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Accurate Modeling of Inductors Working in Nonlinear Region in Switch-Mode Power Supplies with Different Load Currents

In this paper a nonlinear model is proposed to characterize ferrite-core inductors operating in saturation region in Switch-Mode Power Supplies (SMPSs). The model, identified through experimental measurements of inductor current and voltage, relates the inductance to the current flowing through the inductor and also to the SMPS load current. Results show that the model allows reproducing the inductor current with high accuracy, in different working conditions.