Piezoelectric power generation device

Abstract

The invention discloses a piezoelectric power generation device. The piezoelectric power generation device comprises an outer frame, a main cantilever beam, a mass-adjustable main mass block, two second-level cantilever beams and two mass-adjustable second-level mass blocks; the main cantilever beam, the main mass block, the two second-level cantilever beams and the two mass-adjustable second-level mass blocks are respectively located at the inner side of the outer frame; one end of the main cantilever beam is connected with the outer frame; the other end of the main cantilever beam is connected with the main mass block; the main mass block is connected with one end of each of the second-level cantilever beams; the other end of each of the second-level cantilever beams is connected with one second-level mass block; and the main cantilever beam and the second-level cantilever beams are respectively a metal frame of which the upper surface and the lower surface are both provided with a piezoelectric unit. According to the piezoelectric power generation device of the invention, one main cantilever beam and two second-level cantilever beams are adopted to form a three-degrees-of-freedom piezoelectric beam structure, so that the work bandwidth of the piezoelectric generator can be broadened through the plurality of cantilever beams with different resonant frequencies; and the mass of the main mass block and the second-level mass blocks can be decreased or increased according to actual situations, and therefore, resonant frequencies can be adjusted flexibly. Thus, the piezoelectric power generation device of the invention can be applied to environments with different resonant frequencies.

Description

technical field [0001] The invention relates to the field of generating electricity by using the piezoelectric effect, in particular to a piezoelectric generating device. Background technique [0002] When some dielectrics are deformed by external forces in a certain direction, polarization will occur inside them, and at the same time, opposite charges will appear on its two opposite surfaces; when the external force is removed, it will return to its original state. In an uncharged state, this phenomenon is called the piezoelectric effect. In order to solve the energy problem of low-power electronic devices, piezoelectric generators that convert the vibration energy in the surrounding environment into electrical energy through the piezoelectric effect have been proposed. The output power of the piezoelectric generator reaches its maximum value under the condition of resonance, and when the frequency of the environmental vibration deviates from the resonance frequency of the...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing technology is difficult to effectively collect low-frequency energy and the use range is narrow, the embodiment of the present invention provides a piezoelectric power generation device

Images