基于压电振动能采集器的无线频率检测节点  

A Wireless Frequency Detection Node Based on Piezoelectric Vibration Energy Harvesters

作　　者：程耀庆 张闯[1] 贺学锋[1,2] 祝由 李思宇[1] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400044 [2]重庆大学微系统研究中心,重庆400044

出　　处：《压电与声光》2014年第6期981-986,共6页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(61076106;61376116);高等学校科技创新工程重大项目培育基金资助项目(708072)

摘　　要：振动频率检测在旋转机械运行状态监测和大型建筑物结构健康监测等领域具有重要应用,为了实现振动频率检测节点的自供能,该文设计了基于压电振动能采集器的无线振动频率检测节点,该节点由两个压电振动能采集器、电源管理电路和无线测频电路组成。利用LTC3588-1和LT3009芯片组成的电源管理电路,将采集器一输出的交流电压整流稳压转换为直流电压为节点供电,采用低功耗微控制器MSP430F149对采集器二的输出电压进行处理得到环境振动频率,进一步利用无线收发芯片nRF24L01实现信号的发送。振动台实验表明,在加速度幅值为1 g(g=9.8m/s2),振动频率为53Hz时,该节点可每隔120s无线发送环境的振动频率。The vibration frequency detection plays an important role in the monitoring of the operating status of rotating machineries, the health monitoring of large buildings and etc. To realize the self-power of the vibration frequency detection node, this work designed a wireless vibration frequency detection node which composed of two piezoelectric vibration energy harvesters, a power management circuit and a wireless frequency measurement circuit. The power management circuit, consisted of LTC3588 1 and LT3009 chips, converts the AC voltage from one harvester to DC voltage to power the wireless node. The ambient vibration frequency is obtained by analyzing the output voltage from the other harvester with a low-power microcontroller MSP430F149, and the vibration frequency is sent out by a wireless transceiver chip nRF24L01. Experiments on a shaker showed that the node could wirelessly send out environmental vibration frequency at every 120 s intervais when the magnitude and the frequency of ambient acceleration were 1 g and 53 Hz, respectively.

关 键 词：压电 能量采集 振动 无线传感节点 频率检测 

分 类 号：TN384[电子电信—物理电子学]