A piezoelectric energy harvesting device and method capable of automatically adjusting resonant frequency and bandwidth

Abstract

The invention discloses a piezoelectric energy harvesting device and method for automatically adjusting resonant frequency and bandwidth, characterized in that the piezoelectric plate is arranged on the cantilever beam, A cantilever beam is mounted on a fixed base, The micro motor is mounted on the cantilever beam through a motor bracket, the shaft of the micro motor is connected with the screw rod and can drive the screw rod to rotate, the other end of the screw rod is also fixed on the cantilever beam through the screw rod bracket, the mass block is mounted on the screw rod through threads corresponding to the screw rod, and when the screw rod rotates, the mass block can move along the screw rod direction. Circuit system plate are connected with piezoelectric plate for vibration energy capture, and judging whether the environmental vibration frequency matches the natural frequency of the piezoelectric energy harvesting device from the output signal of the piezoelectric piece, By controlling the forward and backward rotation of the micro-motor, the position of the end mass of the cantilever beam can be adjusted, and the distance between the mass and the motor can be adjusted, so that the first-order resonant frequency point of the piezoelectric energy harvesting device and the band width of the first-order and second-order superposition can be adjusted automatically.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric vibration energy capture, in particular to a piezoelectric energy capture device and method for automatically adjusting resonance frequency and bandwidth. Background technique [0002] As wireless sensor networks are widely used in real life, their power consumption is getting lower and lower. This makes it possible to use energy in the environment to provide energy for wireless sensor network nodes. At present, the energy that can be used in the environment includes light energy, heat energy, vibration energy, etc., and vibration energy widely exists in our living environment, such as human body. Motion, vibration of the vehicle, etc. For this reason, researchers have begun to study the technology of collecting vibration energy in the environment and converting it into electrical energy, so as to provide electrical energy for wireless sensor network nodes. [0003] At present, the most re...

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Problems solved by technology

However, none of these piezoelectric vibration energy harvesting devices can actively and precisely adjust the resonance frequency of the cantilever beam to quickly achieve high-efficiency energy capture.

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