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http://dx.doi.org/10.6113/JPE.2016.16.2.436

A Novel High Step-Up Converter with a Switched-Coupled-Inductor-Capacitor Structure for Sustainable Energy Systems  

Liu, Hongchen (Dept. of Electrical Engineering and Automation, Harbin Institute of Technology)
Ai, Jian (Dept. of Electrical and Control Engineering, Heilongjiang University of Science and Technology)
Li, Fei (Dept. of Electrical Engineering and Automation, Harbin Institute of Technology)
Publication Information
Journal of Power Electronics / v.16, no.2, 2016 , pp. 436-446 More about this Journal
Abstract
A novel step-up DC-DC converter with a switched-coupled-inductor-capacitor (SCIC) which successfully integrates three-winding coupled inductors and switched-capacitor techniques is proposed in this paper. The primary side of the coupled inductors for the SCIC is charged by the input source, and the capacitors are charged in parallel and discharged in series by the secondary windings of the coupled inductor to achieve a high step-up voltage gain with an appropriate duty ratio. In addition, the passive lossless clamped circuits recycle the leakage energy and reduce the voltage stress on the main switch effectively, and the reverse-recovery problem of the diodes is alleviated by the leakage inductor. Thus, the efficiency can be improved. The operating principle and steady-state analyses of the converter are discussed in detail. Finally, a prototype circuit at a 50 kHz switching frequency with a 20-V input voltage, a 200-V output voltage, and a 200-W output power is built in the laboratory to verify the performance of the proposed converter.
Keywords
Coupled inductor; High step-up voltage gain; Low voltage stress; Switched capacitor;
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