Piezoelectric vibration energy collecting apparatus with resonance frequency adjustable

A piezoelectric vibration and energy harvesting technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve difficult and precise problems to maximize the energy harvesting capability and overcome the inability to precisely adjust the resonance frequency

Inactive Publication Date: 2009-02-04
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to various inherent factors such as manufacturing, operation, etc., this "tuning" is difficult to perform precisely

Method used

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  • Piezoelectric vibration energy collecting apparatus with resonance frequency adjustable
  • Piezoelectric vibration energy collecting apparatus with resonance frequency adjustable
  • Piezoelectric vibration energy collecting apparatus with resonance frequency adjustable

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Embodiment Construction

[0017] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0018] figure 2 A device according to a preferred embodiment of the invention is shown. The supporting substrate 2 and the piezoelectric layer 1 of the device are fixed on the vibrating platform 4 through the spacer 3 , and then the vibration energy is collected from the vibrating platform 4 . Spacer 3 can be metal, or other materials with greater hardness, to allow the support substrate to be bonded on the spacer, and the thickness should meet the requirements of the relative movement of support substrate 2 and vibration platform 4, so as to avoid support The substrate 2 and the vibration platform 4 collide. The piezoelectric layer 1 is fixed on opposite upper and lower sides of the support substrate 2 . The supp...

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Abstract

The invention discloses a piezoelectric vibration energy-harvesting device with adjustable resonance frequency, which belongs to the technique field of energy conversion and collection. The device adopts a supporting substrate as a vibration structure, and collects vibration energy through a piezoelectric material fixed thereon. The device combines a fixed mass block and a movable mass block, and adjusts the resonance frequency of the device simply and accurately in a rather large range, so as to keep the mechanical resonance with the ambient vibration for maximizing the vibration energy collecting capability. The energy-harvesting device can be applied to different vibration conditions in rather large frequency range, and can be combined with a sensor for making the sensor have the self-powered capability.

Description

technical field [0001] The invention relates to the technical field of energy conversion and collection, in particular to a piezoelectric vibration energy collection device with adjustable resonance frequency. Background technique [0002] In real production and life, various sensors, including wireless sensors, are being used from the environmental monitoring of buildings to the work detection of various machinery. In sensor applications, energy supply is an important part. However, in some application environments, due to the inconvenience of replacement or the limitation of space and quantity, it is impossible to use general batteries for power supply, and energy supply becomes a bottleneck in sensor applications. At the same time, many application environments have varying degrees of vibration. Therefore, miniaturized energy harvesters that convert the inherent vibration energy of the working environment into electrical energy have very promising application prospects....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18H01L41/113
Inventor 伍晓明林建辉任天令刘理天
Owner TSINGHUA UNIV
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