In many applications inverter fed electrical machines are used. In this paper the switching losses of an inverter with a B6 power stage built of IGBTs and freewheeling diodes are calculated.

First the power loss models for the IGBTs and the freewheeling diodes are defined. Then the switching times are determined by mathematically describing the space vector modulation scheme.

In part one the losses are calculated for one operating point to get the reader familiar with the calculation scheme.

in part two the formulation is more generic to perform the following calculations for a field of operating points. The surfaces of the losses are displayed depending on several input variables influencing the losses of the B6 power stage.