Title page for ETD etd-12032010-174203


Type of Document Master's Thesis
Author Vulovic, Marko
Author's Email Address mvulovic@vt.edu
URN etd-12032010-174203
Title Digital Control of a High Frequency Parallel Resonant DC-DC Converter
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Boroyevich, Dushan Committee Chair
Lee, Fred C. Committee Member
Mattavelli, Paolo Committee Member
Keywords
  • inductorless output filter
  • DC-DC switching converter
  • non resonant coupled
  • gain scheduling
  • parallel resonant converter
  • high frequency digital control
Date of Defense 2010-11-05
Availability unrestricted
Abstract
A brief analysis of the nonresonant-coupled parallel resonant converter is performed. The converter is modeled and a reference classical analog controller is designed and simulated. Infrastructure required for digital control of the converter (including anti-aliasing filters and a modulator) is designed and a classical digital controller is designed and simulated, yielding a ~30% degradation in control bandwidth at the worst-case operating point as compared with the analog controller. Based on the strong relationship observed between low-frequency converter gain and operating point, a gain-scheduled digital controller is proposed, designed, and simulated, showing 4:1 improved worst-case control bandwidth as compared with the analog controller. A complete prototype is designed and built which experimentally validates the results of the gain-scheduled controller simulation with good correlation. The three approaches that were investigated are compared and conclusions are drawn. Suggestions for further research are presented.
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