Inventors of the Month - March 2016

This article was posted on: March 14, 2016

Fred C. Lee, Qiang Li, Junjie Feng

Wireless Charging Bowl

The Office of the Vice President for Research and Innovation recognizes Fred C. Lee, Qiang Li, and Junjie Feng as Inventors of the Month for March 2016 for their invention, “Omnidirectional Wireless Power Transfer System,” disclosed to Virginia Tech Intellectual Properties Inc.

Wireless Charging BowlWireless power transfer has been studied intensely in recent years as a method of charging such devices as portable consumer electronics, soldiers’ electronic equipment, implanted medical devices, and electric vehicles. These Virginia Tech inventors have improved upon the limitations of existing wireless charging technologies with the invention of a novel, well-designed, omnidirectional wireless charging bowl based on a concept of coil arrangement and flexible excitation methods.

Portable devices, no matter how big or small, can be placed facing any direction in the Virginia Tech wireless charging bowl. Omnidirectional flux induced by flexible excitation charges the devices efficiently, regardless of alignment. This technology is meaningful for the development of other wireless charging products, and is highly attractive for applications in the era of what’s known as the Internet of Things.


Fred Lee is a University Distinguished Professor in the Bradley Department of Electrical and Computer Engineering (ECE), and founder and director of the National Science Foundation Engineering Research Center for Power Electronics Systems (CPES), a preeminent academic center in power electronics research at Virginia Tech. Lee’s research interests include high-frequency power conversion, magnetics and electro-magnetic interference, distributed power systems, renewable energy, power quality, high-density electronics packaging and integration, and modeling and control. He holds 77 U.S. patents and has published 281 journal articles and 691 refereed technical papers. During his tenure at Virginia Tech, Lee has supervised to completion 80 Ph.D. and 89 master’s degree students. According to Microsoft H index, Lee is rated among the top three best-cited authors among 2.5 million engineering authors in the world.

Fred Lee

Qiang Li is an assistant professor of electrical and computer engineering in ECE and a CPES faculty member. Li’s research interests include high-density electronics packaging and integration, high-frequency magnetic components, high-frequency power conversion, and distributed power systems.

Qiang Li

Junjie Feng is a graduate student in the second year of his Ph.D program in ECE. .He is working on wireless power transfer projects at CPES.

Junjie Feng

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