Relay driving apparatus and method having relay contact...

Details Relay driving apparatus and method having relay contact... Relay driving apparatus and method having relay contact...

2007-09-11

2007-09-11

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

Reexamination Certificate

active

10878394

ABSTRACT:
A relay driving apparatus has a control circuit, which supplies a first voltage to a relay coil in response to a relay driving signal to turn on a relay contact, and thereafter a second voltage lower than the first voltage to the relay coil to keep an ON state of the relay contact. The apparatus also has a detection circuit, which is connected in a coil current supply path and detects a state change of the relay contact to an OFF state from the ON state based on a current change in the coil current. The control circuit supplies the first voltage again to the relay coil in response to the state change detected by the detection circuit to restore the ON state.

REFERENCES:
patent: 3571659 (1971-03-01), Anzai et al.
patent: 6518764 (2003-02-01), Shirato
patent: 6798633 (2004-09-01), Rossbach
patent: B2-63-62052 (1988-12-01), None
patent: A-10-255627 (1998-09-01), None

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