A Power Converter with Pulse-Level-Modulation Control for Driving High Brightness LEDs

Author

Fang, Yuan ; Wong, Siu-Hong ; Ling, Lawrence Hok-Sun

Author_Institution

Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ., Kowloon

fYear

2009

fDate

15-19 Feb. 2009

Firstpage

577

Lastpage

581

Abstract

High brightness (HB) LED provides higher efficacy and reliability over incandescent light bulb. Different from incandescent light bulb, HB LED needs to be driven by accurate constant current for consistent brightness and color-temperature light emission. With a novel method pulse-level-modulation (PLM) control applied on conventional switched-mode power stage, a more robust, power-efficient and accurate power converter for driving HB LEDs is realized. This paper includes the step-by-step design of the realized power converter. Demonstration of the circuit driving a string of 0.35A HB LEDs is presented.

Keywords

driver circuits; filament lamps; light emitting diodes; power convertors; reliability; PLM control; circuit driving; high brightness LED; incandescent light bulb; power converter; pulse-level-modulation control; reliability; switched-mode power stage; Brightness; Buck converters; Design engineering; Inductors; Light emitting diodes; Optical arrays; Power engineering and energy; Schottky diodes; Sensor arrays; Switched-mode power supply;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE

Conference_Location

Washington, DC

ISSN

1048-2334

Print_ISBN

978-1-4244-2811-3

Electronic_ISBN

1048-2334

Type

conf

DOI

10.1109/APEC.2009.4802715

Filename

4802715