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ADE7758, ATT7022B and MAXQ3180 are three kinds of Three-phase multifunctional energy metering IC. In the first place, this paper gives an introduction of the three chips on theory of operation. After that, particular contrast is carried out on performance. Finally, the conclusion is summarized. ADE7758 supplies per phase information, but it does not supply power-factor, phasor or three-phase information,...