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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。
Due to its low cost, long life and small volume, white light is rapidly becoming the choice of illumination and backlight, and the research of its driving circuit has drawn much attention. LED dimming method can be divided into two kinds: analog dimming and PWM dimming. The disadvantage of using analog dimming technology is: with the forward current changes will produce color cast, and PWM dimming by turning the LED on and off to change the forward current on time to achieve the effect of brightness adjustment. This article will explain how to use PWM to adjust the brightness, designed for LED lighting applications, driving circuit, the use of good lighting achieved.