光电子技术, 2015, 35 (2): 123, 网络出版: 2015-09-08
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
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。
Abstract
An analog dimming circuit used in LED power supply was designed. An adjustable duty 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.
冯玲玲, 周英娜, 郭宝明, 李威. 一种用于开关电源的新型模拟调光电路[J]. 光电子技术, 2015, 35(2): 123. FENG Lingling, ZHOU Yingna, Guo Baoming, LI Wei. A New Analog Dimming Circuit Used in Switching Power Supply[J]. Optoelectronic Technology, 2015, 35(2): 123.
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