Railway automatic overpass electronic switch light control thyristor monitoring and protection device and method

By connecting a BOD action and overvoltage event identification unit in parallel across the optically controlled thyristor and combining it with a monitoring unit for passive state monitoring and intelligent identification, the problem of not being able to verify the BOD status and distinguish the type of overvoltage event in the existing technology is solved. This enables accurate monitoring of the health status and overvoltage events of the optically controlled thyristor and analysis of the cause of the fault.

CN122307283APending Publication Date: 2026-06-30XIAN PERI POWER SEMICONDUCTOR CONVERSION TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN PERI POWER SEMICONDUCTOR CONVERSION TECHNOLOGY CO LTD
Filing Date
2026-03-10
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies cannot achieve online verification of the function and action threshold of the internal BOD of the anti-parallel optically controlled thyristor (LTT) in a single device, and lack reliable monitoring of the on/off state of the thyristor body and intelligent identification of overvoltage events, resulting in the inability to distinguish the cause of the fault and provide key data during operation and maintenance.

Method used

By connecting a BOD action and overvoltage event identification and reporting unit in parallel across the two ends of the optically controlled thyristor, and combining it with the monitoring unit for passive state monitoring and intelligent identification, reliable reporting and threshold verification of BOD protection actions are achieved, distinguishing between system faults and external overvoltage events, and providing comprehensive front-end perception and intelligent diagnosis.

Benefits of technology

It enables real-time monitoring of the health status of optically controlled thyristors and accurate identification of overvoltage events, providing key operation and maintenance information and fault cause analysis, thereby improving monitoring reliability and diagnostic capabilities.

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Abstract

This application discloses a circuit device and method for monitoring the status of a light-controlled thyristor and reporting overvoltage protection. The device includes a BOD (Browser Overvoltage) action and overvoltage event identification and reporting unit and a passive thyristor status monitoring unit connected in parallel across the two ends of the light-controlled thyristor pair within the switch. The BOD action and overvoltage event identification and reporting unit uses an external BOD mirror to reflect the internal protection threshold and utilizes back-end logic to intelligently identify signals, simultaneously achieving reliable reporting of BOD overvoltage protection actions and independent detection of unexpected system overvoltage events. The high-capacitive reactance circuit of the passive thyristor status monitoring unit enables low-power, passive online monitoring of the light-controlled thyristor status, directly indicating the health of the light-controlled thyristor component. This application integrates three major functions: real-time component status monitoring, BOD protection action reporting, and intelligent overvoltage event identification. It features full fiber optic isolation, passive high reliability, and is an innovative front-end sensing and intelligent monitoring and reporting solution specifically designed for railway automatic phase-splitting electronic switches.
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