Logic circuit monitor

Details Logic circuit monitor Logic circuit monitor

1980-02-25

1982-03-02

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

307219, 340508, 340639, 340653, G08B 2100

Patent

active

043180930

ABSTRACT:
A monitor for logic circuits detects loss of redundancy within the monitored circuit and designates that portion thereof which is out of service. Loss of redundancy is detected by sensing the passage of normal load current, or a portion thereof, through shunt current paths; the occurrence of such current flow coupled with the direction of flow uniquely determining the portion of the logic circuit which is out of service. In a preferred form of the invention, a low ohmic valued resistor is connected in each shunt current path. Upon loss of redundancy, a voltage signal generated across at least one such resistor, is applied to one or more parallel connected amplifiers responsive to the signal to activate corresponding switching circuits and audio/visual indicators.

REFERENCES:
patent: 3373367 (1968-03-01), Clarke
patent: 3748540 (1973-07-01), Eggenberger et al.
patent: 3829232 (1974-08-01), Fieglein

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