A dual-mode piezoelectric vibration power generation device

Abstract

The invention discloses a dual-mode piezoelectric vibration power generation device. The dual-mode piezoelectric vibration power generation device comprises an L-shaped base, a T-type cantilever beam,a d33-mode piezoelectric crystal, a d31-mode piezoelectric sheet, an adjustable mass block, a mass press block, a substrate, shock isolation springs and four guide posts, wherein the d31-mode piezoelectric sheet is attached onto a near fixed end of a cantilever end, the adjustable mass block is connected to a part below a far fixed end of the cantilever end by a thread, one end of each of the four guide posts is in threaded connection with a bottom plate of the L-shaped base, the other ends of the four guide posts sequentially penetrates through elongate round through holes in four corners ofthe substrate, the mass press block and the adjustable mass block, and the shock isolation springs are arranged on the guide posts between the adjustable mass block and the mass press block and the guide posts between the substrate and the bottom plate of the L-shaped base. By the dual-mode piezoelectric vibration power generation device, energy collection under vertical stress in a d33 mode canbe achieved, energy collection under axial stress in the d31 mode also can be achieved, so that piezoelectric energy collection in various modes is achieved; and moreover, the dual-mode piezoelectricvibration power generation device is simple in structure, the adaptability of the device on an environment is improved, and higher power generation efficiency is achieved.

Description

technical field [0001] The invention relates to a dual-mode piezoelectric vibration power generation device, which belongs to the technical field of power generation. Background technique [0002] Due to the enhancement of human environmental protection awareness and the worry about the future energy crisis, people began to look for new energy sources. Piezoelectric vibration power generator (Piezoelectric vibration power generator, PVPG) is more and more popular in the application of energy harvesting due to its simple structure, low cost, and easy implementation. The device can collect environmental vibration energy in wireless sensor networks, It is converted into electrical energy to supply power to sensor nodes in the network, ensuring the long-term effective work of the wireless sensor network. [0003] The current PVPG based on the piezoelectric effect is mainly a thin metal cantilever piezoelectric vibrator structure in the d31 mode, which has the disadvantages of a...

AI Technical Summary

Problems solved by technology

[0005] Objective: In order to overcome the deficiencies in the technology and solve the problem of single piezoelectric energy harvesting mode and narrow working frequency band in the prior art, this paper provides a dual-mode piezoelectric vibration power generation device, which can realize multiple modes of piezoelectric energy harvesting , improve the adaptability of the device to the environment, and achieve higher power generation efficiency

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