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A Self-Supplied Power Optimizer for Piezoelectric Energy Harvesters Operating under Non-Sinusoidal Vibrations

Author

Listed:
  • Luigi Costanzo

    (Department of Engineering, Università degli Studi della Campania “Luigi Vanvitelli”, 81031 Aversa, Italy)

  • Alessandro Lo Schiavo

    (Department of Engineering, Università degli Studi della Campania “Luigi Vanvitelli”, 81031 Aversa, Italy)

  • Massimo Vitelli

    (Department of Engineering, Università degli Studi della Campania “Luigi Vanvitelli”, 81031 Aversa, Italy)

Abstract

A self-supplied circuit that is able to significantly increase the power delivered to a bridge rectifier by a Resonant Piezoelectric Vibration Energy Harvester (RPVEH) is presented and discussed. The proposed circuit, called the Energy Harvester Power Optimizer (EHPO), is implemented by means of a switch-mode converter that emulates a negative capacitance. Unlike switch-mode impedance emulators, based on sophisticated tracking algorithms requiring lossy microcontrollers, EHPO exploits a very light control circuit based on a hysteresis comparator. The EHPO is self-supplied since it does not need an external supply, but it draws the energy for its operation directly from the RPVEH. Moreover, it is developed without the assumption of purely sinusoidal vibrations. Experimental results show that the EHPO can significantly increase the power delivered to a rectifier, both in the case of sinusoidal vibrations (percent gain of the net extracted power up to about 190%) and non-sinusoidal vibrations (percent gain of the net extracted power up to about 245%), regardless of the shape of the forcing acceleration and regardless of the RPVEH resonance frequency.

Suggested Citation

  • Luigi Costanzo & Alessandro Lo Schiavo & Massimo Vitelli, 2023. "A Self-Supplied Power Optimizer for Piezoelectric Energy Harvesters Operating under Non-Sinusoidal Vibrations," Energies, MDPI, vol. 16(11), pages 1-20, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4368-:d:1157452
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    References listed on IDEAS

    as
    1. Luigi Costanzo & Massimo Vitelli, 2020. "Tuning Techniques for Piezoelectric and Electromagnetic Vibration Energy Harvesters," Energies, MDPI, vol. 13(3), pages 1-34, January.
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