Energy Harvesting Using Frequency Rectification

• US 20090322184A1
• Filed: 09/21/2006
• Published: 12/31/2009
• Est. Priority Date: 09/23/2005
• Status: Abandoned Application

• Current Assignee: Dong Gun Lee, Gregory P. Carman
• Original Assignee: Dong Gun Lee, Gregory P. Carman
• Inventors: Carman, Gregory P, Lee, Dong Gun
• Application Number:
  US11/992,424
• Publication Number:
  US 20090322184A1
• Time in Patent Office: Days
• US Class Current: 310/339
• CPC Class Codes: H02N 2/186 Vibration harvesters
• CPC Class Codes: H10N 30/306 Cantilevers

Abstract

An energy harvesting apparatus includes an inverse frequency rectifier structured to receive mechanical energy at a first frequency, and a solid state electromechanical transducer coupled to the inverse frequency rectifier t receive a force provided by the inverse frequency rectifier. The force, when provided by the inverse frequency rectifier, causes the solid state transducer to be subjected to a second frequency that is higher than the first frequency to thereby generate electrical power.

Claims

1. An energy harvesting apparatus, comprising:

an inverse frequency rectifier structured to receive mechanical energy at a first frequency; and

a solid state electromechanical transducer coupled to said inverse frequency rectifier to receive a force provided by said inverse frequency rectifier,

wherein said force when provided by said inverse frequency rectifier causes said solid state transducer to be subjected to a second frequency that is higher than said first frequency to thereby generate electrical power.

2. The apparatus according to claim 1, wherein said inverse frequency rectifier is structured to receive mechanical energy at a a band of frequencies that includes said first frequency.

3. The apparatus according to claim 1, wherein said force provided by said inverse frequency rectifier is a periodic force having a period substantially equal to said first frequency.

4. The apparatus according to claim 1, wherein said force provided by said inverse frequency rectifier is a periodic force having a period greater than said first frequency.

5. The apparatus according to claim 1, wherein said mechanical energy comprises ambient movement.

6. The apparatus according to claim 1, wherein said inverse frequency rectifier is of a linear type.

7. The apparatus according to claim 1, wherein said inverse frequency rectifier is of a circular type.

8. The apparatus according to claim 1, wherein said inverse frequency rectifier includes a rack-and-pinion structure.

9. The apparatus according to claim 1, wherein said solid state electromechanical transducer comprises a piezoelectric material.

10. The apparatus according to claim 1, wherein said solid state electromechanical transducer comprises at least one of an electrostrictive material and a magnetostrictive material.

11. The apparatus according to claim 1, further comprising:

an electrical storage device coupled to receive said electrical power.

12. The apparatus according to claim 11, wherein said electrical storage device comprises a battery.

13. The apparatus according to claim 11, wherein said electrical storage device comprises a capacitor.

14. An electrical system, comprising:

an energy harvesting apparatus, comprising;

an inverse frequency rectifier structured to receive mechanical energy at a first frequency; and

a solid state electromechanical transducer coupled to said inverse frequency rectifier to receive a force provided by said inverse frequency rectifier,

wherein said force when provided by said inverse frequency rectifier causes said solid state transducer to be subjected to a second frequency that is higher than said first frequency to thereby generate electrical power; and

an electrical device coupled to receive said electrical power generated by said energy harvesting apparatus.

15. The system according to claim 14, wherein said electrical device comprises a sensor.

16. The system according to claim 14, wherein said electrical device comprises a communication device.

17. A method of harvesting electrical energy from an environment, comprising:

providing a mechanical structure adapted to be excited into a periodic motion at a first frequency upon being exposed to said environment; and

coupling said mechanical stricture to a solid state component to cause said solid state component to be excited into a periodic motion by a second frequency that is higher than said first frequency,

wherein said solid state component is suitable to generate electrical power at said second frequency when excited through coupling to said mechanical structure.

18. The method according to claim 17, further comprising:

storing electrical energy produced by said solid state component.

19. The method according to claim 17, further comprising:

powering an electrical device with electrical energy produced by said solid state component.