Optical-electronic relay

Details Optical-electronic relay Optical-electronic relay

1975-03-25

1976-09-14

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, 307255, H03K 1700

Patent

active

039809030

ABSTRACT:
A relay controlled by light radiation ensuring electrical insulation between the control circuit and the controlled circuit, comprising a transistor T connected across terminals of the circuit (S,R) and controlled by a signal coming from the phototransistor (PT). The protection of this phototransistor against the voltage differences appearing across the terminals (1) (1'), depending upon whether the circuit is open or closed, is provided by a constant current supply circuit incorporating a transistor (T') controlled by a signal created across the terminals of a resistor (22).

REFERENCES:
patent: 3693027 (1971-09-01), Garaway
patent: 3813539 (1974-05-01), Sioma
patent: 3818235 (1974-06-01), Johnson et al.

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