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Advances in Wireless Power Transfer Technology
Prof. Udaya K Madawala
The University of Auckland, New Zealand
Dr. Yeran Liu,
The University of Auckland, New Zealand
Wireless power transfer (WPT) systems, based on inductive power transfer (IPT) technology, that enable electrical power transfer from a supply to a load without the need for physical contacts are now used in many applications. Such WPT applications range from transcutaneous power transfer in mW for the supply of energy to implanted medical devices to ship to shore power transfer in MW for electric ferry battery charging. This tutorial covers the advances in IPT based WPT technology, and it is expected to be appealing to those who have interests in WPT technology as well as those who are already working in this area. Theory, modelling and control concepts of both uni- and bi-directional WPT systems are presented using design examples and analyses as appropriate. The tutorial focuses particularly on the bi-directional wireless power transfer (BD-WPT) technology that is developed for V2X applications, and presents its advances in relation to both stationary and dynamic wireless EV charging. The solutions that are proposed to mitigate the problems associated with grid-interfacing, pad-misalignment, efficiency, synchronization, power quality and optimal control are discussed with design examples. The modelling and control approach of each concept is demonstrated through real-time simulations.
High Power Density Electric Machine Drive Designs with Wide Bandgap Devices
Prof. Jin Wang
The Ohio State University, United States
Dr. Yousef Abdullah,
Kuwait University, Kuwait
The demands being place upon high performance high power density electric machine drive systems continues to grow as multiple industry sectors look to cut costs and improve power density and efficiency. For this reason, researchers and engineers have been working on wide bandgap (WBG) based power electronics circuits to meet the immediate needs of industry and satisfy future requirements.
The following tutorial provides an in-depth look of challenges and status or WBG motor drives, covering topics on both circuit level and system level, which include gate drive design, circuit layout, reflective wave, thermal design, EMI, leakage current, and insulation stress to motor windings with high dv/dt PWM. Two case studies, one on a 1.8 kVA integrated GaN based motor drive and the other on 7 kV 1 MVA SiC based motor drive, will be used as examples during the discussion.
The tutorial caters to professionals at the intermediate level. Audience members should be aware of basic power electronics devices and circuits and be interested in more recent developments. The following is the outline of the tutorial.
Power Semiconductor Filtering Technology
Prof. Henry Shu-hung Chung
City University of Hong Kong, Hong Kong
Dr. Chung-Pui Tung,
City University of Hong Kong, Hong Kong

Power electronics has become so pervasive and embedded in our daily lives. By 2030, more than 80% of electrical energy will be processed by some forms of power electronic systems. Main aims of power electronic systems are to control, convert, and condition electrical power flow from one form to another through the use of solid-state electronics. Regardless of application, a power electronic system or subsystem comprises three key sections: input filter, high-frequency switching network, and output filter. The switching network is the main power processing unit that manipulates power from the input to the output with low power dissipations in the switching devices. The input filter is used to prevent unwanted noise generated by the switching network from getting into the source, and assure compliance with regulatory electromagnetic compatibility standards, while the output filter is used to pass wanted electrical output form and attenuate unwanted noise to the load. Both filters are made up of passive components.

As practical switching devices and passive components are non-ideal, major amount of power losses in the system is in the conduction and switching losses of the switching network, and the ohmic and magnetic core losses of the filters. Although recent advances in new and emerging materials, device technologies, and network topologies have resulted in reducing the losses of switching devices and increasing the operating frequency for reducing the filter size, the filter sections still occupy considerable space and constitute a major part of the total power loss.

The ever-increasing density of power electronic systems is straining designers’ abilities to squeeze space for the filters without sacrificing performance. However, there have been no significant enhancements in the filter structure and design in today’s power electronic systems, as compared to the conventional approach. The filter section will become a key limiting factor in advancing the power density and performance of the future power electronic systems. The speaker will share a filtering technology, named “Power Semiconductor Filter (PSF)”, as a substitute for passive input filters. Performances of different types of converters with the PSF will be presented.