Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 2, Pages 1244-1271Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3105689
Keywords
Wireless power transfer; Power measurement; Loss measurement; Transmitters; Receivers; Voltage measurement; Electric vehicles; Charging; diagnostics; electric vehicles (EVs); electromagnetic modeling; energy metering; Faraday coil; measurement; metering; non-contact sensors; power measurement; power metering; power transfer; Poynting vector; sense coil; transfer-power; wireless power transfer (WPT)
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This article presents a method called Faraday coil transfer-power measurement (FC-TPM) for accurately measuring wireless power transfer. The FC-TPM method measures the real power propagating through the air gap between transmitter and receiver coils. Fair metering incentivizes energy conservation and technological advancement.
Wireless power transfer (WPT) is emerging as the preeminent way to charge electric vehicles, but there appears to be no fair way to measure the power transfer. In this article, Faraday coil transfer-power measurement (FC-TPM) is presented. FC-TPM employs non-contact, open-circuited sense coils to measure the electromagnetic field from WPT and calculates the real power propagating through the air gap between the transmitter and receiver coils. What is measured is the real electromagnetic power, representing the pure dispensation of energy that unambiguously demarcates the losses on either side. FC-TPM was demonstrated to be 0.1% accurate in hardware over an Rx coil misalignment of up to 10 cm using a 1-kW WPT system. Fair metering incentivizes businesses and individuals to make choices that conserve energy and advance technology by providing more information and by properly assigning the financial loss. This article is accompanied by a video highlighting the essential contributions of this article.
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