PROJECT TITLE :

Implementation of a Nonlinear Planar Magnetics Model

ABSTRACT:

A nonlinear lumped part model for planar magnetics is presented. This technique develops constant circuit model for multilayer planar magnetic parts using one-D analysis of Maxwell's equations. Conducting layers are represented as impedance networks, whereas the insulating regions are modeled as air-cored inductors. The equivalent circuit model is extended by representing the nonlinear magnetic core material as a nonlinear impedance whose magnetization characteristic relies on the Jiles-Atherton hysteresis model also modeling skin and proximity effects within the conductors and current distribution across windings, the improved model additionally integrates hysteresis loss of the magnetic core and saturation effects. The technique can be implemented in circuit simulation software. A prototype planar transformer, using printed circuit boards to mount windings, was characterised to validate the performance of the model. It's demonstrated that the developed nonlinear model additional accurately represents the characteristics of the experimental transformer compared to the existing linear lumped part model. This includes the effect of core saturation on the input current and output-voltage waveforms. The technique is generalized and can be applied to several topologies and geometries.