| Summary: | 碩士 === 義守大學 === 電機工程學系碩士班 === 95 === This thesis presents a novel two-stage negative-voltage-driven electronic ballast for automobile xenon lamps. Referring to previous literatures, negative-voltage-driven ballast systems contribute to extending lamp-life of automobile xenon lamps. The conventional two-stage negative-voltage-driven electronic ballast for automobile xenon lamps consists of a flyback converter and a full-bridge inverter. When the power switch of the flyback converter turns off, the energy stored in the coupling inductor with secondary winding is unable to totally transfer to the secondary side, and causes lower circuit efficiency. Moreover, the power switch of the flyback converter usually needs an additional snubber circuit to suppress the voltage surge of it.
Therefore, a new kind of electronic ballast, which consists of a buckboost-flyback converter and a full-bridge inverter along with a single-stage igniter is proposed in the thesis. In addition, a constant power controller is utilized to regulate the steady-state lamp power. The advantage of the buckboost-flyback converter is that it recycles energy stored in the coupling inductor with secondary winding of the buckboost-flyback back to the output terminal resulting in higher circuit efficiency. Furthermore, the output voltage of buckboost-flyback converter is negative and suitable for driving the full-bridge inverter as well as the automobile xenon lamp. A prototype ballast for a 35W automobile xenon lamp with features of constant lamp-power control is successfully built and measured, and experimental results are carried out and compared with IsSpice simulations to verify the functionalities of the presented ballast.
|
|---|
