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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/48041

Title: On supplying LEDs from very low dc voltages with high frequency AC-LED drivers
Author(s): Castro Álvarez, Ignacio
García Aller, Daniel
Arias Pérez de Azpeitia, Manuel
González Lamar, Diego
Sebastián Zúñiga, Francisco Javier
Issue date: 2018
Publisher: IEEE
Abstract: This work studies the driving of white Light Emitting Diodes (LEDs) from very low voltages in the range of 1.2 to 2 V. The proposed idea is based on replacing the standard Schottky diode used in conventional converter topologies (i.e., buck, buck-boost and boost) with an LED, while shortcutting the output of the converter. In this configuration, the LED works both as the load and as the rectifier diode of the converter, hence, switching the LED at high frequencies (i.e. > 100 kHz). Moreover, a thorough analytical study is carried out for the two topologies rendered in this work. Particularly emphasizing their static analysis and the obtaining of the boundaries between the different conduction modes. Finally, the idea is validated experimentally by means of the boost converter variation (i.e., DL//S AC-LED driver). The DL//S AC-LED driver has also been compared with a dc-dc boost converter showing a better luminous efficacy while disposing of the Schottky diode and the output capacitor. This analysis is carried out when connected to a Li-Ion battery using a simple control and integrated circuit for its development
Description: 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL), 25-28 junio, Padua (Italia)
URI: http://hdl.handle.net/10651/48041
ISBN: 978-1-5386-5541-2
Sponsored: Este trabajo ha sido apoyado por el Gobierno español en el Proyecto MINECO-17-DPI2016-75760-R y el Principado de Asturias a través de la beca "Severo Ochoa" BP14-140 y el Proyecto SV-PA-17-RIS3-4, y por subvenciones del Fondo Europeo de Desarrollo Regional (FEDER)
Project id.: MINECO-17-DPI2016-75760-R
Principado de Asturias/BP14-140
Principado de Asturias/SV-PA-17-RIS3-4
Appears in Collections:Capítulos de libros
Ingeniería Eléctrica, Electrónica, de Computadores y Sistemas
Investigaciones y Documentos OpenAIRE

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