Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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High Efficiency Step-Down Flyback Converter Using Coaxial Cable Coupled-Inductor

  • Kim, Do-Hyun (Dept. of Electrical Engineering, Soongsil University) ;
  • Park, Joung-Hu (Dept. of Electrical Engineering, Soongsil University)
  • Received : 2012.07.11
  • Published : 2013.03.20
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Abstract

This paper proposes a high efficiency step-down flyback converter using a coaxial-cable coupled-inductor which has a higher primary-secondary flux linkage than sandwich winding transformers. The structure of the two-winding coaxial cable transformer is described, and the coupling coefficient of the coaxial cable transformer and that of a sandwich winding transformer are compared. A circuit model of the proposed transformer is also obtained from the frequency-response curves of the secondary short-circuit and of the secondary open-circuit. Finally, the performance of the proposed transformer is validated by the experimental results from a 35W single-output flyback converter prototype. In addition, the proposed two-winding coaxial transformer is extended to a multiple winding coaxial application. For the performance evaluation of the extended version, 35W multi-output hardware prototype of the DC-DC flyback converter was tested.

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References

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