| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 93 === Abstract
Because of their much higher luminous efficacy, better color rendition, and longer lifetime, High Intensity Discharge (HID) lamps have been used in various commercial and industrial applications such as street lighting, LCD projectors, and automotive headlights. The conventional commercial electronic ballast for driving HID lamps consisted of a front-end DC/DC converter and a low-frequency DC/AC inverter. The front-end DC/DC converter is usually a Flyback converter that draws power from a low-voltage source (i.e. battery or fuel cell) and feeds a high-voltage DC bus for the post-stage DC/AC inverter. The DC/AC inverter is operated at low frequency to avoid acoustic resonance. The low-frequency electronic ballast is large and heavy. This thesis presents a single-stage high frequency electronic ballast for HID lamps. This studied ballast consists of a phase-shifted ZVT full-bridge inverter, a boost transformer, a resonant tank and a high voltage igniter. The proposed electronic ballast has the advantages of high power density, simple circuit and low cost. The circuit operating principles and design criteria are described in detail. A laboratory prototype was built and tested. The simulation and experimental waveforms verify the feasibility of the proposed scheme.
Keywords�o High Intensity Discharge Lamps, Single-Stage High Frequency Electronic Ballast, Phase-Shifted ZVT Full-Bridge Inverter
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