ABSTRACT
Transformers are used in the conversion process in power electronics which generally constitute the heaviest and bulkiest component in the conversion circuit. Powder cores are components obtained by compressing metallic powders which are electrically insulated from each other by an insulation layer at the particulate surface providing a distributed air gap in the final material. Mixed powders are compacted in a mold applying an external pressure to deform them which eventually leads to shape and dimensional control in the final component. Thermal behavior of powder core materials is another important issue in core material selection and design. The gradual or “soft” saturation characteristic of powder core materials can also be observed through the change of their initial permeability under depolarisation current (DC) bias condition. High flux powder cores are superior to Molybdenum permalloy powder cores in terms of their DC bias behavior and saturation flux density level.
