Simulation of LED based luminaires by using multi-domain compact models of LEDs and compact thermal models of their thermal environment

Abstract

Fast and accurate prediction of hot lumens of LEDs installed in luminaires is an important step in the design of robust and reliable products. A possible approach to this is to create a multi-domain circuit model of a complete LED chip+package+luminaire system that can be simulated by any Spice-like circuit simulator with electro-thermal capabilities. Many LED chip and LED package models and modeling techniques have been published recently, but compact thermal modeling of luminaires as multi heat-source system was not yet dealt with in the literature. This paper aims to fill this gap be describing a systematic approach for system (luminaire) level analysis aimed at solving the combined thermal, electrical and light output simulation problem consistently by describing a method for creating a compact thermal model of LED luminaries with an approach borrowed from the layout based electro-thermal simulation of analog ICs. The applicability of the described method is demonstrated with a real life example, including the validation of the results with thermal measurements.