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Energy harvesting for wireless sensor operation and data transmission

  • US 7,429,805 B2
  • Filed: 12/24/2004
  • Issued: 09/30/2008
  • Est. Priority Date: 03/07/2002
  • Status: Expired due to Term
First Claim
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1. An energy harvesting system, comprising:

  • a wheel;

    an energy harvesting circuit including a piezoelectric material, said energy harvesting circuit mounted on said wheel, wherein said energy harvesting circuit includes a reactive device having an impedance for storing energy derived from said piezoelectric material, wherein said impedance approximately matches impedance of said piezoelectric material, wherein said energy harvesting circuit further includes a low impedance high capacity storage device having a lower impedance and a higher capacity than said reactive device, wherein said low impedance high capacity storage device is switchably connected to receive charge from said reactive device; and

    an energy using circuit connected to receive power derived from said energy harvesting circuit, said energy using circuit including a sensor and a transmitter, said transmitter for wirelessly transmitting sensor information.

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