A SPICE behavioral model for current-controlled magnetic inductors

Abstract

A new SPICE-compatible behavioral model for magnetic controlled inductors was developed and verified experimentally. The new model is based on the gyrator-capacitor scheme in which the nonlinear permeance is emulated by a nonlinear capacitor that is built by using a 'transformer' circuit. The gyrator-capacitor approach can be used to evaluate an arbitrary magnetic circuit, and the nonlinear 'transformer' circuit makes possible the modeling the nonlinearity of the ferromagnetic core. The core saturation and hysteresis are reproduced by applying the core manufacturer's data. A current-controlled inductor was used to test the proposed model. Close agreement was obtained between the simulation and experimental results.