Relay control circuit and method of operating same

Details Relay control circuit and method of operating same Relay control circuit and method of operating same

1991-07-16

1994-07-12

Williams, Howard L.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361 3, 361179, 361 2, H05B 102

Patent

active

053294173

ABSTRACT:
A method of operating a relay includes shifting, by a predetermined time increment each time the relay coil is energized, the time in the sine wave of the applied AC power source at which the relay coil is energized. The method further provides for similarly shifting the time in the sine wave at which the relay coil is de-energized. When applied to a system having two relays, the method includes providing such shifting to both relays and further includes providing a predetermined time delay between the time one relay is de-energized and the other relay is energized.

REFERENCES:
patent: 4745515 (1988-05-01), Fowler
patent: 4897755 (1990-01-01), Polster et al.
patent: 5064998 (1991-11-01), Holling

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