A Three-Phase Overlapping WindingBased Wireless Charging System for Transportation Applications

This article proposes a two-layer overlapping winding-based three-phase wireless vehicle charging system with a coil span of 180 degrees. This coil structure offers higher coupling and balance inductance matrices between the transmitter and receiver and improves system efficiency. The system performance improvement has been validated through detailed analysis and simulation results and compared with the benchmark for the same electrical parameters, air gap, and coil volume. Finite element analysis-based simulation results were presented for a 7.7-kW wireless power transfer (WPT) over a 200-mm air gap. An experimental prototype of the proposed system is developed operating at the resonant frequency of 86 kHz with a 200-mm air gap between the coils to validate the design. Both the simulation and experimental results showed a significant increase in efficiency and coupling compared to the conventional WPT systems.