Magnetic thin film inductors

• US 6,700,472 B2
• Filed: 12/11/2001
• Issued: 03/02/2004
• Est. Priority Date: 12/11/2001
• Status: Expired due to Fees

• Current Assignee: Intersil Americas LLC (Renesas Electronics Corporation)
• Original Assignee: Intersil Americas LLC (Renesas Electronics Corporation)
• Inventors: Wang, Xingwu, Yang, Chungsheng
• Primary Examiner(s): Mai, Anh
• Application Number:
  US10/014,045
• Publication Number:
  US 20030107463A1
• Time in Patent Office: 812 Days
• Field of Search: 336/200, 336/223, 336/232
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 17/06 with core substantially closed in itself, e.g. toroid
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

The present invention relates to inductors with improved inductance and quality factor. In one embodiment, a magnetic thin film inductor is disclosed. In this embodiment, magnetic thin film inductor includes a plurality of elongated conducting regions and magnetic material. The plurality of elongated conducting regions are positioned parallel with each other and at a predetermined spaced distance apart from each other. The magnetic material encases the plurality of conducting regions, wherein when currents are applied to the conductors, current paths in each of the conductors cause the currents to generally flow in the same direction thereby enhancing mutual inductance.

Claims

1. A magnetic thin film inductor comprising:

a conducting member having one or more turns; and

portions of magnetic material encasing the one or more turns of the conducting member, each portion of magnetic material encasing portions of the one or more turns that conduct current in a substantially uniform direction.

2. The magnetic thin film inductor of claim 1, wherein portions of the one or more turns that are curved are not encased with magnetic material.

3. The magnetic thin film inductor of claim 1, wherein the one or more turns of the conducting member are formed in an arbitrary shape.

4. The magnetic thin film inductor of claim 1, wherein the shape of the one or more turns of the conducting member is formed in a group consisting of square, rectangle, triangle, octagon, decagon and hexagon.

5. The magnetic thin film inductor of claim 1, further comprising:

a layer of insulator for each portion of magnetic material, the layer of insulator is formed between one or more turns of the conducting member and an associated portion of magnetic material.

6. The magnetic thin film inductor of claim 1, wherein the magnetic material is made of layers of different types of magnetic material.

7. The magnetic thin film inductor of claim 1, wherein the magnetic material is made from the group consisting of FeAlO, FeBN, FeBO, FeBC, FeCoBF, FeSiO, FeHfO, FeCoSiBO, FeSmO, FeAlBO, FeSmBO, FeCoSmO, FeZrO, FeNdO, FeYO, FeMgO, CoFeHfO, CoFeSiN, CoAlO, CoAlPdO, CoFeAlO, CoYO and CoFeBSiO.

8. The magnetic thin film inductor of claim 7, wherein the thickness of the magnetic material is in a range of about 0.1 to 1.5 micrometer.

9. The magnetic thin film inductor of claim 1, wherein each portion of magnetic material has a plurality of gaps to form sub-sections of magnetic material.

10. The magnetic thin film inductor of claim 9, wherein the one or more turns of the conducting member enter and exit select edges of the sub-sections in a generally perpendicular fashion.

11. The magnetic thin film inductor of claim 9, wherein the gaps in each portion of magnetic material are positioned at selected distances apart from each other.