Radio frequency interference suppression circuit

A radio frequency interference (RFI) suppression circuit comprising:

• a reference ground end;
• a main power circuit comprising at least one first switch that comprises a control end, a first end and a second end, wherein a minimal impedance is presented between the second end and the reference ground end;
• a driving circuit electrically coupled to the control end and the second end;
• and
• at least one first impedance unit disposed between the second end and the reference ground end to increase an impedance value in a high frequency differential mode loop to reduce a high frequency voltage drop in the high frequency differential return path;
• wherein the first switch receives a driving signal from the driving circuit at the control end to be turned on or turned off between the first and the second ends accordingly to make the main power circuit converts a first power signal to a second power signal.