Self-learning relay zero point arc extinguishing method and relay control circuit

Abstract

The invention provides a self-learning relay zero point arc extinguishing method and a relay control circuit. The self-learning relay zero point arc extinguishing method comprises the steps that the delay time of a controller is adjusted, the controller is enabled to give out a relay contact release signal after the delay time by starting from zero point crossing of an alternating current rising edge, and a relay releases a relay contact near the current zero crossing point. According to the self-learning relay zero point arc extinguishing method provided by the invention, the controller givesout a release signal to the relay after the delay time by starting from zero point crossing of the alternating current rising edge, adjustment is performed on the delay time according to a relation between a time point of actual release of the relay contact and a time point of zero point crossing of the alternating current rising edge, thereby enabling the release time point of the relay contactis enabled to be near the zero crossing point of the alternating current rising edge, and thus reducing the arc generated by relay release; and the delay time is automatically determined by the control circuit of the relay, and the method has a good arc extinguishing effect for various types of relays.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a self-learning zero-point arc-extinguishing method of a relay and a relay control circuit. Background technique [0002] In existing products that use relays to control AC high-power loads, when the relay contacts are disconnected, a high-temperature and high-pressure arc will be generated between the dynamic and static contacts, resulting in ablation and oxidation of the contact surface, resulting in irreversible damage, which directly affects the The service life of the relay; at the same time, the conductivity of the switch is reduced, the contact is heated, resulting in waste of electric energy, and in severe cases, it may cause catastrophic consequences such as fire. Since the AC current is very small near the zero crossing point, the relay contacts are released during this period, and the arc generated between the moving and static contacts is negligible, or even there...

AI Technical Summary

Problems solved by technology

However, due to different types of relays, different individuals of the same type of relay, or even different periods of the same relay, the time required for the relay to complete the release action is different, and the arc extinguishing effect of artificially setting a fixed delay time will also vary a lot. , difficult to adapt to different relay

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