Piezoelectric vibrational energy harvesting systems incorporating parametric bending mode energy harvesting
First Claim
1. A vibrational energy harvester, comprising:
- a resonator beam having transverse cross-sectional flexural properties, a fundamental resonance frequency in a first bending direction that is a function of said transverse cross-sectional flexural properties and a parametric mode frequency in a second bending direction perpendicular to said first bending direction, wherein said parametric mode frequency is a function of said transverse cross-sectional flexural properties and said transverse cross-sectional flexural properties are selected to tune said fundamental resonance frequency to a first desired frequency and to tune said parametric mode frequency to a second desired frequency, said resonant beam including piezoelectric material for generating electrical energy in response to bending of said resonator beam in each of said first and second bending directions when said resonator beam is vibrating at said first desired frequency and said second desired frequency.
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Abstract
Vibrational energy harvesting (VEH) structures that include resonant beams each having a fundamental resonance frequency and a parametric mode frequency and including at least one piezoelectric layer for generating electrical charge in response to each of fundamental-resonance excitation and parametric-mode excitation of that beam. Circuitry is provided for harvesting the electrical charge from the resonant beam. In some embodiments, the parametric mode frequency of the beam is tuned to be close to its fundamental resonance frequency so as to increase the effective bandwidth of a VEH structure. The effective bandwidth of a VEH structure can be further increased by tuning ones of multiple parametric-mode-enabled resonant beams to slightly different fundamental resonance frequencies and parametric mode frequencies.
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Citations
37 Claims
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1. A vibrational energy harvester, comprising:
a resonator beam having transverse cross-sectional flexural properties, a fundamental resonance frequency in a first bending direction that is a function of said transverse cross-sectional flexural properties and a parametric mode frequency in a second bending direction perpendicular to said first bending direction, wherein said parametric mode frequency is a function of said transverse cross-sectional flexural properties and said transverse cross-sectional flexural properties are selected to tune said fundamental resonance frequency to a first desired frequency and to tune said parametric mode frequency to a second desired frequency, said resonant beam including piezoelectric material for generating electrical energy in response to bending of said resonator beam in each of said first and second bending directions when said resonator beam is vibrating at said first desired frequency and said second desired frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A vibrational energy harvester, comprising:
a group of parametric mode enabled (PME) piezoelectric vibrational energy harvesting (PVEH) beams all configured to harvest electrical charge from specific fundamental and parametric mode resonant frequencies. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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32. A vibrational energy harvester, comprising:
a plurality of differing groups of parametric mode enabled (PME) piezoelectric vibrational energy harvesting (PVEH) beams, wherein said differing groups are configured to harvest electrical charge from corresponding respective differing sets of fundamental and parametric mode resonant frequencies. - View Dependent Claims (33, 34, 35, 36, 37)
Specification