Inductor and dc-dc converter using the same

Patent metadata

Field	Value
Publication number	US-2024212920-A1
Application number	US-202318396244-A
Country	US
Kind code	A1
Filing date	Dec 26, 2023
Priority date	Dec 27, 2022
Publication date	Jun 27, 2024
Grant date	—

Abstract

In the inductor, when a voltage is applied via each terminal portion, a current flows through each of the first and second coil conductors. At this time, coupling may occur between the first and second coil conductors. However, since the first magnetic body is provided in the inductor, coupling between the first and second coil conductors is suppressed. In addition, since the pair of second magnetic bodies is additionally provided, high inductance can be realized.

First claim

1 . An inductor comprising:
an element body including a first body portion constituted of material containing magnetic material, the element body having a rectangular parallelepiped outer shape and having a pair of first side surfaces facing each other in a first direction, a pair of second side surfaces facing each other in a second direction perpendicular to the first direction, and a pair of third side surfaces facing each other in a third direction perpendicular to both the first direction and the second direction; a first coil conductor having a first conductor extending along the first direction in the element body, a second conductor extending along the first direction in the element body and adjacent to the first conductor in the second direction, and a third conductor extending along the second direction in the element body and connecting end portions on one side in the first direction of the first and second conductors; a second coil conductor aligned with the first coil conductor in the third direction, the second coil conductor having the first conductor, the second conductor, and the third conductor; a first magnetic body provided in the element body and having a magnetic permeability higher than that of the first body portion, the magnetic body having a rectangular parallelepiped outer shape and interposed between the first coil conductor and the second coil conductor in the third direction and having a pair of forth side surfaces facing each other in the first direction, a pair of fifth side surfaces facing each other in the second direction, and a pair of sixth side surfaces facing each other in the third direction; and a pair of second magnetic bodies provided in the element body and having a magnetic permeability higher than that of the first body portion, each of the second magnetic bodies having a rectangular parallelepiped outer shape, provided in an area different from an area where the first magnetic body is provided in a cross section perpendicular to the first direction, and having a pair of seventh side surfaces facing each other in the first direction, a pair of eighth side surfaces facing each other in the second direction, and a pair of ninth side surfaces facing each other in the third direction; wherein, in a cross section perpendicular to the first direction, the first element body portion of the element body is located at least outside of the first and second conductors of each of the first and second coil conductors in the second direction.

2 . The inductor according to claim 1 , wherein, in a cross section perpendicular to the first direction, the pair of second magnetic bodies are located outside the first and second conductors of each of the first and second coil conductors in the third direction, and extend along the second direction.

3 . The inductor according to claim 1 , wherein, in a cross section perpendicular to the first direction, the pair of second magnetic bodies are respectively located between the first and second conductors of each of the first and second coil conductors.

4 . The inductor according to claim 1 , wherein, in a cross section perpendicular to the first direction, the pair of second magnetic bodies includes a first portion located outside the first and second conductors of each of the first and second coil conductors in the third direction and extends along the second direction, and second portion located between the first and second conductors of each of the first and second coil conductors, the first portion and the second portion are connected to each other.

5 . The inductor according to claim 1 , wherein the fourth side surface located on one side in the first direction of the pair of fourth side surfaces of the first magnetic body and the seventh side surface located on one side in the first direction of the pair of seventh side surfaces of the second magnetic body are located on the other side in the first direction of the surface on one side of the third conductor of each of the first and second coil conductors.

6 . The inductor according to claim 1 , wherein the pair of fifth side surfaces of the first magnetic body and the pair of eighth side surfaces of the second magnetic body protrude outward from the first and second conductors of each of the first and second coil conductors, respectively, and are close to the pair of the second side surfaces of the element body.

7 . The inductor according to claim 1 , wherein, in a cross section perpendicular to the first direction, the first element body portion of the element body is further located outside the first and second magnetic bodies in the second direction.

8 . The inductor according to claim 7 , wherein protruding lengths of the pair of fifth side surfaces of the first magnetic body and the pair of eighth side surfaces of the second magnetic body from the first and second conductors of the first and second coil conductors are longer than lengths of the first element body portions of the element body located outside the first and second magnetic bodies in the second direction.

9 . The inductor according to claim 1 , wherein, in a cross section perpendicular to the first direction, lengths in the third direction of the first element body portion of the element body located outside the first and second conductors of each of the first and second coil conductors in the second direction are longer than lengths in the third direction of the first and second conductors of each of the first and second coil conductors.

10 . The inductor according to claim 1 , wherein in a cross section perpendicular to the first direction, the first and second conductors of each of the first and second coil conductors are in contact with the first magnetic body.

11 . The inductor according to claim 1 , wherein in a cross section perpendicular to the first direction, the first and second conductors of each of the first and second coil conductors are in contact with the second magnetic body.

12 . The inductor according to claim 1 , wherein, in a cross section perpendicular to the first direction, lengths of the first and second conductors of each of the first and second coil conductors in the second direction are longer than that in the third direction.

13 . The inductor according to claim 1 , wherein the third conductor of each of the first and second coil conductors is bent outward in the third direction from the first and second conductors.

14 . The inductor according to claim 1 , wherein lengths of the third portions of each of the first and second coil conductors in the third direction are longer than lengths of the first and second conductors of each of the first and second coil conductors in the second direction.

15 . The inductor according to claim 1 , wherein the first and second magnetic bodies are formed by stacking a plurality of magnetic ribbons made of amorphous ribbon or nanocrystalline ribbon in the first direction via an insulation layer.

16 . The inductor according to claim 1 , wherein the first and second magnetic bodies include a plurality of magnetic blocks, each of the magnetic blocks is formed by stacking in the first direction a plurality of magnetic ribbons made of amorphous ribbon or nanocrystalline ribbon via an insulation layer.

17 . The inductor according to claim 16 , wherein the plurality of magnetic body blocks are stacked in the first direction.

18 . The inductor according to claim 1 , wherein the pair of fifth side surfaces and the pair of sixth side surfaces of the first magnetic body and the pair of eighth side surfaces an

Assignees

• Tdk Corp

Inventors

• Kuroda Tomofumi

Classifications

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F27/30 Primary

  Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support · CPC title

• H01F27/2852

  Construction of conductive connections, of leads · CPC title

• H01F27/292

  Surface mounted devices · CPC title