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Energies 2017, 10(7), 981;

Standby-Loss Elimination in Server Power Supply

KAIST—Korea Advanced Institute of Science and Technology, Deajon 341-41, Korea
Department of Electric Engineering, Myongji Unversity, Yongin-Si 449-728, Korea
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in “Disabling standby converter with phase-shifted full-bridge converter in server power supplies. In Proceedings of the 2013 IEEE ECCE Asia Downunder, Melbourne, Australia, 3–6 June 2013”.
Academic Editor: Gabriele Grandi
Received: 26 April 2017 / Revised: 3 July 2017 / Accepted: 7 July 2017 / Published: 12 July 2017
(This article belongs to the Section Electrical Power and Energy System)
Full-Text   |   PDF [5886 KB, uploaded 12 July 2017]   |  


In a server power system, a standby converter is required in order to provide the standby output, monitor the system’s status, and communicate with the server power system. Since these functions are always required, losses from the standby converter are produced even though the system operates in normal mode. For these reasons, the losses deteriorate the total efficiency of the system. In this paper, a new structure is proposed to eliminate the losses from the standby converter of a server power supply. The key feature of the proposed structure is that the main direct current (DC)/DC converter substitutes all of the output power of the standby converter, and the standby converter is turned off in normal mode. With the proposed structure, the losses from the standby converter can be eliminated in normal mode, and this leads to a higher efficiency in overall load conditions. Although the structure has been proposed in the previous work, very important issues such as a steady state analysis, the transient responses, and how to control the standby converter are not discussed. This paper presents these issues further. The feasibility of the proposed structure has been verified with 400 V link voltage, 12 V/62.5 A main output, and a 12 V/2.1 A standby output server power system. View Full-Text
Keywords: phase-shifted full-bridge converter; standby flyback converter phase-shifted full-bridge converter; standby flyback converter

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kim, J.-W.; Moon, G.-W.; Lee, I.-O. Standby-Loss Elimination in Server Power Supply. Energies 2017, 10, 981.

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