Effects of Stray Inductance on Hard-Switched Switched Capacitor Converters

Abstract

Switched capacitor (SC) converters are becoming quite popular for use in DC-DC power conversion. The concept of equivalent resistance in SC converters is frequently used to determine the conduction losses due to the load current. A variety of methodologies have been presented to predict the equivalent resistance in hard-switched SC converters. These works, however, did not consider the effect of stray inductance on equivalent resistance. Current power converter design practices favor higher switching frequencies, moving hard-switched SC converters into operating areas in which stray inductance affects converter performance. This paper presents an analytic equation that can be used to evaluate the effects of stray inductance on the equivalent resistance of switched capacitor converters. The concepts proposed here are verified by both digital simulation and a prototype converter. The equations presented can be used to evaluate the effects of stray inductance on SC converter performance, thereby helping designers set a maximum operating frequency to limit its effect.

Meeting Name

IEEE Power and Energy Conference at Illinois (2014: Feb. 28-Mar. 1, Champaign, IL)

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

Power Converters; Analytic Equations; Converter Performance; DC-DC Power Conversion; Digital Simulation; Equivalent Resistance; Maximum Operating Frequency; Prototype Converter; Switched Capacitor Converter; Inductance; Resistance; Switches; Equations; Capacitors; Mathematical Model; Inductance; Power Electronics; Switched Mode Power Supplies; DC-DC Power Convertors

International Standard Book Number (ISBN)

978-1479948819

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Mar 2014

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