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Self-powered wireless switch

  • US 6,933,655 B2
  • Filed: 04/14/2003
  • Issued: 08/23/2005
  • Est. Priority Date: 10/13/2000
  • Status: Expired due to Fees
First Claim
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1. A vehicle system comprising:

  • a keyless entry pad on an exterior of a vehicle; and

    a plurality of self-powered wireless switches connected to the keyless entry pad and actuated when a user presses the pad wherein each switch includes a wireless transmitter and an energy harvesting device arranged to produce electrical power for operation of the wireless transmitter upon actuation of the switch by the user, wherein the energy harvesting device includes a piezoelectric element arranged to be distressed upon actuation of the switch, and wherein each switch further includes an electric circuit including a matching wound step down transformer coupling the piezoelectric element to a rectifier connected to a capacitor to allow the piezoelectric element to resonate and the capacitor to receive the harvested energy and supply electrical power for operation of the wireless transmitter.

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