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둥근형 무전극 램프의 페라이트 코어와 냉점의 온도 의존성
장혁진,양종경,김남군,정영일,박대희,Jang, Hyeok-Jin,Yang, Jong-Kyung,Kim, Nam-Goon,Jung, Young-Il,Park, Dae-Hee 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12
Generally Lighting system consists of lamp and luminaire. When a fluorescent lamp is installed in luminaire, power and light output is changed by ambient temperature. Particularly electrodeless lamp depends on the changes that are mercury pressure with amalgam temperature and magnetic properties with ferrite temperature. It has finally influence on optical efficiency. In this study, the temperature change of ferrite and cold spot, vessel are measured at transitional state and then same characteristics are measured with increase of ambient temperature. At transitional state, luminous flux is related to temperature change of cold spot that compare with behavior of mercury pressure and light output. At increase of ambient temperature, we analyzed change that efficiency and electrical, optical characteristics of elecrodeless lamp are related to ferrite core and cold spot temperature.
구동방법에 따른 세라믹 메탈 할라이드 램프의 전기적 및 방전특성 분석
장혁진(Hyeok-jin Jang),양종경(Jong-Kyung Yang),김남군(Nam-Gon Kim),박대희(Dae-Hee Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The use of arc tubes made of ceramic material further enhanced some of the metal halide lamp's properties. These properties translate into higher efficacy with better color rendering, stable color through lamp long life. Recently, due to an increase in the application of the ceramic metal-halide lamp, the study for the property etc. according to Ballast's driving scheme and the study for arc tube material, optimization of gas and so on are being proceeded to improve the property of the lamp. Especially, to control ceramic metal-halide lamp, the vigorous study and practical use with respect to Electronic Ballast, which has been improved in the disadvantages of the conventional Magnetic Ballast are made. In this paper, Electrical characteristics and gas insulation destroy time are analyzed by comparing magnetic ballast with electronic ballast.
아크튜브내의 구성물 손실이 세라믹 메탈 핼라이드 램프의 특성에 미치는 영향분석
장혁진(Hyeok-Jin Jang),양종경(Jong-Kyung Yang),박대희(Dae-Hee Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.12
A Ceramic Metal-halide lamp is achieved by adding multiple metals to a basic mercury discharge. Because the vapor pressure of most metals is very much lower than mercury itself, metal-halide salts of the desired metals, having higher vapor pressures, are used to introduce the material into the basic discharge. The metal compounds are usually polyatomic iodides, which vaporize and subsequently dissociate as they diffuse into the bulk plasma. Metals with multiple visible transitions are necessary to achieve high photometric efficiency and good color. Compounds of Sc, Dy, Ho, Tm, Ce, Pr, Yb and Nd are commonly used. The maximum visible efficacy of a Ceramic Metal Halide lamp, under the constant of a white light source, is predicted to be about 450㏐/W. This is controlled principally by the chemical fill chosen for a particular lamp. Current these lamps achieve 130㏐/W and these life time are the maximum 16,000[hr]. So factors of performance lower are necessary to improve lamp performance. In this paper, we analyzed factors of performance lower by accelerated deterioration test. The lamp was operated with short duration turn-on/turn-off procedure to enhance the effect due to electrode sputtering during lamp ignition. The tested lamp that was operated with a longer turn-on/off(20/20 minutes) showed blackening, changed distance between electrodes and lowered color rendering & color temperature by losses of Dy at 421.18㎚, I at 511㎚, Tl at 535㎚ and Na at 588nm compared with the new lamp.
음향 공명 현상을 고려한 세라믹 메탈핼라이드의 특성 분석과 PSpice 시뮬레이션을 통한 인버터 설계
장혁진(Hyeok-Jin Jang),김남군(Nam-Goon Kim),양종경(Jong-Kyung Yang),이종찬(Jong-Chan Lee),박대희(Dae-Hee Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.10
This study purposes are improvement of system (lamp & ballast) efficacy with and optical characteristics through the developed ceramic arc tube. The designed electronic ballast is substituted for conventional magnetic ballast. These electric signal and optical, thermal characteristics through the improving efficacy of lighting system compared with conventional magnetic ballast. properties of lamp by driving method is researching in ballast. Particularly, electronic ballasts, which improved against weakness of Magnetic Ballast, are researching and applying to control of ceramic metal-halide lamp. but One major limitation is the acoustic resonance problem in CMH lamps at high-frequency operation. In order to avoid acoustic resonance, driving frequency decided 21[kHz]. Before discharge in this paper. The PSpice simulation result obtained sufficient voltage gain and the ignition voltage obtained over 3[kV] at 75[kHz]. After discharge, driving voltage obtained approximately 90[Vrms] at 21[kHz].