• Title/Summary/Keyword: 황명근

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The characteristics research of lifetime for metal-halide and led lamp (메탈핼라이드 램프와 LED램프 수명특성 분석연구)

  • Lee, Se-Hyun;Shin, Sang-Wuk;Rho, Jae-Yup;Kwon, Ki-Tae;Choi, Seok-Joon;Lee, Jeong-Keun;Seo, Jeong-Jin;Lee, Gyu-Seoung;Hwang, Myung-Keun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.10a
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    • pp.85-88
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    • 2009
  • In this paper, We has been studied the lifetime degradation of LED lighting system compared to MH lighting. Especially the effect of temperature level on the lifetime degradation has been investigated. The results show that temperature plays a role in the lifetime degradation and slope of degradation line represent as temperature level differently. However, It is possible to estimate the lifetime of LED lighting system using equation induced the slope of degradation line.

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Evaluation of White LED Package Characteristics in Remote Phosphor Structure Depending on Phosphor Coatings (형광체 코팅에 따른 Remote Phosphor 구조의 백색 LED 패키지 특성 평가)

  • Jeong, Hee-Suk;Lee, Jung-Geun;Kang, Han-Lim;Hwang, Myung-Keun;Lee, Mi-Jae;Kim, Jin-Ho;Chae, Yoo-Jin;Lee, Young-Sik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.4
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    • pp.330-334
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    • 2013
  • We developed a package of remote phosphor structure having blue LED chips and phosphors physically separated, and the characteristics were evaluated according to different classifications of phosphor coatings. Remote phosphor was produced by screen printing coating on glass substrate with phosphor content rated paste and heat treatment. After mounting Remote phosphor, which has been classified according to number of coatings, on top of blue LED chips, luminous flux, luminous efficacy, CCT and CRI were measured. The measurement results showed the most suitable characteristics of white LED package as a general light source when the content rate of phosphor in Remote phosphor was 80 wt.% with 3 layers of coatings and thickness over $12{\mu}m$.

A Trend of the National and International Standards for Fluorescent Induction Lamps (무전극 형광램프 국내외 표준화 동향)

  • Cho, M.R.;Shin, S.W.;Lee, S.H.;Hwang, M.K.;Lee, D.Y.;Yang, S.Y.;Ham, J.K.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.145-147
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    • 2007
  • Fluorescent induction lamps are assembly of a Low Pressure Mercury discharge vessel and an inductive power coupler. A vessel containing at least a Low Pressure Mercury vapor, which will be energized by means of the Inductive Coupler. The Ultra Violet radiation from the resulting discharge is converted by a layer of fluorescent material into visible light. The discharge vessel may have means of mechanical fixation to position it to the Inductive power coupler. The component to transform High Frequency electrical energy, by means of induction, in order to energize the Low Pressure Mercury in the discharge vessel. The component includes electrical connection. Fluorescent induction lamps don't have international standards yet. So we try to correspond Korea standards to international standards.

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Manufacturing and Experimentation of The Reference Lamp for PLS New Light Source (PLS 신광원의 부 표준램프의 제작 및 실험)

  • Hwang, Myung-Keun;Lee, Se-Hyun;Shin, Sang-Wuk;Cho, Mee-Ryoung;Yang, Seong-Yong;Jung, Kwan-Jin;Bae, Young-Jin
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.157-159
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    • 2007
  • 광속구에서 광원(light source)의 광속(luminous flux)을 측정할 때, 통상적인 측정환경의 변화는 보조램프(aux. lamp)를 사용하여 그 차이를 보정할 수 있다. 그러나 PLS(plasma lighting system)와 같이 표준광원과 시료광원의 위치가 크게 다를 경우에는 그에 따른 광속변화를 직접 측정하고 보정계수를 산출 반영하거나 시료광원의 측정위치와 동일한 위치에서 Calibration을 시행해야 할 것이다. 따라서 본 논문에서는 광속구에서의 기존 광원의 광학적 특성치를 통하여 새롭게 개발되는 광원류에 대한 부 표준램프를 제작 실험한 결과를 제시한 것이다. 광속구에서의 광특성은 센터와 사이드 측정방식에 의한 특성결과치를 기준으로 보정계수를 구하고 부 표준램프를 제작하였다.

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Comparison of Chromaticity coordinate and Dominant wavelength for General R/G/B/W LEDs Light Source (R/G/B 및 백색 LED광원의 색도좌표와 주파장의 비교 고찰)

  • Hwang, Myung-Keun;Cho, Mee-Ryoung;Shin, Sang-Wuk;Lee, Se-Hyun;Lee, Joo-Sung;Jung, Bong-Man
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.166-169
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    • 2007
  • 최근에 정부의 "15/30 LED조명 보급정책"에 힘입어 개발된 8W급 조명용 LED광원의 CIE 색도좌표 (chromaticity coordinate)와 주파장(dominant wavelength)등을 측정 고찰 하였다. 적색(R), 녹색(G), 청색(B), 백색(W)순으로 주파장은 각각 620[nm], 531[nm], 465[nm], 579[nm]이고, 자극순도(excitation purity)는 0.98, 0.82, 0.97, 0.15이며, 휘도순도(colorimetric putity)는 45[%], 16[%], 279[%], 6[%]로 나타났다. Power LED의 최적배치 설계로서, 특히 백색 LED광원의 경우 백열전구(15 lm/W)에 비해 3배 이상의 높은 효율(47.71m/W)을 보였고, 배광측정에서는 78.7%의 효율로 나타났다. 현재 LED광원은 MR16이나 베이스 타입 등의 형태로 제작하여 스탠드, 복도등, 비상유도등, 침실용 등의 용도에 사용되고, 일부는 LED의 원형이나 면(flat)타입으로 가로등이나 투광등으로도 활용되고 있다. 따라서 이들에 대한 각각의 특성들을 제시해 둘 필요성인 인지되어 국내 최초로 개발된 R/G/B/W 8W급 LED광원에 대한 기본적인 광특성 결과를 얻었으며, 이중에서 HB 백색 LED램프의 색도좌표 값을 얻어 CIE표준광과의 색도좌표(x, y) 위치를 비교 검토할 수 가 있었다.

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A Study on Ceramic Arc-tube Metal Halide Lamp for 150W Class (150W급 세라믹 아크튜브에 관한 연구)

  • Rho, Jae-Yeop;Hwang, Myung-Keun;Shin, Sang-Wuk;Lee, Se-Hyun;Yi, Chin-Woo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.121-125
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    • 2008
  • 최근들어 메탈핼라이드램프의 아크튜브에 사용되던 석영관을 내열성 및 내식성이 우수한 alumina ceramic 재질의 아크튜브에 교체한 세라믹 메탈핼라이드램프가 개발되었다. 이러한 세라믹 메탈핼라이드램프는 기존 석영관 메탈핼라이드램프에 비해 고효율, 고연색성 및 장수명 등 우수한 특성을 가지고 있어 램프의 compact화를 통해 150W이하의 옥내 상업용 조명시설에 급속한 보급이 이루어지고 있으며 국내에서도 이러한 세라믹 메탈핼라이드램프 개발을 위한 연구가 진행 중이다. 이에 본 논문에서는 국내 세라믹 메탈핼라이트램프(Ceramic Metal Halide lamp)의 개발에 필요한 국외 선진 제품에 대한 특성 DB구축을 위하여 150W급 세라믹 메탈핼라이드램프의 아크튜브 구조 및 치수를 측정하고 weibull++6을 이용한 성능열화데이터 분석을 통해 세라믹 메탈핼라이드램프의 수명을 예측해 보았다.

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The Characteristics Analysis of substitute LED and CNT Lighting for fluorescent lamp (형광등 대체용 LED조명과 CNT조명에 대한 전기적.광학적특성의 비교고찰)

  • Hwang, M.K.;Lim, J.M.;Shin, S.W.;Rho, J.Y.;Cho, M.R.;Lee, S.H.;Jeon, S.K.;Choi, S.J.;Yi, C.W.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.205-208
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    • 2008
  • In this paper, we have measured and compared the optical and electrical characteristics of LED(light emitting diode) and CNT(carbon nano-tube) lightings. Especially, the IES format files are used for each of the luminaire LlD(luminous intensity distribution) analysis and light level simulation for analyze the maximum, minimum, and average light level. In the future, when CNT and the LED based lighting technology standards are writing, this data will be used in judging.

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Emission Properties of Electrodeless Sulfur Lamp by Additives (화합물 첨가에 따른 무전극 황램프의 발광특성)

  • Lee, Jong-Chan;Kim, Kwang-Soo;Park, Dae-Hee;Hwang, Myung-Keun;Park, Cheol-Soon
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1890-1892
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    • 2002
  • The technology of sulfur lamps that has physical and electrical characteristics comparable to current HID source has been reported. The fundamental principles of the operation of microwave discharges that are used to convert microwave energy to broad spectrum visual light are known. In this paper, emission dependance of microwave discharges in mixture content of sulfur with noble gases was studied. It is shown that the excitation of this gaseous mixture is carried out in two phases: (l) ionization of noble gas atoms by a microwave field and (2) the consequent maintenance of slightly ionized nonequilibrium plasma by the field. These two processes have essentially various thresholds for the microwave pump. The purpose of this work is to investigate spectral properties of the high frequency discharges in a mixture sulfur vapors with noble gases.

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Optical and electrical characterization for Ceramic Metal Halide Lamps (세라믹 메탈헬라이드램프의 전기적, 광학적 특성에 관한 연구)

  • Rho, J.Y.;Yang, S.Y.;Hwang, M.K.;Lim, J.M.;Shin, S.W.;Lee, S.H.;Yi, C.W.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.10a
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    • pp.81-84
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    • 2008
  • 1960년대 중반부터 이미 고압 나트륨램프에 사용되어 오던 반투명의 세라믹 재료(Polycrystalline Ceramic Alumina ; PCA)를 기존 메탈핼라이드램프의 석영(Quartz) 발광관에 적용시킨 세라믹 메탈핼라이드(Ceramic Metal Halide ; CMH) 램프는 1995년 처음 소개된 이래 색 제어, 연색성, 광속유지율 등에서 전통적인 석영 메탈핼라이드(Quartz Metal Halide ; QMH)램프보다 우수한 특성을 가지고 있어 저와트급(150W이하)에서 고와트급에 이르기까지 폭넓게 사용되어지고 있으며 현재 국내에서도 이러한 CMH램프의 개발이 진행 중이다. 본 논문에서는 CMH램프의 우수한 특성을 살펴보기 위하여 국외 선진제품에 대한 전기적, 광학적 특성을 살펴보았으며 실험 결과 CMH 램프의 광속유지 율이 기존 QMH 램프보다 우수한 특성을 갖는 것을 확인할 수 있었다.

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Development and Application of A Computer-Based Integrated Data-Acquisition System for PV System Monitoring (태양광발전용 컴퓨터기반의 집속화된 데이터 취득 시스템의 개발 및 적용)

  • Yoo, H.C.;Song, J.Y.;Hwang, M.K.;Huh, C.S.
    • Journal of the Korean Solar Energy Society
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    • v.22 no.3
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    • pp.67-76
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    • 2002
  • Data-Acquisition systems are widely used in Photovoltaic(PV) system application in order to analyze and optimize the performance of PV systems. In this paper, the development of a computer-based data-acquisition system and its application are described. The proposed Computer-based data-acquisition System consists of a set of sensors for measuring both environmental and electrical parameters. The collected data are first conditioned and then interfaced to PC using a data-acquisition card. The Labview program was used to further process, display on the monitor at real time and store on the hard disk. We designed and installed two stand-alone PV systems to supply different loads, which in this case a Low Pressure Sodium(LPS) 55 [W] lamp and a electrodless 55 [W] lamp. When the proposed data acquisition system is applied on the designed PV systems, Optimized system operation methods are investigated to confirm a stable load availability and extend battery life time.