TELEFUNKEN Semiconductors Rev A3 Nov
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Description

U2402B TELEFUNKEN Semiconductors Rev. A3, 14-Nov-96 1 (17) Fast Charge Controller for NiCd/NiMH Batteries Description The fast-charge battery controller circuit, U2402B, uses bipolar technology. The IC enables the designer to create an efficient and economic charge system. The U2402B incorporates intelligent multiple-gradient battery- voltage monitoring and mains phase control for power management. With automatic top-off charging, the integrated circuit ensures that the charge device stops regular charging, before the critical stage of overcharging is achieved. It has two LED driver indications for charge and temperature status. Features Multiple gradient monitoring Temperature window (Tmin/Tmax) Exact battery voltage measurement without charge Phase control for charge-current regulation Top-off and trickle charge function Two LED outputs for charge status indication Disabling of d2V/dt2 switch-off criteria during battery formation Battery-voltage check Applications Portable power tools Laptop/notebook personal computer Cellular/cordless phones Emergency lighting systems Hobby equipment Camcorder Package: DIP18, SO20 Gradient d2V/dt2 and –dV 5 (5) Sync R Phase control 18 (20) 17 (19) 16 (18) Power supply VS = 8 to 26 V Trigger output Vi Power - on control VRef 6.5 V/10 mA 14 (15) Oscillator 160 mV Ref Temp.

  • output

  • off charge

  • multiple-gradient battery- voltage

  • vbatt battery

  • charge current

  • phase control

  • features multiple

  • dt2


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Nombre de lectures 19
Langue English

Exrait

U2402B
Fast Charge Controller for NiCd/NiMH Batteries
Description
The fast-charge battery controller circuit, U2402B, uses management. With automatic top-off charging, the
bipolar technology. The IC enables the designer to create integrated circuit ensures that the charge device stops
an efficient and economic charge system. The U2402B regular charging, before the critical stage of overcharging
incorporates intelligent multiple-gradient battery- is achieved. It has two LED driver indications for charge
voltage monitoring and mains phase control for power and temperature status.
Features Applications
Multiple gradient monitoring Portable power tools
Temperature window (T /T )min max Laptop/notebook personal computer
Exact battery voltage measurement without charge
Cellular/cordless phones
Phase control for charge-current regulation
Emergency lighting systems
Top-off and trickle charge function
Hobby equipment
Two LED outputs for charge status indication
2 2 CamcorderDisabling of d V/dt switch-off criteria
during battery formation
Battery-voltage check Package: DIP18, SO20
11 (12)18 (20) 17 (19) 16 (18) 14 (15) 13 (14) 12 (13)
Sync VR RefC
Oscillator
6.5 V/10 mA Status control 3 (3)Phase control
V i
Scan path4 (4)
Control unit
1 (1) BatteryTrigger output
detection
V = 5 VGradient Ref
2 2d V/dt and –dV 10 (11)
Power - on control
V MonitorBatt
0.1 to 4 V
15 (17)
Power supply
160 mV
Temp. controlV = 8 to 26 V Charge break2 (2) S Ref
T Sensor outputmax
5 (5) 7 (8) 8 (9)94 8585 6 (6) 9 (10)
( ) SO 20, Pins 7 and 16 NC
Figure 1. Block diagram
TELEFUNKEN Semiconductors 1 (17)
Rev. A3, 14-Nov-96
U2402B
Pinning Pin Description
Package: DIP18 Pin Symbol Function
1 Output Trigger output
2 GND Ground181 VOutput sync
3 LED2 Display output Green”
GND 2 17 4 V Phase angle control input voltageiC
5 OP Operational amplifier outputO
LED2 3 16 6 OP Operational amplifier inputR I
7 T Maximum temperaturemax
4 15V 8 Sensor Temperature sensori VS
9 t Charge break outputp
OP 5 14O V 10 V Battery voltageRef Batt
11 LED1 LED display output Red”
OP 6 13I Osc 12 S Test mode switch (status control)TM.
13 Osc Oscillator
Tmax 7 12 STM. 14 V Reference output voltageRef
15 V Supply voltageS
Sensor 118 LED1
16 Ramp current adjustment – R
resistance
tp 9 10 V 17 Ramp voltage – capacitanceBatt C
93 7723 e
18 V Mains synchronization inputsync.
Package: SO20 Pin Symbol Function
1 Output Trigger output
20 2 GND Ground1 VOutput sync
3 LED2 Display output Green”
19GND 2 4 V Phase angle control input voltageC i
5 OP Operational amplifier outputO
LED2 3 18 6 OP Operational amplifier inputR I
7 NC Not connected
V V4 17i S 8 T Maximum temperaturemax
9 Sensor Temperature sensor
5 16 NCOP 10 t Charge break outputO p
11 V Battery voltageBatt
6 15 VOP RefI 12 LED1 LED display output Red”
13 S Test mode switch (status control)TM.
OscNC 7 14 14 Osc Oscillator
15 V Reference output voltageRef
T 13 S8 TM.max 16 NC Not connected
17 V Supply voltageS
9 12 LED1Sensor
18 Ramp current adjustment – R
resistance
t 10 11 Vp Batt 19 Ramp voltage – capacitanceC
20 V Mains synchronization input94 8594 sync.
2 (17) TELEFUNKEN Semiconductors
Rev. A3, 14-Nov-96
U2402B
Figure 2. Block diagram with external circuit (DIP pinning)
TELEFUNKEN Semiconductors 3 (17)
Rev. A3, 14-Nov-96
jjj
D
4
Mains
D R
D
8
5
1
100 k
R
2
1 k
T
From
From Pin 15
1
0.1 F
R
R / R
5
BC 308 T1
R 10 T2 V
1
S
D C
6
6
1 k
R 560 k
10 k D D
D Th1 R
13 0.22 F 7 8
2 10
Green
R 10 nF Red
2x 0
R C
3 3
560
R
4
270 k
C
D C 0
R 2.2 k 10 nF
2
11
3
Th2
R
7 17 16 14 13 12 11
R 18
9
1 k
10 k
Sync
V
C R
Ref
Oscillator
3
Status
6.5 V/10 mA
Phase control
control
V
i
To Pin 4
Scan path
Control unit
1
Battery
R R
Trigger output
B2 B1
detection
Gradient
V = 5 V
Ref
C C 10
10 k 1 k
V
7
1
S 15
2
2
d
V/dt & –dV
Power supply
V Monitor
I Batt
4.7 F ch 2
V = 8 to 26 V
470 F
S
0.1 to 4 V
16 k
R
B3
160 mV
Temp. control
Power on
Ref Charge break
control output
T
max Sensor
Battery
NTC
DC
(4 cells)
4
5 6 7 8 9
1 F 1 F
R 12 k
T1
To V (Pin 14)
Ref
160 mV
R R
R
sh
6 T3 R
C
T2
R C
4
C
24 k
10 k 8 100 k
0.2
0.1 F
94 8674U2402B
General Description
The integrated circuit, U2402B, is designed for charging charge current or with NiMH batteries where weaker
Nickel-Cadmium (NiCd) and Nickel-Metal-Hydride charge characteristics are present multiple gradient con-
(NiMH) batteries. Fast charging results in voltage lobes trol results in very efficient switch-off.
when fully charged (figure 3). It supplies two identifica-
2 2 An additional temperature control input increases nottions (i.e., + d V/dt , and – V) to end the charge
only the performances of the charge switching character-operation at the proper time.
istics but also prevents the general charging of a battery
As compared to the existing charge concepts where the whose temperature is outside the specified window.
charge is terminated after voltage lobes according
A constant charge current is necessary for continuedto – V and temperature gradient identification, the
charge-voltage characteristic. This constant current regu-U2402B-C takes into consideration the additional
lation is achieved with the help of internal amplifier phasechanges in positive charge curves, according to the se-
control and a simple shunt-current control technique.cond derivative of the voltage with respect to time
2 2(d V/dt ). The charge identification is the sure method of
All functions relating to battery management can be
switching off the fast charge before overcharging the bat-
achieved with DC-supply charge systems. A DC-DC-
tery. This helps to give the battery a long life by hindering
converter or linear regulator should take over the function
any marked increase in cell pressure and temperature.
of power supply. For further information please refer to
Even in critical charge applications, such as a reduced the applications.
Battery insertion
V10
5 V
Gradient recognition
2d V
2dt
Battery – V
voltage
check
2d V– V, , active
2dt
– V
monitoring shorted batteries ignored
t
95 10172 Fast charge rate IO
Top off Trickle
Battery
charge rate charge rate
formation
1/4 I 1/256 IO O
t = 5 min t 20 min1 2
Figure 3. Charge function diagram, f = 800 Hzosc
4 (17) TELEFUNKEN Semiconductors
Rev. A3, 14-Nov-96
U2402B
Flow Chart Explanation, f = 800 Hzosc
(Figures 2, 3 and 4)
Battery pack insertion disables the voltage lock at battery Top-Off Charge Stage
detection input Pin 10. All functions in the integrated
2 2circuit are reset. For further description, DIP-pinning is By charge disconnection through the +d V/dt mode, the
taken into consideration. device switches automatically to a defined protective
top-off charge with a pulse rate of 1/4 I (pulse time,O
t = 5.12 s, period, T = 20.48 s).p
Battery Insertion and –dV Monitoring
The top-off charge time is specified for a time of
20 minutes @ 800 Hz.The charging procedure will be carried out if battery
insertion is recognised. If the polarity of the inserted
battery is not according to the specification, the fast
charge rate will stop immediately. After the polarity test, Trickle Charge Stage
if positive, the defined fast charge rate, I , begins for theO
first 5 minutes according to –dV monitoring. After
When top-off charge is terminated, the device switches
5 minutes of charging, the first identification control is automatically to trickle charge with 1/256 I (t = 5.12 s,O p
executed. period = 1310.72 s). The trickle continues until the
battery pack is removed.If the inserted battery has a signal across its terminal of
less than 0.1 V, then the charging procedure is interrupted.
This means that the battery is defective i.e., it is not a
rechargeable battery – shorted batteries ignored”. Basic Description
Voltage and temperature measurements across the battery
are carried out during charge break interval (see figure 6), Power Supply, Figure 2
i.e., currentless or idle measurements.
The charge controller allows the direct power supply of
If the inserted battery is fully charged, the –dV control 8 to 26 V at Pin 15. Internal regulation limits higher input
will signal a charge stop after six measurements voltages. Series resistance, R , regulates the supply1
(approximately 110 seconds). All the above mentioned current, I , to a maximum value of 25 mA. SeriesS
functions are recognised during the first 5 m

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