基于改进滑模控制策略的汽车LED前照灯驱动器设计

Design of automobile LED headlamp driver based on improved sliding mode control strategy

为了实现汽车LED前照灯远近光光照度和色温的无极调节,提出一种基于改进滑模控制策略的新型LED前照灯驱动器设计方案。采用4路独立控制的Boost变换器作为主电路拓扑,分别控制近光暖光、近光冷光、远光暖光、远光冷光灯组,构建了该电路拓扑的数学模型,并提出了一种新型复合滑模控制策略。在此基础上进行了软硬件设计,研制了一台36 W的试验样机,对该控制策略进行了试验验证。结果表明:基于提出的新型基准占空比调制的复合滑模控制策略设计的LED前照灯驱动器可分别通过设置参考电流值和色温给定系数无极调节LED灯的光照度和色温;近光冷、暖LED的输出电压纹波约为1 V,响应时间仅约为0.1 s,系统输出稳定、响应速度快、切换流畅。研究结果可为汽车LED前照灯的自动化设计提供参考。

In order to realize the stepless adjustment of the high and low beam illumination and color temperature of automobile LED headlamps,a new LED headlamp driver design scheme based on an enhanced sliding mode control strategy was proposed.The main circuit topology adopt a four-channel independent Boost converter to control the low beam warm light,low beam cold light,high beam warm light and high beam cold light,respectively.A mathematical model of the circuit topology was constructed,and a new composite sliding mode control strategy was proposed.On this basis,the software and hardware designs were carried out,and a 36 W test prototype was developed to verify the control strategy through experiments.The results show that the LED headlamp driver based on the proposed composite sliding mode control strategy of the new reference duty cycle modulation can adjust the illumination and color temperature of the LED headlamp by setting the reference current value and the color temperature given coefficient,respectively.The output voltage ripple of the low beam cold and warm LED is about 1 V,and the response time is only about 0.1 s.The system has stable output,fast response speed and smooth switching.The research results can provide reference for the automation design of automobile LED headlamp.