# US 2017/0287616 A1 · Magnetic element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0287616 A1 - Document ID: US20170287616A1 - Status: Published application - Kind: A1 - Application number: 15/464,263 - Filed: 2017-03-20 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Fsp Technology Inc. - Applicants: Fsp Technology Inc. - Inventors: Kuo-Fan Lin; Fu-Kai Tu - Web page: https://patentgrep.com/patent/US20170287616A1 ## CPC - H01F 27/2847: {Sheets; Strips (H01F27/2866 takes precedence)} - H01F 3/14: Constrictions; Gaps, e.g. air-gaps (in magnetic shunt paths H01F3/12) - H01F 27/263: {Fastening parts of the core together} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A magnetic element of the present invention includes a magnetic core member and a winding. The magnetic core member includes a central post, at least one lateral post and a winding space, and the winding is disposed in the winding space and around the central post. The central post includes a plurality of central air gaps, and the at least one lateral post includes a plurality of lateral air gaps. ## Claims ### Claim 1 A magnetic element, comprising: a magnetic core member comprising a central post, at least one lateral post and a winding space; and a winding disposed in the winding space and around the central post, wherein the central post comprises a plurality of central air gaps, and the at least one lateral post comprises a plurality of lateral air gaps. ### Claim 2 (depends on 1) The magnetic element according to claim 1, wherein the magnetic core member comprises a first magnetic core and a second magnetic core, the first magnetic core comprises a first central post and at least one first lateral post, and the second magnetic core comprises a second central post corresponding to the first central post and at least one second lateral post corresponding to the at least one first lateral post, wherein the first magnetic core is coupled to the second magnetic core to form the winding space, the central post comprises the first central post and the second central post, and the at least one lateral post comprises the at least one first lateral post and the at least one second lateral post, the central air gaps comprise a first air gap formed in the first central post and a third air gap formed in the second central post, and the lateral air gaps comprise a second air gap formed in the first lateral post and a fourth air gap formed in the second lateral post. ### Claim 3 (depends on 2) The magnetic element according to claim 2, wherein an adhesive is filled and sintered in the first air gap, the second air gap, the third air gap and the fourth air gap, and the adhesive is a Bond-Ply material. ### Claim 4 (depends on 2) The magnetic element according to claim 2, wherein a position of the first air gap corresponds to a position of the second air gap, and a position of the third air gap corresponds to a position of the fourth air gap. ### Claim 5 (depends on 2) The magnetic element according to claim 2, wherein a cross sectional area of the first lateral post is half of a cross sectional area of the first central post, and a cross sectional area of the second lateral post is half of a cross sectional area of the second central post. ### Claim 6 (depends on 5) The magnetic element according to claim 5, wherein the first magnetic core comprises two of the first lateral posts, the second magnetic core comprises two of the second lateral posts, and the first magnetic core and the second magnetic core form a first magnetic path comprising the first air gap, two of the second air gaps, two of the fourth air gaps, and the third air gap. ### Claim 7 (depends on 6) The magnetic element according to claim 6, wherein an equivalent air gap of the first magnetic path is equivalent to four of the serially arranged central air gaps. ### Claim 8 (depends on 2) The magnetic element according to claim 2, wherein a fifth air gap is formed between the first central post of the first magnetic core and the second central post of the second magnetic core, and a sixth air gap is formed between the first lateral post of the first magnetic core and the second lateral post of the second magnetic core. ### Claim 9 (depends on 8) The magnetic element according to claim 8, wherein the first magnetic core comprises two of the first lateral posts, the second magnetic core comprises two of the second lateral posts, and the first magnetic core and the second magnetic core form a second magnetic path comprising the first air gap, two of the second air gaps, two of the sixth air gaps, two of the fourth air gaps, the third air gap and the fifth air gap, and the second magnetic path has an equivalent air gap equivalent to six of the serially arranged central air gaps. ### Claim 10 (depends on 8) The magnetic element according to claim 8, wherein an adhesive is filled and sintered in the first air gap, the second air gaps, the third air gap, the fourth air gaps, the fifth air gap and the sixth air gaps, and the adhesive is a Bond-Ply material. ### Claim 11 (depends on 1) The magnetic element according to claim 1, further comprising an isolating member externally spaced from the lateral post for a predetermined distance. ### Claim 12 (depends on 11) The magnetic element according to claim 11, wherein the isolating member is made of magneto-conductive materials. ### Claim 13 (depends on 11) The magnetic element according to claim 11, wherein the isolating member covers the lateral air gap completely. ### Claim 14 (depends on 1) The magnetic element according to claim 1, wherein the winding comprises coils winded by electro-conductive flat wires. ### Claim 15 (depends on 1) The magnetic element according to claim 1, wherein the magnetic element is applied to a transformer of a fly back converter, an output inductance element of a forward converter or an inductance element of a power factor correction circuit of a power supply. ### Claim 16 A magnetic element, comprising: a magnetic core member comprising a central post, at least one lateral post and a winding space; a winding disposed in the winding space and around the central post; and at least one isolating member externally spaced from the at least one lateral post for a predetermined distance, wherein a plurality of air gaps are formed in the lateral post. ### Claim 17 (depends on 16) The magnetic element according to claim 16, wherein the isolating member is made of magneto-conductive materials. ### Claim 18 (depends on 16) The magnetic element according to claim 16, wherein the winding is directly positioned on the central post. ### Claim 19 (depends on 16) The magnetic element according to claim 16, wherein an adhesive is filled and sintered in the air gaps, and the adhesive is a Bond-Ply material. ### Claim 20 (depends on 16) The magnetic element according to claim 16, wherein the winding comprises coils winded by electro-conductive flat wires. ### Claim 21 (depends on 16) The magnetic element according to claim 16, wherein the isolating member covers the air gaps completely. ### Claim 22 (depends on 16) The magnetic element according to claim 16, wherein the magnetic core member comprises a first magnetic core and a second magnetic core, the first magnetic core comprises a first central post and at least one first lateral post, and the second magnetic core comprises a second central post corresponding to the first central post and at least one second lateral post corresponding to the at least one first lateral post, wherein the first magnetic core is coupled to the second magnetic core to form the winding space, the central post comprises the first central post and the second central post, and the at least one lateral post comprises the at least one first lateral post and the at least one second lateral post, the first lateral post comprises a seventh air gap and the second lateral post comprises an eighth air gap. ### Claim 23 (depends on 22) The magnetic element according to claim 22, wherein a ninth air gap is formed between the first lateral post and the second lateral post. ### Claim 24 (depends on 16) The magnetic element according to claim 16, wherein the magnetic element is applied to a transformer of a fly back converter, an output inductance element of a forward converter or an inductance element of a power factor correction circuit of a power supply.