Marian K. Kazimierczuk (Advisor), Ronald Riechers (Committee Member), Raymond Siferd (Committee Member)
Master of Science in Engineering (MSEgr)
The operation of dc-dc PWM converters requires magnetic components that operate at high frequencies and carry large currents. At such frequencies the skin and proximity effects cause a substantial increase in power losses and ac resistance. This thesis reviews existing one dimensional analytical work on the prediction of these losses and, beginning with an inductor, derives expressions for the electromagnetic fields and power losses within the winding as well as the ac resistance of the device. The results of the inductor analysis are then extended to examine these quantities in transformers of various winding configurations. It is shown that proximity effects are theoretically eliminated and losses significantly reduced if the windings are interleaved in transformers with many layers. Following this, the more general case of a device with a core of arbitrary permeability is examined. It is found that 1-D analysis is insufficient to treat the analogous transformer case. It is shown that the losses in both devices can be significantly mitigated by optimizing the layer thicknesses and that the power savings is significant. A theoretical inconsistency in Dowell's approach is identified as well as its effects on the analysis done herein.
Department or Program
Department of Electrical Engineering
Year Degree Awarded
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