• Proceedings of the IEEK Conference
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• 2002.06e
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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.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.3
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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.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.1
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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.

• Proceedings of the IEEK Conference
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• 2003.07b
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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.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.2
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• pp.10-16
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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 half bridge inverter, and igniter using voltage doubler. A prototype was developed and tested on a 35W lamp with a 12V input voltage. To avoiding acoustic resonance the half bridge inverter is operated at 400Hz and provided a squared-wave voltage source to the lamp. The transient and steady state characteristics of the tested HID lapm are measured and analyzed.

• 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.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.4
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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.

• Proceedings of the KIPE Conference
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• 2004.11a
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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.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.49 no.8
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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.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.1
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• pp.24-33
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• 2005

This paper presents dimming control system for automotive 35[W] metal halide discharge(MHD) lamp electronic ballast using digital control method. HID system has been becoming increasingly popular due to its superior performance(high luminous efficacy, good color rendering and long life etc.)over the conventional halogen system. However, this 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, 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 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 simulation results and the experiment results.