Three-dimensional piezoelectric cantilever beam vibration energy acquisition system

Abstract

The invention discloses a three-dimensional piezoelectric cantilever beam vibration energy collection system, the structure of which is: three cantilever beams are arranged on a right angle base, one is fixed horizontally on the elevation of the base; the other two are vertically fixed on the base The horizontal plane, but the working surfaces of the two cantilever beams are perpendicular to each other, the structure constitutes a bistable vibrating beam and a monostable vibrating beam. The free end of each cantilever beam is respectively provided with three permanent magnets; the upper and lower surfaces of the fixed end are respectively provided with piezoelectric sheets, and the corresponding surfaces of the three permanent magnets have the same polarity and repel each other. The device can simultaneously collect vibration energy in a three-dimensional direction, and is superior to the energy collection effect of a similar three-dimensional linear piezoelectric cantilever beam vibration energy harvester. At the same time, it can adapt to external stimuli of different strengths, and can realize the optimization of output power without adjusting system parameters. The three-dimensional piezoelectric cantilever vibration energy harvesting system is not only simple in structure, but also suitable for random excitation vibration in any direction of the environment.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation, and in particular relates to a device for collecting vibration energy and converting it into electric energy. technical background [0002] With the development of microelectronics technology and wireless technology, electronic equipment and wireless sensors have entered the era of miniaturization and low power consumption. Typically, these devices rely on batteries to provide energy, such as Ni-MH batteries, lithium polymer batteries, and the like. However, the disadvantages of battery power supply are: first, the weight and volume are relatively large, which limits the miniaturization and miniaturization of electrical components; second, the service life is limited, and frequent replacement or charging is required. In other words, it is a serious constraint. Since the energy harvester can convert the mechanical energy in the natural environment into electrical energy and s...

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Problems solved by technology

[0005] In order to overcome the defect that the conventional piezoelectric cantilever beam vibration energy harvester cannot realize energy harvesting in three-dimensional directions, the present invention proposes a structure of a three-dimensional piezoelectric cantilever beam vibration energy harvesting system, which can effectively collect energy under excitation in different directions Vibration energy, improving electromechanical energy conversion efficiency

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