三基色大功率白光LED色度稳定性的研究

三基色合成白光技术由于可以获得良好的显色指数、较宽的色温范围、以及多种多样的色彩变换能力而得到了广泛应用。对于三基色大功率白光LED,由于其发热量较大,故实现色度稳定的难度相对较大,特别是要实现亮度可调的同时,色度保持稳定就更加困难。现采用三基色合成白光技术实现大功率白光LED,通过设计制作驱动补偿电路进行色度稳定性的反馈控制。结果表明,采用三基色合成白光技术制作的大功率白光LED,设计合适的反馈控制驱动电路,其色度可以达到很好的稳定性,色差可以稳定在0.002以内。即使是在连续调整亮度的条件下,加入反馈控制后,合成白光的色差也可以稳定在0.01以内。

Research on chroma stability in high power white LED with tricolor compound

Tricolor compound white light technique is used extensively because of its well color rendering index,broader range of color temperature and stronger color switch ability.Because of tricolor high power white LED′s heavy radiation,it′s difficult to steady the chroma of white light,especially adjust the luminance of white light at the same time.In this paper,we use tricolor compound white light technique to make high power white LED,and design appropriate feedback control drive circuit to steady the chroma of white light.As a result,the chroma stability of the system is very exciting,it has a color error of less than 0.002,and even when adjusting the luminance continuously,it also achieve with a color error of less than 0.01.