An Optimal Frequency Control Strategy for Wireless Power Transfer System to Achieve Maximum Energy Efficiency

For wireless power transfer (WPT) systems, maximizing efficiency across a wide load range and coupling conditions is a critical challenge. This paper introduces a novel optimal frequency control strategy designed to enhance the efficiency of WPT systems. The proposed method focuses on achieving both resistive and reactive equivalent load matching with the optimal operating frequency. To demonstrate the effectiveness of the proposal, a 48W WPT system is built in Simulink, and the performance of the proposed control method is evaluated with a load variation from 20% to 100% and a coupling factor variation from 0.1 to 0.3. Comparative analysis with the state-of-the-art control method shows significant efficiency improvements across a wide range of operating conditions.