CHAPTER 2 – POWER ELECTRONICS AND CABINET FEATURES 36
2.3.3 AFE - Active front end
The active front end of the drive consists of an rec-
tifier for four quadrant operation. The AFE features
the same electrical design as the INU of the drive.
The AFE rectifies the AC line voltage of the main
power supply and connects its output to the
minus, neutral point and plus side of the DC link.
The AFE maintains the DC-link voltage at the
required level and provides the desired input
power factor at the point of common coupling
(PCC). The input power factor is adjusted by the
AFE to near unity.
2-5 AFE - Active front end
IFU
AFE DC link
INU
EMC filterTransformer
Utility
Energy flow in driving mode
Energy flow in braking mode
Customer
PCC
M
1
2
3
4
Phase module 1
Phase module 2
Phase module 3
Extracted phase module
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