POWER TRANSFORMER, AND POWER-SUPPLY DEVICE USING THE SAME

PROBLEM TO BE SOLVED: To provide a power transformer capable of reducing size, thickness and height, high in reliability of a joint part of a mounted component, and facilitating division into multiple pieces and assembly of the transformer. SOLUTION: On a primary board 12 formed with primary coils 14 and a secondary board 20 formed with secondary coils 22, holes 34A-34C, 40A-40C for inserting legs of cores 16, 24 therein are formed at the center parts and in outsides of the primary coils 14 and the secondary coils 22. When composing this transformer 32 by combining members with the cores 16, 24 inserted in the primary board 12 and the secondary board 20, respectively, with each other, an insulation sheet 26 larger than formation regions of the primary coils 14 and the secondary coils 22 is arranged between the primary board 12 and the secondary board 20, thereby the primary side and the secondary side are completely insulated and isolated from each other, and the distances between the cores and conductor patterns are reduced to allow miniaturization. Since the insulation sheet 26 acts as a gap between the cores 16 and 24, the thickness of the transformer can be reduced. COPYRIGHT: (C)2011,JPO&INPIT