Browse Prior Art Database

External 24 Volt DC Battery Unit

IP.com Disclosure Number: IPCOM000113256D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Babcock, RF: AUTHOR [+11]

Abstract

An external 25-minute battery backup unit with rechargeable batteries is disclosed. The unit is designed to work with existing charging circuits with minimal changes. The inter-connecting shielded cables provide the electromagnetic compatibility (EMC) shielding needed for the external unit to be part of the computer EMC enclosure package.

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External 24 Volt DC Battery Unit

      An external 25-minute battery backup unit with rechargeable
batteries is disclosed.  The unit is designed to work with existing
charging circuits with minimal changes.  The inter-connecting
shielded cables provide the electromagnetic compatibility (EMC)
shielding needed for the external unit to be part of the computer EMC
enclosure package.

      Rechargeable batteries are installed in a unit external to the
computer package.  The charging circuits are internal to the computer
package.  Two 8-foot long 1/0 AWG shielded cables connect the
external battery unit to the internal charging circuits.  One cable
connects the positive terminals, and the other cable connects the
negative terminals.  The 1/0 AWG wire size provides a minimal voltage
drop.

      Internal Charging System Interface - The connector interface
between the internal charging circuits and the shielded cables
consists of a power connector to handle the required current and an
EMC clamp to attach the cable braided shield to the computer frame
ground.  The mating connector uses 10 AWG wire to connect the
positive and the negative terminals of the charging circuits.

      External Battery Unit/Interface Description - The external
battery unit contains two rechargeable batteries and an 80 Ampere
fuse between the positive terminal of one battery and the negative
terminal of the other battery.

      The connector interface between the external batte...