Power transducer

Details Power transducer Power transducer

1981-08-31

1985-04-30

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

328160, G01R 2106

Patent

active

045146861

ABSTRACT:
A Power Transducer is disclosed, such as a watt-watthour Transducer, having a dual multiplier circuit receiving inputs from a power source to be monitored and a triangle wave generator. The circuit includes first and second transformers which separately receive voltage and current inputs representative of the power line to be monitored. The first transformer provides dual outputs of opposite polarity which are isolated and scaled replicas of the input voltage. The dual outputs are separately channeled through half-wave multiplier paths, to a comparator in each path, which comparators receive the input from the triangle wave generator to produce a pulse modulated output for control of a switch in each path, which switches also receive the current signal from the second transformer. The outputs from the switches have pulse heights proportional to the instantaneous value of the current and pulse widths proportional to the incoming voltage with the integral being equal to the product of the voltage and current. The combined switch outputs are filtered to remove the chopping frequency and then coupled to a load.

REFERENCES:
patent: 3712977 (1973-01-01), Rice, Jr.
patent: 3976942 (1976-08-01), Mayfield
patent: 4027241 (1977-05-01), Jauch
patent: 4055804 (1977-10-01), Mayfield
patent: 4182983 (1980-01-01), Heinrich et al.

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