Electrical power extraction from mechanical disturbances

• US 6,580,177 B1
• Filed: 06/01/1999
• Issued: 06/17/2003
• Est. Priority Date: 06/01/1999
• Status: Expired due to Term

• Current Assignee: Polatis Photonics, Inc.
• Original Assignee: Continuum Controls Corporation
• Inventors: Hagood, Nesbitt W. IV, Ghandi, Kamyar
• Primary Examiner(s): Ponomarenko, Nicholas
• Application Number:
  US09/323,739
• Time in Patent Office: 1,477 Days
• Field of Search: 310/319, 310/338, 290/312, 290/1.R
• US Class Current: 290/1.00R
• CPC Class Codes: H02N 2/181 Circuits; Control arrangements or methods

Abstract

A method of extracting power includes coupling a transducer that converts mechanical power to electrical power to a disturbance; coupling an electrical circuit to the transducer such that a peak voltage experienced by the transducer is greater than two times higher than any peak voltage of an open circuit transducer due to the disturbance alone; extracting power from the transducer using the electrical circuit, and storing extracted power. Power is extracted from the transducer and applied to the transducer during different intervals in the course of the disturbance. A system for extracting power includes a transducer, an electrical circuit, and a storage element for storing extracted power.

Claims

1. A method of extracting power, comprising the steps of:

coupling a transducer that converts mechanical power to electrical power to a disturbance,

coupling an electrical circuit to the transducer such that a peak voltage experienced by the transducer is greater than two times higher than any peak voltage of an open circuit transducer due to the disturbance alone, wherein coupling the electrical circuit includes controlling switches electrically connected to the transducer,

extracting power from the transducer using the electrical circuit, and

storing extracted power.

2. The method of claim 1 further comprising applying stored extracted power to an external load.

3. The method of claim 1 wherein the step of coupling the electrical circuit includes applying stored extracted power to the transducer.

4. The method of claim 1 wherein the step of coupling the electrical circuit includes coupling a resonant circuit to the transducer.

5. The method of claim 1 wherein controlling switches includes controlling a duty cycle of the switches.

6. The method of claim 1 wherein the step of controlling includes monitoring a system state.

7. The method of claim 6 wherein controlling switches includes controlling a duty cycle of the switches based on the system state.

8. The method of claim 1 wherein the step of coupling the electrical circuit acts to increase oscillations of the disturbance.

9. The method of claim 1 wherein the step of coupling the electrical circuit acts to dampen oscillations of the disturbance.

10. The method of claim 1 wherein the step of coupling the transducer includes coupling a plurality of transducers to the disturbance.

11. The method of claim 1 wherein the step of coupling the transducer includes attaching the transducer to a structure.

12. A method of extracting power, comprising the steps of:

coupling a transducer that converts mechanical power to electrical power to a disturbance,

coupling an electrical circuit to the transducer such that a peak of the integral of the current onto and off the transducer is greater than two times higher than any peak of an integral of a current of a short circuit transducer due to the disturbance alone, wherein coupling the electrical circuit includes controlling switches electrically connected to the transducer,

extracting power from the transducer using the electrical circuit, and

storing extracted power.

13. The method of claim 12 further comprising applying extracted power to an external load.

14. The method of claim 12 wherein the step of coupling the electrical circuit includes applying extracted power to the transducer.

15. The method of claim 12 wherein the step of coupling the electrical circuit includes coupling a resonant circuit to the transducer.

16. The method of claim 14 wherein controlling switches includes controlling a duty cycle of the switches.

17. The method of claim 14 wherein the step of controlling includes monitoring a system state.

18. The method of claim 17 wherein controlling switches includes controlling a duty cycle of the switches based on the system state.

19. The method of claim 12 wherein the step of coupling the electrical circuit acts to increase oscillations of the disturbance.

20. The method of claim 12 wherein the step of coupling the electrical circuit acts to dampen oscillations of the disturbance.

21. The method of claim 12 wherein the step of coupling the transducer includes coupling a plurality of transducers to the disturbance.

22. The method of claim 12 wherein the step of coupling the transducer includes attaching the transducer to a structure.

23. A method of extracting power, comprising the steps of:

coupling a transducer that converts mechanical power to electrical power to a disturbance,

measuring a mechanical state with a sensor,

controlling an electrical circuit coupled to the transducer based on the measured mechanical state,

extracting power from the transducer using the electrical circuit, and

storing extracted power.

24. The method of claim 23 further comprising applying extracted power to an external load.

25. The method of claim 23 wherein the step of coupling the electrical circuit includes applying extracted power to the transducer.

26. The method of claim 23 wherein the step of coupling the electrical circuit includes coupling a resonant circuit to the transducer.

27. The method of claim 23 wherein the step of coupling the electrical circuit includes controlling switches electrically connected to the transducer.

28. The method of claim 27 wherein controlling switches includes controlling a duty cycle of the switches.

29. The method of claim 23 wherein the step of coupling the electrical circuit acts to increase oscillations of the disturbance.

30. The method of claim 23 wherein the step of coupling the electrical circuit acts to dampen oscillations of the disturbance.

31. The method of claim 23 wherein the step of coupling the transducer includes coupling a plurality of transducers to the disturbance.

32. The method of claim 23 wherein the step of coupling the transducer includes attaching the transducer to a structure.

33. A method of extracting power, comprising the steps of:

coupling a transducer that converts mechanical power to electrical power to a disturbance,

coupling an electrical circuit to the transducer,

controlling switches of the electrical circuit such that the switches switch at a frequency greater than two times an excitation frequency of the disturbance,

extracting power from the transducer using the electrical circuit, and

storing extracted power,

wherein coupling the electrical circuit includes applying extracted power to the transducer.

34. The method of claim 33 further comprising applying extracted power to an external load.

35. The method of claim 33 wherein the step of controlling switches includes controlling a duty cycle of the switches.

36. The method of claim 33 wherein the step of controlling switches includes monitoring a system state.

37. The method of claim 36 wherein controlling switches includes controlling a duty cycle of the switches based on the system state.

38. The method of claim 33 wherein the step of coupling the electrical circuit acts to increase oscillations of the disturbance.

39. The method of claim 33 wherein the step of coupling the electrical circuit acts to dampen oscillations of the disturbance.

40. The method of claim 33 wherein the step of coupling the transducer includes coupling a plurality of transducers to the disturbance.

41. The method of claim 33 wherein the step of coupling the transducer includes attaching the transducer to a structure.

42. A method of extracting power, comprising the steps of:

coupling a transducer that converts mechanical power to electrical power to a mechanical disturbance,

extracting power from the transducer and applying power to the transducer during different intervals in the course of the disturbance, wherein extracting power from the transducer and applying power to the transducer indludes the use of amplifier electronics, and

storing extracted power.

43. The method of claim 42 wherein the step of extracting power from the transducer and applying power to the transducer occurs in a single cycle.

44. The method of claim 42 further comprising applying extracted power to an external load.

45. The method of claim 42 wherein the step of applying power includes applying extracted power to the transducer.

46. The method of claim 42 wherein the step of extracting power from the transducer and applying power to the transducer includes the use of a resonant circuit.

47. The method of claim 42 wherein the step of coupling the transducer includes coupling a plurality of transducers to the disturbance.

48. The method of claim 42 wherein the step of coupling the transducer includes attaching the transducer to a structure.

51. The system of claim 46 wherein the amplifier electronics comprise an H-bridge.

52. The system of claim 46 wherein the amplifier electronics comprise a half bridge.

53. The system of claim 46 wherein the electrical circuit further includes control electronics for controlling the amplifier electronics.

54. The system of claim 53 wherein the control electronics control a duty cycle of the amplifier electronics.

61. The system of claim 54 wherein the amplifier electronics comprise an H-bridge.

62. The system of claim 54 wherein the amplifier electronics comprise a half bridge.

63. The system of claim 54 wherein the electrical circuit further includes control electronics for controlling the amplifier electronics.

64. The system of claim 63 wherein the control electronics control a duty cycle of the amplifier electronics.

49. The system for extracting power, comprising:

a transducer that converts mechanical power to electrical power, the transducer configured for coupling to a disturbance,

an electrical circuit connected across the transducer such that a peak voltage experienced by the transducer is greater than two times higher than any peak voltage of an open circuit transducer due to the disturbance alone, the electrical circuit including amplifier electronics, and

a storage element for storing extracted power.

50. The system of claim 49 wherein the circuit includes a resonant electrical circuit and a rectification circuit.

55. The system of claim 49 wherein the electrical circuit further includes a sensor for monitoring a system state used to control the electrical circuit.

56. The system of claim 49 wherein the storage element comprises a capacitor.

57. The system of claim 49 wherein the storage element comprises a rechargeable battery.

58. The system of claim 49 wherein the storage element comprises two components connected in series, a side of the transducer being connected to a node between the two components.

59. A system for extracting power, comprising:

a transducer that converts mechanical power to electrical power, the transducer configured for coupling to a disturbance, and

an electrical circuit connected across the transducer such that a peak of the integral of the current onto and off the transducer is greater than two times higher than any peak of an integral of a current of a short circuit transducer due to the disturbance alone, the electrical circuit including amplifier electronics, and

a storage element for storing extracted power.

60. The system of claim 59 wherein the circuit includes a resonant circuit and a rectification circuit.

65. The system of claim 59 wherein the electrical circuit further includes a sensor for monitoring a system state used to control the electrical circuit.

66. The system of claim 59 wherein the storage element comprises a capacitor.

67. The system of claim 59 wherein the storage element comprises a rechargeable battery.

68. The system of claim 59 wherein the storage element comprises two storage components connected in series, a side of the transducer being connected to a node between the two components.

69. A system for extracting power, comprising:

a transducer that converts mechanical power to electrical power, the transducer configured for coupling to a mechanical disturbance,

an electrical circuit including switching electronics connected across the transducer control logic which switch the switching electronics at a frequency greater than two times an excitation frequency of the disturbance, and

a storage element for storing extracted power, and

a sensor for measuring a system state, the operation of the controlled switching being based on the measured system rate.

70. The system of claim 69 wherein the control logic controls the duty cycle of the switching electronics.

71. The system of claim 69 wherein the switching electronics comprise an H-bridge.

72. The system of claim 69 wherein the switching electronics comprise a half bridge.

73. The system of claim 69 wherein the storage element comprises a capacitor.

74. The system of claim 69 wherein the storage element comprises a rechargeable battery.

75. The system of claim 69 wherein the storage element comprises two storage components connected in series, a side of the transducer being connected to a node between the two components.

87. The system of claim 69 wherein the switching electronics are connected across the transducer such that a peak voltage experienced by the transducer is higher than any peak voltage of an open circuit transducer due to the mechanical disturbance alone.

76. A system for extracting power, comprising:

a transducer that converts mechanical power to electrical power, the transducer configured for coupling to a disturbance,

an electrical circuit connected across the transducer and capable of extracting power from the transducer and applying power to the transducer during different intervals in the course of the disturbance, the electrical circuit including amplifier electronics, and

a storage element for storing extracted power.

77. The system of claim 76 wherein the electrical circuit is capable of extracting power from the transducer and applying power to the transducer in a single cycle.

78. The system of claim 76 wherein the circuit includes a resonant circuit and a rectification circuit.

79. The system of claim 76 wherein the amplifier electronics comprise an H-bridge.

80. The system of claim 76 wherein the amplifier electronics comprise a half bridge.

81. The system of claim 76 wherein the electrical circuit further includes control electronics for controlling the amplifier electronics.

82. The system of claim 81 wherein the control electronics control a duty cycle of the amplifier electronics.

83. The system of claim 76 wherein the electrical circuit further includes a sensor for monitoring a system state used to control the electrical circuit.

84. The system of claim 76 wherein the storage element comprises a capacitor.

85. The system of claim 76 wherein the storage element comprises a rechargeable battery.

86. The system of claim 76 wherein the storage element comprises two storage components connected in series, a side of the transducer being connected to a node between the two components.