JP2020047648A - Power conversion apparatus, reactor device and heat dissipation structure - Google Patents

Abstract

To provide a power conversion apparatus with a small area occupied by a reactor, reactor device and heat dissipation structure.SOLUTION: A power conversion section 2 is provided with a reactor 4. The reactor 4 includes an annular core 41. The power conversion section 2 converts input power for output. A heat transfer member 5 comes into contact with the reactor 4 in the axial direction of the core 41 or aligns with the reactor 4 in the axial direction, sandwiching a member with a higher heat conductivity than air (a sheet 82 and a mounting member 81) between itself and the reactor 4. A heat sink 6 has an opposing face 611 opposing to the heat transfer member 5. The heat sink 6 is mounted on the heat transfer member 5. The reactor 4 is arranged so that the axial direction runs along the opposing face 611.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a power conversion device, a reactor device, and a heat dissipation structure, and more specifically, a power conversion device including a reactor including an annular core, a reactor device including the reactor and used in the power conversion device, and a reactor including the reactor. A fixed heat dissipation structure.

  A power conversion device described in Patent Document 1 is illustrated as a conventional example. The power conversion device described in Patent Literature 1 includes a reactor and a cooling unit (heat sink). In the power conversion device described in Patent Literature 1, a reactor in which a coil material is wound around a cylindrical core is arranged such that one end surface in the axial direction faces a cooling surface (opposing surface) of a cooling unit via a gap. Have been placed.

JP-A-2017-034012

  2. Description of the Related Art Conventionally, in order to meet a demand for downsizing of a power converter, it has been required to reduce an area occupied by a reactor in the power converter.

  An object of the present disclosure is to provide a power conversion device, a reactor device, and a heat dissipation structure in which the area occupied by the reactor is small.

  A power conversion device according to an aspect of the present disclosure includes a power conversion unit, a heat transfer member, and a heat sink. The power conversion unit has a reactor. The reactor includes an annular core. The power converter converts the input power and outputs the converted power. The heat transfer member is in contact with the reactor in the axial direction of the core, or is arranged with the reactor in the axial direction with a member having a higher thermal conductivity than air between the reactor and the reactor. The heat sink has a facing surface facing the heat transfer member. The heat sink is attached to the heat transfer member. The reactor is arranged so that the axial direction is along the facing surface.

  A reactor device according to an aspect of the present disclosure includes a reactor, a heat transfer member, and a heat sink. The reactor includes an annular core. The heat transfer member is in contact with the reactor in the axial direction of the core, or is arranged with the reactor in the axial direction with a member having a higher thermal conductivity than air between the reactor and the reactor. The heat sink has a facing surface facing the heat transfer member. The heat sink is attached to the heat transfer member. The reactor is arranged so that the axial direction is along the facing surface.

  A heat dissipation structure according to an embodiment of the present disclosure includes a heat transfer member and a heat sink. The heat transfer member is in contact with a reactor including an annular core in the axial direction of the core, or the reactor in the axial direction with a member having a higher thermal conductivity than air between the reactor and the reactor. Line up with. The heat sink has a facing surface facing the heat transfer member. The heat sink is attached to the heat transfer member. The reactor is fixed to at least one of the heat transfer member and the heat sink such that the axial direction is along the facing surface.

  According to the power converter, the reactor, and the heat dissipation structure according to an embodiment of the present disclosure, the area occupied by the reactor in the power converter, the reactor, and the heat dissipation structure may be reduced.

FIG. 1A is a cross-sectional view of the power converter according to the first embodiment as viewed from below. FIG. 1B is a cross-sectional view corresponding to the X1-X1 cross section of FIG. 1A. FIG. 2 is a cross-sectional view of a main part of the power conversion device according to the first embodiment as viewed from below. FIG. 3 is a side sectional view of a main part of the power converter according to the first embodiment. FIG. 4 is a bottom view of a main part of the power converter according to the second embodiment. FIG. 5 is a bottom view of a main part of the power converter according to the third embodiment. FIG. 6 is a bottom view of a main part of the power converter according to the fourth embodiment. FIG. 7 is a bottom view of a main part of the power converter according to the fifth embodiment. FIG. 8 is a bottom view of a main part of the power conversion device according to the sixth embodiment. FIG. 9 is a cross-sectional view of a main part of the power conversion device according to the seventh embodiment as viewed from below. FIG. 10 is a cross-sectional view of the power converter according to the eighth embodiment as viewed from below.

  Hereinafter, a power converter, a reactor, and a heat dissipation structure according to an embodiment will be described with reference to the drawings. However, each of the following embodiments is only a part of various embodiments of the present disclosure. Various modifications can be made to the following embodiments according to the design and the like as long as the object of the present disclosure can be achieved. Also, the drawings described in the following embodiments are schematic diagrams, and the ratio of the size and thickness of each component in the drawings does not necessarily reflect the actual dimensional ratio. Absent.

(Embodiment 1)
As shown in FIGS. 1A and 1B, the power conversion device 1 of the present embodiment includes a power conversion unit 2, a plurality (two in FIG. 1A) of heat transfer members 5, and a plurality (three in FIG. 1A) of heat sinks. 6 is provided. The power conversion unit 2 includes a DC-DC converter 31 and an inverter 32. The DC-DC converter 31 has a reactor 4. Inverter 32 has reactor 4. That is, the power conversion unit 2 has a plurality of (two in FIG. 1A) reactors 4. The power conversion unit 2 further includes a plurality of power devices 21 and a substrate 22 on which the plurality of power devices 21 are mounted. Each power device 21 is, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The substrate 22 is, for example, a printed wiring board.

  In the configuration of the power conversion device 1, a configuration including one reactor 4, one heat transfer member 5 adjacent to the reactor 4, and one heat sink 6 attached to the heat transfer member 5 is described as a reactor. It is referred to as device 10. Further, of the configuration of the power conversion device 1, a configuration including one heat transfer member 5 and one heat sink 6 attached to the heat transfer member 5 is referred to as a heat dissipation structure 11.

  Hereinafter, the plurality of heat transfer members 5 may be referred to as a first heat transfer member 5A and a second heat transfer member 5B, respectively. Hereinafter, the plurality of heat sinks 6 may be distinguished from each other and referred to as a first heat sink 6A, a second heat sink 6B, and a third heat sink 6C, respectively. Hereinafter, the plurality of reactors 4 may be distinguished from each other and referred to as a first reactor 4A and a second reactor 4B, respectively.

  The first reactor 4A is provided in the DC-DC converter 31. The second reactor 4B is provided in the inverter 32.

  Each reactor 4 includes an annular core 41 (see FIGS. 2 and 3). Each reactor 4 further includes a winding wound around core 41. Each reactor 4 is a toroidal coil.

  The first heat transfer member 5A is aligned with the first reactor 4A in the axial direction of the core 41. The first heat sink 6A is attached to the first heat transfer member 5A. The second heat transfer member 5B is aligned with the second reactor 4B in the axial direction of the core 41. The second heat sink 6B is attached to the second heat transfer member 5B.

  The power conversion unit 2 converts the input power and outputs the converted power. Converter 31 performs DC-DC conversion of DC power. Inverter 32 is electrically connected to converter 31. Inverter 32 performs an operation of converting DC power to AC power and an operation of converting AC power to DC power. More specifically, when DC power is input from the DC power supply, converter 31 performs DC-DC conversion of the DC power and outputs the DC power to inverter 32. Further, the inverter 32 converts DC power into AC power and outputs it to a load or a commercial power system. Inverter 32 receives AC power from the commercial power system, converts AC power into DC power, and outputs the DC power to converter 31. Further, converter 31 performs DC-DC conversion of the DC power and outputs the DC power to a storage battery or the like.

  Note that the inverter 32 may perform only one of the operation of converting DC power into AC power and the operation of converting AC power into DC power.

  When the converter 31 performs the DC-DC conversion, when the winding of the first reactor 4A of the converter 31 is energized, the first reactor 4A generates heat. The heat generated in the first reactor 4A is transmitted to the first heat sink 6A via the first heat transfer member 5A. The first heat sink 6A dissipates heat received from the first heat transfer member 5A.

  When the inverter 32 performs power conversion, the winding of the second reactor 4B of the inverter 32 is energized, so that the second reactor 4B generates heat. The heat generated in the second reactor 4B is transmitted to the second heat sink 6B via the second heat transfer member 5B. The second heat sink 6B dissipates heat received from the second heat transfer member 5B.

  Each heat transfer member 5 is formed using, for example, metal as a material. The heat conductivity of each heat transfer member 5 is larger than the heat conductivity of air. Therefore, heat can be efficiently transmitted from the reactor 4 to the heat sink 6 via the heat transfer member 5.

  As shown in FIGS. 2 and 3, each heat sink 6 has a base 61 and a plurality of fins 62. Each heat sink 6 is formed using a metal such as aluminum, for example. The base 61 has a plate shape. More specifically, the base 61 has a rectangular plate shape. The base 61 may have a square plate shape. The base 61 includes an opposing surface 611 and a surface 612 opposite to the opposing surface 611. The facing surface 611 of the first heat sink 6A faces the first heat transfer member 5A. Further, the facing surface 611 of the first heat sink 6A is in contact with the first heat transfer member 5A. The facing surface 611 of the second heat sink 6B faces the second heat transfer member 5B. Further, the facing surface 611 of the second heat sink 6B is in contact with the second heat transfer member 5B. The facing surface 611 of the third heat sink 6C faces the plurality of power devices 21. Further, the facing surface 611 of the third heat sink 6C contacts the plurality of power devices 21. More specifically, each power device 21 includes a package 211, and the package 211 is in contact with the facing surface 611. The plurality of fins 62 protrude from the surface 612.

  The plurality of heat sinks 6 are arranged separately from each other. Therefore, a rise in the temperature of one heat sink 6 hardly causes a rise in the temperature of another heat sink 6.

  The power converter 1 is used, for example, by being attached to a wall of a building or the like. When the power converter 1 is mounted on a wall or the like, the facing surface 611 becomes the front of the heat sink 6, and the opposite surface 612 becomes the back of the heat sink 6. The plurality of fins 62 face a wall of a building or the like.

  Each heat transfer member 5 includes a first portion 51 and a second portion 52. Each of the first portion 51 and the second portion 52 has a plate shape. More specifically, each of the first portion 51 and the second portion 52 has a rectangular plate shape. Each of the first portion 51 and the second portion 52 may have a square plate shape. The second part 52 is connected to the first part 51.

  The first portion 51 has a first surface 511 of the heat transfer member 5. The first surface 511 is a surface that intersects with the thickness direction of the first portion 51. The second portion 52 has a second surface 522 of the heat transfer member 5. The second surface 522 is a surface that intersects with the thickness direction of the second portion 52. The normal direction of the second surface 522 intersects the normal direction of the first surface 511. More specifically, the normal direction of the second surface 522 is orthogonal to the normal direction of the first surface 511. The first portion 51 protrudes from a surface 523 of the second portion 52 opposite to the second surface 522. Thus, the heat transfer member 5 is formed in an L shape.

  The power converter 1 includes a plurality (two: see FIG. 1A) of mounting members 81, a plurality (two: only two are shown in FIG. 2) of sheets 82, and a plurality (two: see FIG. 1A) of cases. 83. The plurality of mounting members 81 correspond one-to-one with the plurality of reactors 4 and are provided adjacent to the corresponding reactors 4 respectively. The plurality of sheets 82 correspond to the plurality of reactors 1 on a one-to-one basis, and are provided adjacent to the corresponding reactors 4 respectively. The plurality of cases 83 correspond to the plurality of reactors 1 on a one-to-one basis, and are provided around the corresponding reactors 4.

  Each mounting member 81 is plate-shaped. More specifically, each mounting member 81 has a rectangular plate shape. Each mounting member 81 is a member for mounting the corresponding reactor 4 to the heat transfer member 5. Each mounting member 81 is formed using, for example, metal as a material. The thermal conductivity of each mounting member 81 is higher than the thermal conductivity of air. Therefore, heat is transmitted from the reactor 4 to the heat transfer member 5 via the mounting member 81. Each mounting member 81 may have a square plate shape.

  Each mounting member 81 is adjacent to the heat transfer member 5 in the thickness direction of each mounting member 81. Each mounting member 81 is in contact with the first surface 511 of the heat transfer member 5. Each mounting member 81 is screwed to the heat transfer member 5. One side of each mounting member 81 is in contact with 523 of the second portion 52.

  Each sheet 82 is circular. Each sheet 82 is formed using, for example, resin. The thermal conductivity of each sheet 82 is higher than the thermal conductivity of air. Each sheet 82 is sandwiched between the mounting member 81 and the reactor 4. Thus, the seat 82 is held between the mounting member 81 and the reactor 4.

  Each reactor 4 faces the first surface 511 of the first portion 51 of the heat transfer member 5 in the axial direction of the core 41. Reactor 4 faces surface 523 of second portion 52 of heat transfer member 5 in a direction orthogonal to the axial direction of core 41. The axial direction of the core 41 is the horizontal direction in FIG. Each reactor 4 has a mounting member 81 and a sheet 82 sandwiched between the reactor 4 and the first surface 511 of the first portion 51.

  The reactor 4, the seat 82, the mounting member 81, and the first portion 51 are arranged in this order in the axial direction of the core 41. Each reactor 4 transmits heat to first section 51 via sheet 82 and mounting member 81.

  Each reactor 4 is attached to the first portion 51 via an attachment member 81. Each reactor 4 is arranged such that the axial direction of the core 41 is along the facing surface 611 of the heat sink 6. That is, each reactor 4 is fixed to heat transfer member 5 such that the axial direction of core 41 is along opposing surface 611.

  The diameter L2 of the core 41 is longer than the length L1 of the core 41 in the axial direction of the core 41. Therefore, when the reactor 4 is arranged so that the axial direction of the core 41 is along the facing surface 611 of the heat sink 6, compared with the case where the reactor 4 is arranged so that the axial direction is orthogonal to the facing surface 611, The area occupied by reactor 4 in power converter 1 as viewed from a direction orthogonal to facing surface 611 can be reduced.

  Further, each heat sink 6 is attached to the second portion 52 with the facing surface 611 facing the second surface 522 of the second portion 52. Further, the facing surface 611 is in contact with the second surface 522. Each heat sink 6 is attached to the second portion 52 by, for example, screwing.

  Each case 83 is formed of, for example, a resin. Each case 83 has a bottomed cylindrical shape. Each case 83 contains a corresponding reactor 4. Each reactor 4 is arranged between bottom 831 of case 83 and seat 82. Bottom portion 831 is in contact with reactor 4. Each case 83 is fixed to a mounting member 81. More specifically, each case 83 is screwed to the mounting member 81.

  Each case 83 is arranged at a distance from the second portion 52 of the heat transfer member 5. Each reactor 4 is arranged at a distance from the heat sink 6.

  The power conversion device 1 further includes a housing 71. The housing 71 is formed of, for example, metal or resin. The housing 71 houses the power conversion unit 2. The housing 71 has a rectangular parallelepiped shape. The housing 71 is horizontally long when viewed from the front of the housing 71. The housing 71 may be vertically long when viewed from the front of the housing 71, or may be square when viewed from the front of the housing 71.

  The housing 71 is attached to a building wall or the like. A plurality of (three in FIG. 1A) openings 712 are formed in a surface (hereinafter, referred to as a back surface 711) of the housing 71 which is a back surface when the housing 71 is attached to a wall of a building or the like. The plurality of openings 712 correspond one-to-one with the plurality of heat sinks 6. The base 61 of each heat sink 6 is arranged inside the corresponding opening 712. The plurality of fins 62 of each heat sink 6 are exposed outside the housing 71. The heat conductivity of the housing 71 is smaller than the heat conductivity of each heat sink 6.

  Inside the housing 71, the substrate 72 on which the plurality of power devices 21 are mounted is arranged in an area including the center of the housing 71 when viewed from the front of the housing 71. The first reactor 4A and the second reactor 4B are arranged on both sides of the substrate 72 in the lateral direction when viewed from the front of the housing 71.

  When the housing 71 is attached to a wall of a building or the like, the axial direction of the core 41 of each reactor 4 is along the horizontal direction. 1B, the distance L3 between each reactor 4 and the upper surface 713 of the housing 71 is determined by a distance L3 between each reactor 4 and the lower surface 714 of the housing 71. Is smaller than the distance L4 between them. Since the distance L3 is smaller than the distance L4, the heat generated in the reactor 4 reaches the upper surface 713 earlier than in the case where the magnitude relation between the distance L3 and the distance L4 is reversed. In the side surface 715 between the upper surface 713 and the lower surface 714 of the housing 71, a portion adjacent to the upper surface 713 may be provided with a vent hole for releasing heat.

(Modification of First Embodiment)
Next, modifications of the first embodiment will be listed. The following modifications may be implemented in combination as appropriate.

  Reactor 4 may be in contact with heat transfer member 5 in the axial direction of core 41. Reactor 4 may be in contact with first surface 511 of first portion 51, for example.

  It is not essential that the reactor 4 is fixed to the heat transfer member 5. The reactor 4 may be fixed to the heat sink 6 instead of being fixed to the heat transfer member 5. Further, reactor 4 may be fixed to both heat transfer member 5 and heat sink 6.

  In addition, when reactor 4 is fixed to heat transfer member 5, reactor 4 may be fixed to at least one of first portion 51 and second portion 52 of heat transfer member 5.

  Further, reactor 4 may be in contact with surface 512 (see FIG. 2) of first portion 51 opposite to first surface 511. Alternatively, the reactor 4 may be arranged with the heat transfer member 5 with a member (for example, the sheet 82 and the attachment member 81) having a higher thermal conductivity than air between the reactor 512 and the surface 512.

  Further, the number of reactors 4 and heat transfer members 5 may be one, or may be three or more. The number of heat sinks 6 may be one, two, or four or more.

  In the first embodiment, the number of reactors 4 and the number of heat transfer members 5 are the same, but the number of reactors 4 and the number of heat transfer members 5 may be different. That is, a plurality of heat transfer members 5 may be in contact with one reactor 4, or a plurality of reactors 4 may be in contact with one heat transfer member 5.

  In the first embodiment, the number of heat transfer members 5 and the number of heat sinks 6 are the same, but the number of heat transfer members 5 and the number of heat sinks 6 may be different. That is, a plurality of heat sinks 6 may be attached to one heat transfer member 5, or one heat sink 6 may be attached to a plurality of heat transfer members 5.

  Further, case 83 may house a plurality of reactors 4.

  Further, the heat transfer member 5 and the heat sink 6 may not be in direct contact with each other, and a member having a heat conductivity larger than that of air may be interposed between the heat transfer member 5 and the heat sink 6. .

  Further, the heat transfer member 5 of the first embodiment transfers heat between the first portion 51 and the second portion 52 by heat conduction, but the heat transfer member 5 is not limited to a member that transfers heat by heat conduction. The heat transfer member 5 may be, for example, a heat pipe that transfers heat by convection of a fluid such as water.

(Summary of Embodiment 1 and Modifications of Embodiment 1)
The following aspects are disclosed from the first embodiment described above and the modifications of the first embodiment.

  The power conversion device 1 includes a power conversion unit 2, a heat transfer member 5, and a heat sink 6. Power converter 2 has reactor 4. Reactor 4 includes an annular core 41. The power conversion unit 2 converts the input power and outputs the converted power. The heat transfer member 5 is in contact with the reactor 4 in the axial direction of the core 41, or the reactor 4 in the axial direction with a member (sheet 82 and the mounting member 81) having heat conductivity higher than air between the reactor 4 and the reactor 4. Line up with. The heat sink 6 has a facing surface 611 facing the heat transfer member 5. The heat sink 6 is attached to the heat transfer member 5. Reactor 4 is arranged such that the axial direction is along opposing surface 611.

  According to the above configuration, since the reactor 4 is disposed so that the axial direction of the core 41 is along the surface 611 of the heat sink 6 facing the heat transfer member 5, the power is viewed from a direction orthogonal to the surface 611. The area occupied by reactor 4 in converter 1 may be reduced.

  Further, in power conversion device 1, heat transfer member 5 includes a first portion 51 and a second portion 52. The first portion 51 has a first surface 511. The reactor 4 is attached to the first portion 51 in a state where the reactor 4 faces the first surface 511 in the axial direction. The second portion 52 has a second surface 522. The normal direction of the second surface 522 intersects the normal direction of the first surface 511. The second part 52 is connected to the first part 51. The heat sink 6 is attached to the second portion 52 with the facing surface 611 facing the second surface 522.

  According to the above configuration, an example of the configuration of the heat transfer member 5 to which the reactor 4 and the heat sink 6 are attached can be realized.

  In addition, the power conversion device 1 further includes a mounting member 81. The attachment member 81 is a member for attaching the reactor 4 to the heat transfer member 5. The thermal conductivity of the mounting member 81 is higher than the thermal conductivity of air.

  According to the above configuration, heat can be efficiently transmitted from the reactor 4 to the heat transfer member 5 via the attachment member 81.

  Moreover, in the power converter 1, the heat conductivity of the heat transfer member 5 is larger than the heat conductivity of air.

  According to the above configuration, heat can be efficiently transmitted from the reactor 4 to the heat sink 6 via the heat transfer member 5.

  In addition, the power conversion device 1 further includes a housing 71. The housing 71 houses the power conversion unit 2. Distance L3 between reactor 4 and upper surface 713 of housing 71 is smaller than distance L4 between reactor 4 and lower surface 714 of housing 71.

  According to the above configuration, the heat generated and rising in reactor 4 reaches upper surface 713 more quickly than in the case where the magnitude relationship between distance L3 and distance L4 is opposite. Therefore, heat is unlikely to diffuse to the vicinity of the lower surface 714 in the housing 71. That is, the temperature rise near the lower surface 714 in the housing 71 is suppressed.

  Further, power conversion device 1 includes a plurality of reactors 4. Power conversion unit 2 includes a converter 31 and an inverter 32. Converter 31 performs DC-DC conversion of DC power. Inverter 32 is electrically connected to converter 31. Inverter 32 performs at least one of an operation of converting DC power to AC power and an operation of converting AC power to DC power. One of the plurality of reactors 4 is a first reactor 4A provided in converter 31, and another one of the plurality of reactors 4 is a second reactor 4B provided in inverter 32.

  According to the above configuration, the power converter 2 can perform DC-DC conversion and conversion between DC power and AC power.

  The power conversion device 1 includes a plurality of heat transfer members 5. One of the plurality of heat transfer members 5 is in contact with the first reactor 4A or sandwiches the first member (the sheet 82 and the mounting member 81) having a higher thermal conductivity than air between the first reactor 4A and the first reactor 4A. Another one of the plurality of heat transfer members 5A is a heat transfer member 5A, and a second member (sheet 82) having a higher heat conductivity than air in contact with or between the second reactor 4B and the second reactor 4B. And the second heat transfer member 5B sandwiching the mounting member 81). The power conversion device 1 includes a plurality of heat sinks 6. One of the plurality of heat sinks 6 is a first heat sink 6A attached to the first heat transfer member 5A, and another one of the plurality of heat sinks 6 is a second heat sink attached to the second heat transfer member 5B. 6B.

  According to the above configuration, heat generated in each of first reactor 4A and second reactor 4B can be transmitted to heat transfer member 5 and radiated by heat sink 6.

  Further, reactor device 10 includes reactor 4, heat transfer member 5, and heat sink 6. Reactor 4 includes an annular core 41. The heat transfer member 5 is in contact with the reactor 4 in the axial direction of the core 41, or the reactor 4 in the axial direction with a member (sheet 82 and the mounting member 81) having heat conductivity higher than air between the reactor 4 and the reactor 4. Line up with. The heat sink 6 has a facing surface 611 facing the heat transfer member 5. The heat sink 6 is attached to the heat transfer member 5. Reactor 4 is arranged such that the axial direction of core 41 is along opposing surface 611.

  According to the above configuration, since the reactor 4 is disposed so that the axial direction of the core 41 is along the surface 611 facing the heat transfer member 5 in the heat sink 6, the reactor 4 is viewed from a direction orthogonal to the facing surface 611. The area occupied by the reactor 4 in the device 10 may be reduced.

  The heat dissipation structure 11 includes the heat transfer member 5 and the heat sink 6. The heat transfer member 5 is in contact with the reactor 4 including the annular core 41 in the axial direction of the core 41, or has a heat conductivity between the reactor 4 and the reactor 4 greater than that of air (the sheet 82 and the mounting member 81). ) Is arranged in line with the reactor 4 in the axial direction. The heat sink 6 has a facing surface 611 facing the heat transfer member 5. The heat sink 6 is attached to the heat transfer member 5. Reactor 4 is fixed to at least one of heat transfer member 5 and heat sink 6 such that the axial direction is along opposing surface 611.

  According to the above configuration, since the reactor 4 is disposed so that the axial direction of the core 41 is along the surface 611 of the heat sink 6 facing the heat transfer member 5, the heat radiation is viewed from a direction orthogonal to the surface 611. The area occupied by the reactor 4 in the structure 11 may be small.

(Embodiment 2)
Hereinafter, a power conversion device 1C according to the second embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The power conversion device 1 </ b> C differs from the power conversion device 1 of the first embodiment in the mounting structure of the reactor 4 to the heat transfer member 5. Power conversion device 1 </ b> C includes two mounting members 81 per reactor 4. Further, power conversion device 1C includes two sheets 82 for one reactor 4. The power converter 1C includes a plurality of (two in FIG. 4) connecting members 84 for one reactor 4. That is, the power converter 1C includes four mounting members 81, four seats 82, and four connecting members 84. The power conversion device 1C does not include the case 83 (see FIG. 2).

  Each reactor 4 is sandwiched between two mounting members 81 from both sides of the core 41 in the axial direction. Further, a sheet 82 is sandwiched between each mounting member 81 and the reactor 4. In the axial direction of the core 41, one attachment member 81, one sheet 82, the reactor 4, another one sheet 82, another one attachment member 81, and the first portion 51 of the heat transfer member 5 overlap in this order. ing.

  Each connecting member 84 connects the two mounting members 81. Each connecting member 84 is, for example, a screw. Each connecting member 84 has a shaft portion 841 and a head portion 842. The shaft portion 841 has a rod shape. The shaft portion 841 is passed through holes provided in two mounting members 81 corresponding to one reactor 4. The head 842 is provided at the tip of the shaft 841. The head 842 is larger than the shaft 841 when viewed from the axial direction of the shaft 841. The head 842 presses, of the two mounting members 81 corresponding to one reactor 4, the mounting member 81 farther from the first portion 51 of the heat transfer member 5 toward the first portion 51. That is, the reactor 4 is sandwiched between the two mounting members 81 from both sides in the axial direction of the core 41 by the fastening force of each connection member 84 as a screw. Thereby, reactor 4 is held between two attachment members 81, and the position of reactor 4 with respect to heat transfer member 5 is fixed.

  Of the two mounting members 81, the mounting member 81 farther from the first portion 51 of the heat transfer member 5 is screwed to the first portion 51. This screw is a screw provided separately from the connecting member 84. Note that the screw may be omitted, and the connecting member 84 may screw the mounting member 81 of the two mounting members 81 that is farther from the first portion 51 of the heat transfer member 5 to the first portion 51. .

(Embodiment 3)
Hereinafter, a power conversion device 1D according to the third embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The power conversion device 1D differs from the power conversion device 1 of the first embodiment in the mounting structure of the reactor 4 to the heat transfer member 5. Each of the two (only one is shown in FIG. 5) mounting members 81D of the power converter 1D is formed by a leaf spring. Each attachment member 81D is formed, for example, using metal as a material. The thermal conductivity of each mounting member 81D is larger than the thermal conductivity of air. Power conversion device 1 </ b> C includes three sheets 82 per reactor 4. That is, the power conversion device 1 </ b> C includes the six sheets 82. The power converter 1D does not include the case 83 (see FIG. 2).

  Each mounting member 81D is U-shaped. Each mounting member 81D is screwed to the first portion 51 of the heat transfer member 5. Each reactor 4 is sandwiched between mounting members 81D corresponding to the reactor 4 from both sides in the axial direction of the core 41. Thus, each reactor 4 is held by the mounting member 81D, and the position of the reactor 4 with respect to the heat transfer member 5 is fixed. Two sheets 82 are arranged on both axial sides of each reactor 4. These two sheets 82 are sandwiched between the reactor 4 and the mounting member 81D. Between the reactor 4 and the first portion 51, an attachment member 81D and one sheet 82 are sandwiched. The reactor 4 is aligned with the first portion 51 in the axial direction of the core 41.

  A sheet 82 is sandwiched between each reactor 4 and the second portion 52 of the heat transfer member 5. Each reactor 4 is aligned with the second portion 52 in a direction perpendicular to the axial direction of the core 41 (vertical direction in the drawing of FIG. 5).

  The heat generated in the reactor 4 is transmitted to the first portion 51 of the heat transfer member 5 via the sheets 82 provided on both sides of the core 41 in the axial direction and the mounting member 81D. Further, the heat generated in reactor 4 is transmitted to second portion 52 via sheet 82 provided between reactor 4 and second portion 52 of heat transfer member 5. As described above, since the heat generated in the reactor 4 is transmitted to the heat transfer member 5 from two directions, the heat radiation efficiency of the reactor 4 is improved as compared with the case where the heat is transmitted to the heat transfer member 5 from only one direction.

  Reactor 4 may be in contact with at least one of first portion 51 and second portion 52 of heat transfer member 5.

(Summary of Embodiment 3)
The following aspects are disclosed from the third embodiment described above.

  In the power conversion device 1D, the direction in which the heat transfer member 5 is in contact with the reactor 4 or is arranged with the reactor 4 with a member having a higher thermal conductivity than air (the sheet 82 and the mounting member 81D) between the reactor 4 and the reactor 4 41 includes two directions of an axial direction and a direction orthogonal to the axial direction.

  According to the above configuration, the direction in which the heat transfer member 5 is in contact with the reactor 4 or the direction in which the heat transfer member 5 is arranged with the reactor 4 with the member (the sheet 82 and the mounting member 81D) having a higher thermal conductivity than air between the reactor 4 and The amount of heat transferred from the reactor 4 to the heat transfer member 5 per unit time can be increased as compared with the case where only one of the axial direction and the direction orthogonal to the axial direction of the core 41 is provided. Therefore, the heat radiation efficiency of the reactor 4 is improved.

(Embodiment 4)
Hereinafter, a power conversion device 1E according to the fourth embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Heat transfer member 5E (each of the first and second heat transfer members) includes a first portion 51E and a second portion 52E. The first portion 51E and the second portion 52E are plate-shaped. The first portion 51E protrudes from a surface (a surface 523) of the second portion 52E that intersects the thickness direction of the second portion 52E. The opposing surface 611 of the heat sink 6 is in contact with the surface 524 of the second portion 52E opposite to the surface 523.

  The first reactor 4A and the second reactor 4B face a common heat transfer member 5E. More specifically, the reactor 4 faces both surfaces of the first portion 51E, that is, surfaces 513 and 514, respectively. The first reactor 4A faces the surface 513, and the second reactor 4B faces the surface 514. The sheet 82 and the mounting member 81 are sandwiched between the surface 513 and the first reactor 4A and between the surface 514 and the second reactor 4B, respectively. The mounting structure between the heat transfer member 5E and the reactor 4 on each surface 513, 514 was the same as the mounting structure between the heat transfer member 5 and the reactor 4 in the first embodiment. However, as the mounting structure between the heat transfer member 5E and the reactor 4 on each of the surfaces 513 and 514, the mounting structure described in the embodiment other than the first embodiment may be adopted. Further, the mounting structure between the heat transfer member 5E and the reactor 4 on the surface 513 may be different from the mounting structure between the heat transfer member 5E and the reactor 4 on the surface 514.

  Further, both first reactor 4A and second reactor 4B may face surface 513 of heat transfer member 5E, or both first reactor 4A and second reactor 4B may face surface 513 of heat transfer member 5E. 514 may be opposed.

  Further, three or more reactors 4 may face common heat transfer member 5E.

  Further, at least one of first reactor 4A and second reactor 4B may be in contact with heat transfer member 5E.

(Summary of Embodiment 4)
From Embodiment 4 described above, the following aspects are disclosed.

  In the power conversion device 1E, the heat transfer member 5E is in contact with the first reactor 4A, or sandwiches the first member (the sheet 82 and the attachment member 81) having a higher thermal conductivity than air between the first reactor 4A and the first reactor 4A. . The heat transfer member 5E is in contact with the second reactor 4B or sandwiches a second member (the sheet 82 and the attachment member 81) having a higher thermal conductivity than air between the second reactor 4B and the second reactor 4B.

  According to the above configuration, the number of heat transfer members can be reduced as compared with the case where the first reactor 4A and the second reactor 4B are in contact with different heat transfer members.

(Embodiment 5)
Hereinafter, a power conversion device 1F according to the fifth embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The heat transfer member 5F (each of the first and second heat transfer members) is U-shaped. The heat transfer member 5F includes a base 53 and two side walls 54. The base 53 and the two side walls 54 are each plate-shaped. The heat sink 6 is attached to the base 53. The two side walls 54 project from the base 53 in the thickness direction of the base 53. The two side walls 54 extend from the base 53 to the side opposite to the heat sink 6 side.

  Reactor 4 is arranged between two side walls 54. The reactor 4 is arranged with two side walls 54 in the axial direction of the core 41. Further, the reactor 4 is aligned with the base 53 in a direction perpendicular to the axial direction of the core 41. That is, the reactor 4 is aligned with the heat transfer member 5F in three directions. More specifically, the reactor 4 is aligned with one side wall 54 in the right direction of the paper of FIG. 7 along the axial direction of the core 41 and the other side wall 54 in the left direction of the paper of FIG. Are aligned with the base 53 in the downward direction of the paper of FIG. 7 orthogonal to the axial direction of the core 41.

  The seat 82 is sandwiched between the reactor 4 and the base 53 and between the reactor 4 and each side wall 54.

  Reactor 4 may be in contact with at least one of base 53 and two side walls 54 of heat transfer member 5F.

(Summary of Embodiment 5)
From Embodiment 5 described above, the following aspects are disclosed.

  In power conversion device 1F, the direction in which heat transfer member 5F is in contact with or aligned with reactor 4 includes two directions: an axial direction of core 41 and a direction orthogonal to the axial direction. The direction in which the heat transfer member 5F is in contact with the reactor 4 or in which the heat transfer member 5F is arranged with the reactor 4 with a member (sheet 82) having a higher thermal conductivity than air between the reactor 4 includes at least three directions.

  According to the above configuration, the heat transfer member 5F is in contact with the reactor 4 only in one or two directions, or is arranged with the reactor 4 with a member (sheet 82) having a higher thermal conductivity than air between the reactor 4 and the reactor. As compared with the case, the heat radiation efficiency of the reactor 4 is improved.

(Embodiment 6)
Hereinafter, a power conversion device 1G according to the sixth embodiment will be described with reference to FIG. The same components as those in the fifth embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The shape of the heat transfer member 5G (each of the first and second heat transfer members) of the present embodiment is the same as the shape of the heat transfer member 5F of the fifth embodiment. However, the heat transfer member 5G is arranged in a direction rotated by 90 degrees with respect to the heat sink 6 as compared with the heat transfer member 5F. One of the two side walls 54 is in contact with the facing surface 611 of the heat sink 6.

  Reactor 4 is arranged between two side walls 54. Reactor 4 is arranged with two side walls 54 in a direction perpendicular to the axial direction of core 41. Further, the reactor 4 is aligned with the base 53 in the axial direction of the core 41. That is, the reactor 4 is aligned with the heat transfer member 5G in three directions. More specifically, the reactor 4 is aligned with one of the side walls 54 in the upward direction on the paper surface of FIG. 8 along the direction orthogonal to the axial direction of the core 41, and the reactor 4 of FIG. 8 along the direction orthogonal to the axial direction of the core 41. It is aligned with the other side wall 54 in the downward direction on the paper surface and with the base 53 in the leftward direction on the paper surface of FIG. 8 along the axial direction of the core 41.

  The seat 82 is sandwiched between the reactor 4 and the base 53 and between the reactor 4 and each side wall 54.

  In the power converter 1G of the present embodiment, as in the power converter 1G of the fifth embodiment, the radiation efficiency of the reactor 4 can be improved.

  Reactor 4 may be in contact with at least one of base 53 and two side walls 54 of heat transfer member 5G.

(Embodiment 7)
Hereinafter, a power converter 1H according to the seventh embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In power converter 1H, heat transfer member 5H (each of the first and second heat transfer members) has a bottomed cylindrical shape. Heat transfer member 5H includes a bottom wall 55 and a side wall 56. The outer bottom surface 551 of the bottom wall is in contact with the facing surface 611 of the heat sink 6.

  The power conversion device 1H includes an intervening portion 91 and a spacer 92. The intervening portion 91 and the spacer 92 have electric insulation. The spacer 92 is in contact with the inner bottom surface 552 of the bottom wall 55 of the heat transfer member 5H. Reactor 4 is arranged inside heat transfer member 5H. Spacer 92 is sandwiched between inner bottom surface 552 and reactor 4. Spacer 92 maintains the distance between inner bottom surface 552 and reactor 4. Reactor 4 faces side wall 56 of heat transfer member 5H in the axial direction of core 41.

  Interposed portion 91 is interposed between reactor 4 and heat transfer member 5H. Interposed portion 91 fills a gap between reactor 4 and heat transfer member 5H. The reactor 4 has a part of the interposed portion 91 sandwiched between the reactor 4 and the side wall 56 in the axial direction of the core 41. The intervening portion 91 is formed of, for example, a coating agent, an adhesive, a sealing agent, or a filler. The interposition part 91 is formed using, for example, a resin as a material. The intervening portion 91 is filled inside the heat transfer member 5H. The thermal conductivity of the interposition part 91 is larger than the thermal conductivity of air.

  The heat generated in reactor 4 is transmitted to heat transfer member 5H via interposed portion 91. Thereby, the reactor 4 can radiate heat.

  Note that the head of the screw passed through the heat transfer member 5H for screwing the heat sink 6 to the heat transfer member 5H projects from the inner bottom surface 552 of the bottom wall 55, and the head is replaced with the spacer 92. Thereby, the distance between inner bottom surface 552 and reactor 4 may be maintained.

  Further, in the present embodiment, the intervening portion 91 is provided so as to fill the internal space of the heat transfer member 5H by about half, but the amount of the intervening portion 91 may be larger or smaller.

(Embodiment 8)
Hereinafter, a power conversion device 1J according to the eighth embodiment will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the power converter 1J, the first heat transfer member 5A and the second heat transfer member 5B are attached to one heat sink 6J. Therefore, the heat generated in the two reactors 4 is radiated from one heat sink 6J.

  According to the present embodiment, the number of steps required for mounting the heat sink 6J can be reduced as compared to the case where the power converter 1J includes a plurality of heat sinks 6 like the power converter 1 of the first embodiment.

  Each of the above-described embodiments may be implemented in an appropriate combination including modified examples.

1, 1C, 1D, 1E, 1F, 1G, 1H, 1J Power converter 10 Reactor 11 Heat dissipation structure 2 Power converter 31 Converter 32 Inverter 4 Reactor 4A First reactor 4B Second reactor 41 Cores 5, 5E, 5F, 5G, 5H Heat transfer member 5A First heat transfer member 5B Second heat transfer member 51, 51E First portion 511 First surface 52, 52E Second portion 522 Second surface 6, 6J Heat sink 6A First heat sink 6B 2 heat sink 611 opposing surface 71 housing 713 upper surface 714 lower surface 81, 81D mounting member (member)
82 sheets (members)
L3 distance L4 distance

Claims (12)

A power conversion unit that has a reactor including an annular core, converts an input power and outputs the power,
A heat transfer member that is in contact with the reactor in the axial direction of the core, or that is arranged in parallel with the reactor in the axial direction with a member having a larger thermal conductivity than air between the reactor and
A heat sink having a facing surface facing the heat transfer member and attached to the heat transfer member,
The reactor is arranged so that the axial direction is along the facing surface,
Power converter. The direction in which the heat transfer member is in contact with the reactor or the reactor has a larger thermal conductivity than air between the reactor and the member and the direction parallel to the reactor is orthogonal to the axial direction of the core and the axial direction. Including two directions,
The power converter according to claim 1. The direction in which the heat transfer member is in contact with the reactor or in which the heat transfer member is arranged with the reactor with the thermal conductivity greater than air between the reactor and the reactor includes at least three directions,
The power converter according to claim 2. The heat transfer member,
A first portion having a first surface, to which the reactor is attached in a state where the reactor faces the first surface in the axial direction;
A second portion having a second surface whose normal direction intersects the normal direction of the first surface, and a second portion connected to the first portion;
The heat sink is attached to the second portion with the facing surface facing the second surface,
The power converter according to claim 1. Further comprising a mounting member for mounting the reactor to the heat transfer member,
The thermal conductivity of the mounting member is greater than the thermal conductivity of air.
The power converter according to claim 1. The heat conductivity of the heat transfer member is larger than the heat conductivity of air.
The power converter according to any one of claims 1 to 5. Further comprising a housing for housing the power conversion unit,
The distance between the reactor and the upper surface of the housing is smaller than the distance between the reactor and the lower surface of the housing,
The power converter according to any one of claims 1 to 6. Comprising a plurality of said reactors,
The power converter,
A converter for converting DC power into DC-DC,
An inverter that is electrically connected to the converter and performs at least one of an operation of converting DC power to AC power and an operation of converting AC power to DC power,
One of the plurality of reactors is a first reactor provided in the converter, and another one of the plurality of reactors is a second reactor provided in the inverter.
The power converter according to any one of claims 1 to 7. A plurality of the heat transfer members,
One of the plurality of heat transfer members is a first heat transfer member that is in contact with the first reactor or sandwiches a first member having a higher thermal conductivity than air between the first reactor and the first reactor. Another one of the heat transfer members is a second heat transfer member that is in contact with the second reactor or sandwiches a second member having a higher thermal conductivity than air between the second reactor and the second reactor,
Comprising a plurality of the heat sinks,
One of the plurality of heat sinks is a first heat sink attached to the first heat transfer member, and another one of the plurality of heat sinks is a second heat sink attached to the second heat transfer member. is there,
The power converter according to claim 8. The heat transfer member is in contact with the first reactor, or sandwiches a first member having a larger thermal conductivity than air between the first reactor and the first reactor,
The heat transfer member is in contact with the second reactor, or sandwiches a second member having a higher thermal conductivity than air between the second reactor and the second reactor.
The power converter according to claim 8. A reactor including an annular core,
A heat transfer member that is in contact with the reactor in the axial direction of the core, or that is arranged in parallel with the reactor in the axial direction with a member having a larger thermal conductivity than air between the reactor and
A heat sink having a facing surface facing the heat transfer member and attached to the heat transfer member,
The reactor is arranged so that the axial direction is along the facing surface,
Reactor device. For a reactor including an annular core, a heat transfer member that is in contact with the core in the axial direction, or a heat transfer member that is arranged in parallel with the reactor in the axial direction with a member having a higher thermal conductivity than air between the reactor and the reactor. ,
A heat sink having a facing surface facing the heat transfer member and attached to the heat transfer member,
The reactor is fixed to at least one of the heat transfer member and the heat sink so that the axial direction is along the facing surface.
Heat dissipation structure.

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