Inductive devices and methods of fabricating inductive devices

Patent metadata

Field	Value
Publication number	US-11935678-B2
Application number	US-202017117258-A
Country	US
Kind code	B2
Filing date	Dec 10, 2020
Priority date	Dec 10, 2020
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

An inductive device may be provided, including a first winding layer, a second winding layer arranged over the first winding layer and connected to the first winding layer to form a plurality of turns around a first axis, and a magnetic core arranged vertically between the first winding layer and the second winding layer. The magnetic core may include a portion entirely over the first winding layer and entirely under the second winding layer, where this portion may include a magnetic segment and a non-magnetic segment arranged laterally adjacent to each other along the first axis.

First claim

The invention claimed is:

1. An inductive device comprising:
a first winding layer;
a second winding layer arranged over the first winding layer and connected to the first winding layer to form a plurality of turns around a first axis; and
a magnetic core arranged vertically between the first winding layer and the second winding layer, wherein the magnetic core comprises a portion extending along the first axis, the portion entirely over the first winding layer and entirely under the second winding layer;
wherein the portion of the magnetic core comprises a first magnetic segment, a second magnetic segment and a non-magnetic,
wherein the non-magnetic segment is arranged laterally between the first magnetic segment and the second magnetic segment along the first axis,
wherein the non-magnetic segment separates the first magnetic segment from contacting the second magnetic segment,
wherein the non-magnetic segment includes a first side and a second side opposite the first side, the first side slanted at a first angle relative to the first axis, the second side slanted at a second angle relative to the first axis, the first side contacts the first magnetic segment and the second side contacts the second magnetic segment, and the non-magnetic segment has a tapered shape.

2. The inductive device of claim 1 , wherein a length of the first magnetic segment and a length of the second magnetic segment are approximately equal.

3. The inductive device of claim 1 , wherein the first winding layer comprises an overlap segment overlapping vertically with the second winding layer; and the non-magnetic segment is arranged to overlap vertically with approximately a middle of the overlap segment of the first winding layer.

4. The inductive device of claim 1 , wherein a length of each of the first magnetic segment and the second magnetic segment is greater than a length of the non-magnetic segment.

5. The inductive device of claim 1 , wherein the non-magnetic segment is a first non-magnetic segment, and wherein the portion of the magnetic core further comprises a third magnetic segment and a second non-magnetic segment arranged laterally between the second magnetic segment and the third magnetic segment.

6. The inductive device of claim 5 , wherein a length of the second magnetic segment is greater than a length of each of the first magnetic segment and the third magnetic segment.

7. The inductive device of claim 5 , wherein a length of each of the first magnetic segment, the second magnetic segment, and the third magnetic segment is greater than a length of each of the first non-magnetic segment and the second non-magnetic segment.

8. The inductive device of claim 1 , wherein the non-magnetic segment is a first non-magnetic segment, and the portion of the magnetic core further comprises a second non-magnetic segment; and
wherein the second magnetic segment is arranged laterally between the first non-magnetic segment and the second non-magnetic segment.

9. The inductive device of claim 8 , wherein a length of the second magnetic segment is greater than a length of each of the first non-magnetic segment and the second non-magnetic segment.

10. The inductive device of claim 1 , wherein the portion of the magnetic core comprises a third magnetic segment, and wherein the first magnetic segment and the third magnetic segment are arranged at respective ends of the portion of the magnetic core along the first axis.

11. The inductive device of claim 10 , wherein each of the first magnetic segment and the third magnetic segment comprises a part of a magnetic element extending laterally beyond the portion of the magnetic core.

12. The inductive device of claim 10 , wherein each of the first magnetic segment and the third magnetic segment comprises at least a part of a magnetic element including a first side surface and a second side surface opposite to the first side surface;
wherein the first side surface is slanted at an angle relative to the first axis and the second side surface is substantially perpendicular to the first axis.

13. The inductive device of claim 10 , wherein each of the first magnetic segment and the third magnetic segment comprises at least a part of a magnetic element including a first side surface and a second side surface opposite to the first side surface;
wherein each of the first side surface and the second side surface is slanted at an angle relative to the first axis so that the magnetic element has a trapezoidal shape.

14. The inductive device of claim 1 , wherein the inductive device further comprises an insulating layer within which the first winding layer, the second winding layer, and the magnetic core are arranged; and
wherein the non-magnetic segment of the portion of the magnetic core and the insulating layer comprise a same material composition.

15. The inductive device of claim 1 , wherein each of the first magnetic segment and the second magnetic segment comprises a part of a magnetic element extending laterally beyond the portion of the magnetic core.

16. The inductive device of claim 1 , wherein each of the first magnetic segment and the second magnetic segment comprises at least a part of a magnetic element including a first side surface and a second side surface opposite to the first side surface;
wherein the first side surface is slanted at an angle relative to the first axis and the second side surface is substantially perpendicular to the first axis.

Assignees

• Globalfoundries Sg Pte Ltd
• Globalfoundaries Singapore Pte Ltd

Inventors

• Syed Mohammed Zishan Ali
• Peng Lulu
• Cheng Chor Shu
• Ng Yong Chau
• Susai Lawrence Selvaraj

Classifications

• H10D1/20 Primary

  Inductors · CPC title

• H01F17/0013 Primary

  with stacked layers · CPC title

• H01F27/022

  Encapsulation · CPC title

• H01F27/28 Primary

  Coils; Windings; Conductive connections · CPC title

• H01L28/10

  Electricity · mapped topic