• 한국전산유체공학회지
• /
• 제17권3호
• /
• pp.45-52
• /
• 2012

This paper is a study on the design of the solar lamp bank which is a very important part of the solar simulator with the commercial metal halide lamps and infrared lamps. Lamp Bank is designed by the lamp bank design program based on point light source theory. The reliability of the program for lamp bank design is verified through irradiance variation experiments of a kind of lamp according to horizontal distance. Solar lamp bank facilitates heat distribution and satisfies the irradiance in the three wave length which test guidelines require. The shape of the ceiling board next to the lamp bank to promote the lamp cooling efficiency and to reduce temperature deviation and air velocity deviation in the chamber is so creative. The ceiling board of partial closed type is the best among several types.

• 전기학회논문지
• /
• 제57권10호
• /
• pp.1782-1789
• /
• 2008

This paper presents the design of acoustic resonance(AR) free and dimmable electronic ballast for 1kW Metal-Halide Lamp(MHL). The proposed Ballast consists of a Full-Bridge(FB) rectifier, a passive power factor correction(PFC) circuit, a full-bridge inverter, an ignitor using LC resonance and a control circuit for frequency modulation and dimming control. Whereas a passive PFC provides advantages in terms of high reliability and low cost for constructing the circuit, it is difficult to supply a stable voltage because of the output voltage ripple that occurs with a period of 120Hz. Although the ballast can be designed with a small size and a light weight if it is driven at a switching frequency between 1 and 100 kHz, AR will occur if the eigenvalue frequency of the lamp coincides with the inverter's operation frequency. The operation frequency was modulated in real time according to the output voltage ripple to compensate for the variation in power supplied to the lamp and eliminate AR. For dimming, the method, which modulated drive frequency of FB inverter using the control of DC level by microprocessor, was used. The Dimming ranged at least from 600W to 1kw as rated power of the lamp with 4 stages. Performance of the proposed technique was validated through numerical analysis, computer simulation using Pspice and by applying it to an electronic ballast for a prototype 1kW MHL.

• 한국방사성폐기물학회:학술대회논문집
• /
• 한국방사성폐기물학회 2017년도 춘계학술논문요약집
• /
• pp.88-89
• /
• 2017

• Journal of Electrical Engineering and Technology
• /
• 제1권3호
• /
• pp.332-337
• /
• 2006

In this paper, an electronic ballast was developed to control a 250W metal halide lamp. To avoid acoustic resonance phenomenon, we calculated the acoustic resonance band and determined the driving frequency from 70kHz to 100kHz. Due to the switching loss of MOSFET, many problems are caused in the inverter circuit during lamp lighting, so we reduced the loss by connecting the capacitor that minimizes the magnitude of the impulsive voltage. In this paper, the main point of research is to find the methods to operate the lamp on the rated output power. After detecting the current and the voltage of the lamp, we changed the driving frequency by adjusting the DC voltage level of the VCO input.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제54권1호
• /
• pp.47-52
• /
• 2005

This paper presents dimming control system for automotive 35W metal halide discharge(MHD) lamp electronic ballast. HID lamp demands a highly efficient ballast and very complex control circuitry that can control complex transient state in applying to automotive. Therefore, in this paper, a microcontroller-based digital control method for the HID lamp ballast is presented for optimal control that can adapt complex transient state, steady state and various environments. In developed dimming system, the system is designed to control the lamp output voltage step by step(continuous) using microcontroller according to CdS sensor. Therefore the designed dimming control system give good driving condition to diver and realize the power control effectively. The results of the proposed system is verified through various experiment results.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제49권8호
• /
• pp.545-550
• /
• 2000

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
• /
• 대한전기학회 2001년도 하계학술대회 논문집 D
• /
• pp.2534-2536
• /
• 2001

The most of metalhalide lamp is what the momentary restarting cannot be realized when the arc tube is in the hot condition. But if the lamp is restarted in the hot conditidn, we must supply the high voltage pulse with 15kv between the both electrodes of lamp. The proposed ignitor has two ignitors. If we connect each ignitor at the both sides, the high voltages of two different frequencies are generated. if so, when the one of the ignitor generates the highest voltage and the other applied generates the lowest voltage. At this time, the widest difference of voltage is applied to electrodes of the lamp. In this way, we can restart the lamp with the voltage 15kv, even if the lamp is in the hot condition.

• 한국정보통신학회논문지
• /
• 제6권7호
• /
• pp.1055-1061
• /
• 2002

본 논문은 70[w]급 세라믹 방전관 메탈할라이드 램프용 전자식 안정기의 설계 덴 제작에 대하여 기술하였다. 개발한 안정기는 정류회로, 능동성 역률개선회로, 하프브리지 인버터, LC 공진회로 및 제어회로로 구성되며, 램프의 재점등에 필요한 타이머 기능을 부가하였다. 점등시 램프에는 음향공명현상 과 플리커 현상 을 피하기 위하여 40[kHz]의 고주파 전압이 인가되도록 하였다. 실험결과로부터 역률과 효율은 각각 99.8[%] ,93.1[%]로 평가되었다.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2002년도 춘계종합학술대회
• /
• pp.301-304
• /
• 2002

본 논문은 70［W］급 세라믹 방전관 메탈할라이드 램프용 전자식 안정기의 설계와 제자에 대하여 기술하였다. 제안한 안정기는 정류기, 능동성 역률개선회로, 하프브리지 인버터, LC 공진회로 및 제어회로로 구성되며, 램프의 재점등에 필요한 타이머 기능을 추가하였다. 점등시 램프에는 음향공명현상과 플리커 현상을 피하기 위하여 45［KHz］의 고주파 전압이 인가되도록 설계하였다. 실험결과로부터 역률과 효율은 각각 91［%], 97.7［%］로 평가되었다.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2002년도 추계종합학술대회
• /
• pp.435-439
• /
• 2002

본 논문은 70[W]급 세라믹 방전관 메탈할라이드 램프용 전자식 안정기의 설계 및 제작에 대하여 기술하였다. 개발한 안정기는 정류회로, 능동성 역률개선회로, 하프브리지 인버터, LC 공진회로 및 제어회로로 구성되며, 램프의 재점등에 필요한 타이머 기능을 부가하였다. 점등시 램프에는 음향공명현상과 플리커 현상을 피하기 위하여 40[kHz]의 고주파 전압이 인가되도록 하였다. 실험결과로부터 역률과 효율은 각각 99.8[%], 93.1[%]로 평가되었다.