Loss Evaluation in Converter Transformer Cores

A new iron loss evaluation parameter ¿ is presented to predict large signal iron losses in metallic and ferrite cores on the basis of the results of small signal measurements. Calculated results using ¿ is remarkablly in coincidence with the observed iron losses in the frequency range from several tens kHz to 1MHz. An experimental study on the relation between eddy current and hysteresis losses and tape thickness of Supermalloy cores shows that there is an economical thickness which brings about a minimum iron loss under a given frequency and flux density. This result offers an economical approach selecting metallic tape core with most optimum thickness.