A wide bandwidth, dynamic hysteresis model for magnetization in soft ferrites

A wide bandwidth, dynamic model for the magnetization of the core material used in pulse transformers must be able to perform accurate circuit simulations involving such transformers. The authors have obtained such a model by combining the approaches used in the static hysteresis models of D.C. Jiles and D.L. Atherton (1983) and of B.D. Coleman and M.L. Hodgdon (1986), and adding two intuitively based dynamic parameters. This dynamic model gives reasonable simulations of experimental data for soft ferrite cores subjected to pulses with risetimes in the microsecond to nanosecond range. The parameters of the model are independent of the excitation. All but two dynamic parameters may be obtained from static hysteresis data.>