针对直下式LED平板灯均匀度低且厚度大的缺点, 提出了一种带有曲面底板的直下式LED平板灯, 采用Taguchi方法设计, 并通过TracePro软件进行仿真模拟, 对影响直下式LED平板灯照度均匀度和平均照度的参数因子进行分析, 并运用ANOVA理论分析出各因子对品质的影响程度, 优化各项结构参数, 以设计出符合要求的产品, 并通过实验对模拟结果进行验证。结果表明: LED芯片排布方式对照度均匀度和平均照度的影响程度都最大, 分别有47.4%和50.2%的贡献度。当芯片选择正六边形排布, 倾斜角度为30°, 平板灯无微结构, 混光距离为25 mm, 得到最优化照明效果。扩散板照度均匀度达到88.3%, 与实验结果基本一致,厚度相对于目前直下式平板灯减少37.5%以上。模拟得到的会议室照明效果满足国家建筑照明设计标准, 所得结果为设计直下式平板灯提供理论依据。

According to the high thickness and low illuminance uniformity of traditional direct-down type LED panel light, a design of direct-down type LED panel light with the curved surface plate was proposed. Some experiments were designed by applying the Taguchi method and simulated via the TracePro software. After that, the ANOVA theory was integrated to evaluate the influence of the control factors on the illumination, so that the control factors can be optimized efficiently, and the simulation results were verified by experiments. The results show that the arrangement of LEDs has most influence on the uniformity of illumination and the average illumination, which account for 47.4% and 50.2% respectively. When the optimized parameters were set as hexagonal chips arrangement, inclination angle was 30°, there was no microstructure and light mixing distance was 25 mm, the uniformity of illumination on the diffusion plate was 88.3%, which were consistent with the experimental results, and the thickness of panel light was reduced by more than 37.5% compared with the current one. After simulating the illumination of conference room, the results completely conform to the national building lighting standards. This paper provides a theoretical basis to design a direct-down type LED panel light.