Maximum Energy Efficiency Tracking for Wireless Power Transfer Systems

TLDR

The paper proposes an automatic maximum‑energy‑efficiency tracking method for wireless power transfer systems. The method uses a switched‑mode converter at the receiver to emulate the optimal load and, by searching for the minimum input power that yields a desired output power on the transmitter side, tracks the maximum‑efficiency point without requiring receiver‑side feedback. Experimental tests on a two‑coil system under weak and strong coupling confirm the scheme’s feasibility.

Abstract

A method for automatic "maximum energy efficiency tracking" operation for wireless power transfer (WPT) systems is presented in this paper. Using the switched-mode converter in the receiver module to emulate the optimal load value, the proposed method follows the maximum energy efficiency operating points of a WPT system by searching for the minimum input power operating point for a given output power. Because the searching process is carried out on the transmitter side, the proposal does not require any wireless communication feedback from the receiver side. The control scheme has been successfully demonstrated in a two-coil system under both weak and strong magnetic coupling conditions. Experimental results are included to confirm its feasibility.