Auxiliary Parallel Inductor Based Sequence Switching Control to Improve Load Transient Response of Buck Converters

Weiguo Lu, Weiming Chen, Yixiao Ruan, Herbert Iu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this paper, a sequence switching control (SSC) scheme based on auxiliary parallel inductor is proposed to improve the transient performance of buck converters. The proposed SSC scheme introduces a small controlled inductor in parallel with the output inductor, so as to increase the inductor-current slew rate when it is activated during a load transient. Furthermore, an "n+1" sequence switching strategy is proposed to control the auxiliary parallel inductor. The proposed scheme divides the transient event into n+1 periods. In the former n periods the same small output voltage deviations are designed, while in the last period a smaller deviation is done for a smooth transition from the transient to the steady state. The switching sequence is derived applying the capacitor-charge balance principle for each of n+1 periods. For a given buck converter in experiment, the settling time and the output voltage deviation of the proposed SSC scheme enhance more than 50% and 67% respectively over those of the time-optimal control (TOC) for a 3A load step.

Original languageEnglish
Article number8384283
Pages (from-to)2776-2784
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number4
DOIs
Publication statusPublished - Apr 2019

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