Hybrid buckboost feedforward and reduced average inductor current techniques in fast line transient and high-efficiency buckboost converter

Ping Ching Huang*, Wei Quan Wu, Hsin Hsin Ho, Ke-Horng Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

This paper presents a buckboost converter with high efficiency and small output ripple to extend the battery life of portable devices. Besides, the hybrid buckboost feedforward (HBBFF) technique is integrated in this converter to achieve fast line response. The new control topology minimizes the switching and conduction losses at the same time even when four switches are used. Therefore, over a wide input voltage range, the proposed buckboost converter with minimum switching loss like the buck or boost converter can reduce the conduction loss through the use of the reduced average inductor current (RAIC) technique. Moreover, the HBBFF technique minimizes the voltage variation at the output of error amplifier. Consequently, a fast line transient response can be achieved with small dropout voltage at the output. Especially, the converter can offer good line and load regulations to ensure a regulated output voltage without being affected by the decreasing battery voltage. Experimental results show that the output voltage is regulated over a wide battery lifetime, and the output ripple is minimized during mode transition. The peak efficiency is 97% and the transient dropout voltage can be improved substantially.

Original languageEnglish
Article number22
Pages (from-to)719-730
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume25
Issue number3
DOIs
StatePublished - 16 Apr 2010

Keywords

  • Fast line transient response
  • Feedforward technique
  • High efficiency
  • Noninverting buck–boost converter
  • Smooth transition

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