Single-Stage Soft-Switching AC/DC Converter with Application to Electronic Ballast for Metal-Halide Lamp

• Main Author: 劉志偉
• Other Authors: 張隆國
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/32944094823682130349

碩士 === 國立交通大學 === 電機與控制工程系所 === 93 === Metal-Halide Lamp is one of the High-Intensity-Discharge Lamps. It has stronger advantages in color rendering, lighting efficiency, and lifetime. However, some problems must be solved for designing the ballast of the HID lamp, those are long preheating time, extremely high starting ignition voltage, and acoustic resonance. This thesis proposes a complete design of the electronic ballast for Metal-Halide Lamps. Include three parts: (i) using a single-stage high power factor AC/DC converter in stead of the general two stage topology, in order to simplify the topology, (ii) using the active clamp circuit can recycle the energy trapped in the leakage inductance of the transformer (to keep the switch voltage stress low) and achieve soft switching to reduce the power dissipation to attain high efficiency, (iii) using a full-bridge square wave inverter to avoid the acoustic resonance. The upper current limit and constant power control are designed to protect the Metal-Halide Lamp from burning out.