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2-96 Service Guide
2.9.7 Functions Description
2.9.7.1 Charge Function
A. FOR NIMH BATTERY
When the charger module charges a 9 cells NiMH battery, 0V and T/ t, max T and - v detentions
will be used as the main methods to determine the full charged battery. To ensure safety for the
battery and system, fast charging NiMH battery after long period of storage time, the module will
disable 0V detection during a short “ hold-off” period at the start of fast charging. Also when
‘charge in use’ the 0V and -V detection will be disabled during whole charging period.
When system not in use power, the quick charge current will be limited by the Adapter to
1.9A0.1A. If system in use the charge current will be limited by charger module to 0.650.07A.
When battery voltage lower than 1.0v/cell the charger module will precharge the battery (with 1/8
duty cycle/2HZ) and 50/150 minutes maximum timer.
When battery is fully charged, the charger module will offer 25mA 5mA trickle current to maintain
the battery at 100% capacity.
The BT-QCHG pin will send a logic high signal for LED indication by the charger, when precharge
or quick charge is on.
B. FOR LIB BATTERY
When the charger module charges a 9 cells (3’s parallel , 3’s serial) LIB battery. The charger will
offer 1.90.1A charger current when system not in use power whereas 0.650.07A when system in
use power. Quick charge will be terminated when charge current less then 150mA60mA. Then
12.67V 0.05V constant voltage with one hour timer will be applied to charge battery. Also if battery
voltage lower than 7.50.2V the charger will precharge the battery, using 200mA60mA with 2 hours
maximum timer.
When battery is fully charged the charger module stop charge. But the charger module will
recharge the battery if battery voltage lower then 11.4V 0.2V.
The BT-QCHG pin will send a logic high signal for LED indication, when precharge or quick charge
is on.
2.9.7.2 Discharge Function
When system turned on, the charger will check AC power inserted or not . If AC power inserted,
then AC power will be the role of power provider. If not, the charger will discharge the battery
already inserted in the notebook system.
If system in use power when Adapter not inserted and battery voltage lower than BL1 voltage, the
charger module will indicate a battery Low 1 signal . And if battery voltage lower than BL2 voltage
, the charge will indicate a Battery Low 2 signal .