HYSTERESIS MODEL FOR SOFT FERRITES MNZN T AKING INTO ACCOUNT THE TEMPERATURE

A simple method is presented to introduce the temperature as a paramet er in a hysteresis model for soft ferrites which are used in power con version. The complete model requires only a few parameters as input. I t computes hysteresis losses and the characteristics B(H), phi(t) and d phi/dt. The computed results are compared with measured data for fou r MnZn soft ferrites used in power electronics, and a good agreement i s found for arbitrary excitation wave forms (symmetrical and asymmetri cal wave forms) for temperatures ranging from 40 degrees C to 140 degr ees C and for different values of the flux density [50 mT, 400 mT].