit is electrically connected with the analog electric leakage signal circuit. According to the intelligent three-pole earth leakage protection plug circuit provided by the invention, the problem of relatively large potential safety hazards caused by lack of functions of automatically detecting self circuit faults and prompting tripping protection caused by various faults through an LED indicator light in plugs in prior art is solved.

Description

technical field [0001] The invention relates to the technical field of electricity safety protection devices, in particular to an intelligent three-pole leakage protection plug circuit. Background technique [0002] At present, most of the electrical equipment on the market is equipped with a leakage protection plug device to protect against leakage and avoid electric shock accidents caused by human body contact with leakage parts. However, it has been found in practice that most of the current leakage protection plugs on the market do not detect ground wire live protection, detect voltage low and over tripping protection, power failure or phase loss automatic tripping protection, and automatically detect their own circuit faults and indicate through LEDs. The light prompts functions such as tripping protection caused by various faults, which may easily bring greater safety hazards and cannot play a role in safety protection. [0003] Therefore, it is necessary to provide a...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide an intelligent three-pole leakage protection plug circuit, which solves the current leakage protection plug due to the lack of detection of ground wire live protection, low detection voltage tripping protection, power failure or phase loss automatic tripping Protection and automatic detection of its own circuit faults and through LED indicators to prompt various faults caused by tripping protection and other functions that bring greater safety hazards, it can monitor in real time under normal working conditions due to various leakage or circuit abnormalities. In case of an abnormality, it will immediately trip and disconnect the output, and the cause of the abnormality will be prompted through the LED indicator to provide effective safety protection

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