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

H - Electricity

03

K

328/114

H03K 5/08 (2006.01) H01L 31/12 (2006.01) H03K 3/2893 (2006.01) H03K 3/42 (2006.01)

Patent

CA 1089939

CONTROL CIRCUIT INITIATING CONDUCTION OF AN OPTO-ISOLATOR UNIT ABSTRACT OF THE DISCLOSURE A control circuit for turning on an optical iso- lation unit only when an input signal is at least of a given magnitude or threshold level. The circuit exhibits a resis- tive 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 substan- tially constant current above the threshold.

278535

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