ICS1722M GALAXY [Galaxy Power, Inc.], ICS1722M Datasheet - Page 4

• Manufacturer Part Number: ICS1722M
• Description: QuickSaver-R Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries
• Manufacturer: GALAXY [Galaxy Power, Inc.]

ICS1722
Fast Charge
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
until the batteries are fully charged.
Initial Pulse
Width
Figure 3: Cycle-to-cycle increase of the soft-start current pulse widths
cycle time
Figure 4: Charge cycle showing charge and discharge current pulses
fast charge pulse width
Initial Pulse
Width
cycle time
cycle time
increment
time
4
The amplitude of the current pulse is determined by system
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
indicator is activated continuously during this stage.
time
rest
Initial Pulse
Width
time
rest
cycle time
discharge pulse width
2 x increment
time
acquisition time
voltage