| 摘要 |
A power transformer is provided to reduce the variation of the sound pressure of a buzzing noise without lowering the magnetic coupling of a primary winding and a secondary winding. A bobbin(13) includes a magnetic core insertion hole(13c), a trunk unit(13a), and a plurality of bases(13b). The trunk unit includes a wire winding region. The wire winding region is divided into a plurality of regions by an intermediate flange. The plurality of bases are connected to both ends of the trunk unit. The primary winding(11) is wound around one region of the trunk unit. Both ends of the primary winding are connected to a different connection terminal(14) of at least one base. A secondary winding(12) is wound around other region of the trunk unit. Both ends of the secondary winding are connected to the different connection terminal of at least one base. A pair of cores(15) magnetically couples the primary winding and the second winding.
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