Multi-frequency piezoelectric energy harvester
First Claim
1. An energy harvesting device comprising:
- a structure having a plurality of discrete resonant frequencies, said structure including;
an essentially annular housing; and
a plurality of inwardly protecting beams; and
a piezoelectric member disposed in vibration receiving relation to said structure.
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Accused Products
Abstract
A piezoelectric device connected to a vibration source converts vibration energy to electrical current. A plurality of pairs of oppositely polarized piezoelectric wafers deflect to produce an electrical current. Each pair of wafers are arranged back-to-back and electrically joined together. The plurality of pairs of wafers are each connected to a set of micro-machined parts. Each pair of wafers form a bimorph, configured as a cantilevered beam attached to a set of parts to form an element. Each cantilevered beam has a mass weighted first end and is fixedly attached to one or more flexible sheaths on a second end. A plurality of elements form a cell unit. A plurality of cell units form an array. The electrical current produced varies by the number of elements per cell unit, and/or with the number of cell units per array.
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Citations
34 Claims
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1. An energy harvesting device comprising:
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a structure having a plurality of discrete resonant frequencies, said structure including;
an essentially annular housing; and
a plurality of inwardly protecting beams; and
a piezoelectric member disposed in vibration receiving relation to said structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An energy harvesting device comprising:
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a structure having a plurality of discrete resonant frequencies, said structure including;
a central hub; and
a plurality of radially projecting beams; and
a piezoelectric member disposed in vibration receiving relation to said structure. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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10. An energy harvesting device comprising:
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an essentially annular base;
a plurality of cantilevered beams inwardly extending from said base, said plurality of beams varying in resonant frequencies; and
a piezoelectric member coupled to said plurality of beams in a vibration receiving relationship. - View Dependent Claims (11, 12, 13, 14)
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15. A device comprising:
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a substantially annular base;
a plurality of cantilevered beams inwardly extending from said base, said plurality of beams having different lengths yielding different resonant frequencies;
a piezoelectric member coupled to each beam; and
a circuit electrically connected to each piezoelectric member. - View Dependent Claims (16, 17, 18)
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26. An energy harvesting device comprising:
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a central base;
a plurality of cantilevered beams radially extending from said base, said plurality of beams varying in resonant frequencies; and
a piezoelectric member coupled to said plurality of beams in a vibration receiving relationship. - View Dependent Claims (27, 28, 29, 30)
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31. A device comprising:
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a central base;
a plurality of cantilevered beams radially extending from said base, said plurality of beams having different lengths yielding different resonant frequencies;
a piezoelectric member coupled to each beam; and
a circuit electrically connected to each piezoelectric member. - View Dependent Claims (32, 33, 34)
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Specification