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A Method of the Improvement of Wireless Power Transfer (WPT) System Efficiency, Compatibility, EMI Reduction, and Foreign Object Detection (FOD) for EV Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
During the charging Electric Vehicle(EV), power transfer occurs in the power electronics of a EV powertrain. Understanding how the Wireless Power Transfer(WPT) occurs would be beneficial for achieving convenient charging method. This dissertation focuses on improving WPT system efficiency, compatibility, EMI reduction, and Foreign Object Detection(FOD). The choice of convertible WPT pad for circular and DD type coils, improvement of pad compatibility is analyzed in this thesis. In addition, several control methods of increasing WPT system efficiency are proposed. Firstly, the effect of Full Bridge – Half Bridge(FB-HB) is introduced, and the influence of a Bridgeless control scheme is discussed. A new, ferrite pad structure is applied to WPT system in order to achieve EMI reduction. Lastly, a new strategy of Foreign Object Detection(FOD) is suggested for WPT system using phase difference and frequency variation detection.