Puls CP Series - Parallel Use for Redundancy

CP10.241-60
CP-Series
24V, 200W, DC/DC CONVERTER
P R E L I M I N A R Y
24.7. PARALLEL USE FOR REDUNDANCY
DC/DC converters can be paralleled for redundancy to gain higher system availability. Redundant systems require a
certain amount of extra power to support the load in case one DC/DC converter unit fails. The simplest way is to put
two DC/DC converters in parallel. This is called a 1+1 redundancy. In case one DC/DC converter unit fails, the other one
is automatically able to support the load current without any interruption. Redundant systems for a higher power
demand are usually built in a N+1 method. E.g. five power supplies, each rated for 8.3A are paralleled to build a 33.2A
redundant system.
For N+1 redundancy the same restrictions apply as for increasing the output power, see also section 0.
Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in
the secondary side of the DC/DC converter. In such a case, the defective unit becomes a load for the other power
supplies and the output voltage can not be maintained any more. This can be avoided by using redundancy modules.
Recommendations for building redundant power systems:
- Use separate input fuses for each DC/DC converter.
- Monitor the individual DC/DC converter units. Use the DC-OK relay contact of the CP10 DC/DC converter.
- It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.
Fig. 24-6 Redundant power design utilizing the
YR20.242 redundancy module
Fig. 24-7 Redundant power design utilizing the YR20.246
redundancy module with automated load sharing
+
-
PE
max.
8.3A
Load
Failure
Monitor
I
YR20.242
Redundancy
Module
Output
Input
1
Input
2
+ +
- -
+
-
optional
DC/DC
Converter
24V, 8.3A
DC-
OK
++
--
PE
Output
Input
o
o
+
-
I
DC/DC
Converter
24V, 8.3A
DC-
OK
++
--
PE
Output
Input
o
o
+
-
max.
8.3A
Load
Load
Share
Warning
I
optional
DC/DC
Converter
24V, 8.3A
++
--
LNPE
Output
Input
DC-
OK
o
o
I
YR20.246
Redundancy
Module
Output
1
Input
2
Input
++
--
+
-
Load Share
OK
o
o
Redudnadcy
OK
o
o
Failure
Monitor
DC/DC
Converter
24V, 8.3A
++
--
LNPE
Output
Input
DC-
OK
o
o
+
-
PE
May 2017 / Rev. 0.1 DS-QS10.241-60-EN preliminary
All parameters are typical values specified at 24V, 8.3A output, 110Vdc input, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
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