RPG Seminar – Analysis and Performance Enhancement of Wireless Power Transfer Systems with Intended Metallic Objects
12 Mar, 2021 (Fri)
3:00 pm
Webinar Link:

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Ms. Hui Wen Rebecca Liang
Department of Electrical and Electronic Engineering
The University of Hong Kong


While detection of foreign or unintended metallic objects is an important topic for wireless power transfer (WPT), operation of WPT systems with intended metallic objects is largely an unchartered territory.  This paper presents a methodology for analyzing the effects of intended metallic object on a WPT system through the study of the magnetic field distribution and the use of a reduced-order equivalent model of the systems for comparing the WPT system with and without the metallic object. The methodology is applied to a metallic corona ring of low resistance used with a WPT system. The analysis quantifies how an intended metallic object could change the magnetic coupling between the transmitter and receiver coils, and alter the equivalent resonant tank parameters of the WPT system. Re-compensation of the resonant tank can only enhance the power transfer capability but not the energy efficiency. The theory and practical verification of a new performance-enhancement method based on a combination of (i) re-compensating the resonant tanks and (ii) maximizing the equivalent mutual inductance of the Tx and Rx coils is presented. Such methodology provides a general approach to analyze WPT systems with or without relay resonators in the presence of intended metallic objects.

Zoom Link (during COVID-19 special period):
Meeting ID: 960 7881 9801
Password: 793361

Biography of the speaker:
H. W. Rebecca
Liang received her B.S. and M.S. degrees in Electrical and Electronic Engineering from National Cheng Kung University, Taiwan in 2013 and 2015, respectively. In 2015-2017, she worked as an analog circuit engineer at Chroma ATE (Advanced Technology Research Center), Taiwan. She is currently working towards a PhD at the University of Hong Kong. Her research interests include power electronics, wireless power transfer, dc-dc power converter, and renewable energy conversion.

All are welcome.


Prof. S. Y. Ron Hui

Most seminars are open to the general public, free of charge, unless otherwise stated. Registration is not required. Arrangement for car parking facilities on campus please contact us for details.

For enquiries, please contact:
Department of Electrical and Electronic Engineering,
Room 601, Chow Yei Ching Building,
Pokfulam Road, Hong Kong
Tel: (852) 3917 7093
Email: seminar@eee.hku.hk