System and method for protecting relay contacts

Details System and method for protecting relay contacts System and method for protecting relay contacts

1993-04-22

1996-01-30

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 5, 361 8, H02H 3033

Patent

active

054885302

ABSTRACT:
A system and method for protecting relay contacts from erosion utilizes a sensor which senses voltage change in a switch controlling a load relay. In response to operation of the switch, the sensor sends a current to a set of pass transistors which are connected in series to the load power source and the load to turn off the transistors thereby cutting off load current flow to the load. A delay element is connected in series between the sensor and the set of transistors which cuts off the current flow to the set of transistors for a period of time selected to enable the load relay contacts to fully close or fully open before conducting electrical current therethrough.

REFERENCES:
patent: 4504773 (1985-03-01), Suzuki et al.
patent: 4618906 (1986-10-01), Paice et al.
patent: 4811163 (1989-03-01), Fletcher
patent: 5164872 (1992-11-01), Howell

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