Xu Chaoqun, Li Yuanbo, Yang Tongqing
Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Functional Materials Research Laboratory, School of Materials Science and Engineering, Tongji University, 4800 Cao'an Road, Shanghai 201804, China.
Micromachines (Basel). 2020 Oct 28;11(11):963. doi: 10.3390/mi11110963.
Piezoelectric energy harvesting technology using the piezoelectric circular diaphragm (PCD) has drawn much attention because it has great application potential in replacing chemical batteries to power microelectronic devices. In this article, we have found a non-uniform strain distribution inside the PCD energy harvester. From the edge to the center of the ceramic disk, its output voltage first increases and then decreases. This uneven output voltage reduces the output power of the PCD energy harvester. Based on this phenomenon, we reduce the ceramic disk diameter and dig a hole in the center, analyzing the effect of removing the ceramic disk's low output voltage part on the PCD energy harvester. The experimental results show that removing the ceramic disk's low output voltage part can improve the output power, reduce the resonance frequency, and increase the optimal impedance of the PCD energy harvester. Under the conditions of 10 g proof mass, 9.8 m/s acceleration, the PCD energy harvester with a 19-mm diameter and a 6-mm hole can reach a maximum output power of 8.34 mW.
利用压电圆形膜片（PCD）的压电能量收集技术备受关注，因为它在替代化学电池为微电子设备供电方面具有巨大的应用潜力。在本文中，我们发现PCD能量收集器内部存在应变分布不均匀的情况。从陶瓷圆盘的边缘到中心，其输出电压先升高后降低。这种不均匀的输出电压降低了PCD能量收集器的输出功率。基于这一现象，我们减小了陶瓷圆盘的直径并在中心挖了一个孔，分析去除陶瓷圆盘低输出电压部分对PCD能量收集器的影响。实验结果表明，去除陶瓷圆盘的低输出电压部分可以提高输出功率、降低共振频率并增加PCD能量收集器的最佳阻抗。在10 g的验证质量、9.8 m/s加速度的条件下，直径为19毫米且有一个6毫米孔的PCD能量收集器可达到的最大输出功率为8.34毫瓦。
