物联网中的光纤供能传感系统设计与实现

采用光纤供能技术,即高能量激光束经过抗电磁 干扰的光纤链路传输,并通过光伏能量转换器(PPC) 转换为电能后以安全地驱动传感节点,从而构建了恶劣环境下的物联网传感系统。设计了阻 抗匹配跟踪方 法使PPC在连接任意负载时尽可能地输出最大电功率,从而提高了供能效率 ；基于此方法实现 的电源管理器对能量进行存储,并为传感节点提供合适的驱动电压；进而,设计了简单 可靠的自定义通 信协议以调节传感节点的工作模式,从而降低传感节点功耗而提高系统的应用能力。在 构建的光纤供 能传感系统中,PPC在1.5W的入射光功率下最大可输出555mW的稳定电功率,有效光电转换效 率达到37%。传感系统可以稳定地在2km范围的复杂环境下采集、处理与显示传感信息,为 安全可靠的物联网传感技术提供了新颖的解决方案。

Design and realization of a power-over-fiber sensor system for internet of thi ngs

In this paper,a sensor system for the internet of things under ex treme environment is developed based on the power-over-fiber technique.Via this technique,high laser power is transmitted over fiber link,and is converted into electric energy by photovolta ic power converter (PPC) at the end of the link.As the fiber is inherently immune to electroma gnetic interference, the converted electric energy drives sensor nodes safely.To improve the power- supply efficiency,the impedance-matching tracking method is proposed to enable the maximum electric p ower output of the PPC for any load.Based on this method,a smart power manager is realized to sto re the electric energy and an appropriate voltage is set to drive the sensor nodes.Moreover,a simple and reliable communication protocol is proposed to adjust the working mode of the sensor node s.In this way, the power consumption of nodes is reduced and the applicable ability of the sys tem is enhanced. In the power-over-fiber sensor system constructed in this paper,the maximum e lectric energy output of PPC is 555mW when the incident optical power is 1.5W,and the effective opti cal-electric conversion efficiency is 37%.The system can sample,process and display sensing information stably over a distance of 2km.Such a system affords a novel solution to realize the internet of things safely and reliably.