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Title: Design of a switching mode power supply with UPS features
Authors: Cheng, DKW
Leung, FHF 
Issue Date: 1995
Source: 1995 IEEE TENCON : IEEE Region 10 International Conference on Microelectronics and VLSI : "Asia-Pacific microelectronics 2000" proceedings : November 6-10, 1995, Hong Kong, p. 444-447
Abstract: The proposed circuit integrates a flyback converter and a buck converter to provide a switch-mode power supply (SMPS) with uninterruptible power supply (UPS) features. It can accept a high voltage of main power input and a low voltage of backup battery input. It uses ONE PWM IC-controller for the normal and backup modes of operation so that it does not require a synchronization and a detection circuit for power failure. Therefore, the cost and circuit size will be reduced together. High efficiency can be obtained due to the use of a single DC-DC conversion topology from input to output over the conventional UPS. It can also provide full isolation among the high voltage main power input, the low voltage backup battery input and the voltage output. The prototype circuit was built, and the circuit operation and the experimental results of this converter are presented.
Keywords: Closed loop control systems
Electric batteries
Electric converters
Electric network topology
Electric power supplies to apparatus
Electric transformers
Transformer windings
Publisher: IEEE
ISBN: 0-7803-2624-5
Rights: © 1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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