Broadband Circuit Model of a Ferrite Core, Including Dimensional Resonance, Saturation, and Hysteresis

EMC Component Modeling and System-Level Simulations of Power Converters: AC Motor Drives

“…A description of the measurement setup used to characterize the magnetic properties and the parameter extraction procedure for the equivalent circuit has been provided. This model has been further extended in [16] to also account for dimensional resonance in ferrites. We use this methodology to create equivalent circuit models of the chokes for system-level simulations presented in this paper.…”

“…In this paper, we introduce and demonstrate a methodology to create, set up, and run an EMC simulation of power electronic converters. A state-of-the-art review of all EMC-critical components is given and a set of carefully developed component models is chosen [14][15][16][17][18][19][20] to build up an entire system-level model of industrial power converters. The used models not only accurately represent the EMC behavior of the power converter components, but also ensure stable and time-efficient simulations of the entire circuit.…”

Experimental evaluation of the relationship between dimensional dependencies of MnZn ferrites and filter inductor impedances

“…Thus, effective permittivity of MnZn ferrite is very high as was pointed out in literature. [ 22–25 ] That is, MnZn ferrite features very high effective permittivity, in addition to high relative permeability. Due to these properties, length of electromagnetic waves propagating in the core is greatly reduced.…”

“…A frequency band in which filter inductors work as inductive impedance are limited by frequency characteristics of magnetic materials with complex permeability [ 16 ] and self‐resonance caused by stray capacitance. [ 17,18 ] In addition, standing waves occur inside a magnetic core depending on its size, and dimensional resonance [ 19–25 ] causing sharp decrease of permeability also affects inductor impedance. Influence of this dimensional resonance is pronounced in MnZn ferrite widely used as inductor material for power reactors and EMI filters [ 19 ] due to the low cost, high permeability, and low loss.…”

Contents

“…The high frequency impulse current transmission path flows to the earth along the neutral point, and passes through the geometric center of the magnetic core to induce a high-frequency alternating electromagnetic field, thereby generating an exciting current on the coil and a pulse time that attenuates within a few nanoseconds. Previous studies have sampled the amplitude, phase, and frequency of a high frequency signal, and further localized, classified, and recognized the Phase Resolved Partial Discharge (PRPD) pattern [15][16][17][18][19][20].…”