带电感的PWM调光方法  

Method of PWM dimmer with inductance

作　　者：张光华[1] 唐臻宇[1] 

机构地区：[1]四川大学,四川成都641400

出　　处：《微型机与应用》2011年第19期76-77,80,共3页Microcomputer & Its Applications

摘　　要：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。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.

关 键 词：LED 占空比 电感 多档位 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]