Watt/watt hour transducer having current signals and a modulator

Details Watt/watt hour transducer having current signals and a modulator Watt/watt hour transducer having current signals and a modulator

1974-12-13

1976-08-24

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

332 9R, G01R 2106

Patent

active

039769429

ABSTRACT:
A watt/watthour meter of improved accuracy and relatively lower cost than a conventionally designed device with similar specifications. A current proportional to instantaneous power is obtained from a current-voltage multiplier circuit and is maintained as a current signal through amplifying and filtering, through the watt output load and through integrating in the watthour section. The multiplier uses a chopper modulator which provides two identical output current sources both floating with respect to ground so that one may be connected to the watt output amplifier and one to the watthour integrator. The signal from the power line which is proportional to the voltage modulates the signal which is proportional to the power line current by alternatively switching the modulated current between the two source outputs and by maintaining zero average input current flow from the modulated current signal through use of dc blocking capacitors.

REFERENCES:
patent: 3500200 (1970-03-01), Woodhead
patent: 3655955 (1972-04-01), Brendle
patent: 3673495 (1972-06-01), Riebs
patent: 3725774 (1973-04-01), Stewart
patent: 3775683 (1973-11-01), Barta et al.
patent: 3794917 (1974-02-01), Martin et al.

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