# US 2013/0154781 A1 · Windings and Formation Methods for Transformers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154781 A1 - Document ID: US20130154781A1 - Status: Published application - Kind: A1 - Application number: 13/633,303 - Filed: 2012-10-02 - Published: 2013-06-20 - Earliest claimed: 2011-12-14 - Assignees: Shamrock Micro Devices Corp. - Inventors: Chien-Chen Cho - Web page: https://patentgrep.com/patent/US20130154781A1 ## CPC - H01F 5/04: Arrangements of electric connections to coils, e.g. leads - H01F 41/064: Winding non-flat conductive wires, e.g. rods, cables or cords - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract Embodiments of the present invention pertain to windings and methods thereof. A disclosed winding is for an inductive device, having a winding core and a winding portion. The winding portion has a first winding layer, a connection section, and a second winding layer. The first winding layer comprises a first solenoid wound around the winding core along a step direction. The connection section is on the first winding layer, substantially in parallel to the step direction. The second winding layer comprises a second solenoid wound around the first winding layer along the step direction. The connection section electrically connects the first and second winding layers. ## Claims ### Claim 1 A winding for an inductive device, comprising: a winding core; and a winding portion, comprising: a first winding layer comprising a first solenoid wound around the winding core along a step direction; a connection section on the first winding layer, substantially parallel to the step direction; and a second winding layer comprising a second solenoid wound around the first winding layer along the step direction; wherein the connection section electrically connects the first and second winding layers. ### Claim 2 (depends on 1) The winding as claimed in claim 1, wherein the connection section is sandwiched by the first and second winding layers. ### Claim 3 (depends on 1) The winding as claimed in claim 1, wherein the first solenoid has an ending terminal and the second solenoid has a starting terminal, the connection section connects the ending terminal to the starting terminal, and the winding further comprises two fastening objects for fastening the starting and ending terminals. ### Claim 4 (depends on 3) The winding as claimed in claim 3, wherein the fastening objects are pieces of Mylar tape. ### Claim 5 (depends on 1) The winding as claimed in claim 1, wherein the connection section is a first connection section, and the winding portion further comprises: a second connection section on the second winding layer, substantially parallel to the step direction; and a third winding layer comprising a third solenoid wound around the second winding layer along the step direction; wherein the second connection section electrically connects the second and third winding layers. ### Claim 6 (depends on 5) The winding as claimed in claim 5, wherein the first and second connection sections are on substantially the same location at a circumference of the winding core. ### Claim 7 (depends on 5) The winding as claimed in claim 5, wherein the winding core is between the first and second connection sections. ### Claim 8 A method for forming a winding, comprising: providing a conductive wire; winding, along a step direction, the conductive wire around a winding core to form a first solenoid; extending the conductive wire along a direction parallel to the step direction to form a connection section on the first solenoid; and winding, along the step direction, the conductive wire around the first solenoid and the connection section to form a second solenoid. ### Claim 9 (depends on 8) The method as claimed in claim 8, further comprising: substantially fastening an ending terminal of the first solenoid; and forming the connection section starting from the ending terminal. ### Claim 10 (depends on 8) The method as claimed in claim 8, further comprising: fastening the conductive wire to form a starting terminal of the second solenoid; and winding the conductive wire around the first solenoid and the connection section to form the second solenoid. ### Claim 11 (depends on 8) The method as claimed in claim 8, wherein the connection section is a first connection section, the method comprising: extending the conductive wire along a direction parallel to the step direction to form a second connection section on the second solenoid; and winding, along the step direction, the conductive wire around the second solenoid and the second connection section to form a third solenoid. ### Claim 12 (depends on 11) The method as claimed in claim 11, wherein the first and second connection sections are on substantially the same location at a circumference of the winding core. ### Claim 13 (depends on 11) The method as claimed in claim 11, wherein the winding core is between the first and second connection sections. ### Claim 14 A transformer, comprising: a winding core; a primary winding, comprising: a first winding layer comprising a first solenoid wound around the winding core along a step direction; a connection section on the first winding layer, substantially parallel to the step direction; and a second winding layer comprising a second solenoid wound around the first winding layer and the connection section along the step direction; and a secondary winding, comprising a secondary solenoid wound around the second solenoid. ### Claim 15 (depends on 15) The transformer as claimed in claim 15, wherein primary winding further has a third solenoid wound around the secondary solenoid along the step direction.