IGBT Modules - Technologies, Driver and Application (Second Edition) - page 359

the way the gate is controlled. The disadvantages of this variation are its
complex design and the fact that it is not possible to use standard driver
stages. A simplified
control can be achieved by a capacitor connected
between the collector and the gate. Still, the logic must respond very quickly,
and this is a further challenge for thegatedrive.
Fig. 8.20
Measures of balancing IGBTs connected in series
Usually, none of the processes described above are used alone, but in combinationwith
othermethods, suchas balancing resistors, snubbers andActiveClamping.
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