Fail-safe one and only one signal checking circuit

Details Fail-safe one and only one signal checking circuit Fail-safe one and only one signal checking circuit

1984-11-13

1987-02-03

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307355, 307362, H03K 5153

Patent

active

046410457

ABSTRACT:
A vital checking circuit for assuring the reception of only one input signal including a differential amplifier having a pair of PNP transistors. A voltage divider having a first and a second biasing resistor connected to the input of one of the pair of transistors. An a.c. signal transformer coupled to the input of the one of the pair of transistors. A third biasing resistor connected to the input of the other of the pair of transistors. A plurality of current-drawing circuits connected to the third biasing resistor, and an a.c. output signal derived from the other of the pair of transistors when and only when one of the plurality of current-drawing circuits is drawing current through the third biasing resistor.

REFERENCES:
patent: 3376434 (1968-03-01), Darrow
patent: 3492589 (1970-01-01), Rotier
patent: 3497720 (1970-02-01), Slawson
patent: 3604949 (1971-09-01), Conzelmann et al.

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