RGSE-Based SPICE Model of Ferrite Core Losses

A SPICE model for estimating and simulating core losses of a ferrite magnetic device is presented. The approach is based on a proposed revised generalized Steinmetz equation (RGSE) and requires only the use of the Steinmetz coefficients and core geometry data. The letter presents a RGSE-based SPICE simulation strategy that can both estimate and simulate the effect of the core losses on the circuit. Primary advantages of RGSE approach are that it does not require switching frequency data and is applicable to arbitrary excitation and not just sinusoidal excitation as the Steinmetz equation approximation does. RGSE model is also insensitive to dc bias, this is an improvement over the earlier model. Comparison of previously reported measured and calculated core loss values with the simulation results of the presented SPICE RGSE model shows excellent agreement in the sinusoidal case and good agreement in the rectangular pulse case.