电子课程设计报告 定时关断插座VIP免费

河海大学计算机及信息工程学院（常州）课程设计报告题目定时关断插座专业、学号授课班号学生姓名指导教师完成时间摘要本次课设是通过设计一个定时开关，预置一个时间，通过计数器倒计时方式进行计数。当定时未结束时，发出信号“1”，主电路接通，电器的工作；当定时结束后，发出信号“0”，主电路断开，电器的不工作。由555组成秒脉冲发生器[2]，由74192构成倒计时的计时器，由7448驱动数码管显示当前的时间，由继电器控制插座关断，并且由LM339构成的电压比较器实现电路保护。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，逐渐解决了实践中出现的各种问题，达到了设计要求，实现了功能。课程设计实践促进了对数字电路知识的理解；了解了理论和实际相结合的道理，体会到理论与实际的联系与区别；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、74LS192、74LS48、数码管、过压欠压目录前言······························································1第一章设计内容及要求··········································2第二章系统设计方案论证与选择2.1系统组成·····················································32.2设计方案····················································32.3方案论证与选择·············································6第三章单元电路设计3.1秒脉冲发生电路··············································73.2计数器······················································93.3译码显示电路···············································113.4过压和欠压保护电路·········································143.5主电路·····················································19第四章实验、调试及调试现象与分析····························21结论······························································23参考文献·························································24附录一系统PROTEL原理图·······································25附录二系统PCB原理图···········································26附录三系统实物图···············································27前言现今市场上出售的国内外各种品牌的电饭煲、电炒锅、电磁炉等，其控器部分都是和煲体连在一起使用的，它虽体积小，方便好用[1]，却有一个致命的缺点，就是易烧毁，并且由于设计上的不足，毫无修复的意义，成本高不算，功率大，电流强，更易烧毁，同时还有漏电等不安全因素。为实现节省能源和增加使用寿命的目的，通过定时关断插座的使用可以减少不必要的用电时间，也可以避免忘关电器电源从而杜绝安全隐患，同时实现了对电器通电时间的科学管理，大幅提高各种电器的使用寿命。同样，工业生产中许多地方都需要对电器设备进行自动控制，这样数字式定时关断插座便显得特别重要。本定时关断插座设计以继电器和时间定时控制器串并在电器电路上，启动时间控制器、电磁线匝动作，吸动继电器中间断开的双向触点接通，便可实现...