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

Luigi Costanzo (), Alessandro Lo Schiavo and Massimo Vitelli
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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

Energies, 2023, vol. 16, issue 11, 1-20

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.

Keywords: piezoelectric vibration energy harvesters; non-sinusoidal vibrations; power optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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