A Single-Stage Power-Conversion AC-DC Wireless Power Transfer System with Bridgeless Power Factor Correction Rectifier and Resonant Inductive Coupling

This paper presents a single-stage AC–DC wireless power transfer (WPT) topology that combines a bridgeless power factor correction (PFC) rectifier with resonant inductive coupling. The proposed design aims to achieve higher efficiency and a more simplified architecture relative to conventional multi-stage systems. In the conventional AC-DC WPT systems, the power conversion typically requires AC-DC stage and WPT stages, which leads to inherent losses and increased complexity. In contrast, the proposed single-stage power-conversion circuit combines both PFC rectifier and WPT into a single-stage system, and thus reducing conversion losses and system size. The circuit employs resonant inductive coupling to achieve higher energy transfer efficiency. The analysis of the circuit’s design, performance, and operating principles is provided. A 200 W prototype was developed to benchmark the converter’s performance. The proposed single-stage AC-DC WPT architecture is thus proven to be a compelling alternative, successfully addressing the dual constraints of efficiency and complexity inherent in multi-stage systems.