off of such currents can cause the destruction of the switches by parasitic effects (e.g.
due to turn-off overvoltage). Therefore, appropriate protection measures have to be
provided for the switches T
. Alternatively, the short circuit may be
mitigated by integrating a sufficiently large inductance into the short circuit path. This
could bea choke, for example, as is oftenused in theDC-bus.
Another variant of input rectifier, but without the possibility of returning energy into the
mains, is depicted in
The Vienna Rectifie
presented here only uses three
IGBTs and also provides the possibility of a high power factor.
TheViennaRectifier or three-level PWM rectifier was presented in 1994 by JohannW. Kolar and FranzC. Zach
from theTechnical University of Vienna.