电冰箱的温度测控系统设计.doc

摘 要 自从1974年石油危机以来，节约能源的呼声越来越强烈。在这种情况下，人们就提出了发展低能耗家用冰箱的要求。与间冷式冰箱相比，直冷式冰箱效率高，能耗低。近年来，随着微电子技术、传感器技术以及计算机控制技术的发展，人们对电冰箱的控制功能要求越来越高，这对电冰箱控制器提出了更高的要求，多功能、人性化和节能是其发展方向。为此，本文介绍了采用AT89C51单片机作为控制器核心，对电冰箱的工作过程进行控制，并用声音将电冰箱的一些工作过程进行提示，使控制过程更人性化。通过DS18B20温度传感器对冷藏室温度,冷冻室温度进行检测，并将产生的模拟信号，通过ADC0809进行A/D转换送入单片机；对霜厚度则通过热敏电阻进行温度检测后产生中断信号送入单片机。温度检测信号经单片机处理后用语调节压缩机和加热器的工作，满足消费者对温度的设置要求，实现自动除霜功能。 关键词：AT89C51单片机,A/DC0809,8279，DS18B20，直冷式电冰箱的电控系统。 Abstract Since the oil crisis in 1974, the voice of energy conservation is becoming stronger and stronger. In this case, people put forward the requirements of the development of low energy consumption of household refrigerators. Compared with direct refrigerator, refrigerator with high efficiency, low energy consumption.in recent years, with the development of microelectronic technology, sensor technology and computer control technology, people on the refrigerator control function and the higher, which to the refrigerator controller proposed higher requirements, multi function, humanization and energy-saving is the direction of its development. To this end, this paper introduces the using AT89C51 microcontroller as the core controller, the working process of the refrigerator control, and voice will prompt some refrigerators working process and the control process is more humanized. Through DS18B20 temperature sensor to the temperature of the refrigerating chamber, were detected with the temperature in the freezing chamber, and will produce the analog signal, through the ADC0809 A / D conversion into the microcontroller; the frost thickness is through the thermistor for temperature detection to generate interrupt signal into the microcontroller. Temperature detection signal after the microcontroller processing language to adjust the compressor and the heater, meet the requirements of consumers set up the temperature, realize the automatic function of the cream. Keywords: AT89C51 microcontroller, A/D DS18B20, Electric control syste