【摘要】：發(fā)光二極管(LED:Light Emitting Diode)以發(fā)光效率高、壽命長、節(jié)能環(huán)保等優(yōu)點,在建筑、信號照明、背光、顯示、街道、室內(nèi)照明等有著廣泛應(yīng)用。目前,實現(xiàn)白光LED光源在較寬范圍內(nèi)色溫連續(xù)可調(diào),又能在該范圍內(nèi)保持高的顯色性,近年來成為研究的熱點。針對寬色溫范圍內(nèi)高顯色性白光光源缺乏有效合成方法的問題,本文進行了以下研究工作。首先,根據(jù)光混合原理及脈沖寬度調(diào)制(PWM)方法,推導出兩通道和三通道調(diào)光關(guān)系式。兩通道調(diào)光法采用冷白和暖白LED合成白光,實現(xiàn)混合光源色溫在3300K～7500K之內(nèi),偏差小于32K。然而,光源顯色指數(shù)整體上較低,均小于90。三通道調(diào)光法采用了暖白/綠/藍LED合成目標光源,測試結(jié)果表明:色溫在3200K～7600K之間,其最大誤差為1.82%,且顯色指數(shù)在86.5～95.3之內(nèi),較兩通道調(diào)光法有較大提升。其次,針對三通道調(diào)制的光源在低色溫時顯色指數(shù)不夠高的現(xiàn)象,本文在三通道、兩通道調(diào)光法基礎(chǔ)上,根據(jù)由實驗確立的相關(guān)色溫與特定色坐標關(guān)系,提出一種"3+2"調(diào)光方法,通過分別控制紅/綠/藍/暖白(R/G/B/WW)驅(qū)動信號占空比實現(xiàn)白光光源調(diào)制。實驗結(jié)果表明:當混合光源光通量設(shè)置為3001m時,色溫在2900K～7600K范圍內(nèi)連續(xù)可調(diào),色溫偏差為0.56%,混合光源調(diào)節(jié)色溫時光通量的起伏小于2.24%,顯色指數(shù)Ra均在94～96之間,理論與實際偏差為不超過0.1;設(shè)置色溫為5000K,當光通量取值在0～800 1m范圍變化時,光通量偏差小于2%。最后,根據(jù)提出的"3+2"調(diào)光方法和設(shè)計指標,設(shè)計了一種遠程智能調(diào)光控制系統(tǒng)。系統(tǒng)實現(xiàn)如下功能:通過智能手機APP或紅外遙控器,實現(xiàn)光源開關(guān)、顏色變化、光通量調(diào)節(jié)、色溫調(diào)節(jié)、恒光模式及自適應(yīng)模式等,其中,恒光模式采用兩塊NRF24L01模塊進行光照數(shù)據(jù)通信,經(jīng)多次協(xié)調(diào)使環(huán)境光照強度與設(shè)定值趨于一致。本文提出的"3+2"調(diào)光方法,具有計算方法簡單、調(diào)光精度高、易于硬件實現(xiàn)等特點。同時,構(gòu)建的這套光控系統(tǒng)不僅能實現(xiàn)類太陽光的光照環(huán)境,也能對舞臺、顯示等不同光色效果的實現(xiàn)具有一定的指導作用。
[Abstract]:Light emitting diodes (LED:Light Emitting Diode) are widely used in buildings, signal lighting, backlight, display, street, indoor lighting and so on because of their advantages of high luminous efficiency, long life, energy saving and environmental protection. At present, the realization of white LED light source in a wide range of continuous color temperature adjustable, but also to maintain high color rendering in this range, in recent years has become a hot spot. In order to solve the problem of the lack of effective synthesis method for high color white light source in wide color temperature range, the following research work has been done in this paper. Firstly, according to the principle of optical mixing and the pulse width modulation (PWM) method, the two and three channel dimming equations are derived. Two channel dimming method uses cold white and warm white LED to synthesize white light. The color temperature of mixed light source is within 3300K~7500K, and the deviation is less than 32kg. However, the overall color rendering index of the light source is lower than 90. 5%. The three-channel dimming method uses warm white / green / blue LED to synthesize the target light source. The test results show that the maximum error of color temperature between 3200K~7600K is 1.82, and the color rendering index is within 86.5 ~ 95.3, which is much higher than that of two-channel dimming method. Secondly, aiming at the phenomenon that the color index of the three-channel modulated light source is not high enough at low color temperature, this paper based on the three-channel and two-channel dimming method, according to the relationship between the relative color temperature and the specific color coordinate established by the experiment, A "32" dimming method is proposed. The white light source is modulated by controlling the duty cycle of the red / green / blue / warm white (R/G/B/WW) driving signal respectively. The experimental results show that when the luminous flux of the mixed light source is set to 3001m, the color temperature can be continuously adjusted in the range of 2900K~7600K, the deviation of the color temperature is 0.56, the fluctuation of the luminous flux is less than 2.24 when the mixed light source adjusts the color temperature, and the chromogenic index Ra is between 94 and 96. The theoretical and practical deviations are not more than 0.1, and the color temperature is 5 000 K. When the luminous flux varies in the range of 0 ~ 800 1m, the deviation of luminous flux is less than 2. Finally, according to the proposed "32" dimming method and design index, a remote intelligent dimming control system is designed. The system realizes the following functions: through smart phone APP or infrared remote control, realize light source switch, color change, luminous flux adjustment, color temperature adjustment, constant light mode and adaptive mode, etc. In the constant light mode, two NRF24L01 modules are used to communicate the illumination data, and the environmental illumination intensity is consistent with the set value after several coordination. The "32" dimming method presented in this paper has the advantages of simple calculation method, high dimming precision and easy hardware realization. At the same time, the light control system can not only realize the sun-like illumination environment, but also can guide the realization of different light and color effects, such as stage, display and so on.
【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN312.8

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