An integrated flyback converter for DC uninterruptible power supply

Author

Ma, Kwok-wai ; Lee, Yim-Shu

Author_Institution

Dept. of Electron. Eng., Hong Kong Polytech., Kowloon, Hong Kong

fYear

1994

fDate

13-17 Feb 1994

Firstpage

661

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 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 converter are presented

Keywords

battery chargers; insulated gate field effect transistors; power convertors; power transistors; secondary cells; semiconductor switches; switched mode power supplies; switching circuits; uninterruptible power supplies; DC output; DC uninterruptible power supply; DC-DC power conversion; HF switching; SMPS; UPS; backup battery; charging; cost; design; efficiency; integrated flyback power converter; magnetic structure; size; switch-mode power supply; switching transistors; Batteries; Costs; Frequency conversion; Low voltage; Magnetic circuits; Magnetic switching; Switched-mode power supply; Switching circuits; Switching converters; Uninterruptible power systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition, 1994. APEC '94. Conference Proceedings 1994., Ninth Annual

Conference_Location

Orlando, FL

Print_ISBN

0-7803-1456-5

Type

conf

DOI

10.1109/APEC.1994.316335

Filename

316335