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Having many advantages compared to classic wire wound technology; planar magnetic components are largely used. Modeling tools are required to help designers for less time consuming conception. Nevertheless, number of adapted modeling solutions is limited by the complexity of such geometries. The determination of appropriate description (2D or 3D) for eddy currents modeling and by this way AC copper losses evaluation are investigated in this paper. The validity of the approach is successfully presented on an industrial application from the current evaluation until thermal simulations.