A Misalignment-Insensitive Dual-Channel Electric Vehicle Wireless Charging System with a Novel Antiparallel Cross-Shaped Solenoid Pad

The electric vehicle wireless charging (EVWC) system needs to maintain stable output even when the coil offset occurs. In this paper, a combination of a square coil and a novel cross-shaped solenoid pad with antiparallel windings is proposed. The former is used to pick up the vertical magnetic flux, and the latter is to receive the horizontal magnetic $\mathbf{flux}$ generated in the offset case to compensate for the decrease in the vertical magnetic flux. A dual-channel inductor-capacitor-capacitor-series (LCC-S) topology with series connected diode rectifiers is utilized to form two energy transfer paths with opposite misalignment characteristics to achieve a stable output. The proposed magnetic couplers can achieve a smooth mutual inductance fluctuation in the horizontal $X$ and $Y$ directions. The fluctuation of the equivalent total mutual inductance is 4.39% from $-210$ mm to 210 mm (52.5% of the pad size) in both directions. The experimental results show that within the 52.5% offset range of the pad size, the output voltage fluctuates by only 4.72%.