本文選題：LED　切入點(diǎn)：前照燈　出處：《天津大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：LED由于節(jié)能、壽命長、響應(yīng)速度快等優(yōu)點(diǎn)，成為新一代汽車照明的理想光源。近幾年由于LED技術(shù)上的巨大進(jìn)步，高亮度LED已經(jīng)可以具備了作為前照燈主光源包括近光燈、遠(yuǎn)光燈光源的條件。然而LED光源與傳統(tǒng)汽車照明中的光源相比，在光、電、熱、以及機(jī)械方面都具有完全不同的特性。這些特性決定了必須采用全新的方法進(jìn)行前照燈的設(shè)計(jì)。 本文研究了高效率LED前照燈光學(xué)設(shè)計(jì)方法，采用高效率的光學(xué)設(shè)計(jì)實(shí)現(xiàn)了LED前照燈，同傳統(tǒng)汽車前照燈相比消耗更低的功率。在研究LED前照燈驅(qū)動(dòng)電路基礎(chǔ)上還對基于前照燈的可見光通信進(jìn)行了初步探索，采用基于熱管的散熱技術(shù)，有效地解決了LED前照燈的散熱問題。采用器件模擬工具SilvacoTCAD進(jìn)行了LED光、電、熱性能分析，模擬了光子晶體表面結(jié)構(gòu)對LED出光的影響，以提高LED光源效率。論文的主要?jiǎng)?chuàng)新點(diǎn)如下： （1）以LED為光源實(shí)現(xiàn)了符合LED汽車前照燈國家標(biāo)準(zhǔn)的全LED前照燈。采用多橢球反射面和非球面透鏡進(jìn)行了近光燈的光學(xué)設(shè)計(jì)，在光學(xué)理論分析研究的基礎(chǔ)上，采用ASAP光學(xué)設(shè)計(jì)軟件進(jìn)行仿真，建立了前照燈光學(xué)系統(tǒng)模型。 （2）基于半導(dǎo)體理論，建立了功率型白光LED的光-電-熱學(xué)模型，進(jìn)行了仿真。采用FDTD算法，分析了采用光子晶體結(jié)構(gòu)對提高LED光引出效率的影響�；跓釋W(xué)理論，建立了基于熱管散熱技術(shù)的LED前照燈系統(tǒng)模型。 （3）在研究汽車用LED驅(qū)動(dòng)電源的基礎(chǔ)上，利用LED響應(yīng)速度快的特點(diǎn)，初步研究了基于LED前照燈的智能控制與可見光通信，為新一代智能汽車智能照明進(jìn)行了探索。 所設(shè)計(jì)的近光燈采用三顆多芯片封裝功率型LED，實(shí)現(xiàn)投射式配光，消耗功率45W，，光通量1620流明。遠(yuǎn)光燈采用2顆LED，消耗功率30瓦，光通量1080流明，而鹵素?zé)艚庑枰?5瓦，遠(yuǎn)光60瓦。光學(xué)測試結(jié)果符合課題組起草的LED前照燈國家標(biāo)準(zhǔn)。測試結(jié)果表明在環(huán)境溫度為30度條件下，100mA電流條件下，結(jié)溫為48攝氏度，在700mA額定電流下，結(jié)溫測得為120攝氏度。
[Abstract]:Due to the advantages of energy saving, long life and fast response, LED has become the ideal light source for the new generation of automobile lighting. Due to the great progress of LED technology in recent years, the high brightness LED can be used as the main light source of headlamp, including near-light lamp. However, the LED light source has completely different characteristics in terms of light, electricity, heat, and machinery compared with the traditional automotive lighting source. These characteristics make it necessary to adopt a new method to design the headlight. In this paper, the optical design method of high efficiency LED headlamp is studied, and the LED headlamp is realized by high efficiency optical design. Compared with the traditional automobile headlamp, the power consumption is lower. On the basis of studying the driving circuit of the LED headlamp, the visible light communication based on the headlamp is preliminarily explored, and the heat dissipation technology based on the heat pipe is adopted. The heat dissipation problem of LED headlamp is effectively solved. The optical, electrical and thermal properties of LED are analyzed by means of SilvacoTCAD, and the influence of photonic crystal surface structure on the output of LED is simulated. In order to improve the efficiency of LED light source. The main innovation of this paper is as follows:. Using LED as the light source, the full LED headlamp is realized according with the national standard of LED vehicle headlamp. The optical design of near-light lamp is carried out by using multi-ellipsoidal reflector and aspherical lens. Based on the analysis of optical theory, The optical system model of headlamp is established by using ASAP optical design software. Based on semiconductor theory, a photoelectric-thermal model of power white light LED is established and simulated. The effect of photonic crystal structure on improving the efficiency of optical extraction of LED is analyzed by using FDTD algorithm. The model of LED headlamp system based on heat pipe heat dissipation technology is established. Based on the research of LED driving power supply for automobile, the intelligent control and visible light communication based on LED headlight are preliminarily studied by using the characteristics of fast response speed of LED, and the exploration is made for the new generation intelligent lighting of intelligent vehicle. The designed near-light lamp uses three multi-chip encapsulated power type LEDs to achieve projective light distribution. The power consumption is 45W and the luminous flux is 1620 lumens. The far-light lamp uses 2 LEDs, consumes 30 watts of power, and has a luminous flux of 1080 lumens, while the halogen lamp needs 55 watts of near-light. The optical test results are in accordance with the national standards for LED headlamps drafted by the research group. The results show that the junction temperature is 48 degrees Celsius under the ambient temperature of 30 degrees and the junction temperature is 48 degrees Celsius at the rated current of 700mA. The junction temperature was measured at 120 degrees Celsius.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：U463.651;TM923.34

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