Two-machine hot standby switching circuit

Abstract

The invention discloses a two-machine hot standby switching circuit. The two-machine hot standby switching circuit comprises an isolating circuit, a switching interlocking circuit and an active / standby indicating circuit, wherein the switching interlocking circuit comprises two relays, each relay comprises three contact switches, one of the three switches is normally closed and the other two of the three switches are normally open. Isolated system A active striving signals are connected to a first end of a coil of a system A relay through the normally closed switch of a system B relay, and a second end of the coil of the system A relay is connected with a system A control power supply; isolated system B active striving signals are connected to a first end of a coil of the system B relay through the normally closed switch of the system A relay, and the second end of the coil of the system B relay is connected with a system B control power supply; system A active / standby indicating signals are output to a system A and a system B and system B active / standby indicating signals are output to the system A and the system B through the normally open switches of the system A and the system relays. The two-machine hot standby switching circuit has the advantages that the circuit is simple, the quantity of the used relays is small and the cost is low; the circuit reliability is high and the isolation of the two systems is realized.

Description

Technical field [0001] The invention relates to a dual-system hot backup system, in particular to a dual-system hot backup switching circuit. Background technique [0002] Nowadays, electronic product systems are developing rapidly. In some occasions with high reliability requirements, dual-system hot standby, three out of two, two out of two out of two system modes are used to improve the reliability of the product system. Once the system has problems, The system can return to normal by itself, and the maintenance personnel are prompted to repair it. The dual-system hot-standby system needs to use a dual-system hot-standby switching circuit to switch between the main system and the standby system. The existing dual-system hot-standby switching circuit has the following defects and limitations: multiple relays are required and the circuit is complicated; There is an uncertain state when manually operating the switch. Summary of the invention [0003] The technical problem to be ...

AI Technical Summary

Problems solved by technology

The dual-system hot-standby system needs to use a dual-machine hot-standby switching circuit to realize the switch between the main system and the backup system. The existing dual-machine hot-standby switching circuits have the following defects and limitations: multiple relays are required, and the circuit is complicated; There is an uncertain state when manually operating the toggle switch

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