Reduction of EMI in AC drives through dithering within limited switching frequency range

Abbas A. Fardoun, Esam H. Ismail

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

In this paper, a method is presented to reduce electromagnetic (EM) emissions in ac drives. This method is applicable to many ac drives. It is proposed to dither the switching frequency of the power devices of an inverter in a pseudorandom way to spread out the emitted RF energy over a larger frequency range. The proposed method requires only software changes. Practical constraints to implement the frequency dithering approach are discussed. Simulation and measurement results show an improvement of more than 10 dB. The proposed method also converts specific spikes in the long-wave range from narrowband to broadband noise, which results in less stringent EM emission requirements for many applications.

Original languageEnglish
Pages (from-to)804-811
Number of pages8
JournalIEEE Transactions on Power Electronics
Volume24
Issue number3
DOIs
Publication statusPublished - 2009

Keywords

  • AC drives
  • Electromagnetic interference (EMI)
  • Inverter
  • RF noise

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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