Device for generating a signal for a predetermined interval afte

Details Device for generating a signal for a predetermined interval afte Device for generating a signal for a predetermined interval afte

1974-04-23

1976-01-20

Miller, J. D.

3171555, H01H 4718

Patent

active

039341780

ABSTRACT:
For the purpose of assuring the holding latching relay in a nonconductive situation whenever an operator turns off a power switch, this invention provides a circuit for generating a signal for a predetermined time interval after the power switch is opened. The circuit includes a power switch, a capacitor charge only when the power switch is closed, a transistor and means for applying a terminal voltage of the capacitor to the transistor in order to render it conductive when the power switch is opened. A rectifier may be provided to prevent a reverse current and the capacitor maybe charged through the rectifier.

REFERENCES:
patent: 3144568 (1964-08-01), Silliman et al.
patent: 3205411 (1965-09-01), Culbertson
patent: 3282631 (1966-11-01), Mosinski
patent: 3683301 (1972-08-01), Boley et al.
patent: 3732468 (1973-05-01), Witt et al.

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