• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.12
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• pp.214-220
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• 2010

This paper presents the results of a study on an electrodeless high intensity discharge (HID) lamp system that is powered by circularly polarized microwaves (CPMs). The technique to generate CPMs enables an electrodeless high intensity discharge lamp to be turned on without the retation of the bulb but conventional electrodeless high intensity discharge lamps use rotating bulbs in order to prevent a puncture in a hot spots that are formed by the linearly polarized microwaves in the circular cavity. The technique to generate CPMs is described and the salient features of the lamp characteristics are presented.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.6
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• pp.628-634
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• 2004

The soft switching is applied to the multi-level inverter to enhance the characteristics of HID(High Intensity Discharge) Ballast in headlight of vehicle. The electrical properties are investigated. The available modeling of the ballast in steady-state is calculated using mathematical method and the result is used in analyzing the power characteristics and design of the system. Finally the designed system md modeling is confirmed by the experiment.

• Proceedings of the KIEE Conference
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• 2002.04a
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• pp.123-125
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• 2002

To simulate the characteristics of an High-Intensity Discharge Lamp, this paper uses PSpice circuit model which have been developed from modification of the classical Cassie and Mayr equations. The model is for an High-Intensity Discharge Lamp and compatible to adopt high-frequency electric ballast. This model is correspond to some conditions between the simulated and experimental results.

• Journal of Mechanical Science and Technology
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• v.16 no.11
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• pp.1404-1411
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• 2002

A newly developed high intensity discharge (HID) automotive headlamp results in a high luminous gradient at the cutoff line, and proves the superior concept in safer and more com-fortable nighttime driving. This new headlamp technology Provides drivers expanded night vision by a significantly improved light pattern. However, the HID headlamp may dazzle other traffics during traversing a rough road or encountering an unexpected bump. To resolve this problem, an automatic headlamp leveling device is necessary. A preview control is presented for the design of the leveling system. The proposed control algorithm is capable of attenuating a dynamic glare which is one of the major detractors to a driving in dark roads. Computer simulations using ADAMS are carried out to confirm the effectiveness on the control system.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.22 no.8
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• pp.45-51
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• 2008

HID(High Intensity Discharge) search lamp for shipment requires a high open circuit and output current compare than vehicle. This paper presents a soft-start open circuit voltage and constant current sequence control method for 2.5[kW] HID search lamp. The proposed method controls the opal circuit voltage and discharge current of HID lamp according to ignition signal with a simple 8-bit micro-processor and PWM device. For the stable control of lamp, micro-processor checks the output voltage and current. And the checked signals are compared with ignition signal and changes the control mode for stable operation. An ignition signal and micro-processor change the control mode from open circuit voltage contort to constant current control. The proposed control scheme is verified from experimental tests of 2.5[kW] HID search lamp for shipment.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.674-678
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• 2005

HID 램프란 High Intensity Discharge Lamps의 약어로서 고압방전램프라 하고, 대규모 공간의 조명이 필요한 공공시설, 산업시설, 상업시설 이외에 스포츠 시설 등 폭넓은 용도에 대응하고 있다. HID 램프는 부성저항 특성으로 인하여 직접 전원에 접속하기 때문에 램프 전류가 흐르게 되면 급격히 전류가 증가하여 전류의 흐름이 매우 불안하게 된다. 따라서 이것을 안정시키기 위하여 전원과 램프사이에 전류 제한장치인 안정기(Ballast)로 램프 전류를 적절하게 제어할 필요가 있다. 본 고에서는 HID 램프에 관한 열화요인과 이에 대한 수명의 관계를 중심으로 논한다.

• The Magazine for Energy Service Companies
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• s.1
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• pp.50-55
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• 1999

• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.595-598
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• 1999

A new of the automotive High Intensity Discharge(HID) lamp ballast systems is proposed. Proposed scheme is consisted of the high frequency DC-DC converter and low frequency DC-AC inverter as same as conventional HID ballast system. But this system separates ignition voltage from dc link voltage, which results to used the lower voltage rating power devices for HID lamp ballast system compared with conventional system. As a result, proposed system has a lower cost and higher efficiency.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.669-673
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• 2005

HID 램프란 High Intensity Discharge Lamps의 약어로서 고압 방전램프라 하고, 대규모 공간의 조명이 필요한 공공시설, 산업시설, 상업시설 이외에 스포츠 시설 등 폭넓은 용도에 대응하고 있다. HID 램프는 부성저항 특성으로 인하여 직접 전원에 접속하기 때문에 램프 전류가 흐르게 되면 급격히 전류가 증가하여 전류의 흐름이 매우 불안하게 된다. 따라서 이것을 안정시키기 위하여 전원과 램프사이에 전류 제한장치인 안정기(Ballast)로 램프전류를 적절하게 제어할 필요가 있다. 본 고에서는 안정기를 구성하는 구성 재료와 부품이 사용 중에 주로 영향을 받는 것으로 생각되는 열화요인과 이에 대한 수명의 관계를 중심으로 안정기의 수명에 대해서 논하고자 한다.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.4
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• pp.231-237
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• 2006

This paper proposes an effective drive of high intensity discharge (HID) lamp ballast for cars. All control functions of the proposed ballast are implemented using a low-cost single chip microcontroller, PIC16C73 to optimize the total system size and to minimize cost through minimization of total component number. The proposed ballast generates high open-circuit voltage to ignite the lamp and is controlled to supply effectively the power required to shorten warm-up period after the breakdown. The DC-DC converter of the DC-AC converter part of the ballast utilizes the flyback converter topology that can minimize component number. Also, because to more minimize the ballast size, the transformer size must be minimized, for this, PWM (Pulse Width Modulation) pulses are generated with high frequency using the PWM module of the microcontroller. An analysis for this is explained, briefly. As if the operation of the lamp and ballast arrives at steady-state, then the ballast must AC-control the lamp, for this, the microcontroller utilizes the other PWM module. And the part related to the igniter is explained, briefly. It is shown through experimental results that the controller of the proposed ballast has good performance for the HID lamp for cars.