摘要
成人使用的读书床头灯让儿童来使用是很不安全的,设计一个低压、可自动定时关断的儿童专用床头灯,工频变压器提供降压供电,使12V低压灯泡点亮,由晶体管的通断来控制灯泡点亮与否,晶体管的通断由555时基电路配合RC定时电路控制;利用555时基电路实现单稳态触发器功能,通过开启钥匙的关断、再开启供电电源(低压)使555时基电路进入下一个单稳态,从而实现单稳态多谐振荡器的工作特性。
It is not safe for children to use the bedside lamp for reading used by adults.A low-voltage bedside lamp which can be automatically and regularly switched off is designed.The power-frequency transformer provides a voltage-reducing power supply to make the 12V low-voltage bulb turn on.The switch-on of the transistor controls whether the bulb is turned on or not.The switch-off of the transistor is matched by 555 time-base circuit.The monostable flip-flop function is realized by using 555 time-base circuit,and the 555 time-base circuit is brought into the next monostable state by turning on the key and turning on the power supply(low voltage).
作者
崔建国
宁永香
Cui Jianguo;Ning Yongxiang(Shanxi Engineering and Technology College,Yangquan Shanxi 045000,China)
出处
《山西电子技术》
2019年第6期3-4,18,共3页
Shanxi Electronic Technology
