1.7 kW 6.78 MHz Wireless Power Transfer with Air-Core Coils at 95.7% DC-DC Efficiency

This paper describes the design and implementation of a 1.7 kW wireless power transfer system that operates at 6.78 MHz and uses low-cost air-core coils. The demonstration achieves a dc-dc efficiency of 95.7% at 1.7 kW and maintains above 93% efficiency between 100 W and 1.7 kW.