Title page for ETD etd-06062008-171908


Type of Document Dissertation
Author Lotfi, Ashraf Wagih
URN etd-06062008-171908
Title The electrodynamics of high frequency magnetics in power electronics
Degree PhD
Department Electrical Engineering
Advisory Committee
Advisor Name Title
Lee, Fred C. Committee Chair
Besieris, Ioannis M. Committee Member
Borojevich, Dushan Committee Member
Chen, Dan Y. Committee Member
Kohler, Weiner E. Committee Member
Keywords
  • Electrodynamics
Date of Defense 1993-05-05
Availability restricted
Abstract

The electromagnetic behavior of magnetic devices used in power electronics circuitry, is studied in order to predict their performance within a context of desirable circuit parameters. Past efforts have focused on simplifications widely used in electric machinery applications. Due to the greatly increased operating frequencies of today's circuits (in the upper kHz and lower MHz region), the operation and design of magnetic components greatly differs from those of 60 Hz machinery. A set of models based on assumptions that are unique to the these devices used in power electronics are put forth. The entire approach is based on deriving models from solutions of the field equations, rather than using older, less accurate circuit analogies. More importantly, models are needed for accurate design and optimization processes of complete power electronic systems, in which the magnetic components form a small part. Solutions are sought without using the popular simplifications at very low and very high frequencies, since they are not accurate at intermediate frequencies encountered in power electronics. The conductors used in transformers and inductors are modelled in these high frequency regions.

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