I am having some problems with understanding the calculation of core loss coefficient, K_fe. In the book 'Fundamental of power Electronics' By Robert W. Erickson, during the design procedure of Transformer for isolated Cuk converter, K_fe has been considered as 24.7 W/T_power(β) cm3 for 200 KHz ,β=2.6 for a ferrite pot core consisting of Magnetics, Inc. P-material. My question is, where did he get this value? Can anyone help me out ?
Thank you very much CataM. I know it depends on the frequency and the type of material of the core. The problem, my calculation doesn't match with the book. Obviously I am making some mistake. Here is my calculation
For P material of Magnetics for 200 Khz
at 70 mT core loss is 100mW/cm3
so what would be the K_fe ? Simple core loss divided by the flux density, right?
But according to the book it doesn't seems so and so far I know the k_fe depends on the material not on the type of core.