Research On The High-performance Vibration Energy Harvester

As the fossil is the non-renewable energy resource in the world and the possibility of getting energy from the environment and used into the wireless node system, energy harvesting has achieved more and more attention all around the world, especially the research on high quality energy harvesterIn this paper, considering the shortage of conventional energy harvester, a strategy to utilize a branched beam system to improve the frequency response characteristic of vibration energy harvesting is demonstrated. A basic unit of the device consists of several branch beams with proof mass at their ends and one main cantilever beam with a piezoelectric component at its root and proof mass at its end. The device can utilize the resonance of the branch beams and main beam to generate multiple output voltage peaks, providing a better frequency response characteristic than that of the conventional piezoelectric vibration energy harvester.In order to further improve the characteristic of the branched beam system, two solutions have been indicated in the paper, namely multiple branch structure and multiple basic units with similar structures. Through the improvement of the structure, the branched beam system can be connected to generate more output voltage peaks in the frequency response characteristic.Meanwhile, only one piezoelectric component is needed in the device, which makes it competitive in the management of harvested electric energy.