Circuit arrangement for monitoring operating conditions of direc

Details Circuit arrangement for monitoring operating conditions of direc Circuit arrangement for monitoring operating conditions of direc

1980-09-08

1982-06-22

Robinson, Thomas A.

179 18GC, H04M 322

Patent

active

043364241

ABSTRACT:
The circuit arrangement monitors operating conditions of a group of direct current devices. The operating conditions are represented by different potentials occurring at a sampling connector of each direct current device. A first and a second selector unit, each having parallel signal inputs, are arranged symmetrically with respect to commonly connected outputs. Signal inputs of the first selector are connected to corresponding sampling connectors of the DC devices. A control unit for generating a control signal train has an output which is commonly connected to control inputs of both selector units. Commonly grounded filter capacitors are connected to the signal inputs of the second selector unit. A comparator is connected by a first input to a reference voltage source and by a second input to the outputs of both selector units. At the output of the comparator there is delivered a rated output signal evaluating the potential at the presently selected sampling connector with respect to said reference voltage.

REFERENCES:
patent: 2238223 (1941-04-01), Kozma
patent: 2755340 (1956-07-01), Oberman

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