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课程设计任务书学生姓名：______________专业班级：______电信09________指导教师：____刘运苟____工作单位：____信息工程学院____题目：家电延时保护器初始条件：具备模拟电子电路的理论知识；具备模拟电路基本电路的设计能力；具备模拟电路的基本调试手段；自选相关电子器件；可以使用实验室仪器调试。要求完成的主要任务：（包括课程设计工作量及其技术要求，以及说明书撰写等具体要求）1、输入电压198～240v时，给负载正常供电，显示2、输入电压Vi<198v，及Vi>242v时，对负载断电，并作高低超压显示3、电压恢复正常后，延时5秒，恢复供电4、25w灯泡作负载5、安装调试并完成符合学校要求的设计说明书6、设计电源；7、焊接：采用实验板完成，不得使用面包板。时间安排：十八周一周，其中3天硬件设计，2天硬件调试指导教师签名：年月日系主任（或责任教师）签名：年月日目录摘要································································1课题的提出依据和意义············································12本课题的主要任务和研究内容······································12.1本课题的主要任务···········································12.2本课题研究的主要内容·······································23电路组成和工作原理··············································33.1直流稳压电流部分···········································43.2延时电路···················································44电路元器件的选择与计算··········································64.1定时器IC的选择············································64.2电压取样单元元件选择·······································74.3延时电路元件选择···········································84.4直流稳压电源元器件的选择···································85电路的仿真······················································96设计心得体会···················································13参考文献···························································14摘要随着我国人们生活水平的提高，电冰箱已经逐渐成为我国广大居民家庭生活必备的一种家用电器。然而，电冰箱的驱动电机在一定的电压范围内才能正常工作，供电电压过高或过低很容易导致绕组线圈烧毁。因此，电冰箱易损坏或寿命短是困扰人们的一个问题。究其原因，供电电压波动、瞬时断电是电冰箱损坏或寿命缩短的主要原因之一。而对于绝大多数家用电冰箱来说，瞬时断电与电压波动几乎是不可避免的。为此，我们利用变压器，再配以控制电路设计了一种自动稳压、自动延时的电冰箱保护器，该多功能电冰箱保护器能够根据负载电流判断线路中的各种故障并及时进行保护，最大限度的降低对人们日常生活的影响，是一种经济实用的电冰箱保护器。电冰箱延时保护器，它可以在电冰箱起动过程中，在突然停电后，又立即恢复供电的情况下自动延时3～8分种，从而使电冰箱毛细管进、出二端的压差得到消除，防止冰箱电动机因过载起动或其他部件因过载起动而造成的损坏，有效地保证电冰箱的正常使用。本实用新型由直流电源...