Friday morning, 28 June 2019
Advances in Planar Magnetics for High Frequency Switched Mode Power Supply
Today, high efficiency and high power density converters are fundamental to the continued profitable growth of the telecommunications, automotive, aerospace and data processing industries. High-frequency operation can lead to a reduction in magnetics size and an increase in power density. The momentum towards high efficiency, high frequency, and high power density in power supplies limits wide use of conventional wire-wound magnetic component structures.
Planar magnetics fabrication and assembly processes have several advantages over conventional magnetics:
• Low profile —planar magnetic components has a lower profile that their wire wound counterparts due to the fabrication process;
• Automation — based on advanced computer aided manufacturing techniques;
• High power densities — planar inductors and transformers are spread out and this gives them a bigger surface-to-volume ratio than conventional components, this enhances the thermal performance;
• Predictable parasitics —with planar magnetics, the windings are precise and consistent, yielding magnetic designs with highly controllable and predictable characteristic parameters.
Planar magnetic components take advantage of microelectronic processing. In general the number of turns in planar device tends to be limited by the manufacturing process. The low profile tends to lead to a larger footprint compared with its conventional counterpart. Planar magnetic components are particularly suited to wireless power transfer because of their low profile. In multilayer devices the interlayer capacitance introduces resonance at high frequencies. This seminar covers the basic analytical model of planar structures based on impedance method, and also includes several design considerations such as high frequency winding resistance, high frequency leakage inductance, winding capacitance and magnetic core loss etc.
Ziwei Ouyang (M’11, SM’17) received his PhD degree from Technical University of Denmark (DTU) in 2011. From 2011 to 2013, he was a postdoc researcher at DTU. From 2013 to 2016, he was appointed as an assistant professor at the same department. Since from April 2016, he is an associate professor at DTU. His research areas focus on high‐frequency planar magnetics modeling and integration, high‐density high-efficiency power converters, PV battery energy storage system, and wireless charging etc.
He is IEEE senior member. He has over 60 high impact IEEE journal and conference publications, co‐author on a book chapter on Magnetics for the “Handbook of Power Electronics” and currently he is the holder of 8 international patents. He was a recipient of Young Engineer Award at PCIM‐Asia 2014, and received Best Ph.D. Dissertation of the Year Award 2012 in Technical University of Denmark. He received several Best Paper Awards in IEEE sponsored international conferences. He has been invited to give lectures in many universities, enterprises and educational seminars and workshops around the world including USA, Europe and China. He is currently collabrating with the Europen Power Electronics Center (ECPE) as a tutorial chairman for the topic of “Passives in Power Electronics: Magnetic Component Design & Simulation”. He has served as session chair in many IEEE sponsored conferences and associated editor for IEEE Journal of Emerging and Selected Topics in Power Electronics. Currently, he is responsible for the Power Electronics course for both undergraduate and graduate students at DTU, and he also supervised more than 50 students’ projects including Postdoc, Ph.D. and Master projects.
William Gerard Hurley received the B.E. degree in Electrical Engineering from the National University of Ireland, Cork in 1974, the M.S. degree in Electrical Engineering from the Massachusetts Institute of Technology, Cambridge MA, in 1976 and the PhD degree at the National University of Ireland, Galway in 1988.
He worked for Honeywell Controls in Canada from 1977 to 1979. He worked for Ontario Hydro from 1979 to 1983. He is professor emeritus of Electrical Engineering at the National University of Ireland, Galway. He is a visiting professor at Tianjin University of Technology. He served on the faculty at the Massachusetts Institute of Technology as a Visiting Professor of Electrical Engineering in 1997/1998. Prof. Hurley has given invited presentations on magnetics in Canada, Mexico, Japan, Singapore, Spain, Czech Republic, Hong Kong, China, Australia and USA.
Research interests include high frequency magnetics, power quality, and renewable energy systems. Prof. Hurley is a Fellow of the IEEE. He was General Chair of the Power Electronics Specialists Conference in 2000. He is the 2013 recipient of the IEEE PELS Middlebrook Award for Technical Achievement. He was appointed Distinguished Lecturer of the IEEE for 2014/17. He received the Harry Owen Award for Distinguished Service to the IEEE Power Electronics Society in 2018. He has authored a textbook on magnetics and it was translated into Chinese.