Patent ID: 11909310
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A switching power supply device comprising:
a power conversion circuit that is provided at a multilayer printed board and includes a plurality of switching circuits and a controller configured to control the plurality of switching circuits;
a plurality of windings that are at the multilayer printed board, each of the plurality of windings configuring an inductor having a first end and a second end; and
a magnetic sheet that is provided on one or both of an upper face of the multilayer printed board and a lower face of the multilayer printed board, the magnetic sheet being made of a soft magnetic body configuring a magnetic layer,
wherein
the plurality of windings have conductor patterns at the multilayer printed board,
the plurality of windings are arranged along a plane of the multilayer printed board,
the first ends of the plurality of windings are connected to the plurality of switching circuits, and the second ends of the plurality of windings are connected to a common output,
the controller is configured to control the plurality of switching circuits to periodically vary a position and a time at which magnetic flux generated by current flowing to the plurality of windings reaches maximum magnetic flux density,
the plurality of windings each include two winding parts in which currents flow in opposite rotation directions, and
the plurality of windings are arranged such that one winding parts of the two winding parts are adjacent to each other.