快热式家用电热水器毕业论文.doc

杭州电子科技大学本科毕业设计 诚 信 承 诺 我谨在此承诺：本人所写的毕业论文《快热式家用电热水器的设计》均系本人独立完成，没有抄袭行为，凡涉及其他作者的观点和材料，均作了注释，若有不实，后果由本人承担。 承诺人（签名）： 2010 年 5月 31 日  摘 要 本毕业设计主要通过温度传感器采集水温、可控硅调节水温，从而实现快热式电热水器工作的整个过程。文中首先对温度采集技术进行了简单的介绍，然后对51单片机进行了系统的概述。接着，又对设计过程中所采用的技术和方法进行了阐述，并对温度采集与控制过程中的多种方法进行了比较，确定了最后的方案。 在硬件部分中，根据本课题的需要，本文采用P89V51单片机及DS18B20芯片来测量与控制温度，并介绍了这两款芯片的内部结构和主要特征，对芯片的工作原理和控制方式进行了阐述。同时本文采用了双向可控硅控制，单片机通过光耦给可控硅触发信号，控制可控硅的导通角，从而控制电热丝的有效加热功率。 在软件部分中，本文给出了对数据进行处理的流程图。随着系统最终调试成功,本文最后部分对该系统的性能进行了测试和分析。实验表明，所研制的基于DS18B20的快热式家用电热水器性能稳定、工作可靠，所具有的功能达到了课题原先的功能要求。 关键词：温度采集；P89V51单片机；双向可控硅；光耦 ；脉宽调制 ABSTRACT This graduation designs to mainly measure water temperature by the temperature sensor,control water temperature by SCR,then realize the whole instant water heater system. In text, it makes a simple introduction of technology of several temperature signal first of all, then, introduces 51-MCU systemicly. And then, it introduces method and technology used in the process of designing. At the same time, it compares with each other method in the measure and control water temperature of designing, at last, it decides the project. In the part of hardware, basing on the need of the task, it makes use of the P89V51 and DS18B20 to measure and control the temperature, as well, this text is detailed to introduce the internal structure and main characteristics of the two chip and carrying on elaborating to the work principle.The heating pipe is controlled by the TRIAC,the SCM give a trigger signal to TRIAC through the optocoupler,and control the conduction angle of the TRIAC, then control the effective heating power of the heating wire. In the part of software, it shows the flow chart of processing datas. Along with the system is debugde successfully, this text part carries on the test and analysis to the function of that system in the end. The experiment express that what is done is provided with function stability and work credibility, the function have r