Method for arc suppression in relay contacts

Details Method for arc suppression in relay contacts Method for arc suppression in relay contacts

1986-10-01

1988-07-26

Tolin, G. P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 7, 361 8, 361 11, 307135, H01H 930

Patent

active

047604832

ABSTRACT:
In a circuit having an electro-mechanical relay, the contacts of which are subject to arcing, bridging across the electro-mechanical relay in a manner configured to begin conducting electrical current around the electro-mechanical relay prior to closing the electro-mechanical relay and to continue conducting electrical power around the electro-mechanical relay for a predetermined time after the onset of separation of contacts of the electro-mechanical relay pursuant to discontinuance of current flow through the electro-mechanical relay. An optical coupler is provided to ascertain a current flow through the relay coil effected to close the electro-mechanical relay contacts, and activates a shunt device in bridging electrical current flow around the electro-mechanical relay. The shunt device is provided to be substantially non-load carrying while the electro-mechanical relay is closed. Utility is found in protecting electro-mechanical relay contacts against damage due to arcing.

REFERENCES:
patent: 4389691 (1983-06-01), Hancock
patent: 4420784 (1983-12-01), Chen et al.
patent: 4438472 (1984-03-01), Woodworth

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