一种用于开关电源的新型模拟调光电路  

A New Analog Dimming Circuit Used in Switching Power Supply

作　　者：冯玲玲[1] 周英娜 郭宝明[1] 李威[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,成都610054

出　　处：《光电子技术》2015年第2期123-125,共3页Optoelectronic Technology

摘　　要：设计了一种用于LED驱动电源的模拟调光电路。该调光电路由外部控制产生一个占空比可调的振荡信号来线性改变恒流的基准电压;基准电压的改变会产生对功率管开关信号(PWM)占空比的调节,从而实现LED电源输出电流的线性调节。基于TSMC_0.5μm BCD工艺,用Hspice进行仿真,结果表明:这种线性调光电路能精确控制流过负载LED的电流,实现对LED灯的线性调光。An analog dimming circuit used in LED power supply was designed. An adjustableduty cycle oscillation signal produced by external control could change the reference voltage which determined the duty cycle of PWM, and thus adjusted the output current of LED power supply linearly. Based on TSMC_ 0.5μm BCD process, it is shown by Hspice simulation that the current of load can be accurately controlled with the linear dimming circuit and the linear dimming LED lights achived.

关 键 词：线性调光 发光二极管驱动电源 可调占空比 振荡器 

分 类 号：TN433[电子电信—微电子学与固体电子学]