A Mechanically Rectified Piezoelectric Cantilever Vibration Energy Harvester

A vibration energy harvesting and mechanical rectification technology, applied in generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc., can solve problems such as reducing circuit efficiency and avoid voltage drop problems , Prevent the vibration amplitude from being too large, and achieve the effect of high-voltage electric power output

Active Publication Date: 2021-08-13
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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  • A Mechanically Rectified Piezoelectric Cantilever Vibration Energy Harvester
  • A Mechanically Rectified Piezoelectric Cantilever Vibration Energy Harvester
  • A Mechanically Rectified Piezoelectric Cantilever Vibration Energy Harvester

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 includes a base, a fixed support end fixed to the base, a piezoelectric cantilever beam fixed to the fixed support end, and a piezoelectric cantilever attached to the tip of the piezoelectric cantilever beam. The mass block and the electrode bracket, the upper and lower surfaces of the mass block are respectively provided with an upper movable electrode and a lower movable electrode, and the upper movable electrode and the lower movable electrode are respectively connected to the two lead wires of the piezoelectric cantilever beam; the electrode bracket is fixed on the base, and the electrode bracket The upper fixed electrode, the middle fixed electrode and the lower fixed electrode are arranged from top to bottom, the upper fixed electrode is located above the upper movable electrode, the middle fixed electrode is located between the upper movable electrode and the lower movable electrode, and the lower fixed electrode is located on the lower movable electrode. Below, the upper fixed electrode is connected to the lower fixed electrode. The invention can convert piezoelectric alternating current generated by vibration into direct current through a mechanical rectifier, avoiding the voltage drop of a traditional electronic rectifier.

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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Patent Type & Authority Patents(China)
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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