Jiang Bing, Zhu Fan, Yang Yi, Zhu Jingyu, Yang Yuting, Yuan Ming
College of Automation & College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Key Laboratory of Architectural Acoustic Environment of Anhui Higher Education Institutes, Hefei 230601, China.
Micromachines (Basel). 2023 Jan 18;14(2):240. doi: 10.3390/mi14020240.
Vibration-energy harvesting is an effective strategy for replacing batteries and provides a long-term power supply to microelectronic devices. Harvesting vibration energy from human motions has attracted research attention in recent years. Here, a novel low-frequency hybrid piezoelectric and electromagnetic broadband harvester is proposed. Two parallel piezoelectric cantilever beams support the harvester and capture environmental vibration energy based on the piezoelectric effect. A permanent magnet is connected by springs to the two beams, and a fixed coil surrounds the moving permanent magnet, enabling energy conversion via the electromagnetic effect and the proof mass. The parameters influencing the output power of the harvester are optimized numerically to boost the harvester's performance. The output power of the proposed hybrid harvester is compared with that of a piezoelectric harvester and an electromagnetic harvester. The simulation results show that the output power is significantly higher for the hybrid harvester than for the piezoelectric and electromagnetic harvesters, and the bandwidth is broader owing to the double cantilevers. An experiment is conducted using a prototype of the hybrid harvester to evaluate its output power. The results show multiple resonant peaks, an extended bandwidth, and a maximum power of 6.28 mW. In contrast, the maximum harvested power of the piezoelectric harvester is only 5.15 mW at 9.6 Hz.
振动能量采集是一种替代电池的有效策略，可为微电子设备提供长期电源。近年来，从人体运动中采集振动能量引起了研究关注。在此，提出了一种新型的低频压电与电磁混合宽带能量采集器。两根平行的压电悬臂梁支撑着该采集器，并基于压电效应捕获环境振动能量。一块永磁体通过弹簧连接到两根梁上，一个固定线圈围绕着移动的永磁体，通过电磁效应和质量块实现能量转换。对影响采集器输出功率的参数进行了数值优化，以提高采集器的性能。将所提出的混合能量采集器的输出功率与压电能量采集器和电磁能量采集器的输出功率进行了比较。仿真结果表明，混合能量采集器的输出功率明显高于压电和电磁能量采集器，并且由于采用了双悬臂梁，带宽更宽。使用混合能量采集器的原型进行了实验，以评估其输出功率。结果显示出多个共振峰、扩展的带宽以及6.28毫瓦的最大功率。相比之下，压电能量采集器在9.6赫兹时的最大采集功率仅为5.15毫瓦。
