Three-Phase Resonant Switched Capacitor LED Driver With Low Flicker

Coutinho, Ronaldo P.; Souza, Kleber C. A. De; Antunes, Fernando Luiz Marcelo; Mineiro, Edilson

doi:10.1109/tie.2017.2677305

Cited by 22 publications

(12 citation statements)

References 44 publications

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“…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%

“…In order to attain Iac and φ, it is necessary to solve (16). This equation can be simply solved by applying wave superposition theory, which is widely used in other fields of study [23], reducing the problem to the sum of two plane waves with different amplitude.…”

Section: Bmentioning

confidence: 99%

“…Some authors have tackled the design of three-phase non-isolated LED drivers based on switched capacitors [16]. These drivers can achieve high power density, high efficiency and do not require current sensing to maintain a stable light output.…”

mentioning

confidence: 99%

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

Castro

Arias

Lamar

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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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%.

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Section: Discussionmentioning

confidence: 99%

Section: Bmentioning

confidence: 99%

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

Castro

Arias

Lamar

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Furthermore, the most important aspect is the increase in size and weight that a LF autotransformer does to the whole system [208]. In order to solve the aforementioned issues the use of specific three-phase ac-dc converters to drive LED loads increasing both efficiency and power density, while guaranteeing non-flicker performance have been proposed [209], [210]. This section will focus on the most promising solutions for LED driving based on three-phase acdc considering the lack of previous literature on the topic.…”

Section: -99 <10mentioning

confidence: 99%

“…Continuing the analysis, some authors have tackled the design of three-phase multi-switch ac-dc LED drivers by means of switched capacitor converters, see Fig. 17 (b) [210]. These ac-dc LED drivers can achieve high power density, high efficiency, do not require current sensing to maintain a stable light and can have lower output voltages.…”

Section: A Single-stagementioning

confidence: 99%

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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Light-Emitting Diodes (LEDs) are coming strongly into the lighting market due to their advantages over conventional lighting solutions: energy efficient, controllable in both light and color, long lifetime, lack of a warm-up period and high power density. Some of these advantages will make LED light sources to be more than just a lightbulb, being able to transmit data, control light color, hue and intensity or even detect people in indoor environments. Nevertheless, these advantages attributed to LED capabilities are, in reality, achieved thanks to the LED driver. The present work reviews the current stateof-the-art strategies to drive LEDs from ac power grids with special emphasis into removing the most limiting component from the point of view of the lifetime, which is the electrolytic capacitor, while achieving a flicker-free performance of the light output of the LED driver. Moreover, it focuses on analyzing the required regulations, challenges and applicability of LED drivers in both single-phase and three-phase ac power grids.Note: This only applies for certified dimmable luminaires. Audible noiseLuminaire shall not emit noise above 24 dBA at 1 meter or less at the minimum output.0885-8993 (c)

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Variable Frequency Constant Current Control Method for Switched-Capacitor Converter Based Automotive LED Driver

Yang

Zhang

2019

IEEE Access

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A variable-frequency constant-current control (VFCCC) method with the constant ON-time is proposed in this paper for a switched-capacitor (SC) converter-based automotive LED driver. This control method is based on the one-cycle control method. The stable load current regulation could be achieved with the simple analog topology. The variable load current is conveniently set by changing the reference value. In order to reduce the current spikes, the SC topology presented in this paper introduces an inductor in the charge loop. To verify the performance of the proposed control method, a 36-W SC converter is constructed. The VFCCC-controlled SC converter is tested under different operation conditions with the different input voltages and variable constant ON-time. The experimental and simulated results show that with the proposed control method, the external disturbance could be rejected with the fast-dynamical response speed and robust performance. With the SC converter, the high-power density could be realized for the automotive LED driver. The VFCCC control method is suited for the different topologies of SC converters. It could facilitate the SC applications for the automotive LED driver.INDEX TERMS Variable frequency constant current control (VFCCC) method, one-cycle control, switchedcapacitor (SC) converter, automotive LED driver.

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Three-Phase Resonant Switched Capacitor LED Driver With Low Flicker

Cited by 22 publications

References 44 publications

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

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

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Variable Frequency Constant Current Control Method for Switched-Capacitor Converter Based Automotive LED Driver

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