module with copper bond wires and copper metallisation of
the chip surfaces
14.6 Lifetime calculation
The lifetime calculation takes a central role in the design of an application. Following is
an example of a given load cycle and a complete calculation for the lifetime of the
IGBTs of a power module (the calculation of the diodes would follow the same pattern).
TheTC andPC charts fro
ill be constituents of it.
Given is a load cycle with duration of 300s as depicted in
resulting from the
calculation of losses and the subsequent thermal calculation of the heatsink, baseplate
and junction temperature. Here, the module is operated periodically for 11s with a
current of 480A
, then for 10s with 425A
and for a further 2s with a current of
. Always with the intervals shown in
n which no load is applied. To
simplify the example, the following parameters are assumed to be constant during
IGBT switching frequency f
Fundamental frequency of theoutput current f
Power factor cos
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