Modeling the Characteristics of Ferrite Beads of EMI Filters Used to Ensure Electromagnetic Compatibility

The issues of modeling the characteristics of ferrite bead materials used both individually and in electromagnetic compatibility filters are considered. The article proposes two approaches for obtaining mathematical models of the characteristics of the material of ferrite beads. The first approach consists in the mathematical representation of the considered characteristics by approximating the experimental curves for the corresponding values of field intensity. The second approach is to approximate the characteristics of the ferrite bead material for the corresponding values of frequency and field intensity. The authors have proposed regressors for constructing approximating functions for different ferrite materials. The resulting models have demonstrated high accuracy of agreement with the experimental values. Assessment of the accuracy of the constructed models using the coefficient of determination showed that it is in the range of 0.84-0.91 for various ferrite materials.