Fully integrated inversely weakly coupled power inductor

An inductor coil winding comprising:

• a first terminal;
• a series of first circular turns in a vertically stacked relation, the series of first circular turns leading in from the first terminal and having a diameter allowing for an opening within the series of first circular turns;
• a series of elongated turns in a vertically stacked relation, the series of elongated turns leading in from the series of first circular turns and having a length greater than the diameter of the series of circular turns, and allowing for an opening within the series of elongated turns;
• a series of second circular turns in a vertical stacked relation, the series of second circular turns leading in from the series of elongated turns and having a diameter allowing for an opening within the series of second circular turns, the openings of the first and second circular turns being aligned with one another;
• and
• a second terminal, the second terminal leading out form the series of second circular turns.

A method of assembling a filter assembly, the method comprising:

• interleaving a first inductor coil winding with a second inductor coil winding, each of the first and second inductor coil windings including
• a first terminal,
• a series of first circular turns in a vertically stacked relation, the series of first circular turns leading in from the first terminal and having a diameter allowing for an opening within the series of first circular turns,
• a series of elongated turns in a vertically stacked relation, the series of elongated turns leading in from the series of first circular turns and having a length greater than the diameter of the series of circular turns, and allowing for an opening within the series of elongated turns,
• a series of second circular turns in a vertical stacked relation, the series of second circular turns leading in from the series of elongated turns and having a diameter for allowing an opening within the series of second circular turns, the openings of the first and second circular turns being aligned with one another, and
• a second terminal, the second terminal leading out form the series of second circular turns;
• positioning a first self-inductance core in first and second openings of the first inductor coil winding;
• positioning a second self-inductance core in the first and second openings of the second inductor coil winding;
• and
• positioning a coupled inductor core in the opening within the series of elongated turns.

A filter assembly comprising:

• a first self-inductance core;
• a second self-inductance core;
• a coupled inductor core;
• a first inductor coil winding having a series of first turns in a vertically stacked relation around the first self-inductance core and a series of second turns in a vertically stacked relation around the first self-inductance core and the coupled inductor core, the first inductor coil winding being wound in a first direction;
• a second inductor coil winding having a series of first turns in a vertically stacked relation around the second self-inductance core and a series of second turns in a vertically stacked relation around the second self-inductance core and the coupled inductor core, the second inductor coil winding being wound in a second direction, which is opposite the first direction;
• and
• a third inductor coil winding having a series of first turns in a vertically stacked relation around the first self-inductance core and a series of second turns in a vertically stacked relation around the first self-inductance core and the coupled inductor core, the third inductor coil winding being wound in a first direction,
• wherein the second inductor coil is positioned between the first inductor coil and the third inductor coil.