Coil Geometry Modeling and Optimization for a Bidirectional Wireless Power Transfer System

Abstract:
The coil geometry and improvement of misalignment tolerance is a key challenge for the optimization of wireless power transfer (WPT) systems. In this paper a double-D shaped coil geometry is modeled and optimized for a bidirectional wireless power transfer system for electrical vehicles (EVs) with vehicle to grid (V2G) capabilities. With the new proposed winding configuration, the magnetic coupling is less sensitive to parking misalignments, which is useful for a highly efficient battery charging system. Further efforts to reduce the amount of ferrite material helps to lower the weight and cost of the system without affecting the performance. In order to verify the effect of the winding geometry experimentally, a 3.6 kW hardware prototype was built.