Semi-active frequency modulation vibration energy capturer

Abstract

The invention relates to a semi-active frequency modulation vibration energy capturer. The semi-active frequency modulation vibration energy capturer comprises an electromagnetic vibration energy capturing component (1), a base (2), an electronic control plate (3), a frequency adjusting component (4) and a piezoelectric cantilever beam (5), wherein the electromagnetic vibration energy capturing component (1) and the electronic control plate (3) are mounted on the base (2); the electromagnetic vibration energy capturing component (1) is in electric connection with the electronic control plate (3); the electronic control plate (3) is in electric connection with the frequency adjusting component (4); the frequency adjusting component (4) is mounted at the tail end of the piezoelectric cantilever beam (5); the head end of the piezoelectric cantilever beam (5) is fixedly connected onto the base (2); the piezoelectric cantilever beam (5) is in electric connection with the electronic control plate (3). According to the semi-active frequency modulation vibration energy capturer, the inherent frequency of the piezoelectric cantilever beam is adjusted through controlling the position of a mass block at the tail end of the piezoelectric cantilever beam by induced current generated through external excitation, so that self-adaptive and semi-active frequency modulation is performed in a wider frequency domain, so as to capture more energy, control is carried out without the need of inputting external energy, and the energy capturing efficiency is relatively high.

Description

[technical field] [0001] The invention relates to the technical field of vibration energy harvesting, in particular to a semi-active frequency modulation 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 ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a semi-automatic frequency modulation vibration energy harvester, which can capture more energy in a wider frequency domain, improve energy capture efficiency, and overcome the existing piezoelectric vibration energy capture Narrow application frequency domain and low energy harvesting efficiency

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