| Summary: | 碩士 === 義守大學 === 電機工程學系碩士班 === 96 === Automobiles are commonly used as transportation tools in Taiwan. Good headlights for automobiles are important to drivers, especially in the case of nighttime or poor weather conditions. The automotive HID (High Intensity Discharge) lamps provide higher luminous efficiency, higher luminous intensity, better color rendering and longer lamp life compared with traditional halogen lamps. In order to supply high intensity and high quality headlights, automotive HID lamps recently have begun to be used as headlamps in high-class import and domestic automobiles.
The life time of automotive xenon lamp is longer when xenon lamp is driven with negative voltage. The conventional two-stage negative-voltage-driven electronic ballast for automotive xenon lamps consists of a flyback converter and a full-bridge inverter with a higher voltage rating of power switch and lower efficiency. Therefore, this thesis presents a two-stage negative-voltage-driven electronic ballast for automotive xenon lamps. Moreover, a micro-controller is designed and built to drive the ballast and realize the constant power control of the lamp. A electronic ballast which consists of a buck-boost-flyback converter and a full-bridge inverter along with a single-stage igniter, is proposed in the thesis. In addition, a micro-controller is utilized to regulate the steady-state lamp power. The advantages of the buck-boost-flyback converter are higher efficiency, lower voltage rating of power switch. A prototype ballast for a 35W automotive xenon lamp with features of constant lamp-power control is successfully built and measured, the experimental results are with IsSpice simulations to verify the functionalities of the presented ballast.
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