A New Transformer Model with Separate Common-Mode and Differential-Mode Capacitance

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Abstract

A new transformer equivalent circuit model is presented containing separate common-mode and differential-mode capacitors, allowing for direct and simple analysis of the transformers influence. The representation of common-mode and differential-mode signals in two-winding transformers have been described and presented. Problems related to two commonly used transformer equivalent circuit models are shown. Operation scenarios of an isolated full bridge phase-shift DC/DC converter is used to compare the new transformer model with a commonly used model. Three transformers with different turns-ratio are constructed, with the purpose of evaluating the transformer models. Both models provided accurate impedance prediction for transformers with turns-ratio equal to one. However, for turns-ratios different from one, the commonly used model has an error of 40%-132% in the predicted equivalent capacitance of the measurements, whereas the proposed model only has an error of 0.6%-7.3%. The proposed model is therefore the only model that predicts accurate transformer behavior for any turns-ratio.

Original languageEnglish
Title of host publicationProceedings - IECON 2020 : 46th Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE
Publication date18. Oct 2020
Pages1198-1204
Article number9255142
ISBN (Electronic)9781728154145
DOIs
Publication statusPublished - 18. Oct 2020
Event46th Annual Conference of the IEEE Industrial Electronics Society, IECON 2020 - Virtual, Singapore, Singapore
Duration: 19. Oct 202021. Oct 2020

Conference

Conference46th Annual Conference of the IEEE Industrial Electronics Society, IECON 2020
Country/TerritorySingapore
CityVirtual, Singapore
Period19/10/202021/10/2020
SponsorIEEE Industrial Electronics Society, SPECS - Smart Grid + Power Electronics Consortium Singapore, The Institute of Electrical and Electronics Engineers (IEEE)
SeriesIECON Proceedings (Industrial Electronics Conference)
Volume2020-October
SeriesProceedings of the Annual Conference of the IEEE Industrial Electronics Society
ISSN1553-572X

Keywords

  • Common mode
  • DC-DC power converters
  • Differential mode
  • Equivalent circuits
  • Impedance measurement
  • Modeling
  • Parasitic capacitance
  • Phase shifted converter
  • Transformers

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