System and method for sinusoidal output and integrated EMC filtering in a motor drive

A motor drive, comprising:

• a DC bus having a positive rail and a negative rail, the DC bus operative to maintain a DC voltage between the positive and negative rails;
• a DC bus capacitance connected between the positive rail and the negative rail of the DC bus, wherein the DC bus capacitance includes:
• a first DC bus capacitor connected at a first terminal to the positive rail and connected at a second terminal to a common connection;
• and
• a second DC bus capacitor connected at a first terminal to the negative rail and connected at a second terminal to the common connection;
• an inverter section having an input configured to receive the DC voltage from the DC bus and an output configured to output an AC output voltage wherein the inverter section is operative to covert the DC voltage to the AC output voltage;
• an output configured to supply the AC output voltage to a motor operatively connected to the motor drive;
• and
• an output filter operatively connected between the output of the inverter section and the output of the motor drive, wherein the output filter is connected to the common connection and wherein common mode currents present in the motor drive circulate within the motor drive via the common connection between the output filter and the DC bus capacitance.