Contactless relay

Details Contactless relay Contactless relay

1983-04-27

1986-01-14

Scott, J. R.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307240, 307244, H03K 1756

Patent

active

045647682

ABSTRACT:
A contactless relay wherein the application of an A.C. signal to the primary winding of a transformer is controlled by a command input, and the A.C. signal obtained from the secondary winding of the transformer is rectified into a D.C. signal by a rectifier circuit. The D.C. signal drives a transistor switching element for switching action. The switching element includes a single bipolar transistor, or a pair of bipolar transistors which can be connected in parallel to increase the current-carrying capacity of the relay. The output terminals of the relay can be rendered non-polar by constructing the relay of two bipolar transistors having commonly connected emitters and commonly connected bases.

REFERENCES:
patent: 3378700 (1968-04-01), Stewart
patent: 3389327 (1968-06-01), Fine et al.
patent: 3418495 (1968-12-01), Bose
patent: 3760198 (1973-09-01), Mori et al.
patent: 3767942 (1973-10-01), Schwartz
patent: 4052623 (1977-10-01), Loberg
patent: 4150424 (1979-04-01), Nuechterlein
patent: 4255699 (1981-03-01), Calvin
patent: 4319144 (1982-03-01), King et al.
patent: 4423341 (1983-12-01), Shelly
Electronics, vol. 43, No. 14, Jul. 6, 1970, p. 78, New York, U.S., C. H. Ristad, "Switched Oscillator Controls Four-Wire Resistance Checks".
Electronics Design, No. 7, Apr. 1, 1970, p. 77, Rochelle Park, U.S., C. A. Herbst "Solid-State Isolation Relay has Nonpolarized Terminals".
Solid-State Relay by Evans et al., "Electronic", vol. 51, No. 13, Jun. 22, 1978, p. 108.

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