能量转换效率
能量收集
能量转换
功率(物理)
联轴节(管道)
能量(信号处理)
电压
机械能
低频
声学
压电
物理
材料科学
核磁共振
光电子学
量子力学
天文
冶金
热力学
作者
Jian Li,Xinxin Han,Xiaobo Rui,Hang Li,Yu Zhang,Wen Zhang,Zhoumo Zeng
标识
DOI:10.1088/1361-6463/ace372
摘要
Abstract This paper proposes a hybrid energy harvester (HEH) based on dual-frequency-up-conversion mechanism, which is suitable for ultra-low frequency rotation. This mechanism takes full advantage of the periodic excitation provided by gravity to achieve two harvesting responses in one cycle. HEH consists of the piezoelectric energy harvester (PEH) and electromagnetic energy harvester. The magnet component achieves frequency up-conversion of PEH by impact, and also induces electrical energy from the coil, thus coupling two parts together to form continuous energy harvesting. The electromechanical coupling model of HEH is established, and the characteristics are in-depth analyzed via experiments and simulations. PEH can attain a bandwidth of 1.4 Hz with an open-circuit output voltage above 5.6 V, which indicates the frequency up-conversion helps the piezoelectric cantilevers to break through the resonance limit and obtain the higher output. HEH can combine the advantages of two energy harvesting parts, obtaining the maximum power of 6.598 mW under 1.5 Hz. The results show that the dual-frequency-up-conversion mechanism greatly improves the efficiency of energy conversion and HEH has the ability to power low-power sensors at ultra-low frequencies.
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