LED灯峰值恒流控制的方法  

Way of Peak Constant Current Control for LED

作　　者：周登荣[1] 李国云[2] 蒲红梅[1] 

机构地区：[1]攀枝花学院电气信息工程学院,四川攀枝花617000 [2]攀枝花学院机电工程学院,四川攀枝花617000

出　　处：《电测与仪表》2013年第8期112-115,共4页Electrical Measurement & Instrumentation

基　　金：四川省教育厅资助科研项目(11ZA25B)

摘　　要：分析了LED灯的工作特点。为了提高整个LED驱动器的可靠性,对Buck电路峰值电流控制进行了分析。详细介绍了数字峰值电流CCM情况下的后缘调制原理,理论推导出电感电流在此工作情况下的Buck电路占空比的数学公式,仿真分析了后缘调制下的开关管的PWM波形及LED灯的电流波形。仿真分析可知,该调制下的LED灯电流波形输出恒定,纹波小。最后通过实验验证了LED灯恒流控制方法的可行性和可靠性。When introducing the working characteristics of LED lamp, this paper analyzes the Buck circuit peak current control in order to improve the reliability of the LED driver. In the condition of the figure peak current CCM the paper also introduces the trailing edge modulation principle in detail, and deduces Buck circuit duty cycle mathematical formula in this work condition of inductor current.The simulation analyzes the trailing edge modulation waveform of the PWM switch and LED lamp current waveform, which shows that the modulation of the LED light output constant current waveform and ripple. In the end, it verifies the feasibility and reliability of the constant current control LED lights by experiments.

关 键 词：LED灯 BUCK 峰值电流控制 CCM DPC后缘调制 

分 类 号：TM45[电气工程—电器]