Efficient two-stage offline driver for extra-high-current COB LED applications
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ORIGINAL PAPER
Efficient two-stage offline driver for extra-high-current COB LED applications Dênis de C. Pereira1 · Eric G. Pusiol1 · Guilherme M. Soares1 · Pedro S. Almeida1 · Fernando L. Tofoli2 Henrique A. C. Braga1
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Received: 30 January 2020 / Accepted: 11 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This work proposes a reliable and efficient two-stage driver solution for extra-high-current (EHC) chip-on-board (COB) light-emitting diode (LED) applications. An ac–dc boost converter operating in continuous conduction mode is employed to provide input power factor correction and regulated dc-link voltage. Considering that EHC COB LEDs often operate at higher current levels than those employed in conventional high-powered lighting applications, a dc–dc extended gain interleaved buck converter (EGIBC) is employed so that power control is achieved. The average state-space modeling of the EGIBC is derived, while a digital control system is also implemented for this purpose. A 500-W prototype of the proposed two-stage topology is implemented, which does not require electrolytic capacitors. The obtained results clearly demonstrate that the proposed driver complies with international power quality and flicker standards. Thus, it can be consolidated as a viable choice for practical applications involving outdoor floodlighting where high luminous flux is mandatory. Keywords Dynamic modeling · Extended gain interleaved buck converter · Extra-high-current COB LEDs · Output current control · Power factor correction · Two-stage drivers
1 Introduction Light-emitting diodes (LEDs) have become quite popular in the last decade owing to their prominent characteristics regarding long lifespan, high efficiency, high reliability, fast response, among other aspects that make them a prominent alternative for a wide variety of lighting applications [1, 2]. In this context, the development of LED drivers is essential for efficient solid-state lighting (SSL) designs, which rely strongly on power electronic converters. The main limitation associated with single-chip LEDs lies in low power ratings, while the luminous flux is reduced as a consequence. Besides, since commercial LEDs employ low dc operating voltages, many elements are associated in the form of arrays when high luminous flux is required. Such
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Fernando L. Tofoli [email protected]
1
Modern Lighting Research Group (NIMO), Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais 360010-970, Brazil
2
Department of Electrical Engineering, Federal University of São João del-Rei, São João del-Rei, Minas Gerais 36307-352, Brazil
luminaires or reflectors are often supplied by the ac utility grid by means of a power converter, which is mainly constituted of an ac–dc stage associated with a control strategy or even an additional converter to regulate the LED array current. In this context, the literature presents numerous solutions to drive LEDs, which include the development of single-stage and two-stage drivers [3, 4]. Impor
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