Optically isolated solid state relay

Details Optically isolated solid state relay Optically isolated solid state relay

1981-09-21

1983-10-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307498, 307571, 307580, 307471, H03K 342, H03K 1942

Patent

active

044081316

ABSTRACT:
A solid state relay is provided with a control logic circuit which receives a low level input control signal and controls a power field effect transistor (FET) switching element by means of an optical isolator. Connecting an external power source to a function selecting input terminal causes the relay to operate as a normally open, normally closed, or latching relay. A voltage spike suppression network protects the FET from voltage spikes appearing across it.

REFERENCES:
patent: 3963947 (1976-06-01), Bogel
patent: 4188547 (1980-02-01), Fox
patent: 4227098 (1980-10-01), Brown et al.

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