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Integrated Emergency Power Buffer for Computers

IP.com Disclosure Number: IPCOM000036005D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Blum, A: AUTHOR [+4]

Abstract

An emergency power buffer for computers serves to supply power for several seconds in the event of an interruption or failure of the mains voltage.

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Integrated Emergency Power Buffer for Computers

An emergency power buffer for computers serves to supply power for several seconds in the event of an interruption or failure of the mains voltage.

An inexpensive, reliable emergency buffer makes available the rotational energy stored in a conventional fixed-disk storage known more generally as DASD (direct-access storage device).

DASDs are being increasingly used as compact components which are permanently installed in a computer housing and which, similar to the main storage or the power supplies, are integral parts of the computer. In contrast to a torque transducer, the DASD is not used as a permanent power supply means but as a standby in the event of voltage drops lasting several seconds. Calculations have shown that the rotational energy of a buffer DASD is sufficient to act as an emergency supply for about five seconds. During that period, the DASD continues to function as a data storage at a speed which is reduced by as little as about 10 %. Such a speed variation is readily compensated for and merely leads to a reduced baud rate in data transmission, which is normally controlled by the DASD servo track.

The figure is a schematic of a buffer DASD. The additional component is a generator G which is directly connected to the shaft W of disk pack P. Since during normal operation there is no power output by generator G, no torque is applied to shaft W or motor M. The electrical connection between generator G an...