Magnetic coupling multi-beam piezoelectric energy capture device and bistable realization method thereof

Abstract

The invention discloses a magnetic coupling multi-beam piezoelectric energy capture device and a bistable realization method thereof. Under the external fundamental excitation, multiple beams can be driven to generate nonlinear vibration, and multi-beam composite piezoelectric power generation is completed. The device comprises an L-shaped cantilever beam piezoelectric vibrator and a linear cantilever beam piezoelectric vibrator, wherein the cantilever beam piezoelectric vibrator is composed of a cantilever beam, a ceramic piezoelectric sheet (or a piezoelectric film), and a permanent magnet,the three beams are respectively connected with a lower beam, the ceramic piezoelectric sheet (or the piezoelectric film) is symmetrically attached to both sides of a cantilever beam support layer, during lateral excitation, the L-shaped cantilever beam piezoelectric vibrator undergoes nonlinear vibration, the permanent magnets located at free ends of the piezoelectric vibrators are subjected to the gravitational force so that the linear cantilever beam piezoelectric vibrator is made to swing left and right to form a bistable system, and the mechanism has a wider vibration frequency band. Thedevice is advantaged in that the device has a simple structure, is easy to implement, can solve broad and low frequency problems in the research of a current piezoelectric energy capture system and meets needs of rapid development of current microelectronic products.

Description

technical field [0001] The invention belongs to the field of vibration energy capture, and in particular relates to a magnetically coupled multi-beam piezoelectric energy capture device and a bistable implementation method thereof. Background technique [0002] In recent years, nonlinear piezoelectric vibration energy harvesting technology has attracted more and more attention from scholars. Compared with the linear energy harvester, the nonlinear piezoelectric energy harvester has a wider vibration frequency band and better power generation performance. According to theoretical research, the output power of the nonlinear energy harvester is 16.5 times that of the linear energy harvester under the same energy harvesting bandwidth. In the study of nonlinear dynamics, bistable systems, a classic system, are widely used in various research projects, such as bistable circuits, bistable switches, bistable flip-flops, etc. In the piezoelectric energy harvesting system, the magne...

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Problems solved by technology

[0004] In order to solve the problems of wide frequency and low frequency in the current research on piezoelectric energy harvesting systems, and to meet the needs of the rapid development of microelectronic products today, the present invention provides a magnetically coupled multi-beam piezoelectric energy harvesting device and its bistable implementation method

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