《红外线自动干手器电路设计》-毕业论文.doc

成绩 山东理工大学 电气与电子工程学院 课程设计说明书 设计题目： 专业班级： 学生姓名： 学 号： 指导教师： 起止日期： 摘 要 自动干手机是一种高档卫生洁具，广泛应用于宾馆酒店、机场车站、体育场馆等公共场所的洗手间。其工作原理是采用一种红外线控制的电子开关，当有人手伸过来时，红外线开关将电热吹风机自动打开，人离开时又自动将吹风机关闭。 自动干手电路是由红外线发射电路，红外线接收电路，时间延迟电路，吹风机开关电路和电源电路五部分构成的。 在红外线发射电路中，输出电路端Q产生脉冲信号来控制红外线发光二极管发射光脉冲，二极管D1起保护红外发光二极管的作用。 在时间延迟和吹风机开关电路中，当输出端Q输出低电平时，三极管截止，无电流通过。继电器与三极管集电极相连，当有电流驱动时，开关吸合，电磁阀通电，电路闭合，吹风机吹出热风；当无电流驱动时，开关断开，电磁阀不通电，电路断开，吹风机不吹出热风。同时在继电器两端并联一个二极管实现保护，在电路中加入发光二极管D3作为显示电路，显示吹风机是否启动。 关键字: 红外线发射电路 红外线接收放大电路 吹风机开关控制电路 时间延迟电路 电源电路 ABSTRACT Automatic dry cell phone is a kind of high-grade sanitary ware, widely used in hotels, airport station, sports stadiums and other public places of the bathroom. The working principle of adopting a infrared control of electronic switch, when a hand stretch to come over, infrared switch will electric blower automatically open, the man left and automatic will blower closed. Automatic circuit is dry hands by infrared emission circuit, infrared receiver circuits, time delay circuit, hair dryer switch circuit and power circuit composed of five parts. In the infrared emission circuit, the output power LuDuan Q produce the pulse signal to control the infrared emitting diode launch a light pulse, diode D1 infrared leds on protection of the role. In the time delay and hair dryer switch circuit, when the output low electricity output Q at ordinary times, the transistor, no current through the. Relay and triode connected to the collector, when a current drivers, switch suck close, electromagnetic valve electricity, closed circuit, blower, the hot air; When no current drivers, switch, solenoid valves no electricity, circuit disconnect, hair dryer dont blow hot air out. At the same time in the relay ends a diode in parallel to realize protection, in a circuit to join leds D3 as show circuit, show hair dryer is active Key word: infrared emiss