Electronic type electric energy meter

Details Electronic type electric energy meter Electronic type electric energy meter

1986-06-13

1988-06-21

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

364483, 364606, G01R 21133

Patent

active

047527315

ABSTRACT:
An electronic type electric energy meter comprising an analog adder and an analog subtracter by which signals proportional to a voltage and a current of a circuit to-be-measured are respectively added and subtracter therebetween, A/D converters which convert outputs of the analog adder and the analog subtracter into digital values, and an arithmetic control unit by which the digital values from the A/D converters corresponding to the analog addition value and subtraction value are respectively squared so as to obtain a difference of the squared values, and the difference is accumulated thereby to measure electric energy. The values of the input analog voltages of the A/D converters vary in only narrow ranges, so that the electric energy can be calculated at high precision in a wide current variation range by means of the A/D converters having small numbers of bits.

REFERENCES:
patent: 3780273 (1973-12-01), Turrell
Johnson, "A Digital Quarter Square Multiplier", IEEE Trans. on Computers, vol. C-29, No. 3, Mar. 1980, pp. 258-261.
Stockton, J., "Proposed Quarter Squares Double Dual-Slope Digital Wattmeter", Electronics Letters, vol. 16, No. 21, Oct. 9, 1980, pp. 819-820.
"A Wideband Sampling Wattmeter", Gerald N. Stenbakken, IEEE Transaction on Power Apparatus and Systems, vol. PAS-103, No. 10, Oct. 1984.
"Halbleiter-Schaltungstechnik", Tietze et al, Springer-Verlag, 1984.

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