Transformer

Patent metadata

Field	Value
Publication number	US-9640307-B2
Application number	US-201314648831-A
Country	US
Kind code	B2
Filing date	Oct 29, 2013
Priority date	Dec 27, 2012
Publication date	May 2, 2017
Grant date	May 2, 2017

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.

First claim

The invention claimed is:

1. A transformer comprising:
high-voltage coils including a wire wound around a cylindrical winding drum of a bobbin which is provided with flanges on both ends of the winding drum;
low-voltage coils formed of a flat plate member having an open ring shape, the low-voltage coils and high-voltage coils being alternately laminated in axial directions of the low-voltage coils and high-voltage coils; and
a cover member which has a ring plate shape and is coaxially laminated on an outside of a laminate in an axial direction,
wherein one of the low-voltage coils are disposed between one of the high-voltage coils and the cover member, and a first set of wall portions protruding in the axial direction from the bobbin of one of the high-voltage coils and wall portions protruding in the axial direction of the cover member are alternately disposed along an inner circumferential surface of one of the low-voltage coils to be positioned in a circumferential direction;
wherein the first set of wall portions of the bobbin of one of the high-voltage coils each have a height which is the same as a thickness of the low-voltage coils, and are formed at same intervals as each other;
wherein the wall portions of the cover member have a height which is the same as the height of the first set of wall portions of the bobbin of one of the high-voltage coils; and
wherein another one of the low-voltage coils are disposed such that they are sandwiched between the high-voltage coils, and a second set of wall portions of the bobbin of one of the high-voltage coils and the wall portions of the bobbin of another one of the high-voltage coils are fitted, the high-voltage coils being positioned so that a second set of wall portions of the bobbin of one of the high-voltage coils and the wall portions of the bobbin of another one of the high-voltage coils come into contact with inner circumferential surfaces of adjacent ones of another one of the low-voltage coils.

2. The transformer according to claim 1 , wherein two or more of the high-voltage coils are disposed in the axial direction, the low-voltage coils being disposed between the two or more high-voltage coils, and the wall portions of the bobbins of the two or more high-voltage coils being alternately disposed along the inner circumferential surface of the low-voltage coils to be positioned in the circumferential direction.

3. The transformer according to claim 1 , wherein in the low-voltage coils, two or more of the flat plate members each having the open ring shape are coaxially laminated with an insulation sheet interposed between the flat plate members.

4. The transformer according to claim 2 , wherein in the low-voltage coils, two or more of the flat plate members each having the open ring shape are coaxially laminated with an insulation sheet interposed between the flat plate members.

Assignees

• Fdk Corp

Inventors

• Miyamoto Masami
• Ikeda Yutaka
• Fujii Akihiro

Classifications

• H01F5/02 Primary

  wound on non-magnetic supports, e.g. formers · CPC title

• H01F2005/022

  wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications · CPC title

• H01F27/325

  Coil bobbins (formers for coils in general H01F5/02) · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title

• H01F2005/025

  wound on coaxial arrangement of two or more formers · CPC title