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A variable frequency soft switching boost-flyback converter for high step-up applications

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5 Author(s)
Junjun Zhang ; Jiangsu Key Lab. of New Energy, Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics, China ; Hongfei Wu ; Yan Xing ; Kai Sun
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This paper proposes a variable frequency zero-voltage-switching (ZVS) digital controlled boost-flyback converter (BFC) to achieve high efficiency and high step-up conversion. With no auxiliary switch introduced, ZVS of the MOSFETs can be achieved and reverse-recovery of diode eliminated naturally by operating the converter in boundary-conduction-mode. With the proposed control, both soft-switching and high efficiency are achieved in a wide load range. To achieve higher step-up ratio, lower voltage and current ripple in both input and output and lower current stress of the switches, a two-channel interleaved parallel-input/series-output BFC is presented. The operation principle and control strategy is analyzed in detail and verified with a 230W 30V to 380V prototype.

Published in:

2011 IEEE Energy Conversion Congress and Exposition

Date of Conference:

17-22 Sept. 2011