NDLI: Near time-optimal transient response in DC-DC buck converters taking into account the inductor current limit

Content Provider	IEEE Xplore Digital Library
Author	Babazadeh, A. Corradini, L. Maksimovic, D.
Copyright Year	2009
Description	Author affiliation: Colorado Power Electronics Center, ECEE Department, 425 UCB, University of Colorado, Boulder, 80309, USA (Babazadeh, A.; Corradini, L.; Maksimovic, D.)
Abstract	This paper analyzes the general problem of inductor current limitation in the time-optimal load transient response of a DC-DC buck converter. The concept of current-limited, time-optimal control (CL-TOC) is introduced and compared to the previously reported unconstrained time-optimal solutions. A fundamental tradeoff between maximum allowed current overshoot and voltage recovery time is recognized, and a set of design equations is developed which provide the engineer with the necessary analytical tools for the controller design. Furthermore, the minimum number of switching actions required to handle a generic current-limited TOC is determined, leading to the formulation of a minimum-switch CL-TOC concept. Two distinct approaches for minimum-switch digital CL-TOC are then introduced. The first method, which is an extension of a charge-balance approach, has the advantage of achieving the time-optimal switching sequence without the need for a prior knowledge of the output filter LC parameters. The second approach implements a near CL-TOC employing the switching surface concept and defining the current limitation in the state-space. Simulation and experimental results are provided to demonstrate the effectiveness of the approaches.
Starting Page	3328
Ending Page	3335
File Size	467945
Page Count	8
File Format	PDF
ISBN	9781424428939
DOI	10.1109/ECCE.2009.5316312
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switching surface control Transient response Buck converters Inductor current limit Capacitors Power electronics Inductors Voltage control Equations Digital control Filters Optimal control Charge balance principle Time optimal control
Content Type	Text
Resource Type	Article

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