Title page for ETD etd-06062008-171908
|Type of Document
||Lotfi, Ashraf Wagih
||The electrodynamics of high frequency magnetics in power electronics
|Lee, Fred C.
|Besieris, Ioannis M.
|Chen, Dan Y.
|Kohler, Weiner E.
|Date of Defense
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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