Relay contact protective circuit

Details Relay contact protective circuit Relay contact protective circuit

1988-08-29

1990-09-25

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 8, 361187, 361198, H02H 722

Patent

active

049597469

ABSTRACT:
A contact protective circuit for a relay detects a transient in the relay operating coil and turns on a low resistance power MOSFET in shunt relation with the contacts before the contacts close or open whereby arcing or deposition of metal on the contracts is avoided. Timing circuitry is provided for controlling the MOSFET to conduct large direct currents for short periods of time. In one embodiment, a ramp up circuit responds to a voltage level in a control signal to drive the operating coil and power a DC-to -DC converter and a timing circuit. The invention provides for hot side switching as well as cold side switching of a load.

REFERENCES:
patent: 3639808 (1972-02-01), Ritzow
patent: 4389691 (1983-06-01), Hancock
patent: 4420784 (1983-12-01), Chen et al.
patent: 4525762 (1985-06-01), Norris
patent: 4658320 (1987-04-01), Hongel
patent: 4723187 (1988-02-01), Howell
patent: 4760483 (1988-07-01), Kugelman et al.

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