Current Distribution on Parallel Conductors for Planar Transformers at High Frequency

Mingxiao Li, Ziwei Ouyang*, Michael A.E. Andersen, Wenbo Wang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

In high frequency and high current applications, use of parallel winding connection is becoming common practice in planar transformers. However, the current distribution on each parallel conductor is hard to predict. This paper investigates the effect of the insulation thickness and frequency on the current distribution of parallel conductors. When the copper thickness is much larger than the skin depth, the current on each parallel conductor becomes constant. Different layers have varying insulation thicknesses, which is often observed when printed circuit boards (PCB) are fabricated. This also result in unbalanced currents. Based on a 1D model, this paper proposes a methodology for determining the parallel current distribution, specifically used to the N:1 transformer when the copper thickness is much larger than the skin depth. No complex calculation algorithm or simulation software is required. Both finite element analysis (FEA) and theoretical model support the effectiveness of the proposed methodology, which can be used for many parallel structures. The experiment further verifies the theoretical analyses: the current on each parallel conductor is always constant at high frequency; the insulation thickness affects the current distribution.
Original languageEnglish
Title of host publicationProceedings of 2021 IEEE 12th Energy Conversion Congress and Exposition – Asia
PublisherIEEE
Publication date2021
Pages663-669
ISBN (Print)978-1-7281-6345-1
DOIs
Publication statusPublished - 2021
Event2021 IEEE 12th Energy Conversion Congress and Exposition – Asia - Singapore, Singapore
Duration: 24 May 202127 May 2021

Conference

Conference2021 IEEE 12th Energy Conversion Congress and Exposition – Asia
Country/TerritorySingapore
CitySingapore
Period24/05/202127/05/2021
SeriesProceedings of the Energy Conversion Congress and Exposition - Asia, Ecce Asia 2021
ISSN2150-6078

Keywords

  • High frequency
  • Parallel current distribution
  • Planar transformers

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