Electrical power extraction from mechanical disturbances

• US 6,995,496 B1
• Filed: 06/01/2000
• Issued: 02/07/2006
• Est. Priority Date: 06/01/1999
• Status: Expired due to Term

• Current Assignee: Polatis Photonics, Inc.
• Original Assignee: Continuum Photonics, Inc. (Huber + Suhner Polatis, Inc.)
• Inventors: Hagood, Nesbitt W. IV, Leehey, Jonathan R., Bent, Aaron A., Ghandi, Kaymar
• Primary Examiner(s): Dougherty, Thomas M.
• Application Number:
  US09/584,881
• Time in Patent Office: 2,077 Days
• Field of Search: 310/316.03, 310/319, 310/338, 310/339, 310/317, 310/316.01, 310/316.02, 310/318, 331/108.C, 331/116.R, 331/158
• US Class Current: 310/317
• 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 for at least partially suppressing a vibration of a mechanical disturbance, comprising:

measuring a characteristic of the disturbance using a sensor; and

based on the measured characteristic, actuating at least one active switch of an electrical circuit to cause an electromechanical transducer coupled to the disturbance by a mechanical amplifier to act on the disturbance to at least partially suppress the vibration.

2. The method of claim 1, wherein the transducer at least approximately matches a phase of the disturbance to at least partially suppress the vibration.

3. The method of claim 1, wherein the transducer at least approximately matches a motion of the disturbance to at least partially suppress the vibration.

4. The method of claim 1, wherein the measured characteristic is selected from the group consisting of:

vibration amplitude, vibration frequency, vibration mode, physical strain, position, displacement, pressure, voltage, current, temperature, humidity, altitude, force, orientation, acceleration, motion, a physically measurable quantity corresponding to a mechanical or electrical property, a rate of change of a subset thereof, and a combination thereof.

5. The method of claim 1, wherein the sensor is selected from the group consisting of:

strain gauge, pressure sensor, PVDF film, accelerometer, active fiber composite sensor, composite sensor, and a combination thereof.

6. The method of claim 1, including using the transducer to convert at least a portion of mechanical energy of the disturbance to electrical energy, and applying at least a portion of the electrical energy to the transducer.

7. The method of claim 1, including using the transducer to convert at least a portion of mechanical energy of the disturbance to electrical energy, and applying at least a portion of the electrical energy to the electrical circuit.

8. The method of claim 1, including using the transducer to convert at least a portion of mechanical energy of the disturbance to electrical energy, and applying at least a portion of the electrical energy to the sensor.

35. The method of claim 1, wherein all electrical energy supplied to at least one of the transducers, the electrical circuit, and the sensor is derived solely from a subset of energy extracted from the mechanical disturbance.

9. A system for at least partially suppressing a vibration of a mechanical disturbance, comprising:

an electromechanical transducer coupled to the disturbance by a mechanical amplifier and configured for exchanging mechanical energy with the disturbance;

a sensor for measuring a characteristic of the disturbance; and

an electrical circuit in communication with the sensor and coupled to the transducer for causing the transducer to act on the disturbance to at least partially suppress the vibration, based on the measured characteristic, wherein the electrical circuit includes at least one active switch.

10. The system of claim 9, wherein the transducer at least approximately matches a phase of the disturbance to at least partially suppress the vibration.

11. The system of claim 9, wherein the transducer at least approximately matches a motion of the disturbance to at least partially suppress the vibration.

12. The system of claim 9, wherein the transducer is selected from the group consisting of:

piezoelectric transducer, antiferroelectric transducer, electrorestrictive transducer, peizomagnetic transducer, magnetostrictive transducer, magnetic shape memory transducer, and a combination thereof.

13. The system of claim 9, wherein the sensor is selected from the group consisting of:

strain gauge, pressure sensor, PVDF film, accelerometer, composite sensor, and a combination thereof.

14. The system of claim 9, wherein the transducer is coupled to the disturbance by a hydraulic amplifier.

15. The system of claim 9, wherein at least one of the at least one active switch is selected from the group consisting of:

MOSFET, bipolar transistor, ZGBT, SCR, and a combination thereof.

16. The system of claim 9, wherein at least one of the at least one active switch includes a diode.

17. The system of claim 9, wherein the electrical circuit includes a resonant circuit to at least approximately match a characteristic of the vibration.

18. The system of claim 17, wherein the resonant circuit is coupled to the transducer to at least approximately match a behavior of the transducer.

19. The system of claim 17, wherein the resonant circuit includes at least one capacitor.

20. The system of claim 17, wherein the resonant circuit includes at least one inductor.

21. The system of claim 9, wherein the electrical circuit includes a control circuit for controlling at least one of the at least one active switch.

22. The system of claim 21, wherein the controlling employs a method selected from the group consisting of:

rate feedback, positive position feedback, position-integral-derivative feedback (PID), linear quadratic Gaussian (LQG) control, model-based control, a dynamic compensator-based control, and a combination thereof.

23. The system of claim 21, wherein the controlling includes adjusting a duty cycle of the at least one of the at least one active switch, to configure the transducer for at least approximately matching a behavior of the disturbance.

24. The system of claim 23, wherein the behavior of the disturbance includes a frequency of the vibration.

25. The system of claim 23, wherein the behavior of the disturbance includes a phase of the vibration.

26. The system of claim 9, wherein electrical energy supplied to the transducer is derived at least in part from a subset of energy extracted from the mechanical disturbance.

27. The system of claim 9, wherein the electrical circuit includes an amplifier circuit coupled to the transducer for providing energy exchange between the electrical circuit and the transducer.

28. The system of claim 27, wherein the amplifier circuit is selected from the group consisting of:

a switching amplifier, a switched capacitor amplifier, a capacitive charge pump, an H-bridge amplifier, a half-bridge amplifier, and a combination thereof.

29. The system of claim 27, wherein the electrical circuit includes a control circuit for controlling the amplifier circuit.

30. The system of claim 29, wherein the controlling employs a method selected from the group consisting of:

rate feedback, positive position feedback, position-integral-derivative feedback (PID), linear quadratic Gaussian (LQG) control, model-based control, a dynamic compensator-based control, and a combination thereof.

31. The system of claim 29, wherein controlling the amplifier circuit includes adjusting a duty cycle of at least a portion of the amplifier circuit, to configure the amplifier circuit for at least approximately matching a behavior of the disturbance.

32. The system of claim 9, wherein the electrical circuit includes a rectifier circuit.

33. The system of claim 32, wherein the rectifier circuit is coupled to the transducer.

36. The system of claim 9, wherein all electrical energy supplied to at least one of the transducer, the electrical circuit, and the sensor is derived at least in part from a subset of energy extracted from the mechanical disturbance.

37. The system of claim 36, wherein all electrical energy supplied to at least one of the transducer, the electrical circuit, and the sensor is derived solely from a subset of energy extracted from the mechanical disturbance.

38. The system of claim 9, wherein the measured characteristic is selected from the group consisting of:

vibration amplitude, vibration frequency, vibration mode, physical strain, position, displacement, pressure, voltage, current, temperature, humidity, altitude, force, orientation, acceleration, motion, a physically measurable quantity corresponding to a mechanical or electrical property, a combination thereof, and a rate of change of the combination thereof.

34. A system for at least partially suppressing a vibration of a mechanical disturbance, comprising:

an electromechanical transducer coupled to the disturbance by a mechanical amplifier and configured for converting at least a portion of mechanical energy associated with the disturbance to electrical energy;

an electrical circuit coupled to the transducer to process at least a portion of the electrical energy, wherein the electrical circuit includes at least one active switch; and

dissipating at least a portion of the processed electrical energy, thereby at least partially suppressing a vibration of the disturbance by reducing the mechanical energy associated with the disturbance.