Analysis and design of asymmetrical half bridge flyback converter | Zendy

T.-M. Chen | Zendy; C.-L. Chen | Zendy

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Analysis and design of asymmetrical half bridge flyback converter

Author(s) -

T.-M. Chen,

C.-L. Chen

Publication year - 2002

Publication title -

iee proceedings - electric power applications

Language(s) - English

Resource type - Journals

eISSN - 1359-7043

pISSN - 1350-2352

DOI - 10.1049/ip-epa:20020525

Subject(s) - duty cycle , flyback converter , half bridge , flyback transformer , power (physics) , buck–boost converter , energy storage , control theory (sociology) , voltage , computer science , bridge (graph theory) , energy (signal processing) , capacitor , boost converter , electronic engineering , electrical engineering , topology (electrical circuits) , engineering , mathematics , control (management) , physics , medicine , transformer , statistics , quantum mechanics , artificial intelligence

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 5V/20A prototype has been built to verify the analytical results under real life conditions.

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