Review Map of Comparative Designs for Wireless High-Power Transfer Systems in EV Applications: Maximum Efficiency, ZPA, and CC/CV Modes at Fixed Resonance Frequency Independent from Coupling Coefficient

This paper proposes a review map for comparative designs of wireless high-power transfer systems using single and double-resonance blocks. In-depth analyses and key guidelines are provided to design high-efficiency wireless high-power transfer systems (WHPTs) while keeping zero-phase-angle/unity power-factor property and constant-current/voltage supply to the load. Basic single-resonance LC circuits and a double-resonant block derived by combining 7 and -shaped blocks are analyzed. Then, resonant S- and T-Blocks are recommended as the best transmission blocks for competitive designs. The proposed approach is applied to map recent developments on the wireless charging technologies for electric vehicles (EVs), especially for weak-coupling systems and dynamic-charging technologies. The proposed design approach offers a systematic and effective methodology to quickly evaluate current technologies and solutions for WHPTs in EVs applications. In extension, this paper indicates different control strategies for WHPTs, especially for optimal-efficiency tracking. Design guidelines and control strategies are provided to achieve the maximum efficiency at a standard resonance-frequency against variations from loads and coupling-coefficients in operation which can easily map to recent research works and future research directions. Experimental verifications of dominant designs are also presented to validate the proposed approach.