We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Adaptive high-bandwidth digitally controlled buck converter with improved line and load transient response.
- Authors
Lee, Albert T.L.; Sin, Johnny K.O.; Chan, Philip C.H.
- 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 2x 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 s, surpassing the transient performance of conventional digital controllers and approaching that of the state-of-the-art analogue-based controllers.
- Subjects
ADAPTIVE control systems; BANDWIDTHS; DIGITAL control systems; CASCADE converters; ERROR analysis in mathematics
- Publication
IET Power Electronics (Wiley-Blackwell), 2014, Vol 7, Issue 3, p515
- ISSN
1755-4535
- Publication type
Article
- DOI
10.1049/iet-pel.2013.0263