【作者】 周波；

【导师】 李昌禧；

【作者基本信息】 华中科技大学 ， 检测技术与自动化装置， 2007， 硕士

【摘要】 变频空调可以节约空调用电量,减轻电力供应的压力,同时可带动其它产业的发展,在全球对能源危机和环境保护问题的呼声越来越高的今天,其发展具有巨大的社会效益和经济效益。变频空调室内机和室外机间通信的准确率和实时性对于整个空调系统的工作性能起着很重要的作用。所以,研究变频空调的通信电路,提高通信成功率有重大意义。论文首先详尽介绍了变频空调的国内外最新发展状况,指出了变频空调现有通信电路存在的问题。通过分析变频空调通信环境的特殊性并比较常用通信方式的利弊,肯定了电流环这一适用于变频空调的通信方式。在此基础上,使用PSPICE软件对如何提高通信电路可靠性进行大量仿真研究,通过仿真结果,结合对干扰成因的理论分析,提出了通信系统的抗干扰措施:系统硬件有针对性的做抗干扰设计,尤其是在电源这一最关键部分;系统软件采用CRC校验码这一差错编码技术,有效提高通信成功率。用双单片机系统构建了一个模拟的空调室内机和室外机平台,将上述抗干扰措施应用于该系统,并用VB语言设计了上位机程序,对通信电路的实际运行情况进行监控。系统在绝缘油耐压仪的强干扰环境下的试验结果表明:改进后的通信电路,抗干扰性增强,容错能力提高,通信成功率有较大提高。更多还原

【Abstract】 Inverter air conditioner can save electricity, reduce the pressure on the power supply, and stimulate the development of other industries. Nowadays, the problems of global energy crisis and environmental issues become more and more important, so its development has tremendous social and economic benefits. The accuracy and real-time property of the communication between indoor and outdoor inverter air conditioner play very important roles for the whole air conditioner system performance. Therefore, the study of inverter air conditioner circuits communication is of great significance on enhancing the successful rate of communication.The thesis first describes the latest international development of the inverter air conditioner in detail, and points out the existing problems of communication. By comparing the advantages and disadvantages of some common communication modes, the current loop used as the communication way of inverter air conditioner has been fully affirmed.Secondly, on this basis, extensive simulation studies have been done to improve the reliability of the communication circuit by using PSPICE software. Through the results of simulation and the theoretical analysis of interference causes, the thesis points out the anti-interference technique of communications system: system hardware has targeted anti-interference design, particularly in the power part, the most crucial part; System software uses Cyclical Redundancy Check (CRC) error coding technology which effectively improve communications successful rate. A simulative air-conditioned indoor and outdoor machine platform is built by SCM system.Thirdly, the system apply the anti-interference techniques, and design procedures for the PC by using VisualBasic (VB) language to control the actual operation situation of communication system.It is shown that the system in the instrument-interference environment of insulating oil compression resistance: anti-interference capacity of improved communication circuits is increased, fault-tolerant capabilities have improved and the successful rate of communications greatly increased.更多还原