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Planer Core
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Planar magnetics offer an attractive alternative to conventional core shapes when low profile magnetic devices are required. Basically this is a construction method of inductive components with windings made of printed circuit tracks or copper stampings separated by insulating sheets or constructed with multi-layer circuit boards.
Low AC copper losses and good coupling increase conversion efficiency.
Planar cores are very well suited for design of high performance power converters and inverters which required limit height.