SELF-POWERED PORTABLE ELECTRONIC DEVICE

• US 20070257634A1
• Filed: 05/07/2007
• Published: 11/08/2007
• Est. Priority Date: 05/05/2006
• Status: Abandoned Application

• Current Assignee: Advanced Cerametrics, Inc.
• Original Assignee: Advanced Cerametrics, Inc.
• Inventors: Mohammadi, Farhad, Cass, Richard, Leschin, Stephen
• Application Number:
  US11/745,222
• Publication Number:
  US 20070257634A1
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H02J 7/32 for charging batteries from a charging set comprising a non-electric prime mover rotating at constant speed
• CPC Class Codes: H02N 2/18 producing electrical output from mechanical input, e.g. generators for measurement devices G01
• CPC Class Codes: H10N 30/30 with mechanical input and electrical output, e.g. functioning as generators or sensors
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

The present invention is directed to devices, systems, and methods having energy harvesting capabilities for self-powering portable electronic devices. The energy harvesting system preferably includes piezoelectric ceramic fibers that harvest mechanical energy to provide electrical energy or power to operate one or more features of the portable electronic device. The piezoelectric ceramic fibers may be in and/or on a structure of a portable electronic device and/or auxiliary devices/structures associated with a portable electronic device. The piezoelectric ceramic fibers allow generation of charge from mechanical inputs seen in everyday use of the portable electronic device and provide for the collection of generated energy. The energy harvesting capabilities also provide for conversion and storage of the harvested energy as electrical energy that may be used for powering one or more features of the portable electronic device. The piezoelectric ceramic fiber energy harvesting system may reduce and/or eliminate the need for external power sources and/or battery power.

Claims

1. A self-powered electronic device comprising:

a housing;

one or more electrical components disposed in said housing wherein one or more of said one or more electrical components comprise electrical loads;

electrical circuitry associated with operation of said self-powered electronic device, said electrical circuitry electrically connecting said one or more electrical components;

a piezoelectric ceramic material electrically coupled to one or more of said electrical loads of said self-powered electronic device, wherein said piezoelectric ceramic material harvests and converts mechanical energy into electrical energy for powering one or more of said electrical loads.

2. The device of claim 1, wherein the one or more electrical components further comprise low or ultra low power electronics.

3. The device of claim 1, wherein said piezoelectric ceramic material harvests and converts mechanical energy into electrical energy for powering one or more of said electrical loads without use of an external power supply and/or a replaceable battery.

4. The device of claim 1, further comprising an energy harvesting system for capturing usable amount of electric energy from ambient sources of mechanical energy associated with handling and operation of said self-powered electronic device.

5. The device of claim 1, wherein said piezoelectric ceramic material generates an electrical charge in response to an applied mechanical energy input resulting from one or more of human activity and/or operation of said self-powered electronic device.

6. The device of claim 1, wherein said piezoelectric ceramic material further comprises piezoelectric ceramic fibers.

7. The device of claim 6, wherein said piezoelectric ceramic fibers further comprise one or more of:

a piezoelectric fiber composite (PFC);

a piezoelectric fiber composite bimorph (PFCB); and

/or a piezoelectric multilayer composite (PMC).

8. The device of claim 1, wherein said piezoelectric ceramic material further comprises one or more of:

fibers, rods, foils, composites, and multi-layered composites.

9. The device of claim 1, further comprising a piezoelectric energy harvesting system, wherein said piezoelectric energy harvesting system further comprises:

said piezoelectric ceramic material; and

electrical circuitry electrically connecting said piezoelectric ceramic material to said one or more electrical loads, wherein said piezoelectric energy harvesting system reduces a dependency of said self-powered electronic device on external and/or replaceable power supplies.

10. The device of claim 9, wherein said piezoelectric energy harvesting system eliminates any dependency of said self-powered electronic device on external and/or replaceable power supplies

11. The device of claim 1, wherein said piezoelectric ceramic material further comprises flexible, high charge piezoelectric ceramic fibers produced using Viscose Suspension Spinning Process (VSSP).

12. The device of claim 1, wherein said piezoelectric ceramic material further comprise user defined shapes and/or sizes.

13. The device of claim 1, wherein said piezoelectric ceramic material is one or more of:

embedded within, disposed within, and/or attached to said self-powered electronic device.

14. The device of claim 1, further comprising:

a device or structure associated with said self-powered electronic device;

wherein said piezoelectric ceramic material is one or more of;

embedded within, disposed within, and/or attached to said device or structure associated with the self-powered electronic device; and

electrical circuitry electrically coupling said self-powered electronic device to said device or structure associated with said self-power electronic device; and

wherein said self-powered electronic device receives a charge from said device or structure associated with said self-power electronic device.

15. The device of claim 4, wherein said energy harvesting system further comprises:

an energy storage device electrically coupled to said piezoelectric ceramic material for storing harvested energy; and

a rectifier electrically coupled between said energy storage device and said piezoelectric ceramic material, wherein said rectifier converts energy from alternating current (AC) to direct current (DC) prior to storage in said energy storage device.

16. The device of claim 6, wherein said piezoelectric ceramic fibers are positioned and oriented such that mechanical energy input is substantially in a direction parallel to a longitudinal axis of said fibers.

17. The device of claim 6, wherein said piezoelectric ceramic fibers are positioned and oriented to maximize a longitudinal length of said fibers.

18. The device of claim 6, wherein said piezoelectric ceramic fibers are positioned and oriented to maximize a number and concentration of said fibers.

19. The device of claim 6, wherein said piezoelectric ceramic fibers are oriented in parallel array with a poling direction of said fibers being in the same direction.

20. The device of claim 6, wherein adjacent piezoelectric ceramic fibers are in contact with one another.

21. The device of claim 6, wherein said piezoelectric ceramic fibers are oriented in a star array having a center and individual fibers extending outward from said center, wherein a poling direction of said fibers is toward said center of said star array.

22. A self-powered, portable electronic device comprising:

a housing;

ultra low power electronics housed within the housing; and

high charge piezoelectric ceramic fibers and/or fiber composites embedded within, disposed within, or attached to said portable electronic device, wherein said piezoelectric ceramic fibers and/or fiber composites harvest increased deliverable power from mechanical inputs to said portable electronic device;

wherein said piezoelectric ceramic fibers and/or fiber composites are electrically coupled to said ultra low power electronics to power said ultra low power electronics; and

wherein integration and convergence of ultra low power electronics and high charge piezoelectric ceramic fibers and/or fiber composites enable said portable electronic device to be partially or fully self-powered.

23. A method of self-powering an electronic device comprising:

(a) incorporating an energy harvesting system comprising a piezoelectric ceramic material into a portable electronic device;

(b) positioning and orienting the piezoelectric ceramic material at one or more mechanical energy input points;

(c) generating a charge in the piezoelectric ceramic material from a mechanical energy input at the mechanical energy input points,

(d) powering a load from the charge generated in the piezoelectric ceramic material.

24. The method of claim 23, wherein the load is powered directly from the charge generated in the piezoelectric ceramic material.

25. The method of claim 23 further comprising the step of collecting the charge from the piezoelectric ceramic material using electrical circuitry.

26. The method of claim 25 further comprising the step of storing the charge from the piezoelectric ceramic material in an energy storage device.

27. The method of claim 26, wherein the load is powered using the stored energy.

28. The method of claim 23, wherein the mechanical energy is input through normal use of the portable electronic device.

29. The method of claim 23, wherein the piezoelectric ceramic material comprises piezoelectric ceramic fibers.

30. The method of claim 29, wherein the piezoelectric ceramic fibers comprise one or more of:

a piezoelectric fiber composite (PFC);

a piezoelectric fiber composite bimorph (PFCB); and

/or a piezoelectric multilayer composite (PMC).

31. A self-powered, portable electronic device comprising:

a housing;

electronics housed within the housing;

a piezoelectric ceramic material for harvesting increased deliverable power from mechanical inputs to the portable electronic device, wherein the piezoelectric ceramic material is electrically coupled to the electronics to power the electronics.

32. The device of claim 31, wherein the piezoelectric ceramic material comprises piezoelectric ceramic fibers.

33. The device of claim 32, wherein the piezoelectric ceramic fibers comprise one or more of:

a piezoelectric fiber composite (PFC);

a piezoelectric fiber composite bimorph (PFCB); and

/or a piezoelectric multilayer composite (PMC).

34. The device of claim 31, wherein the electronics are ultra low power electronics.

35. The device of claim 34, wherein integration and convergence of the ultra low power electronics and the piezoelectric ceramic material enables the self-powered, portable electronic device.