NDLI: Optimization of a Front-End DCM Buck PFP for an HPF Integrated Single-Stage LED Driver

Content Provider	IEEE Xplore Digital Library
Author	Gacio, D. Alonso, J.M. Garcia, J. Garcia-Llera, D. Cardesin, J.
Copyright Year	2013
Abstract	There is currently a trend in power electronics to avoiding the use of electrolytic capacitors in LED drivers, provided that their expected life span is much lower than that of the LEDs, thus reducing the reliability of the entire LED fixture. This paper presents an optimization study about the determination of the minimal bus capacitance needed for reducing the power factor preregulator (PFP) stage dc-link capacitor down to values that are available in metalized-film technology. This optimization study will be applied to the buck converter, which is an interesting topology for high power factor (HPF) LED drivers due to its low component count, HPF, low output voltage, and lower voltage stress on semiconductors than the boost or buck-boost PFPs, which yields to lower efficiency decline under dimming operation. This way, a 70-W integrated buck-flyback converter is developed and proposed with an metalized-film polypropylene (MKP) dc-link capacitor, intended for outdoor applications where a high reliability is pursued, and capable of driving several LED lamps in different configurations. The experimental results show the accuracy of the theoretical predictions, confirming the feasibility of the buck converter as a high-performance PFP.
Starting Page	666
Ending Page	678
Page Count	13
File Size	6098498
File Format	PDF
ISSN	21686777
Volume Number	3
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitors Voltage measurement Harmonic analysis Optimization Power measurement Power electronics Resistors electrolytic capacitor-less converter LED lighting LED drivers Active Power Factor Correction, Active power factor (PF) correction
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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