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1、毕业设计（论文）题目：快热式家用电热水器的设计摘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
2、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AbstractWiththepaceoflifespeedsup,Quickhot-waterheaterinthebusylivesofmoreandmorerecognizedby
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