Piezoelectric Vibration Energy Harvester Using Indirect Impact of Springless Proof Mass

15th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Ju, S.^1 ; Ji, C.-H.^1

Department of Electronics Engineering, Ewha Womans University, Seoul, Korea, Republic of^1

关键词: Average power;    Electric power;    External vibrations;    Macro fiber composite;    Parallel-connected;    Piezoelectric cantilevers;    Piezoelectric vibration;    Proof of concept;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/660/1/012122/pdf
DOI  :  10.1088/1742-6596/660/1/012122

来源: IOP

【 摘 要 】

This paper presents an impact-based piezoelectric vibration energy harvester using freely movable spherical proof mass and MFC (Macro Fiber Composite) beams as piezoelectric cantilevers. When external vibration is applied, a metal sphere moves freely along the channel and collides with both ends of the cavity, which induces the vibration of parallel- connected MFCs and generates electric power. A proof-of-concept device having the form- factor of a wristwatch has been designed and tested. Moreover, spherical proof mass made of different materials has been tested to analyze the relationship between output power, long-term reliability, and audible noise level during operation. Maximum peak-to-peak open circuit voltage of 41.2V and average power of 908.7 μW have been obtained in response to a 3g vibration at 17Hz for device with parallel-connected MFC beams.