Piezoelectric Vibration Energy Harvester Using Indirect Impact of Springless Proof Mass

[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.

[发布机构] Department of Electronics Engineering, Ewha Womans University, Seoul, Korea, Republic of^1

[效力级别] 能源学

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