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Fig. 14
Figure 14 illustrates a method of paralleling DC-DC converters for redundant use - increasing the reliability of a system. Diodes
are connected to the positive side of each unit's output. This connection is only for use in redundant systems, where the
maximum current requirement can be handled by one unit alone, and allows the system to continue to operate even when one
unit fails. Also see the Meanwell DRDN20 for 20A and the DRDN40 for 40A applications. These modules provide a DC OK
indication and alarm relay contacts.
Operation in Series
DC-DC converters are often connected in series to produce higher voltages. Two types of series connections are described
below. For series operation all DC-DC converters require 'floating' or isolated outputs!
a. Fig. 15 describes a sample setup for separate distinctive loads. Protective diodes (D1 and D2 below) may be necessary with
this type of application to protect the units if connection X is lost.
Fig. 15
b. Fig. 16 illustrates a sample setup for series connected DC-DC converters. The diode, connected directly across the output
terminals, is also recommended in any application where a reverse voltage may be applied to the unit's output. As a general
guide, the diodes should be Schottsky Barrier with a reverse voltage more than twice the output voltage and rated output current
more than twice the rated output current or short-circuit current whichever is greater.
Fig. 16
