Vibration powered battery-assisted passive RFID tag

  • Authors:

  • Elaine Lai;Andrew Redfern;Paul Wright

  • Affiliations:

  • Department of Mechanical Engineering, University of California Berkeley, Berkeley, CA;Department of Mechanical Engineering, University of California Berkeley, Berkeley, CA;Department of Mechanical Engineering, University of California Berkeley, Berkeley, CA

  • Venue:
  • EUC'05 Proceedings of the 2005 international conference on Embedded and Ubiquitous Computing
  • Year:
  • 2005

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Abstract

Real-time supply chain management, theft prevention, and environmental monitoring motivate the need for RFID systems. Battery-assisted RFID tags increase read range and reliability; however, batteries offer only a finite lifetime solution. Hence, an experiment in powering a battery-assisted passive RFID tag using ambient vibration energy was conducted. A piezoelectric power generator was designed at a resonant frequency of 52 Hertz, with potential power output of 500 μW. Manipulation of the electric signal from the generator through a power circuit produced 8mW pulses to the tag, resulting in successful communication with the reader. Power needs were compared to an earlier experiment in powering a Mica2Dot “Mote” showing a 88% decrease in necessary power supply and 90% decrease in charge time.