Equivalent Electrical Model of an Inductor Excited by a Triangular Current Including Saturation

Jorge Rafael Gonzalez-Teodoro,Enrique Romero-Cadaval,Vladimir Kindl,Rafael Asensi

doi:10.26552/com.c.2020.3.110-118

Jorge Rafael Gonzalez-Teodoro, Enrique Romero-Cadaval + Show 2 more

Open Access

https://doi.org/10.26552/com.c.2020.3.110-118

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Abstract

A model for an equivalent electrical circuit designed for a ferrite (3C90) inductor usually used in power converters excited by a non-sinusoidal current appropriate for use in power electronics is proposed. This study, based on 3D finite element analysis, leads to significant precision advantages over 2D analysis for non-symmetric inductors. The frequency range of the analysis for the toroidal core was between 15 kHz and 1 GHz, with different levels of excitation in non-saturation and saturation status focusing on the power loss.

Highlights

2 Procedure for parameter extractionFerrites (3C90) are common used due to their losses data and permeability characteristics [1,2,3,4,5,6] in power converters
An electrical-magnetic model of a ferrite inductor valid for triangular current excitations is presented for a 15 kHz to 1 GHz frequency range with different signals to include the saturation status in the analysis
The core for the inductor component analysed in this work was toroidal because they are common in transformers and inductive components, they do not have symmetry and they cannot be solved using Maxwell’s equations in either 1D or 2D finite element analysis (FEA)

Summary

Procedure for parameter extraction

Ferrites (3C90) are common used due to their losses data and permeability characteristics [1,2,3,4,5,6] in power converters These components have non-linear behaviour that needs to be added in electromagnetic analysis to develop a transient simulation of these power converters [7,8,9,10,11]. An electrical-magnetic model of a ferrite inductor valid for triangular current excitations is presented for a 15 kHz to 1 GHz frequency range (the range of switching frequencies used by power electronic converters based on Si, SiC or GaN semiconductors) with different signals to include the saturation status in the analysis. Model 1(b) is selected for non-saturation including the winding parameters in the equivalent circuit of the inductor component

Triangular signals

Hysteresis loss

Eddy current loss

Analysis using 3D FEM

Conclusions