An ultra-broadband high-efficiency piezoelectric vibration energy harvesting device

Abstract

The present invention provides an ultra-wideband energy-efficient piezoelectric vibration energy harvesting device for solving the technical problem of low energy conversion efficiency when the external vibration frequency is not stable in the prior art, including brackets and an oscillating body. The oscillating body includes a low frequency oscillating body and a high frequency oscillating body.The brackets include a top bracket, a middle bracket and a bottom bracket which are sequentially stacked from top to bottom. The three brackets adopt a three-dimensional structure with a cavity penetrating the upper and lower end faces; the low frequency oscillating body comprises a low frequency reed between the middle bracket and the bottom bracket, a low frequency mass fixed to the central bearing section of the low frequency reed, and a low frequency cantilever module attached to the cantilever of the low frequency reed; the high frequency oscillating body includes a high frequency reed between the top bracket and the middle bracket, a high frequency mass fixed to the central bearing section of the high frequency reed and a high frequency cantilever module attached to the double-cantilever beam of the high frequency reed; and the low frequency mass and the high frequency reed are connected by at least three compression springs.

Description

technical field [0001] The invention belongs to the technical field of energy collection, and relates to a piezoelectric vibration energy collection device, in particular to an ultra-broadband high-energy-efficiency piezoelectric vibration energy collection device, which can be used to collect external vibration energy with unstable frequency. [0002] technical background [0003] With the rapid development and wide application of wireless sensor network technology, it is becoming more and more important to solve the energy supply problem of MEMS. At present, chemical batteries are still the main power supply method. Using traditional chemical batteries for power supply will face disadvantages such as limited battery capacity, unsustainable power supply, troublesome replacement and maintenance, and environmental pollution from waste batteries. Mechanical energy is a kind of energy that exists widely in nature. Using energy harvesters to convert unused mechanical energy into ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the existing defects of the above-mentioned technologies, and propose an ultra-broadband high-energy-efficiency piezoelectric vibration energy harvesting device, which is used to solve the technical problem of low energy conversion efficiency existing in the prior art when the external vibration frequency is unstable

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