Method and device for prolonging working life of relay

Abstract

The invention relates to a method and a device for prolonging the working life of a relay, which belong to the fields of a relay technology, a control component technology and an electronic circuit technology. The method is characterized in that both ends of a control contact of the relay are connected with an electronic switch in parallel, and the electronic switch which is connected with the contact in parallel is switched on before the switching-off moment of the contact; after the contact is switched on, the electronic switch is switched off; and the input end of the electronic switch and the detection end of a control relay coil are both connected on a control loop of the relay in series. The device is formed by connecting a relay, an optical coupling electronic switch, a light emitting diode, a resistor, a two-way diode, a triode, a control voltage end and a relay coil. The invention has the following beneficial effects: because the invention uses the modes of serial connection and parallel connection simultaneously to achieve the aim of controlling the switching-on and the switching-off of the electronic switch and the relay, the formation of electric arcs is prevented, and the damage of the metal contact of the relay is avoided, thereby prolonging the working life of the relay.

Description

technical field [0001] The invention belongs to the field of relay technology, control device technology, and electronic circuit technology, specifically the technology combining electronic circuit and relay. Background technique [0002] The relay is a relatively common and economical component for controlling the on-off of current. Since the relay controls on-off using metal sheets as contact points, an arc will be generated when it is turned on and off, so the service life of the relay is relatively short . [0003] In order to overcome the above shortcomings of the relay, many inventions have proposed the method of using a semiconductor switch in parallel or in series with the relay to reduce the generation of arc. [0004] In most inventions, the semiconductor switch and the relay are connected in parallel to form the on-off execution part. In this way, the semiconductor switch and the relay can act simultaneously to control the on-off of the circuit. In order to make...

AI Technical Summary

Problems solved by technology

But this invention also has a shortcoming. When the current through the coil is disconnected, due to the energy storage effect of the coil, a "reverse bias voltage" is generated on both sides of the coil, which affects the control part of the electronic switch and makes it break too quickly. Open, so this invention also reiterates that it needs a delay circuit mainly based on capacitance to ensure that the relay contact point is disconnected to avoid arc generation

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