Optimization of foil conductor layout in inductive power transfer system resonators

Proper use of winding area and conductor layout in resonating coils of Inductive Power Transfer (IPT) systems is of great importance to achieve high efficient systems. In this paper a simple adaptable analytical method is investigated that can be implemented on variety of coil layout optimization problems to increase the resonator performance and the system efficiency. The method is frequency independent and overcomes the difficulties associated with the prediction of high frequency field distributions in IPT systems. In this study the procedure is applied to optimize a one-turn circular foil resonator operating at 13.56 MHz, with the Finite Element (FE) results showing of up to 30% increase in resonator quality factor and 1.73% increase in link efficiency of the IPT system.