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Browse Prior Art Database

Intelligent Battery Discharge Control

IP.com Disclosure Number: IPCOM000113523D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 111K

Publishing Venue

IBM

Related People

Shimotono, S: AUTHOR

Abstract

Disclosed is a method to efficiently control charging and discharging of the battery of battery-based machine. The battery energy which is generated by a battery in discharge mode is diverted and charged another battery with. By this method, it takes less time to complete discharging battery and then changing battery though the current capacity of charger supplied by AC is not enough to cover both the power consumption of operation mode and one of charging battery.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Intelligent Battery Discharge Control

      Disclosed is a method to efficiently control charging and
discharging of the battery of battery-based machine.  The battery
energy which is generated by a battery in discharge mode is diverted
and charged another battery with.  By this method, it takes less time
to complete discharging battery and then changing battery though the
current capacity of charger supplied by AC is not enough to cover
both the power consumption of operation mode and one of charging
battery.

      The actual energy capacity of battery decreases by degrees as
the battery is alternatively charged and discharged again and again
while the battery is not completely discharged to zero.  This defect
is called "Memory effect".  Once such a inconvenience appears
apparently with one or some of batteries, the user of the machine is
required to discharge the battery to zero before the completion of
charging in order to retrieve the original capacity of the battery.
The machine may decide the timing of the event of discharging since
the memory effect is related to the number of times of charging
before discharging to zero.

      The machine, which has plural batteries whose change/discharge
mode can be controlled individually, at first switches one or some of
the batteries into discharge mode when user requests discharge mode.
At the same time, the rest of the batteries is switched into charge
mode so that the energy generated by the battery in the discharge
mode can be utilized for the charging.  By means of this extra
energy, battery can be charged faster than normal method that all of
the batteries once discharged and then all charged.  Since the
charger supplied by AC mostly supplies its power to the ordinal
operation, the batteries can't obtain enough power source during
their charging under the normal method.

      Fig. 1 indicates the outline of the plural battery system
mentioned above.  In operational mode with AC power, SW2 and SWx3
(e.g., SW14, SW23) are all open.  And optionally SWx1 (e.g.,...