arXiv subjects

A. Badel

Publications and source records attributed to A. Badel.

3 recordsLinked to original sources

arXiv2019

Modelling and design of highly coupled piezoelectric energy harvesters for broadband applications

This paper reports a method to design highly coupled piezoelectric energy harvesters with frequency tuning capabilities using nonlinear electrical techniques. A cantilever beam with two PMN-PT patches has been optimized thanks to both analytical modelling and Finite Element Methods (FEM). The built prototype exhibits a strong electromechanical coupling (k${}^2$=17.6%) and a figure of merit (km${}^2$Q=12.4) which allow a bandwidth corresponding to 22% of the resonant frequency value.

physics.app-ph↗

arXiv2018

A unified N-SECE strategy for highly coupled piezoelectric energy scavengers

This paper proposes a novel vibration energy harvesting strategy based on an extension of the Synchronous Electric Charge Extraction (SECE) approach, enabling both the maximization of the harvested power and a consequent bandwidth enlargement in the case of highly coupled/lightly damped piezoelectric energy harvesters. The proposed strategy relies on the tuning of the frequency of the energy extraction events, which is either N times greater than the vibration frequency (Multiple SECE case, N > 1) or 1/N times smaller (Regenerative SECE, N < 1). We first prove analytically than increasing or decreasing N both lead to a damping reduction. While N has no impact on the system's resonance frequency in the Regenerative case (N < 1), we show that this resonant frequency becomes a function of N in the Multiple SECE case (N > 1). Experimental results on a highly coupled/lowly damped piezoelectric harvester (k^2= 0.44, Q_m = 20) demonstrates the potential of this strategy, leading to 257% harvested power improvement compared to SECE (N = 1). and the possibility to tune the resonant frequency on a range as large as 35% of the short-circuit resonant frequency of the harvester.

physics.app-ph↗

arXiv2007

Optimization of Piezoelectric Electrical Generators Powered by Random Vibrations

This paper compares the performances of a vibrationpowered electrical generators using PZT piezoelectric ceramic associated to two different power conditioning circuits. A new approach of the piezoelectric power conversion based on a nonlinear voltage processing is presented and implemented with a particular power conditioning circuit topology. Theoretical predictions and experimental results show that the nonlinear processing technique may increase the power harvested by a factor up to 4 compared to the Standard optimization technique. Properties of this new technique are analyzed in particular in the case of broadband, random vibrations, and compared to those of the Standard interface.

cs.OH↗