Advanced Electric Power Conversion Laboratory

Name: Minfan Fu


School of Info. Science and Tech.

ShanghaiTech University

Room 534, SIST Building 3

393 Middle Huaxia Road

Pudong, Shanghai 201210

Tel: +86-021-20684455

Congratulations! A journal paper is accepted by JESTIE.

P. Zhao, G.Zheng, R. He,Y. Liu and M.Fu*, “A 45-W Two-Stage Wireless Fast Charger Using UnregulatedInductive Power Transfer", IEEEJournal of Emerging and Selected Topics in Industrial Electronics, early access.

Abstract: Most of the existing wirelessoff-line chargers would employ redundant power conversion and isolation stagesto charge a low-voltage battery, which leads to limited overall efficiency. Inorder to address the redundancy issue, this paper proposes a wireless fastcharger by using a two-stage configuration. An unregulated IPT stage can notonly offer galvanic isolation but also provide high step-down voltage ratio,and then only a simple buck converter is needed for voltage regulation. Thispaper evaluates the influence of voltage gain on efficiency and voltage stress ofa LCC-C compensated IPT stage. The ZVS lost mechanism is also studied andevaluated by a proposed ZVS model. Finally, a 45-W fast charger prototype isdesigned for 264V/12V conversion. The measured peak efficiency is 78%, which ismuch higher than the Qi-based charger.