Comparative analysis of power LEDs dimming methods

Rodrigues, Welbert Alves; Morais, Lenin Martins Ferreira; Donoso-Garcia, P.F.; Cortizo, P.C.; Seleme, Seleme Isaac

doi:10.1109/cobep.2011.6085232

Cited by 16 publications

(11 citation statements)

References 7 publications

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“…16. The THDs are 19.07% (at load variation 100%), 16.51% (at 72%), 20.34% (at 58%), 19.07% (at 44%), 25.71% (at 41%), 25.71% (at 33%) and 25.71% (at 32%), respectively.…”

Section: The Experimental Resultsmentioning

confidence: 99%

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The Dimmable Single-stage Asymmetrical LLC Resonant LED Driver with Low Voltage Stress Across Switching Devices

Kim¹,

Kim²,

Kim³

et al. 2015

Journal of Electrical Engineering and Technology

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-In the LED lighting industry, the dimming function in the LED lamp is required by demands of many consumers. To drive this LED lighting, various types of power converters have been applied. Among them, an LLC resonant converter could be applied for high power LED lighting because of its high efficiency and high power density, etc. The function of power factor correction (PFC) might be added to it. In this paper, a dimmable single-stage asymmetrical LLC resonant converter is proposed. The proposed converter performs both input-current harmonics reduction and PFC using the discontinuous conduction mode (DCM). Also, the lower voltage stress across switching devices as well as the zero voltage switching (ZVS) in switching devices is realized by the proposed topology. It can reduce cost and has high efficiency of the driver. In addition, the regulation of the output power by variable switching frequency can vary the brightness of a light. In the proposed converter, one of the attractive advantages doesn't need any extra control circuits for the dimming function. To verify the performance of the proposed converter, simulation and experimental results from a 300W prototype are provided.

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“…16. The THDs are 19.07% (at load variation 100%), 16.51% (at 72%), 20.34% (at 58%), 19.07% (at 44%), 25.71% (at 41%), 25.71% (at 33%) and 25.71% (at 32%), respectively.…”

Section: The Experimental Resultsmentioning

confidence: 99%

“…This dimming function can be achieved by changing the reference figure [16]. However, this dimming technique needs a photocoupler.…”

Section: Introductionmentioning

confidence: 99%

The Dimmable Single-stage Asymmetrical LLC Resonant LED Driver with Low Voltage Stress Across Switching Devices

Kim¹,

Kim²,

Kim³

et al. 2015

Journal of Electrical Engineering and Technology

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show abstract

“…Another way to dimerize an LED is by continuous current variation. However, as noted in [8] and [10], PWM dimming is more suitable because in this case rated current is applied to the LED in all times, changing only the fraction of time during which current flows in each period (duty cycle).…”

Section: Led Drivermentioning

confidence: 98%

“…As the luminous intensity of LEDs is directly related to the direct current flowing through them, this source must have characteristics of current source [8]. The circuit used to control the LED current and brightness is called LED driver, shown in Figure 5.…”

Section: Led Drivermentioning

confidence: 99%

Intelligent power LED lighting system with wireless communication

Matoso

Morais

Cortizo

et al. 2012

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society

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This paper presents the design and implementation of an intelligent lighting system using power LEDs. The developed system is able to operate under normal power supply through power grid, as well as in the absence of supply, consisting in the emergency mode. The choice of power LEDs as light source is mainly due to long lifetime and high luminous efficiency of these components, features highly desirable in lighting systems, especially in emergency lighting systems. The system is provided with intelligence implemented in a microcontroller, and is ca pable of decision making and energy consumption optimization.The system has wireless communication with a remote device via Bluetooth ® specification. Through this wireless link, it is possible to have total control of the light intensity, as well as obtaining information about the battery status and the duration of interruptions.

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“…É importante lembrar ainda que LEDs, devido ao seu tamanho compacto, geralmente possuem uma pequena área para dissipação térmica, sendo necessária a utilização de um dissipador de calor com área adequada. [23] Em [24], reforça-se a influência da temperatura na vida útil do LED. Para um determinado LED (LED Luxeon K2 Philips), as curvas de variação do fluxo luminoso em relação à quantidade de horas de uso com uma corrente fixa para três temperaturas de junção diferentes são mostradas na Figura 2.19.…”

Section: Figura 215 -Características Elétricas De Um Led [20]unclassified

Avaliação dos impactos da tecnologia LED e técnicas de gestão de iluminação pública em redes de distribuição

Pinto¹

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Primeiramente, agradeço à minha família por todo suporte que recebi. Agradeço às falecidas Sandra e Arlete, que mesmo não estando presente fisicamente, sempre estiveram presentes no coração. À Shirlei, por toda força e batalha para que eu tivesse tudo o que houvesse de melhor. À Raquel, por todo o companheirismo e amizade durante a vida. Agradeço ao meu orientador Luiz por toda compreensão, paciência, conhecimentos e excelente orientação. Ao meu coorientador Paulo pela ajuda que recebi e que elevou a qualidade deste trabalho.Agradeço ainda à Ana Luiza, por todo apoio incondicional que recebi durante os anos de graduação. À querida Maria de Fátima, pelo suporte e conselhos. À Vanessa, por me mostrar outros lados da vida. Agradeço ao Cristian e ao Tarupó que, ao segurarem minhas mãos nas noites de terça-feira, ensinaram-me sobre ternura, acolhimento e fé. Agradeço à espiritualidade que me acompanha.Agradeço a todos os meus grandes amigos Guilherme, Ivan, Talita, Alan Eduardo,

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Comparative analysis of power LEDs dimming methods

Cited by 16 publications

References 7 publications

The Dimmable Single-stage Asymmetrical LLC Resonant LED Driver with Low Voltage Stress Across Switching Devices

The Dimmable Single-stage Asymmetrical LLC Resonant LED Driver with Low Voltage Stress Across Switching Devices

Intelligent power LED lighting system with wireless communication

Avaliação dos impactos da tecnologia LED e técnicas de gestão de iluminação pública em redes de distribuição

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