步进式数控LED亮度控制电路设计  

Design of step type digital control LED brightness control circuit

作　　者：李金生[1] 程立松[1] 

机构地区：[1]上饶职业技术学院,江西上饶334109

出　　处：《无线互联科技》2016年第23期66-67,共2页Wireless Internet Technology

摘　　要：文章介绍了一种通过PWM信号控制LED亮度的电路,其能实现0~9十级步进式均匀亮度控制,同时可在数码管上显示当前亮度级数,级数越大亮度越高。PWM信号控制不改变流过高亮LED的瞬时电流,而只改变其平均电流,可大大提高LED的使用寿命,同时LED亮度的均匀变化可有效保护人的视力。A kind of circuit through the PWM signal to control LED＇ s brightness is introduced in this paper, which can achieve 0-9 ten- series marching type uniform brightness control, and displays the current brightness series in the digital tube, the greater the series, the higher the brightness of PWM series signal control does not change the instantaneous current flowing through the light LED, and change the average current, which can greatly improve the LED the service life, and even change the brightness of LED can effectively protect people＇s eyes.

关 键 词：PWM信号 步进式 亮度级数 

分 类 号：TM923.34[电气工程—电力电子与电力传动]