公开(公告)号：US09640307B2

公开(公告)日：2017-05-02

申请号：US14648831

申请日：2013-10-29

Applicant: FDK CORPORATION

Inventor： Masami Miyamoto ,  Yutaka Ikeda ,  Akihiro Fujii

IPC: H01F27/30 ,  H01F27/29 ,  H01F27/28 ,  H01F5/02 ,  H01F30/00 ,  H01F27/32

CPC classification number: H01F5/02 ,  H01F27/2823 ,  H01F27/325 ,  H01F30/00 ,  H01F2005/022 ,  H01F2005/025

Abstract: A transformer in which the high-voltage and low-voltage coils are easily laminated when they are alternately laminated in their axial directions, improving power efficiency. The transformer includes: a high-voltage coil including a wire wound around a cylindrical winding drum of a bobbin which is provided with flanges on both ends of the winding drum; a low-voltage coil formed of a flat plate member having an open ring shape, the low-voltage and high-voltage coils being alternately laminated in their axial directions; and a cover member which has a ring plate shape and is coaxially laminated on an outside of a laminate in an axial direction. The low-voltage coil is between the high-voltage coil and the cover member, and a wall portion protruding in the axial direction from the bobbin of the high-voltage coil and a wall portion protruding in the axial direction of the cover member are alternately disposed.