CAJ | 학술논문

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。
분석료LED등적공작특점。위료제고정개LED구동기적가고성，대Buck전로봉치전류공제진행료분석。상세개소료수자봉치전류CCM정황하적후연조제원리，이론추도출전감전류재차공작정황하적Buck전로점공비적수학공식，방진분석료후연조제하적개관관적PWM파형급LED등적전류파형。방진분석가지，해조제하적LED등전류파형수출항정，문파소。최후통과실험험증료LED등항류공제방법적가행성화가고성。
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.