多功能分析仪温度控制系统设计

Design of temperature control system for multi function analyzer

多功能生化分析仪温度控制的精确度和稳定性将影响生化、血凝、特定蛋白测试的准确性。本文设计的温度控制系统,在硬件上采用Cortex-M3控制器,结合温度采集、A/D转换、按键设置、显示屏等外围电路;在软件上,利用常规PID算法实现对温育槽的温度控制。针对常规PID算法不能适应外界环境变化的缺点,基于BP神经网络的PID控制器完成对温度的智能化控制。通过温度测试实验表明,所涉及的基于BP神经网络的PID控制器实现仪器在不同地域、国家环境下,可自动调整PID算法相关参数的功能,达到自整定控温目的,在设定目标处实现±0.1℃的重复性指标。

The accuracy and stability of the temperature control of the multifunctional biochemical analyzer will affect the accuracy of the biochemical,blood coagulation and specific protein test.In this paper,the design of temperature control system,the Cortex-M3 controller is adopted in the hardware,combining the temperature acquisition,A/D conversion,set the key,display and so on peripheral circuit,the software using conventional PID algorithm to achieve the incubation tank temperature control.According to the conventional PID algorithm can＇t adapt to changes in the external environment of the shortcomings,designed in this paper based on PID neural network BP controller of intelligent temperature control.Through the experiment of temperature test showed that involved based on BP neural network PID controller to realize the instrument in the environment of different areas and countries,can automatically adjust the parameters of the PID algorithm,achieve the repeatability of the self-tuning control target,in setting target realizes±0.1 ℃ C index.