Integrated capacitor and inductor having co-located magnetic and electrical energy storage volumes

• US 9,424,984 B2
• Filed: 03/05/2014
• Issued: 08/23/2016
• Est. Priority Date: 03/05/2014
• Status: Active Grant

• Current Assignee: Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Original Assignee: Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Inventors: Ludois, Daniel
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): BROOKS, ANGELA D
• Application Number:
  US14/197,580
• Publication Number:
  US 20150255209A1
• Time in Patent Office: 902 Days
• US Class Current: 1/1
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 17/062 Toroidal core with turns of coil around it
• CPC Class Codes: H01F 27/40 Structural association with built-in electric component, e.g. fuse
• CPC Class Codes: H01F 3/02 made from sheets
• CPC Class Codes: H01G 4/005 Electrodes
• CPC Class Codes: H01G 4/008 Selection of materials
• CPC Class Codes: H01G 4/228 Terminals
• CPC Class Codes: H01G 4/232 electrically connecting two or more layers of a stacked or rolled capacitor
• CPC Class Codes: H01G 4/30 Stacked capacitors H01G4/33 takes precedence
• CPC Class Codes: H01G 4/35 Feed-through capacitors or anti-noise capacitors
• CPC Class Codes: H01G 4/40 Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations

Abstract

A combination capacitor and inductor employ a common volume for energy-storing electrical and magnetic fields thereby reducing the bulk of these components with respect to separate components of comparable value.

Claims

1. A combined inductor and capacitor comprising:

an inductor providing a conductor extending between a first and second terminal point through multiple loops defining a surrounded volume;

a capacitor positioned within the surrounded volume and providing a capacitor structure including opposed conductive plates attached, respectively, to a third and fourth terminal and an insulator separating the opposed conductive plates;

a high magnetic permeability material distributed within the capacitor structure comprised of at least one of a ferromagnetic and ferrimagnetic material;

wherein the first and second terminals are electrically separate from the third and fourth terminals;

wherein the conductive plates and insulator are together wound in a spiral; and

wherein the high magnetic permeability material operates to increase an inductance of the inductor by a factor of no less than 2 when compared to the inductance of the inductor without the high magnetic permeability material.

2. The combined inductor and capacitor of claim 1 wherein the high permeability material provides a permeability greater than that of nickel.

3. The combined inductor and capacitor of claim 2 wherein the conductive plates comprise a material selected from the group consisting of copper and aluminum.

4. The combined inductor and capacitor of claim 1 wherein the high permeability material is distributed in a plurality of layers in the capacitor structure.

5. The combined inductor and capacitor of claim 4 wherein the high permeability material is iron or an iron alloy with a nonferrous metal coating.

6. The combined inductor and capacitor of claim 1 wherein the high magnetic permeability material is a plurality of granules incorporating inter-granular gaps of low magnetic permeability.

7. The combined inductor and capacitor of claim 1 wherein the capacitor structure and the surrounded volume are toroids.

8. The combined inductor and capacitor of claim 1 wherein the conductive plates and insulator are wound in a spiral.

9. The combined inductor and capacitor of claim 1 wherein the capacitor plates extend substantially parallel to an axis of a magnetic field generated by the inductor when current passes through the inductor.

10. The combined inductor and capacitor of claim 1 wherein the inductor provides an inductance of at least 0.01 μ

H and the capacitor provides a capacitance of at least 0.0001 μ

F.

11. A combined inductor and capacitor comprising:

an inductor providing a conductor extending between a first and second terminal point through multiple loops defining surrounded volume;

a capacitor positioned within the surrounded volume and providing a capacitor structure including opposed conductive plates attached, respectively, to a third and fourth terminal and an insulator separating the opposed conductive plates;

a high magnetic permeability material distributed within the capacitor structure comprised of at least one of a ferromagnetic and ferrimagnetic material;

wherein the first and second terminals are electrically separate from the third and fourth terminals;

wherein the conductive plates and insulator are together wound in a spiral; and

wherein the insulator is a dielectric material increasing a capacitance of the capacitor by at least a factor of two when compared to the capacitor without the dielectric material.

12. The combined inductor and capacitor of claim 11 wherein the insulator is a polymer material.

13. The combined inductor and capacitor of claim 11 wherein the insulator incorporates a granular high magnetic permeability material selected from the group consisting of ferromagnetic materials and ferrimagnetic materials.

14. The combined inductor and capacitor of claim 11 wherein the capacitor structure and the surrounded volume are toroids.

15. The combined inductor and capacitor claim 11 wherein the conductive plates and insulator are wound in a spiral.

16. The combined inductor and capacitor of claim 11 wherein the capacitor plates extend substantially parallel to an axis of a magnetic field generated by the inductor when current passes through the inductor.

17. The combined inductor and capacitor of claim 11 wherein the inductor provides an inductance of at least 0.01 μ

H and the capacitor provides a capacitance of at least 0.0001 μ

F.