• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(5)
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• pp.319-322
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• 2002

In this Paper, we suggested the Half-Bridge inverter for the automotive HID electronic ballast. electronic ballast for automotive HID lamp should be supplied by low-frequency square wave avoiding the acoustic resonance(11kHz ∼ 825kHz). When the HID lamp is hot state, the electronic ballast should supply the sufficient current for a few milli-second to the lamp at the re-strike ignition state. that is called take-over current. We have introduced the new take-over current control method that could have reduced the peak current and supplied the sufficient take-over current.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권3호
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• pp.140-146
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• 2003

In this paper, we suggested electronic ballast with the half bridge inverter for the automotive HID lamp. The electronic ballast for the automotive HID lamp should be supplied by the low-frequency square wave avoiding the acoustic resonance. When the HID lamp is hot state, the electronic ballast should supply the sufficient current to the take over to the lamp at the re-strike ignition state for a few milli-second. We have introduced the new take-over current control method that could have control operating frequency and minimize circuits to the take over current circuits.

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

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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• pp.1023-1026
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• 2003

An electronic ballast for driving automotive HID lamps is presented. The circuit topology is composed of a fly back converter, a Ful bridge inverter, and an igniter. A prototype was developed and tested on a 35W lamp with a 12V input voltage. To avoiding the acoustic resonance, the full bridge inverter is operated at 250Hz and provided a squared-wave voltage source to the lamp. The transient and steady state characteristics of the tested HID lamps are measured and analyzed.

• 조명전기설비학회논문지
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• 제17권2호
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• pp.10-16
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• 2003

최근 고급차의 헤드라이트용 램프로 메탈핼라이드 램프가 사용되어지면서 자동차의 고급스런 분위기와 많은 광량으로 인하여 사물의 판독이 용이하여 특히 야간 운전시 많은 사람의 안전에 기여하고 있다[1][2][3]. 그러나 현재까지 국내에게 개발된 안정기는 신뢰도 및 안정성이 낮기 때문에 고가에 수입하여 일부 차에만 적용되고 있는 상태이다[4]. 본 논문은 자동차 헤드라이트용 전자식 안정기에 관한 내용을 다루었다. 전자식 안정기의 구성은 플라이백 컨버터, 하프브리지 인버터, 램프 이그니션을 위한 이그나이터 부분으로 이루어졌다. HID 램프가 가지는 음향공명 현상을 피하기 위해서 400(Hz)의 구형파로 램프를 동작 시켰으며, 램프 점등 초기에 더 많은 에너지를 램프에 공급하는 방법으로 램프 동작 주파수를 가변시키는 방법과 동시에 램프 점등 상태를 안정화를 위한 상태 천이 전류 공급 회로를 사용하였다. 본 논문의 확인 및 평가는 12[V] 축전지와 35[W] HID 램프를 사용해서 확인하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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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.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권4호
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• pp.238-243
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• 2006

This paper presents novel ignition method for automotive 35W metal halide discharge lamp electronic ballast. At this study, the novel method of ignition is developed to reduce costs and size of the ballast. By use of the novel method, the voltage needed in ignition is decreased, which result in use of the lower voltage rating power devices compared with conventional method and product compactness was achieved by deleting a circuit generating negative voltage needed in ignition at an conventional circuit. In terms of luminosity, color rendering, light efficiency(lm/W) and lifespan, the metal halide lamp is superior to, but unlike halogen lamp, it have more complicated transient characteristics to reach its steady state than the conventional halogen lamp. Therefore, in this paper, the electronic ballast was designed such that the metal halide lamp could be optimized for the automotive, by applying a method of microcontroller-based digital control. The results of the proposed system is verified through various experiment results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 추계학술대회 논문집
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• pp.111-115
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• 2004

In this paper, the requirements for the HID lamp igniter transformer capable of hot strike are described. A small size high voltage (HV) transformer composed of a Rod type ferrite core and aluminum foil is designed. The Electro Magnetic characteristics are simulated with Finite Element Methodology (FEM). The design guideline of the HV transformer that produces an output voltage with a peak value of 25kV and a pulse width of larger than loons for a 35W automotive HID ballast prototype is discussed as an illustrative example.

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

• 조명전기설비학회논문지
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• 제19권1호
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• pp.24-33
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• 2005

본 논문은 디지털제어방식을 이용한 자동차용 35[W]급 메탈핼라이드 램프용 전자식 안정기의 고효율 조광제어 시스템을 구현하였다. 본 논문에서는 밝기, 연색성, 광효율, 수명 등에서 기존의 할로겐 램프에 비해 우수한 특성을 가지고 있지만 복잡한 과도특성을 가지고 있는 메탈핼라이드 램프를 자동차에 적용하기 위해 디지털 제어방식을 전자식 안정기에 적용하여 램프 요구조건 및 주변 환경에 최적으로 적용할 수 있도록 전자식 안정기를 설계하였다. 또한, 주변의 빛의 세기에 따라 램프의 양단전압을 단계별로 가변 제어하는 조광시스템을 구현하여, 운전자에게는 보다 효율적인 운전여건을 만듬과 동시에 한정된 에너지를 가진 밧데리로 운전하는 자동차에서 효율적인 전력제어를 실현하였다. 개발된 안정기에 대한 동작특성을 시뮬레이션과 실험을 통해 확인하였다.