A Compact Receiving Side Circuit for Wireless Power Transfer with Foreign Object Detection Technique

Abstract

Wireless power transfer is a promising technology, it is used to overcome the problems of conductive power transfer. However, numerous challenges still face this technology, especially in security issues. Detecting any foreign object in the proximity of the transmitter will save power and secure the system from any possible dangers. In this paper, A compact semi-active rectifier is proposed to detect foreign objects by applying the proposed control technique without extra components and also to control the charging process of the supercapacitor efficiently. Two different modes are proposed in this work to optimize power consumption. The low-power mode is used in the case of no receiver in the power transfer range or when a foreign object is detected, so the primary side controller adjusts the input voltage of the system to optimize the power consumption. Otherwise, it works in the power transfer mode at the resonance frequency.