基于FPGA的高精度恒流源系统设计  

Design of high precision constant current source system based on FPGA

作　　者：杨博 王强 吴胜华 YANG Bo;WANG Qiang;WU Shenghua(College of Automation&College of Artificial Intelligence,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Thermal Control Research Institute,Nanjing Sac Valmet Automation Corporation Limited,Nanjing 210031,China)

机构地区：[1]南京邮电大学自动化学院、人工智能学院,江苏南京210023 [2]南京国电南自维美德自动化有限公司热控研究所,江苏南京210031

出　　处：《电子设计工程》2024年第19期1-5,共5页Electronic Design Engineering

基　　金：国家自然科学基金资助项目(52105152)。

摘　　要：在工控领域中,被控对象状态通常不断变化,针对传统单变量开环恒流源系统存在延迟、失调的问题,设计了一种以国产FPGA为核心的闭环恒流源系统。通过模数转换器AD7710采集被控设备传感器的电压信号,利用gw2a-lv18pg484微处理器实现增量式PID算法并控制DAC输出的模拟电压信号,经V/I转换电路变成电流信号以实现对设备的闭环控制。经应用测试,系统可输出4~20 mA可调电流信号,最大绝对误差小于16μA,可在被控设备0~800Ω阻值变化范围内保持稳定。In the field of industrial control,the state of the controlled object is usually constantly changing.In response to the problems of delay and imbalance in traditional single-variable open-loop constant current source systems,this paper designs a closed-loop constant current source system with domestic FPGA as the core.The voltage signal of the controlled equipment sensor is collected through the analog-todigital converter AD7710,and an incremental PID algorithm is implemented using the gw2a-lv18pg484 microprocessor to control the analog voltage signal output by the DAC.The signal is converted into a current signal through the V/I conversion circuit to achieve closed-loop control of the equipment.After application testing,the system can output an adjustable current signal of 4~20 mA,with a maximum absolute error of less than 16μA.Maintain stability during changes in the resistance value of the controlled equipment from 0~800Ω.

关 键 词：增量式PID 恒流源 国产FPGA DAC 

分 类 号：TN99[电子电信—信号与信息处理]