数字式定时开关.pdf

电子课程设计报告题目名称：数字式定时开关姓名：段亚斌专业：电子信息工程班级学号：088208108同组人：李巨元指导教师：程宜凡老师摘要①简述设计思路：本次课设是设计一个定时开关，通过拨码开关预置一个时间，通过计数器倒计时方式进行计数，当到达某一个时间时，发出一个信号，进而来控制电器的工作。我们此次的实验是当倒计时到0是，一直停留在在0，并且不断发出蜂鸣警报。而且实现远程继电器的控制，用以控制交流家庭220V电器。②简述设计原理：由555组成秒脉冲发生器，由CD40192构成一个倒计时的计时器，由一个共阴LED显示当前的时间，由一个拨码开关（如下图）预设时间，由蜂鸣器组成报警电路，当计数为零时，蜂鸣器发出报警声音。③简述设计过程：设计电路由这几个功能模块组成，在这个设计思想的指导下，运用所学的数字电路的知识，并查阅相关的资料，逐渐解决了了实践中出现的各种问题，达到了设计要求，实现了功能。④简述设计感想：课程设计实践促进了对数字电路知识的理解，锻炼了动手能力和独立思考能力，促进了专业知识的学习。关键词：秒脉冲发生器、定时器、BCD码、译码显示、报警电路目录前言······························································1第一章设计内容及要求············································2第二章系统设计方案选择2.1方案一···················································32.2方案二···················································4第三章系统组成及工作原理3.1系统组成··················································53.2工作原理··················································5第四章单元电路设计、参数计算、器件选择4.1控制电路···················································64.2秒脉冲发生电路·············································64.3计数器·····················································74.4译码显示电路···············································84.5报警电路···················································10第五章实验、调试及测试结果与分析································11结论······························································12参考文献··························································12附录一····························································13附录二····························································14前言随着电子技术的发展,特别是新型集成电路、分立元件的不断投入市场，使得人们对电子技术应用的关注程度已大大超过了电子技术本身。由于集成电路技术的诸多优点。如省电,计时准确,性能稳定，价格低廉等。在计时,自动报时及自动控制等领域发挥着重要的作用,在人们的日常生也愈加离不开数字化的各种生活用品，电子技术深入到社会生活的各个角落。工业生产中许多地方都需要对电器设备进行自动控制，这样数字式定时开关便显得特别重要。具有很高的实用价值，像现在的一些家电如全自动洗衣机、空调等都需要实现开关定时控制这样的功能。还有一些设备如果在设计时加上数字定时技术便会更加提高设备的性能，使之更加自动化、智能化。数字电子技术是一门实践性和应用性都很强的课程，因此在学习课程理论知识的同时，应重视和加强实践训练，要注重对技术应用能力的培养，使理论和实践紧密结合，融为一体，通过本次课程设计还学到了分析、查寻、和排除故障的方法。1第一章设计内容及要求课程设计要求基本要求设计并制作一数字定时开关，此开关采用BCD拨盘预置开关时间。其最大定时时间为9秒，计数时采用倒计时的方式并通过一位LED数码管显示。此开关预置时间以后通过另一个按钮控制并进行倒计时，当时间显示为0时