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Capacitance-based frequency adjustment of micro piezoelectric vibration generator.

Xinhua Mao1, Qing He2, Hong Li2

  • 1School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China ; Henan Institute of Science and Technology, Xinxiang 453003, China.

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This study introduces capacitance frequency modulation (FM) technology to tune micro piezoelectric vibration generators. This method allows continuous adjustment of the generator's natural frequency to match vibration sources, improving power supply for microelectronics.

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Area of Science:

  • Micro-energy harvesting
  • Solid-state physics
  • Materials science

Background:

  • Micro piezoelectric vibration generators are crucial for microelectronics but suffer from fixed natural frequencies.
  • Inconsistent frequencies between the generator and vibration source lead to reduced output voltage and power supply failure.
  • Current limitations hinder reliable power delivery for electronic devices.

Purpose of the Study:

  • To develop a method for adjusting the natural frequency of micro piezoelectric vibration generators.
  • To enable resonance matching between piezoelectric generators and vibration sources.
  • To enhance the power supply capability of microelectronic devices.

Main Methods:

  • Adoption of capacitance frequency modulation (FM) technology.
  • Design of different capacitance FM schemes based on adjustment layer placement.
  • Establishment of capacitance FM models for simulation.
  • Experimental validation of frequency tuning.

Main Results:

  • The natural frequency of the piezoelectric generator was successfully tuned from 46.5 Hz to 42.4 Hz.
  • A continuous adjustment range was achieved by varying bypass capacitance from 0 nF to 30 nF.
  • Capacitance FM effectively modifies the generator's natural frequency.

Conclusions:

  • Capacitance FM technology offers a viable solution for tuning piezoelectric vibration generator frequencies.
  • This method ensures resonance matching, enhancing power output for microelectronic applications.
  • Continuous frequency adjustability broadens the applicability of piezoelectric energy harvesters.