# US 2018/0323008 A1 · Transformer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323008 A1 - Document ID: US20180323008A1 - Status: Published application - Kind: A1 - Application number: 15/876,424 - Filed: 2018-01-22 - Published: 2018-11-08 - Earliest claimed: 2017-05-08 - Assignees: Delta Electronics, Inc. - Applicants: Delta Electronics,Inc. - Inventors: Jianxing DONG; Jianping YING; Teng LIU - Web page: https://patentgrep.com/patent/US20180323008A1 ## CPC - H01F 27/34: Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields - H01F 27/24: Magnetic cores - H01F 27/2823: {Wires (H01F27/2866 takes precedence)} - H01F 30/16: Toroidal transformers - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A transformer includes a magnetic core, a first winding and at least one second winding. The magnetic core has a window through which the first winding passes through without contacting the magnetic core. The second winding passes through the window of the magnetic core and is wound on the magnetic core. The second winding has a distance from the first winding, and the second winding has a first insulating part disposed on an outer surface of the second winding facing the first winding. ## Claims ### Claim 1 A transformer comprising: a magnetic core having a window; a first winding passing through the window of the magnetic core without contacting the magnetic core; and at least one second winding passing through the window of the magnetic core, the second winding being wound on the magnetic core, wherein the second winding has a distance from the first winding, and the second winding has a first insulating part disposed on an outer surface of the second winding facing the first winding. ### Claim 2 (depends on 1) The transformer of claim 1, wherein the first insulating part is formed on the outer surface of the first winding by dipping or spraying. ### Claim 3 (depends on 1) The transformer of claim 1, wherein the first insulating part is a silicone rubber paint layer or a silicone gel layer. ### Claim 4 (depends on 1) The transformer of claim 1, wherein the first winding is a silicon wire. ### Claim 5 (depends on 1) The transformer of claim 1, wherein the second winding is a triple insulated wire. ### Claim 6 (depends on 1) The transformer of claim 1, wherein the magnetic core is in an annular shape. ### Claim 7 (depends on 6) The transformer of claim 6, wherein the first winding perpendicularly passes through a central position of the window of the magnetic core. ### Claim 8 (depends on 1) The transformer of claim 1, wherein the first insulating part is disposed between the second winding and the magnetic core. ### Claim 9 (depends on 1) The transformer of claim 1, further comprising: a bobbin having a first holding space and a second holding space therein, wherein the first winding is disposed within the first holding space, and the magnetic core and the second windings are disposed within the second holding space. ### Claim 10 (depends on 9) The transformer of claim 9, wherein the first winding further has an extending part, the extending part bends and extends from one end of the first winding and is fixed outer side of the bobbin. ### Claim 11 (depends on 1) The transformer of claim 1, wherein the second winding comprises a winding part having a first winding direction and a winding part having a second winding direction, and the first winding direction is opposite to the second winding direction. ### Claim 12 (depends on 1) The transformer of claim 1, wherein the second winding comprises a multi-turn coil, and the multi-turn coil is uniformly distributed on the magnetic core. ### Claim 13 (depends on 1) The transformer of claim 1, wherein an electrical potential of the magnetic core is floating. ### Claim 14 A transformer comprising: a magnetic core having a window; a first winding passing through the window of the magnetic core without contacting the magnetic core; and at least one second winding passing through the window of the magnetic core, the second winding being wound on the magnetic core, wherein the second winding has a distance from the first winding, and the first winding has a second insulating part disposed at least on an outer surface of the first winding facing the second winding. ### Claim 15 (depends on 14) The transformer of claim 14, wherein the second insulating part is formed on the outer surface of the second winding by dipping or spraying. ### Claim 16 (depends on 14) The transformer of claim 14, further comprising: a bobbin having a first holding space and a second holding space therein, wherein the first winding is disposed within the first holding space, and the magnetic core and the second windings are disposed within the second holding space. ### Claim 17 (depends on 16) The transformer of claim 16, wherein the first winding further has an extending part, the extending part bends and extends from one end of the first winding and is fixed outside of the bobbin. ### Claim 18 (depends on 14) The transformer of claim 14, wherein the second winding comprises a winding part having a first winding direction and a winding part having a second winding direction, and the first winding direction is opposite to the second winding direction. ### Claim 19 (depends on 14) The transformer of claim 14, wherein the second winding comprises a multi-turn coil, and the multi-turn coil is uniformly distributed on the magnetic core. ### Claim 20 (depends on 14) The transformer of claim 14, wherein an electrical potential of the magnetic core is floating.