A drive interface system for single-coil relays that supports both active and standby drives

Abstract

The present invention provides a drive interface system for a single-coil relay that supports both main and standby drives, so that two mutually redundant safety drive units can drive the single-coil relay through the drive interface system, including a drive interface module; a drive interface module The input end of the main safety drive unit and the output end of the backup safety drive unit are connected to the output end of the drive interface module, and the output end of the drive interface module is connected to the single-coil relay. The main safety drive unit and the backup safety drive unit are redundant with each other; the drive interface module includes mandatory guidance Relay, one group of outputs of the main safety drive unit is connected to the coil of the forced guide relay, the other group of outputs is connected to the normally open contact of the forced guide relay, and the output of the backup safety drive unit is connected to the normally closed contact of the forced guide relay; in the forced guide The output terminal of the relay connects the normally open contact and the normally closed contact in parallel to the single coil relay. This system makes the self-checks of the main and backup safety drive units not affect each other.

Description

technical field [0001] The invention relates to the technical field of rail transit circuits, in particular to a drive interface system for a single-coil relay that supports both active and standby drives. Background technique [0002] In domestic rail traffic signal systems, double-coil relays are usually used to build rail safety circuits, while foreign markets and some domestic applications use single-coil relays to build safety circuits due to cost and other factors. The safety drive unit of the rail transit system is used to execute the control command of the interlocking machine. In order to improve the system availability, two redundant safety drive units are usually used to output 24V voltage to drive the two coils of the double-coil relay. Some safety drive units are also mainly designed for this scenario. During operation, the safety drive unit needs to periodically change the level of the output port and read back the level information of the port for self-checki...

AI Technical Summary

Problems solved by technology

During operation, the safety drive unit needs to periodically change the level of the output port and read back the level information of the port for self-testing of its own circuit. When two redundant safety drive units drive a single-coil relay together, the main and backup systems The output port will be connected to the same group of contacts, and the self-test result will be affected by the output level of the corresponding port, which will eventually cause one of the safety drive units to enter an unavailable state due to self-test failure, reducing system availability

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