Design and Implementation of a Single-phase Half-bridge On-Line UPS

• Main Authors: Chia-Min Ke, 柯嘉閔
• Other Authors: Jiann-Fun Chen
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/7kw6xs

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 90 === In this thesis, three half-bridge converters are constructed for a single-phase on-line uninterruptible power supply system. The first stage half-bridge converter is used for power factor correction and also produced dc voltage source for the battery charger and inverter. The second stage half-bridge converter is designed as a bi-directional buck-boost converter. The buck converter is used as battery charger to maintain the maximum energy storage in the battery during the utility voltage at normal mode condition. But, the energy stored in the battery is released to the load by the boost converter during the utility power outage condition. The final half-bridge converter modulates the dc voltage to sinusoidal ac voltage and supplies power to load. In addition, the first half-bridge converter can be used a boost converter in which extra batteries can be connected to provide more power to the load during the utility power outage condition. Finally, experimental protocircuits is built to examine the performance of the proposed circuit.