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X Series Data Sheet
?
375, 500 Watt AC-DC and DC-DC DIN-Rail Converters
I o / I o nom
1.6
1.4
1.2
1.0
0.8
05194b
allows for connecting a battery-specific temperature sensor,
which provides temperature-controlled adjust of the trickle
charge voltage. This optimizes charging as well as battery life
time. Depending upon the cell voltage and the temperature
coefficient of the battery, different sensor types are available;
see Accessories .
Note : Parallel operation is not possible, if the temperature sensor
is connected to the paralleled outputs Vo+, as the sensor
0.6
- 0.5
0
0.5
1
1.5
2
2.5 s
eliminates the output voltage droop.
However, it is possible to insert bleeding resistors in the Vo+
output lines of each converter in order to create a droop of
Fig. 8
Short term peak power characteristic: overcurrent versus
time (typical values).
approx. 0.6 V @ I o nom for 24 V outputs (1.2 V @ I o nom for 48 V
outputs), but this creates considerable power losses.
Thermal Considerations
Vo+
03099d
The thermal conditions are influenced by input voltage, output
current, airflow, and temperature of surrounding components.
T A max is therefore, contrary to T C max , an indicative value only.
Input
Power
supply
Vo–
R
Load
Caution: The installer must ensure that under all operating
conditions T C remains within the limits stated in the table
Temperature specifications .
Note: Sufficient forced cooling allows T A to be higher than T A max
provided that T C max is not exceeded. It is recommended that
continuous operation under worst case conditions of the
following 3 parameters be avoided: Minimum input voltage,
maximum output power, and maximum temperature.
?
Temperature sensor
+
Battery
Battery Charging and Temperature Sensor
The battery charger models exhibit the option M1 and have
been designed to charge lead-acid batteries. The R-input
Fig. 10
Schematic circuit diagram of a system with battery backup
and temperature-controlled charging.
Cell voltage [V]
2.45
2.40
2.35
2.30
2.25
2.20
2.15 V o safe
06139b
2.10
–20
–10
0
10
20
30
40
50 °C
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. 9
Trickle charge voltage versus temperature for different
temperature coefficients (V o safe with disconnected sensor)
BCD20021-G Rev AC1, 13-May-2013
Page 11 of 21
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