An Interoperable Electric Vehicle Wireless Charging System Based on Mutually Spliced Double-D Coil

Interoperability and misalignment tolerance issues are two urgent problems to be solved in electric vehicles wireless charging systems. To address these issues, a wireless power transfer (WPT) system based on decoupled mutually spliced double-D (DD) receiving coils is proposed in this article, which can achieve certain interoperability and antimisalignment performance. These two receiving coils are connected in series via the rectifiers on the dc side, resulting in the total equivalent mutual inductance equal to the sum of the absolute values of the mutual inductances between the transmitting coil and the two receiving coils. Compared with existing works, the proposed WPT system can achieve interoperability and misalignment tolerance with different transmitting coils: the square coil, the DD coil along the X- or Y -directions, and the quadrupole coil. A mathematical model and an experimental prototype are developed to verify the effectiveness of the proposed scheme, and the highest efficiency of the experimental prototype is 92.49%.