High Efficiency Step-Down Flyback Converter Using Coaxial Cable Coupled-Inductor
- Authors
- Kim, Do-Hyun; Park, Joung-Hu
- Issue Date
- Mar-2013
- Publisher
- KOREAN INST POWER ELECTRONICS
- Keywords
- Coaxial winding; Coupled-inductor; Flyback converter; High efficiency; Multi-output
- Citation
- JOURNAL OF POWER ELECTRONICS, v.13, no.2, pp.214 - 222
- Journal Title
- JOURNAL OF POWER ELECTRONICS
- Volume
- 13
- Number
- 2
- Start Page
- 214
- End Page
- 222
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/11330
- DOI
- 10.6113/JPE.2013.13.2.214
- ISSN
- 1598-2092
- 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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