Electronic circuit for measuring AC electrical energy

Details Electronic circuit for measuring AC electrical energy Electronic circuit for measuring AC electrical energy

1984-03-19

1986-06-24

Myracle, Jerry W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324 74, G01R 2106, G01R 21127

Patent

active

045969515

ABSTRACT:
An improved circuit is provided for a solid state electrical energy meter having a pair of mutual inductance current transducers, a pulse width modulation circuit, an analog switch, and a voltage-to-frequency converter. The pulse width modulation circuit includes an integrator having a first operational amplifier with a feedback circuit providing a constant DC gain and a variable gain at the power frequency. The pulse width modulation circuit also includes a second operational amplifier configured as a comparator and connected to the first operational amplifier such that the reference level of the comparator is proportional to the average DC output of the first operational amplifier. The summing resistors connected to the input of the integrator are of like value and are formed in a common array.

REFERENCES:
patent: 4456878 (1984-06-01), Gamoh
Hamburg, D. et al., "An Electronic Wattmeter . . . ", IEEE Trans. on Magnetics, Sep. 1971, vol. MAG-7, No. 3, pp. 438-442.
Mase, S., "High-Accuracy IC-Oriented AC Power Meter", Japan Electronic Engineering, No. 91, Jun. 1974, pp. 37-41.
Boghosian, D. et al., "A Novel Electronic Energy Meter Design", Third Int'l Conf. on Metering Appt. & Tariffs for Elect. Supp., London, England, Nov. 1977, pp. 252-255.

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