Circuit for driving a relay with protection against contact degr

Details Circuit for driving a relay with protection against contact degr Circuit for driving a relay with protection against contact degr

1988-12-12

1990-06-26

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361160, 361170, H01H 4700

Patent

active

049377035

ABSTRACT:
A relay driver circuit which protects a relay against contact degradation. A detector circuit within the relay driver circuit receives an AC signal at a random phase. The detector circuit correspondingly provides a detector signal to a threshold responsive circuit, such as a timer, which drives the relay. The threshold responsive circuit responds substantially the same to a detector signal provided on a positive cycle and to a detector signal provided on a negative cycle. The relay driver circuit is applied to control a blower fan in an air conditioning system.

REFERENCES:
patent: 3670209 (1972-06-01), Hensen
patent: 4153922 (1979-05-01), Azuma et al.
patent: 4276483 (1981-06-01), Hayden
patent: 4423765 (1984-01-01), Hildebrand
patent: 4745515 (1988-05-01), Fowler
patent: 4769737 (1988-09-01), Ogita et al.
patent: 4833284 (1989-05-01), Park

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