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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/48550

Title: On Supplying LEDs from Very Low dc Voltages with High Frequency AC-LED Drivers
Author(s): Castro Álvarez, Ignacio
Vázquez Ardura, Aitor
García Aller, Daniel
Arias Pérez de Azpeitia, Manuel
González Lamar, Diego
Sebastián Zúñiga, Francisco Javier
Keywords: AC-LED driving
LED driver
Low input voltages and single-cell battery
Issue date: 2018
Publisher: IEEE
Publisher version: http://dx.doi.org/10.1109/TPEL.2018.2869795
Citation: IEEE Transactions on Power Electronics (2018); doi:10.1109/TPEL.2018.2869795
Abstract: This paper studies the driving of white Light Emitting Diodes (LEDs) from very low voltages in the 1.2 to 2 V range. 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 the rectifier diode of the converter, hence switching the LED at high frequencies (> 100 kHz). Moreover, a thorough analytical study is carried out for the two topologies proposed in this paper, emphasizing in particular their static analysis and the obtaining of the boundaries between the different conduction modes. Finally, the idea is experimentally validated by means of the boost converter variation (i.e., the DL//S AC-LED driver). The DL//S AC-LED driver was also compared with a dc-dc boost converter, showing a better luminous efficacy while disposing of the Schottky diode and the output capacitor. The analysis was carried out when connected to a Li-Ion battery using a simple control and integrated circuit for its development
URI: http://hdl.handle.net/10651/48550
ISSN: 0885-8993
Sponsored: Trabajo financiado por el Gobierno español, en el marco del Proyecto MINECO-17-DPI2016-75760-R; por el Principado de Asturias, Severo Ochoa BP14-142, Proyecto FC-15-GRUPIN14-143 y Proyecto SVPA-17-RIS3-4, y en parte por el Fondo Europeo de Desarrollo Regional(FEDER)
Project id.: MINECO-/17-DPI2016-75760-R
Principado de Asturias/BP14-142
Principado de Asturias/FC-15-GRUPIN14-143
Principado de Asturias/SVPA-17-RIS3-4
Appears in Collections:Artículos
Ingeniería Eléctrica, Electrónica, de Computadores y Sistemas
Investigaciones y Documentos OpenAIRE

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