• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.174-177
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• 2005

Offline switching power supplies have high voltage and high current switching waveforms that generate Electromagnetic Interference(EMI) in the form of both conducted and radiated emissions. Consequently, all off-line power supplies must be designed to attenuate or suppress EMI emissions below commonly acceptable limits. Electrodeless fluorescent lamp's ballasts have AC/DC flyback converter, so we must control the EMI emissions.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.69-72
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• 2004

In this paper, we measured the electrical and optical characteristics of an electrodeless fluorescent lamp system as product of the inside and outside of the country and compared the measured data. Output current wave of domestic 150 W is unstable than it's of Endura 150 W. But the former of spend time after discharging and output current value is small than the latter. And optical characteristics(brightness, flux, color rendering index, efficiency) value of the former is a little small than the latter. In conclusion, if we improve a little more quality then we must secure the superiority in competition.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.21-24
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• 2004

In this paper, we measured the optical characteristics of the electrodeless fluorescent lamp system as product of the inside and outside of the country and compared the measured data. Power consumption wave of domestic 150 W is unstable than it's of Endura 150 W. Optical characteristics(luminance, luminous flux, color rendering index, efficiency, CIE chromaticity coordinate) value of the former is a little small than the latter. In conclusion, if we improve a little more quality then we must secure the superiority in competition.

• Proceedings of the KIEE Conference
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• 2003.10a
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• pp.53-56
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• 2003

Photometric analysis is essential process to make design for 300W Electrodeless flood lighting fixture. But lighting source's unusual shape makes it difficult to fix in and so we supposed two kinds of installation method to solve this matter. One is to place lamp base down and second is to put lamp base side like normal HID lamps. In result, former photometric analysis came to reach a target for similar asymmetric photometric data meanwhile we can not escape work to design complicated reflector. Second analysis reached conclusion that it is more simplified reflector than former. On its lighting fixture's design, the former reflector is new and attractive breaking fixed idea but the latter is only staying in the range of existing HID lighting design.

• Proceedings of the KIEE Conference
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• 2003.10a
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• pp.68-71
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• 2003

In this paper, We have investigated the luminous flux, luminous efficacy, spectral energy distribution, colour rendering index, correlated colour temperature of electrodeless QL lamp system as a center method of measurement and side method of measurement. A result of measurement is that center method of measurement and side method of measurement is almost similar. Therefore, Sample that didn't measured because of big size and heavy weight can be measured by center method of measurement.

• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.166-168
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• 2007

A dimmable ballast system for the electrodeless fluorescent lamp is proposed. The proposed scheme is composed of the electronic ballast and the wireless communication part. They both are realized with one EPLD (Erasable Programmable Logic Device). The dimming levels of each lamps can be controlled by a management system through wireless communication technology. 10 ballasts are used for the group lighting system and the experiment results show the system works well.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.902-905
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• 2004

Characteristics of electrodelss lamp as a load of the ballast is different compared to normal fluorescent lamp because the lamp includes the magnetics for inductive discharging process. So somewhat different modeling is necessary to make a proper power match between the lamp and ballast. Modeling of an electrodeless lamps, Endura of Osram, is presented in this paper. Simulation with a result of experiment is given for a verification of proposed model.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.53 no.3
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• pp.133-136
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• 2004

Low-Pressure inductively coupled RF discharge sources have important industrial applications mainly because they can provide a high-density electrodeless plasma source with low ion energy and low power loss. In an inductive discharge, the RF power is coupled to the plasma by an electromagnetic interaction with the current flowing in a coil. In this paper, the experiments have been focussed on the electric characteristic and carried out using a single Langmuir probe. The internal electric characteristics of inductively coupled Ar RF discharge at 13.56(MHz) have been measured over a wide range of power at gas pressure ranging from 1∼70(mTorr).

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.52 no.11
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• pp.508-511
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• 2003

In this paper, electrical characteristics of inductively coupled plasma in an electrodeless fluorescent lamp were investigated using a Langmuir probe with a variation of argon gas pressure. The RF output was applied in the range of 5 ∼ 50 (W) at 13.56 (MHz). The internal plasma voltage of the chamber and the probe current were measured while varying the supply voltage to the Langmuir probe in the range of -100 (V) ∼+100 (V). When the pressure of argon gas was increased, electric current was decreased. There was a significant electric current increase from l0W to 30 〔W〕. Also, when the RF power was increased, electron density was increase. This implies that this method can be used to find an optimal RF rower for efficient light illumination in an electrodeless fluorescent lamp.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.5
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• pp.816-820
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• 2008

The RF inductive discharge of inductively couples plasma (ICP) continues to attract growing attention as an effective plasma source in many industrial applications, the best known of which are plasma processing and lighting technology. Although most practical ICPs operate at 13.56 [MHz] and 2.65 [MHz], the trend to reduce the operating frequency is clearly recognizable from recent ICP developments. In an electrodeless fluorescent lamp, the use of a lower operating frequency simplifies and reduces cost of RF matching systems and RF generators and can eliminate capacitive coupling between the inductor coil and plasma, which could be a strong factor in wall erosion and plasma contamination. In this study, We discussed simulation and experimental results when changing ferrite position in antenna.