A Dynamic Model of Switched-Capacitor Power Converters

Abstract

Switched-capacitor (SC) converters are frequently used for low-power applications that require little or no output regulation. Previous work has established static SC converter models, essentially composed of an ideal transformer (with turns ratio determined by the topology) and an output resistance that varies with component choices, switching frequency, and duty ratio. In this paper, the static model is expanded to include the dynamic response to the input voltage and output current changes. The dynamic model is particularly important in systems that experience large output power transients, such as low-power systems that enter and exit sleep modes. For applications that are only concerned with input-output behavior, a reduced-order model that neglects internal dynamics is derived. The dynamic model is validated with both simulations and experimental results.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

DC-DC Power Converter; Input-Output Behavior; Low Power Application; Output Resistance; Reduced Order Models; Switched-Capacitor Circuits; Switched Capacitor Converter; Switched-Capacitor Power Converters; Capacitors; Dynamic Response; Electric Resistance; State Space Methods; Dynamic Models; DC-DC Power Converters

International Standard Serial Number (ISSN)

0885-8993; 1941-0107

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

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

Publication Date

01 Apr 2014

Link to Full Text

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