Research On Vibrational Energy Harvesting With Piezoelectric Structure

In recent years, with the great development of science and technology, there have kinds of energy acquisitions that can change other kinds of energy in the environment into energy. Vibration energy can be found everywhere, collecting the vibration energy around and changing it into available energy has become a hot research about a variety of portable power generation devices will become a new hotspot in the field of engineering research. As the advantages of piezoelectric materials, the energy acquisitions based on the piezoelectric materials have great prospect.In this paper, we can obtain piezoelectric energy harvesting theoretical based on the piezoelectric effect by studying the piezoelectric effect and the piezoelectric equations, and study the theoretical properties about the piezoelectric cantilever structure, then use ANSYS to analysis the influence that the structure size of the piezoelectric vibrator, material properties, thickness ratio and other factors affect on power performance of piezoelectric cantilever structure to get the right size of the piezoelectric structure.For the purpose of improving the efficiency of energy acquisition, a improved energy collection circuit is designed in this paper, and do the simulation about the classical energy acquisition circuit and the designed energy collection circuit with the ORCAD / PSPICE to get the energy collection efficiency of different circuit. Compared with the classical circuit, the output power of the designed circuit becomes much greater.In the last part of this paper, bimorph piezoelectric vibrator is made based on the ANSYS results, piezoelectric material and substrate materials. And then design the PCB board according to the diagram of energy acquisition circuit, build the experimental platform to do experiments about the classical circuit and the designed circuit, and compare the collection efficiency of the two circuits. It can get that the experimental results are similar with the simulation results, the output power of the designed circuit is greater than the output power of the classical circuit.