1、 1 毕业设计(论文)毕业设计(论文) 题题 目:目: 快热式家用电热水器的设计快热式家用电热水器的设计 系系 部:部: 电子信息系电子信息系 专专 业:业: 应用电子技术应用电子技术 学学 号:号: 学生姓名:学生姓名: 指导教师:指导教师: 职职 称:称: 高级工程师高级工程师 2013 2013 年年 04 04 月月 05 05 日日 2 摘摘 要要 随着生活节奏的加快,快热式电热水器省时的特性越来越被生活忙碌的人群 所认可。随着用电环境的改善,不少新建楼房都可以安装即快热式电热水器,这 催生了即热式电热水器的快速增长。 本设计的快热式电热水器系统以单片机为核心,辅以键盘,显示电路,利
2、用 热敏电阻对热水器出口温度进行检测, 将温度转换成频率, 并将其反馈到单片机, 用单片机测出频率大小,从而间接测出温度值,温度/频率转换电路简单可靠, 成本低廉。对于加热功率的控制,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。为 了在关机和超温保护的状态下能可靠地关断加热电源, 电路中加入了继电器来控 制加热电源。其中串联在继电器线圈回路的熔丝为 105时,热保险丝会熔断, 防止加热管干烧。与电热丝并联的 LED 发光管用来指示电热丝的工作状态。 快热式电热水器它体积小,重量轻,要使用热水时,即开即热,无须等待,省去 了加热多
3、余的热水,因此它具有省时、省电、省水的优点。正是基于以上原因, 快热式电热水器在今后有着极为广阔的发展前景。 关键字:单片机 温度 双向可控硅 继电器 Abstract With the pace of life speeds up, Quick hot-water heater in the busy lives of more and more recognized by the crowd. With electricity the improvement of the environment, many new buildings that can be installed faste
4、r heat-type heaters, which hastened the birth of hot-water heater that is the rapid growth. The design of the fast heat of the water heater system to SCM as the Supplemented by keyboard supplemented by the keyboard, display circuit, the use of thermal resistance of the water heater temperature detec
5、tion exports, the temperature will be converted to frequency, and feedback to the microcontrolle, with SCM size measured frequency, thus indirectly measured temperature and temperature / frequency conversion circuit is simple and reliable, low cost. The heating power of control, the paper adopted a
6、two-way SCR control, SCM through Optocoupler SCR trigger signal to the control of the SCR on-angle and thus control the effective electric wire heating power. In order to shut down and over-temperature protection of the state can be reliably heated power shutdown, joined the circuit in the relay to control the heating power. One series in the relay coil circuit for the fuse 105 , the fuse will be hot links to prevent the heati