Relay control circuit and relay control system

Abstract

The invention discloses a relay control circuit. The relay control circuit comprises a micro control unit, a logic reverse unit, a first switch unit and a second switch unit, wherein when the relay control circuit is used for controlling a relay to switch on, the micro control unit is used for controlling the switch-off of the first switch unit so as to allow the relay to switch on, and the microcontrol unit controls the logic reverse unit to output a first logic signal for controlling the switch-off of the second switch unit so as to allow the relay to switch on; and when the relay control circuit is used for controlling the relay to switch off, the micro control unit is used for controlling the first switch unit to switch on so as to allow the relay to switch off, and the micro controlunit controls the logic reverse unit to output a second logic signal for switching on the second switch unit so as to allow the relay to release induced electromotive force produced by a switch-off action through the second switch unit. The switch of the relay is switched off rapidly and correctly and faulty operation is avoided. The invention also provides a relay control system.

Description

technical field [0001] The invention relates to a control circuit, in particular to a relay control circuit and a relay control system using the relay control circuit. Background technique [0002] The popularity of computer technology has significantly increased the demand for relays for microcomputers, and relays with microprocessors will develop rapidly. In the early 1980s, the digital time relays produced in the United States could be controlled by instructions. The combination of relays and microprocessors can form a small and perfect control system. Industrial robots controlled by computers are currently growing at a rate of 3.5% per year. Now, the computer-controlled production system has been able to produce a variety of low-cost relays on a production line, and can automatically complete a variety of operations and testing. [0003] The general relay applies the principle of electromagnetic induction. By energizing the coil to generate magnetic attraction, the togg...

AI Technical Summary

Problems solved by technology

However, according to the principle of electromagnetic induction, the coil will generate a residual induced magnetic field in the opposite direction when the power is cut off, and the residual induced magnetic field will still generate magnetic attraction, causing the switch of the relay to fail to be disconnected reliably, resulting in disordered operation of the electronic equipment system

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