An Impedance Mapping-Based T-Compensation Network and Control Strategy for WPT System with Full-Bridge Active Rectifier

For wireless power transfer (WPT) systems applied to electric vehicles, the dual-phase-shift (DPS) controlled full-bridge active rectifier (FBAR) is often utilized to extend the system regulation range to cover the wide coupling factor and black load range. In addition, zero-voltage switching (ZVS) is always desired to reduce switching losses and electromagnetic interference. However, the ZVS operation of DPS-controlled FBAR usually requires a non-zero input phase angle, which can result in the detuning of the secondary side with a conventional compensation network and impair the system performance. black This article proposes an impedance mapping-based T-compensation network (IMTCN) for the characteristics of FBAR. This IMTCN can minimize the reactive power demand on the secondary side while ensuring the ZVS of the FBAR. A DPS control strategy for FBAR adapted to the proposed IMTCN is also developed to optimize the system operation while achieving the rated power operation and ZVS of all power switches at all operating points. The experimental results demonstrate that the proposed IMTCN can improve the system efficiency at almost all operating points by up to 3.0\% compared to the system with a conventional LCC compensation network. Moreover, the proposed DPS control strategy can also effectively optimize the transfer performance.