State detection device for high-potential thyristor

Abstract

The invention discloses a state detection device for a high-potential thyristor. The device comprises a detection circuit board and a detection resistor circuit, wherein the detection circuit board is connected with the detection resistor circuit and connected with a detected thyristor through the detection resistor circuit; the detection resistor circuit comprises detection resistors; the detection circuit board comprises two parallel branches, a first parallel branch comprises a first diode, and a second parallel branch comprises an optical fiber transmitter; when the detected thyristor withstands a forward voltage, current flows through the first diode in the detection circuit board to protect the optical fiber transmitter from withstanding over-high backward voltage; and when the detected thyristor withstands the backward voltage, the current flows through the optical fiber transmitter, the optical fiber transmitter transmits a signal through an optical fiber, and withstanding of the backward voltage by the detected thyristor is detected. The state detection device for the high-potential thyristor is applicable to a high-potential system, a special power circuit is not required to be provided for the detection circuit board, the state of the thyristor can be easily detected, and the optical fiber transmitter can reliably operate in the high-potential system.

Description

technical field [0001] The invention relates to a thyristor detection circuit, in particular to a simple and convenient thyristor state detection device suitable for high-potential systems in high-voltage and high-power power electronic devices using thyristors. Background technique [0002] In high-voltage and high-power power electronic devices with thyristors, it is often necessary to detect whether the thyristors have broken down. Whether the thyristor has the ability to withstand a certain reverse voltage is the basis for judging whether it breaks down. On this basis, the traditional detection method is to connect several resistors in parallel at both ends of the thyristor to be detected, and determine whether the thyristor is subjected to reverse voltage by detecting the voltage of one of the resistors; Detect the on-off state of the phototransistor of the optocoupler to determine whether the thyristor is subjected to reverse voltage. Among the existing technologies,...

AI Technical Summary

Problems solved by technology

The power supply of the detection circuit is obtained from the high potential thyristor, and the power supply circuit is more complicated

The original method of detecting the on-off state of the optocoupler phototransistor is limited by the voltage isolation capability of the optocoupler, and is no longer applicable when the thyristor potential is higher than a certain value.

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