高效率LED汽车前照灯关键技术研究

发布时间：2018-03-19 00:29

本文选题：LED　切入点：前照灯　出处：《天津大学》2014年博士论文　论文类型：学位论文

【摘要】：LED由于节能、寿命长、响应速度快等优点，成为新一代汽车照明的理想光源。近几年由于LED技术上的巨大进步，高亮度LED已经可以具备了作为前照灯主光源包括近光灯、远光灯光源的条件。然而LED光源与传统汽车照明中的光源相比，在光、电、热、以及机械方面都具有完全不同的特性。这些特性决定了必须采用全新的方法进行前照灯的设计。本文研究了高效率LED前照灯光学设计方法，采用高效率的光学设计实现了LED前照灯，同传统汽车前照灯相比消耗更低的功率。在研究LED前照灯驱动电路基础上还对基于前照灯的可见光通信进行了初步探索，采用基于热管的散热技术，有效地解决了LED前照灯的散热问题。采用器件模拟工具SilvacoTCAD进行了LED光、电、热性能分析，模拟了光子晶体表面结构对LED出光的影响，以提高LED光源效率。论文的主要创新点如下：（1）以LED为光源实现了符合LED汽车前照灯国家标准的全LED前照灯。采用多椭球反射面和非球面透镜进行了近光灯的光学设计，在光学理论分析研究的基础上，采用ASAP光学设计软件进行仿真，建立了前照灯光学系统模型。（2）基于半导体理论，建立了功率型白光LED的光-电-热学模型，进行了仿真。采用FDTD算法，分析了采用光子晶体结构对提高LED光引出效率的影响。基于热学理论，建立了基于热管散热技术的LED前照灯系统模型。（3）在研究汽车用LED驱动电源的基础上，利用LED响应速度快的特点，初步研究了基于LED前照灯的智能控制与可见光通信，为新一代智能汽车智能照明进行了探索。所设计的近光灯采用三颗多芯片封装功率型LED，实现投射式配光，消耗功率45W，，光通量1620流明。远光灯采用2颗LED，消耗功率30瓦，光通量1080流明，而卤素灯近光需要55瓦，远光60瓦。光学测试结果符合课题组起草的LED前照灯国家标准。测试结果表明在环境温度为30度条件下，100mA电流条件下，结温为48摄氏度，在700mA额定电流下，结温测得为120摄氏度。
[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.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U463.651;TM923.34

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