摘要
白光由于所具有的低成本、长寿命和小体积的特性,正在迅速成为照明和背光源的选择,其驱动电路的研究受到广泛关注。LED实现调光功能的方法可分为2种:模拟调光和PWM调光。采用模拟调光技术的缺点是:随着正向电流改变会产生色偏现象,而PWM调光通过开启和关闭LED来改变正向电流导通时间以达到亮度调整的效果。本文将说明如何利用PWM来调整亮度,设计了适合照明应用的LED驱动电路,经使用取得了良好的照明效果。
As a result of the low-cost,long-life characteristics and small size,white light are quickly becoming the source of lighting and backlighting options,and the drive circuit obtains widespread concern.Way of LED realizes dimming function can be divided into two categories： analog dimming and PWM dimming.The drawback of Analog dimming technology is that current changes lead to a color cast phenomenon,but the PWM dimming LED through the opened and closed LED to change the current turn-on time in order to achieve the effect of brightness adjustment.This paper describes how to use PWM to adjust the brightness, and designed LED drive circuit for lighting applications.Applications show that it makes good use of lighting effects.
出处
《电子设计工程》
2010年第2期109-111,共3页
Electronic Design Engineering
