®
Accessories
Temperature Sensors
Description
Power-One offers a wide range of battery charger systems
consisting of adapted power supplies and appropriate
temperature sensors. The (lead-acid) batteries are
charged according to the battery temperature and the
properties of the battery cells. When the battery is fully
charged, it is maintained at the float charge voltage, which
represents the optimum point for maximum available
energy and optimum life expectancy of the battery. It is
essential to place the sensor as close to the battery as
possible thus sensing the battery temperature.
The most suited sensor model is defined mainly by three
parameters: The nominal battery voltage (e.g., 24 V or 48
V), the temperature coefficient of the cells (e.g., –3.0 mV/
K), and the nominal floating charge voltage per cell at
20 °C (e.g., 2.27 V/cell). The latter two are specified in the
data sheet of the battery.
The temperature sensors K can be used with all Power-
One converters with the standard R input. This input
allows the control of the output voltage, see fig. 1. The
open R input exhibits a source voltage of 2.5 V with a
source resistor of 4 kΩ.
The sensor can directly be connected to the R input and is
powered from the battery voltage, as shown in fig. 2. The
sensor supersedes the internal voltage control circuit of
the converter and adjusts the output voltage exactly to what
is needed for the battery.
Note:
Some converters exhibit a current droop characteristic
to ease the operation in parallel connection. If the temperature
sensor K is connected to the R-input, it cancels the droop
characteristic and impedes current sharing. We recommend
the use of converters with true current sharing (option T).
Different models of battery sensors are available
depending on the battery specifications. Table 1 gives an
overview of available sensors.
Note:
Other types for different cell voltages, temperature
coefficients, and cable lengths are available on request.
For example, if the application uses a 48 V battery
consisting of 24 cells of 2.27 V, a temperature coefficient
of – 3.0 mV/K, and 2 m cable length, the sensor type
S-KSMH48-2.27-30-2 should be selected.
Fig. 3 shows the charge voltage depending on the
temperature and the battery type. If the sensor is
Table of Contents
Page
Page
Mechanical Dimensions ................................................ 3
Temperature Sensors for the T Series .......................... 3
Description ..................................................................... 1
Fail Safe Operation ......................................................... 2
Converters with DC Input ............................................... 3
BCD20024 Rev. AA, 03-Sep-2008
Page 1 of 3
www.power-one.com
®
Accessories
Temperature Sensors
Sensor002
Table 1: Sensors for converters with standard R input
Vo+
L
V
ref
= 2.5 V
4 kΩ
Control
circuit
N
R
R
safe
Battery
voltage
nom. [V]
12
24
24
Sensor
type
S-KSMH12-2.27-30-2
S-KSMH24-2.27-30-2
S-KSMH24-2.27-35-2
S-KSMH24-2.31-35-0
S-KSMH24-2.35-35-2
S-KSMH48-2.27-30-2
S-KSMH48-2-27-35-2
Cell
Cell temp. Cable
voltage coefficient length
[V]
[mV/K]
[m]
2.27
2.27
2.27
2.31
2.35
2.27
2.27
– 3.0
– 3.0
– 3.5
– 3.5
– 3.5
– 3.0
– 3.5
2
2
2
4.5
2
2
2
Vo-
24
24
48
48
Fig. 1
Block diagram of Power-One converters suited to
be controled by a battery sensor.
03099d
Input
Power
supply
Vo+
Vo–
R
+
Load
– Sensor
wires
Sensor Temperature
sensor
cable
R
Vo+
+
–
+
white
brown
Fuse
green
Battery
+
–
05174a
ϑ
Vo–
Temperature sensor
Battery
Fig. 2
Block diagram of the sensor.
disconnected, the converter output voltage is regulated to
V
o safe
. This voltage prevents the battery from being
overcharged even at high temperature. Overcharging a
battery is dangerous and can cause the battery to explode.
Fig. 4
Connection of a sensor to the standard R input
Fail Safe Operation
To prevent batteries from overcharging but still maintain a
minimum charging in case of interruption of the sensor
signal cable to the power supply, Power-One offers
converters with a special nominal output voltage setting;
see table 2. These converters differ from the respective
standard models in the nominal output voltage and output
current settings. Without the sensor connected to the R
pin, the output voltage is set to
V
o safe
, which is higher than
the nominal battery voltage such avoiding discharging the
battery, but still lower than the theoretically needed float
Sensor002
Cell voltage [V]
2.45
2.40
06123b
V
o max
2.35
2.30
2.25
2.20
2.15
V
o safe
2.10
–20
L
V
ref
= 2.5 V
4 kΩ
Control
circuit
Vo+
R
R
safe
–10
0
10
20
30
40
50 °C
N
Vo-
V
C
= 2.27 V, –3 mV/K
V
C
= 2.23 V, –3 mV/K
V
C
= 2.27 V, –3.5 mV/K
V
C
= 2.23 V, –3.5 mV/K
Fig. 3
Float charge voltage versus temperature for different
temperature coefficients.
BCD20024 Rev. AA, 03-Sep-2008
Fig. 5
Connection of R
safe
, if standard converter models are
used.
Page 2 of 3
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®
Accessories
Temperature Sensors
Table 2: Special models for battery charging
V
nom
[V]
12
24
36
48
60
V
safe
[V]
12.84
25.68
38.52
51.36
64.2
P
o
= 50 W
LM1781-7R
LOK4140-2RLD
LM1782-7R
LOK4240-2RLD
LM1783-7R
LM1784-7R
LOK4740-2RLD
LM1785-7R
P
o
= 70 W
LH1781-2R
LH1782-2R
LH1783-2R
LH1784-2R
LH1785-2R
P
o
= 100 W
P
o
= 125 W
LS4740-7R
2
LWR1140-6EM1
LS5740-7R
2
LWR1240-6EM1
LWR1840-6EM1
LS5740-7R
1 2
LWR1740-6EM1
LK5740-7R
1
CK2740
1 3
P
o
= 150 W
LK4740-7R
CK1740
3
LK5740-7R
CK2740
3
P
o
= 250 W
LWN1140-6EM1
LKP5740-6R
LWN1240-6EM1
LWN1840-6EM1
LKP5741-5R
LXR1240-6M1
LXN1240-6M1
LXR1840-6EM1
LXN1840-6EM1
P
o
= 280 W
P
o
= 375 W
P
o
= 500 W
LKP5740-6R
1
LKP5741-5R
1
LXR1740-6M1
LWN1740-6EM1
LXN1740-6M1
1
2
3
Both outputs connected in series.
Similar models with DC input (DS/LS1740, DS/LS2740) are available as well.
DC input; DK/LK1740, and DK/LK2740 are available as well.
charge voltage. As soon as the sensor is connected to the
R pin, the output voltage will be set to the correct value.
This is essential for best energy and battery life time.
Other Power-One converters may also be used for battery
charging controled by the temperature sensor. However,
the output voltage at low temperature might not be
reached. If the sensor is used only for decreasing the
output voltage, for instance, if using a 15 V power supply to
charge a 12 V battery, then disconecting the sensor
results in a dangerous situation. We recommend to add a
resistor between the R input and its reference, which
adjusts the output voltage with disconnected sensor to
V
o safe
. This is shown in fig. 5.
For this purpous, DC-DC converters of Q, P, M, S, or K
Series may be used, such as all switching regulators,
provided that they exhibit the standard R input.
For safe operation, we recommend to provide a resistor
R
safe
with the correct value (see fig. 5).
Mechanical Dimensions
All dimensions in mm.
European
Projection
26 (1.02")
09125a
Converters with DC Input
Most of the models listed in table 2 have an AC input.
However, there are applications requiring battery charging
from a DC source – sometimes even without electrical
isolation.
L
56 (2.2")
L = 2 m (standard length)
other cable lengths on request
adhesive tape
Fig. 6
S-KSMH temperature sensor.
Temperature Sensors for the T Series
T Series battery chargers exhibit a cell voltage selector
switch to set the required floating charge voltage directly at
the converter. A special temperature sensor T matches to
the T Series. All details are provided in the T Series data
sheet at Power-One's web site; see
www.power-one.com.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for
use as critical components in life support systems, equipment used in hazardous environments, or nuclear control
systems without the express written consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may
change depending on the date manufactured. Specifications are subject to change without notice.
BCD20024 Rev. AA, 03-Sep-2008
Page 3 of 3
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