Title :
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
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;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-2811-3
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2009.4802715
