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Foil windings are preferable in high-current high-power inductors to realize compact designs and to reduce dc-current losses. At high frequency, however, proximity effect will cause very significant increase in ac resistance in multi-layer windings, and lead to high ac winding losses. This paper presents design, analysis and experimental verification of a two winding technique, which significantly...
AC-losses in gapped-core planar inductor windings seem to be dominated by eddy losses induced by the time varying fringing flux near the air gap. Shaping the windings in the region of the gap reduces AC-losses but the reduction in width of planar foil conductors causes the DC-resistance to increase. The winding shape can be optimized using FEM-tools but the process is very time consuming. If the DC-resistance...
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