A novel method of current equalization in LED strings based on simple linear circuit

Author

Almeida, Pedro S. ; Jorge, João M. ; Rodrigues, Cláudio R B S ; Soares, Guilherme M. ; Pinto, Danilo P. ; Braga, Henrique A C

Author_Institution

NIMO - Modern Lighting Res. Group, Fed. Univ. of Juiz de Fora (UFJF), Juiz de Fora, Brazil

fYear

2011

fDate

27-30 June 2011

Firstpage

95

Lastpage

100

Abstract

This paper focuses on the problem of driving parallel strings of LEDs while ensuring current equalization between them. This issue is addressed in terms of proposing a small and simple linear topology that can be used on a number of series-associated LEDs, working as a constant current source for each string. Such topology employs a four-component circuit, with low dependence on transistor parameters, ensuring easy repeatability and good current regulation. Mathematical description of the circuit and experimental results are provided.

Keywords

constant current sources; light emitting diodes; network topology; LED strings; constant current source; current equalization; current regulation; driving parallel strings; four-component circuit; linear topology; series-associated LED; simple linear circuit; transistor parameters; Equalizers; Light emitting diodes; Resistors; Switches; Transistors; Voltage control; Voltage measurement; LED string driving; LEDs; current equalization; solid state lighting;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics (ISIE), 2011 IEEE International Symposium on

Conference_Location

Gdansk

ISSN

Pending

Print_ISBN

978-1-4244-9310-4

Electronic_ISBN

Pending

Type

conf

DOI

10.1109/ISIE.2011.5984139

Filename

5984139