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高调光比新型汽车日行灯HB LED光源驱动器

摘要：高亮度LED用于汽车大灯是未来的发展方向，其中HB LED日行灯已开始作为产品应用于一些高档轿车。本文设计了一款基于专用IC MAX16831与反激式变换器的汽车日行灯HB LED驱动电路，实现了HB LED的恒流驱动和PWM调光，并能满足日行灯的有关驱动要求。详细介绍了线路的设计原理，并对PWM调光控制功能和调光比影响因素等进行了分析，给出主要实验参数和实验结果，输入电压6V～19V，输出电压40V～57V，PWM调光占空比可调5％－100％，输出LED电流160mA，有关实验验证了所给出设计的可行性。 叙词：高亮度LED MAX16831 恒流 PWM调光 调光比 Abstract：Applying high brightness LED to car lamps is future trend of this industry, and even now HB LED daytime running lamps(DRLs) have been installed in some high-end cars. This article designs an automobile DRL HB LED driving circuit based on the use of IC MAX16831 and flyback convertor, which realizes constant-current drive and PWM dimming and in the meantime can meet related driving requirements of DRLs. The author introduces in detail the principles of designing the circuit, analyzes some factors such as the function of PWM dimming control and the influence of dimming ratio, and finally, presents major experimental parameters and results as follows: input voltage 6V to 19V, output voltage 40V to 57V, PWM dimming adjustable duty cycle 5% to 100%, and LED output current 160mA. Related experiments demonstrates that the design is applicable. Keyword：High Brightness LED, MAX16831, Constant Current, PWM Dimming, Dimming Ratio

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