Research on an Inverter Output Filter for Reducing Common-Mode Voltage at Motor Terminals in PWM Drive System

Comparison of different inverter architectures and controls in terms of conducted EMI

“…In [3], the authors explain how to suppress common mode voltage (thus filtering common mode currents) with a simple 4 th leg addition linked with a LC passive output filter. Another work [4] proposes a push-pull amplifier linked with a four windings transformer, able to compensate output common mode voltage. These solutions are very simple but their efficiencies are only convenient below 100 kHz.…”