Communications: electrical – Condition responsive indicating system – Specific condition
Patent
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
Mitchell John F.
Wood Robert J.
Ahern John F.
Austin Ormand R.
Caldwell Sr. John W.
General Electric Company
Myer Daniel
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