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Mechanical rectification type piezoelectric cantilever beam vibration energy collector

A technology of vibration energy collection and mechanical rectification, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve the problem of reducing circuit efficiency and reduce the process of rectification , Avoid voltage drop, high efficiency of electric energy collection

Active Publication Date: 2020-06-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These electronic rectification devices reduce the efficiency of the circuit, and this rectification power loss is more pronounced for low voltage outputs such as piezoelectric energy harvesting

Method used

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  • Mechanical rectification type piezoelectric cantilever beam vibration energy collector
  • Mechanical rectification type piezoelectric cantilever beam vibration energy collector
  • Mechanical rectification type piezoelectric cantilever beam vibration energy collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The size of each component in the mechanically rectified piezoelectric cantilever vibration energy harvester of this embodiment is shown in Table 1. The piezoelectric cantilever 3 adopts a piezoelectric bimorph, and the mass of the tip is the total mass of the mass block and the movable electrode.

[0044] Table 1

[0045]

[0046] refer to image 3 , The schematic diagram of the open-circuit voltage frequency response curve of the vibration energy harvester in this embodiment under different excitation accelerations shows that the voltage curve of 0.1 g shows a linear vibration response when the resonance frequency is 20 Hz. However, the voltage curves at 0.3g and 0.5g show a non-linear vibrational response. The mechanical current limiter limits the maximum displacement of the cantilever tip and obtains a remarkable broadband frequency response at 10V from 19 to 29Hz, especially at 0.5g, where g is the acceleration due to gravity. This shows that the contact elect...

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PUM

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Abstract

The invention discloses a mechanical rectification type piezoelectric cantilever beam vibration energy collector. The energy collector comprises a base, a fixed supporting end fixed on the base, a piezoelectric cantilever beam fixed on the fixed supporting end, a mass block attached to the tip end of the piezoelectric cantilever beam and an electrode support. An upper movable electrode and a lowermovable electrode are respectively arranged on the upper surface and the lower surface of the mass block, and are respectively connected with two leads of the piezoelectric cantilever beam; the electrode support is fixed on the base; an upper fixed electrode, a middle fixed electrode and a lower fixed electrode are arranged on the electrode support from top to bottom; the upper fixed electrode islocated above the upper movable electrode; the middle fixed electrode is located between the upper movable electrode and the lower movable electrode; the lower fixed electrode is located below the lower movable electrode; and the upper fixed electrode is connected with the lower fixed electrode. According to the invention, piezoelectric alternating current generated by vibration can be convertedinto direct current through a mechanical rectifier, and voltage drop of a traditional electronic rectifier is avoided.

Description

technical field [0001] The invention belongs to the technical field of new energy devices, and in particular relates to a mechanical rectification type piezoelectric cantilever beam vibration energy harvester and rectification and energy collection methods thereof. Background technique [0002] A piezoelectric vibration energy harvester (Piezoelectric Vibration Energy Harvester, PVEH for short) is a device that collects environmental vibration energy and generates electricity. It is suitable for sustainable self-power supply of tiny systems such as wireless sensors. A typical piezoelectric energy harvesting device is generally composed of a piezoelectric cantilever beam and a tip additional mass. Under the excitation of environmental vibration, the piezoelectric cantilever beam performs simple harmonic vibration, and this simple harmonic strain generates alternating charges. Since the load requires DC power to work, a rectifier circuit is required to convert the AC power ge...

Claims

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Application Information

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IPC IPC(8): H02N2/18
CPCH02N2/181H02N2/188
Inventor 蒋维乐王路毛琦赵立波罗国希李磊杨萍卢德江王久洪
Owner XI AN JIAOTONG UNIV
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