Control circuit initiating conduction of an opto-isolator unit

Details Control circuit initiating conduction of an opto-isolator unit Control circuit initiating conduction of an opto-isolator unit

1976-06-21

1978-04-25

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307237, 307254, 307311, 307318, 307297, H03K 520, H03K 508

Patent

active

040865037

ABSTRACT:
A control circuit for turning on an optical isolation unit only when an input signal is at least of a given magnitude or threshold level. The circuit exhibits a resistive input below the threshold level and a constant current characteristic above the threshold. An arrangement of transistors is provided to bypass the opto-isolator below the threshold and to drive the opto-isolator with substantially constant current above the threshold.

REFERENCES:
patent: 3937987 (1976-02-01), Ahmed

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