• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.411-414
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• 1999

This paper presents design and analysis of an HID lamp ballast for a fast turn on characteristics and stable operation. It produces a high open circuit voltage for the ignition and it is controlled to supply effectively the power required to shorten the warm-up period after the breakdown. The lamp modeling by empirical data is presented. It is very effective in the designing of the control loop in the steady-state operating region. A stable operation of the lamp power regulation in the steady state is achieved, which is crucial for the long life time and constant light output. Stability analysis of the system is performed and the results are verified through various simulation results and the hardware experiments.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.119-121
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• 2005

The problem of lamp life have being solved before electrode-less lamps were developed. But, mercury is using till now. So people are concerned about friendly-environmental lamp, and many researcher hardly study it. In this paper, an ICP lamp which is using Xe gas and Ne gas was designed after optical properties were measured and analyzed. As a result, H-mode properties and penning effect properties were known. Also xenon and neon of properties analyze by spectrum.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.241-244
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• 2002

This paper presents the electronic ballast for the metal halide lamp with free voltage input and implemented for CDM-T[150W] lamp. HID lamps have a good color rendition, long life and good focusing capability but they have fickers by acoustic resonance when driven at high frequency. To reduce the acoustic resonance phenomena, the electronic ballast was designed for high frequency operation with the constant frequency sinusoidal wave of 75[kHz]. Finally, the experimental results on the ballast of CDM-T [150W]metal halide lamp with the propose methods are discussed.

• 전기학회논문지
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• 제58권10호
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• pp.1947-1953
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• 2009

Metal halide (MH) lamps have been largely used due to high luminous efficiency, good color rendering, and long life. Since the metal halide lamps have problems of high ignition voltage and acoustic resonance. Thus, the design of ballast is very difficult for engineers. This paper proposes prototype of electric ballast in order to solve above two problems. The proposed electric ballast is consisted of EMI filter, full wave rectifier circuit, active PFC, DBI(Dual Buck Inverter), dimming circuit and ignitor circuit. The DBI supplies both rectangular voltage and current to the lamp. As the result of the experiment, the acoustic resonance was eliminated and the ignitor circuit was designed to generate high ignition voltage than 5kV. It makes the dimming circuit possible to control the lamp power in range between 230W and 350W.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.2190-2192
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• 2005

Discharge of the flat lamp lighting source research are requested very much. For improving brightness, life time, efficiency of flat lamp, plasma diagnosis of the flat lamp lighting source to understand property of lighting source is very important. distance of discharge electrode is 5.5mm and width is 16.5mm, we measured electron temperature and electron density measured with single langmuir probe in flat lamp. we tested the discharge from 100 Torr to 300 Torr pressure. the Pulse is rectangular pulse with frequency 20kHz and Duty ratio 20%. Resultly, electron temperature decreases and electron density increase as increase the gas pressure and electron temperature decreases and electron density increase as increase the voltage.

• 생물환경조절학회지
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• 제27권2호
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• pp.158-165
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• 2018

종류가 다른 보광등과 난방등으로 보광을 해 주었을 때, 절화 장미의 수확량, 절화수명, 엽색에 미치는 영향을 비교 분석하였다. 이를 위하여 보광등으로 LED등(Light emitting diode lamp, LED), 메탈할라이드등(Metal halide lamp, MH), 고압나트륨등 (High-pressure sodium lamp, HPS)과 난방등으로 나노탄소섬유 적외선등 (Nano-carbon fiber infrared lamp, NCFI)을 절화장미를 재배하고 있는 농가의 수경재배 베드 위에 설치하였다. 절화 장미 수확량과 판매 가능한 절화수는 HPS 처리에 의해 봄과 가을에 크게 증가하였다. 품질의 주요기준이 되는 절화장은 봄철에는 전등처리에 의해 대조구보다 길어졌으나, 겨울에는 오히려 감소하였다. 겨울에는 전등처리로 인해 개화가 촉진되어 영양생장기간이 상대적으로 짧아졌기 때문으로 생각된다. 절화수명은 전등 처리시간이 짧은 가을에는 처리간 차이가 보이지 않았으나, 겨울에는 HPS에서만 대조구에 비해 3일 정도 길어졌다. 엽색은 가을철 보다는 겨울철에 전등처리의 영향을 크게 받았으며, 모든 보광등(LED, MH, HPS)처리에서 엽색이 짙어진 반면, 난방등으로 이용되고 있는 NCFI에서는 대조구와 비슷한 밝기였다. 결론적으로, HPS는 절화장과 절화수명을 길게하며, 수확량도 증가시키므로 매우 좋은 보광등이라고 판단되었다. NCFI는 발열양이 많기 때문에 난방등으로의 기능은 충분할지라도 판매 가능한 절화수가 감소하고 품질지수가 저하되기 때문에 보광등으로서의 역할은 미약할 것으로 판단되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기물성,응용부문
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• pp.312-315
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• 2003

In recent, there have been several developments in lamp technology that promise savings in electrical power consumption and improved quality of the lighting space. Above all, the advantage of ring-shaped electrodeless fluorescent lamp is the removal of internal electrodes and heating filaments that are a light-limiting factor of conventional fluorescent lamps. The ring-shaped electrodeless lamp is intended as a high efficacy replacement for the incandescent reflector lamp in many applications. Therefore, the life time of ring-shaped electrodeless fluorescent lamps is substantially higher than that of conventional fluorescent lamps and last up to 60,000 hours. In this paper, maxwell 3D finite element analysis program (Ansoft) was used to obtain electromagnetic properties associated with the coil and nearby structures. The electromagnetic emitting properties were presented by 3D simulation software operated at 250[kHz] and some specific conditions.

• 수산해양기술연구
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• 제51권2호
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• pp.163-170
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• 2015

Recently LED fish-attracting lamps have been more widely used in fisheries as low-cost and high-efficiency fishing gear, and development of long-life high-efficiency lamps is required through the design of LED packages to optimize heat resistance. This study developed an improved LED fish-attracting lamp with excellent heat performance, which was verified using a numerical model. Heat-resistance design factors such as the heat-radiation fin shape, PCB type, and LED chip count were investigated and optimized. Comparison with a commercial 180-W LED fishing lamp showed that the increase in initial temperature was 40% higher than that of the surrounding LED chip because of design errors in contact thermal resistance. The 250-W LED lamp developed in this study has a characteristic with thermal rising in linearly stable according to the heat source. In addition, luminance efficiency was improved by 20-65% by using flow-visualization simulation. A decrease of 45% in total power consumption with a fuel-cost reduction of over 55% can be expected when using these optimized heat release design factors.

• Transactions on Electrical and Electronic Materials
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• 제8권6호
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• pp.268-273
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• 2007

In this study, It was studied about the luminance characteristics of 17 inch direct-type back light using EEFL(external electrode fluorescent lamp) and CCFL(cold cathode fluorescent lamp). The EEFL has a long life time because the electrode is installed outside of lamp. And it is produced in lower price than conventional CCFL. Moreover, it does not need process of installing internal electrode. However, the EEFL technology has several problems such as difficulty of designing driving inverter and preventing this phenomenon along the skin of lamps. We suggested two types of backlight unit for LCD TV application using the EEFL and the CCFL. We found optimized optical design parameters. We set the optical variation parameters such as lamp height, lamp distance, total thickness, and angles of inner walls. We achieved 7580 nits of center luminance, 82% of luminance uniformity by using 20 lamps of the EEFL and 7297 nits of center luminance, 78% of luminance uniformity by using 16 lamps of the CCFL.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기물성,응용부문
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• pp.220-221
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• 2006

In recent, there have been several developments in lamp technology that promise savings in electrical power consumption and improved Quality of the lighting space. Above all, the advantages of ring-shaped electrodeless fluorescent lamp are the removal of internal electrodes and heating filaments that are a light-limiting factor of conventional fluorescent lamps. Therefore, the life time of ring-shaped electrodeless fluorescent lamps is substantially higher than that of conventional fluorescent lamps last up to 60,000 hours, There are intended as a highly efficient replacement for the incandescent reflector lamp in many applications. In this paper, maxwell 3D finite element analysis program (Ansoft) was used to obtain electromagnetic properties associated with the coil and nearby structures. The electromagnetic emitting properties were presented by 3D simulation software operated at 250 kHz and some specific conditions. In addition, the optical characteristics of ring-shaped electrodeless fluorescent lamp were measured including light flux, efficiency and color temperature for each case.