A three-phase WPT system with self-regulation of phase sequence

For purpose of realizing stable and optimum power transfer efficiency, a three-phase magnetic coupled resonant wireless power transfer (WPT) scheme is proposed, including considerations about how to design the structure of the transmission coils based on the parity-time-symmetry principle. Simulations show that, when the coupling coefficient changes from 0.15 to 0.35, the efficiency of the proposed system can be maintained at a high level, i.e. more than 80%. Besides, the proposed scheme can automatically tune the phase sequence without any additional feedback loop components, thereby simplifying the circuit structure.