An Improved Stray Capacitance Model for Inductors

Zhan Shen*, Huai Wang, Yanfeng Shen, Zian Qin, Frede Blaabjerg

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

62 Citations (Scopus)


This paper proposes an improved analytical stray capacitance model for inductors. It considers the capacitances between the winding and the central limb, side limb, and yoke of the core. The latter two account for a significant proportion of the total capacitance with the increase of the core window utilization factor. The potential of the floating core/shield is derived analytically, which enables the model to apply not only for the grounded core/shield, but also for the floating core/shield cases. On the basis of the improved model, an analytical optimization method for the stray capacitance in inductors is proposed. Moreover, a global Pareto optimization is carried out to identify the tradeoffs between the stray capacitance and ac resistance in the winding design. Finally, the analysis and design are verified by finite element method simulations and experimental results on a 100-kHz dual active bridge converter.

Original languageEnglish
Article number8672508
Pages (from-to)11153-11170
Number of pages18
JournalIEEE Transactions on Power Electronics
Issue number11
Publication statusPublished - 2019


  • Core/shield-related capacitance
  • dual active bridge (DAB) converter
  • inductor
  • optimization
  • stray capacitance


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