A Single-Stage Boost-Derived Universal Wireless Charging System for Electric Vehicles

Abstract

This article proposes a novel single-phase, single-stage boost-derived universal wireless charging (UWC) system which works with universal (AC/DC) inputs. The single-stage wireless charging (WC) conversion is more economical and efficient than the conventional two-stage conversion. Realizing a good power factor and THD is challenging with conventional two-stage WC systems due to the front-end buck-derived configurations. Additionally, single-stage WCs based on matrix converters (MCs) are also reported; however, the absence of DC-link capacitance affects the secondary side current by double-line frequency ripples, and a higher number of switch counts prevents MCs from taking the forefront in single-stage conversion for WCs. In order to address the problems mentioned earlier, this article reports a unique single-stage boost-derived configuration that integrates a full-bridge inverter and a synchronous boost converter. The design can execute the two operations concurrently as it has one common high-frequency leg to optimize switch utilization. The proposed system can work in two different modes: (a) grid-to-vehicle (G2V) mode and (b) solar-to-vehicle (S2V) mode. The steady-state analysis, operating modes, simulation, experimental results, and comparative analysis between existing relevant literature and closed-loop control are presented in detail. Moreover, a down-scaled laboratory prototype is built to attest to the analysis and performance of the proposed work.