Optimization Methods for Common Mode Cancellation in Phase Shifted Inverter Operation

Synchronized switching of two opposing semiconductors in a six-phase inverter setup can reduce the common mode spectrum. In a first prototypical setup, attenuations of up to 40 dB can be achieved up to the frequency range of the medium wave (500 kHz - 2 MHz). For an improved cancellation of the disturbances, a synchronization of switching edges is suggested in this contribution. Two methods are investigated, one in the time domain and the other in the frequency domain. Additionally, cancellation performance improvements with the help of skipped switching processes while zero crossing are introduced and evaluated.