摘要:随着计算机的发展，单片机在各种领域得到越来越广泛的应用。

　　　单片机是一种集成电路芯片，是采用集成电路技术把中央处理器、随机存储器RAM和ROM、I/O口和中断系统、定时器/计时器等功能集成到一块硅片上形成的一个微型计算机系统。

　　　电冰箱温度控制系统是采用数字式温度传感器DS18B20完成对电冰箱冷藏（冻）室温度数据采集，并将采集到的数据转换为数字信号传送到AT89S52分析处理，达到智能控制目的。本系统采用AT89S52单片机作为控制核心，通过单片机对SA8382专用芯片的控制产生PWM信号，用PWM信号去控制功率模块组成逆变电路，输出不同频率的交流电，实现压缩机的变频控制，达到可变制冷的目的。

　　　本文在第一章介绍电冰箱的系统组成、工作原理以及变频冰箱的特点；第二章介绍了控制系统总体设计方案；第三、四章介绍了控制系统的硬件和软件的设计。 

关键词  AT89C51单片机；DS18B20传感器；LCD1602显示器;温度控制

Abstract:With the development of computer, computer is more and more widely used in various fields.

　　　SCM is a kind of integrated circuit chip, which is in the use of integrated circuit technology to CPU , RAM and ROM, I/O port and interrupt system, timer / timer functions ,which is integrated into a micro computer system to form a silicon chip.

　　　Refrigerator temperature control system is in the use of digital temperature sensor DS18B20 to complete the refrigerator refrigeration (frozen) room temperature data collection, and the collected data is converted to a digital signal is transmitted to the AT89S52 processing, which is to achieve intelligent control. This system uses AT89S52 as the control core, PWM signals generated by single chip on the SA8382 control chip, which is to control the power module inverter circuit for PWM signal, the output of different frequency alternating current, the compressor frequency control,which is to achieve the purpose of variable refrigeration.

　　　In this paper, the first chapter introduces composition work principle and variable frequency refrigerator refrigerator; the second chapter introduces the overall design scheme of the control system; the third, the four chapter introduces the design of hardware and software of control system.

Keywords  AT89C51 single-chip microcomputer  DS18B20 sensors  LCD1602 display  The temperature control