Wideband Small-Signal Model of Common-Mode Inductors Based on Stray Capacitance Estimation Method

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Abstract

<p>This study presents a wideband small-signal model for common-mode inductors (CMIs) based on the stray capacitance estimation method. The proposed model can be used to calculate the small-signal characteristics of CMIs over a wide band of frequencies by substituting the stray capacitance values in the model are considering the frequency dependence of the complex permeability. The common-mode (CM) impedances of the fabricated manganese zinc-ferrite and nanocrystalline CMIs are measured using an impedance analyzer to validate the proposed model. Comparisons between the results of the measured and calculated CM impedances for the fabricated CMIs show that the proposed model enables the calculation of the CM impedances of CMIs over a wide frequency range from 1kHz to 100MHz.</p>

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