Mechanoelectrical Energy Research Articles

Active rectifier circuits with sequential charging of storage capacitors (SCSC) for energy harvesting in autonomous sensors

In this paper, different configurations of self-powered active rectifier circuits for energy harvesting in autonomous sensors are proposed. The circuits perform the conversion of the AC voltage provided by the mechano-electrical energy converter, and store the energy into multiple capacitors. The proposed Sequential Charging of Storage Capacitors (SCSC) technique has been developed to improve the energy extracted from converters with non-deterministic output voltage over a limited duration. Experimental results show that SCSC active rectifier circuits allow an increase of up to 147% of the stored energy versus passive rectifiers at same mechanical input.

Disc-shaped ionic polymer metal composites for use in mechano-electrical applications

Previously, mechano-electrical energy harvesting from IPMC has been studied in theconventional bender configuration. However, for mechano-electrical energy harvesting fromuncontrolled or multi-directional vibration, there is a need to produce 2D and/or 3DIPMCs. In addition, the conventional bender configuration of IPMC may impose restrictionon its application as an energy harvester. For these reasons, there is a need to advance thegeometry of the IPMC. In this paper, a new configuration, a disc-type IPMC, isintroduced. The disc IPMC was manufactured by hot pressing Nafion pellets. Thevoltage across the disc on deformation was extracted using two-electrode systems.

Modeling, Fabrication and Performance Measurements of a Piezoelectric Energy Converter for Power Harvesting in Autonomous Microsystems

This paper deals with the energy conversion via the piezoelectric effect. A mechanoelectrical energy converter based on piezoelectric thick films of lead zirconate titanate (PZT) deposited on a steel cantilever by a low-temperature process is presented. Modeling and measurement results on the performances of the piezoelectric converter are reported, and its potential use in self-powered autonomous sensor devices is proposed

Decharges partielles dans les generateurs piezoelectriques de a haute tension soumis à la compression lente

The mechanoelectrical energy conversion in a piezoelectric element is achieved differently depending on the stress to be applied. After a brief summarize of the mechanoelectrical conversion, the analysis of the slow compression is done. The remaining electric field in the piezoelement yielded the establishment of its theoretical expression on the basis of simplifying assumptions and the experimental validation. Then a new definition of the value of the electrical energy provided in the spark generation on a compressive-decompressive cycle is given and the interelectrode distance is optimized

Stabilisation sous choc des caracteristiques des ceramiques piezoelectriques par double substitution multivalente

Piezoelectrical and energetical characteristics of ABO 3-type doped lead zirconotitanate ceramics have been investigated in order to study the mechanoelectrical energy conversion under uniaxial stresses and aging during repeated experiments. A new solution in compensating the materials has been proposed owing substitutions on the B-site by the Bismuth-Antimony Bi 3+ Bi 4+ Bi 5+ Sb 3+ Sb 4+ Sb 5+ couple. The experimental results in full agreement with the theoretical interpretation of the compensating process confirm the interest of these multivalent substitutions.

Mechanoelectrical energy conversion by the water-nitrobenzene interface

Mechanoelectrical energy conversion by the water-nitrobenzene interface