Ground-wire-missing alarming protective circuit for voltage stabilizer

Abstract

The invention relates to a ground-wire-missing alarming protective circuit for a voltage stabilizer. A ground wire is connected to a ground wire input terminal of a complete machine through a conducting wire, a grounding sampling signal is formed between the grounding terminal and an inputted phase voltage, a sampled voltage signal is respectively inputted to a reverse end and the end in the same direction of an operational amplifier U1 through a resistance R1 and a resistance R2, a signal outputted by the operational amplifier U1 is inputted to the end in the same direction of a comparator U2 after being rectified by a rectification diode D1 and being filtered by a filter capacitance C1, simultaneously a benchmark signal is acquired after a main-board power supply is divided by a resistance R6 and a resistance R7, the benchmark signal is directly inputted to a reverse end of the comparator U2, the sampling signal is compared with the benchmark signal by the comparator U2 to acquire an output signal which is connected with a base electrode of a triode Q1 through a limiting resistance R8, and an output relay K1 is driven by controlling the triode Q1. Finally the output relay K1 is used for controlling the work state of an output alternative-current contactor and controlling an acoustic-optic alarming circuit to work so as to realize the ground wire missing alarming.

Description

technical field [0001] The invention relates to a circuit, in particular to a circuit capable of realizing alarm protection when a voltage stabilizer lacks ground. Background technique [0002] When the voltage stabilizer is used without a grounding wire or the grounding wire is open, if there is a phase voltage leakage, accidents are prone to occur. Once the grounding wire fails, the power supply cannot be cut off in time, which will cause personal and property losses. The existing voltage stabilizer is not equipped with a ground loss protection circuit, so it cannot guarantee that the ground wire is effective. Therefore, voltage stabilizers currently on the market cannot meet people's needs in terms of safety and reliability. Contents of the invention [0003] The purpose of the present invention is to provide a simple, convenient, safe and reliable voltage stabilizer ground shortage alarm protection circuit for the shortcomings of the existing voltage stabilizer techno...

AI Technical Summary

Problems solved by technology

[0002] When the voltage stabilizer is used without a ground wire or the ground wire is open, if there is a phase voltage leakage, accidents are prone to occur. Once the ground wire fails, the power supply cannot be cut off in time, which will cause personal and property

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