Composite three-stable-state piezoelectric vibration energy collector

Abstract

The invention discloses a composite three-steady-state piezoelectric vibration energy collector, which comprises a base, a first three-steady-state piezoelectric energy collector and a second three-steady-state piezoelectric energy collector, and the first three-stable piezoelectric energy collector and the second three-stable piezoelectric energy collector are arranged in the base. A first piezoelectric cantilever beam and a second piezoelectric cantilever beam are installed and fixed in parallel, and a third piezoelectric cantilever beam is connected with the first piezoelectric cantilever beam and the second piezoelectric cantilever beam in series to form the composite three-stable piezoelectric vibration energy collector. And the resonant frequencies of the first piezoelectric cantilever beam and the second piezoelectric cantilever beam and the resonant frequency of the third piezoelectric cantilever beam are connected in series to form a broadband window. According to the composite three-stable-state piezoelectric vibration energy collector, the first three-stable piezoelectric energy collector and the second three-stable piezoelectric energy collector are connected in seriesto form a composite three-stable energy collection structure, so that the composite three-stable piezoelectric vibration energy collector disclosed by the invention has the characteristics of high energy collection output capability and wide working frequency band.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to a composite tristable piezoelectric vibration energy harvester. Background technique [0002] Piezoelectric vibration energy harvesters can collect vibration energy in the environment and convert it into electrical energy to supply power for wireless sensor network nodes. Recently, tristable piezoelectric vibration energy harvesters have been shown to have wider potential energy well width and shallower potential energy well depth, which can effectively improve energy harvesting efficiency and operating frequency band. [0003] However, the currently developed tristable piezoelectric vibration energy harvesters are all single-degree-of-freedom systems, usually consisting of a piezoelectric cantilever beam with a magnet at the end and two external magnets. The output performance of the single-degree-of-freedom tri-stable piezoelectric vibration energy harvester is still ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a composite tristable piezoelectric vibration energy harvester to solve the problem that the output performance of the existing tristable piezoelectric vibration energy harvester is heavily dependent on the vibration intensity in the external environment, resulting in low energy harvesting output capability The problem

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