# US 12,603,217 B2 · Inductor structure, circuit board and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,217 B2 - Document ID: US12603217B2 - Status: Granted - Kind: B2 - Application number: 18/684,443 - Filed: 2023-10-26 - Published: 2025-07-10 - Granted: 2026-04-14 - Earliest claimed: 2023-10-26 - Assignees: Hunan Huasun M&E Technology Co.Ltd - Applicants: Hunan Huasun M&E Technology Co.Ltd - Inventors: Xiaoying Yang; Fei Yang; Hong Fu; Dongsheng Liu; Sheng Yang; Jie Ling - Web page: https://patentgrep.com/patent/US12603217B2 ## CPC - H01F 27/24: Magnetic cores - H01F 27/292: {Surface mounted devices} - H01F 17/045: {with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core} - H01F 27/065: {Mounting on printed circuit boards} - H01F 27/2823: {Wires (H01F27/2866 takes precedence)} - H01F 27/2828: {Construction of conductive connections, of leads} - H01F 27/306: {Fastening or mounting coils or windings on core, casing or other support} - H01F 3/08: made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06) - H01F 2017/046: {helical coil made of flat wire, e.g. with smaller extension of wire cross section in the direction of the longitudinal axis} - H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder} - H05K 1/181: associated with surface mounted components - H05K 2201/1003: Non-printed inductor - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract The present application provides an inductor structure, a circuit board and an electronic device. The inductor structure includes a magnetic core column and a wire. The magnetic core column includes a first part, a second part and a third part arranged sequentially along a first direction, the first part has a first side wall facing away from the second part, and the third part has a second side wall facing away from the second part. The wire is wound around the magnetic core column and is configured to be electrically connected to the circuit board. ## Claims ### Claim 1 An inductor structure, comprising: a magnetic core column, comprising a first part, a second part and a third part arranged sequentially along a first direction, the first direction being perpendicular to a length direction of the magnetic core column; a wire, wound around the magnetic core column and configured to be electrically connected with a circuit board; wherein, the first part has a first side wall facing away from the second part, the third part has a second side wall facing away from the second part, and the first side wall and/or the second side wall is/are arranged in a curved shape; and the second part has a first cross-section perpendicular to the length direction of the magnetic core column, the first cross-section is rectangular; and a length and a width of the first cross-section meet a condition of: H/M∈(1.2, 1.8), wherein H is the length of the first cross-section, in mm; and M is the width of the first cross-section, in mm. ### Claim 2 (depends on 1) The inductor structure according to claim 1, wherein the length and width of the first cross-section meet conditions of: H∈(1.8, 2.7); and M∈(1, 2.2). ### Claim 3 (depends on 2) The inductor structure according to claim 2, wherein the first part has a second cross-section perpendicular to the length direction of the magnetic core column, the third part has a third cross-section perpendicular to the length direction of the magnetic core column, and the second cross-section and/or the third cross-section is/are semi-elliptical. ### Claim 4 An inductor structure, comprising: a magnetic core column, comprising a first part, a second part and a third part arranged sequentially along a first direction, the first direction being perpendicular to a length direction of the magnetic core column; a wire wound around the magnetic core column and-is configured to be electrically connected with the circuit board; wherein, the first part has a first side wall facing away from the second part, the third part has a second side wall facing away from the second part, and the first side wall and/or the second side wall is/are arranged in a curved shape; and the second part has a first cross-section perpendicular to the length direction of the magnetic core column, the first cross-section is rectangular; and a length and a width of the first cross-section meet a condition of: H/M∈(1.2, 1.8), wherein H is the length of the first cross-section, in mm; and M is the width of the first cross-section, in mm, the wire is a flat wire, the flat wire has a flat side, and the flat side is attached to the magnetic core column. ### Claim 5 (depends on 4) The inductor structure according to claim 4, wherein the major axis length and the minor axis length of the second cross-section meet conditions of: a1∈(0.9, 1.3) and b1∈(0.4, 0.8); and/or, the major axis length and the minor axis length of the third cross-section meet conditions of: a2∈(0.9, 1.3) and b2∈(0.4, 0.8). ### Claim 6 (depends on 4) The inductor structure according to claim 4, wherein in case that the length and the width of the first cross-section are 2.0 mm and 1.6 mm, respectively, then the major axis length and the minor axis length of the third cross-section are 0.94 mm and 0.66 mm, respectively, or the major axis length and the minor axis length of the third cross-section are 1.0 mm and 0.7 mm, respectively. ### Claim 7 (depends on 4) The inductor structure according to claim 4, wherein in case that the length and the width of the first cross-section are 2.0 mm and 1.6 mm, respectively, then the major axis length and the minor axis length of the second cross-section are 0.94 mm and 0.66 mm, respectively, or the major axis length and the minor axis length of the second cross-section are 1.0 mm and 0.7 mm, respectively. ### Claim 8 (depends on 1) The inductor structure according to claim 1, wherein the first part and the third part have a same structure, and are mutually symmetric in structure with respect to a center point of the second part. ### Claim 9 (depends on 8) The inductor structure according to claim 8, wherein the first part, the second part and the third part are integrally formed. ### Claim 10 (depends on 1) The inductor structure according to claim 1, wherein the inductor structure comprises a base, and the base has a first surface and a second surface that are opposite to each other; and wherein the magnetic core column is disposed on the first surface, the wire is disposed on the magnetic core column, and at least one end of the wire is extended to the second surface. ### Claim 11 (depends on 10) The inductor structure according to claim 10, wherein the wire has a first end and a second end arranged oppositely, and the first end and the second end (220) are both extended to the second surface (330) and are configured to be soldered on a circuit board. ### Claim 12 (depends on 11) The inductor structure according to claim 11, wherein the base has a plurality of sides connected to the first surface and the second surface, the first end and the second end are extended along a same side to the second surface, and the same side is any one of the plurality of sides. ### Claim 13 (depends on 1) The inductor structure according to claim 1, wherein the inductor structure further comprises a magnetic matrix, the magnetic matrix is filled and over-coated outside the magnetic core column and the wire; wherein, a magnetic permeability of the magnetic matrix is different from a magnetic permeability of the magnetic core column. ### Claim 14 (depends on 13) The inductor structure according to claim 13, wherein the magnetic permeability of the magnetic matrix is smaller than the magnetic permeability of the magnetic core column. ### Claim 15 (depends on 14) The inductor structure according to claim 14, wherein the magnetic permeability of the magnetic core column meets a condition of μ1∈[25, 45], and the magnetic permeability of the magnetic matrix meets a condition of μ2∈[15, 45]. ### Claim 16 (depends on 12) The inductor structure according to claim 12, wherein the magnetic matrix is coated with a coating, and a color space value in a Lab color mode of the coating is between (0, −10, −5) and (54, 0, 0). ### Claim 17 (depends on 1) A circuit board, comprising the inductor structure according to claim 1 and a circuit substrate, wherein the inductor structure is disposed on the circuit substrate. ### Claim 18 (depends on 17) An electronic device, comprising the circuit board according to claim 17. ### Claim 19 (depends on 1) The inductor structure according to claim 1, wherein a magnetic powder of the magnetic core column and/or a magnetic powder of the magnetic matrix is/are a Fe—Si—Cr—B composite system.