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Design of a switching-mode power supply with UPS features

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2 Author(s)
Cheng, D.K.W. ; Dept. of Electron. Eng., Hong Kong Polytech., Kowloon, Hong Kong ; Chan, W.

The proposed circuit integrates an isolated capacitive idling Cuk power converter and a buck power converter to provide a switch-mode power supply with uninterruptible power supply (UPS) features. From the unique topology of the capacitive idling Cuk power converter, input voltage regulation can be obtained on the primary side, while load current regulation can be performed on the secondary side. In this arrangement, complete isolation can be achieved, and a wider difference in voltages between input mains and a low-voltage backup battery input. In addition, the separation of control provides further advantages such as independent short circuit protection and each output can be regulated independently for multiple output systems. High efficiency, low cost and small size can also be achieved compared with the traditional UPS because it requires only DC-DC conversion in each mode

Published in:

Power Electronics and Drive Systems, 1995., Proceedings of 1995 International Conference on

Date of Conference:

21-24 Feb 1995

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