EP3382724B1 - Transformer device - Google Patents

Transformer device Download PDF

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Publication number
EP3382724B1
EP3382724B1 EP18162449.5A EP18162449A EP3382724B1 EP 3382724 B1 EP3382724 B1 EP 3382724B1 EP 18162449 A EP18162449 A EP 18162449A EP 3382724 B1 EP3382724 B1 EP 3382724B1
Authority
EP
European Patent Office
Prior art keywords
coil
wire
core
layer insulated
twisted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18162449.5A
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German (de)
English (en)
French (fr)
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EP3382724A1 (en
Inventor
Masateru Hashimoto
Eiji Koide
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumida Corp
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Sumida Corp
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Publication date
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Publication of EP3382724A1 publication Critical patent/EP3382724A1/en
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Publication of EP3382724B1 publication Critical patent/EP3382724B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2895—Windings disposed upon ring cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers

Definitions

  • the present invention relates to a transformer device to be mounted in a LAN for networking, and more specifically, to a transformer device formed by winding a wire for a primary coil and a wire for a secondary coil around an annular core such as a toroidal core.
  • a technology in which a transformer device is formed, upon winding a wire for a primary coil and a wire for a secondary coil around a toric core such as a toroidal core, by winding a bifilar coil 211 formed by adjoining a primary coil 211A and a secondary coil 211B therearound (see FIG. 15 ) to reduce leakage flux .
  • a three-layer insulated wire is used as a wire for a bifilar wound coil.
  • Such a three-layer insulated wire has a high withstand voltage, and when the wire is used, the wire for the primary coil and the wire for the secondary coil can also be wound around the core by allowing both into close contact with each other even without interposing a separate insulating tape or the like between the wire for the primary coil and the wire for the secondary coil.
  • JP H7-029755 A discloses a common mode choke coil comprising two wires bifilarly wound around an annular core.
  • One of the wires is three-layer insulated, the other wire might be one-layer insulated.
  • WP 2010/045578 A1 , US 4,063,109 and JP 4-328812 disclose a transformer device with a wire for a primary coil and a wire for a secondary coil being twisted together and wound around an annular core.
  • the use when a three-layer insulated wire is used as the wire, while the use has an advantage of capability of increasing a withstand voltage, the use may cause a problem of excessive increase of a cost to be over the range which can be allowed by a user in a cost aspect.
  • the best coil is not necessarily required in terms of characteristics, and the coil is required to satisfy characteristics according to an application and a purpose thereof and to be formed into a balanced configuration in such a manner that the coil falls within a predetermined range according to the application and the purpose also in terms of cost.
  • the present invention has been made in view of the circumstances described above, and an object of the present invention is to provide a transformer device in which two wires for coils can be efficiently processed into the same winding state and a configuration in which various characteristics and a cost thereof fall within a predetermined range is formed.
  • a transformer device has the features of present claim 1.
  • the present invention provides atransformer device according to claim 1.
  • a wire for a primary coil and a wire for a secondary coil are wound around an annular core to allow a signal component to pass from the wire for the primary coil to the wire for the secondary coil, wherein the primary coil wire is formed of a one-layer insulated wire, and the secondary coil wire is formed of a three-layer insulated wire, respectively, and a twisted coil formed by intertwisting the two insulated wires is wound around the core.
  • the twisted coil is split into a first split coil to be wound around a part on one side of the core and a second split coil to be wound around a part on the other side of the core, and the one-layer insulated wires of the first and second split coils are electrically connected to first terminal pins on the one side of the core and the three-layer insulated wires of the first and second split coils are electrically connected to second terminal pins on the other side of the core.
  • the annular core is preferably formed into a toroidal core.
  • the annular core may be processed into a material in which a closed magnetic path is formed by combining a pair of U-shaped cores or a pair of E-shaped cores.
  • a twisting pitch of the twisted wire between the one-layer insulated wire and the three-layer insulated wire is preferably adjusted to 3 mm or more and 10 mm or less.
  • a wire diameter of each of the conducting wire of the one-layer insulated wire and the three-layer insulated wire which constitute the twisted wire is further preferably adjusted to 0.2 mm or more and 0.45 mm or less.
  • a total thickness of a coating member of the one-layer insulated wire and a coating member of the three-layer insulated wire interposed between individual conducting wires of the wire material for the primary coil and the wire material for the secondary coil is preferably adjusted to 0.1155 mm or more and 0.1430 mm or less.
  • wires can be formed into a closer contact state with each other in comparison with a case where coils are wound therearound by bifilar winding, and characteristics can be improved such that impedance can be adjusted to a stabilized value in a high-frequency band. Moreover, workability during winding the wire material for the coil around the core is also improved.
  • a certain degree of withstand voltage can be secured to maintain the characteristics, and simultaneously a significant rise of a production cost can be suppressed.
  • FIG. 1 is a schematic view showing a configuration of a transformer device according to the present embodiment
  • FIG. 2 shows a twisted coil 11 related to FIG. 1 in a state before winding a wire around a core 31.
  • the twisted coil 11 is formed of a twisted wire formed by intertwisting, into a spiral form, a one-layer insulated wire (for example, a polyurethane enameled wire (such as UEW) , ordinarily also referred to as an insulated wire) 11A formed of performing one-layer insulation coating on a conducting wire by a copper material or the like, and a three-layer insulated wire (such as TEX and TIW) 11B formed by performing three-layer insulation coating on the conducting wire of the copper material or the like.
  • a one-layer insulated wire for example, a polyurethane enameled wire (such as UEW) , ordinarily also referred to as an insulated wire
  • a three-layer insulated wire such as TEX and TIW
  • the twisted coil 11 is configured in such a manner that individual insulated wires 11A and 11B are intertwisted into the spiral form.
  • the individual insulated wires 11A and 11B can be uniformly crossed with magnetic flux.
  • two insulated wires 11A and 11B can be processed into almost the same winding state relative to the core 31 in a closer contact state to reduce magnetic leakage flux, and simultaneously impedance in a high-frequency band can be adjusted to a stabilized value.
  • the twisted coil 11 is wound around the annular core 31 at a substantially uniform pitch in a state of a twisted wire in which two kinds of insulated wires are intertwisted.
  • a material ordinarily referred to as a toroidal core (including not only a circular shape, but also an elliptical shape, a barrel shape, a rectangular shape or the like in an annular cross section) is preferably used, but is not necessarily limited to the toroidal core.
  • the core may be a material in which a closed magnetic path is formed by butting a pair of U-shaped cores or a pair of E-shaped cores with each other.
  • the shape is not limited to a toric shape, and may be formed into a polygonal annular shape.
  • a main material of the core include ferrite, permalloy, a silicon steel plate and the like, and a magnetic material other than the material described above can also be used, and a dust core can also be used.
  • FIG. 3 is a perspective view showing an overall configuration of a transformer device according to the present embodiment.
  • the transformer device has a transformer body 1 formed by winding a twisted coil 11 formed by intertwisting two kinds of insulated wires around a toroidal core (formed into almost a rectangular shape in a cross section having an annular shape) 31 in a circumferential direction at almost the same pitch, and a bobbin 41 for housing the transformer body 1, and six terminal pins 51(1) to 51(6) which extend from the bobbin 41 in a downward direction in the figure, and are electrically connected hereto in end parts of predetermined insulated wires 11A and 11B of the twisted coil 11.
  • the bobbin 41 has left and right step parts (the step part on a deep side (right side in the figure) is hidden by a front wall part 42) 44 formed between the front wall part 42 and a rear wall part 43, a recessed part 46 surrounded on four sides by the front and rear wall parts 42 and 43 and the left and right step parts 44, and a pair of circuit board butting parts 45A and 45B projecting from a bottom part of the recessed part 46 toward a downward direction in the figure.
  • the transformer device has primary side terminal pins 51(1) to 51(3) which extend from a lower surface of the step part 44 on a left side in the figure in the bobbin 41 to a downward direction in the figure, and are arranged in parallel to each other, and secondary side terminal pins 51(4) to 51(6) which extend from the lower surface of the step part (not shown) 44 on a right side in the figure in the bobbin 41 to the downward direction in the figure, and are arranged in parallel to each other.
  • the transformer body 1 is stored therein in such a manner that, in a state in which a central axis extends in a direction of the front and rear wall parts 42 and 43, a part thereof is fitted into the recessed part 46 described above. Moreover, among parts of the twisted coil 11 wound therearound, the end parts of the one-layer insulated wire (such as UEW) 11A being a primary side coil are electrically connected to the terminal pins 51(1) to 51(3), and meanwhile, the end parts of the three-layer insulated wire (such as TEX and TIW) 11B being a secondary side coil are electrically connected to the terminal pins 51(4) to 51(6) .
  • the one-layer insulated wire such as UEW
  • TEX and TIW three-layer insulated wire
  • the pair of circuit board butting parts 45A and 45B each are a columnar member long in a front-rear direction and having a bottom surface formed into a planar form, and are formed into almost the same shape.
  • a distance between a bottom surface of the bobbin 42 and the surface of the circuit board is regulated by the circuit board butting parts 45A and 45B, and the terminal pins 51(1) to 51(6) are exposed above the surface of the circuit board over a predetermined length from root parts thereof.
  • a spacing in which the primary side coil and the secondary side coil are to be connected can be secured in the root parts of the terminal pins.
  • FIG. 4 shows an arrangement of individual terminal pins 51(1) to 51(6), and a connection state of coils to the terminal pins 51(1) to 51(6) when the terminal pins 51(1) to 51(6) are viewed from a back side of the transformer device shown in FIG. 3 .
  • FIG. 5 shows a winding state of primary side coils (UEW) 11A1 and 11A2 and secondary side coils (TEX) 11B1 and 11B2 wound around a core 31A.
  • UEW primary side coils
  • TEX secondary side coils
  • the twisted coil 11 to be wound around the core 31A is split into a first twisted coil 111A to be wound around a part on a left side of the core 31A in the figure, and a second twisted coil 111B to be wound around a part on a right side of the core 31A in the figure, and both coils are configured to be electrically coupled to the terminal pin 51(1) in the primary side coil, and to the terminal pin 51(4) in the secondary side coil, respectively.
  • the end parts of the one-layer insulated wire (UEW) 11A being the primary side coil are configured to be electrically connected to the terminal pins 51(1) to 51(3), and meanwhile, the end parts of the three-layer insulated wire (TEX) 11B being the secondary side coil are configured to be electrically connected to the terminal pins 51(4) to 51(6).
  • the primary side coil (UEW) 11A1 (first twisted coil 111A) which extends from the terminal pin 51(2) (a symbol S standing for START is provided), and is started in winding the wire around the core 31A is wound around the part on the right side of the core 31A, in the figure, and then connected to the terminal pin 51(1).
  • the primary side coil (UEW) 11A2 (second twisted coil 111B) is connected to the terminal pin 51(1), in the figure, and wound around the part on the left side of the core 31A, and then connected to the terminal pin 51(3) (a symbol F standing for FINISH is provided).
  • the secondary side coil (TEX) 11B1 (first twisted coil 111A) which extends from the terminal pin 51(6) (a symbol S standing for START is (rovided), and is started in winding the wire around the core 31A is wound around the part on the left side of the core 31A, in the figure, and then connected to the terminal pin 51(4) .
  • the secondary side coil (TEX) 11B2 (second twisted coil 111B) is connected to the terminal pin 51(4), in the figure, and wound around the part on the right side of the core 31A, and then connected to the terminal pin 51(5) (a symbol F standing for FINISH is provided) .
  • twisting pitch P of the twisted coil 11 is adjusted to a level less than 3 mm, it becomes hard to maintain a linear shape of the twisted wire, resulting in difficulty in satisfactorily winding the wire around the core 31.
  • the twisting pitch P of the twisted coil 11 is over 10 mm, it becomes hard to suppress loosening or untwisting of twist during winding the wire for the twisted coil 11, and efficiency of the winding work is significantly reduced.
  • the twisting pitch P of the twisted coil 11 is set to the range: 3 mm ⁇ P ⁇ 10 mm in efficiently winding the twisted coil 11 around the core 31 in an original shape.
  • twisting pitch P it is further preferably to set the twisting pitch P to the range: 4 mm ⁇ P ⁇ 9 mm
  • the twisting pitch P of the twisted coil 11 is set in the range of 3 mm or more and 10 mm or less, it is hard to use such a material unless the material can maintain a satisfactory state also in view of the characteristics. Then, in the range in which the twisting pitch P of the twisted coil 11 is 3 mm or more and 10 mm or less, verification has been made on whether or not a satisfactory value can be obtained in view of the characteristics (frequency characteristics of passage loss (insertion loss), frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51(2) and 51(3)) and frequency characteristics of reflection loss (return loss) (secondary side: between terminal pins 51(5) and 51(6))).
  • the characteristics frequency characteristics of passage loss (insertion loss), frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51(2) and 51(3)) and frequency characteristics of reflection loss (return loss)
  • FIG. 6 represents each graph showing frequency characteristics of passage loss (insertion loss) when a coil twisting pitch P is changed with regard to the present embodiment.
  • the twisting pitch P is changed from 3 mm to 10 mm at an increment of 1 mm, and each graph in FIG. 6 to FIG. 8 shows a change in the characteristics for a material having each pitch.
  • a primary side coil of the twisted coil 11 at this time is a one-layer insulated wire (2UEW: 0.0155 mm-thick) 11A
  • a secondary side coil of the twisted coil 11 is a three-layer insulated wire (TEX-E: 0.1 mm-thick) 11B.
  • a coil diameter D is 0.23 mm (the same in the graphs shown in FIG. 7 and FIG. 8 ).
  • FIG. 7 represents each graph showing frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51 (2) and 51 (3)) when a coil twisting pitch P is changed with regard to the present embodiment.
  • FIG. 8 represents each graph showing frequency characteristics of reflection loss (return loss) (secondary side: between terminal pins 51 (5) and 51 (6)) when a coil twisting pitch P is changed with regard to the present embodiment.
  • the wire diameter in the description of the present application represents a cross sectional diameter of the conducting wire, excluding the insulation coating.
  • FIG. 9 represents each graph showing frequency characteristics of passage loss (insertion loss) when a wire diameter D is changed with regard to the present embodiment.
  • a coil diameter D is sequentially changed from 0.2 mm to 0.45 mm, and each graph in FIG. 9 to FIG. 11 shows a change in the characteristics for a material having each diameter.
  • a primary side coil of the twisted coil 11 at this time is a one-layer insulated wire (2UEW: 0.0155 mm-thick), and a secondary side coil of the twisted coil 11 is a three-layer insulated wire (TEX-E: 0.1000 mm-thick), and a twisting pitch P of the twisted coil 11 is 5 mm (the same in the graphs shown in FIG. 10 and FIG. 11 ).
  • FIG. 10 represents each graph showing frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51(2) and 51(3)) when a wire diameter D is changed with regard to the present embodiment.
  • FIG. 11 represents each graph showing frequency characteristics of reflection loss (return loss) (secondary side: between terminal pins 51 (5) and 51 (6)) when a wire diameter D is changed with regard to the present embodiment.
  • a coating thickness (thickness of an insulating material coating a circumference of a metal conducting wire) T of the twisted coil 11 either 1UEW (0.0230 mm-thick) or 2UEW (0.0155 mm-thick) each ordinarily used is selected for a primary side coil, and either TEX-E (0.1000 mm-thick) or TIW-2 (0.1200 mm-thick) each ordinarily used is selected for a secondary side coil, and a total coating thickness T has been set by combining coating thicknesses of individual insulated wires 11A and 11B selected.
  • a combination of TEX-E (0.1000 mm-thick) and 1UEW (0.0230 mm-thick) results in a thickness of 0.1230 mm
  • a combination of TEX-E (0.1000 mm-thick) and 2UEW (0.0155 mm-thick) results in a thickness of 0.1155 mm
  • a combination of TIW-2 (0.1200 mm-thick) and 1UEW (0.0230 mm-thick) results in a thickness of 0.1430 mm
  • a combination of TIW-2 (0.1200 mm-thick) and 2UEW (0.0155 mm-thick) results in a thickness of 0.1355 mm.
  • a coating thickness T is changed as an object to be measured in view of characteristics (frequency characteristics of passage loss (insertion loss), frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51(2) and 51(3)) and frequency characteristics of reflection loss (return loss) (secondary side: between terminal pins 51(5)and 51(6)), when the coating thickness T is adjusted in the range of 0.1155 mm or more and 0.1430 mm or less.
  • FIG. 12 represents each graph showing frequency characteristics of passage loss (insertion loss) when a coil coating thickness T is changed with regard to the present embodiment.
  • a coil coating thickness T is changed from 0.1155mm to 0.1430mm in four stages, and the graph in FIG. 12 shows each change in the characteristics for a material having each thickness.
  • a twisting pitch P of the twisted coil 11 at this time is 5 mm and a coil diameter D is 0.20 mm (the same in the graphs shown in FIG. 13 and FIG. 14 ).
  • FIG. 13 represents each graph showing frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51(2) and 51(3)) when a coil coating thickness T is changed with regard to the present embodiment.
  • FIG. 14 represents each graph showing frequency characteristics of reflection loss (return loss) (secondary side: between terminal pins 51(5) and 51(6)) when a coil coating thickness T is changed with regard to the present embodiment.
  • all of the coil twisting pitch P, the coil diameter D and the coil coating thickness T are preferably set to set values verified in the embodiment for the twisted coil 11 described above. However, even if one or two of the elements are out of the verified range, the transformer device can have satisfactory characteristics to a certain degree.
  • constituent materials of the core, the conducting wire of the coil, the bobbin and the insulation coating are not limited to the materials in the embodiment described above, and various other materials can be used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP18162449.5A 2017-03-30 2018-03-19 Transformer device Active EP3382724B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017066589A JP6816609B2 (ja) 2017-03-30 2017-03-30 トランス装置

Publications (2)

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EP3382724A1 EP3382724A1 (en) 2018-10-03
EP3382724B1 true EP3382724B1 (en) 2020-08-19

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JP7211152B2 (ja) * 2019-02-25 2023-01-24 日立金属株式会社 トランス装置
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WO2025042578A1 (en) * 2023-08-24 2025-02-27 Witricity Corporation Hybrid sectional-bifilar wound filters

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EP3382724A1 (en) 2018-10-03
JP6816609B2 (ja) 2021-01-20
JP2018170397A (ja) 2018-11-01

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