基于FPGA与STM32的多通道温度采集系统设计

Design of multi-channel temperature acquisition system based on FPGA and STM32

针对热加工领域对测温准确性、及时性提出的更高要求以及产品多点分布测温等问题,该文设计了一种多通道温度采集系统。该系统利用E型热电偶,抗混叠滤波器,MAX31856采集电路,以及由FPGA与STM32组成的测温系统对加工过程进行温度测量;前端调理电路将E型热电偶采集的电压信号进行放大滤波处理,然后通过MAX31856采集电路进行冷端补偿后将其转换为数字量,最后由FPGA通过接收STM32的指令对数据进行采集存储以及实时显示。实验结果表明该多路测温系统在0~400℃的测温范围内、测量精度低于±0.2%,测量温度分辨率达到0.06℃,并且响应速度快、反应灵敏,在热加工领域具有一定的应用价值。

Aiming at the higher requirement of temperature measurement accuracy and timeliness in the field of hot processing and the problems of multi-point distribution temperature measurement of products,a multi-channel temperature acquisition system is designed in this paper.The system uses e-type thermocouple,anti-aliasing filter,MAX31856 acquisition circuit,and temperature measurement system composed of FPGA and STM32 to measure the temperature in the machining process.The front-end conditioning circuit amplifies and filters the voltage signal collected by E-type thermocouple,and then converts it to digital quantity after cold end compensation by MAX31856 acquisition circuit.Finally,FPGA collects and stores the data and displays it in real time by receiving STM32 instructions.The experimental results show that the multi-channel temperature measuring system is within the temperature measuring range of 0~400℃,the measurement accuracy is less than±0.2%,the temperature resolution is 0.06℃,and the response speed is fast and sensitive,which has certain application value in the field of hot processing.