20 Operation principle and hardware description
There are two control modes for the upper leg thyristor firing: the charging mode and the
normal mode:
•
The charging mode is in operation a short period after the power switch on: the supply
control program controls the thyristor firing angle gradually towards zero while the
intermediate circuit capacitors located in the inverter module(s) get charged.
•
In the normal mode, the thyristor firing angle is 0 degrees: The thyristors operate as
diodes.
Main circuit diagram
The following figure shows the simplified main circuit diagram of the rectifier bridge.
Description
1.
Diodes. The diodes connect the AC terminals in cyclic sequence to the lower DC busbar (-).
2.
Thyristors. The thyristors connect the AC line terminals in cyclic sequence to the upper DC busbar (+).
3.
Inbuilt AC chokes
4.
DC fuses
+
-
U
c
+
-
U
c
2
1
3
4
4
Содержание ACS880-304 +A018
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