An Improved Topology of SEPIC Converter With Reduced Output Voltage Ripple

Author

Al-Saffar, Mustafa A. ; Ismail, Esam H. ; Sabzali, Ahmad J. ; Fardoun, Abbas A.

Author_Institution

Dept. of Electr. Eng., Coll. of Technol. Studies, Al-Shaa´´b

Volume

23

Issue

5

fYear

2008

Firstpage

2377

Lastpage

2386

Abstract

An improved version of a single-ended primary inductor converter (SEPIC) is presented. The converter consists of a conventional SEPIC converter plus an additional high-frequency transformer and diode to maintain a freewheeling mode of the DC inductor currents during the switch on state. The voltage conversion ratio characteristics and semiconductor device voltage and current stresses are characterized. The main advantages of this converter are the continuous output current, smaller output voltage ripple, and lower semiconductors current stress compared with the conventional SEPIC converter. The design and simulation of the concept is verified by an experiment with a 48-V input and 12-V/3.75-A output converter.

Keywords

DC-DC power convertors; high-frequency transformers; inductors; power semiconductor diodes; DC inductor currents; SEPIC converter; current 3.75 A; current stress; diode; freewheeling mode; high-frequency transformer; semiconductor device voltage; single-ended primary inductor converter; voltage 12 V; voltage 48 V; voltage conversion ratio; voltage ripple; Circuit topology; Coupling circuits; Electromagnetic compatibility; Filters; Inductors; Magnetic separation; Stress; Switches; Switching converters; Voltage; Active clamp; continuous conduction mode (CCM); dc–dc power conversion; ripple reduction; single-ended primary inductor converter (SEPIC);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2008.2001916

Filename

4689432