Simulation of resonant switching featuring a series connected resonant
network in the loadpath
The voltage overshoot during the passive turn-on in the example o
25V and decays after approximately 1µs with the voltage dropping to its nominal value.
The negative voltage peak is caused by the
slope of the collector current, in
connection with the stray inductances. At this point of time IGBT T
has been turned off
and the current of around 70A commutates to the diodeD
Aside from the resonant topologies there are quasi-resonant topologies. Load relief
networks, as described in chapte
are used here in order to reduce the switching
losseswhen turningon and off.