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This paper proposes a modified coupled-inductor SEPIC dc-dc converter for high voltage gain (2 < G < 10) applications. It utilizes the same components as the conventional SEPIC converter with an additional diode. The voltage stress on the switch is minimal, which helps the designer to select a low voltage and low RDS-on MOSFET, resulting in a reduction of cost, conduction and turn ON losses of the switch. Compared to equivalent topologies with similar voltage gain expression, the proposed topology uses lower component-count to achieve the same or even higher voltage gain. This helps to design a very compact and lightweight converter with higher power density and reliability. Operating performance, steady-state analysis and mathematical derivations of the proposed dc-dc converter have been demonstrated in the paper. Moreover, extension of the circuit for higher gain (G > 10) application is also introduced and discussed. Finally, the main features of the proposed converter have been verified through simulation and experimental results of a 400 W laboratory prototype. The efficiency is almost flat over a wide range of load with the highest measured efficiency of 96.2%, and the full-load efficiency is 95.2% at a voltage gain of 10.
|Journal||I E E E Journal of Emerging and Selected Topics in Power Electronics|
|Number of pages||15|
|Publication status||Published - Jun 2019|
- Boost converter
- dc-dc converter
- flyback transformer
- SEPIC converter
- Switched-Mode Power Supply (SMPS)
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- 1 Finished
Multi-Physics of High Power Density Power Electronic Systems
DFF-Individuelle postdocstipendier : DFF-1333-00034
01/03/2016 → 31/05/2018