Analysis of soft charging switched capacitor power converters

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.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Electrical & Computer Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• May, Ryan

Contributors dc:contributor

• Pilawa-Podgurski, Robert C.

• Hybrid Converter
• 2 Stage Converter
• Soft Charging
• Dickson
• Switch Capacitor

Statement dc:rights

• Copyright 2013 Ryan May

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/46665

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/46665