Interleaved Buck Converter for Fast PWM Dimming of High-Brightness LEDs

The goal of this paper is the evaluation of the interleaved buck converter as a high-brightness (HB) LEDs electronic driver, comparing its performance with the standard buck converter. The main drawbacks of the standard converter come from the high inductor value necessary to guarantee low output cu...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2011-09, Vol.26 (9), p.2627-2636
Main Authors: Garcia, Jorge, Calleja, Antonio J., Corominas, Emilio Lopez, Vaquero, David Gacio, Campa, Lidia
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit properties
Converters
Convertors
Driver circuits
Electric currents
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electronic circuits
Electronics
Exact sciences and technology
High-brightness (HB) LED drivers
Inductors
interleaved converters
Light emitting diodes
lighting electronics
Magnetic devices
Power electronics, power supplies
Pulse width modulation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Switches
Switching
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Summary:The goal of this paper is the evaluation of the interleaved buck converter as a high-brightness (HB) LEDs electronic driver, comparing its performance with the standard buck converter. The main drawbacks of the standard converter come from the high inductor value necessary to guarantee low output current ripple, which result in high inductor losses and rough switching waveforms at the semiconductors. Additionally, when the application demands pulsewidth modulation (PWM) dimming, this high inductance value yields to a relatively low dimming frequency that can result in audible noise problems due to several phenomena as magnetostrictive effects at the inductors or piezoelectric effects at the capacitors. The proposed interleaved converter obtains low output current ripple with much smaller inductances, thus allowing PWM dimming at higher frequencies (20 kHz and beyond), avoiding audible noise. Moreover, such low inductances, along with the triangular waveforms obtained with the proposed control method, yield to a higher efficiency than in the standard converter. After reviewing the main operation concept of the interleaved converter, a full design process is particularized for driving HB LEDs. A full-dimming range experimental setup has been built and tested, and experimental results are shown and discussed, compared with those obtained for the standard converter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2121922