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18 Operation principle and hardware description
￭
Main circuit diagram
The DC/DC converter module must be equipped with external DC fuses. You can equip the
converter with a DC switch/disconnector, if quick isolation of the module from the DC bus
is required.
This figure shows a simplified main circuit diagram of a DC/DC converter without a DC
switch/disconnector and charging circuit.
1
L+
L-
1
Drive DC bus
2
DC/DC converter module
3
Filter module
4
Energy storage
This figure shows a simplified main circuit diagram of a DC/DC converter with the DC
switch/disconnector and charging circuit.
1
2
L+
L-
6
1
Drive DC bus
2
DC switch/disconnector
3
DC/DC converter module
4
Filter module
5
Energy storage
6
Charging components
2
U2
+
V2
_
W2
3
+
_
3
U2
V2
W2
4
U2
U2
V2
V2
W2
W2
ES+1
ES+
ES+2
ES+3
ES-
ES+1
ES
ES+2
ES+3
ES
4
5
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