Compensation Capacitor Tuning Method of LCC-S Topology Wireless Power Transfer System to Implement ZVS under Various Conditions

Abstract

In this paper, a compensation capacitor tuning method is proposed to implement ZVS (Zero Voltage Switching) in the LCC-S topology wireless power transfer (WPT) system with various operating conditions. ZVS must always be realized to ensure stability and reduction of the inverter loss, which is a necessary circuit in the WPT system. As a structural feature of the WPT system, system characteristics can change during operation and affect ZVS. In WPT system design, it is crucial to design to always implement ZVS under various operating conditions. This paper presents the analysis of ZVS in the LCC-S topology WPT system and the compensation capacitor tuning method to realize ZVS. In addition, dead-time is considered to improve the accuracy of the proposed tuning method. The proposed method is verified through simulation results.