照明工程学报
照明工程學報
조명공정학보
CHINA ILLUMINATING ENGINEERING JOURNAL
2014年
3期
74-79
,共6页
LED%脉冲驱动%发光效率%占空比
LED%脈遲驅動%髮光效率%佔空比
LED%맥충구동%발광효솔%점공비
LED%pulse drive%luminous efficacy%duty ratio
通过实验对LED脉冲电流驱动与发光效率之间的关系进行了研究,得出了脉冲电流的幅度、占空比、频率、波形形式对LED发光效率产生的影响。高峰值低占空比的脉冲电流对LED的发光效率的影响较为明显;驱动频率在200~2000 Hz范围内的脉冲电流可以使LED有相对较高的发光效率;额定峰值低占空比的脉冲电流,可使LED的发光效率得到一定的提高;脉冲电流的纹波系数越小, LED的发光效率越高;相比较三角波、正弦波、方波三种脉冲波形,三角波驱动发光效率较高。
通過實驗對LED脈遲電流驅動與髮光效率之間的關繫進行瞭研究,得齣瞭脈遲電流的幅度、佔空比、頻率、波形形式對LED髮光效率產生的影響。高峰值低佔空比的脈遲電流對LED的髮光效率的影響較為明顯;驅動頻率在200~2000 Hz範圍內的脈遲電流可以使LED有相對較高的髮光效率;額定峰值低佔空比的脈遲電流,可使LED的髮光效率得到一定的提高;脈遲電流的紋波繫數越小, LED的髮光效率越高;相比較三角波、正絃波、方波三種脈遲波形,三角波驅動髮光效率較高。
통과실험대LED맥충전류구동여발광효솔지간적관계진행료연구,득출료맥충전류적폭도、점공비、빈솔、파형형식대LED발광효솔산생적영향。고봉치저점공비적맥충전류대LED적발광효솔적영향교위명현;구동빈솔재200~2000 Hz범위내적맥충전류가이사LED유상대교고적발광효솔;액정봉치저점공비적맥충전류,가사LED적발광효솔득도일정적제고;맥충전류적문파계수월소, LED적발광효솔월고;상비교삼각파、정현파、방파삼충맥충파형,삼각파구동발광효솔교고。
This thesis demonstrates that the amplitude , duty ratio , frequency and waveform of pulse will affect LED luminous efficacy , through research and experiment on the relationship between pulse current drivers and luminous efficacy of white LEDs .The luminous efficacy of LED will be more strongly affected when pulse current is high peak with low duty ratio .LED has relatively higher luminous efficacy when the pulse frequency in the range of 200~2000Hz.LED luminous efficacy will be improved certainly when pulse is rated peak with low duty ratio .The smaller the pulse ripple factor , the higher the LED luminous efficacy is.Compared to triangular wave , sine wave , square wave of pulse waveform , pulse of the triangular wave will produce higher luminous efficacy .