Research of the thermal interface of LED lighting sources by thermal relaxation differential spectrometry (TRDS)

J Vėžys,Yu Aliakseyeu,A Vaskou,Yu Bumai,V Minchenya,V Niss

doi:10.21595/jme.2021.21826

Abstract

Thermal relaxation differential spectrometry (TRDS) was used to study the thermal parameters of samples with various design features for heat removal - a powerful LED lamp (150 W) used in industrial and street lighting, low power LED lamps (4 W) with filament emitters, as well as SMD emitter. It is shown that the method of thermal relaxation differential spectrometry is effectively applicable to the study of the structure of thermal parameters of both high-power and low-power LED devices. The method is informative and allows to study in the distribution of thermal resistance and heat flux over the volume and layers of the LED device detail. The use of the TRDS method allows the optimization of the thermal design of LED devices to reduce the overheating temperature of their active regions, and, therefore, to reduce the degradation of LED devices.

Highlights

Thermal parameters were studied for a sample of a CD-RL850-150 high-power light-emitting diode (LED) lamp, manufactured by Cedar Electronics, used in industrial and street lighting
The analysis of the thermal parameters of the measured sample was carried out by the method of thermal relaxation differential spectrometry (TRDS) using a relaxation impedance spectrometer developed at the Belarusian National Technical University (BNTU) [1, 2]
Based on the results of the study of the thermal interface of the CD-RL850-150 lamp with filament emitters and SMD emitters, the original method (TRDS), developed at the Belarusian National Technical University, the following was established: 1) The method of thermal relaxation differential spectrometry is effectively applicable to the study of the structure of thermal parameters of powerful large-sized LED devices

Summary

Introduction

Thermal parameters were studied for a sample of a CD-RL850-150 high-power LED lamp, manufactured by Cedar Electronics, used in industrial and street lighting. In the TRDS method, as opposed to the known methods that use the structure-function and the differential structure function [2-17], as well as those included in the standard [18], the output of measurement results of the thermal parameters of the measured samples is carried out in the form of a spectrum of thermal parameters, similar to conventional types of spectrum, for example, optical. This type of data presentation is quite informative and convenient for analyzing measurement results. External view of the a) CD-RL850-150 lamp and b) the COB matrix

Experimental technique

Findings

Conclusions