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Article: Adaptive High-Bandwidth Digitally Controlled Buck Converter with Improved Line and Load Transient Response

TitleAdaptive High-Bandwidth Digitally Controlled Buck Converter with Improved Line and Load Transient Response
Authors
Issue Date2014
PublisherThe Institution of Engineering and Technology. The Journal's web site is located at http://digital-library.theiet.org/IET-PEL
Citation
IET Power Electronics, 2014, v. 7 n. 3, p. 515-526 How to Cite?
AbstractDigitally controlled switching converter suffers from bandwidth limitation because of the additional phase delay in the digital feedback control loop. In order to overcome the bandwidth limitation without using a high sampling rate, this paper presents an adaptive third-order digital controller for regulating a voltage-mode buck converter with a modest 2x oversampling ratio. The phase lag due to the 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 low-frequency 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 around 11.70 s, surpassing the transient performance of conventional digital controllers and approaching that of the state-of-the-art analog-based controllers.
Persistent Identifierhttp://hdl.handle.net/10722/215298
ISSN
2014 Impact Factor: 1.683
2015 SCImago Journal Rankings: 1.083

 

DC FieldValueLanguage
dc.contributor.authorLee, ATL-
dc.contributor.authorSin, JKO-
dc.contributor.authorChan, PCH-
dc.date.accessioned2015-08-21T13:21:09Z-
dc.date.available2015-08-21T13:21:09Z-
dc.date.issued2014-
dc.identifier.citationIET Power Electronics, 2014, v. 7 n. 3, p. 515-526-
dc.identifier.issn1755-4535-
dc.identifier.urihttp://hdl.handle.net/10722/215298-
dc.description.abstractDigitally controlled switching converter suffers from bandwidth limitation because of the additional phase delay in the digital feedback control loop. In order to overcome the bandwidth limitation without using a high sampling rate, this paper presents an adaptive third-order digital controller for regulating a voltage-mode buck converter with a modest 2x oversampling ratio. The phase lag due to the 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 low-frequency 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 around 11.70 s, surpassing the transient performance of conventional digital controllers and approaching that of the state-of-the-art analog-based controllers.-
dc.languageeng-
dc.publisherThe Institution of Engineering and Technology. The Journal's web site is located at http://digital-library.theiet.org/IET-PEL-
dc.relation.ispartofIET Power Electronics-
dc.rightsThis paper is a postprint of a paper submitted to and accepted for publication in IET Power Electronics and is subject to IET copyright. The copy of record is available at IET Digital Library-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleAdaptive High-Bandwidth Digitally Controlled Buck Converter with Improved Line and Load Transient Response-
dc.typeArticle-
dc.identifier.emailLee, ATL: tlalee@hku.hk-
dc.description.naturepostprint-
dc.identifier.doi10.1049/iet-pel.2013.0263-
dc.identifier.hkuros244386-
dc.identifier.volume7-
dc.identifier.issue3-
dc.identifier.spage515-
dc.identifier.epage526-
dc.publisher.placeUnited Kingdom-

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