Investigation of wireless power transfer system with spaced arranged primary H-shaped core coils for moving EVs

As a solution for long charging time and short running range of EVs, research on wireless power transfer systems for moving EVs have been getting attention. Although several power transfer systems with single or multiple grounded coils have been proposed, those systems have difficulties in maintenance, and require high system implementation and maintenance cost. In this paper, we evaluate the performance of a proposed wireless power transfer system for moving EVs, composed by a row of evenly spaced H-shaped core coils. With two types of resonance circuit, SP and SS topology, the performance of the system is evaluated under a constant voltage operation and a constant current operation. Comparison of the performance of the system with each resonance circuit in each operation is presented from the aspect of power output, efficiency and power factor. Among all experiment cases, power transfer with average transformer efficiency above 85% is achieved.