发光二极管
脉冲宽度调制
波形
电流(流体)
功率(物理)
计算机科学
灵活性(工程)
LED电路
电子工程
非线性系统
调制(音乐)
控制理论(社会学)
物理
工程类
电压
数学
电气工程
声学
人工智能
控制(管理)
统计
量子力学
短路
作者
K. H. Loo,Wai-Keung Lun,Tang Xiao,Y. M. Lai,Chi K. Tse
标识
DOI:10.1109/tpel.2009.2021183
摘要
LEDs must be externally driven by power sources to emit light. One problem associated with driving LEDs is its inherent nonlinear relation between the emission intensity and the forward current. Thus, the light output obtained from an LED is strongly dependent on the actual current waveforms employed to drive it. It is found that driving an LED with dc produces light output that surpasses all other techniques including the commonly used pulse-width modulation (PWM) technique. On the other hand, for dimming function, it is found that the PWM technique offers greater dimming flexibility in comparison to dc technique. In this paper, a generalized methodology for driving LEDs inheriting the features of both of these techniques is proposed. It employs a pulsating current switching between two discrete current levels, where the current levels and their durations can be concurrently varied for a more precise mapping of the driving conditions to the light output. The existing dc and PWM techniques can be viewed alternatively as being special cases of this more general approach.
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