The invention relates to a safety AND gate circuit for a railway signal interlocking system. The safety AND gate circuit comprises a first isolated dynamic-static transduction booster circuit, a second isolated dynamic-static transduction booster circuit, a first safety relay, a second safety relay, a first power supply and a second power supply, the first power supply and the second power supply are used for supplying power for the first isolated dynamic-static transduction booster circuit and the second isolated dynamic-static transduction booster circuit respectively, input ends of the first isolated dynamic-static transduction booster circuit and the second isolated dynamic-static transduction booster circuit are connected with a pulse input signal end and a level input signal end in the railway signal interlocking system respectively, output ends of the first isolated dynamic-static transduction booster circuit and the second isolated dynamic-static transduction booster circuit are connected with input ends of the first safety relay and the second safety relay respectively, normally open contacts of the first safety relay and the second safety relay are serially connected, and normally closed contacts of the first safety relay and the second safety relay are connected by the aid of mutual inspection of the relays. Safety and reliability of the safety AND gate circuit are improved.
Safety AND gate circuit for railway signal interlocking system
2015-04-22
Patent
Electronic Resource
English
IPC: | B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |
Electronic railway-signal interlocking
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