ICS1700A Datasheet, PDF (4/24 Pages) List of Unclassifed Manufacturers – QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries

ICS1700A
Initial Pulse
Width
Initial Pulse
Width
increment
time
Initial Pulse
Width
2 x increment
time
cycle time
cycle time
cycle time
Figure 3: Cycle-to-cycle increase of the soft-start current pulse widths
Fast Charge
In the second stage, the ICS1700A 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.
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 ICS1700A can be set for four
user-selectable fast charge rates from 15 minutes (4C) to two hours
(C/2). Charge pulses occur approximately every second. The CMN
indicator is activated continuously during this stage.
fast charge pulse width
rest
rest
voltage
time
time acquisition time
discharge pulse width
cycle time
Figure 4: Charge cycle showing charge and discharge current pulses
4