电测与仪表
電測與儀錶
전측여의표
ELECTRICAL MEASUREMENT & INSTRUMENTATION
2013年
7期
109-112
,共4页
LED灯%Buck变换器%数字峰值电流控制%瞬态特性
LED燈%Buck變換器%數字峰值電流控製%瞬態特性
LED등%Buck변환기%수자봉치전류공제%순태특성
LED Lamp%Buck converter%digital peak current control%transient characteristic
对数字LED的峰值电流控制方法进行了分析和研究,并以Buck变换器拓扑结构作为研究对象,理论分析了Buck电路的峰值电流前缘和后缘数字控制方法,仿真分析比较这两种控制方法优缺点。仿真结果表明,前缘调制比后缘调制有更快的瞬态响应速度和更小的电压跌落和过冲。最后实验揭示了前缘控制方法的瞬态特性。本文提出的LED灯峰值电流前缘控制方法对LED启动时的冲击电流起到抑制作用,对电网电压波动带来的不利因素也起到一定的稳压保护作用,提高了LED的发光率和使用寿命。
對數字LED的峰值電流控製方法進行瞭分析和研究,併以Buck變換器拓撲結構作為研究對象,理論分析瞭Buck電路的峰值電流前緣和後緣數字控製方法,倣真分析比較這兩種控製方法優缺點。倣真結果錶明,前緣調製比後緣調製有更快的瞬態響應速度和更小的電壓跌落和過遲。最後實驗揭示瞭前緣控製方法的瞬態特性。本文提齣的LED燈峰值電流前緣控製方法對LED啟動時的遲擊電流起到抑製作用,對電網電壓波動帶來的不利因素也起到一定的穩壓保護作用,提高瞭LED的髮光率和使用壽命。
대수자LED적봉치전류공제방법진행료분석화연구,병이Buck변환기탁복결구작위연구대상,이론분석료Buck전로적봉치전류전연화후연수자공제방법,방진분석비교저량충공제방법우결점。방진결과표명,전연조제비후연조제유경쾌적순태향응속도화경소적전압질락화과충。최후실험게시료전연공제방법적순태특성。본문제출적LED등봉치전류전연공제방법대LED계동시적충격전류기도억제작용,대전망전압파동대래적불리인소야기도일정적은압보호작용,제고료LED적발광솔화사용수명。
Taking Buck converter topology for the research object, this paper studies digital LED peak current control methods, and analyzes the digital control method to peak current leading and trailing edge in the Buck circuit with comparing the advantages and disadvantages of these two control methods by stimulating. The simulation results show that the leading edge modulation has faster transient response speed, and smaller voltage drop and overshoot than that of the trailing edge modulation. Eventually, the experiment shows the transient characteristics of leading edge control method to which peak current of the LED lights given in this study has an inhibitory effect on the inrush current when LED lights switches on, and also plays a protective role to stabilize the fluctuating voltage, therefore, it improves the luminous efficiency and service life of LED lights.