[关键词]
[摘要]
以同时提升多模态采集和增加带宽为研究方向,结合多模态扩频理论,建立了一套多模态宽频且能多方向工作的压电振动能量采集系统。该系统包含能量采集器和电源管理电路两个模块。其中,采集器包括4种谐振频率,组成了较宽的工作频带,保证了该采集器在低频振动工作环境下高效率地收集振动能量;电源管理电路将采集到的交流电转换为稳定的直流电,再对电容或电池等储能元件充电以供微电子器件使用。经过模态和谐响应分析后,搭建了实验平台并对采集系统进行实验测试。实验结果表明,在加速度6 m/s2 简谐力激励下,工作频带为16.1~27.8 Hz,输出电压最高可达35.75 V,阻抗匹配后最优阻值为200 kΩ,此时输出功率为115.85 μW。
[Key word]
[Abstract]
In this study, multimodal acquisition and bandwidth broadening are enhanced by employing multimodal
spread spectrum theory to establish a versatile piezoelectric vibration-energy acquisition system. The system
comprises two modules-an energy collector and a power-management circuit. The collector operates across four resonant
frequencies, thus ensuring efficient energy harvesting in low-frequency vibration settings. The power-management
circuit converts AC power into stable DC power for charging energy-storage components. Following modalharmony
response analysis, an experimental platform is constructed for system testing. Experimental results indicate
an operational frequency band of 16.1 to 27.8 Hz, with a peak output voltage of 33.75 V under a simple harmonic
force and an acceleration of 6 m/s2. Upon impedance matching, the optimal resistance value is shown to be
200 kΩ, which results in an output power of 115.85 μW.
[中图分类号]
TN384
[基金项目]
重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0137)
