Edge effect analysis in a high-frequency transformer

An analysis of the edge effect in high-frequency transformers is performed by modeling the winding as either all-foil or wire-foil. The effects of the winding positions in the core and the winding widths on the AC resistance and leakage inductance of the transformer are investigated by using the two-dimensional finite element method (FEM). An optimal distance between the windings is found, which results in a minimum resistance for each particular frequency. It is demonstrated that the winding has the lowest AC resistance and leakage inductance when the primary and secondary have equal winding width