High Voltage Gain Quasi-SEPIC DC-DC Converter

Yam Prasad Siwakoti, Ali Mostaan, Ahmed Abdelhakim, Pooya Davari, Mohsen N. Soltani, Noman Habib Khan, Li Li, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

24 Citations (Scopus)
997 Downloads (Pure)


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.
Original languageEnglish
Article number8419732
JournalI E E E Journal of Emerging and Selected Topics in Power Electronics
Issue number2
Pages (from-to)1243-1257
Number of pages15
Publication statusPublished - Jun 2019


  • Boost converter
  • coupled-inductor
  • dc-dc converter
  • flyback transformer
  • SEPIC converter
  • Switched-Mode Power Supply (SMPS)


Dive into the research topics of 'High Voltage Gain Quasi-SEPIC DC-DC Converter'. Together they form a unique fingerprint.

Cite this