Separation of common and differential mode conducted emission: Power combiner/splitters

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012


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A conducted emission measurement contains a common and a differential mode component. Accurate separation of these two components is critical, when designing the input filter of a switch mode power supply. Many techniques exists for performing such separation. Some authors suggested the use
of wideband transformers, while other prefer current probes. In this paper the use of commercial power splitters/combiners as noise separators are considered. The performance of the noise separators are analyzed and validated based on scattering parameters (S-parameters). Impedance and rejection ratios (common and differential mode) are shown. The results based on S-parameters are used to propose a complete noise separator design. This separator is verified through experimental measurements. Finally an example on how to use the separator, when measuring conducted noise is given.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Renewable Energies and Power Quality
Number of pages6
Publication date2012
ISBN (print)978-84-615-6648-8
StatePublished - 2012
EventThe International Conference on Renewable Energies and Power Quality (ICREPQ'12) - Santiago de Compostela , Spain


ConferenceThe International Conference on Renewable Energies and Power Quality (ICREPQ'12)
CitySantiago de Compostela


  • EMI, Conducted emission, Power combiners/ splitters, Differential and Common mode
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