Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/142811
Title: HIGH PERFORMANCE THREE PHASE AC/DC CONVERTERS FOR DATA CENTERS
Authors: ALI KAWSAR
ORCID iD:   orcid.org/0000-0002-2777-3957
Keywords: nine-switch converter, APWM, resonant converter, ac-dc converter, three-carrier modulation, dc-dc converter
Issue Date: 21-Dec-2017
Citation: ALI KAWSAR (2017-12-21). HIGH PERFORMANCE THREE PHASE AC/DC CONVERTERS FOR DATA CENTERS. ScholarBank@NUS Repository.
Abstract: This thesis has proposed novel AC-DC and DC-DC converters to improve the efficiency and power density of the power supplies of DC based data centers. For the three-phase AC-DC conversion, a SiC-based nine-switch single-stage converter is introduced. Apart from CCM operation, which is uncommon for a single-stage converter, the proposed converter features 25% saving in switch-count and 67% reduction of output voltage ripple than its twelve-switch equivalent. For the point-of-load DC-DC conversion, this thesis proposes a novel APWM half-bridge resonant converter with naturally extended ZVS range. The novelty of this converter is in its design, which uses the magnetizing current and eliminates the need of extra components that are otherwise used in APWM HB resonant converter for ensuring ZVS. Finally, while reviewing the nine-switch converter, this thesis also benchmarks, both analytically and experimentally, the application criteria of the nine-switch converter for having lower conduction loss than the twelve-switch back-to-back converter.
URI: http://scholarbank.nus.edu.sg/handle/10635/142811
Appears in Collections:Ph.D Theses (Open)

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