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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
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U2400B
A two-stage event counter will be incremented with each
limit value violation. If the event counter stores two inter-
ruptions, subsequent behaviour is determined by the
programming at Pin 15:
D An open circuit at Pin 15 means that the charge mode
has to be cancelled after 2 limit value violation. This
is indicated by a flashing red display.
D If the IC’s internal reference voltage (Pin 7) is
connected to Pin 15, only the display mode changes:
alternating red-green flashing. After the limit value
violation has elapsed, the IC attempts to make up for
the remaining charging period so that the maximum
possible residual capacity will be made available even
if a battery is already damaged.
The timer clock for programmable charging period and
other internal clocks is obtained either from the internal
200 Hz oscillator, figure 6, or from the external mains
synchronization (figure 7). Figure 8 shows that an
external timer clock (via Pin 16) for deviating charging
periods is possible. In this case, the internal oscillator or
mains synchronization must be activated to clock the
control unit.
The negative input of a pulse-width modulator (PWM) is
connected to the ramp oscillator (Pin 3). Pin 2 provides
the positive input for this comparator (figure 9).
Discharge
10
O10
Charge
12
O12
94 9378
mA
I10
100
0
mA
I12
0
–100
mA
I12
0
–100
1.2 s
Discharge
Charge 30 min / 1 h
Charge 12 h
100 ms
mA
I12
0
–100
16.8 s
Trickle charge
100 ms
Figure 4. Discharge, charge outputs
4 (15)
TELEFUNKEN Semiconductors
Rev. A1, 21-Nov-96

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U2400B
If a DC voltage in the range of 0.9 to 2.1 V is supplied to
comparator positive input (Pin 2), the discharge and
charge outputs are deactivated as soon as the oscillator’s
saw-tooth voltage (Pin 3) exceeds the DC voltage at Pin 2
(figures 9, 10 and 11). This pulse-width modulation
*effects the active discharge and charge output in each
mode discharge, charge or trickle charge. This offers
the possibility of matching the r.m.s. current to various
battery capacities by means of a switchable voltage
divider.
Pin 14 must be connected to reference voltage Pin 7, if
the internal clock signals are derived from the mains
synchronization input Pin 1 with simultaneous pulse-
width modulation. The oscillator can then be used
deviating from 200 Hz.
As soon as a battery is removed, the red LED is active
(= no contact). A total pause of approximately 2 seconds
must be given between removing the charged battery and
inserting a new battery to inform the IC that the inserted
battery is to be charged.
mA
I9
10
0
red
No battery contact
mA
I9 green
0
–10
800 ms
green
Charge
200 ms
internal 7
3V
red
9 O9 TLHR 5400
green
mA
I9
10
0
red
mA
I9 0
–10
TLHG 5400
mA
I9
0
800 ms
red Discharge
200 ms
green
Trickle charge
Stand – by
94 9379
mA
I9
10
0
red
mA
I9 10
0
–10
green
200 ms
red
green
200 ms
t
Figure 5. Status display output
Failure function I
Failure with
charge stop
Failure function II
Expired charge
time with
interruption
TELEFUNKEN Semiconductors
Rev. A2, 21-Nov-96
5 (15)