High-Voltage Gain Quasi-SEPIC DC-DC Converter

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...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2019-06, Vol.7 (2), p.1243-1257
Main Authors: Siwakoti, Yam P., Mostaan, Ali, Abdelhakim, Ahmed, Davari, Pooya, Soltani, Mohsen N., Khan, Md. Noman Habib, Li, Li, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Boost converter
Computer simulation
Converters
coupled inductor
DC-DC power converters
dc–dc converter
Efficiency
Electric potential
flyback transformer
High voltages
High-voltage techniques
Inductors
MOSFETs
Reliability analysis
SEPIC converter
switched-mode power supply
Switches
Topology
Voltage gain
Voltage measurement
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Summary: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 R_{\mathrm {DS}-\mathrm{\scriptscriptstyle 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 this 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.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2018.2859425