基于STM32的大功率LED阵列高精度制冷控制系统  

High-power LED array high-precision refrigeration control system based on STM32

作　　者：钱依凡 薛凌云[1] 洪哲扬 Qian Yifan;Xue Lingyun;Hong Zheyang(School of Automation,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学自动化学院,浙江杭州310018

出　　处：《电子技术应用》2021年第9期75-81,共7页Application of Electronic Technique

基　　金：国家重大科研仪器研制资助项目(61427808)。

摘　　要：LED结温动态严重影响其光学特性变化规律,针对大功率LED阵列散热需求,利用半导体制冷器(Thermoelectric Cooler,TEC)设计一套制冷控制系统。开关电源易产生较强电磁干扰,设计具有快响应时间、高稳定度特点的可编程线性电源驱动TEC稳定工作。针对常规线性PID对具有非线性特征的TEC制冷控制系统存在快速性和超调量难以兼得的问题,于STM32嵌入式实现模糊RBF神经网络PID控制,并用6×3 W大功率LED阵列进行测试,实验结果证明相比于常规线性PID控制,调节时间缩短,超调量减少,温度波动仅为±0.1℃,该系统在保持大功率LED阵列工作环境温度稳定的同时可提升其输出光效。The dynamics of the LED junction temperature seriously affect the changing laws of its optical characteristics.Aiming at the heat dissipation requirements of high-power LED arrays,a refrigeration control system is designed using thermoelectric cooler.Switching power supplies are prone to strong electromagnetic interference,a programmable linear power supply with fast response time and high stability is designed to drive TEC to work stably.Aiming at the problem that conventional linear PID has difficulty in achieving both rapidity and overshoot for the TEC refrigeration control system with nonlinear characteristics,this system is embedded in STM32 to realize fuzzy RBF neural network PID control,uses 6×3 W high-power LED array for testing,the experiment results proved that compared with the conventional linear PID control,the TEC refrigeration control system has shortened the adjustment time,reduced the overshoot,and the temperature fluctuation is only±0.1℃.The refrigeration control system can improve the output light efficiency while maintaining the stable working environment temperature of the high-power LED array.

关 键 词：STM32 大功率LED阵列 半导体制冷器 模糊RBF神经网络PID 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TN364.2[自动化与计算机技术—控制科学与工程]