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A piezoelectric energy harvester

A piezoelectric energy collector technology, applied to electrical components, piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, etc., can solve the problems of insufficient utilization and reduced ability to collect energy , to achieve the effect of increasing the service life, improving the ability to collect electric energy, and improving adaptability

Active Publication Date: 2018-02-09
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this energy harvester also has certain problems
For example, this type of energy harvester can only collect high-power electric energy when it vibrates at a specific frequency (the natural vibration frequency of the energy harvester). If it deviates from this frequency, the ability of the device to collect energy will be greatly reduced. The collector cannot take full advantage of the vibrations of various frequencies present in the surrounding environment

Method used

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  • A piezoelectric energy harvester
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  • A piezoelectric energy harvester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to Figure 1a and Figure 1b , in Embodiment 1, one end of the piezoelectric vibrator 2 and the housing 5 are fixed at the vibration source 1, and the vibrating block 3 is glued to the other end of the piezoelectric vibrator 2 to improve the vibration capability of the piezoelectric vibrator. In this embodiment, the size of the rectangular piezoelectric vibrator is 8mm×20mm×0.05mm (width×length×thickness, one piece), the material is polyvinylidene fluoride (PVDF), and the size of the vibration block is 2mm×20mm×2.7 mm (width × length × height, one piece), the material is steel. One end of the piezoelectric vibrator is clamped at the fixed end and extended to form a cantilever beam, and no liquid is added inside the shell, that is, air is used as the medium inside the shell. Select the vibration acceleration as 5m / s2. Using COMSOL simulation, observe the electric potential and stress at a certain point on the surface of the piezoelectric vibrator, and calculate t...

Embodiment 2

[0037] refer to Figure 1a and Figure 1b The difference between embodiment 2 and embodiment 1 is that in embodiment 2, the size of the rectangular piezoelectric vibrator 2 is 5.5mm×48mm×0.05mm (width×length×thickness, one piece), and the vibration block 3 Platinum (Pt) is selected as the material, the size of the vibrating block (one piece) is 2mm×48mm×3.1mm, and the shell is filled with insulating liquid as the vibration medium. The liquid type is preferably silicone oil (viscosity 6cSt). The rest of the structures and connections are the same as those in Example 1. Using COMSOL simulation, observe the electric potential and stress at a certain point on the surface of the piezoelectric vibrator, and calculate the corresponding output power according to the formula, so as to draw the frequency response curves of output power and stress respectively, as shown in Figure 3a and 3b shown.

[0038] In addition, comparing the experimental results of Example 1 and Example 2, it ...

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Abstract

The invention discloses a piezoelectric energy harvester, which includes a vibration source, a piezoelectric vibrator, a vibration block and a casing, one end of the piezoelectric vibrator is fixed on the vibration source, and the vibration block is fixed on the piezoelectric vibrator. On the other end of the electric vibrator, the vibration block and the piezoelectric vibrator together form a cantilever beam structure, the housing is fixed on the vibration source and filled with vibration medium, the piezoelectric vibrator and the vibration block are located inside the housing. The energy harvester can maintain a high ability to collect electric energy at the original resonance frequency, and at the same time significantly increase the frequency response bandwidth, thereby improving the ability to collect electric energy when the resonance frequency deviates.

Description

technical field [0001] The invention relates to the technical field of energy collection, in particular to a piezoelectric energy harvester. Background technique [0002] Energy harvesting technology is a technology that converts energy that cannot be directly used in the surrounding environment into energy that can be used in a specific way. This kind of utilization is mainly to provide electric energy for small devices. Compared with traditional battery power supply, energy harvesting technology has the following advantages for MEMS power supply: simple structure, small footprint; long service life, almost no toxic or dangerous substances; long-term stable power supply without disassembly and maintenance replace. Therefore, the development of energy harvesting technology is of great significance for the development of new energy sources. [0003] Among the various forms of energy existing in the surrounding environment, vibration energy is the most common one, and has a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18
Inventor 王进宋俊东赵冠兴
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV