Planar inductor devices

• US 8,358,193 B2
• Filed: 04/14/2011
• Issued: 01/22/2013
• Est. Priority Date: 05/26/2010
• Status: Active Grant

• Current Assignee: TE Connectivity Solutions GmbH (TE Connectivity Limited)
• Original Assignee: Tyco Electronics Corporation (TE Connectivity Limited)
• Inventors: Dalmia, Sidharth, Vannala, Shanit, Sun, Zhuowen, Kubes, Steven R.
• Primary Examiner(s): NGUYEN, TUYEN T
• Application Number:
  US13/086,981
• Publication Number:
  US 20110291787A1
• Time in Patent Office: 649 Days
• Field of Search: 336/65, 336/83, 336/200, 336/225, 336/229, 336/232, 336220-223
• US Class Current: 336/229
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 17/062 Toroidal core with turns of coil around it
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 5/003 Printed circuit coils

Abstract

A planar inductor device includes a ferrite body and a conductive pathway, The ferrite body extends around an opening in the ferrite body. The conductive pathway includes an input section, a current-splitting section, a coil section, a current-combining section, and an output section connected with each other, the input section extending toward the opening in the ferrite body. The current-splitting section includes a plurality of conductive coils joined with the conductive pathway and electrically disposed parallel to each other. The coil section includes the conductive coils helically wrapped around the ferrite body. The current-combining section includes the conductive coils joined with each other. The output section includes the joined conductive coils extending out of the ferrite body.

Claims

1. A planar inductor device comprising:

a ferrite body extending around an opening in the ferrite body; and

a conductive pathway comprising an input section, a current-splitting section, a coil section, a current-combining section, and an output section connected with each other, the input section extending toward the opening in the ferrite body, the current-splitting section including a plurality of conductive coils joined with the conductive pathway and electrically disposed parallel to each other, the coil section including the conductive coils helically wrapping around the ferrite body, the current-combining section including the conductive coils joining with each other, and the output section including the joined conductive coils extending out of the ferrite body.

2. The device of claim 1, wherein the input section of the conductive pathway conveys electric current (I) toward the ferrite body, the current-splitting section divides the electric current (I) into first and second current fractions (I₁, I₂), the coil section separately conveys the first and second current fractions (I₁, I₂) around the ferrite body in the different conductive coils, the current-combining section combines the first and second current fractions (I₁, I₂) into a combined electric current, and the output section conveys the combined electric current out of the device.

3. The device of claim 1, wherein the input section of the conductive pathway includes a planar input conductor disposed above the ferrite body, the current-splitting section of the conductive pathway includes a planar current-splitting conductor disposed below the ferrite body, the current-combining section of the conductive pathway includes a planar current-combining conductor disposed above the ferrite body, and the output section of the conductive pathway includes a planar output conductor disposed below the ferrite body.

4. The device of claim 3, wherein the conductive pathway includes one or more conductive input vias conductively coupling the input conductor with the current-splitting conductor.

5. The device of claim 4, wherein the input vias are disposed within the opening of the ferrite body.

6. The device of claim 3, wherein the conductive pathway includes one or more conductive current-splitting vias conductively coupling the current-splitting conductor with the current-combining conductor.

7. The device of claim 6, wherein the current-splitting vias are disposed outside of the ferrite body.

8. The device of claim 3, wherein the conductive pathway includes one or more conductive current-combining vias conductively coupling the current-splitting conductor with the output conductor.

9. The device of claim 1, wherein the ferrite body is divided into a plurality of separate sections.

10. The device of claim 9, further comprising a buffer layer disposed between the separate sections of the ferrite body, the buffer layer including at least one of a non-conductive material or a non-magnetic material.

11. The device of claim 1, further comprising one or more wire bonds coupled with at least one of the input section, the current-splitting section, the coil section, the current-combining section, or the output section.

12. The device of claim 1, further comprising a substrate extending from an upper surface to an opposite lower surface, the ferrite body disposed within the substrate between the upper surface and the lower surface.

13. A planar inductor device comprising:

a substrate vertically extending between an upper surface and an opposite lower surface;

a ferrite body disposed in the substrate between the upper surface and the lower surface, the ferrite body having an opening that extends through the ferrite body;

an input conductor disposed between the ferrite body and the upper surface of the substrate;

a current-splitting conductor disposed between the ferrite body and the lower surface of the substrate;

one or more conductive input vias coupled with both the input conductor and the current-splitting conductor;

a current-combining conductor disposed between the ferrite body and the upper surface of the substrate; and

one or more current-splitting vias coupled with both the current-splitting conductor and the current-combining conductor, wherein the input conductor, the current-splitting conductor, the current-combining conductor, the input vias, and the current-splitting vias form a conductive pathway that extends into the opening in the ferrite body and forms a plurality of conductive coils that each helically wrap around the ferrite body before combining back together and extending out of the opening in the ferrite body.

14. The device of claim 13, wherein the conductive coils of the conductive pathway are electrically disposed parallel to each other.

15. The device of claim 13, wherein the input conductor conveys electric current (I) toward the ferrite body, the current-splitting vias and the current-splitting conductor divide the electric current (I) into first and second current fractions (I₁, I₂) and convey the first and second current fractions (I₁, I₂) helically around the ferrite body, and the current-combining vias and the current-combining conductor combine the first and second current fractions (I₁, I₂) into a combined electric current that is conveyed out of the device.

16. The device of claim 13, wherein the input vias are disposed within the opening of the ferrite body.

17. The device of claim 13, wherein the current-splitting vias are disposed outside of the ferrite body.

18. The device of claim 13, wherein the ferrite body is divided into a plurality of separate sections such that the ferrite body is a non-continuous body.

19. The device of claim 18, further comprising a buffer layer disposed between the separate sections of the ferrite body, the buffer layer including at least one of a non-conductive material or a non-magnetic material.

20. The device of claim 13, further comprising one or more wire bonds coupled with at least one of the input conductor, the current-splitting conductor, or the current-combining conductor.