Resonance Frequency Adjustment Using PWM-Controlled Variable Capacitor for In-Motion WPT with Circuit Parameter Deviations *

Abstract

In-motion wireless power transfer(WPT) is gathering attention as an effective way to provide power to electric vehicles. However, in practical use, circuit parameters deviate from nominal values due to manufacturing errors, preventing efficient and stable power transmission. The in-motion WPT system introduced in this paper actively adjusts to circuit parameter deviations using a PWM-controlled variable capacitor. This paper also proposes a variable capacitor which can be applied to in-motion WPT systems, and the validity of the proposed circuit is verified through experiment.