WO2022044803A1 - 電力変換装置 - Google Patents

電力変換装置 Download PDF

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Publication number
WO2022044803A1
WO2022044803A1 PCT/JP2021/029607 JP2021029607W WO2022044803A1 WO 2022044803 A1 WO2022044803 A1 WO 2022044803A1 JP 2021029607 W JP2021029607 W JP 2021029607W WO 2022044803 A1 WO2022044803 A1 WO 2022044803A1
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WO
WIPO (PCT)
Prior art keywords
winding
core
leg
reactor
magnetic flux
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.)
Ceased
Application number
PCT/JP2021/029607
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English (en)
French (fr)
Japanese (ja)
Inventor
智仁 福田
隆 熊谷
数章 福井
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
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Priority to JP2022545629A priority Critical patent/JPWO2022044803A1/ja
Priority to US18/006,207 priority patent/US20230260691A1/en
Publication of WO2022044803A1 publication Critical patent/WO2022044803A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F27/255—Magnetic cores made from particles
    • 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F2027/348—Preventing eddy currents
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel

Definitions

  • This disclosure relates to a power conversion device.
  • the reactor is provided with a core gap in the core made of soft magnetic material.
  • the normal mode inductance can be reduced by increasing the core gap length. However, if the core gap length exceeds a certain level, increasing the core gap length does not contribute to the reduction of the normal mode inductance. Therefore, there is a problem that the normal mode inductance cannot be adjusted to a desired value with high accuracy.
  • common mode noise which is subject to EMI (Electro-Magnetic Interference) regulation
  • EMI Electro-Magnetic Interference
  • common mode inductance the inductance of the reactor effective for removing noise and reducing current ripple when a common mode current flows.
  • Patent Document 1 discloses a reactor having both a normal mode inductance and a common mode inductance.
  • the reactor described in Japanese Patent No. 5790700 provides one or two core gaps for each closed magnetic path. However, it is not possible to achieve high accuracy of inductance only by providing one or two core gaps.
  • the winding is heated by the induction heating of the winding due to the leakage flux of the core gap portion, which causes a problem that the coil becomes large.
  • the power conversion device of the present disclosure is for solving the above-mentioned problems, and an object thereof is to mitigate the influence of induction heating of the winding due to the leakage flux of the core gap portion and to reduce the size of the coil. It is to provide a power conversion device that incorporates a reactor that can be used.
  • the power conversion device includes a core, a first conductive member, and a second conductive member.
  • the core includes a first member and a second member arranged apart from each other, and a first leg portion, a second leg portion, and a third leg portion, each of which connects the first member and the second member.
  • the first leg is arranged between the second leg and the third leg.
  • the first conductive member includes a first winding wound around the first leg and a second winding connected in series with the first winding and wound around the second leg.
  • the second conductive member includes a third winding wound around the first leg and a fourth winding connected in series with the third winding and wound around the third leg.
  • the first leg portion is composed of a first core member made of a soft magnetic material and provided with a plurality of gaps, and a plurality of members each made of a non-magnetic material and arranged in a plurality of gaps of the first core member. Includes a first gap member.
  • the influence of the induction heating of the winding due to the leakage flux of the core gap portion of the reactor can be alleviated, and the coil can be miniaturized.
  • FIG. It is a circuit diagram which shows the structure of the power conversion apparatus 1 of Embodiment 1.
  • FIG. It is a schematic perspective view which shows the appearance of the power conversion apparatus 1 of Embodiment 1.
  • FIG. It is sectional drawing of the core 300 constituting the reactor 100.
  • It is a winding diagram of the reactor 100.
  • It is a partial cross-sectional view of a winding shown by enlarging the periphery of a gap member.
  • It is a figure which shows the magnetic flux when the common mode current flows through the reactor 100.
  • FIG. 1 It is a figure which shows the magnetic flux when the normal mode current flows through the reactor 103. It is a figure which shows the magnetic flux when the common mode current flows through the reactor 103. It is a circuit diagram which shows the main circuit composition of the power conversion apparatus which concerns on Embodiment 3.
  • FIG. It is a winding diagram of the reactor 104. It is a figure which shows the magnetic flux when the normal mode current flows through the reactor 104. It is a figure which shows the magnetic flux when the common mode current flows through the reactor 104. It is sectional drawing of the core 312 which concerns on Embodiment 4. FIG. It is sectional drawing of the core 321 which concerns on Embodiment 5.
  • FIG. 1 is a circuit diagram showing the configuration of the power conversion device 1 of the first embodiment.
  • FIG. 2 is a schematic perspective view showing the appearance of the power conversion device 1 of the first embodiment. That is, FIG. 2 shows the completed circuit diagram of FIG. 1 assembled with each member.
  • the reactor 100 mounted on the power conversion device 1 of the first embodiment will be described with reference to FIGS. 1 and 2.
  • the power conversion device 1 includes input terminals 10 and 11, smoothing capacitors 20 to 22, a switching circuit 30, a reactor 100, and output terminals 12 and 13.
  • Input terminals 10 to 11 receive DC voltage.
  • the smoothing capacitor 20 stabilizes the received DC voltage.
  • the switching circuit 30 is composed of semiconductor elements 31 to 34. The switching circuit 30 switches and converts the DC voltage.
  • the reactor 100 and the smoothing capacitors 21-22 stabilize the converted DC voltage.
  • the output terminals 12 to 13 supply the converted DC voltage to the outside of the power conversion device 1 as a power supply voltage.
  • the reactor 100 has a function of converting the voltage of the input terminals 10 to 11 and smoothing the output terminals 12 to 13 so as to output a direct current.
  • a normal mode inductance 101 is required for this smoothing.
  • One end of the smoothing capacitors 21 and 22 may be connected to the ground terminal 14 due to EMI regulations or safety standards.
  • a high frequency is generated from the terminals B and C of the reactor 100 to the grounded portion of the input terminal 11 and the grounded portion of the input circuit in the previous stage of the input terminals 10 and 11 via the smoothing capacitors 21 and 22 and the grounded terminal 14. There is a path for current to be energized.
  • the reactor 100 is required to have a common mode inductance 102.
  • the semiconductor elements 31 to 34 are switched at a frequency of about 50 Hz to 5 MHz.
  • the reactor 100 has a common mode inductance 102 so as not to cause a malfunction of the output destination device due to the propagation of the switching noise to the output terminals 12 to 13 and a malfunction of the peripheral device due to the radiated electromagnetic wave radiated in the space. Is required.
  • the reactor 100 of the present embodiment has both the normal mode inductance 101 and the common mode inductance 102, and each inductance value can be set with high accuracy and in a wide range.
  • the influence of the induction heating of the winding due to the leakage flux of the core gap portion can be alleviated, and the coil can be miniaturized.
  • FIG. 3 is a cross-sectional view of the core 300 constituting the reactor 100.
  • FIG. 4 is a winding diagram of the reactor 100. The configuration of the reactor 100 will be described with reference to FIGS. 3 to 4.
  • the core 300 includes a first member 301, a second member 302, core pieces 303 to 311 and gap members 400 to 411, which are divided into small pieces.
  • the materials constituting the first member 301, the second member 302, and the core pieces 303 to 311 are, for example, pure iron, Fe—Si alloy, Fe—Si—Al alloy, Ni—Fe alloy, and Ni—Fe—Mo alloy. It is a soft magnetic material such as a dust core, an Mn—Zn-based or Ni—Zn-based ferrite core, an amorphous core, and a nanocrystal core.
  • powder resin or the like may be coated on each of the first member 301, the second member 302, and the core pieces 303 to 311.
  • dust cores and ferrite cores are heat-treated after forming a powdery material with a press.
  • the first member 301, the second member 302, and the core pieces 303 to 311 shown in the first embodiment are combined with the cores divided into small pieces to form a large core 300. Therefore, the first member 301, the second member 302, and the core pieces 303 to 311 are easy to manufacture, the manufacturing cost can be reduced, the variation during manufacturing is reduced, and the quality is improved.
  • Amorphous cores and nanocrystal cores can be considered as other materials. These cores are heat treated after stacking thin strips of material. Similar to the dust core and the ferrite core, these also shrink during the heat treatment, so the same effect as described above can be obtained by dividing them into small pieces.
  • the material constituting the gap members 400 to 411 is a non-magnetic material.
  • a resin such as polypropylene (PP), ABS, polyethylene terephthalate (PET), polycarbonate (PC), fluorine, phenol, melamine, polyurethane, epoxy, silicon, or kraft pulp, aramid, fiber, insulating paper, etc. is used as a gap member 400. It can be used as a material of ⁇ 411.
  • the relative permeability is relatively small, about 26 to 150. Therefore, the length of the core gap may be determined to be about 0.1 to 20 mm, and the thickness of the gap members 400 to 411 may be determined according to the length of the core gap. Further, for example, in the case of a ferrite core, the relative magnetic permeability is relatively large at 1500 to 4000. Therefore, the length of the core gap in the case of the ferrite core is about 0.1 to 40 mm, which is longer than that in the case of the dust core. The larger the number of divided core pieces 303 to 311 and the larger the number of core gaps, the shorter the length of the core gaps per location. The shorter the core gap length, the smaller the magnetic flux that leaks. Therefore, the eddy current loss of the windings 201 to 204 generated by the magnetic flux leaking from the core gap interlinking the windings 201 to 204 can be reduced.
  • the gap members 400 to 411 may be fixed by applying an adhesive to a part or all of the surfaces of the first member 301, the second member 302, and the core pieces 303 to 311.
  • an adhesive may be applied to a part or all the surfaces of the gap members 400 to 411 and attached to the first member 301, the second member 302, and the core pieces 303 to 311.
  • Windings 201 to 204 are wound around the core 300 described with reference to FIG. Since the current flows, the windings 201 to 204 are made of copper or aluminum having a low electrical resistivity. In order to prevent a short circuit with adjacent windings, the windings 201 to 204 are preferably a conductive wire having an insulating coating or a conductive wire wrapped with insulating paper. To prevent short circuits between adjacent coils, the thickness of the coating or coating may be about 0.001 to 2 mm without any problem. These windings 201-204 are wound so as to cover one or more gap members.
  • FIG. 5 is a partial cross-sectional view of the winding shown by enlarging the periphery of the gap member. Since there are a plurality of gap members and the length of the core gap per location is short, the magnetic flux leaking from the core gap portion is small. Therefore, the eddy current loss of the windings 201 to 204 generated by the magnetic flux leaking from the core gap interlinking with the windings 201 to 204 can be reduced, and the temperature rise portion is dispersed, so that the winding can be miniaturized.
  • the winding when the winding is arranged so as to cover the core gap as shown in FIG. 5, magnetic flux flows along the winding surface which is a conductor. Therefore, the magnetic flux leaking from the core gap can be shielded by the winding, and the magnetic flux leakage to the outside of the reactor 100 can be reduced.
  • the winding method of the winding will be described again with reference to FIGS. 3 and 4.
  • the windings 201 and 203 are wound around the core pieces 306 to 308 constituting the first leg portion 131 (middle leg) of the core 300 from the first member 301 side toward the second member 302. At this time, the windings 201 and 203 are wound clockwise when the first leg portion 131 is viewed from the upper surface of the reactor, that is, the first member 301 side.
  • the winding 202 is wound around the core pieces 303 to 305 constituting the second leg portion 132 (left leg) of the core 300 from the first member 301 side toward the second member 302. At this time, the winding 202 is wound counterclockwise with the first leg 131 viewed from the upper surface of the reactor, that is, the first member 301 side.
  • the winding 204 is wound around the core pieces 309 to 311 constituting the third leg portion 133 (right leg) of the core 300 from the first member 301 side toward the second member 302. At this time, the winding 202 is wound clockwise when the first leg 131 is viewed from the upper surface of the reactor, that is, the first member 301 side.
  • winding 202 and one end of winding 201 are directly connected.
  • One end of winding 204 and one end of winding 203 are also directly connected.
  • the winding 202 and the winding 204 are wound the same number of turns. If the number of turns is the same, the magnetic flux densities that cancel each other out, which will be described later, are the same, which is preferable.
  • Winding 201 and winding 203 are wound several times in the same turn. If the number of turns is the same, the magnetic flux densities that cancel each other out, which will be described later, are the same, which is preferable.
  • FIG. 6 is a diagram showing a magnetic flux when a normal mode current flows through the reactor 100.
  • FIG. 7 is a diagram showing a magnetic flux when a common mode current flows through the reactor 100. The behavior of the magnetic circuit in each current mode will be described with reference to FIGS. 6 to 7.
  • the terminals A and D of the reactor 103 are connected to the switching circuit 30.
  • the terminal B of the reactor 103 is connected to the smoothing capacitor 21 and the output terminal 12.
  • the terminal C of the reactor 103 is connected to the smoothing capacitor 22 and the output terminal 13.
  • FIG. 6 will be used to explain the behavior of the magnetic circuit when a normal mode current flows.
  • the current 500 flows from the terminal A of the winding 202, and the current 501 flows from the terminal C of the winding 204.
  • magnetic fluxes of 600 to 605 are generated according to Ampere's law.
  • the magnetic flux 604 generated by the winding 203 and the magnetic flux 605 generated by the winding 201 have the same magnitude and opposite magnetic flux densities. Since the magnetic flux 604 and the magnetic flux 605 pass through the same core cross section, they cancel each other out. Therefore, the first leg 131 and the windings 203 and 201 do not contribute as the normal mode inductance of the reactor 100.
  • the normal mode inductance at this time is determined by the magnetic flux 600 to 603, the number of turns of the winding 202 and the winding 204, and the thickness of the gap members 400 to 403 and 408 to 411.
  • FIG. 7 will be used to explain the behavior of the magnetic circuit when a common mode current flows.
  • the current 502 flows from the terminal A of the winding 202, and the current 503 flows from the terminal D of the winding 203.
  • magnetic fluxes 606 to 618 are generated according to Ampere's law.
  • the magnetic fluxes 606 to 607 generated by the winding 202 and the magnetic fluxes 608 to 609 generated by the winding 204 have the same magnetic flux density if the number of turns of the winding 202 and the winding 204 are the same. .. These magnetic fluxes cancel each other out because they pass through the same core cross section in the second leg portion 132 and the third leg portion 133. Therefore, the winding 202 and the winding 204 do not contribute as a common mode inductance.
  • the magnetic fluxes cancel each other out, so that the contribution of the winding 202 and the winding 204 to the common mode inductance can be reduced.
  • the inductance obtained by combining the inductance of the path of the magnetic flux 614 ⁇ 615 ⁇ 611 ⁇ 612 ⁇ 613 due to the winding 201 and the inductance of the path of the magnetic flux 617 ⁇ 618 ⁇ 611 ⁇ 612 ⁇ 616 due to the winding 203 is the common mode. It becomes an inductance.
  • the common mode inductance at this time is roughly determined by the magnetic fluxes 611 to 618, the number of turns of the winding 201 and the winding 203, and the thickness of the gap members 400 to 411.
  • the thicknesses of the gap members 400 to 403 of the second leg portion 132 and the gap members 408 to 411 of the third leg portion 133 are reduced, and the thickness of the first leg portion 131 is reduced.
  • the thickness of the gap members 404 to 407 is increased. This makes it possible to approach the required normal mode inductance and common mode inductance, respectively.
  • the desired normal mode inductance and common mode inductance can be realized with one reactor 100, and it is not necessary to mount two types of normal mode reactor and common mode reactor, and the power conversion device can be downsized. You can expect it.
  • Inductance in addition to adjusting the number of turns of the winding 202 and winding 204 arranged on the left leg and the right leg of the core, the thickness of the gap members 400 to 403 and 408 to 411 is adjusted. , Inductance can be configured with high accuracy and over a wide range.
  • the inductance after adjusting the normal mode inductance, the inductance can be made highly accurate by adjusting the number of turns of the winding 201 and winding 203 and the thickness of the gap members 404 to 407 of the core middle leg. And it can be configured in a wide range.
  • the core gap length per location can be shortened, and the inductance can be reduced as in the general theoretical formula. It becomes.
  • the core gap length per location can be shortened, the effect of induction heating of the winding due to the leakage flux of the core can be mitigated, and the winding due to low loss can be mitigated. Can be miniaturized.
  • the configuration including a plurality of gap members has been described, but the desired normal mode inductance and common mode inductance can be obtained by adjusting only the winding method and the number of turns without using the gap members. Can be configured.
  • FIG. 8 is a circuit diagram showing a main circuit configuration of the power conversion device according to the second embodiment.
  • the power conversion device according to the second embodiment includes a reactor 103 instead of the reactor 100 in the configuration of the power conversion device according to the first embodiment. Since the description of each circuit component having the same reference numeral is the same as that of the first embodiment, the description will not be repeated.
  • FIG. 9 is a diagram showing a magnetic flux when a normal mode current flows through the reactor 103.
  • FIG. 10 is a diagram showing a magnetic flux when a common mode current flows through the reactor 103.
  • the reactor 103 according to the second embodiment will be described with reference to FIGS. 9 and 10.
  • the reactor 103 is the same as the reactor 100 described in the first embodiment in the configuration of the core 300 and the winding method around the windings 201 to 204.
  • the reactor 103 differs from the reactor 100 of the first embodiment in that it is connected to the switching circuit 30 and the output terminal as follows.
  • the terminals A and D of the reactor 103 are connected to the switching circuit 30.
  • the terminal B of the reactor 103 is connected to the smoothing capacitor 21 and the output terminal 12.
  • the terminal C of the reactor 103 is connected to the smoothing capacitor 22 and the output terminal 13.
  • FIG. 9 will be used to explain the behavior of the magnetic circuit when a normal mode current flows.
  • the current 504 flows from the terminal A of the winding 202
  • the current 505 flows from the terminal D of the winding 203.
  • magnetic fluxes 619 to 631 are generated according to Ampere's law.
  • the magnetic fluxes 619 to 621 generated by the winding 202 and the magnetic fluxes 622 to 623 and 627 formed by the winding 204 have the same magnitude as long as the number of turns of the winding 202 and the winding 204 is the same. Now the magnetic flux density is in the opposite direction. Since these magnetic fluxes pass through the cross section of the same core in the second leg portion 132 and the third leg portion 133, they cancel each other's magnetic fluxes and do not contribute as a normal mode inductance.
  • the combined inductance of the inductance in the path of the magnetic flux 624 ⁇ 625 ⁇ 626 ⁇ 630 ⁇ 631 due to the winding 201 and the inductance in the path of the magnetic flux 627 ⁇ 628 ⁇ 629 ⁇ 630 ⁇ 631 due to the winding 203 is the normal mode. It becomes an inductance.
  • the normal mode inductance at this time is roughly determined by the magnetic fluxes 624 to 631, the number of turns of the windings 201 and 203, and the thickness of the gap members 400 to 411.
  • FIG. 10 will be used to explain the behavior of the magnetic circuit when a common mode current flows.
  • the current 506 flows from the terminal A of the winding 202, and the current 507 flows from the terminal C of the winding 204.
  • magnetic fluxes 632 to 637 are generated according to Ampere's law.
  • the magnetic flux 636 generated by the winding 203 and the magnetic flux 637 generated by the winding 201 have the same magnitude and opposite magnetic flux densities. Since the magnetic flux 636 and the magnetic flux 637 pass through the same core cross section, they cancel each other out. Therefore, the first leg 131 of the core and the windings 203 and 201 do not contribute as the normal mode inductance of the reactor 103.
  • the normal mode inductance at this time is determined by the magnetic fluxes 632 to 635, the number of turns of the windings 202 and 204, and the thicknesses of the gap members 400 to 403 and 408 to 411.
  • each inductance with high accuracy and in a wide range, depending on the winding connection method, number of turns, thickness and number of gap members, etc., according to the accuracy required for the circuit to be applied and the inductance.
  • FIG. 11 is a circuit diagram showing a main circuit configuration of the power conversion device according to the third embodiment.
  • the power conversion device according to the third embodiment includes a reactor 104 instead of the reactor 100 in the configuration of the power conversion device according to the first embodiment. Since the description of each circuit component having the same reference numeral is the same as that of the first embodiment, the description will not be repeated.
  • FIG. 12 is a winding diagram of the reactor 104.
  • the reactor 104 according to the third embodiment will be described with reference to FIG. Since the configuration of the core 300 is the same as that of the first and second embodiments, the description will not be repeated.
  • Windings 205 to 208 are wound from the first member 301 side toward the second member 302. At this time, all the windings 205 to 208 are wound counterclockwise when the first leg 131 is viewed from the upper part of the reactor, that is, the first member 301 side.
  • Winding 206 and winding 208 are wound so that the number of turns is the same. Similarly, the winding 205 and the winding 207 are also wound so as to have the same number of turns.
  • the terminal B of the winding 206 and the terminal C of the winding 205 are processed so that a conductor 700 such as copper or aluminum can be connected.
  • the terminal F of the winding 207 and the terminal G of the winding 208 are processed so that a conductor 701 such as copper or aluminum can be connected.
  • a large winding is formed by manually winding a straight conductor along a mold.
  • a large winding is formed by winding a straight conductor along a mold.
  • the windings 206 and 208 have the same winding shape. Further, the windings 205 and 207 have the same winding shape. Therefore, since the number of types of parts can be reduced, it can be manufactured at low cost, and it is possible to prevent erroneous assembly and obtain effects such as quality improvement.
  • the conductors 700 to 701 are connected to the windings 205 to 208 to form the reactor 100.
  • FIG. 13 is a diagram showing a magnetic flux when a normal mode current flows through the reactor 104. With reference to FIG. 13, the behavior of the magnetic circuit when a normal mode current flows will be described.
  • the current 508 flows from the winding 206 terminal A, and the current 509 flows from the terminal E of the winding 207. Since the magnetic flux generation state of the core 300 is the same as that of the magnetic flux generation state at the time of the normal mode current of the first embodiment described with reference to FIG. 6, the description is not repeated.
  • FIG. 14 is a diagram showing a magnetic flux when a common mode current flows through the reactor 104. With reference to FIG. 14, the behavior of the magnetic circuit when a common mode current flows will be described.
  • the current 510 flows from the winding 206 terminal A, and the current 511 flows from the terminal H of the winding 208. Since the magnetic flux generation state of the core 300 is the same as that of the magnetic flux generation state at the time of the common mode current of the first embodiment described with reference to FIG. 7, the description will not be repeated.
  • Embodiments 1 and 2 are made by connecting the terminals of the winding with conductors 700 and 701 while making the winding direction and the number of windings the same as in the present embodiment and facilitating the manufacture of the winding. The same effect as can be obtained.
  • FIG. 15 is a cross-sectional view of the core 312 according to the fourth embodiment.
  • the core 312 is a first leg portion 131A, a second leg portion 132A, and a third leg that connect the first member 301A and the second member 302A arranged apart from each other and the first member 301A and the second member 302A, respectively. Includes parts 133A.
  • the first member 301A and the second member 302A of the core 312 include core pieces 313 and 314 having an E-shaped cross section, respectively.
  • the cross section of the core pieces 313 to 314 is E-shaped.
  • the leakage flux is reduced.
  • the windings of the first to third embodiments are wound around the core 312 to form a reactor. Since the leakage flux leaking from the core gap is reduced, the eddy current loss of the winding generated by the leakage flux interlinking the winding can be reduced, and the winding can be miniaturized.
  • FIG. 16 is a cross-sectional view of the core 321 according to the fifth embodiment.
  • the core 321 has a first leg portion 131B, a second leg portion 132B, and a third leg that connect the first member 301B and the second member 302B arranged apart from each other and the first member 301B and the second member 302B, respectively. Includes parts 133B.
  • the first member 301B of the core 321 includes two core pieces 315,317, and the second member 302B contains two core pieces 316,318.
  • Each cross section of the core pieces 315 to 318 has a U-shaped shape.
  • the core piece 315 and the core piece 316 are arranged so as to face each other, and a hollow rectangular core 319 is configured.
  • the core piece 317 and the core piece 318 are arranged so as to face each other, and a hollow rectangular core 320 is formed.
  • a gap member 412 is inserted between the core 319 and the core 320 to form the core 321.
  • the core pieces 315 to 318 having a U-shaped cross section can be made smaller and easier to manufacture than the first members 301, 301A and the second members 302, 302A used in the first to fourth embodiments. As a result, the manufacturing cost can be further reduced, the variation during manufacturing is reduced, and the quality is improved.
  • the thickness of the gap members 400 to 411 inserted between the first member 301, the second member 302, and the core pieces 303 to 311 determines the normal mode inductance and the common mode inductance. It is possible to provide a power conversion device incorporating a configurable reactor with high accuracy and in a wide range.
  • the core pieces are divided into small pieces during production, the effects of press pressure during production and shrinkage after heat treatment can be reduced, the divided cores can be easily manufactured, and the manufacturing cost can be reduced. There is less variation and quality is improved.
  • the number of core gaps can be increased, the length of each core gap can be shortened, the eddy current loss of the winding due to the magnetic flux leaking from the core gap can be reduced, and the winding can be miniaturized. can do.
  • the power conversion device of the present disclosure includes a reactor 100 including a core 300, a first conductive member 121, and a second conductive member 122.
  • the core 300 includes a first member 301 and a second member 302 arranged apart from each other, and a first leg portion 131, a second leg portion 132, and a third leg, each of which connects the first member 301 and the second member 302. Including unit 133.
  • the first leg portion 131 is arranged between the second leg portion 132 and the third leg portion 133.
  • the first conductive member 121 has a first winding 201 wound around the first leg 131 and a second winding 202 connected in series with the first winding 201 and wound around the second leg 132. including.
  • the second conductive member 122 has a third winding 203 wound around the first leg portion and a fourth winding 204 connected in series with the third winding 203 and wound around the third leg portion 133.
  • the first leg portion 131 is made of a soft magnetic material, has a plurality of gaps, and is composed of a first core member made of core pieces 306, 307, 308 and a non-magnetic material, respectively, of the first core member. It includes a plurality of first gap members 404, 405, 406, 407 respectively arranged in the plurality of gaps.
  • the core gap length per place is shortened.
  • the influence of the induction heating of the winding due to the leakage flux of the core can be mitigated, and the winding can be miniaturized by reducing the loss.
  • the second leg 132 is made of a soft magnetic material, has a plurality of gaps, and has a second core member composed of core pieces 303, 304, 305, each of which is non-magnetic. It includes a plurality of second gap members 400, 401, 402, 403 which are composed of a body and are respectively arranged in a plurality of gaps of the second core member.
  • the third leg is made of a soft magnetic material, has a plurality of gaps, and is composed of a third core member made of core pieces 309, 310, 311 and a non-magnetic material, respectively, and a plurality of third core members. Includes a plurality of third gap members 408, 409, 410, 411, respectively, which are arranged in the gaps of.
  • At least a portion of the first winding 201 and the third winding 203 is wound so as to cover at least one of the plurality of first gap members 404, 405, 406, 407. Will be done.
  • the magnetic flux leaking from the core gap can be shielded by the winding, and the magnetic flux leakage to the outside of the reactor can be reduced.
  • the magnetic flux 605 and the third winding 203 generated by the first winding 201 are generated.
  • the first winding 201 and the third winding 203 are respectively wound so as to cancel each other out with the magnetic flux 604 generated by.
  • the normal mode currents 500 and 501 flow through the first conductive member 121 and the second conductive member 122, the direction of the magnetic flux 605 generated by the first winding 201 and the magnetic flux 604 generated by the third winding 203.
  • the first winding 201 and the third winding 203 are respectively wound so that the directions are opposite to each other.
  • the normal mode currents 500 and 501 flow through the first conductive member 121 and the second conductive member 122, the direction of the magnetic flux 605 generated by the first winding 201 and the magnetic flux 604 generated by the third winding 203.
  • the first winding 201 and the third winding 203 are respectively wound so that the directions of the first winding 201 and the third winding 203 cancel each other out.
  • the number of turns in which the first winding 201 is wound around the first leg 131 and the number of turns in which the third winding 203 is wound around the first leg 131 are preferable. It is the same as the number. It is preferable that the number of turns is the same, but the number of turns may be slightly different.
  • the normal mode inductance can be determined by the number of turns of the second winding 202 and the fourth winding 204.
  • the first member 301A and the second member 302A each include a core piece 313, 314 having an E-shaped cross section.
  • the core gap in the corner part disappears. Therefore, the leakage flux leaking from the core gap can be reduced, the eddy current loss of the winding generated by the leakage flux interlinking the winding can be reduced, and the winding can be miniaturized.
  • the first member 301B includes a first core piece 315 with a U-shaped cross section and a second core piece 317 with a U-shaped cross section
  • the second member 302B is a second member with a U-shaped cross section. It includes one core piece 316 and a second core piece 318 with a U-shaped cross section.
  • the number of core pieces and the number of gap members constituting the cores 300, 312, 315, and 321 are intended to be within the scope of the claims even if they are not the numbers shown in the embodiments of the present specification.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)
  • Coils Of Transformers For General Uses (AREA)
PCT/JP2021/029607 2020-08-28 2021-08-11 電力変換装置 Ceased WO2022044803A1 (ja)

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EP4489042A4 (en) * 2022-03-04 2026-03-18 Omron Tateisi Electronics Co JUNCTION INDUCTOR AND CIRCUIT

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