• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.2002-2006
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• 1997

A new PF correction topology, Improved Valley Fill (IVF) with Valley Boost Converter (VBC) used in the electronic ballast for fluorescent lamp is presented. The IVF can adjust the valley voltage higher than half the peak line voltage. Hence, there is no pulsating line current around the line voltage peak, PF and THD are significantly improved. The VBC is added to the IVF to achieve unity PF and to increase the valley voltage. The measured PF and THD for a prototype electronic ballast are 0.997 and 5%, respectively, and the lamp current CF is as low as 1.5

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 F
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• pp.2559-2561
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• 1999

The life of a fluorescent lamp is greatly affected by starting scenario and crest factor. This paper will propose a new crest factor control method in electronic ballast for fluorescent lamp using Pulse Frequency Modulation (PFM), which employs a passive Power Factor Correction (PFC) circuit in the input stage. The operation of parellel-loaded circuit, the switching frequency. and the characteristics of electronic ballast with the proposed PFM control scheme are described in detail, and its validity is verified by the simulation results.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.201-204
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• 2002

Electrodeless fluorescent lamps utilizing an inductively coupled plasma were found to have a long lifetime and high efficacy and now are used in some indoor and outdoor apllications. This paper gives a basic data of electrodeless fluorescent lamp 'Endura'(OSRAM SYLVANIA ICETRON/ENDURA 150W). The experimetal system consist of ENDURA 150W/840 Coolwhite lamp and ENDURA 150/200-240 S ballast.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.1100-1103
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• 1992

Two different resonance inverters used as fluorescent lamp ballast are based on the self oscillation at the series resonance of the circuit components. Each circuit is simulated on a computer in order to explain its function and the variation of the circuit variables for each of the circuit elements. Experimental results have bean carried out on the unsymmetrical scheme to indicate the voltage and current of the fluorescent lamp operation at the high frequency.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2003년도 학술대회논문집
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• pp.219-222
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• 2003

Electrodeless fluorescent lamps utilizing an inductively coupled plasma were found to have a long lifetime and high efficacy and now are used in some indoor and outdoor applications. This paper gives a basic data of electrodeless fluorescent lamp ‘QL’(Philips). The experimetal system consist of QL 85W/840 lamp and QL 85W S/03 ballast.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.228-232
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• 2002

In this paper, In order to solve the problem is proposed using a new type of electronic ballast that the traditional magnetic ballasts operated at 50-60Hz have been suffered from noticeable flicker, high loss, large crest factor and heavy weight which is composed of rectifier, active power corrector, series resonant half bridge inverter, micro-controller and piezoelectric transformer for driving for driving T5 fluorescent lamp were manufactured. The proposed electronic ballast operated at high frequency (about 75kHz) shows a input power factor of more than 0.995, total harmonic distortion of less than $12\%$ and lamp current crest factor of less than 1.5, respectively. Output power and efficiency showed 28w and $85\%$, respectively. Accordingly, it is considered that the ballast using piezoelectric transformer can replace the typical electronic ballast.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.19-21
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• 2002

Electroded lamps operated at a high enough frequency can usually be modeled for the purpose of ballast design, as a resistor. Electrodeless fluorescent lamps include other components such as the arc tube's inductance. But that's impedance is small and so will be neglected in this paper. So, electrodeless fluorescent lamps is modeled as a resistor. A SPICE compatible model was developed for an electrodeless fluorescent lamp(OSRAM SYLVANIA ICETRON/ENDURA 150W).

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.9-10
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• 2007

This paper presents that what's the right EOLL(End of Lamp Life) phenomenon on fluorescent lamp and how to detect it according to the lamp status. In normal end of life situation for fluorescent lamps is emitter depletion of the cathodes. So, in most cases, the discharge will extinguish and the lamp will not start. But if the ballast is capable of sustaining the discharge, a new condition arise. Especially, the T4 and T5 lamp which has a short distance from cathode to socket of lamp future must have the EOLL Protection function.

• 조명전기설비학회논문지
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• 제21권8호
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• pp.1-9
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• 2007

무전극 램프는 유도방전을 일으키기 위해 사용되는 자성체로 인하여 안정기 부하로서의 특징이 기존의 형광등 램프와는 다르게 인덕턴스 성분을 포함하게 된다. 따라서 상업적으로 많이 사용하는 자려식 방식의 안정기를 구현할 경우 발진 조건을 만족시켜야 하는 파라미터의 증가로 인하여 실제 설계 및 개발이 보다 복잡하게 된다. 본 논문에서는 엔두라 무전극 램프를 대상으로 모델을 이용한 분석과 모의실험으로 자려발진 조건을 찾아서 신속히 설계할 수 있는 실용적 시뮬레이션 기법에 대해서 연구하였으며, 실험을 통해서 연구된 방식의 타당성을 보였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.746-749
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• 2002

This paper presents a new control method for the high frequency electronic ballast which is operated with raw rectified dc link using diode bridge. For the commercial electronic ballast, proper ac input power factor and crest factor of the lamp current are required. The most ballast, therefore, has a active or passive power factor collection (PFC) circuit. With the proposed method, it can be achieved simultaneously that grater than 0.9 of input power factor and less than 1.85 of lamp current crest factor without any PFC circuit. In this paper, the proposed ballast control scheme and the experimental results for the application to the fluorescent lamp are described.