Analysis and design of a novel, single-stage, three-phase AC/DC step-down converter with electrical isolation

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15 Citations (Scopus)

Abstract

A novel, single-stage, three-phase AC/DC step-down converter with electrical isolation has been presented. The front semi-stage, which is a three-phase AC/DC buck-boost converter, is operated in discontinuous conduction mode (DCM) to achieve unity power factor, pure sinusoidal input current and low total harmonic distortion of input current. The rear semi-stage, which is a DC/DC forward converter, is operated in continuous conduction mode at heavy load and is operated in DCM at light load for step-down voltage conversion. Also, the proposed converter has low voltage stress across the DC-link capacitor. In addition, the sixth times line frequency ripple component of DC-link voltage can be eliminated. Thus, smaller DC-link capacitor is required. Furthermore, the steady-state analysis of voltage gain and boundary-operating condition are discussed. The selections of inductors and capacitors are presented. Finally, simulated and experimental results are supplied to verify the theoretical analysis.

Original languageEnglish
Pages (from-to)154-163
Number of pages10
JournalIET Power Electronics
Volume1
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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