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Uninterruptible battery backup for IBM AS/400 systems

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1 Author(s)
Steele, S.W. ; IBM Server Group, 3605 Highway 52 N, Rochester, Minnesota 55901, USA

This paper describes the architecture and implementation of a DC-Uninterruptible Power Source (DC-UPS) designed as an internal component for IBM AS/400® processor and I/O towers. This DC-UPS supports a processor or I/O tower requiring a maximum of 3100 watts of input ac line power. Unlike the large majority of AC-Uninterruptible Power Sources (AC-UPSs) found in the marketplace, which supply 50–60-Hz alternating current, the DC-UPS supplies direct current as the backup power source to the power supplies of these IBM systems. This paper addresses the way in which the IBM DC-UPS design evolved, and how the DC-UPS is less complex, more reliable, and less costly than AC-UPS designs. It also discusses some of the design considerations required to maintain and manage a large battery string in an IBM computer system.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:45 ,  Issue: 6 )