Battery Charging Control; Backup Battery - Toshiba T1950 User Manual

1.10.2.1

Battery Charging Control

Battery charging is controlled by a microprocessor that is mounted on the power supply. The
microprocessor controls whether the charge is on or off and detects a full charge when the AC
adapter and battery are attached to the computer. The system charges the battery using quick
charge or trickle charge.
When the AC adapter is attached, there are two types of charge: quick charge when the
system is powered off, and trickle charge when the system is powered on. Table 1-11 shows
the charging time period of the main battery.
Quick charge
(power off)
Trickle charge
(power on)
Quick Battery Charge
If one of the following occurs, the battery quick-charge process stops.
1. The battery becomes fully charged
2. The AC adapter or battery is removed.
3. The battery or AC adapter output voltage is abnormal.
4. The charge current is abnormal.
Trickle Battery Charge
When the main battery is fully charged and the AC adapter is attached, the power supply
microprocessor automatically changes quick charge to trickle charge.
1.10.3

Backup Battery

The backup battery maintains data for AutoResume. The power source used to back-up the
AutoResume data is determined according to the following priority:
AC adapter > Main battery > Backup battery
The backup battery is charged by the main battery or AC adapter when the system is powered
on. Table 1-12 shows the charging time and data preservation period of the backup battery.
Table 1-11 Time Required for Battery Charges
Charging time
About 2.3 hours (T1950)
About 1.4 hours (T1950CS/T1950CT)
About 48 hours
1-17