| Summary: | 碩士 === 建國科技大學 === 電機工程系暨研究所 === 98 === Nowadays the impact of greenhouse effect is more and more increasing. As a result, development of renewable energy is more urgent. On the other hand, the continuous world unbalance between demand and supply of conventional energy has caused the persistent energy cost increase, energy saving has become a trend. World certification institutions such as Energy Star, 80 Plus, Eup and Top Runner have established more strict efficiency standard for electronics equipments. Increase the efficiency and improve the power factor have become the common requirements of the power supply. Furthermore, a highly reliable and uninterruptible power supply is required, especially for dedicate electronic equipments, such as medication instrument, communication unit and computer. Multi-module parallel operation is a trend for these products since it can reduce the component stress, heat dissipation difficulty and cost.
The objective of this thesis is to develop a power supply with high efficiency, high power factor and multi-module operation capability. The front stage adopts the boost power factor correction rectifier. The half-bridge LLC resonance circuit is utilized as the DC-DC converter to achieve low switching loss and relatively high power density characteristics. The automatic interleaved current sharing method is adopted to achieve equal current sharing of multiple power supplies. Analysis and design of these converters are developed in this thesis. Simulation and experimental results are provided to demonstrate the effectiveness of the proposed methods.
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