Multi-Layer Barrel-Wound Foil Winding Design

Multi-layer windings can effectively decrease losses in high-frequency inductors and transformers in many applications. A simple way to achieve lower losses in barrel-wound foil windings for transformers, by incorporating multiple layers with proper interchange of layer positions to ensure the same flux and current in each layer, is introduced. This method of layer interchange has already been applied to toroidal inductors and in this paper it is shown how to modify it to apply it to barrel-wound foil windings such as windings on E-E cores, pot cores and U-U cores.