Power conversion device and elevator control panel

Abstract

A power conversion device (100) is provided with a first phase unit group (1U), a first cooling plate (4U), a first air volume branch wind tunnel (81U1), and a first fan (7U). The first phase cell group includes a first phase first power conversion circuit unit (1U1) and a first phase second power conversion circuit unit (1U2) arranged adjacent to each other in a first direction (DR1). The first phase first power conversion circuit unit and the first phase second power conversion circuit unit are electrically connected in parallel with each other. The first cooling plate is connected to the first phase cell group, and is disposed side by side with the first phase cell group in a second direction (DR2) perpendicular to the first direction. The first air volume branch wind tunnel is disposed between the first cooling plate and the first fan in a third direction perpendicular to each of the first direction and the second direction. A first outlet port (81c) and a second outlet port (81d) through which air sent from the first fan flows out are formed in the first air volume branch wind tunnel. The first outlet is formed so as to overlap the first cooling plate in a third direction (DR3). In the third direction, the second outlet is formed so as to overlap a surface (SF1) of the first phase cell group on the opposite side of the first cooling plate in the second direction and a first space (SP1) facing the surface.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power conversion device and an elevator control panel. BACKGROUND

[0002] Conventionally, there is a power conversion device provided with a plurality of semiconductor elements connected in parallel to each other, and a wiring member such as a bus bar. The semiconductor element is, for example, an insulated gate bipolar transistor (IGBT). The bus bar connects the semiconductor elements in parallel. In addition, the bus bar connects the semiconductor elements with a load. The load is, for example, a hoisting machine or a motor. It is assumed that in a case where the difference in impedance of the bus bar from each semiconductor element to the load is large, it is difficult to cause uniform current to flow through each semiconductor element. That is, the current flowing through each semiconductor element can be deviated. Such a power conversion device can be applied to an elevator control panel or the like. The power converter used in the elevator control panel is required to be thin due to constraints on the installation space.

[0003] For example, the three-phase power conversion device described in Japanese Patent No. 5557891 (Patent Literature 1) is provided with a plurality of semiconductor packages (a first phase first power conversion circuit unit and a first phase second power conversion circuit unit included in a first phase unit group), a cooling fin (a first cooling plate) connected to the plurality of semiconductor packages, a bus bar (a first wiring member), and a capacitor. The cooling fin is disposed at a lower air flow position than the capacitor, and the bus bar is disposed at a lower air flow position than the cooling fin.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent No. 5557891 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the three-phase power conversion device described in Patent Literature 1, the bus bar has a three-dimensional shape disposed in a manner sandwiching the cooling fin. Therefore, it is difficult to thin the size of the three-phase power conversion device in a direction perpendicular to the extension direction of the bus bar.

[0009] In addition, in the three-phase power conversion device described in Patent Literature 1, the capacitor, the plurality of semiconductor packages and the cooling fin, and the bus bar are disposed in the order described along an air-cooling air path. Therefore, it is difficult to efficiently exhaust heat from the semiconductor packages and the cooling fin.

[0010] The present disclosure has been achieved in view of the above-described problems, and aims to provide a power conversion device and an elevator control panel that can be thinned and can efficiently exhaust heat from a first phase unit group and a first cooling plate.

[0011] Means for solving the problems

[0012] The power conversion device of the present disclosure includes a first phase unit group, a first cooling plate, a first air volume branch air tunnel, and a first fan. The first phase unit group includes a first phase first power conversion circuit unit and a first phase second power conversion circuit unit that are arranged adjacent to each other in a first direction. The first phase first power conversion circuit unit and the first phase second power conversion circuit unit are electrically connected in parallel to each other. The first cooling plate is connected to the first phase unit group and is arranged side by side with the first phase unit group in a second direction that is perpendicular to the first direction. The first air volume branch air tunnel is arranged between the first cooling plate and the first fan in a third direction that is perpendicular to the first direction and the second direction, respectively. A first flow outlet and a second flow outlet through which air sent from the first fan flows out are formed in the first air volume branch air tunnel. In the third direction, the first flow outlet is formed so as to overlap the first cooling plate. In the third direction, the second flow outlet is formed so as to overlap a surface of the first phase unit group that is located on the opposite side of the first cooling plate in the second direction and a first space facing the surface.

[0013] Effects of the Invention

[0014] According to the power conversion device of the present disclosure, the first cooling plate is arranged on the side opposite to the first wiring member with respect to the first phase unit group in the second direction. That is, the first wiring member is arranged on the side opposite to the first cooling plate with respect to the first phase unit group in the second direction. Therefore, it is possible to thin the size of the power conversion device. In addition, according to the power conversion device of the present disclosure, in the third direction, the first flow outlet is formed so as to overlap the first cooling plate, and the second flow outlet is formed so as to overlap a surface of the first phase unit group that is located on the opposite side of the first cooling plate in the second direction and a first space facing the surface. Therefore, it is possible to efficiently exhaust heat from the first phase unit group and the first cooling plate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view that schematically shows the structure of the power conversion device of Embodiment 1.

[0016] Figure 2 is a perspective view that schematically shows the structure of the first phase first power conversion circuit unit, the first cooling plate, and the bolt of the power conversion device of Embodiment 1.

[0017] Figure 3is a sectional view for illustrating cooling air formed inside a first air amount branch air tunnel and a main air tunnel of the power conversion device of Embodiment 1.

[0018] Figure 4 is a perspective view schematically showing a structure of the first air amount branch air tunnel of the power conversion device of Embodiment 1.

[0019] Figure 5 is a perspective view schematically showing a structure of a control panel for an elevator to which the power conversion device of Embodiment 1 is applied.

[0020] Figure 6 is a perspective view schematically showing an internal structure of the control panel shown in Figure 5

[0021] Figure 7 is a sectional view schematically showing a first air passage and a second air passage formed inside the control panel shown in Figure 5 and Figure 6

[0022] Figure 8 is a circuit diagram schematically showing a structure of the power conversion device of Embodiment 1.

[0023] Figure 9 is a sectional view schematically showing an air passage formed inside a control panel for an elevator to which the power conversion device of the comparative example is applied.

[0024] Figure 10 is a perspective view schematically showing a structure of the power conversion device of Embodiment 2.

[0025] Figure 11 is a view schematically showing an example of a configuration mode of a plurality of fans in the power conversion device of Embodiment 2.

[0026] Figure 12 is a sectional view schematically showing an internal structure of a first air amount branch air tunnel of the power conversion device of Embodiment 3.

[0027] Figure 13 is a sectional view schematically showing an internal structure of a first air amount branch air tunnel of the power conversion device of Embodiment 4.

[0028] Figure 14 is a perspective view schematically showing a structure of the first air amount branch air tunnel of the power conversion device of Embodiment 4.

[0029] Figure 15 is a sectional view schematically showing an internal structure of a first air amount branch air tunnel of the power conversion device of Embodiment 5.

[0030] Figure 16 ​​is a perspective view schematically showing the structure of the first air volume branch wind tunnel of the power conversion device of Embodiment 5. DETAILED DESCRIPTION

[0031] Hereinafter, the embodiments will be described with reference to the drawings. Furthermore, hereinafter, the same or equivalent portions are denoted by the same reference numerals, and repeated description will not be repeated.

[0032] Embodiment 1.

[0033] Use Figures 1-8 The structure of the power conversion device 100 of Embodiment 1 will be described. The power conversion device 100 is configured as a three-phase power conversion device. The power conversion device 100 of the present embodiment can be applied to a control panel for an elevator.

[0034] As shown in Figure 1 , the power conversion device 100 mainly includes a first phase unit group 1U, a first bus bar 2U (a first wiring member), a first cooling plate 4U, a plurality of first fans 7U, and a plurality of first air volume branch wind tunnels 81U. In the present embodiment, the power conversion device 100 includes a second phase unit group 1V, a third phase unit group 1W, a second bus bar 2V (a second wiring member), a third bus bar 2W, a fourth bus bar 3U, a fifth bus bar 3V, a sixth bus bar 3W, a second cooling plate 4V, a third cooling plate 4W, a conductor portion 5, a plurality of bolts 6, a plurality of second fans 7V, a plurality of third fans 7W, a plurality of second air volume branch wind tunnels 81V, a plurality of third air volume branch wind tunnels 81W, and a main wind tunnel 82. Although not shown, a control device such as a substrate is arranged on the front surface where the bus bars are arranged. Furthermore, in Figure 1 , the bolts 6 are represented by double circles for convenience of description. In Figure 2 , the illustration of the first air volume branch wind tunnel 81U and the main wind tunnel 82 is omitted. In Figure 3 , the illustration of the first bus bar 2U and the fourth bus bar 3U is omitted.

[0035] The first phase unit group 1U, the second phase unit group 1V, and the third phase unit group 1W are configured to perform input and output of U phase, V phase, and W phase, respectively. It is preferable that the first phase unit group 1U, the second phase unit group 1V, and the third phase unit group 1W have the same shape as each other. It is preferable that the first bus bar 2U to the sixth bus bar 3W have the same shape as each other. It is preferable that the first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W have the same shape as each other. It is preferable that the plurality of first fans 7U, the plurality of second fans 7V, and the plurality of third fans 7W have the same shape as each other. It is preferable that the plurality of first air volume branch wind tunnels 81U, the plurality of second air volume branch wind tunnels 81V, and the plurality of third air volume branch wind tunnels 81W have the same shape as each other, respectively.

[0036] <Structure of the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W>

[0037] The 1st phase unit group 1U includes the 1st phase 1st power conversion circuit unit 1U1 and the 1st phase 2nd power conversion circuit unit 1U2. The 1st phase unit group 1U can also be configured in 2-parallel by the 1st phase 1st power conversion circuit unit 1U1 and the 1st phase 2nd power conversion circuit unit 1U2. The 1st phase unit group 1U can also include the 1st phase 3rd power conversion circuit unit 1U3. In this case, the 1st phase unit group 1U is configured in 3-parallel by the 1st phase 1st power conversion circuit unit 1U1, the 1st phase 2nd power conversion circuit unit 1U2, and the 1st phase 3rd power conversion circuit unit 1U3. In the present embodiment, the 1st phase unit group 1U is 3-parallel. The 1st phase 1st power conversion circuit unit 1U1 to the 1st phase 3rd power conversion circuit unit 1U3 are each configured as a 1-phase 1-parallel power conversion circuit unit. It is preferable that each power conversion circuit unit of the 1st phase unit group 1U has the same shape as each other.

[0038] The 1st phase 1st power conversion circuit unit 1U1, the 1st phase 2nd power conversion circuit unit 1U2, and the 1st phase 3rd power conversion circuit unit 1U3 are arranged side by side in the 1st direction DR1 in the order described above. The 1st phase 3rd power conversion circuit unit 1U3 is arranged adjacent to the 1st phase 2nd power conversion circuit unit 1U2 on the side opposite to the 1st phase 1st power conversion circuit unit 1U1.

[0039] The 1st cooling plate 4U is arranged to overlap the 1st phase unit group 1U in the 2nd direction DR2. The direction in which the 1st input-side semiconductor module 1U11 and the 1st output-side semiconductor module 1U12 described later are arranged is the 3rd direction DR3. The 1st direction DR1, the 2nd direction DR2, and the 3rd direction DR3 intersect each other. In the present embodiment, the 1st direction DR1, the 2nd direction DR2, and the 3rd direction DR3 are perpendicular to each other. In the case where the power conversion device 100 is applied to a control panel for an elevator, for example, the 1st direction DR1 and the 2nd direction DR2 are horizontal directions, and the 3rd direction DR3 is a vertical direction.

[0040] As Figure 1 and Figure 2As shown, the first phase first power conversion circuit unit 1U1 includes a first input side semiconductor module 1U11, a first output side semiconductor module 1U12, a first phase first capacitor 1U13, and a first phase first substrate 1U14. The first phase first power conversion circuit unit 1U1 is configured so that a current flows in the order of the first input side semiconductor module 1U11, the first phase first capacitor 1U13, and the first output side semiconductor module 1U12, or in the order of the first output side semiconductor module 1U12, the first phase first capacitor 1U13, and the first input side semiconductor module 1U11. It is preferable that the input side semiconductor modules of the respective power conversion circuit units have the same shape as each other. It is preferable that the output side semiconductor modules of the respective power conversion circuit units have the same shape as each other. It is preferable that the capacitors of the respective power conversion circuit units have the same shape as each other. It is preferable that the substrates of the respective power conversion circuit units have the same shape as each other.

[0041] The first output side semiconductor module 1U12 is electrically connected to the first input side semiconductor module 1U11 via the first phase first capacitor 1U13. The first phase first capacitor 1U13 is electrically connected to the first input side semiconductor module 1U11. The first phase first capacitor 1U13 is mounted to the first phase first substrate 1U14. Thus, the first phase first capacitor 1U13 is mounted to a substrate.

[0042] The first input side semiconductor module 1U11 and the first output side semiconductor module 1U12 are configured by, for example, a 2-in-1 package in which two insulated gate bipolar transistors (IGBTs) are built into one package. The first input side semiconductor module 1U11 and the first output side semiconductor module 1U12 are not limited to a 2-in-1 package, and a 1-in-1 package or the like can be used. In this case, the respective packages are connected by, for example, a bus bar. The first input side semiconductor module 1U11 and the first output side semiconductor module 1U12 can be configured by a metal oxide semiconductor field effect transistor (MOSFET) or a transistor.

[0043] The kind of the first phase first capacitor 1U13 is, for example, a film capacitor, an electrolytic capacitor, or the like. The kind of the first phase first capacitor 1U13 can be appropriately determined according to the use. A plurality of capacitors can be mounted to the first phase first substrate 1U14 in a state of being connected in series or in parallel. The first phase first capacitor 1U13 is mounted to the first phase first substrate 1U14 by, for example, welding.

[0044] The first phase first substrate 1U14 is fixed to the first input-side semiconductor module 1U11 and the first output-side semiconductor module 1U12 by a through hole provided in the substrate and an external screw. As the through hole, a through hole of the first phase first substrate 1U14 can also be used. The first phase first substrate 1U14 can also be fixed to the first input-side semiconductor module 1U11 and the first output-side semiconductor module 1U12 by a terminal connected to the first phase first substrate 1U14. The terminal is composed of a metal having high conductivity such as copper (Cu) or aluminum (Al). The first phase first substrate 1U14 is, for example, a printed substrate. The first phase first substrate 1U14 can also be a laminated bus bar composed of a bus bar and an insulating film.

[0045] The second phase unit group 1V and the third phase unit group 1W also have the same structure as the first phase unit group 1U.

[0046] Each power conversion circuit unit has the same input-side semiconductor module and the same output-side semiconductor module. In this case, the configuration of each power conversion circuit unit can be shared. Thus, the manufacturing cost of the power conversion device 100 can be reduced by standardization of the manufacturing and assembly work of each power conversion circuit unit.

[0047] Further, since the power conversion device 100 is a three-phase power conversion device, the power conversion device 100 includes at least three power conversion circuit units. In the present embodiment, the power conversion device 100 is a 3-phase 3-parallel power conversion device, and thus the power conversion device 100 includes nine power conversion circuit units. In the case where the power conversion device 100 is a 3-phase 2-parallel power conversion device, the power conversion device 100 includes six power conversion circuit units.

[0048] Structure of the first bus bar 2U to the sixth bus bar 3W

[0049] The first bus bar 2U to the sixth bus bar 3W are wiring members for input and output of current. The first bus bar 2U to the third bus bar 2W are input-side wiring members. The fourth bus bar 3U to the sixth bus bar 3W are output-side wiring members. As described later, in the case where the power conversion device 100 is applied to the control panel 200 for an elevator, the first bus bar 2U to the third bus bar 2W are main power source-side wiring members, and the fourth bus bar 3U to the sixth bus bar 3W are hoisting machine-side wiring members. In the present embodiment, the first bus bar 2U to the sixth bus bar 3W are arranged in the same plane.

[0050] In the present embodiment, the first bus bar 2U is arranged on only the side opposite the first cooling plate 4U with respect to the first phase unit group 1U. The first bus bar 2U is arranged in the same plane as the first phase unit group 1U on the side opposite the first cooling plate 4U. It is preferable that the first bus bar 2U be configured as a flat plate, in which case the mounting of the first bus bar 2U is easier than in the case where the first bus bar 2U is configured in three dimensions. It is preferable that the first bus bar 2U have a shape that is linearly symmetrical with respect to the second direction DR2.

[0051] The first bus bar 2U electrically connects the first phase first power conversion circuit unit 1U1 and the first phase second power conversion circuit unit 1U2. The first bus bar 2U electrically connects the first phase first power conversion circuit unit 1U1, the first phase second power conversion circuit unit 1U2, and the first phase third power conversion circuit unit 1U3 in parallel with one another.

[0052] The first bus bar 2U includes a first phase first connecting portion 2U1, a first phase second connecting portion 2U2, and a first phase third connecting portion 2U3. The first phase first connecting portion 2U1 is electrically connected to the first phase first power conversion circuit unit 1U1. The first phase second connecting portion 2U2 is electrically connected to the first phase first connecting portion 2U1. The first phase second connecting portion 2U2 is electrically connected to the first phase second power conversion circuit unit 1U2. The first phase third connecting portion 2U3 is electrically connected to the first phase second connecting portion 2U2. The first phase third connecting portion 2U3 is electrically connected to the first phase third power conversion circuit unit 1U3.

[0053] A first input-side terminal 2U0 is provided to the first bus bar 2U. An electric wire or bus bar connected to a component such as an input reactor is connected to the first input-side terminal 2U0. The shortest distance from the first input-side terminal 2U0 to the first phase first connecting portion 2U1 to the first input-side semiconductor module 1U11 and the shortest distance from the first input-side terminal 2U0 to the first phase third connecting portion 2U3 to the first phase third input-side semiconductor module 1U31 are longer than the shortest distance from the first input-side terminal 2U0 to the first phase second connecting portion 2U2 to the first phase second input-side semiconductor module 1U21. The first phase first connecting portion 2U1 and the first phase third connecting portion 2U3 have a larger dimension in the first direction DR1 than the first phase second connecting portion 2U2. As a result, the electrical resistance value from the first input-side terminal 2U0 to the first input-side semiconductor module 1U11, the electrical resistance value from the first input-side terminal 2U0 to the first phase second input-side semiconductor module 1U21, and the electrical resistance value from the first input-side terminal 2U0 to the first phase third input-side semiconductor module 1U31 can be equal to one another.

[0054] The 2nd bus bar 2V, the 3rd bus bar 2W, the 4th bus bar 3U, the 5th bus bar 3V, and the 6th bus bar 3W each also have the same structure as the 1st bus bar 2U.

[0055] The 2nd bus bar 2V electrically connects the 2nd phase 1st power conversion circuit unit IVI, the 2nd phase 2nd power conversion circuit unit IV2, and the 2nd phase 3rd power conversion circuit unit IV3 in parallel with each other, respectively. The 2nd bus bar 2V is disposed on the side opposite to the 2nd cooling plate 4V with respect to the 2nd phase unit group IV.

[0056] The 3rd bus bar 2W electrically connects the 3rd phase 1st power conversion circuit unit IWI, the 3rd phase 2nd power conversion circuit unit IWI, and the 3rd phase 3rd power conversion circuit unit IWI in parallel with each other, respectively. The 3rd bus bar 2W is disposed on the side opposite to the 3rd cooling plate 4W with respect to the 3rd phase unit group IWI.

[0057] The 4th bus bar 3U electrically connects the 1st phase 1st power conversion circuit unit IUI, the 1st phase 2nd power conversion circuit unit IUI, and the 3rd phase unit group IWI in parallel with each other on the output side. The 1st output side terminal 3U0 is provided to the 4th bus bar 3U.

[0058] The 5th bus bar 3V electrically connects the 2nd phase 1st power conversion circuit unit IVI, the 2nd phase 2nd power conversion circuit unit IV2, and the 2nd phase 3rd power conversion circuit unit IV3 in parallel with each other on the output side. The 6th bus bar 3W electrically connects the 3rd phase 1st power conversion circuit unit IWI, the 3rd phase 2nd power conversion circuit unit IWI, and the 3rd phase 3rd power conversion circuit unit IWI in parallel with each other on the output side.

[0059] In the present embodiment, the material of each bus bar is, for example, copper (Cu), aluminum (Al), brass, or an alloy thereof, or the like. They are sometimes subjected to plating treatment of tin, nickel, or the like, or the like, on the surface for the purpose of increasing the contact resistance value, increasing environmental resistance, or the like.

[0060] In addition, in the present embodiment, the 1st bus bar 2U to the 6th bus bar 3W are examples of wiring members for input and output of electric current. In the present embodiment, the wiring member is not limited to a bus bar, and can be an electric wire provided with a conductor and an insulator covering the conductor. The power conversion device 100 can be provided with a 1st electric wire to a 6th electric wire instead of the 1st bus bar 2U to the 6th bus bar 3W as the wiring member. The material constituting the conductor included in each electric wire is, for example, a metal material such as Cu, Al, or an alloy thereof. The material constituting the insulator included in each electric wire includes, for example, at least any one of a vinyl resin and a fluororesin.

[0061] 〈Structure of Conductor Part 5〉

[0062] The conductor portion 5 includes an intra-phase bus bar 51, an inter-phase bus bar 52, a first connection member 53, and a second connection member 54. The intra-phase bus bar 51 electrically connects the first-phase first power conversion circuit unit 1U1 and the first-phase second power conversion circuit unit 1U2. The intra-phase bus bar 51 electrically connects the first-phase third power conversion circuit unit 1U3 and the first-phase second power conversion circuit unit 1U2.

[0063] Specifically, the intra-phase bus bar 51 includes a first input-side intra-phase bus bar 511, a first-phase second input-side intra-phase bus bar 512, a first output-side intra-phase bus bar 513, and a first-phase second output-side intra-phase bus bar 514. The first input-side intra-phase bus bar 511 electrically connects the first input-side semiconductor module 1U11 and the first-phase second input-side semiconductor module 1U21. The first-phase second input-side intra-phase bus bar 512 electrically connects the first-phase third input-side semiconductor module 1U31 and the first-phase second input-side semiconductor module 1U21. The first output-side intra-phase bus bar 513 electrically connects the first output-side semiconductor module 1U12 and the first-phase second output-side semiconductor module 1U22. The first-phase second output-side intra-phase bus bar 514 electrically connects the first-phase third output-side semiconductor module 1U32 and the first-phase second output-side semiconductor module 1U22. Preferably, the first input-side intra-phase bus bar 511 has the same shape as the first-phase second input-side intra-phase bus bar 512. Preferably, the first output-side intra-phase bus bar 513 has the same shape as the first-phase second output-side intra-phase bus bar 514. Preferably, the first input-side intra-phase bus bar 511, the first-phase second input-side intra-phase bus bar 512, the first output-side intra-phase bus bar 513, and the first-phase second output-side intra-phase bus bar 514 have the same shape as each other.

[0064] The inter-phase bus bar 52 electrically connects the first-phase first power conversion circuit unit 1U1 and the first-phase second power conversion circuit unit 1U2 and the second-phase unit group 1V. The inter-phase bus bar 52 electrically connects the first-phase unit group 1U, the second-phase unit group 1V, and the third-phase unit group 1W to each other.

[0065] The phase-to-phase bus bar 52 includes an input-side phase-to-phase bus bar 521 and an output-side phase-to-phase bus bar 522. The input-side phase-to-phase bus bar 521 electrically connects the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W to each other at the input side. Thus, at the input side, the potentials of the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W are equal. The output-side phase-to-phase bus bar 522 electrically connects the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W to each other at the output side. Thus, at the output side, the potentials of the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W are equal. It is preferable that the input-side phase-to-phase bus bar 521 has the same shape as the output-side phase-to-phase bus bar 522.

[0066] The 1st connecting member 53 connects the 1st input-side phase-to-phase bus bar 511 and the 1st phase 2nd input-side phase-to-phase bus bar 512 to the input-side phase-to-phase bus bar 521. The 2nd connecting member 54 connects the 1st output-side phase-to-phase bus bar 513 and the 1st phase 2nd output-side phase-to-phase bus bar 514 to the output-side phase-to-phase bus bar 522. The 1st connecting member 53 and the 2nd connecting member 54 have a shape branched into three.

[0067] In the present embodiment, the material of the conductor portion 5 is, for example, copper (Cu), aluminum (Al), brass, or an alloy thereof, or the like. The size (length) of the 1st direction DR1 of the conductor portion 5 is, for example, 100 mm or more and 1000 mm or less. The shapes of the phase-to-phase bus bar 52 and the phase-to-phase bus bar 52 are not limited to straight lines. The phase-to-phase bus bar 52 and the phase-to-phase bus bar 52 can be bent as a whole or can be bent partially in consideration of the ease of installation in the control panel 200.

[0068] In the present embodiment, the phase-to-phase bus bar 52 and the phase-to-phase bus bar 52 included in the conductor portion 5 are an example of a wiring member for input and output of electric current. In the present embodiment, the wiring member included in the conductor portion 5 is not limited to a bus bar, and can be an electric wire provided with a conductor and an insulator covering the periphery of the conductor. In the power conversion device 100, the conductor portion 5 can be provided with a phase-to-phase electric wire and an interlayer electric wire instead of the phase-to-phase bus bar 52 and the phase-to-phase bus bar 52. The material constituting the conductor included in each electric wire is, for example, a metal material such as Cu, Al, or an alloy thereof. The material constituting the insulator included in each electric wire includes, for example, at least any one of a vinyl resin and a fluororesin.

[0069] In the present embodiment, the power conversion device 100 further includes a plurality of bolts 6 and nuts not shown. The plurality of bolts 6 are each disposed on the side opposite the first cooling plate 4U with respect to the conductor portion 5. The plurality of nuts are fixed, for example, by riveting processing. By the riveting processing, the ease of assembly (assemblability) and the ease of maintenance (maintainability) are improved. The conductor portion 5 is fixed to the first phase cell group 1U by the plurality of bolts 6 and the plurality of nuts. The intra-phase bus bars 51 are connected to the inter-phase bus bar 52 by the plurality of bolts 6 and the plurality of nuts. Further, instead of the nuts, grooves that can be fastened by the bolts 6 can be provided.

[0070] <Structure of the first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W>

[0071] The first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W are arranged along the first direction DR1. The first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W are partitioned from each other. The material of the first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W is, for example, aluminum (Al), copper (Cu), or iron (Fe), or the like.

[0072] The first cooling plate 4U is connected to the first phase cell group 1U. The first cooling plate 4U is disposed side by side with the first phase cell group 1U in the second direction DR2. The first cooling plate 4U has a first portion 4U1 disposed so as to overlap the first phase first power conversion circuit unit 1U1 in the second direction DR2, a second portion 4U2 disposed so as to overlap the first phase second power conversion circuit unit 1U2 in the second direction DR2, and a third portion 4U3 disposed so as to overlap the first phase third power conversion circuit unit 1U3 in the second direction DR2. In Figure 1 and Figure 2 In the first portion 4U1, the second portion 4U2, and the third portion 4U3 of the first cooling plate 4U, for example, the first portion 4U1, the second portion 4U2, and the third portion 4U3 are partitioned from each other. It is preferable that the first portion 4U1, the second portion 4U2, and the third portion 4U3 of the first cooling plate 4U have the same shape as each other. Further, the first portion 4U1, the second portion 4U2, and the third portion 4U3 of the first cooling plate 4U may, for example, also be integrated.

[0073] It is preferable that the first portion 4U1, the second portion 4U2, and the third portion 4U3 of the first cooling plate 4U of the first cooling plate 4U each be configured as a heat sink. As Figure 2As shown, the first part 4U1 of the first cooling plate 4U includes a base portion 41 and a plurality of fin portions 42. A first-phase first power conversion circuit unit 1U1 of the first-phase unit group 1U is connected to the base portion 41. The first-phase unit group 1U is fixed to the base portion 41, for example, by bolts. The base portion 41 is connected to the first-phase unit group 1U, for example, via heat dissipation grease or heat sinks. Thus, heat generated in the first-phase unit group 1U is diffused through the base portion 41. Heat pipes (not shown) may also be embedded in the base portion 41.

[0074] Multiple finned portions 42 protrude from the base portion 41 in the second direction DR2, facing the side opposite to the first phase unit group 1U. The base portion 41 and the multiple finned portions 42 can also be integrally formed. The multiple finned portions 42 can also be connected to the base portion 41 by riveting. (See fan 7 for reference.) Figure 1 Cooling air is delivered to multiple fin sections 42.

[0075] The first cooling plate 4U has three parts: a first input-side cooling section 4U1, a second part 4U2, and a third part 4U3, each including a first input-side cooling section 4U11 and a first output-side cooling section 4U12. The first input-side cooling section 4U11 is connected to the first input-side semiconductor module 1U11. The first output-side cooling section 4U12 is connected to the first output-side semiconductor module 1U12. In the figure, the first input-side cooling section 4U11 and the first output-side cooling section 4U12 are separate components, but they can also be integrated.

[0076] The first input-side cooling section 4U11 has a different size than the first output-side cooling section 4U12. The size of the second direction DR2 of the first-phase first cooling section is different from the size of the first-phase second cooling section. The sizes of the first-phase first cooling section and the first-phase second cooling section are determined based on the heat generated by the first input-side semiconductor module 1U11 and the first output-side semiconductor module 1U12. In this embodiment, the heat generated by the first input-side semiconductor module 1U11 is less than the heat generated by the first output-side semiconductor module 1U12; therefore, the size of the second direction DR2 of the first-phase first cooling section is smaller than the size of the second direction DR2 of the first-phase second cooling section. The first-phase first cooling section and the first-phase second cooling section may differ in size in the third direction DR3, or in the type of cooler.

[0077] The heat generated by the first input-side semiconductor module 1U11 and the first output-side semiconductor module 1U12 diffuses to the base portion 41 and the plurality of fin portions 42.

[0078] <Structure of the first fan 7U, the first airflow branch wind tunnel 81U, and the main wind tunnel 82>

[0079] like Figure 1 andFigure 3 The main air duct 82 is formed so as to surround the plurality of fin portions 42 of the first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W, respectively. The plurality of first air volume branch air ducts 81U are provided so as to guide the air sent from the plurality of fans 7 to the main air duct 82, respectively. The plurality of first air volume branch air ducts 81U are arranged between the plurality of fans 7 and the main air duct 82 in the third direction DR3. The plurality of first fans 7U and the plurality of first air volume branch air ducts 81U are arranged on one side of the first portion 4U1, the second portion 4U2, and the third portion 4U3 of the first cooling plate 4U in the third direction DR3, respectively. The plurality of first air volume branch air ducts 81U are connected to the main air duct 82, respectively.

[0080] The plurality of first air volume branch air ducts 81U are arranged side by side with each other in the first direction DR1. The plurality of first air volume branch air ducts 81U include a first air volume branch air duct 81U1, a first air volume branch air duct 81U2, and a first air volume branch air duct 81U3 arranged side by side with each other in the first direction DR1. The first air volume branch air duct 81U1, the first air volume branch air duct 81U2, and the first air volume branch air duct 81U3 are separated from each other. The first air volume branch air duct 81U1, the first air volume branch air duct 81U2, and the first air volume branch air duct 81U3 are partitioned from each other. It is preferable that the first air volume branch air duct 81U1, the first air volume branch air duct 81U2, and the first air volume branch air duct 81U3 have the same shape, respectively.

[0081] The first air volume branch air duct 81U1 is arranged on one side of the first portion 4U1 of the first cooling plate 4U in the third direction DR3. The first air volume branch air duct 81U2 is arranged on one side of the second portion 4U2 of the first cooling plate 4U in the third direction DR3. The first air volume branch air duct 81U3 is arranged on one side of the third portion 4U3 of the first cooling plate 4U in the third direction DR3.

[0082] A portion of the plurality of first fans 7U is arranged on the side opposite to the first portion 4U1 with respect to the first air volume branch air duct 81U1 in the third direction DR3. Another portion of the plurality of first fans 7U is arranged on the side opposite to the second portion 4U2 with respect to the first air volume branch air duct 81U2 in the third direction DR3. The remaining portion of the plurality of first fans 7U is arranged on the side opposite to the third portion 4U3 with respect to the first air volume branch air duct 81U3 in the third direction DR3. That is, the first air volume branch air duct 81U1 is arranged between the first portion 4U1 and the portion of the plurality of first fans 7U in the third direction DR3. The first air volume branch air duct 81U2 is arranged between the first portion 4U1 and the other portion of the plurality of first fans 7U in the third direction DR3. The first air volume branch air duct 81U3 is arranged between the third portion 4U3 and the remaining portion of the plurality of first fans 7U in the third direction DR3.

[0083] The projected area of ​​the first airflow branch wind tunnel 81U1 towards the third direction DR3 is greater than the sum of the projected areas of the first phase first power conversion circuit unit 1U1 and the first cooling plate 4U towards the third direction DR3.

[0084] like Figure 3 As shown, a first space SP1 is formed in the third direction DR3, relative to the first airflow branch wind tunnel 81U1, on the side of the first cooling plate 4U, and in the second direction DR2, relative to the first phase first power conversion circuit unit 1U1, on the side opposite to the first cooling plate 4U. The first space SP1 faces the surface SF1 of the first phase first power conversion circuit unit 1U1, which faces the side opposite to the first portion 4U1 of the first cooling plate 4U. The surface SF1 extends, for example, along the first direction DR1 and the third direction DR3. The projected area of ​​the first airflow branch wind tunnel 81U1 towards the third direction DR3 is equal to the sum of the projected areas of the first phase first power conversion circuit unit 1U1 and the first cooling plate 4U towards the third direction DR3 and the projected area of ​​the first space SP1.

[0085] like Figure 3 As shown, a first inlet 81a and a second inlet 81b are formed in the first airflow branch wind tunnel 81U1 for air to flow in from the first fan 7U. The first inlet 81a is arranged at a distance from the second inlet 81b in the second direction DR2.

[0086] Furthermore, the first airflow branch wind tunnel 81U1 has a first outlet 81c and a second outlet 81d for airflow from the first fan 7U to flow out.

[0087] like Figure 3 As shown, the first outlet 81c faces the interior space of the main wind tunnel 82. In the third direction DR3, at least a portion of the first outlet 81c is formed to overlap with the first portion 4U1 of the first cooling plate 4U. In the third direction DR3, at least a portion of the first outlet 81c is formed to overlap with the base portion 41 and the plurality of fin portions 42 of the first portion 4U1, respectively.

[0088] like Figure 3 As shown, the second outlet 81d faces the first space SP1. In the third direction DR3, at least a portion of the second outlet 81d is formed to overlap with the surface SF1 of the first phase first power conversion circuit unit 1U1 and the first space SP1 in the second direction DR2.

[0089] like Figure 3As shown, the first flow inlet 81a, the internal space of the first air volume branch wind tunnel 81U1, the first flow outlet 81c, and the internal space of the main wind tunnel 82 are connected in the third direction DR3. The second flow inlet 81b, the internal space of the first air volume branch wind tunnel 81U1, the second flow outlet 81d, and the first space SP1 are connected in the third direction DR3.

[0090] As shown, in a state in which the first fan 7U is driven, the first cooling air CA1 is formed to flow through the first flow inlet 81a, the internal space of the first air volume branch wind tunnel 81U1, the first flow outlet 81c, and the internal space of the main wind tunnel 82 in this order, and the second cooling air CA2 is formed to flow through the second flow inlet 81b, the internal space of the first air volume branch wind tunnel 81U1, the second flow outlet 81d, and the first space SP1 in this order. Figure 3 As shown, in a state in which the first fan 7U is driven, the first cooling air CA1 is formed to flow through the first flow inlet 81a, the internal space of the first air volume branch wind tunnel 81U1, the first flow outlet 81c, and the internal space of the main wind tunnel 82 in this order, and the second cooling air CA2 is formed to flow through the second flow inlet 81b, the internal space of the first air volume branch wind tunnel 81U1, the second flow outlet 81d, and the first space SP1 in this order.

[0091] Figure 3 As shown, the first air volume branch wind tunnel 81U1 has a plate portion (upper plate portion) disposed on one side and a plate portion (lower plate portion) disposed on the other side in the third direction DR3, and a pair of plate portions (side plate portions) disposed on one side and the other side in the first direction DR1. The first flow inlet 81a and the second flow inlet 81b are formed in the lower plate portion. The first flow outlet 81c and the second flow outlet 81d are formed in the upper plate portion. Figure 4 The first flow inlet 81a, the second flow inlet 81b, and the first flow outlet 81c are each constituted by, for example, one opening portion. The second flow outlet 81d is constituted by, for example, a plurality of opening portions. The plurality of opening portions are formed side by side at intervals from each other in the first direction DR1 and the second direction DR2, for example.

[0092] 〈Structure of Control Panel 200 for Elevator to Which Power Conversion Device 100 is Applied〉

[0093] As shown, the power conversion device 100 of the present embodiment is applied to, for example, a control panel 200 for an elevator. Although not shown, the elevator includes a car, the control panel 200 for an elevator, and a hoisting machine (motor). The car is configured to move within a hoistway. The control panel 200 for an elevator is disposed within the hoistway or a machine room provided near the hoistway.

[0094] Figure 5 As shown, in a state in which the first fan 7U is driven, the first cooling air CA1 is formed to flow through the first flow inlet 81a, the internal space of the first air volume branch wind tunnel 81U1, the first flow outlet 81c, and the internal space of the main wind tunnel 82 in this order, and the second cooling air CA2 is formed to flow through the second flow inlet 81b, the internal space of the first air volume branch wind tunnel 81U1, the second flow outlet 81d, and the first space SP1 in this order. Figure 6

[0095] ​​​The control panel 200 for an elevator includes the power conversion device 100, a housing 201, and a door 202. The power conversion device 100 is housed inside the housing 201. In the housing 201, a plurality of substrates, electrical equipment are provided in addition to the power conversion device 100. The door 202 is configured to be opened and closed with respect to the housing 201. The housing 201 has a ceiling 203 (wall portion). The ceiling 203 is provided so as to suppress intrusion of water and dust from above the housing 201 into the inside.

[0096] An exhaust port 204 that opens to a direction perpendicular to the third direction DR3 is formed in the housing 201. For example, an exhaust port 204 that opens to the first direction DR1 and an exhaust port 204 that opens to the second direction DR2 are formed in the housing 201. The exhaust port 204 is formed between the first cooling plate 4U and the ceiling 203 in the third direction DR3.

[0097] As shown in FIG. 1, in the inside of the housing 201, a first air passage AW1 that reaches the exhaust port 204 from a first flow outlet 81c of the first air volume branch air tunnel 81U1 via the first cooling plate 4U and a second air passage AW2 that reaches the exhaust port 204 from a second flow outlet 81d via the first space SP1 are formed. Figure 7

[0098] The first air passage AW1 includes the first flow inlet 81a, the inside space of the first air volume branch air tunnel 81U1, the first flow outlet 81c, and the inside space of the main air tunnel 82. The second air passage AW2 includes the second flow inlet 81b, the inside space of the first air volume branch air tunnel 81U1, the second flow outlet 81d, and the first space SP1.

[0099] As shown in FIG. 1, in a state in which the first fan 7U is driven, the first cooling air CA1 is formed in the first air passage AW1, and the second cooling air CA2 is formed in the second air passage AW2. The second air passage AW2 faces the surface SF1 of the first phase first power conversion circuit unit 1U1 of the first phase unit group 1U. Figure 7

[0100] In the power conversion device 100, the heat generated by the semiconductor modules included in the first phase unit group 1U is transferred to the first cooling air CA1 flowing in the first air passage AW1 via the fin portion 42 of the first cooling plate 4U (heat sink), and is transported to the outside of the exhaust port 204 by the first cooling air CA1. Also, the heat generated by the semiconductor modules included in the first phase unit group 1U is transferred to the second cooling air CA2 flowing in the second air passage AW2 facing the surface SF1 of the first phase first power conversion circuit unit 1U1 of the first phase unit group 1U, and is transported to the outside of the exhaust port 204 by the second cooling air CA2.

[0101] ​​It is preferable that the amount of the second cooling air CA2 be less than the amount of the first cooling air CA1.

[0102] The material constituting the air amount branching wind tunnel 81 can also be a metal material such as iron (Fe) or aluminum (Al), or a resin material such as ABS resin (polybutadiene grafted styrene-acrylonitrile copolymer).

[0103] The opening shape of the second flow outlet 81d can be any shape, such as a quadrangular shape or a circular shape. The ratio of the opening area of the second flow outlet 81d to the opening area of the first flow outlet 81c (the opening rate of the second flow outlet 81d) can be based on 50%. The opening rate can be arbitrarily set in a range of 20% or more and 80% or less, for example, so that the amount of the second cooling air CA2 satisfies a required value.

[0104] In Figure 1 , Figure 3 and Figure 4 , two of the first fan 7U, the second fan 7V, and the third fan 7W are provided for each of the power conversion circuit units, but the number of fans for each power conversion circuit unit can be arbitrarily set as long as the required amount of air is obtained.

[0105] The control panel 200 for an elevator is configured to receive three-phase alternating current from a main power source (commercial power source) or the like that supplies a building in which the elevator is installed. The control panel 200 for an elevator is configured to convert the received three-phase alternating current by the power conversion device 100. Thereby, a power waveform for driving a traction machine (motor) of the elevator is formed. The control panel 200 for an elevator is configured to return regenerative power generated in the traction machine to the commercial power source.

[0106] Figure 8 is a circuit diagram that shows a circuit structure of a main circuit portion of the power conversion device 100 for the control panel of an elevator. In Figure 8 , the structural elements of the first-phase first power conversion circuit unit 1U1 are surrounded by a dashed line. The structural elements of the first-phase second power conversion circuit unit 1U2 are surrounded by a single-dot chain line. The structural elements of the first-phase third power conversion circuit unit 1U3 are surrounded by a double-dot chain line.

[0107] The number of parallel connections of the power conversion device 100 is selected so as to be appropriate in accordance with the specifications of the power conversion device 100 and a load. In Figure 8 , the first-phase unit group 1U includes a main circuit having a pair of inverter circuits and a converter circuit.

[0108] The main power source PW is configured to supply three-phase alternating current to the traction machine M of the control panel for an elevator. The three-phase alternating current is supplied to the power conversion device 100 via the input reactor Rl. The power conversion device 100 is configured to convert the waveform of the three-phase alternating current inside by the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W.

[0109] In a case where the traction machine M operates by the three-phase alternating current of the main power source PW, the 1st phase 1st power conversion circuit unit 1Ul and the 1st phase 2nd power conversion circuit unit 1U2 function as a converter circuit and an inverter circuit, respectively. That is, in a case where the traction machine M operates by the three-phase alternating current of the main power source PW, the power conversion circuit unit on the input side and the power conversion circuit unit on the output side function as a converter circuit and an inverter circuit. The power conversion device 100 supplies the three-phase alternating current converted in each power conversion circuit unit to the traction machine via the output reactor R2.

[0110] In a case where the regenerative power generated from the traction machine M is returned to the main power source PW, the power conversion device 100 performs the operation opposite to the above. That is, in a case where the regenerative power generated from the traction machine M is returned to the main power source PW, the 1st phase 1st power conversion circuit unit 1Ul and the 1st phase 2nd power conversion circuit unit 1U2 function as an inverter circuit and a converter circuit, respectively. That is, in a case where the regenerative power generated from the traction machine is returned to the main power source, the power conversion circuit unit on the input side and the power conversion circuit unit on the output side function as an inverter circuit and a converter circuit. The power conversion device 100 returns the regenerative power generated from the traction machine M to the main power source PW via the input reactor Rl.

[0111] The 1st phase 1st capacitor 1U13, the 1st phase 2nd capacitor 1U23, and the 1st phase 3rd capacitor 1U33 are configured as smoothing capacitors. That is, the 1st phase 1st capacitor 1U13, the 1st phase 2nd capacitor 1U23, and the 1st phase 3rd capacitor 1U33 are configured to smooth the three-phase alternating current via the converter circuit.

[0112] Further, the input side electrodes of the capacitors of each of the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W are electrically connected to each other. The output side electrodes of the capacitors of each of the 1st phase unit group 1U, the 2nd phase unit group 1V, and the 3rd phase unit group 1W are electrically connected to each other. Thereby, each capacitor is held at the same potential.

[0113] In the present embodiment, each power conversion circuit unit of each phase unit group is provided on the back side of the control panel 200. That is, in the case of the U phase, the fin portion 42 side of the 1st cooling panel 4U is provided at a position opposite to the back side of the control panel.

[0114] <Modified example>

[0115] In the present embodiment, the first cooling plate 4U, the second cooling plate 4V, and the third cooling plate 4W can be integrated with each other.

[0116] In the present embodiment, the main air duct 82 can be partitioned for each power conversion circuit unit, like the plurality of first air volume branch air ducts 81U, the plurality of second air volume branch air ducts 81V, and the plurality of third air volume branch air ducts 81W. The main air duct 82 can be divided for each power conversion circuit unit. The fin portions 42 of the first portion 4U1, the second portion 4U2, and the third portion 4U3 of the first cooling plate 4U can each be surrounded by a different main air duct 82.

[0117] In the present embodiment, the power conversion device 100 in 3 parallel is mainly described, but the number of parallel of the power conversion device 100 can be appropriately determined. By appropriately combining the unit groups and the conductor portions 5, the power conversion device 100 in a structure other than 3 parallel can be realized. Thereby, the capacity of the power conversion device 100 can be appropriately determined. Further, the number of power conversion circuit units included in the power conversion device 100 increases by three for each increase in the number of parallel of the power conversion device 100. In the case where the number of parallel of the power conversion device 100 is 1 parallel, the number of power conversion circuit units is 3, in the case where the number of parallel is 2 parallel, the number of power conversion circuit units is 6, and in the case where the number of parallel is 3 parallel, the number of power conversion circuit units is 9.

[0118] In the present embodiment, the power conversion device 100 is applied to a control panel for an elevator, but the power conversion device 100 can be applied to a general-purpose inverter for an FA device or an inverter for an air conditioner or other uses.

[0119] <Effects of the power conversion device 100>

[0120] In the power conversion device 100, the first cooling plate 4U is disposed on the side opposite to the first bus bar 2U with respect to the first phase unit group 1U in the second direction DR2. That is, the first bus bar 2U is disposed on the side opposite to the first cooling plate 4U with respect to the first phase unit group 1U in the second direction DR2. Therefore, in the power conversion device 100, the size in the second direction DR2 can be made thinner compared to the power conversion device described in the above Patent Document 1.

[0121] Also, in the power conversion device 100, in the third direction DR3, at least a part of the first flow outlet 81c is formed so as to overlap the first cooling panel 4U, and at least a part of the second flow outlet 81d is formed so as to overlap the surface SF1 of the first phase first power conversion circuit unit 1U1 of the first phase unit group 1U and the first space SP1 facing the surface SF1. Therefore, in the power conversion device 100, as shown in Figure 3 and Figure 7 indicated, the heat rejection from the first phase unit group 1U and the first cooling panel 4U can be made efficient by the first cooling air CA1 and the second cooling air CA2. As a result, each component included in the first phase unit group 1U, the substrate connected to each component, and the reactor and the like can also be downsized.

[0122] In addition, in the power conversion device 100, even if compared with the comparative example of the power conversion device shown in Figure 9 , the heat rejection from the first phase unit group 1U and the first cooling panel 4U can be made efficient.

[0123] Figure 9 The comparative example shown in is different from the power conversion device 100 and the control panel 200 only in that the first air volume branch air tunnel 81U1 does not form the second flow outlet 81d.

[0124] Figure 9 In the comparative example shown in , the housing 201 also has a top plate 203. The exhaust air CA3 flowing out of the main air tunnel 82 in the third direction DR3 collides with a part of the region 203a of the top plate 203 overlapping the main air tunnel 82 in the third direction DR3. The exhaust port 204a formed in the housing 201 on the opposite side of the door 202 (the back side of the control panel 200) is closer to the part of the region 203a of the top plate 203 than the exhaust port 204b formed in the housing 201 on the side of the door 202 (the front side of the control panel 200).

[0125] Figure 9As shown, exhaust CA3, whose flow direction changes due to collision, easily reaches the exhaust port 204a in a portion of the area 203a near the top plate 203. On the other hand, exhaust CA3, whose flow direction changes, does not easily reach the exhaust port 204b in the portion of the area 203a away from the top plate 203. This is because, in the area of ​​the portion of the area 203a away from the top plate 203, exhaust CA3 is pushed back in the third direction DR3 in a direction away from the top plate 203 (downward). Exhaust CA4, pushed back in a direction away from the top plate 203, flows along the surface of the first phase first power conversion circuit unit 1U1 in the aforementioned first space, which may cause the temperature of the first phase first power conversion circuit unit 1U1 to rise. In addition, when exhaust CA4 reaches the intake side of the first fan 7, the temperature of the first cooling air CA1 delivered from the first fan 7 to the first air passage AW1 rises, and the first cooling plate 4U may not be sufficiently cooled.

[0126] To address the aforementioned issues, it is also possible to consider providing a wind tunnel that guides the exhaust gas flowing from the main wind tunnel 82 solely to the exhaust port 204a formed on the rear side of the housing 201. However, in such a structure, an exhaust path for the exhaust gas flowing from the exhaust port 204a needs to be provided on the rear side of the control panel 200, and sometimes it is difficult to ensure that there is a suitable location to provide such a control panel 200 and the aforementioned exhaust path.

[0127] Alternatively, to address the aforementioned issues, a wind tunnel could be constructed to guide the exhaust gas flowing from the main wind tunnel 82 to the exhaust port 204b formed on the front side of the housing 201. However, a typical control panel inside the housing 201 includes other equipment besides the power conversion device that is cooled by natural air cooling. Therefore, in such a structure, heat dissipation from these other devices would be hindered. Consequently, without a structure that provides heat dissipation for these other devices using methods other than natural air cooling, the aforementioned structure is difficult to implement.

[0128] In contrast, the power conversion device 100 of this embodiment can solve the above-mentioned problems and will not cause other problems as described above.

[0129] Specifically, such as Figure 7 As shown, according to the power conversion device 100, a second cooling air CA2 can be formed in the first space SP1. The second cooling air CA2 flows from the first airflow branch wind tunnel 81U toward the main wind tunnel 82 in the third direction DR3. Therefore, the second cooling air CA2 can prevent the generation of... Figure 9 The flow of exhaust CA4 is shown.

[0130] Implementation method 2.

[0131] Next, refer to Figure 10 andFigure 11 The structure of the power conversion device 101 of Embodiment 2 will be described. Embodiment 2 has the same structure and effects as those of the above-described Embodiment 1, unless specifically described otherwise. Therefore, the same reference numerals are assigned to the same structures as those of the above-described Embodiment 1, and the description will not be repeated.

[0132] The power conversion device 101 has one air amount branching wind tunnel 81 integrated regardless of the number of parallel connections. As shown in FIG. 1, in the case where the power conversion device 101 is a 3-phase 3-parallel connection power conversion device, the power conversion device 101 has one air amount branching wind tunnel 81 instead of the plurality of first air amount branching wind tunnels 81U, the plurality of second air amount branching wind tunnels 81V, and the plurality of third air amount branching wind tunnels 81W of the power conversion device 100. The air amount branching wind tunnel 81 has a structure in which the plurality of first air amount branching wind tunnels 81U, the plurality of second air amount branching wind tunnels 81V, and the plurality of third air amount branching wind tunnels 81W of the power conversion device 100 are integrated. Figure 10 The air amount branching wind tunnel 81 is disposed between the first cooling plate 4U and the plurality of first fans 7U, between the second cooling plate 4V and the second fan 7V, and between the third cooling plate 4W and the third fan 7W in the third direction DR3. The third flow outlet, the fourth flow outlet, the fifth flow outlet, and the sixth flow outlet are formed in the air amount branching wind tunnel 81.

[0133] The third flow outlet and the fifth flow outlet have the same structure as the first flow outlet 81c of the first air amount branching wind tunnel 81U of the power conversion device 100. At least a part of the third flow outlet is formed to overlap the second cooling plate 4V in the third direction DR3. At least a part of the fifth flow outlet is formed to overlap the third cooling plate 4W in the third direction DR3.

[0134] The fourth flow outlet and the sixth flow outlet have the same structure as the second flow outlet 81d of the first air amount branching wind tunnel 81U of the power conversion device 100. At least a part of the fourth flow outlet is formed to overlap the second space on the opposite side of the second bus bar 2V from the second cooling plate 4V in the second direction DR2. At least a part of the sixth flow outlet is formed to overlap the third space on the opposite side of the third bus bar 2W from the third cooling plate 4W in the second direction DR2. The second space and the third space are connected to the above-described first space SP1 in the first direction DR1.

[0135] The air amount branching wind tunnel 81 is configured as one component. Alternatively, the air amount branching wind tunnel 81 can be configured by joining a plurality of components to each other.

[0136] In the case where the power conversion device 101 is a 3-phase 3-parallel connection power conversion device, the power conversion device 101 has one air amount branching wind tunnel 81 instead of the plurality of first air amount branching wind tunnels 81U, the plurality of second air amount branching wind tunnels 81V, and the plurality of third air amount branching wind tunnels 81W of the power conversion device 100. The air amount branching wind tunnel 81 has a structure in which the plurality of first air amount branching wind tunnels 81U, the plurality of second air amount branching wind tunnels 81V, and the plurality of third air amount branching wind tunnels 81W of the power conversion device 100 are integrated.

[0137] Figure 10 ​In the power conversion device 101 shown, two fans are provided for each power conversion circuit unit.

[0138] On the other hand, in the power conversion device 101, the first fan 7U, the second fan 7V, and the third fan 7W are not provided for each power conversion circuit unit. The number and arrangement of the fans of the power conversion device 101 can be arbitrarily set according to the cooling performance required as a whole of the power conversion device 101.

[0139] Figure 11 is a plan view showing an example of the number and arrangement of the fans in the power conversion device 101. Figure 10 A plan view of the power conversion device 101 shown in which the number of fans is 14. In the power conversion device 101 shown in Figure 10 In the power conversion device 101 shown, the first phase unit group 1U, the second phase unit group 1V, and the third phase unit group 1W are arranged side by side in the first direction DR1, and therefore, heat is easily concentrated in the central portion of the first direction DR1 compared to the both end portions in the first direction DR1. Therefore, the number of the second fans 7V arranged in the central portion of the first direction DR1 is larger than the number of each of the first fans 7U and the third fans 7W arranged in the both end portions of the first direction DR1. Further, in the power conversion device 101 shown in Figure 11 In the power conversion device 101 shown, the number of the first fans 7U and the third fans 7W is reduced compared to Figure 10 In the power conversion device 101 shown, the number of the first fans 7U and the third fans 7W is reduced compared to

[0140] Further, the power conversion device 101 can be deformed similarly to the power conversion device 100. In the power conversion device 101, each bus bar can also be replaced with an electric wire.

[0141] Embodiment 3.

[0142] Next, the structure of the power conversion device of Embodiment 3 will be described with reference to Figure 12 The structure of the power conversion device of Embodiment 3 will be described. Embodiment 3 has the same structure and effects as those of the above-described Embodiment 1, unless specifically described otherwise. Therefore, the same reference numerals are assigned to the same structures as those of the above-described Embodiment 1, and the description will not be repeated.

[0143] As described above, in the power conversion device of Embodiment 3, the number of the first fans 7U and the third fans 7W is reduced compared to Figure 12As shown, the power conversion device of the present embodiment further includes a partition member 84. The partition member 84 is installed inside the first air amount branch air duct 81U1 to separate a first internal space SP3 of the first air amount branch air duct 81U1 connected to the first flow outlet 81c and a second internal space SP4 of the first air amount branch air duct 81U1 connected to the second flow outlet 81d. The partition member 84 functions as an air amount adjustment plate that adjusts the air amount of the first cooling air CA1 flowing from the first flow outlet 81c to the main air duct and the air amount of the second cooling air CA2 flowing from the second flow outlet 81d to the first space SP1. The partition member 84 can be fixed to the first air amount branch air duct 81U in a detachable manner. It is preferable that the width of the first direction DR1 of the partition member 84 be equal to the width of the first direction DR1 inside the first air amount branch air duct 81U.

[0144] The partition member 84 has a downstream side portion 84a and an upstream side portion 84b. The downstream side portion 84a is disposed at a position downstream of the upstream side portion 84b in the flow direction of the first cooling air CA1 and the second cooling air CA2. The downstream side portion 84a is fixed to a portion of the first air amount branch air duct 81U between the first flow outlet 81c and the second flow outlet 81d. The method of fixing the downstream side portion 84a to the first air amount branch air duct 81U is not particularly limited, and is, for example, a method based on fastening by bolts, adhesion, or welding. The downstream side portion 84a extends along the third direction DR3.

[0145] The upstream side portion 84b is connected to the downstream side portion 84a in the third direction DR3 and is disposed at a position closer to the first fan 7U side than the downstream side portion 84a in the third direction DR3. The upstream side portion 84b is inclined with respect to the downstream side portion 84a. In a cross section perpendicular to the first direction DR1, the cross-sectional shape of the partition member 84 is, for example, a k-shaped cross-sectional shape.

[0146] It is preferable that the partition member 84 be configured so that the air amount of the first cooling air CA1 is greater than the air amount of the second cooling air CA2. It is preferable that the upstream side portion 84b be inclined with respect to the downstream side portion 84a in such a manner that the cross-sectional area of the first internal space perpendicular to the third direction DR3 gradually increases as it moves away from the downstream side portion 84a.

[0147] The smaller the angle θ at which the upstream side portion 84b is inclined with respect to the downstream side portion 84a and the longer the length L of the extension direction of the upstream side portion 84b, the higher the ratio of the air amount of the first cooling air CA1 to the air amount of the second cooling air CA2. The angle θ and the length L of the partition member 84 can be appropriately adjusted within a range that does not interfere with the first air amount branch air duct 81U. In the present embodiment, the angle θ is 45 degrees and the length L is 100 mm. Figure 12In the first air volume branch wind tunnel 81U1, the partition member 84 is buffered against the first air volume branch wind tunnel 81U when the angle is less than 90 degrees, and the angle is 90 degrees or more.

[0148] In the power conversion device, as the operation specifications of the power conversion circuit units or the operation specifications of the mounting members within the control panel 200 are changed, it is sometimes necessary to adjust the air volume ratio of each of the first cooling air CA1 and the second cooling air CA2. Even in such a case, according to the power conversion device of the present embodiment, the adjustment of the air volume ratio can be performed by changing only the partition member 84 without changing the first flow outlet 81c and the second flow outlet 81d of the air volume branch wind tunnel 81.

[0149] Further, Figure 12 The partition member 84 illustrated in the drawing is composed of a downstream side portion 84a and an upstream side portion 84b, but the partition member 84 can also include a portion other than the downstream side portion 84a and the upstream side portion 84b.

[0150] The cross-sectional shape of the partition member 84 is not limited to the k-shape, and can be arbitrarily set as long as the above-described function is achieved. In addition, an opening portion that communicates the first internal space SP3 and the second internal space SP4 can be formed in the partition member 84. The number of opening portions, the opening area of the opening portions, and the position of the opening portions can be arbitrarily set.

[0151] The material that constitutes the partition member 84 can be a metal material such as iron (Fe) or aluminum (Al), or a resin material such as ABS resin. The material that constitutes the partition member 84 can be the same as the material that constitutes the first air volume branch wind tunnel 81U.

[0152] Further, the power conversion device of the embodiment 3 can be deformed similarly to the power conversion device 100. In the power conversion device of the embodiment 3, each bus bar can also be replaced with an electric wire. In addition, the power conversion device of the present embodiment can have the same structure as the power conversion device 101 of the embodiment 2 except for the provision of the partition member 84. In this case, the power conversion device of the embodiment 3 can be deformed similarly to the power conversion device 101.

[0153] Embodiment 4.

[0154] Next, the structure of the power conversion device of the embodiment 4 will be described with reference to Figure 13 and Figure 14 . The embodiment 3 has the same structure and effects as the above-described embodiment 1 as long as there is no particular description. Therefore, the same reference numerals are attached to the same structures as the above-described embodiment 1, and the description will not be repeated.

[0155] AsFigure 13 and Figure 14 As shown in FIG. 8, the power conversion device 104 of the present embodiment further includes at least one air guide member 85. The air guide member 85 guides the second cooling air CA2 flowing out of the second flow outlet 81d toward the first-phase first power conversion circuit unit 1U1. The air guide member 85 is configured so that the cross-sectional area of the flow path of the second cooling air CA2 at a position located downstream of the second flow outlet 81d in the flow direction of the second cooling air CA2 is smaller than the opening area of the second flow outlet 81d. The air guide member 85 concentrates the second cooling air CA2 toward the first-phase first power conversion circuit unit 1U1.

[0156] The air guide member 85 has a portion that is arranged apart from the second flow outlet 81d in the third direction DR3 and overlaps at least a part of the second flow outlet 81d in the third direction DR3. The air guide member 85 has a downstream side end portion 85b arranged at the most downstream position in the flow direction of the second cooling air CA2. The downstream side end portion 85b is arranged so as to overlap the second flow outlet 81d in the third direction DR3.

[0157] The air guide member 85 has an upstream side portion 85a and a downstream side portion 85b. The downstream side portion 85b is arranged at a position located downstream of the upstream side portion 85a in the flow direction of the second cooling air CA2. The downstream side portion 85b is continuous with the upstream side portion 85a in the third direction DR3 and is arranged at a position located on the first-phase first power conversion circuit unit 1U1 side of the upstream side portion 85a in the third direction DR3. The downstream side portion 85b is inclined with respect to the third direction DR3.

[0158] The upstream side portion 85a is arranged outside the first air volume branch air tunnel 81U1. The upstream side portion 85a is mounted, for example, on the side opposite the first-phase first power conversion circuit unit 1U1 with respect to the second flow outlet 81d. The method of fixing the air guide member 85 to the first air volume branch air tunnel 81U is not particularly limited and is, for example, a method based on fastening by a bolt and nut, adhesion, or welding. Instead of a nut, a threaded hole formed by flanging and threading processing of the first air volume branch air tunnel 81U can also be used.

[0159] In the power conversion device of the present embodiment, the second cooling air CA2 flowing out of the second flow outlet 81d toward the first space SP1 is concentrated toward the first-phase first power conversion circuit unit 1U1 by the air guide member 85, and the wind speed of the second cooling air CA2 increases. As a result, the cooling efficiency of the first-phase first power conversion circuit unit 1U1 is improved by the second cooling air CA2 having an increased wind speed.

[0160] Further, the air guide member 85 can also be provided so as to make the air direction of the second cooling air CA2 flowing out from the second flow outlet 81d toward the side of the components other than the first phase first power conversion circuit unit 1U1 which needs to be cooled. For example, referring to Figure 6 In a case where the components which need to be cooled, such as a substrate, are arranged on the door 202 side within the housing 201, the air guide member 85 can also be installed on the first phase first power conversion circuit unit 1U1 side with respect to the second flow outlet 81d, and provided so as to make the second cooling air CA2 flow toward such components.

[0161] The material constituting the air guide member 85 can also be a metal material such as iron (Fe) or aluminum (Al), or a resin material such as ABS resin.

[0162] Further, the power conversion device of Embodiment 4 can be deformed similarly to the power conversion device 100. In the power conversion device of Embodiment 4, each bus bar can also be replaced with an electric wire. In addition, the power conversion device of Embodiment 4 can have the same structure as the power conversion device 101 of Embodiment 2 except for the point that the air guide member 85 is provided. In this case, the power conversion device of Embodiment 4 can be deformed similarly to the power conversion device 101.

[0163] Embodiment 5.

[0164] Next, the structure of the control panel of Embodiment 5 will be described with reference to Figure 15 and Figure 16 Embodiment 5 has the same structure and effects as those of Embodiment 1 described above, unless otherwise specified. Therefore, the same reference numerals are attached to the same structures as those of Embodiment 1 described above, and the description will not be repeated.

[0165] As shown in Figure 15 and Figure 16 , the control panel 200 of the present embodiment further has at least one air path suppression member 86.

[0166] The air path suppression member 86 is provided so as to concentrate the second cooling air CA2 flowing within the first space SP1 of the power conversion device of the present embodiment on the first phase first power conversion circuit unit 1U1 side. The air path suppression member 86 is provided so as to narrow the width of the second direction DR2 of the first space SP1.

[0167] In a cross section perpendicular to the first direction DR1, the shape of the outer surface of the air path suppression member 86 is, for example, trapezoidal. The air path suppression member 86 is formed, for example, by bending processing of a plate-shaped member. The air path suppression member 86 has, for example, a first inclined portion 86a, an opposing portion 86b, and a second inclined portion 86c.

[0168] The first inclined portion 86a and the second inclined portion 86c are inclined relative to the third direction DR3. The first inclined portion 86a is arranged such that it gradually approaches the first phase first power conversion circuit unit 1U1 side in the second direction DR2 as it moves away from the second outlet 81d in the third direction DR3. The first inclined portion 86a has an end in the third direction DR3 that is closest to the second outlet 81d and an end in the third direction DR3 that is furthest from the second outlet 81d. The end of the first inclined portion 86a that is closest to the second outlet 81d in the third direction DR3 is fixed to the door 202, for example. The end of the first inclined portion 86a that is furthest from the second outlet 81d in the third direction DR3 is connected to the end of the opposing portion 86b that is closest to the second outlet 81d in the third direction DR3.

[0169] The opposing portion 86b extends along the third direction DR3 and is opposite to the first phase first power conversion circuit unit 1U1 in the second direction DR2. The interior angles formed by the first inclined portion 86a and the second inclined portion 86c with the opposing portion 86b are, for example, obtuse angles.

[0170] The second inclined portion 86c is arranged such that it moves further away from the second outlet 81d in the third direction DR3 and further away from the first phase first power conversion circuit unit 1U1 side in the second direction DR2. The second inclined portion 86c has an end in the third direction DR3 closest to the second outlet 81d and an end in the third direction DR3 furthest from the second outlet 81d. The end of the second inclined portion 86c furthest from the second outlet 81d in the third direction DR3 is, for example, mounted on the inner surface of the door 202. The end of the second inclined portion 86c furthest from the second outlet 81d in the third direction DR3 is connected to the end of the opposing portion 86b furthest from the second outlet 81d in the third direction DR3.

[0171] Furthermore, the shape of the outer surface of the airflow suppression member 86 in the section perpendicular to the first direction DR1 is not limited to a trapezoidal shape. The first inclined portion 86a and the second inclined portion 86c may also be perpendicular to the third direction DR3. The interior angles formed by the first inclined portion 86a and the second inclined portion 86c with the opposing portion 86b may also be 90°. The airflow suppression member 86 may also be formed, for example, by performing a cap-shaped bending process on a plate-shaped member.

[0172] like Figure 16 As shown, the control panel of this embodiment may also include multiple airflow suppression components 86. These multiple airflow suppression components 86 are arranged side-by-side, for example, in the first direction DR1. Figure 16In the case where the control panel of the present embodiment is provided with a plurality of doors 202, one air passage suppression member 86 can be installed in each of the plurality of doors 202. A plurality of air passage suppression members 86 can be installed in each of the plurality of doors 202. The number of air passage suppression members 86 can be the same as or different from the number of doors 202. It is preferable that the number of air passage suppression members 86 be equal to or more than the number of doors 202. In the case where the number of doors 202 is one, one or more air passage suppression members 86 can be installed in the one door 202.

[0173] The method of fixing the air passage suppression member 86 to the door 202 is not particularly limited, and is, for example, a method based on fastening by a bolt and a nut, adhesion, or welding. Instead of a nut, a threaded hole formed by flanging and threading processing of the door 202 can be used.

[0174] In the control panel of the present embodiment, by the air passage suppression member 86, the second cooling air CA2 flowing from the second flow outlet 81d toward the first space SP1 in the power conversion device of the present embodiment is concentrated toward the first phase first power conversion circuit unit 1U1, and the wind speed of the second cooling air CA2 increases. As a result, the cooling efficiency of the first phase first power conversion circuit unit 1U1 is improved by the second cooling air CA2 having the increased wind speed.

[0175] The air passage suppression member 86 having the opposing portion 86b can concentrate the second cooling air CA2 in the vicinity of the first phase first power conversion circuit unit 1U1 in a wider region in the third direction DR3 than the air guide member 85 in Embodiment 4. As a result, in the control panel of the present embodiment, by the air passage suppression member 86, the cooling efficiency of the portion of the first phase first power conversion circuit unit 1U1 that is away from the second flow outlet 81d is also improved.

[0176] The material constituting the air passage suppression member 86 can be a metal material such as iron (Fe) or aluminum (Al), or a resin material such as ABS resin.

[0177] Further, the power conversion device of Embodiment 5 can be deformed similarly to the power conversion device 100. In the power conversion device of Embodiment 5, each bus bar can be replaced with a wire. In addition, the power conversion device of Embodiment 5 can have the same structure as the power conversion device 101 of Embodiment 2 except for the provision of the air passage suppression member 86. In this case, the power conversion device of Embodiment 5 can be deformed similarly to the power conversion device 101.

[0178] The embodiments disclosed this time should be considered illustrative and not restrictive. The scope of the disclosure is not represented by the above description but by the claims, and intended to include all modifications within the meaning and scope equivalent to the claims.

[0179] Explanation of Reference Numerals

[0180] 1U: 1st phase unit group; 1U1: 1st power conversion circuit unit of 1st phase; 1U2: 2nd power conversion circuit unit of 1st phase; 1U11: 1st input side semiconductor module; 1U12: 1st output side semiconductor module; 1U13: 1st capacitor of 1st phase; 1V: 2nd phase unit group; 1V1: 1st power conversion circuit unit of 2nd phase; 1V2: 2nd power conversion circuit unit of 2nd phase; 2U: 1st bus bar; 2U1: 1st connecting portion of 1st phase; 2U2: 2nd connecting portion of 1st phase; 2U9: 1st bent portion; 2V: 2nd bus bar; 2V1: 1st connecting portion of 2nd phase; 2V2: 2nd connecting portion of 2nd phase; 4U: 1st cooling plate; 4U11: 1st input side cooling portion; 4U12: 1st input side cooling portion; 5: conductor portion; 5P: printed board; 51: intra-phase bus bar; 52: inter-phase bus bar; 6: bolt; 7: fan; 7U: 1st fan; 7V: 2nd fan; 7W: 3rd fan; 81: air volume branch wind tunnel; 81U, 81U1, 81U2, 81U3: 1st air volume branch wind tunnel; 81V: 2nd air volume branch wind tunnel; 81W: 3rd air volume branch wind tunnel; 81a: 1st flow inlet; 81b: 2nd flow inlet; 81c: 1st flow outlet; 81d: 2nd flow outlet; 82: main wind tunnel; 84: partition member; 84a: downstream side portion; 84b: upstream side portion; 85: wind direction changing plate; 86: wind path suppressing plate; 100, 101: power conversion device; 200: control panel; 201: housing; 202: door; 203: top plate; 203a: partial region; 204, 204a, 204b: exhaust port; 511: 1st input side intra-phase bus bar; 512: 2nd input side intra-phase bus bar; 513: 1st output side intra-phase bus bar; 514: 2nd output side intra-phase bus bar; 521: input side inter-phase bus bar; 522: output side inter-phase bus bar.

Claims

1. A power conversion device comprising a first phase unit group, a first cooling plate, a first air volume branch air duct, and a first fan, the first phase unit group including a first phase first power conversion circuit unit and a first phase second power conversion circuit unit configured adjacent to each other in a first direction, the first phase first power conversion circuit unit and the first phase second power conversion circuit unit being electrically connected in parallel to each other, the first cooling plate being connected to the first phase unit group and being configured side by side with the first phase unit group in a second direction perpendicular to the first direction, the first air volume branch air duct being configured between the first cooling plate and the first fan in a third direction perpendicular to the first direction and the second direction, a first flow outlet and a second flow outlet through which air sent from the first fan flows being formed in the first air volume branch air duct, in the third direction, the first flow outlet being formed so as to overlap the first cooling plate, in the third direction, the second flow outlet being formed so as to overlap a surface of the first phase unit group facing a first space on an opposite side of the first cooling plate in the second direction.

2. The power conversion device according to claim 1, wherein the power conversion device further comprises: a first wiring member electrically connecting the first phase first power conversion circuit unit and the first phase second power conversion circuit unit in parallel; a second phase unit group including a second phase first power conversion circuit unit configured adjacent to the first phase unit group along the first direction, and a second phase second power conversion circuit unit configured on an opposite side of the first phase unit group with respect to the second phase first power conversion circuit unit along the first direction; a second wiring member electrically connecting the second phase first power conversion circuit unit and the second phase second power conversion circuit unit in parallel; and a second cooling plate connected to the second phase unit group, the first cooling plate being configured on a side opposite to the first wiring member with respect to the first phase unit group in the second direction, the first air volume branch air duct being configured between the first cooling plate and the second cooling plate and the first fan in the third direction, a third flow outlet and a fourth flow outlet through which air sent from the first fan flows being further formed in the first air volume branch air duct, in the third direction, the third flow outlet being formed so as to overlap the second cooling plate, in the third direction, the fourth flow outlet being formed so as to overlap a second space on an opposite side of the second cooling plate with respect to the second wiring member in the second direction.

3. The power conversion device according to claim 1 or 2, wherein the power conversion device further comprises a partition member detachably installed inside the first air volume branch air duct, partitioning a first internal space of the first air volume branch air duct connected to the first flow outlet and a second internal space of the first air volume branch air duct connected to the second flow outlet.

4. The power conversion device according to claim 3, wherein, The separating component has: a downstream portion installed between the first flow outlet and the second flow outlet; and an upstream portion connected to the downstream portion in the third direction, and disposed in the third direction at a position closer to the first fan side than the downstream portion. The upstream portion is inclined relative to the downstream portion.

5. The power conversion device according to claim 4, wherein, The upstream portion is inclined relative to the downstream portion in such a way that the cross-sectional area of ​​the first internal space perpendicular to the third direction gradually increases as it moves away from the downstream portion in the third direction.

6. The power conversion device according to any one of claims 1 to 5, wherein, The power conversion device also includes an air guiding component fixed to the outside of the first airflow branch wind tunnel. The air guide component is configured to guide the air flowing out of the second outlet to the first phase unit group.

7. An elevator control panel for controlling the elevator's traction machine, wherein, The elevator control panel includes: The power conversion device according to any one of claims 1 to 6; and A housing that internally houses the power conversion device. The housing has a wall portion disposed in the third direction relative to the first cooling plate on the side opposite to the first airflow branch wind tunnel, and configured to overlap with the first cooling plate and the first space in the third direction. An exhaust port that opens in a direction perpendicular to the third direction is formed between the first cooling plate and the wall portion on the housing. Inside the housing, a first air passage is formed from the first outlet via the first cooling plate to the exhaust port, and a second air passage is formed from the second outlet via the first space to the exhaust port.

8. The elevator control panel according to claim 7, wherein, The elevator control panel also features: A door that opens and closes relative to the housing; and An airflow suppression component, which is fixed to the door. The airflow suppression component is configured to narrow the width of the first space in the second direction.

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