Analysis and design of compact and efficient high step-up flying capacitor multilevel converters
Liao, Zitao
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https://hdl.handle.net/2142/97519
Description
Title
Analysis and design of compact and efficient high step-up flying capacitor multilevel converters
Author(s)
Liao, Zitao
Issue Date
2017-04-28
Director of Research (if dissertation) or Advisor (if thesis)
Pilawa-Podgurski, Robert C.N.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
DC-DC
High voltage
Gallium nitride (GaN)
Multilevel
Power electronics
Abstract
This thesis explores the possibilities to improve the power density (power to volume ratio) and the efficiency of DC-DC boost converters by using Flying Capacitor Multilevel (FCML) converter topology. DC-DC boost converters are widely used in electrical systems for stepping up the source DC voltage to higher levels. For many applications that are constrained by power consumption and physical space for installation, power converters with high efficiency and power density are preferred. A conventional DC-DC boost converter has many limitations with regard to achieving high power density and efficiency at high voltage gain, such as high switching loss, high voltage stress on main switches and large inductor volume. The FCML converter topology utilizes high energy density capacitors and inductors to store and transfer energy, which brings many inherent properties to overcome many limitations of conventional DC-DC boost converters. This thesis will present the analysis and design process for a FCML boost converter hardware prototype.
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