An Improved Stray Capacitance Model for Inductors

Journal article (2019)

Authors

Zhan Shen Aalborg University
Huai Wang Aalborg University
Yanfeng Shen University of Cambridge
Z. Qin DC systems, Energy conversion & Storage - EEMCS
Frede Blaabjerg Aalborg University
Research Group
DC systems, Energy conversion & Storage (EEMCS) (TU Delft)
Optimization Inductor Dual active bridge (DAB) converter Core/shield-related capacitance Stray capacitance
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Published Date

2019

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

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.

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