An improved stray capacitance model for inductors

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

    Research output: Contribution to journalArticlepeer-review

    64 Scopus citations

    Abstract

    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 languageBritish English
    Article number8672508
    Pages (from-to)11153-11170
    Number of pages18
    JournalIEEE Transactions on Power Electronics
    Volume34
    Issue number11
    DOIs
    StatePublished - Nov 2019

    Keywords

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

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