ICS1722
Initial Pulse
Width
Initial Pulse
Width
Initial Pulse
Width
2 x increment
time
increment
time
cycle time
cycle time
cycle time
Figure 3: Cycle-to-cycle increase of the soft-start current pulse widths
The amplitude of the current pulse is determined by system
Fast Charge
parameters such as the current capability of the charging system,
the desired charge rate, the cell capacity and the ability of that cell
to accept the charge current. The ICS1722 can be set for nine user-
selectable fast charge rates from 15 minutes (4C) to four hours
(C/4). Charge pulses occur approximately every second. The CMN
In the second stage, the ICS1722 applies the charging current in a
series of charge and discharge pulses. The technique consists of a
positive current charging pulse followed by a high current, short
duration discharge pulse. The cycle, shown with charge, discharge,
rest and data acquisition periods in Figure 4, repeats every second
indicator is activated continuously during this stage.
until the batteries are fully charged.
rest
time
rest
voltage
time acquisition time
fast charge pulse width
discharge pulse width
cycle time
Figure 4: Charge cycle showing charge and discharge current pulses
4
GALAXY [ GALAXY POWER, INC. ]
