Multi-frequency coupled vibration energy capturer

Abstract

The invention relates to a multi-frequency coupled vibration energy capturer comprising multiple piezoelectric cantilever beams (1), a base frame (3), and an electric control plate (4). The piezoelectric cantilever beams (1) are installed on the base frame (3). Permanent magnets (2) are disposed on the piezoelectric cantilever beams (1). The multiple piezoelectric cantilever beams (1) have same length and different thicknesses. The permanent magnets (2) are arranged on the same positions of the multiple piezoelectric cantilever beams (1). The multiple piezoelectric cantilever beams (1) are connected with the electric control plate (4) through a line. Each piezoelectric cantilever beam (1) is composed of a metallic sheet (5), a piezoelectric patch (6), and a silver electrode surface (7). Compared with a product in the prior art, the multi-frequency coupled vibration energy capturer is novel and simple in structure and uses the magnetic coupling of the multiple piezoelectric cantilever beams with different inherent frequencies. When being seriously deformed, any piezoelectric cantilever beam forces other piezoelectric cantilever beams to deform. Thus, more energy can be captured in a wider frequency domain and high energy capture efficiency is achieved.

Description

[technical field] [0001] The invention relates to the technical field of vibration energy harvesting, in particular to a multi-frequency coupling vibration energy harvester. [Background technique] [0002] With the development of microelectronics technology, the work of microelectronic devices requires less energy, which makes it possible to capture the energy in the natural environment to power microelectronic devices. Capturing the energy in the natural environment to power microelectronic devices not only saves energy, but also makes it more convenient and reliable not to rely on external power sources, especially in some working environments where external power supply or battery replacement is inconvenient. Mechanical vibrations are the most common energy that can be captured. At present, the vibration energy capture technology is mainly divided into three types: (1) the electromagnetic type that uses the electromagnetic energy conversion device to convert the vibratio...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a multi-frequency coupling vibration energy harvester, which overcomes the problems of narrow application frequency domain and low energy capture efficiency of the existing piezoelectric vibration energy harvester, and realizes the application in a wider range. More energy can be captured in the frequency domain, and the energy capture efficiency is higher

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