高性能通用温度采集仪的研制

作者：张震，王剑，黄国辉，姜周曙 日期：2010-06-21/span> 浏览：3660 查看PDF文档

高性能通用温度采集仪的研制
张震，王剑，黄国辉，姜周曙
（杭州电子科技大学 自动化学院，浙江 杭州 310018）

摘要：温度采集是现代测控系统的重要内容之一。针对工业现场这一问题，研制了一套多通道、高性能、通用温度采集仪。该系统以ARM Cortex系列的STM32芯片和24位AD芯片AD7793为核心，详细介绍了其温度采集电路、数字量输入输出电路、液晶显示电路、存储电路和通讯接口电路的设计。该采集仪在同一个模拟输入通道上实现了对热敏电阻、三线制热电阻、四线制热电阻、热电偶等信号的通用采集，通过RS232/485、USB、CAN等总线接口与上位机或数据采集网络进行了通讯或显示等，能够适用于多种场合。实验结果表明，其设计结构合理，精度较高，结果令人满意。
关键词：温度采集；通用；STM32；硬件电路；USB接口
中图分类号：TP274文献标识码：A文章编号：1001-4551(2010)03-0080-05

Study of high performance generalpurpose temperature acquisition instrument

ZHANG Zhen, WANG Jian, HUANG Guohui, JIANG Zhoushu
(School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China)

Abstract: Temperature acquisition is one of the key sectors in modern measurement and control system. Aiming at the desire of industrial environment, high performance and generalpurpose temperature acquisition instruments with multichannels based on STM32 were fabricated. The system was developed based on ARM Cortex series MCU and 24bit A/D deviceAD7793, and its parts were designed, which included temperature acquisition circuit, digital input/output circuit, LCD circuit, storage circuit, communication interface circuit. Through every analog input channel, the temperature collection of thermistor, 3Wire/4Wire RTD and thermocouple signal collection was achieved, and communication with PC, data acquisition network or display on PC with multiple communication interfaces were realized, including RS232/485、USB、CAN bus interface for different environment. The experiment results demonstrate that the system has reasonable structure and high precision and satisfactory results.
Key words: temperature acquisition; generalpurpose; STM32; hardware circuit; USB interface