Common mode/differential mode choke

An electromagnetic assembly having improved damping characteristics, the assembly for use with a power source including positive and a negative source busses and a load including positive and negative load buses, the assembly comprising:

• a first toroidal core of magnetic material having at least first and second core sections and forming a first surface;
• a fist winding encircling the first core section and linked between the positive source bus and the positive load bus;
• a second winding encircling the second core section and linked between the negative source bus and the negative load bus, the first and second windings wrapped about the core sections such that common mode currents traveling from the source to the load cause currents in the first core that travel in the same direction;
• and
• a second toroidal core forming a second surface and positioned relative to the first toroidal core and outside the windings such that the first and second surfaces oppose each other and form an air gap there between.