An Application of Lossless Snubber Circuit for Flyback-Forward Boost Converter with Leakage Inductor Energy Recovery

Document Type : Original Article

Authors

1 Department of Electrical Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

2 Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

Abstract

In this paper, an interleaved fly-back-forward boost converter with a new auxiliary circuit was presented. An auxiliary circuit with a low number of elements provided zero voltage switching conditions to turn the switches on and off; besides, the energy of the transformer leakage inductance was properly absorbed by the auxiliary circuit and prevented voltage spikes on the switch. Furthermore, the third winding in the auxiliary circuit not only transfered the energy of the auxiliary circuit to the output but also caused a complete discharge of the snubber capacitors of the main switches in the resonance process. This auxiliary circuit could be expanded, and the number of auxiliary switches did not increase with the addition of converter branches. The performance of the proposed converter was fully analyzed, and a 120 W laboratory prototype was implemented to demonstrate its correct operation. The results showed a 6.5% increase in the efficiency compared with the converter without an auxiliary circuit.

Keywords

Main Subjects

References

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Energy Engineering and Management
Volume 13, Issue 3
December 2023
Pages 78-91

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