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

Castro, Ignacio; Vázquez, Aitor; Arias, Manuel; Lamar, Diego G.; Hernando, M.M.; Sebastián, J.

doi:10.1109/tpel.2018.2890716

Cited by 52 publications

(20 citation statements)

References 217 publications

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“…Use of an impedance between the ac line and the LED light bulb load to fix and limit the current is mandatory. The main drawbacks of these passive topologies are the low PF and THD featured, sometimes not enough to comply with the standards [14]. Passive LED drivers can be arranged in two main categories, lossy and lossless (ideal) passive circuits [15].…”

Section: Passive Drive Circuitsmentioning

confidence: 99%

Passive and Active Topologies Investigation for LED Driver Circuits

Musumeci¹

2021

Light-Emitting Diodes and Photodetectors - Advances and Future Directions [Working Title]

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In this chapter, a survey of LED driver circuits is presented. The driver circuit is a crucial component in the LED light system. It provides the correct voltage and current values for the best brightness and long life. Furthermore, the driver circuits contribute to obtaining high efficiency and reliability light system. Several lighting applications need different driver topologies that meet the use requirement and the energy sources available. In actual applications, passive and active circuits are implemented to satisfy the LED driver electrical requirements and cost-effective demands. The LED driver circuits investigation evaluate the issues and the solutions in the LED lighting systems connected to a DC source such as a battery or AC line. The AC line connection requisites such as the power factor correction and the harmonic distortion are dealt with both the driver topology and control optimization. Also, the volume reduction need is examined in the circuitry choice. Moreover, the different topologies of the power converters isolated and not isolated used in the driver circuits based on both the power request and supply source are described and critically evaluated.

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Section: Passive Drive Circuitsmentioning

confidence: 99%

Passive and Active Topologies Investigation for LED Driver Circuits

Musumeci¹

2021

Light-Emitting Diodes and Photodetectors - Advances and Future Directions [Working Title]

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“…Segundo Castro et al (2019a), pode-se dividir os drivers trifásicos de estágio único em dois grupos: os de apenas um interruptor controlado (single-switch) e os de dois ou mais interruptores controlados (multi-switch).…”

Section: Estágio úNicounclassified

Acionamento de Arranjos de LEDs de Altíssimas Potências Empregando Drivers Conectados à Rede Trifásica

Rangel

Silva

Almeida

2020

Anais Do Congresso Brasileiro De Automática 2020

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Os LEDs têm se mostrado cada vez mais presentes nos sistemas de iluminação, desde sistemas de pequeno e médio porte (como residencial e iluminação pública), até mesmo em sistemas maiores (holofotes de estádios, por exemplo). Ao funcionarem em corrente contínua, torna-se necessário a presença de drivers fazendo a interface entre a rede e os mesmos. Esses sistemas de acionamento precisam garantir cada vez mais eficiência, confiabilidade e compatibilidade com normas regulamentadoras. Será apresentado uma série de topologias de drivers trifásicos, acreditando-se que os mesmos são mais interessantes para sistemas de altíssima potência, sobretudo por possibilitarem a remoção do capacitor eletrolítico e consequentemente o aumento da vida útil do sistema como um todo. Duas categorias serão tratadas neste trabalho, a saber: estágio único e modular, as quais possibilitam o estudo de várias topologias já existentes no âmbito de acionamento de LEDs. Serão apresentados os resultados mais relevantes de cada topologia e, por fim, é feita uma comparação minuciosa.

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“…In order for the LED to operate normally under alternating current (AC), it must be driven by converting the AC input voltage into the DC output voltage through conversion devices such as transformers, rectifiers, etc. [1]. The conventional method is to connect the AC input source to a bridge rectifier.…”

Section: Introductionmentioning

confidence: 99%

Bridgeless Isolated AC LED Driver

2021

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A novel bridgeless isolated AC LED driver is developed, which improves LED utilization and application flexibility due to a coupled inductor inserted between the bidirectional switch and the LED module without any output electrolytic capacitor. By reducing the turns ratio of the coupled inductor, the voltage across the secondary side will be decreased so as to lessen the voltage across the LED strings and hence reduce the number of LEDs, thereby making the load design of the AC LED driver more flexible. It is noted that the coupled inductor plays a role of not only galvanic isolation but also inductor behavior as well as transformer behavior. Therefore, during the turn-on period of the bidirectional switch, the coupled inductor can transfer the energy to one LED string and store the energy simultaneously, whereas during the turn-off period of the bidirectional switch, the coupled inductor can release the stored energy to the other LED string. That is, two LED strings are conducted over a pulse-width-modulated (PWM) period for any half-cycle, implying that LED utilization is upgraded. As for LED dimming, it is realized by directly tuning the control signal for the bidirectional switch without any dimming circuit. Eventually, the basic operating principles and theoretical deductions are given along with some experimental results provided to verify the effectiveness of the proposed AC LED driver topology.

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

Cited by 52 publications

References 217 publications

Passive and Active Topologies Investigation for LED Driver Circuits

Passive and Active Topologies Investigation for LED Driver Circuits

Acionamento de Arranjos de LEDs de Altíssimas Potências Empregando Drivers Conectados à Rede Trifásica

Bridgeless Isolated AC LED Driver

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