In recent years, the Wireless Power Transfer (WPT) system has become more and more popular due to its prominent advantages, especially for Electrical Vehicle (EV) charging. The WPT systems are required to follow the EV battery charging profiles, thus more and more voltage control methods with distinctive characteristics are proposed and studied. The goal of this thesis report is to conduct a comprehensive benchmark of the front-end voltage control solutions.

This thesis report focuses on the front-end voltage control solutions including the front-end buck converter and the phase shift control based on the primary inverter. Six different front-end voltage control scenarios are designed and compared in terms of system efficiency. There are four scenarios of the front-end buck converters including the single-phase buck converter working in Continuous Conduction Mode (CCM), the single-phase buck converter working in Triangular Current Mode (TCM), the two-phase interleaved buck converter working in CCM and the two-phase interleaved buck converter working in TCM. There are also two scenarios of primary inverter-based phase shift controls including phase shift with and without phase delay. The single-phase buck converter working in TCM has the highest efficiency reaching 95.5% at a light load. The phase shift control scenario with phase delay has the highest efficiency exceeding 96.5% at a heavy load.

Different from previous research on phase shift control, this thesis report conducts an in-depth harmonic analysis and compares the accuracy of harmonics analysis with the accuracy of fundamental wave analysis. The conclusion not only proves that fundamental wave analysis is reliable and accurate enough to calculate the phase shift parameters for the S-S compensation but also improves the calculation accuracy at a light load by harmonics calibration.