Soft magnetic ferrites and applications in telecommunication and power converters

Ferrite cores are mainly used in filters and broad-band transformers for telecommunication and increasingly in power converters. The requirements for the material properties are different for different applications and accordingly different compositions of the ferrite materials are used. Commercially available ferrites have been steadily improved in quality, though some outstanding properties which have been reported from laboratories a long time ago, are not yet available because of economical aspects. In many cases compromises have to be made, as the best properties cannot be combined in one material at the same time. The development of new core types and of coil formers which enable an automatic handling is of great importance for the application of ferrites. For power converters there exists a great variety of core types while the variation of the material properties is rather limited.