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

Author

Zhang, Junjun ; Wu, Hongfei ; Xing, Yan ; Sun, Kai ; Ma, Xudong

Author_Institution

Jiangsu Key Lab. of New Energy, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China

fYear

2011

fDate

17-22 Sept. 2011

Firstpage

3968

Lastpage

3973

Abstract

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.

Keywords

MOSFET; power convertors; zero current switching; zero voltage switching; MOSFET; ZVS; boundary-conduction-mode; control strategy; current ripple; current stress; high step-up applications; high step-up conversion applications; power 230 W; two-channel interleaved parallel-input-series-output BFC; variable frequency soft zero voltage-switching boost-flyback converter; voltage 30 V; voltage 380 V; Capacitors; Inductance; Stress; Switches; Voltage control; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2011 IEEE

Conference_Location

Phoenix, AZ

Print_ISBN

978-1-4577-0542-7

Type

conf

DOI

10.1109/ECCE.2011.6064309

Filename

6064309