Method for Approximating Magnetic Core Power-Loss Density
by Dennis L Feucht
Magnetic cores used in switching power converters must be sized in the design of transductors (magnetic devices). How this is done is often empirical and based on previous experience. Magnetics design programs and inexperienced engineers cannot resort to this method and must have a more analytic basis for determining core size, as measured in core volume. Manufacturers give rules of thumb of 5 W to 15 W of conversion power per cm3 for most core shapes (and 30 W/cm3 for toroids). This can be used in a computer program for choosing a core, though it is somewhat crude.
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