Two phase interleaved buck converter for driving high power LEDs

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Abstract

The goal of this paper is to evaluate an interleaved buck topology for driving high current light-emitting diodes. Low output capacitor value allows the use of non-electrolytic capacitors extending the lifetime of the converter. Converter is operated as a constant, regulated current source which increases luminous efficacy of LED compared to PWM dimmed system. Because of the low dynamic resistance of LEDs the duty cycle of the converter does not change greatly with controlled current. By setting the input voltage of the buck converter to around twice the voltage of diode strings, converter can be operated close to the 50% duty cycle, where the ripple attenuation is the highest.
Original languageEnglish
Title of host publicationProceedings of the 14th European Conference on Power Electronics and Applications (EPE 2011)
Number of pages6
PublisherIEEE Press
Publication date2011
ISBN (Print)978-1-61284-167-0
ISBN (Electronic)978-90-75815-15-3
Publication statusPublished - 2011
Event14th European Conference on Power Electronics and Applications (EPE 2011) - Birmingham, United Kingdom
Duration: 30 Aug 20111 Sept 2011

Conference

Conference14th European Conference on Power Electronics and Applications (EPE 2011)
Country/TerritoryUnited Kingdom
CityBirmingham
Period30/08/201101/09/2011

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