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Powering Inverters from DC
It is possible to power inverters from a DC Power source, or to connect the DC Bus of multiple inverters together to
achieve energy savings, since inverters in power driving mode can use power from those that are in regeneration mode.
[1] Connection method
There are several ways for DC bus connection of the inverters. (Examples of 3-phase 200V or 400V class inverter.)
Ø Advantage and disadvantages of each connection method.
Item Contents Advantage Disadvantage
Œ
Connecting to + & - terminal Ÿ No concern for the
rectifier bridge diodes.
Ÿ There will be no inrush
current limiting.
•
Connecting to AC inputs and - terminal Ÿ Integrated inrush current
limiting circuit is used.
Ÿ Rectifier bridge diodes
of the main inverter may
need to be up-sized.
INV #1
M 1
INV #2
M 2
INV #n
M n
DC power
supply
Case 1 : Connected in parallel to a common DC bus
INV #2
M 2
INV #n
M n
AC power
supply
Case 2 : Connected in parallel to an A-fed inverter
INV #1
M 1
+
-
INV #2
M 2
INV #n
M n
AC power
supply
Case 3 : AC & DC Connected together
INV #1
M 1
+
-
DC supply connection methods
INV
M
+
-
ΠConnecting to + and - terminal
INV
M
+
-
• Connecting to AC inputs and - terminal