Nonlinear magnetic ring model based on impedance measurements with DC-bias current.

Area of Science:

• Electrical Engineering
• Materials Science
• Computational Electromagnetics

Background:

• Accurate modeling of nonlinear magnetic materials is crucial for advanced electronic designs.
• Existing models often fail to capture frequency dependence, hysteresis, and saturation effects comprehensively.

Purpose of the Study:

• To develop a complete and practical modeling methodology for nonlinear magnetic rings.
• To enable accurate time-domain simulations of magnetic components under various operating conditions.

Main Methods:

• Utilized frequency-domain impedance measurements (10 Hz - 10 MHz) under high DC bias currents (up to 800 A).
• Extended classical equivalent-circuit fitting to a two-dimensional impedance function (frequency and current).
• Formulated an implementable modeling framework realized as SPICE netlist code.

Main Results:

• Developed a validated nonlinear magnetic ring model capturing frequency dependence, hysteresis, and saturation.
• Demonstrated model validity through analytical verification, impedance measurements, and high-current experiments.
• Achieved consistency with a dedicated high-current test setup.

Conclusions:

• The presented methodology offers a novel, practical, and fully validated approach for nonlinear magnetic modeling.
• The SPICE implementation facilitates direct time-domain simulation, enhancing design flexibility.
• The model shows significant applicability and accuracy for real-world engineering problems.