基于振动能量采集器的无源无线传感节点技术研究

随着以MEMS技术为依托，结合压电效应的振动能量采集技术的日臻完善，如何利用振动能量采集器构成高效的无源无线传感节点成为近期研究热点，而能量采集器输出的电能储存控制和低功耗发射技术是实现该节点的难点。在设计出对储能电容电压具有双阈值检测与控制功能的低功耗电路基础上，给出了一种自报警、无源无线低功耗传感节点。实验表明，在频率52 Hz正弦振动、振动加速度幅值为5 gn激励下，经过125 s的能量储存，节点能够以+10 dBm功率在16 ms内完成发射及无线报警，发射距离可达1.31 km。该节点构成的无线传感网络可广泛应用于石油管线、桥梁和军事侦察等外部供电极度受限环境的现场监控等用途。

Research of self-powered wireless sensing node based on vibration energy harvester

With the development of MEMS technology and the improvement of vibration energy harvester based on piezoelectric effect,how to use vibration energy harvester to power the sensor node has become the focus of current research,how to control the of stored energy and low power emission technology are the research difficulties. A power management circuit is proposed to realize fully self-powered wireless sensor node. The circuit can autono?mous monitor two threshold-voltages with an ultra-low power consumption. Test results showed that excited by 5 gn sinusoidal acceleration at 52 Hz,after 125 seconds of energy storage the sensor node can wireless send a signal with a maximum transmitting power of+10 dBm within 16ms,the transmission distance can be 1.31 kilometers. The wire?less sensor network can be widely used in applications like pipelines/bridges security surveillance,military recon?naissance and other onsite monitoring circumstances when the external power supply is extremely limited.