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A low-frequency flexible energy harvester and self-powered motion counter

An energy harvester and self-powered technology, applied in the field of micromechanical sensing, can solve the problems of low frequency power generation efficiency and unstable power supply of wearable energy harvesters, and achieve the effect of solving the loss of initial data and accurate counting results.

Active Publication Date: 2020-03-24
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a low-frequency flexible energy harvester and a self-powered motion counter, which are used to solve the problems of low-frequency power generation and unstable power supply of existing wearable energy harvesters

Method used

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  • A low-frequency flexible energy harvester and self-powered motion counter
  • A low-frequency flexible energy harvester and self-powered motion counter
  • A low-frequency flexible energy harvester and self-powered motion counter

Examples

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Effect test

Embodiment 1

[0057] Such as figure 1 As shown, this embodiment provides a low-frequency flexible energy harvester, and the low-frequency flexible energy harvester 100 includes:

[0058] flexible substrate 10;

[0059] a support block 20, the support block 20 is located on the flexible substrate 10;

[0060] A cantilever beam 30, the first end of the cantilever beam 30 is fixed on the support block 20, and the second end of the cantilever beam 30 is a free end;

[0061] A piezoelectric thin film 40, the piezoelectric thin film 40 is located on the upper surface of the cantilever beam 30; and

[0062] A permanent magnet 50, the permanent magnet 50 is located on the flexible substrate 10 below the free end of the cantilever beam 30;

[0063] Wherein, a preset distance L is set between the free end of the cantilever beam 30 and the permanent magnet 50 .

[0064] As an example, such as figure 1 Said, the low-frequency energy harvester 100 further includes a support block 20 located between...

Embodiment 2

[0076] Such as Figure 5 As shown, this embodiment provides a low-frequency flexible energy harvester, and the low-frequency flexible energy harvester 100 includes:

[0077] flexible substrate 10;

[0078] a support block 20, the support block 20 is located on the flexible substrate 10;

[0079] A cantilever beam 30, the first end of the cantilever beam 30 is fixed on the support block 20, and the second end of the cantilever beam 30 is a free end;

[0080] a piezoelectric film 40, the piezoelectric film 40 is located on the upper surface of the cantilever beam 30; and

[0081] A first permanent magnet 51 and a second permanent magnet 52, the first permanent magnet 51 and the second permanent magnet 52 are respectively located on the flexible substrate 10 below the two corners of the free end of the cantilever beam 30;

[0082] Wherein, a first preset distance is set between the first permanent magnet 51 and the second permanent magnet 52, and the free end of the cantilever...

Embodiment 3

[0095] Such as Image 6 As shown, the present embodiment provides a self-powered motion counter comprising:

[0096] The low-frequency flexible energy harvester 100 as described in Embodiment 1 or Embodiment 2 is used as the power supply terminal of the self-powered motion counter, and generates and outputs counting signals based on body movements;

[0097] The adder 200 is connected with the low-frequency flexible energy harvester 100, and is used for receiving the counting signal sent by the low-frequency flexible energy harvester 100, and reading the existing counting information stored in the memory, and based on the existing step number information performing accumulative processing on said counting signal to realize self-powered motion counting;

[0098] A memory, connected to the adder, for storing the accumulation result output by the adder.

[0099] Since the deformation of the flexible substrate in the horizontal direction does not affect the resonant power generat...

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Abstract

The invention provides a low-frequency flexible energy harvester and a self-energized motion counter. The low-frequency flexible energy harvester comprises a flexible substrate, support blocks locatedon the flexible substrate, a cantilever beam, a piezoelectric film and a permanent magnet, wherein a first end of the cantilever beam is fixed on one support block, and a second end of the cantileverbeam is a free end; the piezoelectric film is located on the upper surface of the cantilever beam; the permanent magnet is located on the flexible substrate below the free end of the cantilever beam;a preset space is formed between the free end of the cantilever beam and the permanent magnet. By means of the provided low-frequency flexible energy harvester and the self-energized motion counter,the problem that existing wearable energy harvesters have low power generation efficiency and unstable power supply under the condition of low-frequency motion is solved.

Description

technical field [0001] The invention belongs to the field of micro-mechanical sensing, in particular to a low-frequency flexible energy harvester and a self-powered motion counter. Background technique [0002] Wearable devices are in great demand in various microsystem applications such as health care, medical rehabilitation, sports training, and individual equipment, while traditional wearable devices are mainly powered by batteries, which results in limited working time of wearable devices , and battery replacement and battery charging are extremely inconvenient, and cannot meet the "plug and play" requirements. To address this issue, self-powered wearable energy harvesters have received increasing attention. [0003] Recently, researchers have developed a wearable energy harvester based on triboelectric generation, which induces free electrons to generate electricity through friction between dielectric materials and electrodes during body movement. However, since the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/18
CPCH02N2/188
Inventor 李昕欣李柯利何启盛
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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