AT89C51 单片机的户式中央空调温度控制系统设计+电路图+程序
毕业论文关键词：中央空调；单片机；温度控制；变频技术
Abstract Nowadays separate air conditioners have been unable to meet the needs of living environment. So central air-conditioning came into being. The traditional central air-conditioning controls the temperature by setting the mechanical temperature control switch to make the room constant-temperature. On one hand, this control method is not convenient. On the other hand, the temperature fluctuation range is large. The household central air-conditioning based on MCU combines hardware with software, which not only improves the air- conditioning function, but also simplifies the control and operation of air- conditioning. This intelligent indoor temperature adjustment can meet the different requirements of different users to the environment temperature. This paper analyzes the working principles of household central air-conditioning and the two key technologies--digital frequency conversion technology & electronic expansion valve technology. It designs a household air-conditioning temperature control system based on AT89C51. The hardware part mainly consists of AT89C51, the power supply circuit, temperature acquisition circuit, pressure transmitter circuit, keyboard, display circuit, wind speed control circuit and other peripheral devices etc. The software is programmed by 8051C language. The system can complete multiple functions such as temperature display & setting, wind speed control, the compressor frequency control， temperature- limiting alarm etc.
Keywords: Central Air-conditioning; SCM; Temperature Control; Frequency Conversion
目录
摘要.I
AbstractII
1绪论.5
1.1前言.5
1.2中央空调控制技术的发展.5
1.2.1中央空调控制技术的现状.5
1.2.2中央空调控制技术的发展趋势.6
1.3本文的主要工作.7
2户式中央空调的工作原理.8
2.1空调器的基本工作原理.8
2.2控制器部分的介绍.9
2.2.1主要特性.9
2.2.2内部结构10
2.3小型VRV中央空调系统的原理及特点11
2.4小型VRV中央空调系统的关键技术12
2.5数字变频技术13
2.6电子膨胀阀技术14
2.6.1电子膨胀阀的工作原理14
2.6.2电子膨胀阀系统的结构15
2.6.3电子膨胀阀在制冷系统中的作用15
3压力变送与变频控制系统17
3.1控制系统的总体设计17
3.2压力变送电路的设计17
3.3变频控制电路的设计18
4温度显示与风速控制系统20
4.1温控系统方案设计20
4.1.1温度传感器的选择20