Piezoelectric Vibration Energy Harvester Using Indirect Impact of Springless Proof Mass

S. Ju, C. H. Ji

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Article number012122
JournalJournal of Physics: Conference Series
Volume660
Issue number1
DOIs
StatePublished - 10 Dec 2015
Event15th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2015 - Boston, United States
Duration: 1 Dec 20154 Dec 2015

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