NDLI: Near-Null Response to Large-Signal Transients in an Augmented Buck Converter: A Geometric Approach

Content Provider	IEEE Xplore Digital Library
Author	Kapat, S. Shenoy, P.S. Krein, P.T.
Copyright Year	1986
Abstract	The maximum closed-loop bandwidth of a dc-dc converter is restricted to a fraction of its switching frequency when governed by a conventional average-based pulsewidth modulation (PWM) controller. Even an advanced geometric control is limited by internal slew rates. The bandwidth can reach or exceed the switching frequency through converter augmentation; however, this requires a nonlinear control algorithm and circuit arrangements. This paper considers methods of augmentation and control for a fast buck converter. Conditions for time-optimal transient recovery are obtained for both instantaneous and delayed transient disturbance detection. Design tradeoffs and control issues related to augmentation are considered here. The main switch is controlled using a fixed frequency PWM current-mode control with load current feedforward, and augmented switches are controlled using frequency-limited bang-bang control based on a geometric approach. A small-signal model is obtained and extended control bandwidth is demonstrated. Fast transient recovery is achieved for both single- and two-resistance augmentation. A prototype augmented buck converter is tested. Output voltage and inductor current overshoot and undershoot can be lowered more than with previous methods. It is possible to achieve near-null response in the sense of ripple band to a large-signal transient.
Sponsorship	IEEE Power Electronics Society
Starting Page	3319
Ending Page	3329
Page Count	11
File Size	1350356
File Format	PDF
ISSN	08858993
Volume Number	27
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transient analysis Inductors Delay Switches Capacitors Impedance ultrafast dynamic performance Augmented buck converter high bandwidth near-null response
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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