Two-stage power conversion architecture for an LED driver circuit
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This paper presents a merged-two-stage circuit topology suitable for efficient LED drivers operating from either wide-range dc input voltage or ac line voltage. This two-stage topology is based on a soft-charged switched-capacitor pre-regulator/transformation stage and a high-frequency magnetic regulator stage. Soft charging of the switched capacitor circuit, zero voltage switching of the high-frequency regulator circuit, and time-based indirect scale current control are used to maintain high efficiency, high power density, and high power factor. Two implementations of the proposed architecture are demonstrated: a wide input voltage range dc-dc converter and a line interfaced ac-dc converter. The dc-dc converter shows 85–95% efficiency at 20 W power across 25–200 V input voltage range, and the ac-dc converter achieves 88% efficiency with 0.93 power factor at 8.4 W average power.
Date issued
2013-03Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics; Massachusetts Institute of Technology. School of EngineeringJournal
Proceedings of the 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Lim, Seungbum, John Ranson, David M. Otten, and David J. Perreault. “Two-Stage Power Conversion Architecture for an LED Driver Circuit.” 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) (March 2013).
Version: Author's final manuscript
ISBN
978-1-4673-4355-8
978-1-4673-4354-1
978-1-4673-4353-4
ISSN
1048-2334