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U2400B
Charging of Batteries with Automatic Pre-Discharge
Description
The monolithic integrated circuit, U2400B, is a bipolar
circuit, designed for automatic recharging of NiCd/
NiMH batteries. It has controlled and defined charging
characteristics for various charging sequences with
*subsequent trickle charge operation. The long life
*Memory Effect of the recharging cell remains intact.
Features
D Three time selections:
0.5 h, 1 h or 12 h with subsequent trickle charge
operation
D Battery temperature and contact monitoring
D Charging interrupt for overvoltage or excessive
temperature
D Automatic pre-discharge possible
D Separate charge- and discharge outputs
D Pulse-width modulation facility of charge- and
discharge current for matching to transformer or
battery data
D Timer clock via mains or internal oscillator
D Reference voltage source
D LED-status output for mode indication
Case: DIP16, SO16L
8 14
16
0.5 Hz
94 9375
11 Mains supply
7
Reference
Open Ref
on off
Test
logic
Mains
synchronization
1
3 200 Hz
Oscillator
2+
Control unit
PWM
Time
Status Discharge Reset
13
Ref 12 h
GND 1 h
Charge
time
selection
Open 0.5 h
Failure – charge mode
II Continue Alternating
15 Ref charging red / green
I Stop
Red
Open charging indicator
Status
display
output
9
Charge
Start
Stop
Charge
output 12
Discharge
stop
0.53 V
+
–6
0.53 V
+
Sensor
monitoring
5
+
– 2.95 V
Event
counter
Vmax
0.53 V
+4
Battery
contact monitoring
+ 0.18 V
10
Discharge
output
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A2, 21-Nov-96
1 (15)

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U2400B
2 (15)
Figure 2.
TELEFUNKEN Semiconductors
Rev. A1, 21-Nov-96

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U2400B
General Description, Figures 2 and 3
The integrated circuit, U2400B, supports specially the
controlled and defined charging of fast NiCd cells.
Varieties of charging time selections, i.e., standard charge
(12 h), quick charge (1 h) or fast charge (0.5 h) are
possible.
Before the charging begins, cell is discharged completely.
* *In this way, the long life Memory Effect of the
recharging cell remains intact. Surveillance is taken over
by control unit for time, thermal and voltage during the
charging and switch-off when the specified capacity is
attained. When switched on, the red LED connected to the
display output (Pin 9) is activated. This is only the case
if no battery is connected. When a battery is inserted with
a minimum voltage of approximately 180 mV at Pin 4,
the pre-discharge phase is then started with a 2 seconds
delay. The discharge output at Pin 10 is activated. This is
indicated by the flashing red LED (see figure 5). The
discharge procedure is stopped with a voltage less than
530 mV (at Pin 6). The following charge phase (charge
output Pin 12 active) is indicated by the flashing green
LED (Pin 9).
After the programmed charging period (Pin 13: 0.5 or 1 h
continuous charge, or 12 h pulsed charge) the trickle
charge phase is reached (figure 4). This trickle charge
mode is indicated by the on-state of the green LED. This
means, the battery has stored the maximum possible
*amount of energy. The outputs display, discharge and
*charge will be set inactive (by temperature, over-
voltage). The timer clock is interrupted during the
inactive phase and in each mode when a limit value
(Pins 4 and 5) is exceeded.
START
Reset
no
Pin 9: “0”
Battery
inserted ?
yes
Pin 9: “open”
Pin 9: Alternating
blinking
yes
Pin 15 = VRef
no
Pin 9: “0”
Trickle charge
Pin 12: “0” pulsed
Pin 10: open
Pin 9: “1”
yes
no Time
t > tmax ?
yes
no Event counter
Z<2?
V < Vmax ?
no
STAND – BY
Increment
event counter
Pin 12: open
Pin 9: open
Pin 10: open
Timer stop
yes
no yes
T < Tmax ?
Discharge
Pin12: open
Pin 9: “0” pulsed
Pin 10 “1”
Timer stop
no
“Discharged”
memory set ?
no
yes
Charge
Pin 12: “1” pulsed
Pin 9: “1” pulsed
Pin 10: open
Timer run
Figure 3. Flow chart
V < Vmin ?
yes
Set “discharged”
memory
94 9377
TELEFUNKEN Semiconductors
Rev. A2, 21-Nov-96
3 (15)