A simple smooth transition technique for the noninverting buck-boost converter

Leonardo Callegaro, Mihai Ciobotaru, Daniel J. Pagano, Eugenio Turano, John E. Fletcher

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The noninverting buck-boost converter has attracted significant attention in the photovoltaic (PV) module integrated application, as it offers high efficiency while maintaining a low cost and a simple topology. When this converter is employed, special care must be taken at the transition between buck and boost operating modes, as a dead-zone in the voltage transfer function can cause abrupt perturbations in the controlled voltage, decreasing the regulation quality and ultimately lowering the power conversion efficiency. In this paper, a new dead-zone compensation technique is proposed with the scope of smoothing the transition between operating modes, eliminating the voltage ripple and improving the regulation performance, while maintaining high efficiency. The converter under analysis is studied together with its gate driving circuit, which is based on a bootstrap capacitor power supply for the high-side switches. The proposed dead-zone compensation technique is deduced by using the principle of maintaining the ideal voltage gain function across the converter operating range. The technique is analyzed, implemented and tested on a purposely built PV module integrated noninverting buck-boost converter. The experiments reveal a sensible improvement of the voltage regulation during mode transition, confirming the effectiveness of the proposed technique and its fitness for the PV application.
Original languageEnglish
Pages (from-to)4906-4915
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume33
Issue number6
DOIs
Publication statusPublished - Jun 2018
Externally publishedYes

Keywords

  • Buck-boost transitions
  • DC-DC power converters
  • noninverting buck-boost converter
  • nonlinearities
  • photovoltaic power systems

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