脉冲宽度调变在智能LED灯灰度调节中的研究

THE RESEARCH OF PWM IN GRAY LEVEL ADJUSTMENT OF THE INTELLIGENT LED LIGHT

针对脉冲宽度调变(PWM)技术在LED灯灰度调节中的应用,提出一种可用于调节LED灯灰度的调光电路的解决方案。实验结果是通过改变蓝牙芯片的各个IO端口产生的PWM方波的占空比,来实现对调光电路中流过LED灯珠电流的调节,进而实现对LED灯的灰度调节。由此设计并研究出一套完整可行的调光电路系统。

Using pulse width modulation technology in the LED light gray level adjustment,a solution of a kind of dimming circuit which can be applied to adjust the gray level of the intelligent LED light is proposed. The experiments result show that the main function of this dimming circuit is to adjust the current flowing through the LED balls by changing the duty ratio of the square wave produced by every IO port of the Bluetooth chip and then realize gray level adjustment to the LED light. The conclusion is to work out a set of complete feasible dimming circuit system.