| Summary: | 碩士 === 建國科技大學 === 電機工程系暨研究所 === 104 === In this thesis, implementation of an asymmetrical half-bridge forward converter with a variable resonant inductor. This converter has a simple structure, low stress power switch and smooth switching characteristic, purpose to achieve zero-voltage switching use resonant inductor and resonant capacitor. For asymmetrical half-bridge topology, when this converter operation works on low duty, it’s difficult to reach the zero voltage switching.
In this paper, the use of magnetic element material saturation characteristic, changing resonant inductor core volume, the resonant inductor value can change automatically as the load changes, therefore converter in a very low duty and easy to reach zero voltage switching, the both low cost and volume fixed the advantages.
According to finite element simulation software COMSOL multi-physics is used for the aided design of resonant inductor in order to realize. Actual finish it designs of an asymmetrical half-bridge forward converter with a variable resonant inductor. At light load is efficiency of 77.8%, than conventional resonant inductor efficiency higher than 2.5%, then light-load 20W, is efficiency of 92.8%, full load 150W is efficiency of 90.4%, this verification analysis theory feasibility.
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