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Automatic Charge Rate Adjustment for Multiple Batteries

IP.com Disclosure Number: IPCOM000111527D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Jungling, RS: AUTHOR [+2]

Abstract

The Point-of-Sale terminals are available with multiple capacity, rechargeable batteries used to back up memory power. For optimal charging performance, each battery capacity requires a different battery charge current rate. The circuit described in this article provides a method for delivering the appropriate charge rate to the multiple-battery capacities available.

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Automatic Charge Rate Adjustment for Multiple Batteries

      The Point-of-Sale terminals are available with multiple
capacity, rechargeable batteries used to back up memory power.  For
optimal charging performance, each battery capacity requires a
different battery charge current rate.  The circuit described in this
article provides a method for delivering the appropriate charge rate
to the multiple-battery capacities available.

      Three memory battery back-up options are available on a
Point-of-Sale system; a 2400 mah (ma hour) battery, a 500 mah
battery, or a "no battery" option.  Achieving optimal battery service
life requires that the two different battery sizes be charged at
different constant current charge rates.  The 2400 mah battery
requires a constant current charge rate of 240 ma.  The 500 mah
battery requires a constant current charge rate of 55 ma.

      The power-supply battery charger has a single four-pin
input/output connector designed to provide the correct battery charge
rate for the particular battery size.  A unique battery pack
connector is associated with each of the battery sizes as well as the
"no battery" option (Figure).  The power-supply battery charger
provides two distinct constant current charge rates (185 ma and 55
ma).  The 2400 mah battery pack has a jumper connecting pins 1 and 2.
Therefore, the battery charge rate is the sum of the power-supply
dual charge rates (185 ma + 55 ma = 240 ma).  The 500 mah battery
pa...