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23Years (2004-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications23 April 2014 in IEEE Journal of Emerging and Selected Topics in Power Electronics
Journal Article
SLSiqi Li
Siqi Li
Chris MiWireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires. In fact, the WPT adopts the same basic theory which has already been developed for at least 30 years with the term inductive power transfer. WPT technology is developing rapidly in recent years. At kilowatts power level, the transfer distance increases from several millimeters to several hundred millimeters with a grid to load efficiency above 90%. The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios. This paper reviewed the technologies in the WPT area applicable to EV wireless charging. By introducing WPT in EVs, the obstacles of charging time, range, and cost can be easily mitigated. Battery technology is no longer relevant in the mass market penetration of EVs. It is hoped that researchers could be encouraged by the state-of-the-art achievements, and push forward the further development of WPT as well as the expansion of EV.
12 August 2014 in IEEE Transactions on Vehicular Technology
Journal Article
SLSiqi Li
Siqi Li
WLWeihan Li
Weihan Li
JDJunjun Deng
Junjun Deng
TNTrong Duy Nguyen
Trong Duy Nguyen
Chris MiThis paper proposes a double-sided LCC compensation network and its tuning method for wireless power transfer (WPT). With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency. Analysis in frequency domain is given to show the characteristics of the proposed method. We also propose a method to tune the network to realize zero voltage switching (ZVS) for the Primary-side switches. Simulation and experimental results verified analysis and validity of the proposed compensation network and the tuning method. A wireless charging system with output power of up to 7.7 kW for electric vehicles was built, and 96% efficiency from dc power source to battery load is achieved.
9 December 2008 in IEEE Transactions on Power Electronics
Journal Article
HBHua Bai
Hua Bai
Chris MiThis paper proposes a novel dual-phase-shift (DPS) control strategy for a dual-active-bridge isolated bidirectional DC-DC converter. The proposed DPS control consists of a phase shift between the primary and secondary voltages of the isolation transformer, and a phase shift between the gate signals of the diagonal switches of each H-bridge. Simulation on a 600-V/5-kW prototype shows that the DPS control has excellent dynamic and static performance compared to the traditional phase-shift control (single phase shift). In this paper, the concept of ldquoreactive powerrdquo is defined, and the corresponding equations are derived for isolated bidirectional DC-DC converters. It is shown that the reactive power in traditional phase-shift control is inherent, and is the main factor contributing to large peak current and large system loss. The DPS control can eliminate reactive power in isolated bidirectional DC-DC converters. In addition, the DPS control can decrease the peak inrush current and steady-state current, improve system efficiency, increase system power capability (by 33%), and minimize the output capacitance as compared to the traditional phase-shift control. The soft-switching range and the influence of short-time-scale factors, such as deadband and system-level safe operation area, are also discussed in detail. Under certain operation conditions, deadband compensation can be implemented easily in the DPS control without a current sensor.
8 July 2015 in IEEE Transactions on Vehicular Technology
Journal Article
WZWei Zhang
Wei Zhang
Chris MiWireless power transfer (WPT) is an emerging technology that can realize electric power transmission over certain distances without physical contact, offering significant benefits to modern automation systems, medical applications, consumer electronics, etc. This paper provides a comprehensive review of existing compensation topologies for the loosely coupled transformer. Compensation topologies are reviewed and evaluated based on their basic and advanced functions. Individual passive resonant networks used to achieve constant (load-independent) voltage or current output are analyzed and summarized. Popular WPT compensation topologies are given as application examples, which can be regarded as the combination of multiple blocks of resonant networks. Analyses of the input zero phase angle and soft switching are conducted as well. This paper also discusses the compensation requirements for achieving the maximum efficiency according to different WPT application areas.
14 June 2016 in IEEE Transactions on Industrial Electronics
Journal Article
Wireless power transfer system (WPTS)-based wireless electric vehicles, classified into roadway-powered electric vehicles (RPEVs) and stationary charging electric vehicles (SCEVs), are in the spotlight as future mainstream transportations. RPEVs are free from serious battery problems such as large, heavy, and expensive battery packs and long charging time because they get power directly from the road while moving. The power transfer capacity, efficiency, lateral tolerance, electromagnetic field, air-gap, size, weight, and cost of the WPTSs have been improved by virtues of innovative semiconductor switches, better coil designs, roadway construction techniques, and higher operating frequency. Recent advances in WPTSs for RPEVs are summarized in this review paper. The fifth- and sixth-generation online electric vehicles, which reduce infrastructure cost for commercialization, and the interoperability between RPEVs and SCEVs are addressed in detail in this paper. Major milestones of the developments of other RPEVs are also summarized. The rest of this paper deals with a few important technical issues such as coil structures, power supply schemes, and segmentation switching techniques of a lumped inductive power transfer system for RPEVs.
1 October 2016 in Applied Energy
Journal Article
ZBZicheng Bi
Zicheng BiTKTianze Kan
Tianze Kan
Chris MiYZYiming Zhang
Yiming Zhang
ZZZhengming Zhao
Zhengming Zhao
GKGregory A. Keoleian
Gregory A. Keoleian
About Me
Chris Mi is a fellow of IEEE and SAE, a Distinguished Professor of
Electrical and Computer Engineering, and the Director of the Caili and
Daniel Chang 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
his B.S. and M.S. degrees from Northwestern Polytechnical University,
Xi’an, China, and his 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, and CTO of EV Safe Charge, Inc. from 2000 to 2022. He is a
recipient of the “Distinguished Teaching Award” and “Distinguished
Research Award” of the University of Michigan Dearborn. He received
three Best Paper Awards from IEEE Transactions on Power Electronics and
the Inaugural IEEE Power Electronics Emerging Technology Award. In 2022,
he received the Albert W. Johnson Research Lectureship and was named a
Distinguished Professor, the highest honor given to an SDSU faculty
member. Most recently, he received the 2023 IEEE PELS Vehicle and
Transportation Systems Achievement Award, the IEEE Transactions on
Industry Applications Best Paper Award, the SDSU Innovator of the Year
Award, and the SDSU Alumni Distinguished Faculty Award.