# US 2021/0280366 A1 · Transformer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0280366 A1 - Document ID: US20210280366A1 - Status: Published application - Kind: A1 - Application number: 17/253,191 - Filed: 2019-06-14 - Published: 2021-09-09 - Earliest claimed: 2018-06-22 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Soo Kwang YOON; Yu Seon KIM; Seok BAE; Jung Ki LEE - Web page: https://patentgrep.com/patent/US20210280366A1 ## CPC - H01F 27/325: {Coil bobbins (formers for coils in general H01F5/02)} - H01F 5/02: wound on non-magnetic supports, e.g. formers - H01F 27/2852: {Construction of conductive connections, of leads} - H01F 27/2866: {Combination of wires and sheets} - H01F 27/29: Terminals; Tapping arrangements {for signal inductances} - H01F 27/306: {Fastening or mounting coils or windings on core, casing or other support} - H01F 27/2876: {Cooling (cooling transformers and inductances in general H01F27/08)} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract The present invention pertains to a transformer, and more specifically, to a transformer which includes a primary coil unit comprising wound conductive lines, and a secondary coil unit in which conductive plates are stacked. The transformer according to an embodiment of the present invention may include: a bobbin; a core unit which is coupled to the bobbin along the outer side of the bobbin; and a plurality of conductive plates which are inserted into the bobbin and stacked in the thickness direction. ## Claims ### Claim 1 A transformer, comprising: a bobbin; a core part disposed outside the bobbin to expose a portion of the bobbin; and a plurality of conductive plates inserted into the bobbin, the plurality of conductive plates being stacked in a thickness direction, wherein the bobbin has therein openings to respectively expose, among the plurality of conductive plates, a portion of an upper surface of a conductive plate located at an uppermost position in the thickness direction and a portion of a lower surface of a conductive plate located at a lowermost position in the thickness direction. ### Claim 2 A transformer, comprising: a bobbin; a core part disposed outside the bobbin to expose a portion of the bobbin; and a plurality of conductive plates inserted into the bobbin, the plurality of conductive plates constituting an upper coil part, a middle coil part, and a lower coil part, wherein the bobbin comprises: a lower receiving part receiving the lower coil part; a middle receiving part disposed on the lower receiving part to receive the middle coil part; and an upper receiving part disposed on the middle receiving part to receive the upper coil part, wherein the upper receiving part comprises a first protruding portion covering at least a portion of an upper surface of an uppermost conductive plate of the upper coil part, and wherein the lower receiving part comprises a second protruding portion covering at least a portion of a lower surface of a lowermost conductive plate of the lower coil part. ### Claim 3 (depends on 2) The transformer according to claim 2, wherein the bobbin further comprises: an upper connection part connecting the upper receiving part and the middle receiving part; and a lower connection part connecting the middle receiving part and the lower receiving part. ### Claim 4 (depends on 3) The transformer according to claim 3, wherein the upper receiving part comprises: a bottom portion that is in contact with the upper connection part; a middle portion forming a sidewall of the upper receiving part and extending upwards from at least a region of an edge of an upper surface of the bottom portion; and a top portion disposed along an upper surface of the middle portion. ### Claim 5 (depends on 4) The transformer according to claim 4, wherein the first protruding portion protrudes from the top portion. ### Claim 6 (depends on 4) The transformer according to claim 4, wherein outer side surfaces of the bottom portion, the middle portion and the top portion are aligned in a thickness direction. ### Claim 7 (depends on 4) The transformer according to claim 4, wherein an upper surface of the top portion protrudes further inwards than a lower surface thereof that is in contact with the middle portion when viewed in plan. ### Claim 8 (depends on 7) The transformer according to claim 7, wherein an inner side surface of the top portion is formed at an incline. ### Claim 9 (depends on 7) The transformer according to claim 7, wherein an inner side surface of the top portion and an inner side surface of the middle portion form an obtuse angle therebetween. ### Claim 10 (depends on 8) The transformer according to claim 8, wherein an edge of at least a portion of an upper surface of an uppermost conductive plate of the upper coil part is in contact with the inner side surface of the top portion that is formed at an incline. ### Claim 11 (depends on 1) The transformer according to claim 1, wherein each of the plurality of conductive plates comprises: a coil portion corresponding to a winding of a secondary coil; and a first connection portion and a second connection portion respectively extending from both ends of the coil portion in one direction, wherein the one direction has a predetermined inclination with respect to a long-axis direction of the core part when viewed in plan. ### Claim 12 (depends on 11) The transformer according to claim 11, wherein each of the plurality of conductive plates comprises: a first boundary portion between an outer side of one end of the coil portion and the first connection portion; a second boundary portion between an inner side of the one end and the first connection portion; a third boundary portion between an inner side of another end of the coil portion and the second connection portion; and a fourth boundary portion between an outer side of the other end and the second connection portion. ### Claim 13 (depends on 12) The transformer according to claim 12, wherein a curvature of any one boundary portion among the first boundary portion to the fourth boundary portion is greater than curvatures of three remaining boundary portions. ### Claim 14 (depends on 13) The transformer according to claim 13, wherein the first connection portion is connected to a ground terminal, wherein the second connection portion is connected to a signal terminal, and wherein the any one boundary portion having a curvature greater than curvatures of the three remaining boundary portions is the fourth boundary portion. ### Claim 15 (depends on 11) The transformer according to claim 11, wherein the plurality of conductive plates comprises: a plurality of first type of conductive plates; and a plurality of second type of conductive plates having a planar shape that is bilaterally symmetrical with a planar shape of the first type of conductive plates, and wherein the plurality of first type of conductive plates and the plurality of second type of conductive plates are alternately disposed. ### Claim 16 (depends on 11) The transformer according to claim 11, wherein the predetermined inclination is less than 87 degrees. ### Claim 17 (depends on 1) The transformer according to claim 1, wherein each of the plurality of conductive plates comprises: a coil portion corresponding to a winding of a secondary coil, the coil portion having an open annular planar shape; a first connection portion extending from one end of the coil portion in a first direction; and a second connection portion extending from another end of the coil portion in a second direction different from the first direction, and wherein the first direction and the second direction form a predetermined angle therebetween when viewed in plan. ### Claim 18 (depends on 17) The transformer according to claim 17, wherein the predetermined angle is between 3 degrees and 90 degrees. ### Claim 19 (depends on 17) The transformer according to claim 17, wherein the first direction corresponds to a direction in which the plurality of conductive plates is inserted into the bobbin.