基于二维热传导方程的COB-LED散热器热模拟

doi:10.16180/j.cnki.issn1007-7820.2024.03.009

Abstract

Abstract:

For solving the problem about heat dissipation of COB-LED(Chip on Board-Light Emitting Diode), a mathematical model is established based on two-dimensional heat conduction equation which can quickly calculate heat distribution on the surface of COB-LED heat sink in this study. In order to facilitate the solution of the model, the finite difference method is used to solve the mathematical model and the alternate direction implicit scheme is chosen as its difference scheme.According to the boundary conditions and initial conditions in the model, the COB-LED normal temperature lighting experiment is designed, and the simulation analysis is carried out based on ANSYS finite element analysis software. The rationality of the mathematical model is verified by comparing the solution results, simulation results and experimental results. The results show that the relative error of the maximum temperature between the solution result and the experimental results is about 23.57%, and the temperature variation trend of the two is consistent. The maximum temperature relative error between the solution result and simulation results is about 34.84%, and the temperature distribution is close. The rationality and correctness of the mathematical model are proved.

Key words: heat conduction equation, finite difference method, alternative direction implicit scheme, mathematical model, LED heat sink, temperature distribution, experimental validation, simulation analysis

CLC Number:

TN312.8

WANG Chaorui, YANG Ping, HAN Shuai, XU Xinying. Thermal Simulation of COB-LED Heat Sink Based on Two-Dimensional Heat Conduction Equation[J].Electronic Science and Technology, 2024, 37(3): 68-74.

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References 23

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	初始温度 /℃	时间长度 /s	最高温度 /℃	相对误差 /%
求解结果	16	300	37.27	23.57
实验结果	16	300	30.16	23.57

结构	材料	热导率 /W·(m·K)^-1	比热容 /J·(kg·K)^-1
芯片	GaN	130	730
热沉	铝合金	237	900
基板	陶瓷	35	800
铜基板	铜合金	401	385
导热胶	硅胶	6	830

	初始温度 /℃	时间长度 /s	最高温度 /℃	相对误差 /%
仿真结果	16	3 600	30.80	8.77
实验结果	16	3 600	33.76	8.77

	初始温度 /℃	时间长度 /s	最高温度 /℃	相对误差 /%
求解结果	16	300	37.27	34.84
仿真结果	16	300	27.64	34.84

Thermal Simulation of COB-LED Heat Sink Based on Two-Dimensional Heat Conduction Equation

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