Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14602
Title: Adaptive high-bandwidth digitally controlled buck converter with improved line and load transient response
Authors: Lee, ATL
Sin, JKO
Chan, PCH 
Issue Date: 2014
Publisher: Institution of Engineering and Technology
Source: IET power electronics, 2014, v. 7, no. 3, p. 515-526 How to cite?
Journal: IET power electronics 
Abstract: Digitally controlled switching converter suffers from bandwidth limitation because of the additional phase delay in the digital feedback control loop. To overcome the bandwidth limitation without using a high sampling rate, this study presents an adaptive third-order digital controller for regulating a voltage-mode buck converter with a modest 2× oversampling ratio. The phase lag because of the analogue-to-digital converter (ADC) conversion time delay is virtually compensated by providing an early estimation of the error voltage for the next sampling time instant, enabling a higher unity-gain bandwidth without compromising stability. An additional pair of low-frequency pole and zero in the third-order controller increases the lowfrequency gain, resulting in faster settling time and smaller output voltage deviation during line transient. Both simulation and experimental results demonstrate that the proposed adaptive third-order controller reduces the settling time by 50% in response to a 1 V line transient and 30% in response to a 600 mA load transient, compared to the baseline static second-order controller. The fastest settling time is measured to be about 11.70 μs, surpassing the transient performance of conventional digital controllers and approaching that of the state-of-the-art analogue-based controllers.
URI: http://hdl.handle.net/10397/14602
ISSN: 1755-4535
EISSN: 1755-4543
DOI: 10.1049/iet-pel.2013.0263
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