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Two-Dimensional P&O MPPT Technique for Piezoelectric Vibration Energy Harvesters | IEEE Conference Publication | IEEE Xplore

Two-Dimensional P&O MPPT Technique for Piezoelectric Vibration Energy Harvesters


Abstract:

This paper is focused on resonant Piezoelectric Vibration Energy Harvesters (PVEHs). In all energy harvesting applications, and in particular in PVEH applications, the ma...Show More

Abstract:

This paper is focused on resonant Piezoelectric Vibration Energy Harvesters (PVEHs). In all energy harvesting applications, and in particular in PVEH applications, the maximization of the extracted power is mandatory. It is well known that, in order to maximize the harvested power, it is necessary to get the optimal matching between the harvesting device and the load. In particular, in PVEH applications under purely sinusoidal input vibrations, in order to maximize the harvested power, the impedance of the load must be coincident with a well-defined optimal impedance ZOPT. However, in practical applications, the load of PVEHs is not a linear impedance, but it is nearly always represented by a non-linear AC/DC converter. In this paper, the full-bridge based active AC/DC architecture, that is theoretically able to emulate just the optimal impedance ZOPT, is analyzed in detail. In particular, a Two-Dimensional Perturb and Observe (TD-P&O) algorithm is proposed and discussed for the emulation of such an optimal impedance. Simulation results confirming the validity of the proposed TD-P&O algorithm and the increase of the extracted power with respect to the simpler case of a diode bridge rectifier source/load electronic interface are presented and discussed.
Date of Conference: 02-04 July 2019
Date Added to IEEE Xplore: 04 November 2019
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ISSN Information:

Conference Location: Otranto, Italy

I. Introduction

In Wireless Sensor Nodes applications, when vibrations are available, Vibration Energy Harvesters can be used to replace batteries or at least to limit their drawbacks (expensive maintenance/replacement, insufficient or unpredictable duration of operational life, not eco-friendly disposal due to the hazardous chemical content) [1] – [3] . Most Vibration Energy Harvesters belong to one of the following three main categories: piezoelectric, electrostatic and electromagnetic. This paper is focused on resonant Piezoelectric Vibration Energy Harvesters (PVEHs) that are based on the Piezoelectric Effect. Piezoelectric Effect is the ability of some materials (notably crystals and certain ceramics) to generate a voltage when they are subject to a mechanical stress. The electrical polarization is proportional to the applied strain [4] – [5] .

References

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