Rack-Mounted DC Power Supply System Utilizing Li-Ion Batteries for Backup

Toshio MATSUSHIMA  Shinya TAKAGI  Seiichi MUROYAMA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.11   pp.4353-4359
Publication Date: 2005/11/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.11.4353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Energy in Electronics Communications
Keyword: 
DC power supply system,  lithium-ion cell,  floating charge,  cell-voltage equalizing unit,  

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Summary: 
A rack-mounted DC power-supply system utilizing Li-ion batteries, which have higher energy density than conventional VRLA batteries, was developed. The system was designed to have the management functions of Li-ion batteries, such as overcharge protection, over-discharge protection, and cell-voltage equalization, by taking operational requirements into consideration. The volume and weight of the entire system were decreased to one-fourth and three-fifths, respectively, of the volume and weight of a conventional system, making the proposed system ideal as a high-energy-density backup power supply. The functions, system configuration, and characteristics of this rack-mounted DC power supply system utilizing Li-ion batteries are described.