A Vibration Energy Harvester of S-shaped Piezoelectric Cantilever Beam

Abstract

The invention discloses an S-shaped piezoelectric cantilever beam vibration energy collector, which includes a support and an S-shaped cantilever beam fixedly installed on the support. The S-shaped cantilever beam is composed of a base plate section, a bending section and a free section; Piezoelectric elements are installed on the surface of the substrate section and the free section to convert the energy generated by the vibration of the cantilever beam into electrical energy; a mass block is installed at the end of the free section to adjust the resonance frequency and vibration amplitude of the cantilever beam value; the stiffness of the curved segment is much greater than that of the substrate segment and the free segment. The vibration energy harvester of the present invention forms a relatively wide working frequency band through the S-type piezoelectric cantilever beam and the terminal mass block to control the first two vibration modes of the system. The device is easy to start vibration, and the energy recovery efficiency and operation stability High, can realize the conversion of environmental vibration energy.

Description

technical field [0001] The invention relates to the fields of vibration application and electric power technology, in particular to an S-shaped piezoelectric cantilever beam vibration energy harvester, which belongs to the technical field of converting mechanical energy generated in a vibration environment into electrical energy and collecting it for use by microelectronic devices. Background technique [0002] With the continuous advancement of micro-electromechanical processing technology and wireless technology, electronic devices such as embedded systems, wireless sensor networks, smart wearable devices, and various implantable micro-sensors have entered the era of miniaturization, integration, and low power consumption. However, energy supply technology has become a bottleneck restricting the further development of the above-mentioned electronic devices. Traditional chemical batteries have various defects such as large size, limited life, and need to be replaced manuall...

AI Technical Summary

Problems solved by technology

But there are also disadvantages: if the resonance frequency is lowered, the length of the cantilever must be increased, but too long cantilever is not conducive to the miniaturization of the device

In addition, most of the existing energy harvesters work at a fixed frequency, that is, the energy harvester can only work within a narrow single frequency range, while the vibration source frequency in the environment may fluctuate at any time within a certain range, or there may be If there are multiple vibration frequencies, if the resonant frequency of the energy harvester cannot match the frequency of the environmental vibration source well, the collected energy will be greatly reduced, and the overall output power will also be sharply reduced, making it difficult to ensure the reliability of microelectronic devices. normal work

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