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热电偶冷端温度自动补偿系统设计

热电偶冷端温度自动补偿系统设计

摘要:热电偶是应用最广泛的一种温度传感器。本文介绍一种利用数字器件MAX6675作为K型热电偶冷端温度自动补偿电路的器件,通过滤波,信号放大,电压跟随对热电偶的输出信号进行前置处理,利用单片机对补偿后进行了A/D转换的数字信号进行处理.将数字信号转换成测量端的真实值,通过LED动态显示。同时通过键盘输入设定最高报警温度、当实际温度超过报警温度时进行报警以提高安全性。利用MAX6675作为K型热电偶的冷端补偿器,其测量速度快,电路简单,成本低廉,不需要调整,能获得最佳补偿效果,并使温度测量仪表、温度测量、控制系统变得十分简单,可在电子测量、工业仪表、自动化控制等领域。本文对该系统的设计,包括热电偶传感器、冷端补偿系统、单片机接口及其应用程序以及信号的滤波处理等进行了详细的分析和说

明。

关键词:热电偶;MAX6675;单片机;冷端补偿

A design of thermocouple cold end temperature automatic compensation system

Abstract :Thermocouple is a kind of the most widely used temperature sensor. This article referred to the use of digital devices MAX6675 as a K-type thermocouple cold junction temperature compensation circuit device, through the filter, signal amplification, voltage follow to deal with output signal of the thermocouple. At the same time, it uses SCM to process the digital signal, which has been converted by A/D convert device. The digital signal could be converted to true value of the measuring junction and could be dynamic displayed by LED. Also, it can be input specified maximum alarm temperature through the keyboard. What is more, when the actual temperature breaks up the alarm temperature, it will alarm, and by this method, it enhances security. With MAX6675 as a K-type thermocouple cold junction compensation device, the measurement speed could be fast, circuit could be simple and has low cost, no adjustment could be needed, it can get the best compensation effect and enable temperature measurement instrumentation, temperature measurement, control systems become very simple. Further more, in electronic measurement, industrial instrumentation, automation control, and other fields, it can be promoted. In this paper, the design of the system, including thermocouple sensors, cold junction compensation system, SCM interface, application program Signal filter and other processing, is be detailed analysis and explanation.

Keywords:Thermocouple;MAX6675;SCM ;Cold junction compensation ........................

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