Luminous Flux and CCT Stabilization of White LED Device With a Bilevel Driver

IEEE Photonics Journal

Shuo Lin¹  Huanting Chen¹  Xiaofang Zhou¹  Jinhai Liu¹ 

[1] College of Physics and Information Engineering, Minnan Normal University, Zhangzhou, China;

关键词: Lighting system;    bi-level driving;    optical and color control;    light-emitting diode (LED);    correlated color temperature (CCT);    luminous flux.;   

DOI  :  10.1109/JPHOT.2018.2793965

来源: DOAJ

【 摘 要 】

The optical, color, electrical, and thermal properties of an LED devices are highly dependent on one another. The luminous flux variation and correlated color temperature (CCT) shifting of white LED sources is attributed to luminous efficacy and emission spectrum shifting with the electrical power and heat-dissipation power. An analysis model that includes the luminous flux, CCT, electrical power, and junction temperature of the white LED sources with bilevel driver is proposed in this paper. The proposed model can descript that the stablized luminous flux and CCT of the white LED system with bilevel driver is a result of the complex interactions among the given electrical power of bilevel, duty cycle, thermal resistances, junction temperature, and the physical parameters of the LED sources. Reduction variation of CCT and luminous flux of the white LED device with bilevel driver over a dimming range has been practically achieved. The proposed method can be easily adopted for improving the CCT and luminous flux stabilization of the white LED device with a bilevel driver.

【 授权许可】

Unknown