Non-linear Power Division In Visible Light System Based On The Characteristics Of The Human Eyes

Compared with traditional lighting equipment,white LED has the advantages of low power consumption,long life and high conversion efficiency,and has gradually replaced the traditional lighting equipment.But the research of indoor visible light dimming does not take the visual characteristics of human eyes into account,that is the relationship between the sensitivity of human eye and the increase of brightness is nonlinear.Therefore,a power division scheme is proposed in this paper,which is suitable for nonlinear sensitivity of human eyes in visible light system.First of all,the necessity and feasibility of the human visual characteristics in lighting system are considered.Based on the nonlinear characteristics of human eyes,a nonlinear power division model is designed.Then,the principle of VLC model is introduced,and the analysis of the system is considered.Secondly,simulation analysis of human eye's non-linear visual characteristics is introduced.The Weber Fechner's law and Stevens power theorem are analyzed,and the CIE 1976 human eye brightness perception model is simulated.At the same time,the traditional visible light power division and the nonlinear visible light division model are simulated and compared.Furthermore,the traditional linear power division and nonlinear power division are simulated and compared.By comparing the illuminance,for the traditional linear power division scheme,when the power is increased from 50% to 100%,the effective area of illuminance is only increased by 0.4%,which causes a great waste of energy,and the human eye sensitivity increased nonlinearly.For the non-linear power division scheme,when the human eye sensitive is increased from 50% to 100%,the human eye can sense the enhancement of brightness,and the effective area of illumination is significantly increased.Finally,monochromatic warm white light as a healthy light source is proposed.The analysis of the invisible damage caused by blue white high color temperature of LEDs are analyzed.And the CIE international standard model for calculating the intensity of blue light damage is proposed.With the MATLAB calculations,results show that the nonlinear power division model meets the lighting standard: with 100% people's eye feeling brightness,the coverage area of illumination can reach 100% of the room coverage as cold light.Furthermore,the signal-to-noise ratio of the nonlinear power division model is simulated,and the following results are obtained: the effective communication area of the cold light model is 97.42%,while the effective area of the warm light model is reduced to 94.55%,but the use of warm light source completely avoids blue light damage,and the human eye can improve the linear perception brightness.