دانلود رایگان مقاله انگلیسی بهره ولتاژ بالای مبدل DC-DC شبه SEPIC - نشریه IEEE 2018

Abstract

This paper proposes a modified coupled-inductor SEPIC dc-dc converter for high voltage gain (? < ? < 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 (? > 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.

VI. CONCLUSION

An efficient and high voltage gain modified coupled-inductor SEPIC dc-dc converter has been introduced in this paper with detailed theoretical explanations. Additionally, steady-state analysis and mathematical derivations of the proposed converter has been shown sequentially. Compared to equivalent topologies with similar voltage gain expression, the proposed topology uses lower component-counts to achieve the same or even higher voltage gain. This helps to design a very compact and light-weight converter with higher power density and reliability. The voltage stress on the switch is minimal, which helps the designer to use a low voltage and RDS-on MOSFET, resulting in a reduction in cost, conduction losses and turn ON losses of the switch. Simulation and experimental results have verified these features in addition to practicality of the proposed converter for various power applications. The measured efficiency of the converter over a wide range of load is above 95% with a peak efficiency of 96% at a voltage gain of 10, which is comparatively higher than the conventional converter having similar voltage gains and power levels. These demonstrated performances clearly show the proposed topology as a competitive alternative for a practical application where a high voltage gain is demanded, such as for a fuel cells, PV and high voltage Light Emitting Diode (LED) lamps.