Active Controlled Resonant-Tank Techniques in WPT Systems for Enhancing Misalignment Tolerance, Stability, and Transfer Efficiency

This study introduces a novel wireless power transfer (WPT) system that employs Resonant-Tank Active Control techniques—specifically, variable inductor (VI) and variable capacitor (VC)—to achieve load-independent output voltage. Theoretical derivations and numerical analysis are conducted to evaluate the system’s stability. VI and VC techniques are seamlessly integrated to enhance misalignment tolerance and ensure consistent voltage gain. The analysis and results demonstrate that adjusting the VI and VC resonant-tank parameters enables stable output voltage and flat conversion efficiency curve, even under significant variations in the coupling coefficient, all without the need for complex control mechanisms. Finally, a LCC-S compensated WPT system is verified as a case study.