Relay drive circuit

Details Relay drive circuit Relay drive circuit

2008-04-15

2008-04-15

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

C361S154000, C361S153000, C361S152000

Reexamination Certificate

active

07359175

ABSTRACT:
A potential of an end of the coil is inputted to a plate-OFF detecting portion which detects OFF-tendency in which a plate of a relay is about to get apart from a head of a core of the relay. When the OFF-tendency is detected, a coil current for supplying a coil of the relay is set to a first current value with which a plate of an electromagnetic relay is drawn and a movable contact of the relay comes in contact with a fixed contact of the relay. When an external disturbance ends, the coil current is returned to a second current value, which is smaller than the first current value, so that the movable contact and the fixed contact are kept in contact with each other.

REFERENCES:
patent: 2955240 (1960-10-01), Gardner
patent: 4368501 (1983-01-01), Gingrich
patent: 5196730 (1993-03-01), Matsuo
patent: 5317475 (1994-05-01), Siepmann
patent: 5428496 (1995-06-01), Buchta
patent: 6249418 (2001-06-01), Bergstrom
patent: 6807036 (2004-10-01), Baldwin
patent: 2005/0024102 (2005-02-01), Kondo
patent: 408077903 (1996-03-01), None

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