Title :
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
fDate :
3/1/1996 12:00:00 AM
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;
Journal_Title :
Power Electronics, IEEE Transactions on
