NDLI: Characterization and performance comparison of ripple-based control for voltage regulator modules

Content Provider	IEEE Xplore Digital Library
Author	Jian Sun
Copyright Year	1986
Abstract	Three recently developed control methods for voltage regulator modules, namely, V/sup 2/ control, enhanced V/sup 2/ control, and enhanced V/sup 2/ control without output voltage dynamic feedback, are analyzed and compared in this paper. All three methods utilize the output voltage switching ripple for pulse-width modulation (PWM), hence, are collectively referred to as ripple-based control. A general modeling method based on the Krylov-Bogoliubov-Mitropolsky ripple estimation technique is applied to develop averaged models for single-channel as well as multichannel buck converters employing each of the control methods. Unlike existing models that are limited to small-signal operation, the proposed models are valid for large-signal operation and are capable of predicting subharmonic instability without including any sample-and-hold block as used in previous models. The paper also shows that adding parallel, high-quality ceramic capacitors at the output, which are ignored in previous models, can lead to pulse skipping and ripple instability, and a solution based on proper selection of the ceramic capacitors and/or ramp compensation at the PWM is presented. The models are further applied to analyze and compare the performance of the three control methods in terms of ripple stability, effective load current feedforward gain, and output impedance.
Sponsorship	IEEE Power Electronics Society
Starting Page	346
Ending Page	353
Page Count	8
File Size	762622
File Format	PDF
ISSN	08858993
Volume Number	21
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage control Regulators Pulse width modulation Predictive models Space vector pulse width modulation Ceramics Capacitors Output feedback Buck converters Performance analysis VRM control Averaged modeling enhanced load current feedforward ripple-based control ripple estimation ripple instability voltage regulator modules (VRMs)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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