A flying capacitor multilevel dual-active bridge converter for interfacing high voltage in more-electric aircraft
Freeman, Andrew J.
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https://hdl.handle.net/2142/132604
Description
Title
A flying capacitor multilevel dual-active bridge converter for interfacing high voltage in more-electric aircraft
Author(s)
Freeman, Andrew J.
Issue Date
2025-12-12
Director of Research (if dissertation) or Advisor (if thesis)
Stillwell, Andrew R
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
more-electric aircraft
power conversion
power electronics
flying capacitor multilevel
FCML
dual-active bridge
DAB
Abstract
More-electric aircraft (MEA) replace traditional mechanical and hydraulic subsystems with electrically powered equivalents, improving system-level power density, reliability, and maintainability. As MEA architectures approach the megawatt scale, both power generation and distribution voltage levels must increase, placing new demands on the power converters interfacing high-voltage buses with low-voltage buses and storage. While the dual-active bridge (DAB) converter has traditionally served this role, its reliance on single high-voltage devices constrains achievable switching frequency, resulting in bulky magnetics. The addition of a flying-capacitor multilevel (FCML) converter provides a high-frequency alternative that enables use of medium-voltage GaN technology, reduced magnetics volume, and improved theoretical efficiency across its operating range. The 6-level FCML-DAB converter is explored in this work, with a 700:28 V prototype achieving a peak efficiency of 93.75%.
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