Description
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%.
Details
Title
- A fast settling oversampled digital sliding-mode controller for DC-DC buck converters
Contributors
- Dashtestani, Ahmad (Author)
- Bakkaloglu, Bertan (Thesis advisor)
- Thornton, Trevor (Committee member)
- Song, Hongjiang (Committee member)
- Kiaei, Sayfe (Committee member)
- Arizona State University (Publisher)
Date Created
The date the item was original created (prior to any relationship with the ASU Digital Repositories.)
2013
Subjects
Resource Type
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Note
- thesisPartial requirement for: Ph.D., Arizona State University, 2013
- bibliographyIncludes bibliographical references (p. 61-63)
- Field of study: Electrical engineering
Citation and reuse
Statement of Responsibility
by Ahmad Dashtestani