Novel soft switching DC-DC converter with full ZVS-range and reduced filter requirement - Part I: Regulated-output applications

Raja Ayyanar, Ned Mohan

Research output: Contribution to journalArticle

149 Scopus citations

Abstract

A novel soft-switching topology for dc-dc converters is proposed. It is well suited for applications in the range of a few hundred watts to a few kilowatts. It is essentially a hybrid combination of an uncontrolled half-bridge section and a phase-shift controlled full-bridge section, realized with just four switches. The main features of the proposed topology are zero-voltage-switching down to no-load without serious conduction loss penalty, constant frequency operation and near-ideal filter waveforms. The improved filter waveforms result in significant savings in the input and output filter requirement, resulting in high power-density. The new topology requires two transformers and two dc-bypass capacitors. The combined VA rating of the two transformers is more than that of the single transformer of conventional full-bridge converters, for variable-input applications. In Part I of the paper, the converter operation is analyzed for typical switch-mode power supply applications, where the input voltage varies widely but the output voltage is fixed and is well regulated. Experimental results obtained from a 100-W/200-kHz proof-of-concept prototype confirm the superior features of the proposed hybrid configuration.

Original languageEnglish (US)
Pages (from-to)184-192
Number of pages9
JournalIEEE Transactions on Power Electronics
Volume16
Issue number2
DOIs
StatePublished - Mar 1 2001

Keywords

  • DC-DC converters
  • Hybrid converters
  • Phase-shifted full-bridge
  • Zero-voltage-switching

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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