Title: Floating power switch

Abstract: A floating transistorized switching circuit comprises an optical coupler for electrically isolating a source of control signals from the switching circuit; a floating DC voltage supply, electrically isolated from the AC power line, for providing positive and negative logic level operating voltages, referenced to whatever voltage appears at the output terminal of the switching circuit; an output stage including first and second NPN switching transistors connected in a Darlington configuration; and a logic network responsive to the output signal from the optical coupler going on for turning on the Darlington output stage, and to this output signal going off for turning off the Darlington output stage.

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Inventors: Baker, Richard H. (Bedford, MA, US)

Application Number: 944632
Filing Date: 1978-09-21
Publication_date: 1980-11-25
Assignee: Exxon Research & Engineering Co. (Florham Park, NJ)
Primary Class(es): 327/483 327/575
Other Classes:
US Patent Ref:

2767365	Oct, 1956	Guggi	307/315.
3766409	Oct, 1973	Shuey	307/311.
4021683	May, 1977	Splatt	307/311.
4027228	May, 1977	Collins	307/311.

Other Refs:
Primary Examiner: Miller, Jr., Stanley D.
Assistant Examiner: Davis, B. P.
Attorney: Watov; Kenneth