• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.413-415
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• 1995

This paper presents a new approach in the design of multiple power output electronic ballasts for compact fluorescent lamps which power output range of 11W, 15W, 20W by using equivalent resistance and RLC equivalent circuit concept and frequency control. A multiple power output electronic ballast which adopts half-bridge inverter topology is set up to compare the results of PSpice simulation with experimental ones. Starting characteristics of lamp voltage, lamp current and light output are better than the existing electronic ballasts, and therefore is verified the validity of the proposed method.

• 한국진공학회지
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• 제12권1호
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• pp.46-50
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• 2003

외부전극 형광램프 12개를 평면에 배치하여 제작한 대각길이 17인치 직하형 백라이트의 구형파 구동에 의한 휘도와 효율 특성을 조사하였다. 구동 전압 1-2 kV와 주파수 40-80 kHz에 대하여 백라이트 패널의 휘도가 5,000-10,000 cd/$\textrm m^2$ 일 때 효율 65-70 1m/W를 얻었다. 구동 주파수가 클수록, 고휘도를 얻고 구동 전압이 낮아진다. 구동 주파수가 80 kHz 이상의 주파수에서는 백라이트의 휘도가 불안정하고, 면전체 휘도의 균일성을 얻지 못한다.

• 조명전기설비학회논문지
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• 제28권3호
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• pp.91-96
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• 2014

Modern electronic circuits are becoming more vulnerable to damage by surges, and it is required to improve the impulse withstand voltage performance of electrical and electronic equipment. This paper presents the impulse withstand voltage performance of lighting equipment connected to power lines, and the impulse withstand voltage tests for fluorescent lamp, LED lamp and halogen lamp were carried out according to the reference standards under normal service conditions. To conduct performance tests against lightning surge, a combination wave ($1.2/50{\mu}s$ voltage - $8/20{\mu}s$ current) was employed. The test surge was applied between lines or between line and ground of the specimen to be measured. The test surge was applied synchronized at the peak value of the positive and negative AC voltage waves. As a consequence, some specimens satisfied the impulse withstand voltage test criteria, but lighting equipment such as 36W fluorescent lamps, 5W and 5.5W LED lamps and 50W halogen lamp were damaged at the test voltage levels between power lines. It is needed to improve the qualities of lighting equipment to satisfy EMC immunity requirements of equipment for general lighting purposes.

• 한국화재조사학회논문지
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• 제11권1호
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• pp.41-58
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• 2008

등불의 발견은 인간 생활에 커다란 변화를 가져 왔으며, 그 역사는 매우 오래되었다. 그러나 비약적으로 발전한 것은 1879년 에디슨이 탄소 필라멘트 진공 전구를 발명하여 조명에 사용하면서 시작되었다고 할 수 있다. 조명은 피로를 덜어주고 안전도를 높이며 사람의 활동 능률을 올리고 즐거운 분위기를 만들어 준다. 그러나 부주의나 관리소홀로 인해 소중한 재산과 인명을 앗아가는 화재의 원인이 되기도 한다. 본 연구에서는 조명등의 구조와 원리를 이해하고 일반가정에서 가장 많이 사용되고 있는 백열전구과 형광등을 중심으로 출화가능성과 조사확인사항에 대하여 발화사례를 중심으로 하여 배선과 가연물 접촉에 의한 사례 및 재현실험을 통하여 논문의 신뢰성을 확보하고자 하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 영호남 합동 학술대회 및 춘계학술대회 논문집 센서 박막 기술교육
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• pp.74-76
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• 2006

An external electrode fluorescent lamp (EEFL) has an advantage of a long lifetime in the ear1y stages of the study on plasma discharge, interest in the lamp continues. Researches on the operation of external electrode fluorescent lamps have focused mainly on its use of a type of high frequency (MHz). By performing high brightness using a square wave operation method with the low frequency below 100kHz, which is applied to a narrowed tube type lamp that has several mm of lamp diameter, EEFL presented the possibility of using it as a light source for back-lights. However, because EEFL generates plasma using wall charges, which considers the impedance characteristics of glass based on the structural principle in discharge, it can be significant1y affected by frequency. Thus, this study verified the change in the characteristics of electromagnetic fields according to the change in frequency through a Maxwell's electromagnetic field simulation and examined the relationship between the change in the EEFL frequency and brightness by measuring the optical characteristics. In addition, the characteristics of the transformation of energy orbits were verified by investigating the characteristics of the wavelength according to the change in frequency through the OES.

• 조명전기설비학회논문지
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• 제17권1호
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• pp.1-9
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• 2003

본 논문에서는 고역률의 단일전력단을 갖는 형광등용 전자식 안정기를 제안하고 설계ㆍ제작하였다. 저가의 새로운 형태를 갖는 고역률 단일전력단 형광등용 전자식 안정기는 부스터 컨버터와U형 고주파 공진 인버터로 구성되어진다. 그러나, 기존의 안정기와는 달리 제안된 안정기는 브리지 다이오드를 제거하고 간단한 제어회로로 구성함으로 간단한 구조를 갖는다. 부스터 컨버터는 상용전원의 정(＋), 부(－)전압에서 각각 동작하고 불연속 모드에서 동작함으로 높은 역률을 얻을 수 있다. 63.5〔W〕의 출력을 갖는 안정기를 제작하여 실험한 결과, PF 0.99, THD 15.4%, CF 1.55의 우수한 결과를 얻을 수 있었다.

• ALGAE
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• 제24권2호
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• pp.121-127
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• 2009

The unicellular green alga, Haematococcus pluvialis, accumulates the highest level of astaxanthin among knownastaxanthi.n-producing organisms. Light is the most important factor to induce astaxanthin by H. pluvialis. BIue andred LEDs, whose ${\lambda}_{max}$'s are 470 and 665 nm, respectively, were used for internally illuminated light sources.Fluorescent lamps were also used for both internal and external illumination sources. The astaxanthin levels in thesevarious lighting systems were analyzed and compared each other. The cultures under internally illuminated LEDsaccumulaled 20% more astaxanthin than those under fluorescent lamp. Furthermore, LEDs generated much lessheat than the fluorescent lamps, which gives one more reason for the LEDs being a suitable internal Light source forastaxanthin induction. The results reported here would lead novel designs of photobioreactors with improvementsof illumination methods for high level of astaxanthm production. The maximum astaxanthin concentrations as wellas the astaxanthin yield per supplied photon were increased by at least 20% when blue or red LEDs were supplied.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1998년도 하계 학술대회 논문집
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• pp.122-128
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• 1998

• 한국광학회:학술대회논문집
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• 한국광학회 2007년도 하계학술발표회 논문집
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• pp.321-322
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• 2007

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1997년도 추계학술발표회논문집
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• pp.18-20
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• 1997