Trends of power applications New ferrite materials and optimized core shapes

The field of power applications has been increased in the last 10 years in a wide range. New requirements have become more and more important such as: minimum power loss at high temperature; high saturation flux density with low temperature dependency; optimized ferrite materials for each application frequency range; and core shapes with homogeneous distribution of flux to avoid "hot spots". It is shown how these requirements are fulfilled by new developments in ferrite materials and core shapes and which are the criteria for selection. As further support to the application engineer, PC software is presented, which enables the user to calculate power losses coreshape/material related without using the "material data sheets", which are based on ring core measurements.