A Frequency-Tracking Algorithm for Inductively Coupled Wireless Power Transfer Systems

Transmitting power through an air gap without any cable called as Wireless Power Transfer (WPT). Inductive Coupling is one of most preferred method for WPT. In this method, selection of the WPT circuit parameters is done according to the distance between coils. Therefore, changes in distance or medium has great effect on power transfer. In this paper an adaptive frequency tracking method is proposed to reduce the effect of distance or medium changes during recharging period. Proposed algorithm can track the maximum power transfer point with an acceptable efficiency. Advantages of the proposed algorithm has verified by the simulation results.