Development of front-end monitoring of mutual coupling and load conditions in wireless power transfer systems

Abstract

A conventional series-series (SS)-compensated wireless power transfer (WPT) system generally comprises a DC-DC regulator at the user-end for the battery charging, which will deteriorate the dynamic response and efficiency of the system. To address this issue, maximum efficiency tracking control methods based on direct communication feedback signals from the receiver to the transmitter are designed to estimate the coupling coefficient and load conditions. However, wireless communication systems can increase both cost and volume of the WPT system. Therefore, several primary-side monitoring strategies are proposed in recent years. This paper covers main content of the tutorial that is presented in 8th PESA, in which the development of front-end monitoring strategies from the Wireless Power Research Group of the University of Hong Kong are described.