WO2013065095A1 - リアクトル、変圧器およびこれを用いた電力変換器 - Google Patents

リアクトル、変圧器およびこれを用いた電力変換器 Download PDF

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Publication number
WO2013065095A1
WO2013065095A1 PCT/JP2011/075021 JP2011075021W WO2013065095A1 WO 2013065095 A1 WO2013065095 A1 WO 2013065095A1 JP 2011075021 W JP2011075021 W JP 2011075021W WO 2013065095 A1 WO2013065095 A1 WO 2013065095A1
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Prior art keywords
magnetic
reactor
core
iron core
leg iron
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PCT/JP2011/075021
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English (en)
French (fr)
Japanese (ja)
Inventor
栗田　直幸
井出　一正
Original Assignee
株式会社日立製作所
Priority date (The priority date 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 date listed.)
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Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to US14/354,107 priority Critical patent/US20140292455A1/en
Priority to EP11875137.9A priority patent/EP2775488A4/en
Priority to IN3264DEN2014 priority patent/IN2014DN03264A/en
Priority to PCT/JP2011/075021 priority patent/WO2013065095A1/ja
Priority to CN201180074398.8A priority patent/CN103890874A/zh
Publication of WO2013065095A1 publication Critical patent/WO2013065095A1/ja

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • 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
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/106—Magnetic circuits using combinations of different magnetic materials

Definitions

  • the present invention relates to a reactor and a transformer using a composite iron core, and a power converter using the same.
  • iron cores of magnetic components such as large-capacity reactor devices and transformers are made of laminated iron cores made up of multiple thin ribbon-like magnetic materials such as thin silicon steel plates and amorphous materials to reduce operating loss (iron loss). Composed.
  • the iron core of the magnetic component is formed of a magnetic path through which a magnetic flux passes by combining a plurality of laminated iron cores, and includes a magnetic leg portion around which a coil is wound and a yoke portion that connects the magnetic legs.
  • Patent Document 1 discloses a technique in which a directional electromagnetic steel sheet is used for a leg portion to be wound, and any one of a dust core, a sintered magnetic core, and a non-oriented electrical steel sheet is used for a yoke part. ing.
  • the yoke core and the magnetic leg core need to be made of different magnetic materials.
  • the yoke core and the magnetic leg core need to be made of different magnetic materials.
  • a large amount of two kinds of magnetic materials are used, resulting in an increase in manufacturing cost.
  • a dust core or sintered core is used as the material for the yoke core, the size that can be produced is limited, so it is difficult to apply it to a large capacity reactor device or transformer core. There is a problem that.
  • an object of the present invention is to provide a reactor or a transformer with low manufacturing cost and excellent low-loss characteristics, and a power converter using the same. It is to be.
  • each invention is configured as follows. That is, the reactor of the present invention includes two opposing yoke iron cores and a plurality of magnetic leg iron cores around which the coil is wound and provided with gap adjusting means, and the two opposing yoke iron cores are The plurality of magnetic leg iron cores are connected, and at least one of the connecting portions has an isotropic magnetic body made of an isotropic magnetic material.
  • the transformer of the present invention includes two opposing yoke iron cores and a plurality of magnetic leg iron cores wound with coils and provided with gap adjusting means.
  • the two opposing yoke iron cores are The plurality of magnetic leg iron cores are connected, and at least one of the connecting portions has an isotropic magnetic body made of an isotropic magnetic material.
  • the power converter of this invention is equipped with the said reactor or the said transformer. Other means will be described in the embodiment for carrying out the invention.
  • FIG. 1 It is a perspective view which shows the structure of the reactor of 1st Embodiment of this invention. It is a longitudinal section showing the structure of the reactor of a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which shows the structure of the transformer of 2nd Embodiment of this invention. It is the figure which showed the definition of the structure, a dimension, magnetic flux characteristic, and a coordinate system at the time of verifying the effect of this embodiment by the electromagnetic field calculation by a finite element method, (a) is the yoke iron core 1a and the magnetic leg iron core 3 is a diagram showing the structure, dimensions, and coordinate system of the connecting portion of FIG.
  • (b) is a vector diagram of magnetic flux B in the magnetic leg core 3 near the connecting portion
  • (c) is a connecting portion of the yoke core 1a and the magnetic leg core 3. It is a coordinate system and a perspective view.
  • the distribution of the ⁇ direction component of the magnetic flux on the connecting surface of the magnetic leg iron core 3 and the disk-shaped isotropic magnetic body 4 is calculated by the electromagnetic field calculation by the finite element method. It is the calculated
  • a magnetic leg iron core is a figure which shows the structure which is carrying out the substantially fan shape laminated
  • a magnetic leg iron core is a figure which shows the structure which is carrying out the substantially rectangular parallelepiped shape laminated
  • it is a figure which shows the structure of the fixing device of a reactor. It is a figure which shows the structure which provided the reactor of this embodiment in the power converter of the power converter of 6th Embodiment of this invention. It is a reference figure which shows the outline
  • FIG. 1 is a perspective view showing the structure of the reactor (reactor device, three-phase reactor device) of the first embodiment. Moreover, it is also a perspective view which shows the structure of the transformer (transformer apparatus, three-phase transformer apparatus) of 2nd Embodiment mentioned later.
  • FIG. 2 is a longitudinal sectional view showing the structure of the reactor of the first embodiment.
  • yoke iron cores 1a and 1b are formed by laminating a plurality of ribbon-like magnetic materials while being insulated and wound in a substantially toroidal shape (annular shape).
  • the magnetic leg iron core 3 is formed by laminating a ribbon-like magnetic material while being insulated and winding it in a substantially cylindrical shape.
  • the magnetic leg iron core 3 is provided with a longitudinal slit 3a in at least one place of a substantially cylindrical shape.
  • at least one or more gap adjustment means 5 are provided.
  • the three magnetic leg cores 3 are arranged on the circumference at an angle of 120 degrees with each other, and connect the two yoke cores 1a and 1b. The reason why the three magnetic leg cores 3 are arranged in the above-described positional relationship is to allow the reactor device of the present embodiment to function as a three-phase reactor for three-phase alternating current. This is to ensure the sex.
  • the isotropic magnetic body 4 is sandwiched between the magnetic leg iron core 3 and the yoke iron cores 1a and 1b.
  • the isotropic magnetic body 4 is a substantially thin plate-shaped component made of an isotropic magnetic material, and is composed of a dust core having a magnetic metal as a main component or a sintered core such as ferrite. This is because the material that has undergone the compacting and sintering process has a form close to polycrystal and is easily characterized by isotropic properties.
  • FIG. 1 yoke iron cores 1a and 1b, isotropic magnetic body 4, and magnetic leg iron core 3 are shown separately. Further, the arrows in FIG. 1 indicate that the yoke iron cores 1a, 1b and the isotropic magnetic body 4 are connected when the yoke iron cores 1a, 1b, the isotropic magnetic body 4 and the magnetic leg iron core 3 are assembled and connected (joined). It roughly shows the corresponding part. 1 is a “composite iron core” including the magnetic leg iron core 3, the slit 3a, the isotropic magnetic body 4, and the gap adjusting means 5, as described above. In this case, it is simply written as “iron core” as appropriate. In FIG. 1, the description of the coil 2 shown in FIG. 2 is omitted for convenience of description.
  • the yoke iron cores 1a and 1b, the magnetic leg iron core 3, the isotropic magnetic body 4, and the gap adjusting means 5 are the same as those described with reference to FIG. is there.
  • the yoke cores 1a and 1b, the isotropic magnetic body 4, and the magnetic leg core 3 are shown separately, but in FIG. 2, the yoke cores 1a and 1b and the isotropic magnetic body are shown. 4 and the magnetic leg iron core 3 are in contact with each other and indicate the assembled state. Further, only two magnetic leg cores 3 are shown for convenience of description.
  • the coil 2 is wound in the circumferential direction of the substantially cylindrical shape of the magnetic leg iron core 3.
  • This configuration electrically realizes a basic structure of a reactor in which a coil is wound around an iron core having a high magnetic permeability.
  • the coil 2 is an exciting coil and is composed of a linear conductor provided with an insulating member or a plate-like conductor.
  • the magnetic leg iron core 3 When a current is passed through the coil (excitation coil) 2, a magnetic flux is generated in the longitudinal direction of the substantially cylindrical shape of the magnetic leg iron core 3, and an eddy current flows in the circumferential direction of the magnetic leg iron core 3 due to the magnetic flux. As the loss increases. Therefore, in order to prevent this eddy current from flowing or occurring, the slit 3 a described above is provided in at least one place in the longitudinal direction of the magnetic leg core 3. Further, in order to prevent a change in inductance value and an increase in loss due to magnetic saturation of the magnetic leg iron core 3, as shown in FIG. 2 (and FIG. 1), the magnetic leg iron core 3 has at least one or more gap adjustments as described above. Means 5 are provided. In order to obtain desired characteristics (saturation characteristics, inductance value) as a reactor, the gap of the gap adjusting means 5 is adjusted during assembly.
  • an isotropic magnetic body 4 is provided.
  • the isotropic magnetic body 4 is located between the magnetic leg iron core 3 and the yoke iron cores 1a and 1b, and isotropic when the magnetic flux direction of the magnetic leg iron core 3 changes approximately 90 degrees to the magnetic flux direction of the yoke iron cores 1a and 1b. Changes in the direction of magnetic flux are handled inside the isotropic magnetic body 4 due to the characteristics of the magnetic material.
  • the isotropic magnetic body 4 is provided between the magnetic leg iron core 3 and the yoke iron cores 1a and 1b. Details of the change in magnetic flux in the isotropic magnetic body 4 will be described later.
  • FIG. 1 is also a perspective view showing the structure of the transformer (transformer device, three-phase transformer device) of the second embodiment, as described above.
  • the gap adjusting means 5 is not an essential element and is not shown in FIG.
  • the gap adjusting means 5 may be provided as shown in FIG.
  • FIG. 3 is a longitudinal sectional view showing the structure of the transformer (transformer device, three-phase transformer device) of the second embodiment.
  • the yoke iron cores 1a and 1b, the magnetic leg iron core 3, and the isotropic magnetic body 4 are the same as those described in FIG. 1, which is a perspective view, and are shown in a longitudinal section.
  • the primary coil 2 a is wound in the circumferential direction of the substantially cylindrical shape of the magnetic leg core 3. Further, a secondary coil 2b is wound around the circumference in the circumferential direction.
  • the primary coil 2a and the secondary coil 2b are comprised from the linear conductor provided with the insulating member, or a plate-shaped conductor.
  • the primary coil 2a serves as an exciting coil, and the exciting coil is particularly preferably configured as a linear conductor or a plate conductor provided with an insulating member.
  • a transformer transformer device, three-phase transformer device
  • FIG. 3 when a current is passed through the primary coil 2a, a current in the direction opposite to that of the primary coil 2a is induced in the secondary coil 2b in accordance with the magnitude of the load connected to the electrode of the coil. Since the action of canceling or weakening the magnetic flux in the leg iron core 3 appears, magnetic saturation hardly occurs. Therefore, it is not always necessary to provide the gap adjusting means (5, FIG. 2) in the magnetic leg core 3. That is, in FIG. 3, the magnetic leg iron core 3 does not have a gap adjusting means (5, FIG. 2), is formed into an integral substantially cylindrical shape, and is arranged so as to connect the yoke iron cores 1a and 1b.
  • a gap adjusting means (5, FIG. 1, FIG. 2) may be provided. Also in the case of FIG. 3, by providing the isotropic magnetic body 4 between the magnetic leg iron core 3 and the yoke iron cores 1a and 1b, generation of eddy current in the magnetic leg iron core 3 is suppressed, and eddy current loss is reduced. .
  • FIG. 4 is a diagram showing the definition of the structure, dimensions, magnetic flux characteristics, and coordinate system when the effect of the present embodiment is verified by the electromagnetic field calculation by the finite element method.
  • FIG. The figure which shows the structure of the connection part of the magnetic leg iron core 3, a dimension, and a coordinate system, (b) is a vector diagram of the magnetic flux B in the magnetic leg iron core 3 near a connection part, (c) is the yoke iron core 1a, and a magnetic leg iron core FIG.
  • a cylindrical coordinate system is defined in which the circumferential direction of the yoke core 1a is ⁇ , the radial direction is r, and the axial direction of the magnetic leg core 3 is z.
  • a disk-shaped isotropic magnetic body 4 having a thickness t and a diameter D is sandwiched between connecting portions of the yoke iron core 1a and the magnetic leg iron core 3. Yes.
  • the diameter of the disc-shaped isotropic magnetic body 4 and the magnetic leg iron core 3 are substantially the same, the thickness of the yoke iron core 1a is 0.4 times the diameter D of the disk-shaped isotropic magnetic body 4, and the width is It is substantially the same as the diameter D.
  • the diameter of the hollow portion inside the magnetic leg core 3 is 0.1 times the diameter D of the isotropic magnetic body 4. Note that the diameter (D) of the disk-shaped isotropic magnetic body 4 and the width (D) of the yoke iron core 1a are equal to the width of the yoke iron core 1a (that is, the diameter of the magnetic leg core 3 (that is, the disk-shaped isotropic magnetic body). This corresponds to the fact that the diameters of 4) almost overlap.
  • the magnetic flux B from the magnetic leg iron core 3 toward the yoke iron core 1a passes through the disk-shaped isotropic magnetic body 4 and follows the path shown by the arrow shown in FIG.
  • the path of the magnetic flux B indicated by the arrow causes a change in direction inside the magnetic leg iron core 3 near the yoke iron core 1a. That is, as shown in FIG. 4B, the magnetic flux B inside the magnetic leg core 3 in the vicinity of the yoke core 1a is affected by the change in its direction, and therefore has a ⁇ -direction component in addition to the z-direction component. Become.
  • the magnetic leg iron core 3 is formed by winding a ribbon-shaped magnetic material having the z direction in-plane in a substantially cylindrical shape, the ⁇ -direction component B ⁇ of the magnetic flux B penetrates the ribbon and generates eddy current loss. Cause.
  • the direction of the magnetic flux in the yoke core 1a is parallel to the ribbon surface, almost no eddy current loss occurs.
  • FIG. 4A since a hollow portion exists in the center of the magnetic leg iron core 3, it is closer to “cylindrical” than “columnar”, but ideally, it is desirable that there is no hollow portion. Darely written as “columnar”.
  • FIG. 5 shows the magnetic flux along the center line aa ′ in the ⁇ direction at the connection surface between the magnetic leg iron core 3 and the disk-shaped isotropic magnetic body 4 in the iron core of this embodiment having the structure and dimensions shown in FIG. 5 is a characteristic diagram obtained by calculating the distribution of absolute values
  • the horizontal axis represents the position on the center line aa ′ in the ⁇ direction on the connection surface of the magnetic leg core 3 and the disk-shaped isotropic magnetic body 4
  • the vertical axis represents the absolute value of the ⁇ direction component of the magnetic flux
  • T Tesla, Tesla, magnetic flux density
  • the diameter D of the disk-shaped isotropic magnetic body 4 shown in FIG. 4 is made constant, the thickness t of the disk-shaped isotropic magnetic body 4 is changed, and the disk-shaped isotropic magnetic body 4 exists.
  • t / D 0.08
  • t / D 0.16
  • t / D 0.25
  • t / D 0.29
  • t / D 0
  • the thickness t of the isotropic magnetic body 4 is gradually increased, and six calculation (simulation) results are shown with t / D as a parameter.
  • FIG. 6 shows a structure in which a magnetic leg core 3 around which a coil 2 is wound has a substantially fan shape in which a plurality of ribbon-like magnetic materials are laminated while being insulated in a third embodiment of the present invention.
  • FIG. 6 only one magnetic leg iron core 3 is shown, but three magnetic leg iron cores may be used as shown in FIG. FIG. 6 is different from FIG. 1 in that the magnetic leg iron core 3 has a substantially fan shape.
  • the substantially fan-shaped magnetic leg core 3 is formed, for example, by cutting a toroidal core 1c formed by laminating a thin strip-shaped magnetic material while being insulated and wound in a toroidal shape at an appropriate angle in the radial direction. Is done.
  • the magnetic leg iron core 3 in FIG. 6 is substantially fan-shaped, when the magnetic leg iron core 3 is composed of three pieces compared to the magnetic leg iron core 3 in FIG.
  • the occupied area efficiency of the magnetic leg iron core 3 in the center of the book is improved.
  • the magnetic leg iron core 3 is substantially fan-shaped, the lamination direction of the ribbon-like magnetic material of the yoke iron cores 1a and 1b and the magnetic leg iron core 3 is easily matched, and when the three-phase reactor device is obtained, It is characterized by a compact structure and low loss characteristics.
  • the connecting portion between the magnetic leg iron core 3 and the yoke iron cores 1a and 1b is substantially fan-shaped and has the same cross-sectional shape as the magnetic leg iron core 3.
  • a thin plate-shaped isotropic magnetic body 4 is provided. It should be noted that the laminating direction of the ribbon-like magnetic material of the magnetic leg core 3 is the same as the laminating direction of the yoke cores 1a and 1b, and it is desirable from the viewpoint of improving the electrical characteristics to be the radial direction.
  • 3rd Embodiment demonstrated as a reactor apparatus if the primary coil 2a (FIG. 3) and the secondary coil 2b (FIG.
  • the transformer which has the structure of the same magnetic leg iron core 3, or three A phase transformer can be configured.
  • the elements other than that the magnetic leg iron core 3 is substantially fan-shaped are, for example, approximately 120 degrees on the circumference of the yoke iron cores 1a and 1b and the yoke iron cores 1a and 1b, except for those described above. 6 and FIG. 1 are the same regarding the arrangement at the angle and the gap adjustment means 5, and a duplicate description will be omitted.
  • FIG. 7 shows a fourth embodiment of the present invention, in which the magnetic leg iron core 3 around which the coil 2 is wound has a substantially rectangular parallelepiped shape in which a plurality of ribbon-shaped magnetic materials 1d are laminated while being insulated. It is a figure which shows a structure. Although only one magnetic leg core 3 is shown in FIG. 7, three magnetic leg iron cores may be used as shown in FIG. FIG. 7 differs from FIGS. 1 and 6 in that the magnetic leg iron core 3 has a rectangular parallelepiped shape.
  • the substantially rectangular parallelepiped magnetic leg iron core 3 is formed, for example, by cutting a thin strip-shaped magnetic material 1d laminated while being insulated into a predetermined size.
  • the reactor device may be reduced in size, the number of steps in the manufacturing process may be reduced, and the manufacturing cost may be reduced.
  • the connecting portion between the magnetic leg iron core 3 and the yoke iron cores 1a and 1b has a substantially rectangular parallelepiped shape having the same cross-sectional shape as the magnetic leg iron core 3.
  • a thick thin plate-shaped isotropic magnetic body 4 is provided.
  • the laminating direction of the ribbon-like magnetic material of the magnetic leg core 3 is preferably the same as the laminating direction of the yoke cores 1a and 1b, and is preferably the radial direction.
  • 3rd Embodiment was demonstrated as a reactor, if the primary coil 2a (FIG. 3) and the secondary coil 2b (FIG.
  • the transformer which has the structure of the same magnetic leg iron core 3, or three A phase transformer can be configured. Since elements other than the magnetic leg iron core 3 having a substantially fan shape are the same as those shown in FIGS. 7 and 1 except for those described above, redundant description will be omitted.
  • FIG. 8 is a diagram illustrating the structure of the fixing device of the reactor device in the fifth embodiment of the present invention. Note that the first, third, and fourth embodiments described above can be applied to the reactor device itself other than the structure of the fixing device.
  • the reactor devices (1a, 1b, 2, 3, 4, 5) are mounted on a pedestal 7, covered with a fixing jig 6 from above, and fixed by pressure by fixing means 8a, 8b.
  • the pedestal 7 and the fixing jig 6 may be constituted by a plate-like member that completely covers the reactor device, or may be constituted by a frame-like member that does not completely cover the reactor device.
  • FIG. 8 shows an example of the reactor device (1a, 1b, 2, 3, 4, 5) in which a plurality of gap adjusting means 5 are provided in the magnetic leg core 3, but in this embodiment, The structural example of the fixing device shown can be applied to the transformer device according to the second embodiment shown in FIG. 3 with the same configuration.
  • FIG. 9 shows the configuration of the power converter according to the sixth embodiment of the present invention, and is a circuit diagram in which the reactor shown in the first embodiment and the third to fifth embodiments is applied to the power converter.
  • the circuit diagram shown in FIG. 9 shows a circuit configuration of a power converter as a three-phase uninterruptible power supply device of a constant inverter power supply system.
  • the power converter is provided between the AC power supply 13 and the load 14.
  • the power converter includes a rectifier circuit 11 that converts AC power of the AC power supply 13 into DC power, and an inverter circuit 12 that converts DC power into AC power having an arbitrary voltage and an arbitrary frequency.
  • a smoothing capacitor 22 and a chopper circuit 15 are connected between the output terminal of the rectifier circuit 11 and the input terminal of the inverter circuit 12.
  • the rectifier circuit 11 is an AC / DC in which a filter circuit 24 having a three-phase reactor 20 and a three-phase capacitor 21 and a plurality of IGBT (Insulated Gate Bipolar Transistor) switching elements 17 that are semiconductor elements are bridge-connected. And a conversion circuit 23 (bridge circuit).
  • the inverter circuit 12 includes a DC / AC conversion circuit 27 (bridge circuit) in which a plurality of IGBT switching elements 17 are bridge-connected, and a filter circuit 24 having a three-phase reactor 20 and a three-phase capacitor 21. Configured.
  • the switching elements 17 composed of a plurality of IGBTs in the AC / DC conversion circuit 23 and the DC / AC conversion circuit 27 are each subjected to PWM (Pulse Width Modulation) control in an integrated manner from the gate terminals, and each of the desired functions described above. Fulfill. Further, a diode for protecting overvoltage is added or parasitic to each of the IGBT switching elements 17 and connected in antiparallel.
  • PWM Pulse Width Modulation
  • the reactor according to any one of the first embodiment and the third to fifth embodiments is used for the three-phase reactor 20 included in the filter circuit 24 provided in the rectifier circuit 11 and the inverter circuit 12.
  • the chopper circuit 15 includes a switching element 25 including two IGBTs (25) connected in series, and is connected between both terminals of the smoothing capacitor 22.
  • One end of a coil or reactor 26 is connected to the connection point of the two switching elements 25, and the battery 16 is connected between the other end of the coil or reactor 26 and the emitter of one switching element 25.
  • bypass circuit 18 provided with a bypass converter circuit 19 is connected, and the AC power supply 13 is not connected via the rectifier circuit 11 or the inverter circuit 12. AC power is supplied to the load 14 via the bypass circuit 18. Note that how much function the bypass circuit 18 provided with the bypass converter circuit 19 has depends on the specifications of the power converter.
  • the rectifier circuit 11 has a function of an AC / DC conversion circuit that converts three-phase AC power into DC power
  • the inverter circuit 12 has three-phase AC power of an arbitrary voltage and an arbitrary frequency. It has a function of a DC / AC conversion circuit for converting to.
  • the rectifier circuit 11 and the inverter circuit 12 both operate a plurality of switching elements that perform PWM control. In the process of these switching operations, harmonic components (ripple components) are generated. Removal of these generated harmonic components and impedance between the AC power supply 13 and the AC / DC conversion circuit 23 constituting the bridge circuit, and between the load 14 and the DC / AC conversion circuit 27 constituting the bridge circuit.
  • a filter circuit 24 is used for matching.
  • the filter circuit 24 is configured by using the three-phase reactor 20 and the three-phase capacitor 21.
  • the reactor (device) according to any one of the first embodiment and the third to fifth embodiments of the present invention described above is used for the three-phase reactor 20.
  • a power converter that has excellent low loss characteristics and low manufacturing costs can be realized and provided.
  • the embodiment in which the isotropic magnetic body 4 is provided between the magnetic leg iron core and both the yoke iron core 1 a and the yoke iron core 1 b is shown. Even if the isotropic magnetic body 4 is provided only in one of the iron core 1a side or the yoke iron core 1b side alone, it is effective in reducing eddy current loss.
  • the magnetic leg iron core 3 shown in the embodiment of FIGS. 1, 6, and 7 is an example of a cylindrical shape, a fan shape, and a rectangular parallelepiped shape formed by laminating thin ribbon magnetic materials. You may comprise a reactor apparatus by arbitrary combinations of a magnetic leg iron core.
  • FIG. 6 showing the third embodiment, as a method of forming the magnetic leg iron core 3 having a substantially sector shape, “a steel core formed by winding a ribbon-like magnetic material in a toroidal shape while applying insulation is appropriately used. “It cuts in the radial direction at a certain angle”, but other methods may be used as long as the substantially fan-shaped shape shown in FIG. 6 is obtained.
  • the third embodiment that is, the effect that the magnetic leg iron core 3 of the reactor is substantially fan-shaped is described, but this effect is also the same as the magnetic leg iron core of the transformer.
  • the three-phase reactor device of FIG. 1 shows only three magnetic legs, a zero-phase magnetic leg as a path for flowing a magnetic flux due to zero-phase impedance between each of the three magnetic legs. Even in a three-phase reactor device provided with an iron core (not shown), providing an isotropic magnetic body between the magnetic leg iron core and the yoke iron core is effective in reducing eddy current loss.
  • the reactor device of FIG. 1 shows three magnetic legs for three-phase use, it is not limited to three-phase, and when it exceeds three phases (for example, five phases), a plurality of more than three Even in a reactor device having a magnetic leg, providing an isotropic magnetic body between the magnetic leg iron core and the yoke iron core is effective in reducing eddy current loss.
  • the switching element 17 of the semiconductor element constituting the AC / DC conversion circuit 23 and the DC / AC conversion circuit 27 in the power converter shown in FIG. 9 is an IGBT, it is not limited to an IGBT. You may comprise by MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) which is a switching element of a semiconductor element, a bipolar transistor (Bipolar junction transistor), and BiCMOS (Bipolar Complementary Metal Oxide Semiconductor).
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • BiCMOS Bipolar Complementary Metal Oxide Semiconductor
  • FIG. 9 As an application of the reactor device of the embodiment of the present invention, an example of an uninterruptible power supply device is shown in FIG. 9, but the present invention is not limited to this.
  • the reactor device of the present invention in the filter circuit of the power converter for other applications using the bridge circuit, it is possible to provide a low-loss power converter.
  • FIG. 10 is a reference diagram showing an outline of a longitudinal section of the structure of a conventional reactor (reactor device).
  • a reactor device is constituted by the yoke iron core 31, the magnetic leg iron core 30, the gap adjusting means 32, and the coil 2.
  • the magnetic leg iron core 30 and the yoke iron core 31 are connected directly or via a gap. Accordingly, the magnetic flux generated by the current flowing through the coil 2 is in the vertical direction in the magnetic leg core 30 but in the horizontal direction in the yoke core 31, so that the vicinity of the connection portion between the magnetic leg iron core 30 and the yoke iron core 31.
  • a horizontal direction magnetic flux is generated in addition to the vertical direction magnetic flux, eddy current flows in the circumferential direction of the magnetic leg iron core 3, and the loss as a reactor increases. That is, in the structure of the conventional reactor (reactor device) shown in FIG. 10, loss due to generation of eddy current was large.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Dc-Dc Converters (AREA)
PCT/JP2011/075021 2011-10-31 2011-10-31 リアクトル、変圧器およびこれを用いた電力変換器 WO2013065095A1 (ja)

Priority Applications (5)

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US14/354,107 US20140292455A1 (en) 2011-10-31 2011-10-31 Reactor, Transformer, and Power Conversion Apparatus Using Same
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