Circuit for the compensation of current interference signals

Details Circuit for the compensation of current interference signals Circuit for the compensation of current interference signals

1974-12-11

1976-01-27

Pellinen, A. D.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

317 49, 324 51, H02J 102

Patent

active

039355128

ABSTRACT:
A circuit which compensates for interference signals when monitoring conditions such as overcurrents and the like in a larger network. The circuit includes a current-signal branch and a compensating branch, the latter fed with an interference voltage and containing a variable gain amplifier. Both branches of the circuit are coupled to a signal superimposing element in the form of a summing amplifier, the output of which is applied to a polarity comparator. The polarity comparator, which is three-state device, forms a portion of a feedback network for controlling the gain of the variable gain amplifier.

REFERENCES:
patent: 3048744 (1962-08-01), Warrington
patent: 3519884 (1970-07-01), Paddison et al.
patent: 3543092 (1970-11-01), Hoel

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