General Analysis and Implementation of Lateral Misalignment-Adaptive WPT Systems Based on Flux-Compensation Winding

Based on the system architecture with one flux-compensation winding which generates compensating fluxes on the receiving winding with respect to those generated by the main transmitting winding, a general theoretical analysis is provided aiming at lateral misalignment-adaptive characteristics. In the analysis, different compensating topologies are represented with a T-type or a pi-type network so that general derivations are possible. Various lateral misalignment-adaptive compensating topologies are found and summarized. With one of the possible topologies, detailed design is carried out and a 1 kW prototype is constructed for experimental verifications. The output current fluctuation of the prototype system is lower than 6% in a coupling coefficient range of 0.12-0.40 and a load resistance range of 5-20 Omega. In addition, zero-phase angle is realized in the whole coupling and load ranges.