# US 11,909,310 B2 · Switching power supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,310 B2 - Document ID: US11909310B2 - Status: Granted - Kind: B2 - Application number: 17/125,729 - Filed: 2020-12-17 - Published: 2021-04-08 - Granted: 2024-02-20 - Earliest claimed: 2018-08-17 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Tatsuya Hosotani - Web page: https://patentgrep.com/patent/US11909310B2 ## CPC - H02M 3/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H01F 17/0006: {Printed inductances (printed coils for dynamo-electric machines H02K3/26; printed circuits H05K)} - H02M 3/1584: {with a plurality of power processing stages connected in parallel} - H01F 2017/0066: {with a magnetic layer} - H01F 2017/0073: {with a special conductive pattern, e.g. flat spiral} - H02M 3/1586: {switched with a phase shift, i.e. interleaved} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A switching power supply device includes a power conversion circuit that is provided at a multilayer printed board and includes a plurality of switching circuits and a controller controlling the switching circuits, windings configuring an inductor at the multilayer printed board, and a magnetic sheet on one or both of upper and lower faces of the multilayer printed board. First ends of the windings are connected to the switching circuits, and second ends of the windings are connected to a common output. The controller controls the plurality of switching circuits to periodically vary a position and a time at which magnetic flux generated by current flowing to the windings reaches the maximum magnetic flux density. Thus, the switching power supply device is thin, achieves dispersion of heat generation, handles variations in the magnitude of electric power by varying the area of the board, and effectively reduces unwanted radiation. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The switching power supply device according to claim 1, wherein the magnetic sheet is made of soft ferrite. ### Claim 3 (depends on 2) The switching power supply device according to claim 2, wherein the magnetic sheet is made of an Ni—Zn—Cu sintered ferrite material with a maximum relative permeability at a frequency of 10 MHz or more. ### Claim 4 (depends on 3) The switching power supply device according to claim 3, wherein a thickness of the magnetic sheet is smaller than a thickness of the multilayer printed board. ### Claim 5 (depends on 3) The switching power supply device according to claim 3, wherein the magnetic sheet comprehensively covers the plurality of windings. ### Claim 6 (depends on 3) The switching power supply device according to claim 3, wherein the plurality of windings are separate windings, each of the plurality of windings includes a winding opening, and the plurality of windings are arranged at positions such that winding openings of adjacent windings do not overlap. ### Claim 7 (depends on 3) The switching power supply device according to claim 3, wherein the plurality of windings are connected to the switching circuits such that operation of the switching circuits causes currents in regions of the adjacent winding parts that extend in parallel to each other to flow in a same direction. ### Claim 8 (depends on 2) The switching power supply device according to claim 2, wherein a thickness of the magnetic sheet is smaller than a thickness of the multilayer printed board. ### Claim 9 (depends on 2) The switching power supply device according to claim 2, wherein the magnetic sheet comprehensively covers the plurality of windings. ### Claim 10 (depends on 2) The switching power supply device according to claim 2, wherein the plurality of windings are separate windings, each of the plurality of windings includes a winding opening, and the plurality of windings are arranged at positions such that winding openings of adjacent windings do not overlap. ### Claim 11 (depends on 2) The switching power supply device according to claim 2, wherein the plurality of windings are connected to the switching circuits such that operation of the switching circuits causes currents in regions of the adjacent winding parts that extend in parallel to each other to flow in a same direction. ### Claim 12 (depends on 2) The switching power supply device according to claim 2, wherein using a build-up method for forming a plurality of base material layers, the plurality of windings are formed at the multilayer printed board by electrically connecting the conductor patterns formed at the plurality of base material layers. ### Claim 13 (depends on 1) The switching power supply device according to claim 1, wherein a thickness of the magnetic sheet is smaller than a thickness of the multilayer printed board. ### Claim 14 (depends on 13) The switching power supply device according to claim 13, wherein the magnetic sheet comprehensively covers the plurality of windings. ### Claim 15 (depends on 1) The switching power supply device according to claim 1, wherein the magnetic sheet comprehensively covers the plurality of windings. ### Claim 16 (depends on 15) The switching power supply device according to claim 15, wherein the magnetic sheet includes a slit-shaped non-magnetic part that is absent the magnetic body, the non-magnetic part being configured in a part between adjacent windings among the plurality of windings. ### Claim 17 (depends on 1) The switching power supply device according to claim 1, wherein the plurality of windings are separate windings, each of the plurality of windings includes a winding opening, and the plurality of windings are arranged at positions such that winding openings of adjacent windings do not overlap. ### Claim 18 (depends on 1) The switching power supply device according to claim 1, wherein the plurality of windings are connected to the switching circuits such that operation of the switching circuits causes currents in regions of the adjacent winding parts that extend in parallel to each other to flow in a same direction. ### Claim 19 (depends on 1) The switching power supply device according to claim 1, wherein using a build-up method for forming a plurality of base material layers, the plurality of windings are formed at the multilayer printed board by electrically connecting the conductor patterns formed at the plurality of base material layers. ### Claim 20 (depends on 19) The switching power supply device according to claim 19, wherein of the plurality of base material layers configuring the multilayer printed board, the conductor patterns configuring the plurality of windings at an intermediate layer sandwiched between a bottom layer and a front layer include conductor patterns of two types, and the conductor patterns of two types are arranged alternately in a lamination direction. ### Claim 21 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, and the magnetic sheet is made of soft ferrite and an Ni—Zn—Cu sintered ferrite material with a maximum relative permeability at a frequency of 10 MHz or more. ### Claim 22 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, using a build-up method for forming a plurality of base material layers, the plurality of windings are formed at the multilayer printed board by electrically connecting the conductor patterns formed at the plurality of base material layers, and of the plurality of base material layers configuring the multilayer printed board, the conductor patterns configuring the plurality of windings at an intermediate layer sandwiched between a bottom layer and a front layer include conductor patterns of two types, and the conductor patterns of two types are arranged alternately in a lamination direction.