Integrated inductor and power module

An integrated inductor, comprising:

• a magnetic core, comprising:
• N winding columns being in parallel, where N is an integer greater than or equal to 3;
• a first cover plate disposed at a bottom of the multiple winding columns;
• a second cover plate disposed at a top of the multiple winding columns, and opposite to the first cover plate;
• and
• a common column connected between the first cover plate and the second cover plate, disposed on one side or both sides of the N winding columns, and extending from a position corresponding to the first winding column of the N winding columns to a position of the last winding column of the N winding columns;
• and
• N windings respectively wound on the N winding columns, and a current flowing through each of the N windings comprises a line frequency current component and a high-frequency current component, wherein the integrated inductor is applied in a switching power supply circuit comprising a switch, wherein the line frequency current component is an intrinsic current component of the switching power supply circuit according to a load, and the high-frequency current component is a ripple current component induced by operation of the switch, wherein the N windings are wound on the N winding columns in either a clockwise direction or a counterclockwise direction, and the line frequency current component of the current flowing through each of the N windings generates magnetic flux in a same direction within the N winding columns, a phase difference between the high-frequency current component of the current flowing through each of the N windings is 360°/N, the switching power supply circuit further comprises a control unit configured to control the operation of the switch, such that the high-frequency current component of the current flowing through each of the N windings is 360°/N, and the common column without air-gap configured to significantly decrease the magnetic reluctance of the common column, but each winding column is provided with an air gap configured to increase magnetic reluctance of the winding column, thereby reducing shared magnetic flux between every pair of the N windings such that a coupling coefficient between every pair of the N windings is less than 0.1.