Analysis of soft charging switched capacitor power converters
May, Ryan
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https://hdl.handle.net/2142/46665
Description
Title
Analysis of soft charging switched capacitor power converters
Author(s)
May, Ryan
Issue Date
2014-01-16T17:58:12Z
Director of Research (if dissertation) or Advisor (if thesis)
Pilawa-Podgurski, Robert C.
Department of Study
Electrical & Computer Engineering
Discipline
Electrical & Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Soft Charging
Dickson
Switch Capacitor
Hybrid Converter
2 Stage Converter
Abstract
Switch capacitor converters are a microcosm in the world of power converters and as such have received little attention in both research and application. There is a perception that they possess many undesirable operating characteristics, such as inefficiency, poor output regulation and tracking, and large impulse currents. These perceptions relegate switch capacitor converters to very niche solutions or even preclude them from consideration.
The focus of this thesis is to outline soft-charging control, which addresses the stigmas associated with switch capacitor converters. A topology analysis is performed to determine which topologies can support soft-charging, and the Dickson charge pump is selected for the continued development of soft-charging control. The specifics of adapting soft-charging to the Dickson topology are accomplished through a loop-by-loop analysis to modify the phase structure and charge vector analysis to calculate the switching threshold control parameters. The result is a capacitive-magnetic, 2-stage hybrid converter that achieves greater capacitor utilization and effective output regulation. The interplay between the two stages allows each stage's operation to be augmented, while mitigating the drawbacks. This solution is well suited for large step-down applications that need high efficiency and power demonstrated with 8:1 and a 9:1 Dickson converter using soft-charging control.
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