| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 99 === With microelectronic devices, microelectromechanical systems, and wireless sensor modules getting mature, there will be a traditional issue of the battery life and replacement. In order to provide for MEMS components of the power demand. This thesis studies the piezoelectric vibration energy harvester by using the cantilever structure, which can transform the mechanical energy due to vibration into electric energy. COMSOL finite element method is utilized to simulate piezoelectric vibration energy harvester. Analysis of the structure resonance frequency and maximum output power, a piezoelectric vibration energy harvester is designed and fabricated. In order to improve the piezoelectric energy harvester of the power generation efficiency, deformation and stress should be increased. This thesis proposes a design of the base plate of the harvester with several drilled holes to increase the bending stress and power generation efficiency. The output of piezoelectric vibration energy harvester is alternating current which must be rectified for further usage, such as energy storage or power supply of electric device. This thesis also investigates the effect of different circuit configurations, and then, the energy is stored in power management modules to driver a 304-MHz wireless transmitter. The wireless transmitter sends TTL signals to a receiver module with a transmission distance of up to 6 meters. The experimental results show that the piezoelectric cantilever beam with drilled holes can reduce the frequency compared with the piezoelectric cantilever in the same volume condition with no holes, and the output power is increased 6%.
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