• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.163-165
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• 2004

A low-cost electronic ballast using a conventional HID controller IC is proposed. The proposed ballast consists of high frequency DC-DC converter, low frequency DC-AC inverter, and igniter circuit. This ballast shows hot-restrike, suitable operation at each stage of various lamp state and stable operation in steady-state.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.4
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• pp.166-171
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• 2008

This paper presents high efficiency control system of automotive 35W electronic ballast for high intensity discharge(HID) lamp using switching flyback converter with variable frequency. Considering performance, size and efficiency of ballast, the flyback converter is designed with planar transformer in converter stage. HID lamp demands a highly efficient ballast and very complex control circuitry that can control complex transient state for applying to automotive. The proposed electronic ballast system is composed of a flyback converter using planar transformer, a full bridge inverter, and a step up igniter. In this system, switching frequency of flyback converter is controlled by varying input voltage of HID ballast and the price and the size of HID ballast using planar transformer can be reduced. The performance and efficiency of the posed system are verified through various the experiment results.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.517-518
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• 2008

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1255-1255
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• 2015

HID 조명램프에 의해 방사되는 전자파를 1GHz에서 2.5GHz 대역에서 측정하였다. 이 대역의 전자파적합성 규격은 정해져 있지 않으나, 각종 전파기기의 장해요인으로 대두될 수있다. 본 측정 결과는 방전등의 특성으로 인해 시간별로 차이가 매우 크게 발생됨을 확인할 수 있었다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2006.05a
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• pp.99-102
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• 2006

We developed the electronic ballast for the street HID lames with the leakage current detection and circuit breaker function. By detecting the leakage current and breaking the system we are protected from the electric shock and the ballast is safe from the electric damage at the time of the continuous reignition state.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.5
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• pp.449-454
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• 1999

A new scheme of the automotive High Intensity Discharge (HlD) lamp ballast systems is proposed. The p proposed scheme consists of the high frequency IX DC converter and the low frequency DC-AC inverter, like t that the conventional HID ballast system. However, this system separates the input voltage of the ignitor from t the dc link voltage, which results in the use of lower voltage rating power devices for the HID lamp ballast s system, comparlu with convention띠 system. As a result, proposed system has a lower cost and higher e efficiency. This paper presents th$\varepsilon$ design and anlaysis of the propoSlU ballast and some 앉아、nmental results.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.3
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• pp.7-14
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• 2004

The metal halide lamps are now widely used in the application and commercial lighting due to their attracting properties such as good color rendering and high efficiency. But, they have a serious problem of acoustic resonance using high frequency operation and they need a high voltage to ignite. So, they have not been applied to indoors. Over the past few years, a considerable number of studies have been conducted on the electronic ballast with hot restarting and resonance phenomenon. But, Very few attempts have been made at adaptive ignition method according to lamp state. In this paper is proposed electronicballast for metal halide lamps with an igniter for adaptive ignition. The proposed electronic bllast can generate a different ignition voltage according to the arc tube state.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.130-132
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• 2008

In the gas discharge lamp, starting procedure is composed of several physical discharge phases. The detailed phenomena are different according to lamp characteristics and ballasting method. This paper reviews starting methods in fluorescent lamp, and the starting procedure of HID lamp are investigated based on reviewed various waveforms.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.1
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• pp.94-102
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• 2015

The electronic ballast for HID lamps needs to ignite lamps even though the length from the ballast to lamp is far away. Therefore, it needs to do the research on a resonant ignition to turn on the HID lamps because the reduction of ignition voltage is not much depending on the distance. However, the parasitic capacitance is increased depending the length of the cable, and it affects the resonant frequency. The ignitor voltage can be increased drastically under the resonant ignition through frequency sweep, and it is the main reason of blowing up. Therefore, the clamping diode is proposed to suppress the voltage of the primary winding during resonant ignition.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.2
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• pp.1-8
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• 2002

The electronic ballast have much more shaking of arc than magnetic ballast because of acoustic resonance phenomenon. but it has used mare than before. In this paper, we made metal halide lamp modeling by modifying modeling of mercury lamp. To avoid acoustic resonance phenomenon, We calculated acoustic resonance frequency band. We proposed design of LCC circuit. Also, electronic ballast simulator for metal halide lamp was developed by simulink LCC parameters of inverter was decided on the basis of simulation results. After development of prototype ballast, it was verified the characteristics of simulator.