05. - 07.06.2018
PCIM Europe 2018
Power Electronics | Intelligent Motion | Renewable Energy | Energy Management


Tutorial 9

Magnetic Components - The Key to Future Power Electronic Circuits


Monday, 04.06.2018, 09:00 - 17:00 hrs


Arvena Park Hotel Nuremberg, Görlitzer Str. 51, 90473 Nuremberg


09:00 Magnetic Components - The Key to Future Power Electronic Circuits
Prof. William G. Hurley, National University of Ireland, Galway, Irland
Dr. Werner Hugo Wölfle, Traco Power Solutions, Wexford, Irland
Developments in power semiconductor devices naturally lead to higher frequency operation in the host circuit and this in turn means smaller magnetic components. The advent of GaN and SiC devices has accelerated the movement to resonant circuits for power conversion. High frequency operation of magnetic components means that additional losses occur: skin effect, proximity effect in windings and fringing effect around air-gaps. This tutorial will address all of these effects offering both analysis and practical solutions to mitigate any losses that arise.Losses for both sinusoidal and non-sinusoidal operation will be covered

This seminar is based on a textbook authored by the speakers: TRANSFORMERS AND INDUCTORS FOR POWER ELECTRONICS: Theory, Design and Applications, Wiley, 2013.

Outline of the Tutorial:

The Introduction covers the fundamental concepts of magnetic components that serve to underpin the later sections.

-Inductor Design
In Section I, the design rules for inductor design are established and examples of different types of inductors are given. The single coil inductor, be it in air or with a ferromagnetic core or substrate, is the energy storage device for magnetic fields. A special example is the inductor in a flyback converter, since it has more than one coil. Examples include: forward, flyback, pushpull and LLC resonant converters; filter chokes. Examples with both distributed and discrete gaps will be presented.

-Transformer Design
Section II deals with the general design methodology for transformers. Particular emphasis is placed on modern circuits where non-sinusoidal waveforms are encountered and power factor calculations for non-sinusoidal waveforms are covered. Optimised design for core and winding losses will be fully covered taking into account the additional losses at high frequency. Examples include: forward, pushpull and resonant converters.

-High Frequency Design
There is an inverse relationship between the size of a transformer and its frequency of operation. However, losses increase at high frequency. There is skin effect loss and proximity effect loss in the windings due to the non-uniform distribution of the current in the conductors. The core loss increases due to the eddy currents circulating in the magnetic core and due to hysteresis. General rules are established for optimising the design of windings under various excitation and operating conditions. A new robust and simplified approach to high frequency losses will be presented to optimise the winding design. Losses that result from fringing effect of the magnetic field around an air-gap will be covered. The use of litz wire for mitigating skin and proximity effects will be treated. The application of interleaving to reduce proximity effects will be explained.

Who should attend?
This seminar is of interest to and practising engineers working with power supplies and energy conversion systems; students of electrical engineering and electrical energy systems; graduate students dealing with specialised inductor and transformer design for high frequency operation.


Speaker detail

Professor William G. Hurley
Prof. William G. Hurley
National University of Ireland, Galway, Irland
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 and Ontario Hydro in Canada from 1977 to 1983. He has been at the National University of Ireland, Galway since 1991. He is a Life Fellow of the IEEE. He received the IEEE Power Electronics Society Middlebrook Technical Achievement Award in 2013 and was appointed Distinguished Lecturer of the IEEE for 2014-2017. He has co-authored a text book on magnetic component design for power electronics.
Mr. Werner Hugo Wölfle
Dr. Werner Hugo Wölfle
Traco Power Solutions, Wexford, Irland
Werner Hugo Wölfle was born in Bad Schussenried, Germany. He graduated from the University of Stuttgart in Germany in 1981 as a Diplom-Ingenieur in Power Electronics. He completed a PhD degree at the National University of Ireland, Galway in 2003. He worked for various companies in the field of Power Electronics as a Development Engineer for power converters in space craft, military and high grade industrial applications. Since 1989 he is Managing Director and head of the R&D Department of Traco Power Solutions in Ireland. Traco Power Solutions develops high reliability power converters and power supplies for industrial applications. Dr. Wölfle has co-authored a text book on magnetics for power electronics.