平板变压器的设计详解.pdf

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Design of Planar Power Transformers Contents Introduction 3 Design procedure 4 Design examples -flyback 8 -forward 10 Formulas 13 Layer design 14 1 Ferroxcube Exploded view of a planar transformer 2 Ferroxcube Introduction Planar transformers can be constructed as stand alone components, with a stacked layer design or a small multilayer PCB, or integrated into a multilayer board of the 1/2 planar E core power supply. Important advantages of planar magnetics are: layer 1 - very low profile - excellent thermal characteristics. layer 2 - low leakage inductance - excellent repeat ability of properties multilayer PCB layer 3 Measurements on planar E core transformers under layer 4 operating conditions with windings in multilayer PCBs show that the thermal resistance is substantially lower (up to 50 %) compared to conventional wire wound transformers with the same effective core volume V . 1/2 planar E Core e This is caused by the improved surface to volume ratio. stand alone transformer

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