Design of High-Stability Driver for White LED

Yin-guo Huang, Yu-chi Lin, W. Wang, Guimei Dong
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引用次数: 7

Abstract

The driving technology is a very important factor influencing the output performances of white LED (WLED).This paper proposes a kind of high-stability driver for WLED based on constant-current and constant-luminance. The working characteristics of WLED and the principle of driving WLED are introduced in this paper. The newly designed driver works in a mode of constant current LDO and it is feedback controlled by the output of WLED to obtain highly stable luminance. Finally, a test circuit is set up to validate the proposed scheme and some experiments are carried out. The results show that the driving current maintains nearly constant and the luminance of WLED is of high accuracy. Keywords-white LED; driver; constant-current; constantluminance
白光LED高稳定驱动设计
驱动技术是影响白光LED输出性能的重要因素。提出了一种基于恒流恒亮度的高稳定性WLED驱动电路。本文介绍了WLED的工作特性和驱动WLED的原理。新设计的驱动器工作在恒流LDO模式下,由WLED输出反馈控制,以获得高度稳定的亮度。最后,搭建了测试电路对所提出的方案进行了验证,并进行了实验。结果表明,驱动电流基本保持恒定,led的亮度精度较高。Keywords-white领导;驱动程序;恒流;constantluminance
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