Inductor and dc-dc converter

Patent metadata

Field	Value
Publication number	US-2025218645-A1
Application number	US-202419001920-A
Country	US
Kind code	A1
Filing date	Dec 26, 2024
Priority date	Dec 28, 2023
Publication date	Jul 3, 2025
Grant date	—

Abstract

An inductor includes a magnetic body having a corner portion and disposed such that the corner portion faces the connection conductor of the coil conductor, and a resin member disposed between the magnetic body and the first conductor of the coil conductor, in which at least one conductor of the first conductor and the second conductor has a first recessed portion recessed from an inside to an outside at a position adjacent to the connection conductor, and a dimension of the first recessed portion in a third direction intersecting the first and second directions is equal to or larger than a dimension of a conductor having a shorter dimension in the third direction, of the one conductor and the other conductor, in the third direction.

First claim

What is claimed is:

1 . An inductor comprising:
a coil conductor including a first conductor extending in a first direction, a second conductor extending in a second direction intersecting the first direction, and a connection conductor connecting one end portion of the first conductor and one end portion of the second conductor; a magnetic body having a corner portion and disposed such that the corner portion faces the connection conductor of the coil conductor; and a resin member disposed between the magnetic body and the first conductor of the coil conductor, wherein at least one conductor of the first conductor and the second conductor has a first recessed portion recessed from an inside to an outside at a position adjacent to the connection conductor, and a dimension of the first recessed portion in a third direction intersecting the first and second directions is equal to or larger than a dimension of a conductor having a shorter dimension in the third direction, of the one conductor and the other conductor, in the third direction.

2 . The inductor according to claim 1 , wherein at least a part of the resin member is accommodated in the first recessed portion.

3 . The inductor according to claim 1 , wherein the first conductor and the second conductor each have the first recessed portion recessed from the inside to the outside at a position adjacent to the connection conductor.

4 . The inductor according to claim 1 , wherein
the connection conductor has a second recessed portion recessed from the inside to the outside, and the second recessed portion of the connection conductor communicates with the first recessed portion of the at least one conductor.

5 . The inductor according to claim 1 , wherein a length dimension of the first recessed portion of the second conductor in the second direction is larger than a thickness of the resin member.

6 . The inductor according to claim 1 , wherein a depth of the first recessed portion of the at least one conductor is smaller than half of a thickness dimension of the at least one conductor.

7 . The inductor according to claim 1 , wherein
the second conductor and the magnetic body are in close contact with each other via an adhesive layer, and an inner curvature radius of the connection conductor is smaller than a thickness of the adhesive layer.

8 . The inductor according to claim 1 , wherein an inner curvature radius of the connection conductor is smaller than a thickness of the resin member.

9 . The inductor according to claim 1 , wherein
an outer side of the connection conductor has a curved shape, and a length dimension of the first recessed portion of the second conductor in the second direction is smaller than a curvature radius of the curved shape of the connection conductor.

10 . The inductor according to claim 1 , wherein
an outer side of the connection conductor has a curved shape, and a length dimension of the first recessed portion of the first conductor in the first direction is smaller than a curvature radius of the curved shape of the connection conductor.

11 . The inductor according to claim 1 , wherein
the coil conductor includes a third conductor extending in the second direction, a fourth conductor connecting the other end portion of the second conductor and one end portion of the third conductor, and a fifth conductor connected to the other end portion of the third conductor and extending in the first direction, and the magnetic body is placed on the first conductor and the fifth conductor via the resin member.

12 . A DC-DC converter comprising the inductor according to claim 1 .

Assignees

• Tdk Corp

Inventors

• Kuroda Tomofumi
• Kuwajima Hajime
• Koyama Atsushi
• Aiba Haruka

Classifications

• H02M3/155

  using semiconductor devices only · CPC title

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F27/306

  Fastening or mounting coils or windings on core, casing or other support · CPC title

• H01F27/324 Primary

  Insulation between coil and core, between different winding sections, around the coil; Other insulation structures · CPC title

• H02M3/003

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title