Failsafe logic circuit wherein the phototransistor of a precedin

Details Failsafe logic circuit wherein the phototransistor of a precedin Failsafe logic circuit wherein the phototransistor of a precedin

1986-05-28

1988-03-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250551, H01J 3150, H01J 4014

Patent

active

047315288

ABSTRACT:
Failsafe logic circuits, for instance AND-, NOR-, NAND- and OR-circuits are devised at which at least one signal input is connected to a signal output via an optocoupler. Herewith dimensioning problems with respect to transistors and coupling capacitors as known from conventional failsafe logic circuits do not appear. Further on an optocoupler cannot fail in such a manner that between a photodiode and a phototransistor a galvanic coupling may arise.

REFERENCES:
patent: 2895054 (1959-07-01), Loebner
patent: 2900522 (1959-08-01), Reis
patent: 2900574 (1959-08-01), Kazan
patent: 2907001 (1959-09-01), Loebner
patent: 2984749 (1961-05-01), Ross
patent: 2997596 (1961-08-01), Vize
patent: 3020410 (1962-02-01), Bowerman
patent: 3078373 (1963-02-01), Wittenberg

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