WO2022079871A1 - Transformateur et dispositif de conversion de puissance - Google Patents

Transformateur et dispositif de conversion de puissance Download PDF

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Publication number
WO2022079871A1
WO2022079871A1 PCT/JP2020/038985 JP2020038985W WO2022079871A1 WO 2022079871 A1 WO2022079871 A1 WO 2022079871A1 JP 2020038985 W JP2020038985 W JP 2020038985W WO 2022079871 A1 WO2022079871 A1 WO 2022079871A1
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Prior art keywords
coil
core
turns
coils
transformer
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PCT/JP2020/038985
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English (en)
Japanese (ja)
Inventor
俊悟 平谷
和嗣 草別
成治 高橋
Original Assignee
住友電気工業株式会社
住友電装株式会社
株式会社オートネットワーク技術研究所
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Priority to PCT/JP2020/038985 priority Critical patent/WO2022079871A1/fr
Publication of WO2022079871A1 publication Critical patent/WO2022079871A1/fr

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    • 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
    • H01F30/10—Single-phase transformers
    • 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
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • This disclosure relates to transformers and power converters.
  • Patent Documents 1 to 3 disclose a multi-output transformer.
  • the multi-output transformer comprises at least three coils.
  • the at least three coils include a first coil on the input side and a second coil and a third coil on the output side.
  • Patent Documents 1 and 2 the first coil, the second coil, and the third coil are arranged side by side in the axial direction of the core. Further, in Patent Document 3, the first coil, the second coil, and the third coil are arranged side by side in the radial direction of the core.
  • Japanese Unexamined Patent Publication No. 8-65904 Japanese Patent Application Laid-Open No. 2003-018827 Japanese Unexamined Patent Publication No. 2016-140126
  • the transformers in this disclosure are With the first coil With the second coil With the third coil A transformer with a core that penetrates these multiple coils.
  • the number of turns of the third coil is smaller than the number of turns of the first coil and the number of turns of the second coil.
  • the conductor cross-section of the third coil is larger than the conductor cross-section of the first coil and the conductor cross-section of the second coil.
  • the plurality of coils are arranged coaxially, and the plurality of coils are arranged coaxially.
  • the first coil and the second coil are arranged so as to have turns that are radially aligned with each other.
  • the third coil is arranged side by side in the axial direction with respect to the first coil and the second coil.
  • the power converter of the present disclosure is The transformer of the present disclosure is provided.
  • FIG. 1 is a schematic view of a vehicle equipped with the power conversion device according to the first embodiment and a charging device for supplying electric power to the vehicle.
  • FIG. 2 is a circuit diagram of the power conversion device according to the first embodiment.
  • FIG. 3 is a schematic perspective view of the transformer according to the first embodiment.
  • FIG. 4 is an exploded perspective view of the transformer according to the first embodiment.
  • FIG. 5 is an exploded perspective view of a plurality of coils and cores in the transformer according to the first embodiment.
  • FIG. 6 is an exploded perspective view of a plurality of coils provided in the transformer according to the first embodiment.
  • FIG. 7 is a VII-VII cross-sectional view of the plurality of coils shown in FIG.
  • one of the purposes of the present disclosure is to provide a transformer having a structure that does not become too large in the radial direction and the axial direction of the core, and a power conversion device including the transformer.
  • the transformer according to the embodiment is With the first coil With the second coil With the third coil A transformer with a core that penetrates these multiple coils.
  • the number of turns of the third coil is smaller than the number of turns of the first coil and the number of turns of the second coil.
  • the conductor cross-section of the third coil is larger than the conductor cross-section of the first coil and the conductor cross-section of the second coil.
  • the plurality of coils are arranged coaxially, and the plurality of coils are arranged coaxially.
  • the first coil and the second coil are arranged so as to have turns that are radially aligned with each other.
  • the third coil is arranged side by side in the axial direction with respect to the first coil and the second coil.
  • the first coil and the second coil are arranged so as to have turns aligned in the radial direction with each other.
  • the first coil and the second coil are arranged so that the forming range of the first coil and the forming range of the second coil in the axial direction overlap. Therefore, the transformer according to the embodiment has a smaller axial size than a transformer in which the first coil, the second coil, and the third coil are arranged in the axial direction.
  • the third coil having a larger conductor cross section than the first coil and the second coil is arranged side by side in the axial direction of the first coil and the second coil.
  • the first coil, the second coil, and the third coil are smaller in the radial direction than the transformer in which the first coil, the second coil, and the third coil are arranged in the radial direction. Therefore, the transformer according to the embodiment does not become too large in the radial direction and the axial direction.
  • the length along the axial direction in the conductor cross section of the third coil is along the axial length in the conductor cross section of the first coil and along the axial direction in the conductor cross section of the second coil.
  • a form shorter than the length can be mentioned.
  • the shape of the conductor cross section of the third coil which has a conductor cross section larger than that of the first coil and the second coil, is a flat shape that is long in the radial direction. Since the number of turns of the third coil is not large, even if the conductor cross section of the third coil is flat in the radial direction, the number of turns of the third coil stacked in the axial direction does not become too large. Therefore, the configuration of the above-mentioned form ⁇ 2> is unlikely to be large in the axial direction as compared with the case where the conductor cross section of the third coil is not flat in the axial direction.
  • each turn of the first coil and each turn of the second coil are arranged alternately in the radial direction two or more times in succession.
  • the coil loss may increase due to the influence of the proximity effect.
  • the configuration of the above embodiment ⁇ 3> in a transformer having a portion where the turns of the first coil and the turns of the second coil whose current directions are opposite to each other are alternately arranged in the radial direction, the influence of the proximity effect. Is reduced, so that the coil loss is likely to be reduced. Therefore, the configuration of the above embodiment ⁇ 3> has a lower loss than the configuration in which the first coil and the second coil are arranged in the radial direction.
  • the first coil and the second coil are provided in a plurality of stages in the axial direction. Examples thereof include a form having a portion where two turns adjacent to each other in the axial direction are a turn of the first coil and a turn of the second coil, respectively.
  • Coil loss is reduced when the turns of different coils are arranged alternately in the axial direction, rather than when multiple turns provided in the same coil are continuous in the axial direction. Therefore, the configuration of the above embodiment ⁇ 4> has a lower loss than the configuration in which the first coil and the second coil are arranged in the axial direction.
  • ⁇ 5> As one form of the transformer according to the embodiment, Examples thereof include a form in which the first coil and the second coil are sandwiched between two turns provided in the third coil.
  • the third coil having a large conductor cross section can be used at a lower voltage than the first coil and the second coil. If the third coil used at a low voltage is arranged at both ends in the axial direction of the coil assembly, it is easy to secure insulation between the coil assembly and a member close to the coil assembly.
  • Both the first coil and the second coil may be formed by a flat wire wound in a flatwise manner.
  • the size of the transformer is unlikely to increase in the radial direction of the coil.
  • the third coil may be formed of an edgewise wound flat wire or a flat plate-shaped bus bar.
  • the third coil is an edgewise wound flat flat wire or a flat plate-shaped bus bar, it is difficult to increase the size of the third coil in the axial direction. Therefore, in the configuration of the above embodiment ⁇ 7>, the size of the transformer is unlikely to increase in the axial direction of the coil.
  • the core is A middle core that penetrates the plurality of coils, The first end core connected to the first end of the middle core, A second end core connected to the second end of the middle core, A first side core connecting the first end core and the second end core on the outside of the plurality of coils, Examples thereof include a form in which a second side core connecting the first end core and the second end core is provided on the outside of the plurality of coils.
  • the first coil, the second coil, and the third coil are centrally provided in the middle core. Therefore, in the above form ⁇ 8>, the size of the transformer is unlikely to increase.
  • a base on which an assembly of the plurality of coils and the core is placed is provided.
  • An example is a form including a heat radiating member arranged between the base portion and the plurality of coils.
  • the heat generated by the plurality of coils is easily dissipated to the base portion via the heat radiating member. Therefore, in the configuration of the above form ⁇ 9>, the magnetic characteristics of the transformer are likely to be stable.
  • the braid is physically protected by the case and the potting resin. Further, the potting resin enters between the turns of the plurality of coils and functions as a heat dissipation path. Therefore, the heat generated by the plurality of coils is easily dissipated to the case via the potting resin.
  • the power conversion device is The transformer according to any one of the above forms ⁇ 1> to ⁇ 10> is provided.
  • the transformer of the embodiment provided in the power conversion device according to the embodiment is not too large in the radial direction and the axial direction. Therefore, the power conversion device according to the embodiment including the transformer according to the embodiment is small.
  • the first circuit connected to the first coil and The second circuit connected to the second coil and A third circuit connected to the third coil is provided.
  • the first circuit and the second circuit include a DC / AC conversion circuit.
  • the third circuit may include a rectifier circuit.
  • the power conversion device of the above embodiment ⁇ 12> can change the direct current input to the first circuit to a direct current of a different voltage, and output the changed direct current from at least one of the second circuit and the third circuit. Further, the power conversion device of the above embodiment ⁇ 12> changes the direct current input to the second circuit to a direct current of a different voltage by controlling the first circuit, the second circuit, and the third circuit, and the change thereof. The generated direct current can be output from at least one of the first circuit and the third circuit.
  • the vehicle 100 in this example is a hybrid vehicle.
  • the vehicle 100 of this example includes a high-voltage battery 8 that supplies electric power to a motor that drives the vehicle 100, and a low-voltage battery 9 that supplies electric power to auxiliary equipment.
  • the power conversion device 1 has a function of charging the batteries 8 and 9 with the electric power from the AC power source 4 outside the vehicle 100. Further, the power conversion device 1 of this example also has a function of discharging the power of the high voltage battery 8 to the outside of the vehicle 100.
  • the power conversion device 1 of this example includes a multi-output transformer 2, a first circuit 5, a second circuit 6, a third circuit 7, a PFC (Power Factor Direction) circuit 40, a capacitor 41, and a control unit 10 (see FIG. 2). ).
  • the PFC circuit 40 and the capacitor 41 are provided between the AC power supply 4 and the first circuit 5.
  • the PFC circuit 40 is a circuit that generates a stable direct current from an alternating current supplied from an alternating current power source 4 outside the vehicle 100.
  • the capacitor 41 reduces feedback noise.
  • FIG. 2 is mainly referred to. In FIG. 2, the PFC circuit 40 and the capacitor 41 are not shown.
  • the transformer 2 of this example includes a first coil 21, a second coil 22, a third coil 23, and a core 25.
  • the third coil 23 of this example is a center tap type coil in which two coils are connected in series and the connection node serves as one of the output terminals. The specific structure of the transformer 2 will be described later.
  • the first circuit 5 of this example is a DC / AC conversion circuit connected to the first coil 21.
  • the first circuit 5 converts the direct current supplied from the PFC circuit 40 (see FIG. 1) into an alternating current via the input unit 50, and supplies the alternating current to the first coil 21.
  • the first circuit 5 of this example also has a function of converting an alternating current from the first coil 21 into a direct current and supplying the direct current to the outside of the vehicle 100.
  • the first circuit 5 of this example includes four switching elements 51 that are bridge-connected.
  • the switching element 51 of this example is a FET (Field Effect Transistor).
  • the second circuit 6 of this example is a DC / AC conversion circuit connected to the second coil 22.
  • the second circuit 6 converts the alternating current supplied from the second coil 22 into a direct current.
  • the direct current is charged into the high voltage battery 8 (see FIG. 1) via the output unit 60.
  • the second circuit 6 of this example also has a function of converting the direct current supplied from the high-voltage battery 8 via the output unit 60 into alternating current and supplying the alternating current to the second coil 22.
  • the second circuit 6 of this example includes four switching elements 61 that are bridge-connected.
  • the switching element 61 of this example is an FET.
  • the third circuit 7 of this example is a rectifier circuit connected to the third coil 23.
  • the third circuit 7 converts the alternating current supplied from the third coil 23 into a direct current.
  • the direct current is charged into the low voltage battery 9 (see FIG. 1) via the output unit 70.
  • the third circuit 7 of this example includes two switching elements 71, an inductor 72, and a capacitor 73.
  • the switching element 71 of this example is an FET.
  • the inductor 72 and the capacitor 73 form an L-shaped low-pass filter.
  • the low-pass filter may be a ⁇ -type filter or a T-type filter.
  • the control unit 10 controls the operations of the first circuit 5, the second circuit 6, and the third circuit 7. More specifically, the on / off of the switching elements 51, 61, 71 of each circuit 5, 6, 7 is controlled.
  • the control unit 10 charges the high-voltage battery 8 and the low-voltage battery 9 from the AC power supply 4 shown in FIG. 1, charges the high-voltage battery 8 to the low-voltage battery 9, and discharges the high-voltage battery 8 to the outside of the vehicle 100. Is switched.
  • the high-voltage battery 8 may charge the low-voltage battery 9 and discharge the low-voltage battery 9 to the outside at the same time.
  • the control unit 10 is typically composed of a computer.
  • the computer includes a processor, a memory, and the like.
  • a program for causing the processor to execute the above control is stored in the memory.
  • the processor reads and executes the program stored in the memory.
  • the structure of the transformer 2 of this example will be described with reference to FIGS. 3 to 7.
  • the transformer 2 of this example includes a core 25, a first coil 21, a second coil 22, and a third coil 23.
  • the first coil 21, the second coil 22, and the third coil 23 are arranged coaxially.
  • the assembly 20 of the core 25 and the plurality of coils 21, 22, 23 is housed in the case 3.
  • the core core 25 includes a middle core 25A, a first end core 25B, a second end core 25C, a first side core 25D, and a second side core 25E, as shown in FIG.
  • the middle core 25A penetrates the first coil 21, the second coil 22, and the third coil 23. Therefore, the axial direction of the middle core 25A and the axial direction of the three coils 21, 22, and 23 coincide with each other.
  • the first end core 25B is connected to the first end of the middle core 25A.
  • the second end core 25C is connected to the second end of the middle core 25A.
  • the first side core 25D and the second side core 25E connect the first end core 25B and the second end core 25C on the outside of the three coils 21, 22 and 23, respectively.
  • the middle core 25A, the first side core 25D, and the second side core 25E are arranged in parallel.
  • the core 25 is configured by combining the first divided piece 251 and the second divided piece 252.
  • the first division piece 251 is a substantially E-shaped magnetic material composed of a middle core 25A, a first end core 25B, a first side core 25D, and a second side core 25E.
  • the second divided piece 252 is a substantially I-shaped magnetic body composed of the second end core 25C. By combining the two divided pieces 251,252, a core 25 having a substantially eight-shaped shape is formed.
  • the core 25 in addition to the combination of the E-type divided piece and the I-type divided piece of this example, the combination of the E-type divided piece and the E-type divided piece, the combination of the E-type divided piece and the T-type divided piece, or the U A combination of a mold dividing piece and a T-shaped dividing piece may be used.
  • the shape of the core 25 may be annular, unlike this example.
  • the core 25 is a sintered body such as a ferrite core.
  • the core 25 may be a powder compact, a composite material molded body, or a laminated steel plate.
  • the compaction compact is a magnetic member obtained by compression molding soft magnetic powder.
  • the molded body of the composite material is a magnetic member obtained by curing a fluid resin in which soft magnetic powder is dispersed.
  • the laminated steel sheet is a laminated body in which electromagnetic steel sheets are laminated.
  • first coil 21 and the second coil 22 of this example are formed in a substantially rectangular annular shape. Unlike this example, the first coil 21 and the second coil 22 may be substantially annular.
  • the first coil 21 and the second coil 22 are arranged so as to have turns 21t and 22t that are radially aligned with each other.
  • the first coil 21 and the second coil 22 are arranged so as to overlap each other in the axial direction of the middle core 25A (FIG. 5).
  • the arrangement of the turns 21t and 22t of the first coil 21 and the second coil 22 will be described later.
  • the first coil 21 and the second coil 22 are each configured by spirally winding the winding 2w.
  • the winding 2w is a square wire having a square cross section, a flat wire having a rectangular cross section, a round wire having a circular cross section, or the like.
  • the winding 2w of this example is a coated flat wire having an insulating coating on the outer periphery of the flat wire.
  • the flat wire is composed of copper, a copper alloy, aluminum, an aluminum alloy, or the like.
  • the insulating coating is made of an insulating material such as enamel.
  • the first coil 21 and the second coil 22 of this example are composed of flatwise wound flat wires.
  • the aspect ratio of the cross section of the flat line is preferably more than 1 and 25 or less.
  • the lower limit of the aspect ratio may be 1.5 or even 2.0.
  • the upper limit of the aspect ratio may be 20 or even 15.
  • a more preferable aspect ratio is 1.5 or more and 15 or less.
  • the first end portion 21a and the second end portion 21b of the first coil 21, and the first end portion 22a and the second end portion 22b of the second coil 22 each have four outer peripheral edges of the rectangular annular coils 21 and 22, respectively. Placed in the corner. Both ends 22a and 22b of the second coil 22 are arranged on the terminals 23a and 23d of the third coil 23, which will be described later.
  • the insulating coating is peeled off at the ends of both coils 21 and 22.
  • the positions and drawing directions of the first terminals 21a and 22a and the second terminals 21b and 22b are not limited.
  • all the terminals 21a, 21b, 22a, 22b may be arranged on the radial outer peripheral edge of the third coil 23 on the side where the terminals 23a, 23b are arranged, or the terminals 23a, 23b may be arranged. It may be arranged on the side opposite to the side of the coil.
  • the drawing direction of the terminals 21a, 21b, 22a, 22b may be outside the radial direction of the first coil 21 and the second coil 22.
  • the number of turns T1 of the first coil 21 is larger than the number of turns T2 of the second coil 22. Unlike this example, the number of turns T1 of the first coil 21 may be the same as or less than the number of turns T2 of the second coil 22.
  • the conductor cross-section S1 of the first coil 21 is the same as the conductor cross-section S2 of the second coil 22.
  • the conductor cross-section S 1 may be larger or smaller than the conductor cross-section S 2 .
  • the conductor cross-sectional area S 1 is the cross-sectional area of the conductor of the winding 2w constituting the first coil 21.
  • the conductor cross-sectional area S 2 is the cross-sectional area of the conductor of the winding 2w constituting the second coil 22.
  • the first coil 21 and the second coil 22 of this example are provided in two stages in the axial direction of the middle core 25A.
  • the lower portion and the upper portion of the first coil 21 are connected by the innermost circumference in the radial direction.
  • the lower portion of the first coil 21 is formed by a winding 2w wound inward in the radial direction from the position of the first end portion 21a.
  • the winding 2w is curved diagonally upward from the innermost circumference of the lower stage portion, and shifts to the upper end portion of the first coil 21.
  • the winding 2w transferred to the upper portion is wound from the inside to the outside in the radial direction to form the upper end portion of the first coil 21.
  • the lower portion and the upper portion of the second coil 22 are also connected at the innermost circumference in the radial direction, similarly to the first coil 21.
  • the lower portion of the second coil 22 is formed by a winding 2w wound inward in the radial direction from the position of the first end portion 22a.
  • the winding 2w is curved diagonally upward from the innermost circumference of the lower stage portion, and shifts to the upper end portion of the second coil 22.
  • the winding 2w transferred to the upper portion is wound from the inside to the outside in the radial direction to form the upper end portion of the first coil 22.
  • both coils 21 and 22 may have one stage or three or more stages. Further, the number of stages of the first coil 21 and the number of stages of the second coil 22 may be different.
  • the turn 21t of the first coil 21 and the turn 22t of the second coil 22 are alternately arranged in the radial direction except for a part on the inner side in the radial direction. ..
  • On the inner peripheral side in the radial direction there is a portion where the turn 21t of the first coil 21 is continuous in the radial direction.
  • the reason why such a portion occurs is that the number of turns T1 of the first coil 21 is larger than the number of turns T2 of the second coil 22. Coil loss is reduced when the turns of different coils are arranged alternately in the radial direction rather than the plurality of turns provided in the same coil being continuous in the radial direction.
  • the coil loss of the first coil 21 and the second coil 22 of this example is reduced.
  • the turns 21t and the turns 22t are alternately arranged in the radial direction at all points.
  • a coil-shaped insulating member may be interposed between the turn 21t of the first coil 21 and the turn 22t of the second coil 22.
  • the turn 21t of the first coil 21 and the second coil 22 are excluded except for a part on the inner side in the radial direction.
  • Turns 22t and 22t are arranged alternately in the axial direction. Coil loss is reduced when the turns of different coils are arranged alternately in the axial direction, rather than when a plurality of turns provided in the same coil are continuous in the axial direction. Therefore, the coil loss of the first coil 21 and the second coil 22 of this example is reduced.
  • the turns 21t and the turns 22t are arranged alternately in the axial direction at all points.
  • the turn 21t of the first coil 21 and the turn 22t of the second coil 22 alternate in the axial direction. It is preferable to line up in.
  • the first coil 21 and the second coil 22 of this example having the above-mentioned structure are manufactured by a known method.
  • a winding 2w constituting the first coil 21 and a winding 2w constituting the second coil 22 are prepared.
  • An inclined portion in which a flat wire is inclined in the width direction is provided in the middle portion of each winding 2w. It is assumed that the winding 2w is arranged in parallel with a portion other than the inclined portion shifted in the width direction. Both windings 2w are overlapped with the positions of the inclined portions aligned.
  • a prismatic jig is arranged on the inclined portion, and both side portions of the inclined portion in the winding 2w are wound toward the radial outer circumference of the jig. As a result, the upper and lower two-stage first coil 21 and the second coil 22 shown in FIG. 6 are obtained.
  • the number of turns T3 of the third coil 23 is smaller than the number of turns T1 of the first coil 21 and the number of turns T2 of the second coil 22.
  • the number of turns T 3 is 1/25 or more and 1/3 or less of the number of turns T 1 and T 2 .
  • the third coil 23 of this example is a center tap type, and when the transformer 2 is operated, a current flows only in one of the turn 231 and the turn 232. Therefore, the number of turns of the third coil 2 in the transformer 2 is 1.
  • the voltage is proportional to the number of turns and the current is inversely proportional to the number of turns.
  • the voltage E 3 generated in the third coil 23 by the voltage E 1 applied to the first coil 21 or the voltage E 2 applied to the second coil 22 is lower than the voltage E 1 and the voltage E 2 . .. That is, the third coil 23 is a low voltage coil.
  • the current I 3 generated in the third coil 23 having a small number of turns is larger than the current I 1 flowing in the first coil 21 and the current I 2 flowing in the second coil 22.
  • the conductor cross-sectional area S3 of the third coil 23 of this example is the conductor cross-sectional area S1 of the first coil 21 and the conductor cross-sectional area of the second coil 22 so that a large current can flow through the third coil 23. It is larger than S2.
  • the conductor cross-sectional area S 3 is the cross-sectional area of each turn 231,232 of the third coil 23 in the cross section along the axial direction of the third coil 23.
  • the conductor cross-section S 3 is, for example, twice or more and 10 times or less the conductor cross-sections S 1 and S 2 . Further, the conductor cross-section S 3 may be 3 times or more and 7 times or less the conductor cross-sections S 1 and S 2 .
  • Each turn 231,232 of the third coil 23 of this example is composed of a flat plate-shaped bus bar.
  • the turns 231,232 are formed in a rectangular ring that is not partially connected.
  • the turns 231,232 of this example cover the entire axial end surface of the winding portion of the first coil 21 and the second coil 22.
  • the turns 231,232 may be smaller than the axial end faces of the winding portions of the first coil 21 and the second coil 22.
  • the third coil 23 may be configured by an edgewise wound flat wire.
  • the turn 231 arranged above is provided with terminals 23a and 23b.
  • the cut of the turn 231 is arranged between 12 o'clock and 1 o'clock.
  • the terminal 23a is connected to the end of the turn 231 arranged at the 1 o'clock position.
  • the terminal 23b is connected to the outer peripheral edge of the turn 231 arranged at the 12 o'clock position.
  • the terminals 23a and 23b extend upwardly orthogonal to the turn 231.
  • the terminals 23a and 23b are formed by bending the plate material constituting the turn 231.
  • the terminals 23a and 23b are provided with screw holes 23h for screwing. The screw hole 23h may be omitted.
  • the turn 232 arranged below is provided with terminals 23c and 23d.
  • the cut of the turn 232 is arranged between 11 o'clock and 12 o'clock.
  • the terminal 23d is connected to the end of the turn 232 located at the 11 o'clock position.
  • the terminal 23c is connected to the outer peripheral edge of the turn 232 arranged at the 12 o'clock position.
  • the terminals 23c and 23d are formed by bending the plate material constituting the turn 232.
  • the terminals 23c and 23d are provided with screw holes 23h for screwing.
  • the terminal 23b of the turn 231 and the terminal 23c of the turn 232 are overlapped and conducted to be conducted.
  • the terminals 23b and 23c form a center tap.
  • the aspect ratio of the conductor cross section of turns 231,232 is 10 or more. A more preferable aspect ratio is 20 or more, and a more preferable aspect ratio is 30 or more.
  • the aspect ratio of the conductor cross section of turns 231 and 232 becomes larger, the length L3 along the axial direction in the conductor cross section of turns 231 and 232 becomes shorter as shown in FIG.
  • the length L3 is shorter than the length L1 along the axial direction in the conductor cross section of each turn 21t of the first coil 21 and the length L2 along the axial direction in the conductor cross section of each turn 22t of the second coil 22. Is preferable.
  • the length L3 is drawn longer than the actual length in order to make the turns 231 and 232 of the third coil 23 easy to understand. If the length L3 is short, the axial length of the coil structure composed of the first coil 21, the second coil 22, and the third coil 23 becomes short. Therefore, the axial length of the middle core 25A provided with the coil structure is shortened. As a result, the size of the transformer 2 along the axial direction of the coil structure becomes small.
  • the third coil 23 is arranged side by side in the axial direction of the first coil 21 and the second coil 22.
  • the first coil 21 and the second coil 22 are sandwiched between the two turns 231 and the turn 232 constituting the third coil 23.
  • parasitic capacitance is formed between different coils arranged in the axial direction. As the parasitic capacitance increases, noise may increase.
  • the first coil 21 and the second coil 22 are composed of flat-wise wound flat wires, compared to the case where both coils 21 and 22 are composed of edge-wise wound flat wires.
  • the area where the first coil 21, the second coil 22, and the third coil 23 face each other is small. Since the parasitic capacitance becomes smaller as the facing area becomes smaller, the coil loss is unlikely to increase in the configuration of this example.
  • Insulation member As shown in FIG. 5, in the transformer 2 of this example, insulation members 26 and 27 for ensuring insulation between the core 25 and the coils 21, 22 and 23 are provided.
  • the insulating members 26 and 27 are made of an insulating resin such as polyphenylene sulfide.
  • the insulating member 26 of this example is a flat plate-shaped member or a sheet-shaped member having a through hole 26h.
  • the middle core 25A is penetrated through the through hole 26h.
  • the insulating member 26 insulates between the first end core 25B and the turn 231 of the third coil 23.
  • the insulating member 27 is a member including a tubular portion 27c and two flange portions 27f.
  • the middle core 25A is penetrated through the tubular portion 27c.
  • the tubular portion 27c insulates between the middle core 25A and the inner peripheral surfaces of the coils 21, 22 and 23.
  • the flange portion 27f insulates between the second end core 25C and the turn
  • an insulating member 28 is arranged between the turn 231 above the third coil 23 and the first coil 21 and the second coil 22. Further, the insulating member 29 is also arranged between the turn 232 below the third coil 23 and the first coil 21 and the second coil 22.
  • the insulating members 28 and 29 of this example are sheet-shaped members made of an insulating resin.
  • the insulating members 28 and 29 are provided with through holes 28h and 29h through which the middle core 25A of FIG. 5 is penetrated.
  • the shape of the insulating members 28 and 29 viewed from above is substantially the same as the shape of the first coil 21 and the second coil 22 viewed from above. Therefore, the insulating members 28 and 29 ensure the insulation between the third coil 23 and the first coil 21 and the second coil 22.
  • the assembly 20 of the case coils 21, 22, 23 and the core 25 is housed in the case 3 as shown in FIGS. 3 and 4.
  • the case 3 includes a base portion 30 (see FIG. 4) and a side wall portion 31.
  • the case 3 of this example further includes a plate-shaped portion 32 projecting outward in the radial direction of the side wall portion 31.
  • a non-magnetic metal such as aluminum, an aluminum alloy, magnesium, and a magnesium alloy, or a resin can be used.
  • the base portion 30 surrounded by the side wall portion 31 is higher than the plate-shaped portion 32.
  • the base portion 30 is provided with a recess 30c into which the core 25 is fitted.
  • Screw holes 32h are provided at the four corners of the plate-shaped portion 32. A screw for fixing the case 3 to the installation target is passed through the screw hole 32h.
  • the screw hole 32h may be omitted.
  • a heat radiating member 34 is arranged in a portion of the base portion 30 facing the turn 232 of the third coil 23.
  • the heat radiating member 34 include an insulating sheet material and an adhesive.
  • the heat radiating member 34 may contain a filler such as alumina and silica.
  • the braid 20 is housed in the case 3, the heat radiating member 34 is arranged between the base 30 and the turn 232 of the third coil 23.
  • the third coil 23 through which a large current flows tends to have a high temperature. If there is a heat radiating member 34, the heat generated by the third coil 23 can be easily radiated to the base portion 30. This heat dissipation makes it easy to stabilize the magnetic characteristics of the transformer 2.
  • the inside of the case 3, that is, the inside of the side wall portion 31 may be filled with the potting resin 3P.
  • the assembly 20 is physically protected by the case 3 and the potting resin 3P.
  • the potting resin 3P enters between the turns 21t, 22t, and 231,232 of each coil 21, 22, 23, and functions as a heat dissipation path. Therefore, the heat generated in each of the coils 21, 22, and 23 is easily dissipated to the case 3 via the potting resin 3P.
  • the first coil 21 and the second coil 22 are arranged so as to have turns 21t and 22t that are radially aligned with each other.
  • the first coil 21 and the second coil 22 are arranged so as to overlap each other in the axial direction. Therefore, the transformer 2 of this example is smaller in the axial direction than the transformer in which the first coil 21, the second coil 22, and the third coil 23 are aligned in the axial direction.
  • the third coil 23, which has a larger conductor cross section than the first coil 21 and the second coil 22, is arranged side by side in the axial direction of the first coil 21 and the second coil 22. ..
  • the first coil 21, the second coil 22, and the third coil 23 are smaller in the radial direction than the transformer in which the first coil 21, the second coil 22, and the third coil 23 are arranged in the radial direction. Therefore, the transformer 2 of this example does not become too large in the radial direction and the axial direction.
  • the transformer 2 provided in the power conversion device 1 of this example is not too large in the radial direction and the axial direction. Therefore, the power conversion device 1 provided with the transformer 2 of this example is smaller than the conventional configuration.
  • the transformer 2 may include one or more additional coils in addition to the coils 21, 22, 23.
  • the additional coil is a high-voltage coil corresponding to the second coil 22
  • the additional coil is arranged so as to overlap the first coil 21 and the second coil 22 in the axial direction.
  • the additional coil is a low-voltage coil corresponding to the third coil 23
  • the additional coil is arranged so as to overlap the first coil 21 and the second coil 22 in the axial direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

L'invention concerne un transformateur qui comprend une première bobine, une seconde bobine, une troisième bobine, et un noyau pénétrant à travers ces multiples bobines. La troisième bobine comporte un nombre de spires inférieur au nombre de spires de la première bobine et au nombre de spires de la deuxième bobine ; la troisième bobine comporte une surface de section transversale de conducteur supérieure à la surface de section transversale de conducteur de la première bobine et à la surface de section transversale de conducteur de la seconde bobine ; les multiples bobines sont disposées de manière coaxiale ; la première bobine et la seconde bobine sont agencées de manière à avoir des spires qui s'alignent mutuellement dans la direction radiale ; et la troisième bobine est disposée de manière alignée dans la direction axiale par rapport à la première bobine et à la deuxième bobine.
PCT/JP2020/038985 2020-10-15 2020-10-15 Transformateur et dispositif de conversion de puissance WO2022079871A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02146409U (fr) * 1989-05-16 1990-12-12
JPH0442907A (ja) * 1990-06-07 1992-02-13 Toshiba Corp 平面トランス用平面複合コイルおよびその製造方法
WO2007029594A1 (fr) * 2005-09-08 2007-03-15 Sumida Corporation Dispositif à enroulement, dispositif à enroulement composite et dispositif transformateur
JP2008205210A (ja) * 2007-02-20 2008-09-04 Densei Lambda Kk トランス
JP2018064009A (ja) * 2016-10-12 2018-04-19 オムロン株式会社 変圧器およびそれを備えた電力変換器
JP2019047105A (ja) * 2017-03-27 2019-03-22 Tdk株式会社 コイル装置
JP2019079992A (ja) * 2017-10-26 2019-05-23 富士電機株式会社 トランス

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02146409U (fr) * 1989-05-16 1990-12-12
JPH0442907A (ja) * 1990-06-07 1992-02-13 Toshiba Corp 平面トランス用平面複合コイルおよびその製造方法
WO2007029594A1 (fr) * 2005-09-08 2007-03-15 Sumida Corporation Dispositif à enroulement, dispositif à enroulement composite et dispositif transformateur
JP2008205210A (ja) * 2007-02-20 2008-09-04 Densei Lambda Kk トランス
JP2018064009A (ja) * 2016-10-12 2018-04-19 オムロン株式会社 変圧器およびそれを備えた電力変換器
JP2019047105A (ja) * 2017-03-27 2019-03-22 Tdk株式会社 コイル装置
JP2019079992A (ja) * 2017-10-26 2019-05-23 富士電機株式会社 トランス

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