Evaluation of a Synchronous Flyback Driving Parallelized High Efficiency LEDs

Author

Garcia, J. ; Ramos, J.M. ; Lamar, D.G. ; Dalla-Costa, M.A. ; Cardesin, J.

Author_Institution

Univ. of Oviedo, Gijon

fYear

2007

fDate

4-7 June 2007

Firstpage

3036

Lastpage

3040

Abstract

In this paper, parallel connection of high efficiency LEDs for lighting applications is studied. Unlike series connection, parallel connection of LEDs allows the operation of these devices at different current levels. Among other features, this allows the operation of the remaining LEDs if one of them fails. The main drawback of parallel connection is, as is very well known, current equalization and stable operation, due to the V vs. I characteristic of the LED. An active equalization and current limitation with MOSFETs is studied and implemented, thus obtaining a high current-low voltage power load. To supply this load, a 16 W synchronous flyback is used, in order to supply 4 high efficiency LEDs. The overall prototype design and construction is discussed, and electrical and light measurements are presented.

Keywords

MOSFET; light emitting diodes; network topology; MOSFET; active equalization; current equalization; light emitting diodes; parallel connection; power 16 W; series connection; synchronous flyback driving; Driver circuits; Electric variables measurement; LED lamps; Light emitting diodes; Low voltage; MOSFET circuits; Prototypes; Resistors; Switches; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on

Conference_Location

Vigo

Print_ISBN

978-1-4244-0754-5

Electronic_ISBN

978-1-4244-0755-2

Type

conf

DOI

10.1109/ISIE.2007.4375099

Filename

4375099