Design of a Miniaturized High Frequency Wireless Power Transfer System

The salient features of high-frequency wireless power transfer (WPT) are miniaturization and better spatial freedom. But relatively, sensitivity issues make its design more complicated. At this time, the use of impedance compression technology becomes the key, and the high efficiency operation of the power amplifier (PA) is also crucial. In this paper, the parallel capacitor of the rectifier and the finite output inductance are used to realize the compression of reactive impedance, and at the same time ensure the zero-voltage turn-on (ZVS) of the PA. The proposed method is verified by simulation and experiments.