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High-intensity discharge (HID) lamps are becoming popular substitutes for halogen lamps in automotive headlamps because of the high lumen/watt ratio and the color of the light. In this paper, a ballast (integrated with a voltage multiplier circuit in the secondary winding of the dc converter transformer) with dimming control is presented. The proposed circuit not only eliminates one auxiliary winding...
It is the purpose of this paper to explore the problem of dimming the HID lamp used in the automotive headlight system. To investigate the relationship between the lamp power and control parameters, a power-dependent HID lamp model is established in this paper. The two methods, dynamic duty-ratio control and dynamic bus voltage control, are analyze and applied in the system. The dynamic bus voltage...
In order to reduce the energy, the dimming control is used in the lighting system. There are many different control methods in the fluorescent lamp, after comparing these methods, a research scheme of dimming control used in the HID ballast is proposed. In addition, the lamp model, dimming range and stability analysis are also analyzed in this paper.
HID lamps offer better efficacy than halogen lamps and hence many cars are being fitted with metal halide HID lamps. The lamps are operated at 35 W in automobiles in all driving conditions. The present paper proposes for the first time the techniques to achieve dimming control by operating the lamp at reduced power to save energy in low-beam driving. The paper investigates the merits of each method...
There are two most important technologies in this century, one is biomedicine and the other is energy technology. Energy issue produced problems or adverse effects in different levels of industry or in living. The Global warming also arouse the awareness of the public in energy saving. Therefore new energy saving technologies are appearing and developing rapidly, at the same time energy regeneration...
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