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On Supplying LEDs from Very Low dc Voltages with High Frequency AC-LED Drivers

Author:
Castro Álvarez, IgnacioUniovi authority; Vázquez Ardura, AitorUniovi authority; García Aller, DanielUniovi authority; Arias Pérez de Azpeitia, ManuelUniovi authority; González Lamar, DiegoUniovi authority; Sebastián Zúñiga, Francisco JavierUniovi authority
Subject:

AC-LED driving

LED driver

Low input voltages and single-cell battery

Publication date:
2018
Editorial:

IEEE

Publisher version:
http://dx.doi.org/10.1109/TPEL.2018.2869795
Citación:
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

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; 1941-0107
DOI:
10.1109/TPEL.2018.2869795
Patrocinado por:

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)

Id. Proyecto:

MINECO-/17-DPI2016-75760-R

Principado de Asturias/BP14-142

Principado de Asturias/FC-15-GRUPIN14-143

Principado de Asturias/SVPA-17-RIS3-4

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