Non-polarized contactless relay

Details Non-polarized contactless relay Non-polarized contactless relay

1983-03-11

1985-11-19

Scott, J. R.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307240, 307244, 307575, 307583, H03K 1756

Patent

active

045544620

ABSTRACT:
Disclosed is a non-polarized, contactless relay constructed of electronic circuitry devoid of mechanical contacts but capable of performing the same function as a relay with such contacts. The relay includes a transformer, a control circuit for applying an oscillatory signal to the primary windings of the transformer in accordance with a command input, a rectifying circuit for rectifying A.C. power obtained from the secondary windings of the transformer in response to the oscillatory signal applied to the primary windings, a smoothing circuit which smooths the rectified output produced by the rectifying circuit for delivering D.C. power, and switching means composed of a pair of MOS-type field-effect transistors driven by the D.C. output of the smoothing circuit. The command input, namely "1" or "0" logic, applied to the control circuit results in the supply of the D.C. signal to the MOSFETs when logical "1" holds, driving the MOSFETs into conduction to form a closed path between the output terminals of the switching means and, hence, close the relay.

REFERENCES:
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patent: 3418495 (1968-12-01), Bose
patent: 3602738 (1971-08-01), Bohm
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patent: 4095128 (1978-06-01), Tanigaki
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patent: 4417153 (1983-11-01), Onodera et al.
Electronics, vol. 51, No. 13, Jun. 22, 1978, A. D. Evans et al., pp. 105-112, "Higher Power Ratings Extend V-MOS FETs' Dominion".
European Search Report, completed May 27, 1983, by Examiner Arendt in Berlin.

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