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59
NATIONAL
INSTRUMENTS
5.4 Series Operation
Power supplies of the same model can be connected in series to obtain increased output voltage.
Split connection of the power supplies gives positive and negative output voltage.
WARNING:
When power supplies are connected in series, and the load or one of the output terminals is grounded,
no point may be at a greater potential of +/- 100VDC from ground.
5.4.1 Series Connection for Increased Output Voltage
Two units are connected so that their outputs are summed. Set the current limit of each power
supply to the maximum that the load can handle without damage. It is recommended that diodes
be connected in parallel with each unit output to prevent reverse voltage during start up sequence
or in case one of the units shuts down. Each diode should be rated to at least the power supply
rated output voltage and output current. Refer to Fig.5-1 and Fig.5-2 for series operation with
local and remote sensing.
+S
+
-
-S
-LS
+LS
+S
+
+
-
-
-S
-LS
+LS
+S
+
-
-S
-LS
+LS
+S
+
+
-
-
-S
-LS
+LS
(*)
(*)
(*)
(*)
POWER
SUPPLY POWER
SUPPLY
POWER
SUPPLY POWER
SUPPLY
LOAD
LOAD
(*) Diodes are
user supplied.
Fig.5-1: Series connection, local sensing Fig.5-2: Series connection, remote sensing