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Multi-degree-of-freedom up-conversion piezoelectric energy harvester

A technology of piezoelectric energy harvesting and degree of freedom, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, generators/motors, etc. Low-level problems, to achieve the effect of improving utilization and increasing vibration frequency

Inactive Publication Date: 2018-09-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional piezoelectric energy harvesters are mostly single cantilever beam structures, with single structure, narrow operating frequency band, and low energy utilization rate; traditional piezoelectric energy harvesters have high resonant frequency, and the vibration frequency in the environment is mostly low frequency (below 100Hz). Difficult to reach resonance and output higher energy

Method used

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  • Multi-degree-of-freedom up-conversion piezoelectric energy harvester
  • Multi-degree-of-freedom up-conversion piezoelectric energy harvester
  • Multi-degree-of-freedom up-conversion piezoelectric energy harvester

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0024] Specific implementation mode one, such as figure 1 As shown, the base beam 4 includes four vertical base beams and a horizontal base beam, the four vertical base beams are arranged around the swing device, and are vertically fixedly connected to the top of the housing 1; the horizontal base beam is arranged on the swing The bottom of the device is horizontally and fixedly connected to the wall on one side of the housing 1; it is perpendicular to the vertical base beam; when the metal ball 5 swings, it can hit the five base beams arranged around and at the bottom of the swing device .

[0025] The specific working process is: in a vibration environment, for a multi-degree-of-freedom up-conversion piezoelectric energy harvester, the shell 1 vibrates, and the vibration of the shell 1 drives the base beam 4 and the piezoelectric ceramic material 3 on it to vibrate in each degree of freedom , due to the existence of the positive piezoelectric effect, the upper and lower ele...

specific Embodiment approach 2

[0026] Embodiment 2. The difference between this embodiment and Embodiment 1 is that there are multiple vertical base beams arranged around the swing device, as long as they are evenly arranged around the swing device. Others are the same as in the first embodiment.

[0027] The invention innovates in the structure, changes the single structure of the traditional energy harvester, and makes full use of the vibration energy in the environment. In order to increase the power generation of the energy harvester, base beams are arranged in multiple degrees of freedom, which improves the utilization rate of vibration energy; at the same time, the up-conversion method is adopted to organically combine the swing of the metal ball with the vibration of the base beam, so that the metal ball Knock the base beam when swinging, increase the vibration frequency of the piezoelectric ceramic material, and make the piezoelectric ceramic material resonate with the external environment, and the ...

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Abstract

The invention discloses a multi-degree-of-freedom up-conversion piezoelectric energy harvester which comprises a housing, a swinging device, a piezoelectric ceramic material and base beams, wherein the swinging device, the piezoelectric ceramic material and the base beams are all arranged inside the housing; the swinging device comprises a spring and a metal ball; one end of the spring is fixedlyconnected with the top of the housing, and the other end is connected with the metal ball for pulling the metal ball to swing in multiple directions; the base beams comprise a plurality of vertical base beams and a horizontal base beam; the vertical base beams are arranged around the swinging device; the horizontal base beam is arranged at the bottom of the swinging device and is perpendicular tothe vertical base beams; when swinging, the metal ball can knock the plurality of base beams arranged around and at the bottom of the swinging device; and the piezoelectric ceramic material is adheredto an outer surface of each base beam. The multi-degree-of-freedom up-conversion piezoelectric energy harvester provided by the invention can improve a utilization rate of vibration energy, so that the piezoelectric ceramic material can resonate with an external environment to realize resonance while increasing an output power.

Description

technical field [0001] The invention relates to the technical field of piezoelectric energy harvesters, in particular to a multi-degree-of-freedom up-conversion piezoelectric energy harvester. Background technique [0002] Microelectronic devices are mainly powered by external power sources and chemical batteries. The external power supply circuit is complicated, requires regular maintenance, and the installation and maintenance costs are high, and it cannot be applied to passive, wireless and other environments. Chemical batteries need to be replaced regularly, have low energy density, and are easy to cause environmental pollution. Therefore, it is urgent to find a kind of green energy that saves energy and is not restricted by the environment. [0003] Vibration sources are ubiquitous in daily life. Vibration energy is a green and non-polluting energy source. Vibration energy is collected and stored, which can be used to solve the energy source problem of microelectronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18
CPCH02N2/188
Inventor 刘海鹏闫丽高世桥张广义吴君汝
Owner BEIJING INSTITUTE OF TECHNOLOGYGY