Design and Multi-Objective Optimization of Coil and Magnetic for Wireless Power Transfer in Auxiliary Power Network

This paper proposes a coil and magnetic design and multi-objective optimization method for wireless power transfer in auxiliary power network for 10 kV SiC MOSFET based power electronics building block. This paper summarizes basic parameters extraction methods for coil to avoid time-consuming 3D FEA simulations during the optimization process. In addition, effect of magnetic shielding layer is also analyzed. Self- and mutual-inductance calculation using mirror method when magnetic shielding is applied are also given. Coil optimization process considering efficiency, isolation capacitance and insulation capability is given. A wireless power transfer converter prototype is built that features in 48 V to 48 V conversion, 100 W, 92 % efficiency, 4pF isolation capacitance, and 24 kV insulation voltage to validate the optimization result.