Multi-frequency piezoelectric energy harvester

An energy harvesting device comprising:

• 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.

An energy harvesting device comprising:

• 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.

A device comprising:

• 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.

An energy harvesting device comprising:

• 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.

A device comprising:

• 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.