Research and Implementation of a Heat Dissipation Optimization Design Method for Embedded LED Down Lights

LIU Min; HU Jianqiu; GOU Congjun

doi:10.3969/j.issn.1002-6150.2025.07.012

Abstract：Heat dissipation optimization is carried out for LED embedded lighting down lights.FloEFD software is used to simulate and analyze the fin radiator structure of the lighting fixture,and the influence of single factors such as the thickness of radiator base,fin height,fin number and number of vent holes on the performance of the radiator is explored.The orthogonal test method was used to design a combination experiment for the above four factors,and the corresponding experimental results were obtained through thermal simulation.After the range analysis of the data,the influence degree of the four main factors,namely the thickness of the radiator base,the height of the fins,the number of fins and the number of ventilation holes,on the heat dissipation effect of the radiator was finally obtained,and the influence degree of the four main factors from the largest to the smallest was sorted as follows:Fin height＞Number of vent holes＞Thickness of radiator base＞Number of fins.After comparing the experimental range value R and analyzing the horizontal trend diagram of the factors,the optimal improvement scheme was obtained:when the thickness of the radiator base was 22.5 mm,the height of the fins was 50 mm,the number of fins was 35,and the number of ventilation holes was 24,the performance of the radiator was the best.At the ambient temperature of 25℃,the tc point of the LED chip was reduced from 46.13℃before improvement to 43℃.At the same time,the paper studies the influence of thermal paste coating thickness,thermal conductivity of thermal paste and surface treatment process on heat dissipation of LED lighting fixtures in actual production.The experimental simulation results show that the thickness of thermal paste should be controlled below 0.2 mm;When the thermal conductivity of the thermal paste used in lighting products is selected from 1 W/(m·K)～2 W/(m·K),the product cost performance is relatively high;If the final LED lighting fixture requires surface treatment,a good surface treatment process has a greater impact on the temperature of the LED finished lighting fixtures.