摘要
针对现有准分布式光纤漏水传感器中所需的LED灯电流稳定输出要求,提出一种光强和电流反馈的双闭环LED驱动控制系统。首先,LED驱动电路采用带有缓启动的降压(Buck)电路,并建立LED数学模型;其次,设计电流环,并在此基础上设置光强环;最后,设计LED光强控制的模糊自适应PI调节器,提高控制系统的动态性能。仿真结果表明:相比于传统PI调节器,模糊自适应PI调节器调节时间从0.007 s缩短至0.003 s,超调量从15%降低至1%,跟踪性能较好,可以更快更精准地达到传感器中LED灯需要的光照强度。
A dual-closed-loop LED drive control system with light intensity and current feedback is proposed to meet the requirements for stable current output in existing quasi-distributed fiber optic water leakage sensors.Firstly,the LED drive circuit adopts Buck circuit with soft-start,and the LED mathematical model is established.Secondly,the current loop is designed,and the light intensity loop is set up on this basis.Finally,a fuzzy adaptive PI regulator for LED light intensity control is designed to improve the dynamic performance of the control system.The simulation results show that compared with the traditional PI regulator,the fuzzy adaptive PI regulator can shorten the adjustment time from 0.007 s to 0.003 s,and reduce the overshoot from 15%to 1%.The tracking performance is better,and the light intensity required by the LED in the sensor can be reached faster and more accurately.
作者
王欢
乔文生
卢春霖
苑佳馨
侯钰龙
张彦军
WANG Huan;QIAO Wensheng;LU Chunlin;YUAN Jiaxin;HOU Yulong;ZHANG Yanjun(State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument,North University of China,Taiyuan 030051,China;School of Instrumentation and Electronics,North University of China,Taiyuan 030051,China;Inner Mongolia Aerospace Power Machinery Testing Institute,Hohhot 010010,China)
出处
《传感器与微系统》
北大核心
2025年第9期71-75,共5页
Transducer and Microsystem Technologies
基金
山西省应用基础研究计划项目(2210600064MZ)。
关键词
漏水检测
光纤
LED
降压驱动电路
模糊PI控制
water leakage detection
optical fiber
LED
Buck drive circuit
fuzzy PI control
