Nonlinear magnetic features in power electronics applications, such as permeability and core loss, generate disagreement between magnetic component designs and prototypes, resulting in iterative magnetic design prototyping. To overcome this challenge, a bottom-up strategy based on magnetic material physics is presented. Using the KCL equations derived from the Landau-Lifshitz-Gilbert (LLG) equation, physical parameters (such as magnetic field, mutual coupling, and so on) are translated to comparable circuit parameters. To represent a magnetic material, a physics-based equivalent circuit for a single magnetic domain is then established. In ADS software, a fictional magnetic domain is employed for a preliminary inspection of the produced circuit model. After the test is successfully completed, the model is utilized for predicting the B-H loop of the commercial material TDK N87 toroidal core. The simulation and datasheet results are compared to validate the model's accuracy.
