Active Segmentation at 100 MHz for 12 W VHF Wireless Power Transfer

Power and efficiency dramatically decrease for magnetically-coupled wireless power transfer with small receivers at long distances. In this paper, we show through analysis that operating at VHF (very-high-frequency) using GaN HEMTs together with an air-core inductor that is segmented with each segment driven actively results in compelling improvements in comparison to other methods. An active segmented transmitter using current-mode class D primitive converters was demonstrated to operate at 100 MHz and 12 W in a wireless power transfer system.