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

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3 Author(s)
Yuan Fang ; Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ., Kowloon ; Siu-Hong Wong ; Hok-Sun Ling, L.

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.

Published in:

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

Date of Conference:

15-19 Feb. 2009