Parameter and Topology Optimizations for Wireless Power Transfer Device Considering Magnetic and Circuit Properties

This article proposes a novel optimization method to design the transmitting and receiving coils of a wireless power transfer (WPT) device considering its magnetic and circuit properties. In the proposed optimization, the coil shapes are determined by parameter optimization (PO) for manufacturability, whereas the magnetic core shapes introduced near them are determined by topology optimization (TO). The power transfer efficiencies of the optimized WPT device are evaluated using the SPICE simulation considering the coupling with an electronic circuit. The circuit parameters of the optimized coils are computed using the homogenization-based finite element method (FEM), which can effectively evaluate the eddy current loss in the coil windings. It is shown that the optimized WPT device has a power transfer efficiency higher than 90% even when there is a misalignment.