智能风冷控制系统.doc

摘 要 本文介绍的基于单片机的变压器智能风冷控制系统是一种结合单片机控制技术、传感器技术、通信技术、电机驱动技术、上位机显示技术的产物。硬件电路包括单片机最小系统、LCD与单片机接口电路、传感器电路、电机驱动电路和电源电路。软件部分下位机采用C语言，以KEIL软件为平台编写，主要包括：控制主程序、传感器数据采集程序、电机运转控制程序、LCD显示程序以及上/下位机通讯程序；上位机采用VB语言编写，主要对下位机传输的数据进行显示及向下位机发送命令。 通过安装在变压器冷却油内部的温度传感器测出实时油温，将测出的油温与从由上位机设定并发送而来的油温标准进行比较，若测量油温低于标准值，则不开启风扇；若测量油温高于标准值，则由单片机控制开启风扇来降温，并通过高出标准值的程度来控制开启风扇的个数，以提高工作效率并减少能耗。 经运行表明，该系统具有界面友好、易操作、易维护、可靠性高、低功耗等特点，具有一定的应用价值。 关键词：DS18B20；单片机；温度采集；风冷控制 Abstract This paper introduces the intelligent transformer air-cooled control system based on single chip processor,which is a kind of product of the combination of single chip microcomputer control technology, sensor technology, communication technology, motor driver technology, PC display technology.The hardware circuit includes the minimum system of the one-chip computer, LCD and MCU interface circuit, sensor circuit, motor drive circuit and power supply circuit. The software adopts C language to edit, based on KEIL software platform, mainly including: control of the main program, data acquisition program, sensor motor control program, LCD display program and / serial communication program; PC using VB language, this part designs to display and to lower computer to send commands to the slave computer transmission data. Through the temperature sensor installed in the internal transformer cooling oil to measure the real-time temperature, comparing the measured temperature and the oil temperature set and sended by the host computer , if the measuring temperature below the standard value, do not open fan; if the measured temperature is higher than the normal value, the single chip computer to control to open the fan to cool down, and through the degree which is higher than the standard value to control the number of open fan, in order to improve work efficiency and reduce energy consumption. The operation results show, this system has the characteristics of friendly interface, easy operation, easy maintenance, high reliability, low power co