Hangzhou, China zpec@zju.edu.cn
Hangzhou, China zpec@zju.edu.cn
Advanced Inductive Power Transfer: From Fundamentals to Magnetics, Control, and System Topologies
With the development of technology, an enormous number of electronic devices are being put into the market, and these devices have led to an increasing demand for different battery charging methods. Wireless power transfer, especially inductive power transfer (IPT), has been an emerging technology and has shown great potential in lots of applications throughout the decade. IPT systems allow power to be transferred through a magnetic field, which enables wireless charging to replenish electronic devices over a distance and is able to overcome the shortcomings of clumsy wiring and risk of electric shock when using wired charging, it can achieve fully automatic charging.
However, practical implementation faces critical barriers, including coupler misalignment, converter architecture optimization, and control strategy implementation. This tutorial addresses these challenges by exploring key technical issues in wireless charging, elaborating fundamental IPT principles, and proposing innovative ideas for discussion. We will cover the following topics:
1) Fundamentals of inductive power transfer: We will give an overview of inductive power transfer, including some development history, basic magnetic coupler structures, compensation circuits, output characteristics, and theoretical analysis.
2) Control strategies for efficient wireless charging: We will present effective control strategies for wireless charging, focusing on static wireless EV charging with a wide range and optimal efficiency, analyzing how dual-side control strategies between primary inverters and secondary active rectifiers can optimize impedance matching.
3) Misalignment tolerant magnetic coupler: The magnetic coupler is one of the key factors that determine the transmission efficiency of an IPT system. In this section, we will present our research findings regarding the design of magnetic couplers in various application scenarios. Moreover, we will concentrate on analyzing the various unique misalignment problems, along with the specific effects of these misalignments on system performance.
4) Wireless integrated on-board charger (WiOBC) based on partial power conversion (PPC): We will explore advanced architectures for WiOBC that simultaneously handle multiple charging tasks with enhanced efficiency, paired up with effective control strategies for wireless charging by achieving PPC.
5) Wrap up and discussion: Finally, we will summarize key points and provide a glimpse into the future outlook.
Chi-Fong Ieong
University of Macau
Chi-Fong Ieong (Member, IEEE) received the B.Sc. and Ph.D. degrees in electrical and computer engineering from the University of Macau (UM), Macau, China, in 2021 and 2025, respectively. He is currently a Postdoctoral Fellow with the State Key Laboratory of Analog and Mixed-Signal VLSI and the Institute of Microelectronics, UM. His research focuses on power electronics and wireless power transfer. During his doctoral studies, he conducted in-depth research on the design of high-efficiency inductive wireless battery charging and power transfer systems for a wide range of applications. Over this period, he authored 7 high-quality journal papers (4 of which as first author) and 5 conference papers. In July 2025, he successfully defended his Ph.D. dissertation titled "Inductive Power Transfer System Designs for Efficient Wireless Battery Charging in Diverse Applications."
Muxing Wu
University of Macau
Muxing Wu (Student Member, IEEE) received the B.Sc. degree in electrical and intelligent engineering in 2018 from Xiangtan University, Xiangtan, China, the M.Sc. degree in electrical engineering from Yanshan University, Qinhuangdao, China, and the Ph.D. degree in electrical and computer engineering from the University of Macau (UM), Macau, China, in 2026. He is currently a Research Assistant with the State Key Laboratory of Analog and Mixed-Signal VLSI and the Institute of Microelectronics, UM. His current research interests include wireless power transfer and resonant converter.
Chi-Seng Lam
University of Macau
Chi-Seng Lam (Senior Member, IEEE) received the Ph.D. degree in electrical and electronics engineering from the University of Cambridge, Cambridge, U.K., in 2019. In 2013, he was a Postdoctoral Fellow with The Hong Kong Polytechnic University, Hong Kong, China. He is currently a Full Professor, UM. He has co-authored or co-edited five books and 220+ technical journals and conference papers. He holds six U.S. and nine Chinese patents. His research interests include power quality compensators, power management ICs, wireless power transfer, and solar energy systems. He has delivered 7 tutorials at IEEE Conferences [IECON2025, IECON2024, IPEMC2024-ECCE Asia, PEDG2023, ISCAS2021, IECON2020, APPEEC2019]. Prof. Lam currently serves as an Associate Editor for TPEL, TIE, JESTPE, TCAS-I, OJES. He was awarded 2024 TIE Outstanding Associate Editor, 2022 and 2024 TIE Distinguished Reviewer, 2024 TPEL Outstanding Reviewer.
Outline and Schedule (3-hour duration)
| Duration | Topic | Presenter |
|---|---|---|
| 40 min | 1. Fundamentals of Wireless Power Transfer | Chi-Fong Ieong |
| 30 min | 2. Control Strategies of IPT Based Converters for Efficient Charging | Chi-Seng Lam |
| 40 min | 3. Misalignment-Tolerant Magnetic Coupler for Various Applications | Chi-Fong Ieong |
| 40 min | 4. Wireless Integrated On-Board Charger (WiOBC) | Muxing Wu |
| 10 min | 5. Wrap Up and Discussions | Chi-Fong Ieong, Muxing Wu, Chi-Seng Lam |
1. Fundamentals of Wireless Power Transfer (Chi-Fong Ieong, 40 min)
2. Control Strategies of IPT Based Converters for Efficient Charging (Chi-Seng Lam, 30 min)
3. Misalignment-Tolerant Magnetic Coupler for Various Applications (Chi-Fong Ieong, 40 min)
4. Wireless Integrated On-Board Charger (WiOBC) (Muxing Wu, 40 min)
5. Wrap Up and Discussions (10 min)
Finally, we will wrap up the tutorial in the last part, summarizing key points, highlighting contributions to wireless charging system developments, and providing a glimpse into future research trends and outlook.
