A New Adaptive Efficiency Control of the Transmitter with Remote Monitoring of the Receiver Load for 6.78 MHz Class Wireless Power Transfer

Abstract

Typically, the receiver of wireless power transfer (WPT) systems uses batteries for their energy storage. The power transfer efficiency depends on the load impedance of the battery, which varies according to the charging condition. The efficiency depends on the impedances of both the transmitter and receiver. However, for practical WPT systems, total load optimization is to be executed without directly monitoring the receiver load. This paper proposes a practical and effective method for an adaptive efficiency control of the transmitter with indirect monitoring of the receiver load.