Contact feedback type relay control system

Abstract

The invention discloses a contact feedback type relay control system and relates to the electronic and electrical field. The control system comprises a single chip microcomputer, a plurality of relay driving circuits and a plurality of relay control circuits, wherein the single chip microcomputer outputs a plurality of channels of control signals and are connected with signal input ends of the plurality of relay driving circuits respectively, each of the plurality of relay driving circuits adopts a Darlington transistor array chip which comprises an emitting electrode, a common port, a plurality of signal input ends and a plurality of driving signal output ends, driving signal output ends and signal input ends are in the one-to-one correspondence relationship, emitting electrodes are grounded, common ports are connected with a power supply, one end of each of relay control circuits is connected with one driving signal output end of relay driving circuits, the other end of each of relay control circuits is connected with the power supply. According to the contact feedback type relay control system, the structure of an input control circuit is changed, so that on the premise that the relay closing is guaranteed, the current of the control circuit can be reduced, the voltage at two ends of a relay on the input side can be reduced, and the power consumption required by controlling of the relay can be reduced.

Description

technical field [0001] The invention relates to the field of electronics and electricity, in particular to a contact feedback relay control system. Background technique [0002] The voltage relay includes a coil, a normally open contact and a normally closed contact. When the input voltage of the voltage relay reaches a specified value, the normally open contact at the output end of the voltage relay is closed, and the normally closed contact is closed. That is to disconnect, so that the controlled output circuit is turned on or off, so as to achieve the purpose of changing the circuit structure of the controlled circuit side, thereby transmitting control signals or driving power devices. Voltage relays are widely used in power protection, automation, remote control, measurement and communication devices. The voltage relay is an intermediate device for weak current to control strong current, and it cannot be replaced as a drive device for isolation control. At the same tim...

AI Technical Summary

Problems solved by technology

[0004] The control scheme of the existing voltage relay is generally to control the voltage relay with an input voltage greater than the operating voltage to ensure the safe operation of the voltage relay. However, after the voltage relay operates, the input voltage is still greater than the operating voltage, and the power consumption is very large.

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