AC-DC single-switch three-phase converter with peak current control for power LEDs

Vázquez

IEEE J. Emerg. Sel. Topics Power Electron.

et al. 2019

The proposal of this work is a modular three-phase ac-dc LED driver for high power luminaires based on Light-Emitting Diodes (LEDs), that uses each phase to control an independent LED load removing in the process both the electrolytic capacitor and the second stage to increase both the lifetime and the efficiency. The driving of each LED load is done by means of a dc-dc converter operating as a Loss Free Resistor responsible for controlling the current across it. Furthermore, each dc-dc converter needs to achieve Power Factor Correction (PFC) to comply with the restrictive IEC 61000-3-2 Class C requirements. Hence, achieving unity Power Factor (PF) and low Total Harmonic Distortion (THD). Taking advantage of the light properties, the output of the LED driver will be the sum of the light of each of the phases. Therefore, a theoretical study will be carried out to observe the feasibility of removing the electrolytic capacitor while guaranteeing a flicker free behaviour of the LED luminaire, even if the current of each string is pulsating at twice the mains frequency. This particular performance under high output current and voltage ripples requires reevaluating the wellknown limits between the conduction modes in PFC converters. In addition, the theoretical analysis also discusses and proposes control methods for the LED driver, which thanks to its modularity can easily scale in power to drive high power luminaires. In order to validate the theoretical analysis, a prototype has been built comprised of three PFC boost converters disposing of their electrolytic capacitors. The designed prototype operates in the full range of the European three-phase line voltage, which varies between 380 V and 420 V, and supplies an output light of 42.000 lm at a maximum power of 300 W while achieving an electrical efficiency of 97.5%.

Section: Discussionmentioning

confidence: 99%

“…1 (a). However, its PF is roughly 0.9 for the higher voltages of the European three-phase grid, its efficiency is well below the desired 90% for an LED driver and the switch needs to withstand high voltages unless a snubber is used [13]. These characteristic make this driver unfitting for luminaries of more than 200 W.…”

Section: Introductionmentioning

confidence: 99%

An Electrolytic Capacitorless Modular Three-Phase AC–DC LED Driver Based on Summing the Light Output of Each Phase

Vázquez

IEEE J. Emerg. Sel. Topics Power Electron.

et al. 2019

“…In summary, the experimental results have shown an LED driver capable of achieving a constant light output that meets the flicker regulation, compliance with the harmonic injection regulation and a high efficiency. In fact, the efficiency increase compared to three-phase state of the art LED drivers is not inconsequential, improving those solutions by more than 6% efficiency [7], [9], [11], [16]. Furthermore, the control of the LED driver is not more complex or costly, becoming a possibility the input parallelization of cells per phase, to further increase the power capabilities of the driver, without increasing or changing the central unit.…”

Section: Discussionmentioning

confidence: 99%

“…1 (a). However, its PF its roughly 0.9 for the higher voltages of the European threephase grid, its efficiency is well below the desired 90% for an LED driver and the switch needs to withstand high voltages unless a snubber is used [7]. These characteristic make this driver unfitting for luminaries of more than 200W.…”

mentioning

confidence: 99%

Modular three-phase ac-dc LED driver based on summing the light output of each phase

Arias

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

et al. 2018

Abstract-This work proposes the driving of high power Light-Emitting Diodes (LEDs) luminaires in three phase power grids using each phase to drive an independent LED load. The driving is done by means of a boost converter in charge of controlling the current across its LED load. Moreover, each boost converter needs to achieve Power Factor Correction (PFC) to comply with IEC 61000-3-2 Class C requirements. Hence, achieving unity Power Factor (PF) and low Total Harmonic Distortion (THD). Taking advantage of the light properties, the output of the LED driver will be the sum of the light of each of the phases. Therefore, a theoretical study will be carried out to observe the feasibility of removing the electrolytic capacitor while guaranteeing a flicker free behaviour of the LED luminaire, even if the current of each string is pulsating at twice the mains frequency. In order to validate the study, a prototype has been built comprised of three PFC boost converters disposing of their electrolytic capacitors. The designed prototype operates in the full range of the European three-phase line voltage, which varies between 380 V and 420 V, and it supplies an output light of 42.000 lm at a maximum power of 300 W while achieving an electrical efficiency of 97.5%.

“…In order to obtain high quality sinusoidal input waveforms, several three-phase buck-boost have been proposed based on a single switch [14], [15] or even two switches [16] to lower the voltage strain on them. However, these topologies require the use of a transformer with three windings, whose coupling will dictate the quality of the input current.…”

Section: Introductionmentioning

confidence: 99%

Multicell Three-Phase AC–DC Driver for HB-LED Lighting Applications

IEEE Trans. on Ind. Applicat.

Arias

et al. 2017

He was an Assistant Professor and an Associate Professor at both the UPM and the University of Oviedo. Since 1992, he has been with the University of Oviedo, where he is currently a Professor. His research interests are switchingmode power supplies, modeling of dc-to-dc converters, low output voltage dc-to-dc converters, high power factor rectifiers, LED drivers, dc-to-dc converters for envelope tracking techniques and the use of wide band-gap semiconductors in power supplies.