Skin efect with flyback SMPS transformers?

[treez]

Hello,

In a flyback SMPS, the primary current contains a DC component. Can we therefore say that the skin effect has no relevance to the DC part of the primary current? In other words, can we say that the DC component of the flyback transformer primary current will just as easily flow through the centre of the winding conductor as through its outer regions?

 

[FvM]

Of course. Windings AC resistance has to be determined for each harmonic component separately, considering skin and proximity effect. The values are independent, also the DC resistance doesn't change with AC current.