Battery charger for the PUMA T2 hand-held radio
Technical Manual
Functional Description
P/N: 779-0357/02
Revision 04
OTE Proprietary Information
Page 25
In this condition the 95% of the maximum capacity has been reached: this
phenomenon is due to the fact that the capacity of absorbing energy decreases
while reaching the end of the charge.
Then the next charging phase, with impulsive current and reduced mean value
(slow charge), counterbalances such phenomenon and lets the battery be charged
with more effectiveness.
When the fast charging is over the red LED turns off and the green LED is lit. The
slow charging starts and the battery charger supplies an impulsive current (150 mA
mean value). This current optimizes the charging process and it is provided for
sixteen hours, even if in ordinary working conditions the battery reaches its full
charging level after a fraction of this time. After sixteen hours the battery charger
switches automatically to the maintenance mode: a minimum current of about
70mA is provided to the battery in order to compensate for the auto-discharging of
the cells and thus maintaining the charging level previously achieved.
The battery charger is also able to recognize already fully charged batteries. In fact
fully charged batteries, if submitted to further fast charging, show a remarkable
voltage increase at their terminals. If the charging control detects a voltage
increase exceeding a predetermined threshold level, the battery is considered
charged.
3.1.1
BCP2-850 and BCP6-850 technical description
The block diagram in fig. 3.5 is related to the BCP2-850 battery charger. The
description is related to such block diagram; the differences with the BCP6-850
model will be pointed out.
