Misalignment-Tolerant Integration for S-$LCC$-Compensated WPT Systems: A Complementary-Coupling Compact Receiver

This article proposes a complementary-coupling compact receiver (RX) solution for an series–inductor–capacitor–capacitor-compensated wireless power transfer (WPT) system to tolerate the misalignment. To this end, a RX coil formed by four series L-shaped coils is proposed and integrated into the compensation (CX) coil. As a result, the mutual inductances (MIs) between the RX and transmitter (TX) coils, and between the CX and TX coils exhibit opposite gain trends relative to misalignment, providing the complementary MI to achieve a stable MI under misalignment. A design method for the CX parameters to achieve zero-phase-angle input and load-independent constant current (CC) output is presented based on the T-model. A WPT platform with the proposed method is built and the experimental results show that the system delivers 318 W with a dc–dc efficiency of 91.14%. Furthermore, the system tolerates $\pm$ 120 mm horizontal misalignment and $\pm$ 30 mm vertical misalignment with ZPA input and load-independent CC output as the load varies from 20 to 50 $\Omega$ .