Avaliação experimental de sistema de colheita de energia através de transdutores piezelétricos

Abstract

This project aims to study a form of clean and renewable energy generation using the concept of energy harvesting, that is, the process of extracting energy from the surroundings and converting it into electrical energy, in order to replace or increase the autonomy of batteries. Vibration is one of the abundant forms in the environment and its conversion to electrical energy has been widely studied, mainly with the use of piezoelectric transducers. The current challenge in this area is to develop electronic circuits that can extract the maximum power generated by the piezoelectric and harness it to power low-consumption devices. Before that, the present work proposes the construction and experimental evaluation of electronic circuits for the use of energy via piezoelectric transduction. Some extraction circuits were designed based on capacitive filter sizing calculations and maximum power transfer. The extracted results refer to the electrical voltage, power and energy stored as a function of time. The best results in terms of power and accumulated energy were 262.144 μW and 0.223 mJ, obtained under an excitation frequency of 3 Hz. At the end, it is concluded that the feasibility of using simple energy harvesting electronic circuits in intermittent and low power systems, where the command switches between standby mode and task completion.