Thyristor fault self-test method, circuit, connector and electrical equipment

Abstract

The invention relates to the technical field of leakage detection, and discloses a thyristor fault self-test method, circuit, connector and electrical equipment. The technical scheme of the present invention receives the AC synchronous signal of the half-wave rectification circuit through the thyristor test control module, and starts to detect the thyristor when it is judged that the AC amplitude of the AC synchronous signal is less than zero; within the first preset time outputting a turn-on signal to the controlled end of the thyristor to turn on the thyristor to obtain the first target voltage; outputting the turn-on signal to the controlled end of the thyristor within a second preset time to Turn on the thyristor to obtain a second target voltage; calculate the difference between the first target voltage and the second target voltage and compare it with a threshold to determine whether the thyristor fails, and output when the thyristor fails The fault signal warns the user, and realizes the self-testing of the silicon controlled rectifier in the leakage detection circuit, and does not need human-controlled detection.

Description

technical field [0001] The invention relates to the technical field of electric leakage detection, in particular to a thyristor fault self-test method, circuit, connector and electrical equipment. Background technique [0002] With the rapid popularization of household appliances, the high-frequency components of the load current of modern equipment have increased, and the leakage protection standards have become increasingly stringent. Leakage detection and protection circuits are required to conduct periodic tests to ensure normal operation and avoid possible damage to the human body due to fault conditions. [0003] The new generation of leakage protection standards require that when key circuits or components in the leakage protection circuit fail, the leakage protection chip can detect and start an audible and visual alarm. In this way, serious accidents caused by leakage protection circuit failure can be avoided. At present, leakage protection can be carried out by t...

AI Technical Summary

Problems solved by technology

At present, leakage protection can be carried out by thyristor in leakage protection circuit, but short circuit or open circuit between pins of thyristor is easy to occur during use of thyristor. This situation is called thyristor failure, and thyristor will not work. It is controlled and cannot be turned on or off through the trigger signal, so that the leakage protection circuit cannot work normally. However, at present, when the leakage protection is performed to detect the thyristor, it is necessary to use an additional AC signal to provide synchronization information, and an additional High-voltage isolation circuit and rectification circuit will have a large cost in terms of cost and complexity in circuit design

Images