An integrated flyback converter for DC uninterruptible power supply

Author

Ma, Kwok-wai ; Lee, Yim-Shu

Author_Institution

Div. of Energy Syst., Ericsson Ltd., Quarry Bay, Hong Kong

Volume

11

Issue

2

fYear

1996

fDate

3/1/1996 12:00:00 AM

Firstpage

318

Lastpage

327

Abstract

An integrated flyback power converter performing the combined functions of uninterruptible power supply (UPS) and switch-mode power supply (SMPS) is presented. This power converter has a high voltage main power input and a low voltage backup battery input. DC output is obtained from the main input via a flyback power converter during normal operation and from the backup battery via another flyback power converter when input power fails. High conversion efficiency is achieved in normal, backup, and charging modes as there is only a single DC-DC conversion in each mode. The power converter circuit is very simple, with two switching transistors, a relay for mode switching, and a single magnetic structure only. This new design offers substantial improvement in efficiency, size, and cost over the conventional cascade of UPS and SMPS due to single voltage conversion, high frequency switching, and removal of design redundancy. The operation, design, analysis, and experimental results of the power converter are presented

Keywords

DC-DC power convertors; field effect transistor switches; power MOSFET; power field effect transistors; power semiconductor switches; power transformers; secondary cells; switched mode power supplies; switching circuits; uninterruptible power supplies; DC uninterruptible power supply; DC-DC conversion; SMPS; UPS; backup battery; cost; efficiency; high frequency switching; integrated flyback power converter; magnetic structure; mode switching; size; switch-mode power supp; switching transistors; Batteries; Costs; Low voltage; Magnetic circuits; Magnetic switching; Relays; Switched-mode power supply; Switching circuits; Switching converters; Uninterruptible power systems;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.486182

Filename

486182