One-way thyristor full condition monitor

Abstract

The invention provides a unidirectional thyristor full state monitor, which is characterized in that the monitor comprises a conduction angle indication circuit, a power supply circuit , a power supply switching circuit, a high-frequency signal generation circuit, a unidirectional thyristor working state detection and alarm circuit, an overheat detection circuit and an infrared alarm circuit. The advantages are that during the period when a unidirectional thyristor bears a reverse voltage, power is input on the spot automatically without complex wires, so that the unidirectional thyristor full state monitor is especially suitable for large number of middle / large-power electric power conversion devices; and by outputting a high-frequency signal to the two ends of the unidirectional thyristor to enable power supply transformer coils connected to cathode and anode of the unidirectional thyristor to generate enough inductive reactance under a uncharged state, working current of the monitor is greatly reduced, and the monitor is allowed to realize miniaturization, and can carry out full state detection on the unidirectional thyristor, so that the monitor makes full state monitoring of a large number of unidirectional thyristors in the middle / large-power electric power conversion devices practicable and feasible.

Description

technical field [0001] The invention relates to the field of control, and is a one-way thyristor full-state monitor. Background technique [0002] In the prior art, the working state of the silicon controlled rectifier can only be monitored through computer serial communication. The disadvantages are that the resistance to strong magnetic interference is poor, and the monitoring circuit is powered by wires, and the equipment connection is complicated. The prior art is really just a routine overheating detection for the Triac. Since the number of one-way thyristors used in medium and high-power power conversion equipment is dozens or even hundreds, in most cases, in order to reduce equipment wiring, the independent overheat detection of each one-way thyristor is cancelled. , the one-way thyristor is basically in a non-detection state. At present, there is no really applicable one-way thyristor full state monitor. Contents of the invention [0003] The purpose of the pres...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the working state of the silicon controlled rectifier can only be monitored through computer serial communication. The disadvantage is that the resistance to strong magnetic interference is poor, and the monitoring circuit is powered by wires, and the equipment connection is complicated.

At present, there is no real applicable unidirectional thyristor full state monitor

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