Saturable Ferrite Inductor Parameters Obtained through a Double Step Optimization

This paper deals with the modelling of ferrite inductors considering weak saturation operating conditions. The proposed methodology is based on a parametric representation of the magnetic characteristic of the inductor that is optimized through a double-step identification/optimization algorithm. The obtained magnetic characteristic is applied in a simulator to compute the inductor current. To demonstrate the effectiveness of this approach the inductor is tested in a DC-DC buck power converter. Two experimental cases are presented: the former regarding a low voltage, low current, MOSFETs buck converter; the second case regarding a 110W GaN-based buck converter up to 1MHz.