US 12,451,278 B2
Integrated inductor and power module
Zengyi Lu, Shanghai (CN); and Tianding Hong, Shanghai (CN)
Assigned to Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Dec. 7, 2021, as Appl. No. 17/457,919.
Claims priority of application No. 202011546141.5 (CN), filed on Dec. 24, 2020.
Prior Publication US 2022/0208425 A1, Jun. 30, 2022
Int. Cl. H01F 27/24 (2006.01); H01F 3/14 (2006.01); H01F 38/02 (2006.01); H02M 1/42 (2007.01)
CPC H01F 3/14 (2013.01) [H01F 27/24 (2013.01); H01F 38/023 (2013.01); H02M 1/4225 (2013.01); H01F 2038/026 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An integrated inductor, comprising:
a magnetic core, comprising:
two winding columns being in parallel;
a first cover plate disposed at a bottom of the two winding columns;
a second cover plate disposed at a top of the two winding columns, and opposite to the first cover plate; and
a common column connected between the first cover plate and the second cover plate, and disposed on one side or both sides of the two winding columns; and
two windings respectively wound on the two winding columns, and a current flowing through each of the two 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 two windings are wound on the two 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 two windings generates magnetic flux in a same direction within the two winding columns, a phase difference between the high-frequency current component of the current flowing through each of the two windings is 180°, 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 two windings is 180°, 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 the shared magnetic flux between the two windings such that a coupling coefficient between the two windings is less than 0.1.