Liquid crystal inductor enhanced with magnetic nanoparticles

Patent metadata

Field	Value
Publication number	US-9767951-B2
Application number	US-201514793094-A
Country	US
Kind code	B2
Filing date	Jul 7, 2015
Priority date	Jul 7, 2015
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A method and apparatus for managing a magnetic permeability of a core. The apparatus comprises a core and a plurality of electrodes positioned relative to the core. The core comprises a plurality of liquid crystals and a plurality of magnetic nanoparticles. Changing a voltage applied to the plurality of electrodes changes a magnetic permeability of the core.

First claim

What is claimed is:

1. An apparatus comprising:
a core comprising a plurality of liquid crystals and a plurality of magnetic nanoparticles;
a plurality of electrodes positioned relative to the core, wherein changing a voltage applied to the plurality of electrodes changes a magnetic permeability of the core;
a conductor disposed around the core, wherein the core, the plurality of electrodes, and the conductor form an adjustable inductor; and
a dielectric substrate that serves as a base for the plurality of electrodes and the conductor, wherein the core is located in a channel within the dielectric substrate.

2. The apparatus of claim 1 , wherein changing the voltage applied to the plurality of electrodes changes the magnetic permeability of the core and thereby, an inductance of the adjustable inductor.

3. The apparatus of claim 1 , wherein the adjustable inductor belongs to at least one of a filtering circuit, an impedance matching circuit, or an impedance matching and filtering circuit.

4. The apparatus of claim 1 , further comprising:
a number of adjustable capacitors electrically connected to the adjustable inductor.

5. The apparatus of claim 1 further comprising:
a voltage controller that generates and controls the voltage, wherein changing at least one of a peak or a frequency of the voltage changes the magnetic permeability of the core.

6. The apparatus of claim 1 , wherein the voltage is an alternating current bias voltage.

7. The apparatus of claim 1 , wherein the plurality of electrodes comprises:
a first electrode positioned relative to a first end of the core; and
a second electrode positioned relative to a second end of the core.

8. An apparatus comprising:
an adjustable inductor comprising:
a core that comprises a fluid mixture of a plurality of liquid crystals and a plurality of magnetic nanoparticles;
a plurality of electrodes positioned relative to the core;
a conductor disposed around the core, wherein changing a voltage applied to the plurality of electrodes changes a magnetic permeability of the core and thereby, an inductance of the conductor; and
a dielectric substrate that serves as a base for the adjustable inductor, wherein the core is located in a channel within the dielectric substrate.

9. The apparatus of claim 8 , wherein the voltage is a first voltage and further comprising:
an adjustable capacitor comprising:
a capacitor core comprising a plurality of liquid crystals; and
a conductor system positioned relative to the capacitor core, wherein changing a second voltage applied to the conductor system changes a permittivity of the capacitor core and thereby, a capacitance of the conductor system.

10. The apparatus of claim 9 , wherein the conductor system comprises at least one of the plurality of electrodes positioned at ends of the capacitor core or a pair of conductive plates positioned around the core but dielectrically separated from the capacitor core.

11. The apparatus of claim 9
wherein the core of the adjustable inductor is located in a channel within the dielectric substrate; and wherein the adjustable inductor is one of a number of adjustable inductors associated with the dielectric substrate and the adjustable capacitor is one of a number of adjustable capacitors associated with the dielectric substrate.

12. The apparatus of claim 11 further comprising:
a voltage control system that generates and controls the first voltage applied to the plurality of electrodes of the adjustable inductor and that generates and controls the second voltage applied to the conductor system of the adjustable capacitor.

13. The apparatus of claim 12 , wherein the number of adjustable inductors, the number of adjustable capacitors, and the voltage control system form at least one of a filtering circuit, an impedance matching circuit, or an impedance matching and filtering circuit.

14. The apparatus of claim 13 , wherein the filtering circuit comprises at least one of a high-pass filter circuit, a low-pass filter circuit, a multi-pass filter circuit, an all-pass filter circuit, a band-pass filter circuit, or a notch filter circuit.

15. A method for managing a magnetic permeability of a core, the method comprising:
applying a voltage to a plurality of electrodes positioned relative to a core, wherein the core comprises a plurality of liquid crystals and a plurality of magnetic nanoparticles;
changing the voltage applied to the plurality of electrodes, wherein the magnetic permeability of the core changes as the voltage applied to the plurality of electrodes changes; and
changing a first alignment of the plurality of liquid crystals such that a second alignment of the plurality of magnetic nanoparticles changes to thereby change an inductance of a conductor disposed around the core.

16. The method of claim 15 , wherein changing the voltage comprises:
changing a first alignment of the plurality of liquid crystals such that a second alignment of the plurality of magnetic nanoparticles changes to thereby change the magnetic permeability of the core.

Assignees

• Boeing Co

Inventors

• Savage Larry Leon
• Williams John D
• Thacker Corey Mckinney
• Fortinberry Jarrod Douglas
• Bushey Preston Tyler

Classifications

• H01F29/08

  with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators · CPC title

• H01F27/24

  Magnetic cores · CPC title

• H01F27/255 Primary

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F21/08 Primary

  by varying the permeability of the core, e.g. by varying magnetic bias · CPC title

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title