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A Fast Settling Oversampled Digital Sliding-Mode Controller for DC-DC Buck Converters

abstract: Sliding-Mode Control (SMC) has several benefits over traditional Proportional-Integral-Differential (PID) control in terms of fast transient response, robustness to parameter and component variations, and low sensitivity to loop disturbances. An All-Digital Sliding-Mode (ADSM) controlled DC-DC converter, utilizing single-bit oversampled frequency domain digitizers is proposed. In the proposed approach, feedback and reference digitizing Analog-to-Digital Converters (ADC) are based on a single-bit, first order Sigma-Delta frequency to digital converter, running at 32MHz over-sampling rate. The ADSM regulator achieves 1% settling time in less than 5uSec for a load variation of 600mA. The sliding-mode controller utilizes a high-bandwidth hysteretic differentiator and an integrator to perform the sliding control law in digital domain. The proposed approach overcomes the steady state error (or DC offset), and limits the switching frequency range, which are the two common problems associated with sliding-mode controllers. The IC is designed and fabricated on a 0.35um CMOS process occupying an active area of 2.72mm-squared. Measured peak efficiency is 83%. / Dissertation/Thesis / Ph.D. Electrical Engineering 2013

Identiferoai:union.ndltd.org:asu.edu/item:20800
Date January 2013
ContributorsDashtestani, Ahmad (Author), Bakkaloglu, Bertan (Advisor), Thornton, Trevor (Committee member), Song, Hongjiang (Committee member), Kiaei, Sayfe (Committee member), Arizona State University (Publisher)
Source SetsArizona State University
LanguageEnglish
Detected LanguageEnglish
TypeDoctoral Dissertation
Format75 pages
Rightshttp://rightsstatements.org/vocab/InC/1.0/, All Rights Reserved

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