Closed-Loop Control of Inductive WPT System Through Variable Inductor

Abstract

This paper introduces a novel control approach for an LCC-S Wireless Power Transfer (WPT) system. The system's output voltage regulation is achieved through a variable inductor, leveraging magnetic core saturation. A comprehensive design methodology for the variable inductor tailored to the desired control characteristics is presented. Addressing a significant gap in the current literature, the paper addresses the non-trivial challenge of developing a small signal model that correlates output voltage variations with changes in inductance. To fill this gap, the proposed approach pioneers a transfer function, providing an accurate description of this dynamic. Additionally, a closed-loop control system is proposed for prompt adjustment of the output voltage. The efficacy of this control system is demonstrated even in the face of rapid load variations or misalignment, ensuring reliable regulation. The robustness and effectiveness of the proposed approach are substantiated through extensive experimental measurements, validating the theoretical and simulation results.