Analysis of the energy harvesting performance of a piezoelectric bender outside its resonance

Abstract

International audienceWhen the frequency of the source of vibration of a Piezolectric Generator is significantly different from its eigenfrequency, the dielectric power losses become prominent and decrease the amount of power which is practically harvested. For off-resonance vibrating frequencies, the optimal operating conditions can be obtained with a Maximum Power Point Tracking method. This paper introduces complex phasors in the study of power conversion for piezoelectric generators. These complex phasors are used to describe three strategies which help simplify the tracking of the optimal generator output power for vibration frequencies which are away from resonance. Experimental results obtained on a prototype illustrate and confirm the approach with the phasor approaches illustrate and confirm the success of the proposed optimal power tracking strategies. Finally, we show that the efficiency results of each strategy depend on whether they are used inside or outside a frequency bandwidth around the eigenfrequency, and that the length of this bandwidth depends on the excitation amplitude

Development and characterisation of a self-powered measurement buoy prototype by means of piezoelectric energy harvester for monitoring activities in a marine environment

“…The mechanical behavior of the analyzed PEH (i.e. a clamped-free beam with a proof mass) can be explained by a single degree of freedom (SDOF) model (Figure 3), according to [30]- [32].…”

Segmented impact-type piezoelectric energy harvester for self-start impedance matching circuit

“…Energy harvesters (EHs) have been actively researched to power small electronics and wireless sensor nodes (WSNs) [1][2][3][4][5][6][7][8]. A micro wind EH is a type of piezoelectric energy harvester (PEH) that converts wind energy to electrical energy using a compact windmill and piezoelectric material [9][10][11].…”

Feasibility study of impact-based piezoelectric road energy harvester for wireless sensor networks in smart highways

“…Energy harvesting technologies for different types of applications have been studied for years such as the wind [1], railway [2][3], human movement [4], car tire [5], pavement [6][7][8][9] and so on [10][11][12][13][14][15][16][17][18]. The energy harvesting technology related to roads including bridge has been particularly spotlighted because of its advantages such as applicability and high input energy [19][20][21][22].…”