Multisampled Digital Average Current Controls of the Versatile Buck-Boost Converter

Carlos Restrepo, Tine Konjedic, Freddy Flores-Bahamonde, Enric Vidal-Idiarte, Javier Calvente, Roberto Giral

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The coupled-inductor buck-boost converter is a versatile dc-dc converter, which is suitable for performing different roles within the hybrid power systems. Its multiple advantageous features include noninverting voltage step-up/step-down characteristic, high efficiency, wide bandwidth control, ability to control the input and output voltages and currents, and so on. All the existing current control approaches for this type of converter are based on analog control implementation, which allows achieving high closed-loop bandwidth. However, analog control limits the possibilities for applying the advanced control schemes and algorithms for achieving smooth operating mode transitions. This paper proposes two digital current control strategies for a versatile buck-boost converter: a predictive average current control and a multisampled average current control. Both the proposed digital control strategies ensure fast tracking of the control set point, low steady-state error, and a practically undegraded dynamic response of the system in comparison with the analog average current control. The theoretical analyses have been validated by means of simulations and experimental tests performed on a 48-V 600-W purpose-built prototype.

Original languageEnglish
Article number8584492
Pages (from-to)879-890
Number of pages12
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume7
Issue number2
DOIs
Publication statusPublished - Jun 2019
Externally publishedYes

Keywords

  • Dead-zone avoidance
  • digital control
  • multisampled average current control (MACC)
  • noninverting buck-boost converter
  • predictive digital current programed control
  • wide bandwidth

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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