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Abstract

Disclosed is an electronic watt-hour meter including: a plurality of sigma-delta modulators converting a plurality of analog detection currents, acquired by detecting currents flowing through a plurality of power lines having different phases, and a plurality of analog detection voltages, acquired by detecting voltages applied to the plurality of power lines, into respective bitstreams; a first register storing the bitstreams of the plurality of detection currents; a second register storing the bitstreams of the plurality of detection voltages; a register controller controlling the first register and the second register to sequentially output the bitstreams of the plurality of detection currents and the bitstreams of the plurality of detection voltages while simultaneously outputting bitstreams of detection currents and bitstreams of detection voltages detected in the same power line; a first decimation filter converting the bitstreams of the plurality of detection currents sequentially outputted from the first register into digital values; and a second decimation filter converting the bitstreams of the plurality of detection voltages sequentially outputted from the second register into digital values.

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