A LED driver with switched capacitor

Author

dos Santos Filho, Esio Eloi ; Antunes, F.L.M. ; Miranda, Pedro H. A. ; Sa, Edilson M.

Author_Institution

Group of Energy Process. & Control - GPEC, Univ. Fed. of Ceara - UFC, Fortaleza, Brazil

fYear

2012

fDate

5-7 Nov. 2012

Firstpage

1

Lastpage

6

Abstract

The paper proposes a switched-capacitor converter fed at 24 V to drive power light emitting diodes (LEDs). In contrast to conventional constant dc current drivers, the current pulse is provided by this switched-capacitor. In the present driver, the capacitor is charged and discharged through the output and the current flow direction is controlled by switches. Based on the charge control analysis, the effects of switching devices on the proposed converter are discriminated and evaluated. A 5 W converter prototype has been implemented. The experimental results demonstrated the technical feasibility of the proposed converter for LEDs.

Keywords

driver circuits; light emitting diodes; power convertors; LED converter; LED driver; capacitor charging; capacitor discharging; charge control analysis; constant DC current drivers; converter prototype; current flow direction; current pulse; power 5 W; power LED; power light emitting diodes; switched-capacitor converter; switching devices; technical feasibility; voltage 24 V; Capacitance; Capacitors; Inductors; Light emitting diodes; RLC circuits; Switches; Switching frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications (INDUSCON), 2012 10th IEEE/IAS International Conference on

Conference_Location

Fortaleza

Print_ISBN

978-1-4673-2412-0

Type

conf

DOI

10.1109/INDUSCON.2012.6453637

Filename

6453637