Analysis and Optimization of Switched-Capacitor DC-DC Converters

Analysis methods are developed that fully determine a switched-capacitor (SC) dc-dc converter's steady-state performance through evaluation of its output impedance. This analysis method has been verified through simulation and experimentation. The simple formulation developed permits optimizati...

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Bibliographic Details
Published in:IEEE transactions on power electronics Vol. 23; no. 2; pp. 841 - 851
Main Authors: Seeman, M.D., Sanders, S.R.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.03.2008
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Analysis
Analytical models
Applied sciences
Capacitance
Capacitors
Capacitors. Resistors. Filters
Circuit properties
Circuits
Constraint optimization
dc-dc converter
DC-DC power converters
Dielectric, amorphous and glass solid devices
Electric currents
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Impedance
Methods
output impedance
Performance analysis
Power electronics, power supplies
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Steady-state
switched-capacitor
Switches
Switching converters
Various equipment and components
Magnetic circuit convertor
Performance evaluation
dc-dc converter
Direct current convertor
Optimization method
switched-capacitor
Power capacitor
Output impedance
Experimental study
DC-DC power convertors
Steady state
Switching
Optimization
Analysis method
Analysis
Capacitance
Electric loss
System simulation
Selector switch
Comparative study
Energy storage
ISSN:0885-8993, 1941-0107
Online Access:Get full text
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Description
Summary:Analysis methods are developed that fully determine a switched-capacitor (SC) dc-dc converter's steady-state performance through evaluation of its output impedance. This analysis method has been verified through simulation and experimentation. The simple formulation developed permits optimization of the capacitor sizes to meet a constraint such as a total capacitance or total energy storage limit, and also permits optimization of the switch sizes subject to constraints on total switch conductances or total switch volt-ampere (V-A) products. These optimizations then permit comparison among several switched-capacitor topologies, and comparisons of SC converters with conventional magnetic-based dc-dc converter circuits, in the context of various application settings. Significantly, the performance (based on conduction loss) of a ladder-type converter is found to be superior to that of a conventional magnetic-based converter for medium to high conversion ratios.
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ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2007.915182