Static and Dynamic Photoelectrothermal Modeling of LED Lamps Including Low-Frequency Current Ripple Effects

Author

Almeida, Pedro S. ; Bender, Vitor C. ; Braga, Henrique A. C. ; Dalla Costa, Marco A. ; Marchesan, Tiago B. ; Alonso, J. Marcos

Author_Institution

Fed. Univ. of de Juiz de Fora, Juiz de Fora, Brazil

Volume

30

Issue

7

fYear

2015

fDate

42186

Firstpage

3841

Lastpage

3851

Abstract

In this paper, a static and dynamic photoelectrothermal model including the impact of low-frequency current ripple on light-emitting diodes (LEDs) performance is proposed. The objective of this study is to evaluate the dynamical interaction among thermal, photometrical, and electrical properties of the LEDs when they are supplied by a dc constant current with a superposed low frequency sinusoidal ripple, which is the common case in offline LED drivers. Therefore, this paper presents both a model and experimental data for analyzing the LED photometrical behavior in terms of luminous flux, efficacy, flicker, and chromaticity. Three laboratory prototypes with different heat sinks and LED models have been tested. Experimental results are presented to evaluate the LED photometrical behavior under the aforementioned operating conditions and to validate the proposed modeling methodology.

Keywords

LED lamps; driver circuits; heat sinks; thermal properties; DC constant current; LED drivers; LED lamps; LED photometrical; electrical properties; heat sinks; light-emitting diodes; low-frequency current ripple effects; photoelectrothermal modeling; photometrical properties; thermal properties; Equations; Heat sinks; Junctions; Light emitting diodes; Mathematical model; Temperature; Temperature measurement; LED photometrical model; light flicker; light-emitting diode (LED); low-frequency current ripple; offline LED drivers;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2340352

Filename

6858042