Magnetic materials and soft-switched topologies for high-current DC-DC converters

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dc.contributor.advisor Hayes, John G. en
dc.contributor.advisor Egan, Michael G. en Rylko, Marek S. 2014-05-13T14:02:56Z 2014-05-13T14:02:56Z 2011 2011
dc.identifier.citation Rylko, M. S. 2011. Magnetic materials and soft-switched topologies for high-current DC-DC converters. PhD Thesis, University College Cork. en
dc.description.abstract The thesis is focused on the magnetic materials comparison and selection for high-power non-isolated dc-dc converters for industrial applications or electric, hybrid and fuel cell vehicles. The application of high-frequency bi-directional soft-switched dc-dc converters is also investigated. The thesis initially outlines the motivation for an energy-efficient transportation system with minimum environmental impact and reduced dependence on exhaustible resources. This is followed by a general overview of the power system architectures for electric, hybrid and fuel cell vehicles. The vehicle power sources and general dc-dc converter topologies are discussed. The dc-dc converter components are discussed with emphasis on recent semiconductor advances. A novel bi-directional soft-switched dc-dc converter with an auxiliary cell is introduced in this thesis. The soft-switching cell allows for the MOSFET's intrinsic body diode to operate in a half-bridge without reduced efficiency. The converter's mode-by-mode operation is analysed and closed-form expressions are presented for the average current gain of the converter. The design issues are presented and circuit limitations are discussed. Magnetic materials for the main dc-dc converter inductor are compared and contrasted. Novel magnetic material comparisons are introduced, which include the material dc bias capability and thermal conductivity. An inductor design algorithm is developed and used to compare the various magnetic materials for the application. The area-product analysis is presented for the minimum inductor size and highlights the optimum magnetic materials. Finally, the high-flux magnetic materials are experimentally compared. The practical effects of frequency, dc-bias, and converters duty-cycle effect for arbitrary shapes of flux density, air gap effects on core and winding, the winding shielding effect, and thermal configuration are investigated. The thesis results have been documented at IEEE EPE conference in 2007 and 2008, IEEE APEC in 2009 and 2010, and IEEE VPPC in 2010. A 2011 journal has been approved by IEEE Transactions on Power Electronics. en
dc.description.sponsorship European Commission (Marie-Curie Fellowship programme) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2011, Marek S. Rylko. en
dc.rights.uri en
dc.subject Magnetic materials comparison en
dc.subject Vehicle power sources en
dc.subject.lcsh Electric current converters en
dc.title Magnetic materials and soft-switched topologies for high-current DC-DC converters en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PHD (Engineering) en
dc.internal.availability Full text available en No embargo required en
dc.description.version Accepted Version
dc.contributor.funder General Motors Corporation, United States en
dc.contributor.funder European Commission en
dc.description.status Not peer reviewed en Electrical and Electronic Engineering en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
dc.internal.conferring Summer Conferring 2014

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© 2011, Marek S. Rylko. Except where otherwise noted, this item's license is described as © 2011, Marek S. Rylko.
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