微型机与应用
微型機與應用
미형궤여응용
MICROCOMPUTER & ITS APPLICATIONS
2011年
19期
76-77,80
,共3页
LED%占空比%电感%多档位
LED%佔空比%電感%多檔位
LED%점공비%전감%다당위
LED%duty cycle%inductance%multi-position
介绍通过在PWM调光驱动电路中引入电感,达到平均电流的作用。从模拟和实验角度得出了驱动电路中电感大小的确定方法,并深入分析了此驱动电路中LED上电流值和PWM波占空比之间的函数依赖关系。可由计算机通过RS-485对LED亮暗程度实现实时、细致的多档位控制。
介紹通過在PWM調光驅動電路中引入電感,達到平均電流的作用。從模擬和實驗角度得齣瞭驅動電路中電感大小的確定方法,併深入分析瞭此驅動電路中LED上電流值和PWM波佔空比之間的函數依賴關繫。可由計算機通過RS-485對LED亮暗程度實現實時、細緻的多檔位控製。
개소통과재PWM조광구동전로중인입전감,체도평균전류적작용。종모의화실험각도득출료구동전로중전감대소적학정방법,병심입분석료차구동전로중LED상전류치화PWM파점공비지간적함수의뢰관계。가유계산궤통과RS-485대LED량암정도실현실시、세치적다당위공제。
This paper introduces driving circuit of digital dimmer which using inductance to smooth the current,and how to get the inductance's size from simulation and experiment, also analyzes the fuction between the current of LED and the duty cycle of PWM, at last uses the computer changes the degree of LED real-timly by RS--485 to achive control of multi-position selective swtich.