Design of smart light source based on bi-color LED with single duty cycle for correlated color temperature adjustment

被引：3

作者：

Qiao, Lingyuan ^{[1
]}

Zhang, Huanyue ^{[2
]}

Yu, Jingjie ^{[1
]}

Cao, Fan ^{[1
]}

Gao, Yingming ^{[1
,2
]}

机构：

[1] Dalian Polytech Univ, Dept Informat Sci & Engn, 1 Chigong Yuan, Dalian 116034, Peoples R China

[2] Dalian Univ Technol, Instrumental Anal & Res Ctr, 2 Linggong Rd, Dalian 116024, Peoples R China

来源：

OPTICAL AND QUANTUM ELECTRONICS | 2021年 / 53卷 / 11期

关键词：

LED; CCT; Pulse width modulation; Duty cycle; GREEN; RED; ILLUMINANCE;

D O I：

10.1007/s11082-021-03227-w

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Color-adjustable light sources facilitate both mood lighting and daylight harvesting. A single duty cycle can be used by a bi-color LED to adjust the correlated color temperature (CCT) by associating it with the duty cycle of the pulse width modulation dimming signal of the cool and warm white LEDs. The one-to-one mapping relationship between the single duty cycle and the CCT is based on the color mixing theory of bi-color LEDs. A method to correlate the dimming signals for bi-color LEDs is presented. The influence of the time characteristics of the two basic signals on dimming and CCT adjustment is analyzed. The dimming system of bi-color LEDs is designed, and the method used to adjust the CCT with a single duty cycle is verified. The experiment showed that the CCT can be accurately adjusted by the proposed method.

引用

页数：16

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