Combined type broadband vibration energy collector

Abstract

The invention discloses a combined type broadband vibration energy collector. The combined type broadband vibration energy collector comprises a shell, a piezoelectric beam, two mass blocks, two coils and two magnets, wherein the piezoelectric beam, the mass blocks, the coils and the magnets are arranged in the shell; one end of the piezoelectric beam is horizontally fixed to the inner wall of the shell, and the other end of the piezoelectric beam is a free end; the two mass blocks are fixed to the upper surface and the lower surface of the free end of the piezoelectric beam respectively; the two coils are fixed to the two mass blocks respectively, and the axes of the coils are perpendicular to the upper surface and the lower surface of the piezoelectric beam; the two magnets are fixed to the inner wall of the shell, like poles are opposite, the magnets and the coils are coaxial, and a gap exists between each magnet and the corresponding coil. The combined type broadband vibration energy collector combines a piezoelectric type vibration energy collector with an electromagnetic type vibration energy collector, energy collection efficiency is improved, the magnets serve as stators installed on the shell, and the reliability of the combined type broadband vibration energy collector is improved; meanwhile, the amplitude of the coils is limited by the magnets, so that the broadband of a frequency band is expanded.

Description

technical field [0001] The invention relates to a vibration energy harvester, in particular to a broadband vibration energy harvester combining piezoelectric effect and electromagnetic effect. Background technique [0002] The vibration energy harvester can convert the vibration energy in the environment into electrical energy. It has the advantages of small size, high energy density, maintenance-free, green and environmental protection. It is not limited by the capacity of traditional chemical batteries and can realize unattended long-term power supply. , has a wide range of application requirements in environmental monitoring, building safety monitoring and other related fields. [0003] According to the energy conversion method, vibration energy harvesters can be divided into three types: piezoelectric, electromagnetic and electrostatic. The piezoelectric vibration energy harvester converts the vibration energy into the strain energy of the piezoelectric material, and th...

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Problems solved by technology

In order to expand the frequency bandwidth of the vibration energy harvester, Qin Lifeng from Xiamen University formed an array of cantilevers with different resonant frequencies (application number: 201310686868.7), which expanded the frequency bandwidth, but only one cantilever unit works, and the overall power density of the device is low.

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