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Modeling Piezoelectric Harvesters under Amplitude and Frequency Modulated Vibrations | IEEE Conference Publication | IEEE Xplore

Modeling Piezoelectric Harvesters under Amplitude and Frequency Modulated Vibrations


Abstract:

The prediction of the extractable power from energy harvesting devices is of utmost interest for system designers. In this paper, this issue is addressed in the case of P...Show More

Abstract:

The prediction of the extractable power from energy harvesting devices is of utmost interest for system designers. In this paper, this issue is addressed in the case of Piezoelectric Resonant Vibration Energy Harvesters (PRVEHs) driven by amplitude and frequency modulated vibrations. The widespread architecture of PRVEH systems made up of a passive rectifier cascaded by a DC/DC converter is here considered. An analytical expression of the harvested power as a function of the voltage at the output of the passive rectifier is derived for the cases of vibrations with amplitude modulation and frequency modulation. Further, an analytical-numerical formula is presented for PRVEHs fed by non-sinusoidal vibrations exhibiting envelope and frequency with slow variations. Numerical simulations confirm the theoretical results.
Date of Conference: 27-29 November 2019
Date Added to IEEE Xplore: 23 January 2020
ISBN Information:
Conference Location: Genoa, Italy

I. Introduction

An interesting alternative to batteries for feeding wireless sensor networks relies on energy harvesting systems, which are able to convert the ambient energy into electrical energy. Many types of energy harvesting sources were investigated in literature, but vibrations represent one of the most attractive, because they can be found almost anywhere in the ambient [1]–[4]. Among the different types of energy transducers, here piezoelectric cantilevers are considered, as they are widely available on the market. Thus, Piezoelectric Resonant Vibration Energy Harvesters (PRVEH s) are considered [5].

References

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