发光二极管系统的光电热理论的研究

The photometric characteristics and electrical characteristics of light-emitting diode (LED) systems will be affected by its junction temperature, so development of the research into these three aspects is critical for LEDs entering into public lighting system. Nowadays, many researchers focus on investigation of the thermal effect. But for our project, unlike the traditional way, we will investigate the following aspects in an integrated manner, including the relationship between the thermal characteristics and electrical characteristics, the effect of junction temperature on its photometric characteristics, and the relationship between the electrical power and luminous flux. In addition, we not only research into the device, and what's more, we will carry out the investigation in a system level,that is LED system. The LED system in this project refers to the LED lamp suitable for interior lighting and road lighting. It's composed of multiple LED devices and a heatsink. The theory we will investigate is based on the previous proposed photo-electro-thermal (PET) theory of light-emitting diode systems. The main research contents are improvement and generalization of the original PET theory, including the transient junction temperature of each LED device inside the lamp, the transient thermal resistor and thermal capacitor network of an LED lamp, the function of luminous efficacy relative to forward current and junction temperature, and the function of electrical power relative to forward current and junction temperature. These research contents will finally lead to a generalized photo-electro-thermal theory for LED systems, which will make a contribution to the optimal design of LED systems.

发光二极管（LED）系统的发光特性及电特性都受到其热特性的影响，开展LED系统热特性的研究是实现LED公共照明技术的关键。本项目为LED照明系统特性研究提出了一种综合研究方法，即，把热特性、电特性和发光特性三者合理的联立起来，综合探讨反映LED系统中发射光通量降低的本质和原因。并非对独立的LED器件进行研究，本项目所着重研究的对象指的是LED照明系统中适用于室内和道路照明的LED照明灯，它由多颗LED器件及相应热沉构成。本项目所着重研究的理论方法是基于申请人及其以前所在团队所提出的LED系统光电热理论。主要研究内容是研究LED系统的光电热理论的不足，即LED照明灯中各个器件的结温温度公式、LED照明灯的瞬态热阻热容网络模型、光通量理论公式中的LED器件的电功率和发光效率。通过本项目的研究，将最终实现广义化的LED系统的光电热理论，这将为最优化LED照明系统设计提供重要的理论基础。

依托本项目，本项目组提出了一种提取LED器件的热容和热时间常数的方法，为LED器件及其模组的热瞬态响应做出了铺垫。在此基础上，通过多次对照明效率在两种不同状态下的测试，摸索出了影响LED照明效率的影响因数，并提出了照明效率的通用表达式，从而为LED照明效率的预测提供了方案。之后，对LED器件的消耗电功率进行了研究，找出了LED器件在正常工作条件下所消耗的电功率的变化规律，确定了引起电功率变化的因数，并确定了他们之间的关系。同时，通过实际测量与物理分析相结合的方法，首次提出了LED器件的光功率的通用表达式，并确定了相关参数及其物理意义，为LED器件光功率的预测提供了便捷方式。LED器件照明效率和光功率的表达式，不仅包含了前置电流的影响，还考虑了结温温度的影响，从而为解释LED器件光通量下降的问题提供了理论依据，为LED模组最优化设计提供了指导。

内容获取失败，请点击重试