A high-precision broadband low-cost multiplier topology for electric energy measurement

The multiplier is an indispensable component of electronic energy meters, and is also the main source of energy metering errors. This paper quantitatively analyses the metering error of the conventional time-division multiplier in the presence of harmonics. The theoretical error expression is derived, which indicates that the error increases with the increase of harmonic order. To address the problem of inaccurate power metering under harmonic condition, this paper proposes a high-precision, wide-bandwidth, and low-cost multiplier topology. The accuracy of the multiplier in the presence of harmonics is successfully verified through theoretical derivation and simulation. Furthermore, an experimental prototype of the proposed high-precision broadband low-cost multiplier has been built to verify the simulation results, which supports the effectiveness of the proposed high-precision broadband low-cost multiplier in this paper.