Foreign object detection in wireless power transfer systems
Chris Mi, San Diego State University, USA
Abstract: Wireless power transfer (WPT) technology has been developed for the wireless charging of electric vehicles, consumer electronics, and other applications. Inductive power transfer (IPT) uses magnetic field for power transfer and it is currently the most popular and mature WPT technology. However, the strong magnetic field will heat up metal objects falling in the charging area due to eddy currents generated in the objects. It can also harm animals or toddlers staying in the charging area. To deal with these issues, foreign object detection (FOD), including metal object detection (MOD) and living object detection (LOD), should be developed for the safe operation of IPT systems. FOD can be divided into system parameter detection methods, wave-based detection methods, and field-based detection methods. System parameter detection methods are normally used in low-power systems for MOD. Wave-based detection methods are suitable for high-power applications, for both MOD and LOD. Field-based detection methods work for both high-power and low-power applications, for both MOD (in an inductive way) and LOD (in a capacitive way). This presentation first reviews and summarizes the state-of-the-art development of FOD technology in IPT systems. Then, a novel detection coil layout is proposed to not only cover the whole charging area but also decouple from the transmitter and receiver to minimize the impacts on power transfer. A mixed resonant circuit will be explained which will have better performance than the parallel resonant circuit. The impacts of the detection coil layer, turn number, trace width, and the capacitance ratio in the mixed resonant circuit will be discussed.
Biography: Chris Mi is a fellow of IEEE and SAE, Professor and Chair of the Department of Electrical and Computer Engineering, and the Director of the US DOE funded GATE Center for Electric Drive Transportation at San Diego State University, San Diego, California, USA. He was previously a professor at the University of Michigan, Dearborn from 2001 to 2015. He received the B.S. and M.S. degrees from Northwestern Polytechnical University, Xi’an, China, and the Ph.D. degree from the University of Toronto, Toronto, Canada, all in electrical engineering. Previously he was an Electrical Engineer with General Electric Canada Inc. He was the President and the Chief Technical Officer of 1Power Solutions, Inc. from 2008 to 2011. He is the Co-Founder of SNC Technology. His research interests are in electric and hybrid vehicles. He has taught tutorials and seminars on the subject of HEVs/PHEVs for the Society of Automotive Engineers (SAE), the IEEE, workshops sponsored by the National Science Foundation (NSF), and the National Society of Professional Engineers. He has delivered courses to major automotive OEMs and suppliers, including GM, Ford, Chrysler, Honda, Hyundai, Tyco Electronics, A&D Technology, Johnson Controls, Quantum Technology, Delphi, and the European Ph.D School. He has offered tutorials in many countries, including the U.S., China, Korea, Singapore, Italy, France, and Mexico. He has published more than 300 articles and delivered more than 100 invited talks and keynote speeches and as a panelist in major IEEE and SAE conferences. Dr. Mi is the recipient of “Distinguished Teaching Award” and “Distinguished Research Award” of University of Michigan Dearborn. He is a recipient of the 2007 IEEE Region 4 “Outstanding Engineer Award,” “IEEE Southeastern Michigan Section Outstanding Professional Award.” and the “SAE Environmental Excellence in Transportation (E2T) Award.” He was also a recipient of the National Innovation Award and the Government Special Allowance Award from the China Central Government. He received three Best Paper Awards from IEEE Transactions on Power Electronics and two Power Electronics Prize Letter Award. In 2019, he received the IEEE Power Electronics Emerging Technology Award. Dr. Mi was the Chair (2008-2009) and Vice Chair (2006-2007) of the IEEE Southeastern Michigan Section. Dr. Mi was the general Chair of the 5th IEEE Vehicle Power and Propulsion Conference held in Dearborn, Michigan, USA in September 6-11, 2009. Dr. Mi is one of the three Area Editors of the Editor of IEEE Transactions on Vehicular Technology, associate editor of IEEE Transactions on Power Electronics, Associate Editor of IEEE Transactions on Industry Applications. He served on the review panel for the NSF, the U.S. Department of Energy (2007–2010), the Natural Sciences and Engineering Research Council of Canada (2010), Hong Kong Research Grants Council, French Centre National de la Recherche Scientifique, Agency for Innovation by Science and Technology in Flanders (Belgium), and the Danish Research Council. He is the topic chair for the 2011 IEEE International Future Energy Challenge, and the General Chair for the 2013 IEEE International Future Energy Challenge. Dr. Chris Mi is a Distinguished Lecturer (DL) of the IEEE Vehicular Technology Society. He is Guest Editor-in-Chief of IEEE Journal of Emerging and Selected Topics in Power Electronics – Special Issue on WPT, Guest Co-Editor-in-Chief of IEEE Transactions on Power Electronics Special Issue on WPT, Guest Editor of IEEE Transactions on Industrial Electronics – Special Issue on dynamic wireless power transfer, and steering committee member of the IEEE Transportation Electrification Conference (ITEC- Asian). He is Program Chair or General Chair of a number of international conferences, including Workshop on Wireless Power Transfer (WoW), IEEE International Electric Vehicle Conference (IEVC), and IEEE International Transportation Electrification Conference – Asia-Pacific. He is also the chair for the IEEE Future Direction’s Transportation Electrification Initiative (TEI) e-Learning Committee and developed an e-learning module on wireless power transfer.
Technical challenges of wireless power transfer for Smart Grid Applications
Ron Hui, University of Hong Kong and Imperial College London
Abstract: Wireless power transfer (WPT) has been widely adopted in consumer electronics market and is anticipated to enter the electric vehicle market in the near future. Besides these two application areas, WPT is being considered by industry for many new applications. This keynote speech will address new WPT applications in emerging smart grid which requires increasing number of sensors and monitoring equipment. In particular, the speaker will address technical challenges in a combined energy harvesting and WPT insulation rod system used in high-voltage transmission towers. These challenges include printed coil-resonator and overall system modeling methods, optimal system design, efficiency enhancement and operation in the presence of metallic objects. Finally, the speaker will highlight the potential of using large-scale WPT infrastructure for electric vehicles as a new Smart Grid device to stabilize emerging smart power grid with increasing penetration of renewable energy sources of intermittent nature. This new initiative can potentially accelerate the adoptions of electric vehicles and renewable energy as a complementary solution to combat climate change.
Biography: Prof. Ron Hui obtained his Ph.D at Imperial College London in 1987. He has previously academic positions in the U.K. and Australia. Since 2011, he has been Chair Professor of Power Electronics at both of the University of Hong Kong and Imperial College London. He has published over 450 research papers including 280 refereed journal papers. Over 60 of his patents have been adopted by industry, leading to royalty income exceeding US$ 4.5 M. His inventions in Wireless Power led to the formation of Wireless Power Consortium (WPC) in 2008, and underpin key dimensions of the world’s first wireless charging standard “Qi” launched by WPC in 2010, with free-positioning, localized charging and compatibility check features. By 2020, WPC has over 550 company members including Apple, Samsung and Qualcomm. He also pioneered the Photo-Electro-Thermal theory for LED systems that unifies heat, light, power and colour in one framework. His invention on passive LED street lighting systems is now used in over 20 countries. He invented Electric Spring technology, which is the fastest demand-side management technology for smart grid applications. He is the recipient of the 2010 IET Achievement Medal (Crompton Medal) and 2015 IEEE Technical Field Award (IEEE William Newell Power Electronics Award). He is a Fellow of the IEEE, Australian Academy of Technology and Engineering, US Academy of Inventors and Royal Academy of Engineering, UK.