• Title/Summary/Keyword: Fluorescent Lamp

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Analysis on the Light Source Efficiency of CCFL and LED Monitors (CCFL 및 LED 모니터 광원 효율 분석)

  • Shin, Hee-Woo;Yoo, Jae-Soo
    • The Journal of the Korea Contents Association
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    • v.21 no.6
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    • pp.44-50
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    • 2021
  • In this paper, we analyze the efficiency of light sources of CCFL and LED monitors. Cold Cathode Fluorescent Lamp (CCFL), which is widely used as a light source for LCD display, supplies a high voltage of 1,200[V] or more when it is initially driven. In addition, a constant normal voltage of 400 ~ 800[V] after lighting, and 3 ~ 6[ mA] is needed for a power circuit that can stabilize the current. Applying a high voltage causes a lot of stress on the inverter and generates a lot of heat in the cold cathode lamp, causing significant damage to the BLU (Back Light Unit), resulting in a burning phenomenon, which causes the screen to output normal colors when outputting the screen. We can not see the yellow output and the screen darkened. Therefore, in order to prevent such a symptom in advance, efficiency can be increased by using a Light Emitting Diode (LED) as the light source of the LCD display instead of a cold cathode fluorescent lamp (CCFL). As a result, it is shown that the LED method outperforms the CCFL method.

Light Intensity and Spectral Characteristics of Fluorescent Lamps as Artificial Light Source for Close illumination in Transplant Production Factory (식물묘공장의 근접조명용 인공광원으로서 형광등의 광강도 및 분광 특성)

  • 김용현;이종호
    • Journal of Biosystems Engineering
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    • v.23 no.6
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    • pp.591-598
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    • 1998
  • Light intensity and spectral characteristics of different types of fluorescent lamps were tested to investigate their possibility as the artificial lighting sources for the close illumination applied in the transplant production factory. Photosynthetic photon flux densitiy(PPF), illuminance and irradiance for all lamps decreased logarithmically with an increase of the vertical distance from the lighting source. The fluorescent lamp specially designed plant growth (PG lamp) showed a maximum spectral irradiance at the wavelength of 660nm. However, it showed lower irradiance than that of a standard fluorescent lamp at the range of wavelength between 500 and 600nm. On the other hand, PG lamp showed higher PPF and lower illuminance than those of the standard fluorescent lamp. The maximum peak of spectral characteristics for both of the single and twin three-bind fluorescent lamps was shorn at the wavelength of 545m and the next peaks were shown at the wavelength of 610nm and 435nm, respectively. Since the red fluorescent lamp has a narrower peak at the wavelength of 660nm, it may be useful for the supplementary red lighting. For three of standard, single three-band and twin three-band fluorescent lamps, the values of conversion factor for converting illuminance to PPF fell within the narrow range from 76 to 791x/$\mu$molㆍm$^{-2}$ ㆍs$^{-l}$ . However, for PG lamp, it was 29.71x/$\mu$molㆍm$^{-2}$ ㆍs$^{-1}$. Also, the values of conversion factor for converting PPF to irradiance of fluorescent lamp used in this study ranged between 4.85 and 5.34$\mu$molㆍm$^{-2}$ ㆍs$^{-1}$/Wㆍm$^{-2}$ .

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Design and Fabrication of Scanning Backlight Unit using Flat Fluorescent Lamp (면광원을 사용한 Scanning Backlight Unit의 설계 및 제작)

  • Chae, Hyung-Jun;Jung, Yong-Min;Hwang, Sun-Nam;Hur, Jeong-Wook;Lee, Jun-Young;Lim, Sung-Kyoo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.5
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    • pp.376-382
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    • 2008
  • In this paper, scanning backlight unit which can reduce motion blur was designed and fabricated using flat fluorescent lamp. The FFL(flat fluorescent lamp) is in the limelight as a new illuminant of next generation BLU(backlight unit), because of simple assembly and reduction of driving components. In order to control lamp brightness, lamp on-time was controlled. In this experiment, it was confirmed that lamp brightness can be dimmed linealy and in a wide range.

Electron mobility calculations for fluorescent lamp positive column in AC period (형광램프 양광주 교류주기 내에서의 전자이동도 계산)

  • Chee, Chol-Kon;Yi, Chin-Woo
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.766-768
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    • 1988
  • Electron mobility which is a basic parameter to represent gas state, is calcurated using equation assumed Lorentz gas. This equation is applied to 30mm 20W fluorescent lamp. In order to obtain electric field strength of positive column, lamp and cathode fall voltage wave form is measuread using indirect voltage measuring methode. To obtain electron density, used the calculation of S.C Peek and D.E Spencer. The result which is applaied 38mm fluorescent lamp at 400mA, $20^{\circ}C$ is displayed.

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Optical E-H Transition Properties of Inductively Coupled Plasma with Ar Gas Pressure and RF Pourer (Ar 가스 압력과 RF 전력변화에 따른 유도결합형ㆍ플라즈마 E-H모드 변환의 광학적 특성)

  • 허인성;조주웅;이영환;김광수;최용성;박대희
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.1
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    • pp.20-23
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    • 2004
  • In this paper, the emission properties of electrodeless fluorescent lamp were discussed using the inductively coupled plasma. To transmit the electromagnetic energy into the chamber, a RF power of 13.56 [MHz] was applied to the antenna and considering the Ar gas pressure and the RF electric power change, the emission spectrum, Ar I line, luminance were investigated. At this time, the input parameter for ICP RF plasma, Ar gas pressure and RF power were applied in the range of 10∼60 [mTorr], 10∼300 [W], respectively. From emission intensity and lumnance intensity results, the mode transition from E-mode to H-mode was observed. This implies that this method can be used to find an optimal RF power for efficient light illumination in an electrodeless fluorescent lamp.

A Study on Drive System Characteristics of the Ballast for 35W(T5) Fluorescent Lamp using Piezoelectric Transformer (압전 변압기를 이용한 35W(T5)급 형광등 안정기 구동 시스템 특성에 관한 연구)

  • Hwang, L.H.;Jang, J.H.;Na, S.K.;Kim, Y.S.;Ahn, I.S.;Cho, M.T.;Song, H.B.
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1031-1033
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    • 2006
  • In this study, in order to solve these problems, a new type of electronic ballast, which is composed of rectifier, active power factor corrector, series resonant half bridge inverter and piezoelectric transformer, was proposed for driving T5 fluorescent lamp. Driving of piezoelectric transformer was carried out with input region for the ring electrode and output region for the dot electrode. A 35W (T5) fluorescent lamp was successfully driven by the fabricated ballast with piezoelectric transformer.

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A Study on the Application of LED Light Source in Subway Train (도시철도차량에 LED 광원의 적용에 관한 연구)

  • Choi, Sung-Kuk;Park, Dae-Won;Kil, Gyung-Suk;Park, Hee-Chul;Jo, Eun-Je
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.2050-2055
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    • 2009
  • This paper describes the proceeding experimental results to replace the 32 [W] fluorescent lamp installed in subway train to a LED module. We fabricated 25 [W] LED modules to meet the illuminance 300 [lx] specified in the standard for subway train. After the installation of LED modules, comparative analysis with conventional fluorescent lamps was carried out. From the experimental results, illuminances on the height of 0.85 [m] and 1 [m] above floor were 323 [lx] and 360 [lx], respectively. These illuminances satisfied the requirement 300 [lx]. By the application of 25 [W] LED module as a light source in subway train, energy saving about 22 [%] compared with 32 [W] fluorescent is acquired. Also, low cost of maintenance is expected due to 8 times longer lifetime 50,000 hours of LED than that 6,000 hours of fluorescent lamp.

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Electron Mobility Calculations for the Positive Column of a Fluorescent Lamp (형광램프 양광주 내의 전자이동도 계산)

  • 지철근;장우진;이진우
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.2 no.2
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    • pp.55-58
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    • 1988
  • Electron mobility which is a basic parameter to represent gas state, is calculated for 38mm 20W fluorescent lamp. 2 Electron Group Model is u&ed for electron distribution function. To prove this result electron mobility in 38mm 20W fluorescent lamp is measured at various wall temperatures. In order to obtain electric field strength of positive column, the sum of anode and cathode fall voltages assumed to be 15(VJ) and dual slit is used to measure positive column length. The measured and calculated result is potted under $10-80^{\circ}C$ wall temperature.

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Abnormal Discharge Characteristics of Fluorescent Lamp

  • Lee, Chang-Ho;Kang, Jae-Kyung;Jang, Eun-Seok;Kim, Jae-Bum;Park, Joon-Ha;Shin, Jong-Keun;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1425-1427
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    • 2009
  • In this paper, we investigated influence of gas pressure and gas mixing ratio on the abnormal discharge characteristics of fluorescent lamp. Abnormal discharge characteristics have been examined by changing inner gas pressure and mixing ratio. As the inner gas pressure and mixing ratio increase, the occurrence of abnormal discharge was delayed. It was found out that the occurrence of abnormal discharge is sufficiently delayed at the optimized inner gas pressure and mixing ratio.

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Analysis of Optical and Electromagnetic Distribution of Ring-shaped Electrodeless Fluorescent Lamps (환형 무전극 램프의 광학적, 전자계적 해석)

  • 조주웅;최용성;김용갑;박대희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.4
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    • pp.460-464
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    • 2004
  • 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. 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 and is intended as a high efficacy 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 D simulation software operated at 250KHz and some specific conditions. Photometric characteristic of the ring-shaped electrodeless fluorescent lamp were investigated using LS-100 lightmeter and TA-0510 thermometer respectively.