• 제목/요약/키워드: High-Power LED

검색결과 605건 처리시간 0.024초

태양광 전원을 이용한 조명용 LED 구동회로 설계 (The design of illumination LED drive circuit using photovoltaic electric power)

  • 변문걸;박정국;최석조;장용해;이성길;백형래;조금배
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2007년도 하계학술대회 논문집
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    • pp.67-68
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    • 2007
  • The introduction of high brightness LEDs with white light and monochromatic colors have led to a movement towards specialty and general illumination applications. Because drive circuit of illumination LED has an effect on efficiency and life, research about the drive circuit following LED characteristic is needed. This paper proposed a implementation of the stand-alone LED lighting system using battery from photovoltaic power generation.

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Design of a Converter with Anti-blinking Circuitry for T5 LED Indirect Lighting

  • Woo-young, Kim;Quoc Cuong Nguyen;Seong-Kweon Kim
    • International Journal of Internet, Broadcasting and Communication
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    • 제16권2호
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    • pp.103-111
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    • 2024
  • We address the problematic issue of blinking in residential LED lighting systems-a phenomenon that has recently become a significant concern due to voltage sags caused by high-power household appliances. To combat this, we developed a two-stage LED converter with integrated anti-blinking circuitry, specifically designed for T5 LED indirect lighting fixtures. The first stage employs a Power Factor Correction (PFC) boost circuit to enhance voltage stability by aligning the voltage and current phases, thereby minimizing power losses. The second stage, a meticulously engineered DC-DC buck converter, ensures stable lighting despite electrical fluctuations. Rigorous testing has confirmed our converter's efficacy in maintaining consistent light output without blinking, thereby substantially improving user comfort and adhering to strict standards for harmonic distortion and electromagnetic compatibility. Our breakthrough provides a robust solution to a pressing issue, marking a significant advancement in LED lighting technology.

슬림형 LCD TV의 LED 백라이트 구동용 평판형 트랜스포머를 적용한 LLC 공진컨버터에 관한 연구 (A Study on LLC Resonant Converter using the Planar Transformer for the LED Backlight of Slim-Type LCD TV)

  • 손호인;김창선;김대년
    • 전력전자학회논문지
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    • 제15권4호
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    • pp.319-326
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    • 2010
  • LCD TV의 슬림화를 위한 전원장치는 고효율 및 고전력 밀도를 요구하고 있다. 최근 LCD TV의 LED 백라이트는 소비전력이 매우 적고 수명이 반영구적이며 밝기가 뛰어나는 동시에 기존의 CCFL 보다 적은 공간을 차지해서 두께를 혁신적으로 줄일 수 있는 장점을 지니고 있다. 그리고 본 논문에서는 LED 백라이트 구동용 고주파 평판형 트랜스포머를 이용하여 LLC 공진컨버터를 제안 적용하였고 실험 결과에 대하여 서술한다.

BFS 알고리즘을 적용한 독립형 가로등 LED 사용시간 연장 알고리즘 연구 (A study on the algorithm for extending the usage time of a stand-alone street light LED using the BFS algorithm)

  • 김재진
    • 디지털산업정보학회논문지
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    • 제17권1호
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    • pp.1-6
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    • 2021
  • In this paper, to expand the use of standalone street lights, an algorithm for controlling LED energy consumption was proposed. The proposed method uses an LED module of a standalone street light divided into n zones. This is a method of reducing total power consumption by preventing the increase in power consumption due to high heat generation by weakly operating the entire LED according to the illuminance. When the amount of sunlight decreases, the whole LED operates weakly and then brightens, and unlike streetlight that act as streetlight, a method of dividing LEDs by area and limiting the number of LEDs operating according to illumination intensity was proposed. This is a way to use a lot of time with limited battery capacity by reducing the generation of heat that consumes the most power in streetlight. It is also a method of continuously changing the initial usage area to improve the total usage time of the LED substrate. As a result of the experiment, it was found that the proposed method extends the service time because it generates less heat than the conventional stand-alone streetlight.

Optical Design of Multimedia-Embedded LED Dental Astral Lighting using the Reverse Dual Reflector Method

  • Kwon, Young Hoon;Hwang, Hyo Chang;Jun, Hwa Joon;Kwon, Jin Hyuk
    • Journal of the Optical Society of Korea
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    • 제19권4호
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    • pp.409-414
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    • 2015
  • Light-emitting diodes (LED) have many advantages for dental astral lighting because of their high color rendering index (CRI), low power consumption, light weight and longer life. A dental astral lamp is specially designed and simulated for securing the extra space for installing a multimedia display that will be helpful for treating young patients. The optical system using the reverse dual reflection method consisted of four illumination modules disposed at the four corners of the dental astral lamp, and each module comprises a high power LED, an elliptical mirror, and a multifacet reflector assembly using eight cylindrical mirrors. It is shown that the required illuminance, illumination pattern, and the illumination uniformity are well satisfied.

습식식각공정에 의한 High Speed용 AlGaAs/GaAs 적외선 LED 소자의 특성 (The Properties of High Speed AlGaAs/GaAs Infrared LED by using Metal wet etch process)

  • 이철진;라용춘;성만영;이은철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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    • pp.352-354
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    • 1995
  • The optical and electrical properties of High Speed AlGaAs infrared LED by using metal wet etch process instead of metal lift-off process are investigated. The power out increases when metal contact is patterned by wet etch process. Forward voltage and Reverse voltage for metal wet etch process represent higher value than the metal lift-off process. The aging effect of power out also indicates good results with wet etch process. The wet etch process for metal contact reveals reliable LED device properties.

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가시광 통신 시스템을 위한 고효율 스위치모드 LED 구동회로 (High Efficiency Switch-Mode LED driver for Visible Light Communication System)

  • 강정민;조상호;홍성수;한상규;사공석진
    • 전력전자학회논문지
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    • 제16권4호
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    • pp.358-365
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    • 2011
  • LED는 친환경적 특성, 긴 수명, 우수한 효율 등의 장점이 있어 최근 기존의 백열전등 및 형광등을 대체하는 조명 수단으로 각광받고 있다. 또한, LED는 전기를 빛으로 변환하는 속도가 굉장히 빠른 반도체로 정보의 변조 및 인코딩이 용이하기 때문에 통신 소자로서 활용이 가능하다. 이를 이용하여 기존의 조명 기능을 수행함과 동시에 부가적으로 근거리 무선 통신을 수행하는 것을 가시광 통신 시스템이라 한다. 기존의 전압원 구동 가시광 통신 시스템의 경우, 스위치의 선형 영역 구동으로 인해 전력 변환 효율의 저하 및 발열이 심각하였다. 본 논문에서는 스위치를 스위칭 영역에서 구동시킴으로써 전력 변환 효율과 발열의 획기적인 개선이 가능한 고효율 스위칭 방식의 LED 드라이버를 제안한다. 또한 3MHz 무선 오디오 통신 시스템에 제안된 20W급 LED 드라이버를 적용하여 그 타당성을 검증한다.

백색 레이저 조명용 Y3Al5O12:Ce3+,Pr3+ 단결정 특성 (Properties of Y3Al5O12:Ce3+,Pr3+ Single Crystal for White Laser Lightings)

  • 강태욱;임석규;김종수;이봉
    • 반도체디스플레이기술학회지
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    • 제17권4호
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    • pp.37-41
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    • 2018
  • $Y_3A_{l5}O_{12}:Ce^{3+},Pr^{3+}$ single crystal phosphor was prepared by floating zone method. single crystal was confirmed to have a Ia-3d (230) space group of cubic structure and showed regular morphology. The optical properties, single crystal exhibited a emission band from green, yellow wide wavelength and 610nm, 640nm red wavelength vicinity. The luminance maintenance rate was decreased by phonon with increasing temperature, but high luminance is maintained more than powder phosphor. In addition, $Y_3A_{l5}O_{12}:Ce^{3+},Pr^{3+}$ single crystal phosphor was applied to a high power blue laser diode, we implemented high power white laser lightings. and it was confirmed that thermal properties over time, due to the effective heat transfer of complete crystal structure. We confirmed that excellent radiant heat properties than powder phosphor was applied to a high power white laser diode.

Nitride Phosphors for the Better Performance of WLEDs

  • Yoon, Chul-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.49-49
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    • 2009
  • Phosphors with oxide host material, YAG:$Ce^{3+}$ and $(Ca,Sr,Ba)_2SiO_4:Eu^{2+}$ yellow phosphor, has been used for LED applications. The WLEDs using these phosphors are widely used for LCD backlighting, automobile, and general lighting applications since they have high conversion efficiency and good thermal and chemical stability which can meet necessary life time of LED products up to now. With advances of LED chip technology, the external quantum efficiency and driving current in chip get higher so that the phosphors for high power chip are required to maintain high conversion efficiency and stability at high temperature due to the heat dissipated from LED chips. In addition, higher color rendering index of LED lighting and color reproducibility of LCD than those of LEDs with single yellow phosphors are required. In order to overcome these technical issues rising from evolution of LED technology, new phosphors are in demand and nitride phosphors, one of the promising new candidate materials, will be discussed here.

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