Abstract
To study the relationship of the winding resistance at high frequencies to the thickness of copper foils, we built a planar transformer for switching power supplies, using a multilayer printed wiring board. As a result, the optimal thickness of copper foils, t0, which provides the least copper loss, was experimentally shown. Moreover, we compared the experimental values with the calculated values, using a simplified analysis based on the assumption that the magnetic flux in the core window is parallel to the base of the core. For t0, the experimental values were found to agree satisfactorily with the calculated values. This method may therefore be effective for designing thin multilayer planar transformers.
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