液晶与显示, 2011, 26 (1): 96, 网络出版: 2011-02-21
LED可调光自动控制系统设计
Design of Adjustable Brightness LED Automatic Controllable System
LED亮度 恒流驱动 数字可调 单片机 LED LED LED’s brightness constant current drive adjustable number single chip computer
摘要
基于低功耗MSP430单片机的特点，提出一个用数字化恒流源来控制LED 灯光可调的设计思路。在规定时间内，系统通过对背景光和人体红外信号检测，选择LED需求的亮度，单片机将输出电压数字写入D/A转换器，将D/A输出的电压作为恒流源的输入电压，间接地控制功率管的基极电压使功率管输出不同的电流，实现LED亮度数字可调，从而完成对LED光强度的智能控制。
Abstract
Based on the characteristics of low-power MSP430 MCU, the paper proposes an idea that constant current source control the brightness of LED. In a specified time, MCU selects the brightness of LED’s demand by collecting the background light and detecting the infrared signal of human, writes the number of output voltage in D/A converter. And the output voltage by D/A is the input voltage of constant current source which control the voltage of transistor base pole indirectly and lets it produce different output current value. Then the system can accomplish adjustable brightness of LED through the number and finally complete LED’s light intensity of intelligent control.
李渊, 李宝营, 穆艳. LED可调光自动控制系统设计[J]. 液晶与显示, 2011, 26(1): 96. LI Yuan, LI Bao-ying, MU Yan. Design of Adjustable Brightness LED Automatic Controllable System[J]. Chinese Journal of Liquid Crystals and Displays, 2011, 26(1): 96.
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