Analysis and design of asymmetrical half bridge flyback converter
Resource
Electric Power Applications, IEE Proceedings-
Journal
Electric Power Applications, IEE Proceedings-
Pages
-
Date Issued
2002-11
Date
2002-11
Author(s)
Chen, T.M.
Chen, C.L.
DOI
1350-2352
Abstract
The detailed circuit behaviour of the asymmetrical half bridge flyback converter is analysed. The specific relationships between the duty cycle and the different types of energy in the energy storage elements are thoroughly investigated. From the analytical results, the maximum duty cycle is not bounded by 50%, which means that the converter can now be optimally used for the different applications. The zero voltage switching (ZVS) conditions of the power switches are derived. Mathematical equations and design considerations are also given. According to the presented design guidelines, the ZVS operations of the power switches can be maintained from no-load to full-load conditions. A 5 V/20 A prototype has been built to verify the analytical results under real life conditions.
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Type
journal article
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