双通道热丝法熔点仪的温度测控电路设计  

Design of Temperature Measurement and Control Circuit of Double Channel Hot-wire Smelting Point Instrument

作　　者：肖东海[1] 仲元昌[1] 

机构地区：[1]重庆大学通信工程学院,重庆市400044

出　　处：《电子工程师》2008年第8期75-78,共4页Electronic Engineer

基　　金：重庆大学研究生科技创新基金(200707A1B0090246)

摘　　要：在热丝法熔点仪的研制过程中,温度测控电路的设计是关键环节,针对传统的单热丝法熔点仪测温误差大、升温速度缓慢、恒温时温度稳定度差等缺点,根据PWM(脉宽调制)控制技术和数字PID控制算法原理,提出了一种基于双通道热丝法熔点仪的温度测控电路,实现了对双通道热丝法熔点仪的温度测控,给出了电路的设计与分析过程。实验结果表明:该电路的温度测控性能良好,提高了热丝法熔点仪的整体性能。In the development of hot-wire smelting point instrument, temperature measurement and control circuit is an important part. There are big temperature measurement error, slow pace of warming up, the insta- bility of temperature control of thermostats and with inconveniency to observe experimental results, and so on. With PWM control technology and using digital PID control algorithm principle, we propose a measurement and control circuit based on double channel hot-wire smelting point instrument to realize temperature measure- ment and control of double channel hot-wire melting point instrument. The circuit design and analysis are pres- ented. The experimental results show that the temperature measurement and control circuit perform very well and overall performance of hot-wire smelting point instrument is improved.

关 键 词：热丝法 熔点仪 双通道 PWM 

分 类 号：TP274.4[自动化与计算机技术—检测技术与自动化装置]