Self-oscillating flyback driver for power LEDs

Author

Sá, E. Mineiro, Jr. ; Postiglione, C.S. ; Santiago, R.S. ; Antunes, F.L.M. ; Perin, A.J.

Author_Institution

Inst. Fed. de Educ., Cienc. e Tecnol. do Ceara, IFCE Sobral, Sobral, Brazil

fYear

2009

fDate

20-24 Sept. 2009

Firstpage

2827

Lastpage

2832

Abstract

The self-oscillating flyback converter is a popular circuit for cost-sensitive applications due to its simplicity and low component count. It is widely employed in mobile phone chargers and as the stand-by power source in off-line power supplies for data-processing equipment. However, this circuit was almost not explored for supplying power LEDs. This paper presents a self-oscillating flyback driver for supplying Power LEDs directly, with no additional circuit. A simplified mathematical model of the LED was used to characterize the self-oscillating converter for driving the power LEDs. With the proposed converter the LEDs manufacturing tolerances and drifts over temperature presents little to no influence over the LED average current. This is proved by using the LED electrical model on the analysis.

Keywords

DC-DC power convertors; LED lamps; data-processing equipment; mobile phone chargers; offline power supplies; power LED; self-oscillating flyback converter; self-oscillating flyback driver; stand-by power source; Bipolar transistor oscillators; DC-DC power conversion; Light-emitting diodes; Lighting and Power supplies;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition, 2009. ECCE 2009. IEEE

Conference_Location

San Jose, CA

Print_ISBN

978-1-4244-2893-9

Electronic_ISBN

978-1-4244-2893-9

Type

conf

DOI

10.1109/ECCE.2009.5316150

Filename

5316150