毕业论文：基于单片机AT89S52的水温控制系统.doc

基于单片机AT89S52的水温控制系统  PAGE \* MERGEFORMAT V 毕业设计（论文）报告 课题名称：基于单片机AT89S52的水温控制系统 摘 要 温度是工业控制对象主要被控参数之一，在温度控制中，由于受到温度被控对象特性（如惯性大、滞后大、非线性等）的影响，使得控制性能难以提高，有些工艺过程其温度控制好坏直接影响着产品的质量，因而设计一种较为理想的温度控制系统是非常有价值的。 本设计介绍了以AT89S52单片机为核心的温度控制系统的工作原理和设计方法。温度信号由线性度较好的电流型温度传感器AD590采集，经过电流-电压转换及放大电路后将信号输入模数转换器ADS7818P转换为数字信号，最后传送给单片机，并通过可控硅的通断控制加热装置的平均功率。文中介绍了该控制系统的硬件部分，包括：温度采集电路、信号变换电路，温度控制电路 ，温度显示电路。单片机通过对信号进行相应处理，从而实现温度控制的目的。文中还介绍了软件设计部分，在这里采用模块化结构，主要模块有：数码管显示程序、键盘扫描及按键处理程序、温度信号处理程序和PWM控制程序。实验结果表明该系统可实现对温度的测量，并能根据设定值对温度进行调节，实现控温的目的。 关键字：AT89S52 ， 水温控制 ， 可控硅 ， M0C3041 Abstract The temperature is one of the mainly charged parameters which are industrial control targets. It is difficult to enhance the control performance due to the characteristics of the temperature charged object. Such as inertia, hysteresis and non-linear, etc…Its temperature control process will have a direct impact on the quality of the product in some technological process. Therefore it is absolute valuable to design an ideal temperature control system. The paper introduces the theory and the design method of temperature control system,the systematic core of which is AT89S52.The temperature can be gathered by the temperature transducer AD590 with a good linearization and then the signals should be turned through the Current-Voltage circuit and finally the signal should be sent to ADS7818P to be changed from analog signals to digital signals and then to the single chip and control the average power of the heater through controlled silicon’s breakover. The paper introduces the hardare of the control system.Its hardware circuit includes temperature gathering, signal convert,temperature control ,temperature display,and keyboard input .The single chip can control the temperature by dealing with the signals properly.The paper also introduces the software of the design .The main procedures are designed with the modularize structure ,which is easy to realize.The main procedures in