Implementation of a transformerless common-mode active filter for offline converter systems

Marcelo Lobo Heldwein, Hans Ertl, Juergen Biela, Johann W. Kolar

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

This paper presents a study and practical implementation of an active filter employing a high-frequency (HF) power amplifier and passive-filter components to be connected to the ac power lines in order to mitigate common-mode conducted emissions of three-phase pulsewidth modulation converter systems. The filter topology is chosen from different possibilities listed in a literature survey and studied regarding practical implementation issues, where requirements for an HF power amplifier to be applied in active filtering are derived. Special attention is put on the stability analysis where the challenges for the feedback are discussed, and a simple feedback structure is proposed. Other feedback concepts are analyzed, and limitations posed by stability requirements are presented. A prototype is designed and built, from which mathematical and experimental results are obtained demonstrating the potential and limitations of such a system.

Original languageEnglish
Article number5256320
Pages (from-to)1772-1786
Number of pages15
JournalIEEE Transactions on Industrial Electronics
Volume57
Issue number5
DOIs
StatePublished - May 2010
Externally publishedYes

Keywords

  • Active filter
  • Conducted emissions
  • Three-phase PWM converters
  • Three-phase filters

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