Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Single-Stage AC/DC Converter for Wireless Power Transfer Operating With Robustness in Wide Air Gaps
Authors Jeong-Won Woo ; Ki-Chan Jang ; Min-Ji Kim ; Eun-Soo Kim
DOI 10.6113/TKPE.2021.26.2.141
Page pp.141-149
ISSN 1229-2214
Keywords WPT (Wireless Power Transfer); Single stage AC/DC converter; Series-series compensation circuit
Abstract In the field of electric vehicles and AGVs, wireless power transfer (WPT) charging systems have been developed recently because of its convenience, reliability, and positive environmental impact due to cable and cord elimination. In this study, we propose a WPT charging system using a single stage AC-DC converter that can be reduced in size and weight and thus can ensure convenience. The proposed single-stage AC-DC converter can control a wide output voltage (36-54 VDC) within coupling ranges by using the variable link voltage applied to the WPT resonant circuit through phase-shifted modulation at a fixed switching frequency. Moreover, the input power factor and total harmonic distortion can be improved by using the proposed converter. A 1 kW prototype that can operate with an air gap range of 40-50 mm is fabricated and validated through experimental results and analysis.