摘要
采用大功率LED做点光源,用专用的LED控制芯片代替单片机电路,设计了一种光源可调的微型闭环控制系统。该系统通过光电接收放大电路将光电流采样成电压放大后反馈给控制驱动电路,控制驱动电路根据此电压信号调整输出给LED两端的电压,从而控制光源的稳定性。
A kid of subminiature closed-loop control system of adjustable light source was designed. High-power led was applied as dot light source and special led control chip was applied in place of complicated MCU circuit. After the circuit＇s sampiing the current and magnifying the voltage to feed back, control and drive circuit adjusted the voltage to led according to the voltage feedback, and thus it can control the stability of the light source. Practical project results show that the control system can fit the control need.
出处
《电子技术应用》
北大核心
2011年第3期42-43,47,共3页
Application of Electronic Technique
关键词
大功率LED
PT4105
光源稳定
光源控制
照度
high power LED
PT4105
stability of light source
light source control
illuminance
