A Comparative Study on Parasitic Capacitance in Inductors With Series or Parallel Windings

Hongbo Zhao, Zhixing Yan*, Shaokang Luan, Dipen Narendra Dalal, Jannick Kjar Jorgensen, Rui Wang, Xiang Zhou, Szymon Michal Beczkowski, Bjorn Rannestad, Stig Munk-Nielsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

9 Citations (Scopus)
90 Downloads (Pure)


In high-power medium-voltage applications, inductors usually have multiple windings on a single core, due to the high inductance value and high current stress. The multiple coils are electronically connected in either series or parallel, with considerations of windings loss and cost. However, the differences in parasitic capacitance of inductors using parallel and series connections are not discussed. Therefore, this article reveals that in comparison to parallel connections for windings, utilizing series connection for winding can significantly reduce the parasitic capacitance in multiwindings inductors without sacrificing the power density and adding manufacturing complexities. Physics-based models of parasitic capacitance in inductors with round-cable and copper-foil windings are developed for theoretical analysis. According to the theoretical analysis, the equivalent capacitance contributed by the stored electric field energy between two layers can be halved at least. The theoretical analysis is also verified by FEM simulations. Six prototyped inductors are experimentally compared to validate the theory.

Original languageEnglish
JournalIEEE Transactions on Power Electronics
Issue number12
Pages (from-to)15140-15151
Number of pages12
Publication statusPublished - 1 Dec 2022

Bibliographical note

Funding Information:
This work was supported in part by MVolt project is cofunded by the Department of Energy Technology of Aalborg University, Innovation Fund Denmark, Siemens Gamesa, Vestas Wind System, and KK wind solutions and in part by PH-Mag is an internal project funded by Aalborg University.

Publisher Copyright:
© 1986-2012 IEEE.


  • Inductors
  • multiple windings
  • parallel connections
  • parasitic capacitance
  • series connections


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