Analysis and optimization of switched-capacitor DC-DC converters

TitleAnalysis and optimization of switched-capacitor DC-DC converters
Publication TypeConference Paper
Year of Publication2006
AuthorsSeeman MD, Sanders SR
Conference NameProceedings of the IEEE Workshop on Computers in Power Electronics, COMPEL
AbstractAnalysis methods are developed that fully determine a switched-capacitor (SC) DC-DC converter's steady-state performance through evaluation of its output impedance. 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 the 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 boost converter for medium to high conversion ratios