• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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• pp.834-838
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• 2004

This paper presents the structure of a dimming control system for multiple fluorescent lamps. The dimming control system is composed of a phase angle controller, a transducer, and dimmable ballasts. In these ballasts, dimming control is achieved by varying the switching frequency that is controlled by the external DC level.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.965-968
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• 2007

The effect of the modification of the front surfaces of flat fluorescent lamps (FFLs) on the light-output distribution has been investigated by using a ray tracing method and several kinds of microlenses. It was found that microlenses have substantial effects on the light-output distribution, which might be used to reduce the number of optical films in the FFL-backlight unit for LCD applications.

• Journal of the Optical Society of Korea
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• 제11권3호
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• pp.118-123
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• 2007

The emitting structure of multi-channel-type flat fluorescent lamps (FFLs) combined by a lenticular-lens-patterned diffuser plate was optimized by the ray tracing technique. The optimal parameters such as the distance between the channels of the FFL and the distance between the FFL and the diffuser plate were suggested from the viewpoint of the luminance uniformity. The best luminance uniformity, which was higher than 90%, was obtained at the channel distance of 4 mm and the distance of 12.5 mm between the FFL and the patterned diffuser plate.

• 산업기술연구
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• 제17권
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• pp.175-182
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• 1997

Various types of electronic starter have been developed for the general fluorescent lamps with magnetic-type ballasts. However, the FL032/T8 fluorescent lamp requires higher voltage to discharge the lamp. The general starter with two-terminal is not suitable for the FL032/T8 slim-line type fluorescent for its higher discharge voltage. The suitable starter with three terminals have been studied for the FL032/T8 lamp in this paper. The developed starter have better characteristics in view points of the discharge voltage magnitude. We have proposed and designed the three terminals electronic starter. The proposed starter have been experimented and compaired with the other 2-terminal general starters. By the experimental results, we have concluded that the proposed starter is suitable to the FL032/T8 lamp.

• 한국산학기술학회논문지
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• 제11권1호
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• pp.113-118
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• 2010

압전 변압기와 CCFL, 형광등의 전기적 등가회로에 의한 PSPICE 모델을 제시하였고, 차세대 35W급 초절전형 삼파장 T5 형광램프용 고효율 형광등 안정기를 개발하였다. 이 안정기는 역률개선회로와 인버터에 압전 변압기를 채용하여 T5 형광램프의 점등실험을 하였으며, 압전 변압기의 효율적인 구동과 정확한 주파수 공급을 위하여 PLL방식을 사용하였다.

• 한국조명전기설비학회지:조명전기설비
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• 제13권2호
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• pp.149-149
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• 1999

This paper is to present a selected method of circuit parameters in the inverter part of the electronic dimming ballast for fluorescent lamps, that is adequate to use with the prevailing dimming controller IC. Through the experiment result using the prototype of the electronic dimming ballast produced by this method, its validity is verified from the electrical and light output characteristics on fluorescent lamps. Also, it is feasible to remote automatic and passive control fur dimming electronic ballast as using a microprocessor, and we easily recognize the lamp condition owing to make a program indicate abnormal behavior for fluorescent lamp at PC screen.

• 한국조명전기설비학회지:조명전기설비
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• 제10권5호
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• pp.52-56
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• 1996

형광 램프는 에너지 효율이 높아 상업용 조명설비에 많이 사용된다. 형광램프 시스템의 설계에서 안정기의 설계는 형광 램프의 특성을 고려하는 것이 매우 중요하다. 특히, 시동시 형광램프의 과도특성은 안정기 설계시 좀더 많은 설계사양들을 제공하게 된다. 이 논문에서는 시동시 과도특성에 근거한 형광램프의 동작모델을 동기화로 나타냈다. 이 모델은 제조사가 다른 형광 램프에도 폭 넓게 적용이 가능하다. 실험에 의해 얻어진 결과를 동기회로 모델에 의한 Pspice 시뮬레이션에 의해 나타난 결과와 비교 한 결과, 본 논문에서 제시한 모델이 실질적으로 효용성이 있음을 나타냈으며, 자기식 안정기 및 전기식안정기의 설계시 형광램프의 시동과도특성에 의한 안정기 조건 설계들을 더욱 명확하게 알아낼 수 있었다.

• 마이크로전자및패키징학회지
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• 제8권2호
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• pp.43-48
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• 2001

Economical consumption of energy, longer life of lamps, higher lighting comfort and new aesthetic of illumination is subject of numerous research and development works. The halogen lamps are an example of positive solution some of above mentioned problems. The electronic transformers are more frequent used for their supply. In comparison with conventional transformers they have less weight, less volume and 60% less power losses. Their advantages are particular visible, when the hybrid technique is applied. The paper presents the results of engineering research and development works carried out in Private Institute of Electronic Engineering, in R. & D. Center for Hybrid Microelectronics and Resistors and in Technical School of Communications in Krakow, in the field of the design and exploitation tests of hybrid converters 220V AC /12V DC (electronic transformers) and electronic ballasts destined for the supply of halogen lamps 20W to 150W and fluorescent lamps respectively. To perform the converters, thick film technology and surface mount technology were used. For the protection of converter electronic circuit the thick film temperature sensor and transistors were applied. Moreover the paper presents the base application circuits of elaborated converters, their technical parameters and exploitation results. The development perspectives of such domain of hybrid circuits are also discussed.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2001년도 Proceedings of 6th International Joint Symposium on Microeletronics and Packaging
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• pp.57-65
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• 2001

Economical consumption of energy, longer life of lamps, higher lighting comfort and new aesthetic of illumination is subject of numerous research and development works. The halogen lamps are an example of positive solution some of above mentioned problems. The electronic transformers are more frequent used for their supply. In comparison with conventional transformers they have less weight, less volume and 60% less power tosses. Their advantages are particular visible, when the hybrid technique is applied. The paper presents the results of engineering research and development works carried out ill Private Institute of Electronic Engineering, in R. & D. Center for Hybrid Microelectronics and Resistors and in Technical School of Communications in Krakow, in the field of the design and exploitation tests of hybrid converters 220V AC /12V DC (electronic transformers) and electronic ballasts destined for the supply of halogen lamps 20W to 150W and fluorescent lamps respectively. To perform the converters, thick film technology and surface mount technology were used. For the protection of converter electronic circuit the thick film temperature sensor and transistors were applied. Moreover the paper presents the base application circuits of elaborated converters, their technical parameters and exploitation results. The development perspectives of hybrid domain of hybrid circuits are also discussed.

• 원예과학기술지
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• 제35권1호
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• pp.21-29
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• 2017

This study was conducted to determine the effects of artificial lighting sources on vegetative growth of Phalaenopsis and Doritaenopsis (an intergeneric hybrid of Doritis and Phalaenopsis) orchids. One - month - old plants were cultivated under fluorescent lamps, cool - white light - emitting diodes (LEDs), or warm - white LEDs at 80 and $160{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. The blue (400 - 500 nm) : green (500 - 600 nm) : red (600 - 700 nm) : far - red (700 - 800 nm) ratios of the fluorescent lamps, cool-white LEDs, and warm-white LEDs were 1 : 1.3 : 0.8 : 0.1, 1 : 1.3 : 0.6 : 0.1, and 1 : 2.7 : 2.3 : 0.4, respectively. Each light treatment was maintained for 16 weeks in a closed plant-production system maintained at $28^{\circ}C$ with a 12 h photoperiod. The longest leaf span, as well as the leaf length and width of the uppermost mature leaf, were observed in plants treated with warm-white LEDs. Plants grown under fluorescent lamps had longer and wider leaves with a greater leaf span than plants grown under cool-white LEDs, while the maximum quantum efficiency of photosystem II was higher under cool-white LEDs. The vegetative responses affected by different lighting sources were similar at both 80 and $160{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. Leaf span and root biomass were increased by the higher light intensity in both cultivars, while the relative chlorophyll content was decreased. These results indicate that relatively high intensity light can promote vegetative growth of young Phalaenopsis plants, and that warm - white LEDs, which contain a high red-light ratio, are a better lighting source for the growth of these plants than the cool-white LEDs or fluorescent lamps. These results could therefore be useful in the selection of artificial lighting to maximize vegetative growth of Phalaenopsis plants in a closed plant - production system.