Kiel Nano, Surface and Interface Science (KiNSIS)

Prof. Chengbin Ma (Michigan): Modeling, Design, and Control of Megahertz Wireless Power Systems

31.10.2016 von 17:15 bis 18:45

Technische Fakultät, Institut für Elektrotechnik und Informationstechnik, Kaiserstr. 2, Kiel, Raum: "Aquarium", Geb. D


Modeling, Design, and Control of Megahertz Wireless Power Systems



A high level of spatial freedom makes wireless power transfer (WPT) working at several megahertz (MHz) attractive for charging various electronic devices. However, the operation in the MHz frequency band presents technical challenges due to the potentially increased power losses, strong nonlinearities of the devices, and electromagnetic interference (EMI) problem. Both a circuit- and a system-level analyses are important to derive requirements for a high overall system performance such as efficiency and harmonics suppression. Besides, unavoidable uncertainties in a real WPT system require either a feedback mechanism or improved design to enhance the robustness. This presentation reviews the activities on MHz WPT conducted by our group, particularly at the modeling, design, and control aspects. First the challenges from the MHz WPT are summarized and explained. Then the feedback-based approaches are developed to actively improve the robustness of the WPT system when there are variations in the coil relative position and final load, the two major sources of uncertainties. The Class E power amplifier (PA) and rectifier are further introduced into the MHz WPT systems, which help to improve the efficiency thanks to the soft-switching properties of the PA and rectifier. They also make the analytical derivations possible that facilitate the optimization-based designs. Finally, the initial efforts on the multi-receiver MHz WPT systems are mentioned such as design of a current-mode Class E PA, analysis and compensation of cross coupling, and impedance matching under a varying loading condition. For details, please refer to our publications [LINK].

Professor Chengbin Ma

received the B.S.E.E. degree (Hons.) from East China University of Science and Technology, Shanghai, China, in 1997, and the M.S. and Ph.D. degrees in electrical engineering from The University of Tokyo, Tokyo, Japan, in 2001 and 2004, respectively. From 2004 to 2006, he was a R&D Researcher with the Servo Motor Laboratory, FANUC Ltd., Oshino-mura, Yamanashi Prefecture, Japan. Between 2006 and 2008, he was a Postdoctoral Researcher with the Department of Mechanical and Aeronautical Engineering, University of California, Davis.

He is now an Assistant Professor of electrical and computer engineering with the University of Michigan–Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai and has a joint faculty appointment with School of Mechanical Engineering, Shanghai Jiao Tong University. His research interests include battery/energy management, wireless power transfer, mechatronic control, and applications in electric vehicles, microgrids, and smartgrids.

Dr. Ma is a member of The Institute of Electrical and Electronics Engineers and a vice chair of Energy Storage Technical Committee, IEEE Industrial Electronics Society (email:; web:

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