JP7310593B2 - power converter - Google Patents

Description

The disclosure provided herein relates to a power converter with a connector.

The power conversion device described in Patent Literature 1 has a main body case that accommodates the main body of the device, a main body cover, and a connector. The body cover closes the body opening of the body case.

JP 2015-97164 A

The connector is attached to the side wall of the body case that defines the body opening. The connector is electrically connected to the main body of the apparatus, and is electrically connected to the power supply via the power supply wiring.

The power wiring extends away from the main body case and is not opposed to the main body cover. Therefore, the main body cover can be removed from the main body case even if the power wiring is not removed from the connector.

If the main body cover is removed from the main body case while power is being supplied to the main body, there is a risk that current will flow to the user if the user touches the main body of the device exposed from the main body case.

Therefore, an object of the disclosure described in this specification is to provide a power conversion device that suppresses the flow of current to the user even if the user touches an electrical component exposed from the case.

One of the disclosures is
an electrical component (310, 520) comprising a plurality of switches (511, 512);
a case (700) having a storage space for storing electrical components, and a first communication hole (791) and a second communication hole (792) for communicating between the storage space and the outside of the storage space;
a first connection portion (610) provided in the first communication hole, coupled to the case and connected to the electrical component;
a cover (800) connected to the case in such a manner as to close the second communication hole;
a second connection portion (620, 630) for connecting the electrical component and the power source via the first connection portion outside the storage space;
at least a portion of the second connecting portion faces the cover in the direction in which the case and the cover are arranged side by side ;
The cover has an annular portion (810) that is annular around the alignment direction,
A portion of the first connecting portion is passed through the hollow (811) of the annular portion .

According to the configuration of the present disclosure, when the second connection parts (620, 630) are removed from the first connection part (610), the cover (800) is removed from the case (700). When the second connection (620, 630) is removed from the first connection (610), the electrical component (310, 520) is de-energized. This unpowered electrical component (310, 520) is exposed from the case (700). Therefore, even if the user touches this electric component (310, 520), current flow to the user is suppressed.

It should be noted that the reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments described later, and do not limit the technical scope in any way.

It is an electric circuit representing an in-vehicle system. It is a top view of the power converter in a 1st embodiment. FIG. 3 is a top view of the power converter excluding the second connector and the cable shown in FIG. 2; 3 is a cross-sectional view taken along line IV-IV shown in FIG. 2; FIG. FIG. 3 is a cross-sectional view taken along line VV shown in FIG. 2; It is a sectional view for explaining a modification.

Embodiments will be described below with reference to the drawings.

(First embodiment)
First, based on FIG. 1, the vehicle-mounted system 100 provided with the power converter 300 will be described. This in-vehicle system 100 constitutes a system for an electric vehicle. The in-vehicle system 100 has a battery 200 , a power conversion device 300 , a motor 400 and a connector 600 .

In-vehicle system 100 also includes a plurality of ECUs (not shown). These multiple ECUs transmit and receive signals to and from each other via bus wiring. A plurality of ECUs cooperate to control the electric vehicle. A plurality of ECUs control regeneration and power running of motor 400 according to the SOC of battery 200 . SOC is an abbreviation for state of charge. ECU is an abbreviation for electronic control unit.

Battery 200 has a plurality of secondary batteries. These secondary batteries constitute a battery stack connected in series. The SOC of this battery stack corresponds to the SOC of battery 200 . A lithium-ion secondary battery, a nickel-hydrogen secondary battery, an organic radical battery, or the like can be used as the secondary battery.

<Power converter>
The power conversion device 300 has an inverter 500 . The power conversion device 300 converts power between the battery 200 and the motor 400 . Power conversion device 300 serves as inverter 500 and converts DC power of battery 200 into AC power via connector 600 . The power conversion device 300 serves as an inverter 500 to convert AC power generated by power generation (regeneration) of the motor 400 into DC power.

Motor 400 is connected to an output shaft of an electric vehicle (not shown). The rotational energy of motor 400 is transmitted to the running wheels of the electric vehicle via the output shaft. Conversely, the rotational energy of the running wheels is transmitted to motor 400 via the output shaft.

The motor 400 is driven by AC power supplied from the power converter 300 . As a result, a driving force is applied to the running wheels. Also, the motor 400 is regenerated by rotational energy transmitted from the running wheels. The AC power generated by this regeneration is converted into DC power by the power conversion device 300 . This DC power is supplied to battery 200 . The DC power is also supplied to various electrical loads mounted on the electric vehicle.

The inverter 500 includes semiconductor elements such as switches, which will be described later. In this embodiment, an n-channel IGBT is used as the switch. However, MOSFETs can be used instead of IGBTs for these switches. If a MOSFET is used as the switch, the diode may be omitted.

These switches can be made from semiconductors such as Si and wide-gap semiconductors such as SiC. The constituent material of the semiconductor element is not particularly limited.

<Inverter>
Inverter 500 has capacitor 310 and legs 510 . A first power supply bus bar 301 and a second power supply bus bar 302 are connected to the battery 200 . A first power supply bus bar 301 and a third power supply bus bar 303 are connected via a connector 600 . A second power supply bus bar 302 and a fourth power supply bus bar 304 are connected via a connector 600 .

A capacitor 310 and a leg group 510 are connected in parallel between the third power supply bus bar 303 and the fourth power supply bus bar 304 . Leg group 510 and motor 400 are connected via output bus bar 440 .

Leg group 510 has U-phase leg 513 , V-phase leg 514 , and W-phase leg 515 . Each of these three phase legs has two switches connected in series.

Each of the U-phase leg 513 to W-phase leg 515 has a high-side switch 511 and a low-side switch 512 as switches. Each of the U-phase leg 513 to W-phase leg 515 has a high-side diode 511a and a low-side diode 512a as diodes. The high side switch 511 and the low side switch 512 correspond to switches.

As shown in FIG. 1, the collector electrode of the high-side switch 511 is connected to the third power supply busbar 303 . An emitter electrode of the high side switch 511 and a collector electrode of the low side switch 512 are connected. An emitter electrode of the low-side switch 512 is connected to the fourth power supply busbar 304 . Thereby, the high side switch 511 and the low side switch 512 are serially connected in order from the third power feeding bus bar 303 toward the fourth power feeding bus bar 304 .

A switch module is configured by resin-sealing these switches with a resin member. A part of the collector terminal connected to the collector electrode of the high-side switch 511 is exposed from the resin member. A part of the emitter terminal connected to the emitter electrode of the low-side switch 512 is exposed from the resin member. Part of the gate terminals connected to the gate electrodes of the high-side switch 511 and the low-side switch 512 are exposed from the resin member.

In addition to these terminals, part of the output terminals connected to the emitter electrode of the high-side switch 511 and the collector electrode of the low-side switch 512 are partially exposed from the resin member.

A cathode electrode of a high side diode 511 a is connected to a collector electrode of the high side switch 511 . The emitter electrode of the high side switch 511 is connected to the anode electrode of the high side diode 511a. As a result, the high side diode 511 a is connected in anti-parallel to the high side switch 511 .

A cathode electrode of a low-side diode 512 a is connected to the collector electrode of the low-side switch 512 . An anode electrode of a low-side diode 512 a is connected to the emitter electrode of the low-side switch 512 . As a result, the low side diode 512 a is connected in anti-parallel to the low side switch 512 .

U-phase bus bar 410 is connected to a midpoint between high-side switch 511 and low-side switch 512 provided in U-phase leg 513 . U-phase bus bar 410 is connected to a U-phase stator coil of motor 400 .

A V-phase bus bar 420 is connected to the midpoint between the high-side switch 511 and the low-side switch 512 provided in the V-phase leg 514 . V-phase bus bar 420 is connected to a V-phase stator coil of motor 400 .

A W-phase bus bar 430 is connected to the midpoint between the high-side switch 511 and the low-side switch 512 provided on the W-phase leg 515 . W-phase bus bar 430 is connected to a W-phase stator coil of motor 400 .

When the motor 400 is powered, each of the high-side switch 511 and the low-side switch 512 provided in the leg group 510 is PWM-controlled by a control signal from the ECU. As a result, inverter 500 generates a three-phase alternating current. When the motor 400 generates (regenerates) power, the ECU stops outputting the control signal, for example. Accordingly, AC power generated by power generation of motor 400 passes through the diodes provided in three-phase leg group 510 . As a result, AC power is converted to DC power.

<Configuration of power converter>
Next, the configuration of the power converter 300 will be described. The three orthogonal directions are hereinafter referred to as the x direction, the y direction, and the z direction. The x and y directions correspond to orthogonal directions. The z direction corresponds to the alignment direction. Note that the z direction corresponds to a direction orthogonal to the vertical direction of the vehicle when the device is mounted on the vehicle.

As shown in FIGS. 2 to 5, the power converter 300 includes a case 700, a cover 800, a sealing member 900, a connecting bolt 910, a capacitor case 320, and a It has a cooler and a substrate. The power converter 300 also has a first connector 610 , a second connector 620 , and a cable 630 as components of the connector 600 .

Note that the sealing member 900 is a nonmetallic member such as rubber or resin. A connecting bolt 910 connects the cover 800 and the case 700 . The capacitor case 320 is a housing made of resin and accommodates the capacitor 310 described above. A conductive bus bar (not shown) connected to the capacitor 310 is exposed from the capacitor case 320 . A power module 520 is configured by stacking the switch modules described above in a cooler (not shown).

The connecting bolt 910 described above corresponds to a connecting member. The first connector 610 corresponds to the first connecting portion. The second connector 620 and the cable 630 correspond to the second connecting portion. Capacitor 310 and power module 520 are collectively referred to as electrical components as needed. The above components will be individually described below.

The case 700 includes a bottom portion 701 thin in the z-direction, side portions 702 annularly rising in the z-direction from the edge of an inner bottom surface 701a of the bottom portion 701, and an upper portion 710 connected to the tip of the side portion 702. have. The case 700 has a rectangular parallelepiped shape extending in the z-direction. A portion of the side portion 702 extending in the z-direction is omitted from FIGS.

A power module 520 , a capacitor case 320 , and a substrate (not shown) are housed in a storage space defined by a bottom portion 701 , side portions 702 and an upper portion 710 . The power module 520 is housed on the side of a third side wall 705, which will be described later. The capacitor case 320 is housed on the side of a first side wall 703, which will be described later.

Power module 520 and capacitor 310 are electrically connected via a bus bar (not shown). A substrate (not shown) is electrically connected to gate terminals and sensor terminals exposed from the switch module provided in the power module 520 .

Next, the form of case 700 will be described. A side portion 702 annularly erected in the z direction from an inner bottom surface 701a of the bottom portion 701 has a first side wall 703 and a third side wall 705 spaced apart from each other in the x direction, and a second side wall 705 spaced apart from each other in the y direction. It has a sidewall 704 and a fourth sidewall 706 . As shown in FIG. 3, the first sidewall 703, the second sidewall 704, the third sidewall 705, and the fourth sidewall 706 are annularly connected in a circumferential direction around the z-direction.

The upper portion 710 has a base 720 with a reduced thickness in the z-direction and a first perimeter 730, a second perimeter 740, and a protrusion 750 connected to the base 720, as shown in FIGS. The base 720 is formed with a first opening 760, a second opening 770, and a third opening 780 opening in the z-direction. These first to third openings 760 to 780 are arranged in the x-direction from the first side wall 703 toward the third side wall 705 in the order of the first opening 760, the third opening 780, and the second opening 770. . The third opening 780 corresponds to a third communication hole.

The first outer peripheral portion 730 is annularly connected to the outer peripheral edge of the storage space in the first opening 760 . A first communication hole 791 that communicates between the outside and the inside of the storage space is formed by arranging the hollow of the first outer peripheral portion 730 and the first opening 760 in the z-direction.

Similarly, the second outer peripheral portion 740 is annularly connected to the outer peripheral edge of the storage space in the second opening 770 . A second communication hole 792 that communicates between the outside and the inside of the storage space is formed by arranging the hollow of the second outer peripheral portion 740 and the second opening 770 in the z-direction.

A sealing member 900 is inserted into the third opening 780 so as to close the hollow of the third opening 780 . The sealing member 900 serves to prevent external dust and moisture from entering the case 700 .

As shown in FIG. 4, the projection 750 is connected to the exposed surface 720a of the base 720 outside the storage space and extends away from the exposed surface 720a in the z-direction. The protruding portion 750 is located between the first outer peripheral portion 730 and the second outer peripheral portion 740 in the x-direction. The projecting portion 750 is located closer to the first side wall 703 in the x direction than the third opening 780 into which the sealing member 900 is inserted. A projecting tip surface 750a at the tip of the projecting portion 750 is formed with a first bolt hole 751 recessed in the z direction toward the exposed surface 720a.

As shown in FIG. 4, the cover 800 has a thin plate-shaped cover main portion 801 made of metal material. The cover 800 is connected to the case 700 via connecting bolts 910 such that the cover main portion 801 faces the exposed surface 720a in the z-direction.

The cover main portion 801 is divided into the following three components having different distances in the z direction from the exposed surface 720a. A portion of the cover main portion 801 that faces the first outer peripheral portion 730 and the projecting portion 750 is referred to as a first main portion 810 . A portion of the cover main portion 801 facing the second outer peripheral portion 740 is indicated as a second main portion 820 . A portion of the cover main portion 801 that connects the first main portion 810 and the second main portion 820 and faces the third opening 780 into which the sealing member 900 is inserted is denoted as a third main portion 830 . First main portion 810 to third main portion 830 are arranged in the x direction from first side wall 703 to third side wall 705 in order of first main portion 810 , third main portion 830 and second main portion 820 .

A through hole 811 penetrating in the z direction is formed in the first main portion 810 at a portion facing the first communication hole 791 in the z direction. Therefore, the first main portion 810 has an annular shape forming an annular shape around the z-direction. A second bolt hole 812 opening in the z direction is formed at a portion of the first main portion 810 facing the first bolt hole 751 in the z direction. The first main portion 810 corresponds to the annular portion. The through hole 811 corresponds to the hollow of the annular portion.

The third main portion 830 connects the first main portion 810 and the second main portion 820 as described above. The separation distance in the z direction between the first connecting portion 831 connected to the first main portion 810 in the third main portion 830 and the base portion 720 is the second connecting portion 831 connected to the second main portion 820 in the third main portion 830 . It is longer than the separation distance between the portion 832 and the base portion 720 in the z direction. Therefore, the third main portion 830 extends in the x direction while bending in the z direction between the first main portion 810 and the second main portion 820 . In FIGS. 2 to 4, respective boundary lines are indicated by dashed-dotted lines.

The first connector 610 includes a plurality of metal first terminals (not shown) and a resin first covering portion 611 covering the plurality of first terminals. As shown in FIG. 4, the first covering portion 611 is mechanically connected to the first outer peripheral tip surface 730a of the first outer peripheral portion 730 on the side away from the exposed surface 720a in the z direction. One ends of the plurality of first terminals extend from the first covering portion 611 toward the housing space and are mechanically and electrically connected to a bus bar (not shown) of the capacitor 310 housed in the case 700 . The other ends of the plurality of first terminals extend in the z-direction from the first covering portion 611 toward the outside of the storage space.

The second connector 620 includes a plurality of metal second terminals (not shown) and a resin second covering portion 621 covering the plurality of second terminals. As shown in FIG. 4, the second covering portion 621 is mechanically connected to the first covering portion 611 in a fitted manner. Thereby, one ends of the plurality of second terminals are electrically connected to the other ends of the plurality of first terminals. The other ends of the multiple second terminals are electrically connected to the cable 630 .

The cable 630 is an insulated wire in which conductive wires are resin-sealed. One end of the cable 630 is mechanically and electrically connected to the other end of a plurality of second terminals (not shown) of the second connector 620, and the other end is connected to an external power supply. The extension form of the cable 630 connected between the other end of the second terminal and the external power source will be described later.

<Connection type>
As described above, the first main portion 810 has a through hole 811 penetrating in the z direction at a portion facing the first communication hole 791 in the z direction. As shown in FIG. 4, the first connector 610 connected to the first outer peripheral tip surface 730a is passed through the through hole 811. As shown in FIG. A portion of the first connector 610 passed through the through hole 811 is exposed in the z-direction from the through hole 811 so as to be separated from the first outer peripheral tip surface 730a.

A second bolt hole 812 opening in the z-direction is formed in the first main portion 810 at a position facing the first bolt hole 751 in the z-direction. A shaft portion of the connecting bolt 910 is passed through a communicating bolt hole in which the first bolt hole 751 and the second bolt hole 812 are aligned. The tip of the shaft portion of the connecting bolt 910 is fastened to the first bolt hole 751 , and the head portion of the connecting bolt 910 is pressed against the first main portion 810 . As a result, the first main portion 810 is sandwiched between the head portion of the connecting bolt 910 and the projecting portion 750 . As a result, the second main portion 820 is pressed against the second outer peripheral tip surface 740a. The second communication hole 792 is closed by the second main portion 820 .

The first main portion 810 of the cover main portion 801 exposes the first connector 610 through the through hole 811 . A second main portion 820 in the cover main portion 801 closes the second communication hole 792 . A third main portion 830 of the cover main portion 801 is mechanically connected to the projecting portion 750 via a connecting bolt 910 .

Note that the cover main portion 801 may be mechanically connected to the projecting portion 750 by a plurality of bolts (not shown) other than the connecting bolt 910 . In that case, a plurality of protrusions 750 may be formed. Alternatively, the cover main portion 801 may be directly connected to the base portion 720 by a plurality of bolts (not shown) without the projection portion 750 interposed therebetween. The portion of cover main portion 801 that is connected to base portion 720 with bolts is not limited to first main portion 810 .

A sealing member is provided between the second outer peripheral portion 740 and the second main portion 820 so that a gap is not formed between the second outer peripheral tip surface 740a and the inner surface 801a of the second main portion 820 on the side of the exposed surface 720a. may be interposed. This seal member may be interposed between the base portion 720 and the second main portion 820 . The cover 800 may be formed with a protrusion for interposing a sealing member.

<Second Outer Periphery and Flange>
As shown in FIGS. 4 and 5, the second perimeter 740 of the upper portion 710 has first and third edge walls 741 and 743 spaced apart from each other in the x direction and spaced apart from each other in the y direction. It has a second edge wall 742 and a fourth edge wall 744 . The first edge wall 741, the second edge wall 742, the third edge wall 743, and the fourth edge wall 744 are annularly connected in the circumferential direction around the z-direction. The first edge wall 741 is located on the first side wall 703 side, and the third edge wall 743 is located on the third side wall 705 side. The second edge wall 742 is located on the second side wall 704 side, and the fourth edge wall 744 is located on the fourth side wall 706 side. The second edge wall 742 corresponds to the first wall. The fourth edge wall 744 corresponds to the second wall.

As shown in FIGS. 4 and 5, the cover 800 is connected to the end of the second main portion 820 in addition to the first to third main portions 810 to 830, and extends toward the base portion 720 in the z direction. It has a first flange portion 821 , a second flange portion 822 and a third flange portion 823 that extend. The first flange portion 821 is connected to the end of the second main portion 820 on the side of the second side wall 704 . The second flange portion 822 is connected to the end of the second main portion 820 on the side of the third side wall 705 . The third flange portion 823 is connected to the end portion of the second main portion 820 on the side of the fourth side wall 706 . The first flange portion 821 corresponds to the first extending portion. The third flange portion 823 corresponds to the second extending portion.

As shown in FIG. 4, the second flange portion 822 faces the wall surface of the third edge wall 743 on the side away from the second communication hole 792 in the x direction. As shown in FIG. 5, the first flange portion 821 faces the wall surface of the second edge wall 742 on the side away from the second communication hole 792 in the y direction. The third flange portion 823 faces the wall surface of the fourth edge wall 744 on the side away from the second communication hole 792 in the y direction.

<First connector and second connector>
As shown in FIG. 4 , the first covering portion 611 of the first connector 610 has a connecting portion 612 connected to the first outer peripheral tip surface 730 a and an exposed portion 613 connected to the connecting portion 612 . The connecting portion 612 has a flat shape with a thin thickness in the z direction. The exposed portion 613 is connected to the connecting main surface 612a of the connecting portion 612 on the side away from the first outer peripheral end surface 730a in the z direction.

The exposed portion 613 extends away from the connecting main surface 612a in the z-direction. A portion of the exposed portion 613 passes through a through hole 811 formed in the first main portion 810 and is exposed from the through hole 811 . In FIG. 4, the boundary between the connecting portion 612 and the exposed portion 613 is indicated by a dashed line.

As shown in FIG. 4, the cross-sectional area orthogonal to the z-direction in the exposed portion 613 is smaller than the cross-sectional area orthogonal to the z-direction in the connecting portion 612 . The cross-sectional area of the through hole 811 orthogonal to the z-direction is smaller than the cross-sectional area of the first communication hole 791 orthogonal to the z-direction.

Second connector 620 is mechanically and electrically connected to first connector 610 in such a manner that the plurality of second terminals are electrically and mechanically connected to the plurality of first terminals as described above. A cross-sectional area orthogonal to the z-direction in the second covering portion 621 is larger than a cross-sectional area orthogonal to the z-direction in the through hole 811 . Therefore, part of the second covering portion 621 faces the first main portion 810 in the z direction. A part of the second covering portion 621 does not have to face the first main portion 810 in the z-direction.

<Cable>
As shown in FIG. 4, the cable 630 extends in the x direction toward the third side wall 705 with one end connected to a plurality of second terminals (not shown) of the second connector 620 . As shown in FIG. 4, the cable 630 faces the first main portion 810, the second main portion 820, and the third main portion 830 on the side of the outer surface 801b on the back surface of the inner surface 801a while being spaced apart in the z-direction.

Note that the cable 630 does not have to be spaced apart from the first main portion 810, the second main portion 820, and the third main portion 830 in the z-direction on the outer surface 801b side. Cable 630 may be routed along outer surface 801b. Furthermore, the cable 630 may be mechanically connected to the third side wall 705 or the like using a fixing member or the like. In this case, the distance in the z direction between the cable 630 and the outer surface 801b is less likely to fluctuate.

As shown in FIGS. 2 and 4, the cable 630 faces the head of the connecting bolt 910 while being spaced apart in the z-direction while extending toward the third side wall 705 in the x-direction. As shown in FIG. 4, the cable 630 faces the head of the connecting bolt 910 in the z direction on the side of the first outer peripheral portion 730 .

Cable 630 is mechanically coupled to second connector 620 as previously described. Therefore, the portion of the cable 630 on the first outer peripheral portion 730 side is more likely to be restrained from moving in the direction orthogonal to the z-direction than the portion of the cable 630 on the second outer peripheral portion 740 side. The head of the connecting bolt 910 is less likely to be exposed from the cable 630 .

The second covering portion 621 of the second connector 620 may face the head of the connecting bolt 910 while being spaced apart in the z direction. At least one of the cable 630 and the second covering portion 621 may face the heads of a plurality of bolts (not shown) connecting the cover 800 and the case 700 with a gap in the z direction.

<Effect>
As described above, the cable 630 faces the cover 800 on the outer surface 801b side while being spaced apart in the z-direction. A portion of the second covering portion 621 faces the first main portion 810 while being spaced apart in the z-direction. Therefore, movement of the cover 800 in the z direction is restricted. It is difficult for the cover 800 to be removed from the case 700 in the z direction.

When the second connector 620 is removed from the first connector 610, the cover 800 is removed from the case 700 in the z direction. When the second connector 620 is removed from the first connector 610, power is removed from the electrical components. This unpowered electrical component is exposed from the case 700 . Therefore, even if the user touches this electric component, current flow to the user is suppressed.

Further, in this configuration, since the cover 800 cannot be removed from the case 700 without the procedure described above, there is no need to separately provide an interlock mechanism or the like. As a result, the physique tends to be smaller.

A portion of the exposed portion 613 is exposed from the through hole 811 formed in the first main portion 810 as described above. The exposed portion 613 is surrounded by the first main portion 810 in a direction perpendicular to the z-direction. Therefore, the relative position of the cover 800 to the case 700 in the direction perpendicular to the z-direction is regulated. Second communication hole 792 of case 700 is less likely to be exposed from second main portion 820 . It is difficult for the electric component to be exposed from the second communication hole 792 .

As described above, the cable 630 faces the head of the connecting bolt 910 while being spaced apart in the z-direction while extending toward the third side wall 705 in the x-direction. This makes it difficult to remove the connecting bolt 910 from the cover 800 unless the second connector 620 is removed from the first connector 610 . Therefore, second communication hole 792 of case 700 is less likely to be exposed from second main portion 820 when second connector 620 is connected to first connector 610 .

Similarly, when the second covering portion 621 of the second connector 620 faces the head of the connecting bolt 910 while being spaced apart in the z direction, the connecting bolt 910 is also difficult to remove from the cover 800 .

As described above, the cover 800 is made of metal, and the second communicating hole 792 is closed by the second main portion 820 . Therefore, the second main portion 820 tends to shield the electrical components housed in the case 700 and the radiation noise radiated from one of the cables 630 facing the second main portion 820 in the z-direction to the other.

As described above, the cross-sectional area of the through hole 811 perpendicular to the z-direction is smaller than the cross-sectional area of the first communication hole 791 perpendicular to the z-direction. Therefore, radiation noise radiated from electrical components housed in case 700 is easily blocked by first main portion 810 . Noise radiated from the electrical components to the outside of the storage space is easily suppressed.

As described above, the third main portion 830 faces in the z-direction the third opening 780 into which the sealing member 900 is inserted. Therefore, the third main portion 830 tends to block the radiation noise that is radiated from the inside to the outside of the storage space through the sealing member 900 .

As described above, the first flange portion 821 faces the wall surface of the second edge wall 742 on the side spaced apart in the y direction from the second communication hole 792 , and the third flange portion 823 faces the fourth edge wall 744 . It faces the wall surface on the side spaced apart from the two communication holes 792 in the y direction. Therefore, movement of the cover 800 in the y direction is restricted. It is difficult for the cover 800 to be removed from the case 700 in the y direction. The second communication hole 792 is difficult to be exposed from the second main portion 820 . In addition, radiation noise radiated from electrical components housed in case 700 is easily blocked by first flange portion 821 to third flange portion 823 .

As described above, the third main portion 830 extends in the x direction while bending in the z direction between the first main portion 810 and the second main portion 820 . Therefore, the end portion of the cover main portion 801 on the y-direction end side is less likely to be deformed in the z-direction. A gap is less likely to occur between the second main portion 820 and the second outer peripheral portion 740 .

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present disclosure.

(First modification)
As shown in FIG. 6, a first opening 760 opening in the x direction may be formed in the first sidewall 703 . In that case, the first outer peripheral portion 730 may be annularly connected to the outer peripheral edge of the storage space in the first opening 760 . The first covering portion 611 of the first connector 610 may be connected to a first outer peripheral tip surface 730a at the tip of the first outer peripheral portion 730 extending away from the first side wall 703 in the x direction. The first connector 610 may be connected to the second cover portion 621 of the second connector 620 in such a manner that it fits.

In that case, the cable 630 connected to the second connector 620 extends away from the second connector 620 toward the cover 800 in the z-direction, and extends from the first side wall 703 toward the third side wall 705 on the outer surface 801b side of the cover 800 . Extends in the x-direction. Therefore, movement of the cover 800 in the z direction is restricted, making it difficult to remove the cover 800 from the case 700 in the z direction. Although not shown, the base 720 and the first main portion 810, the base 720 and the second main portion 820, and the base 720 and the third main portion 830 may have the same distance in the z direction.

(Other modifications)
In this embodiment, an example in which the inverter 500 is included in the power converter 300 is shown. However, power converter 300 may include a converter in addition to inverter 500 .

In this embodiment, an example in which the power conversion device 300 is included in the vehicle-mounted system 100 for an electric vehicle is shown. However, application of the power converter 300 is not particularly limited to the above example. For example, a configuration in which power conversion device 300 is included in a hybrid system that includes a motor and an internal combustion engine can also be adopted.

In this embodiment, an example in which one motor 400 is connected to the power converter 300 is shown. However, a configuration in which a plurality of motors 400 are connected to power converter 300 can also be adopted. In this case, the power conversion device 300 has a plurality of three-phase switch modules for configuring an inverter.

310... Capacitor 511... High side switch 512... Low side switch 520... Power module 610... First connector 620... Second connector 630... Cable 700... Case 742... Second edge wall 744... Second 4 Edge wall 780 Third opening 791 First communication hole 792 Second communication hole 800 Cover 810 First main portion 811 Through hole 821 First flange 823 Third flange portion, 900...sealing member, 910...connecting bolt

Claims (6)

an electrical component (310, 520) comprising a plurality of switches (511, 512);
a case (700) having a storage space in which the electrical components are stored, and a first communication hole (791) and a second communication hole (792) communicating between the storage space and the outside of the storage space;
a first connection portion (610) provided in the first communication hole, connected to the case and connected to the electric component;
a cover (800) connected to the case in a manner that closes the second communication hole;
a second connection portion (620, 630) for connecting the electric component and a power source via the first connection portion outside the storage space;
at least a portion of the second connection portion faces the cover in the direction in which the case and the cover are arranged ;
The cover has an annular portion (810) that is annular around the alignment direction,
A power conversion device in which a part of the first connecting portion is passed through the hollow (811) of the annular portion . a connecting member (910) connecting the cover to the case;
2. The power converter according to claim 1 , wherein at least a portion of said connecting member faces said second connecting portion in said row direction. 3. The power converter according to claim 1 , wherein said cover is made of metal. The cover is made of metal,
2. The power converter according to claim 1 , wherein a cross-sectional area orthogonal to the alignment direction in the hollow of the annular portion is smaller than a cross-sectional area orthogonal to the alignment direction in the first communication hole. having a non-metallic sealing member (900);
In addition to the first communication hole and the second communication hole, the case is formed with a third communication hole (780) that communicates the outside and the inside of the storage space,
the sealing member is inserted into the third communication hole in such a manner as to close the third communication hole;
The power converter according to claim 3 or 4 , wherein the sealing member faces the cover in the alignment direction. The case has a first wall portion (742) extending from the edge of the second communication hole toward the cover, and a second wall portion (744) facing the first wall portion in an orthogonal direction orthogonal to the alignment direction. have
The cover has a first extending portion (821) extending toward the case and a second extending portion (823) facing the first extending portion in the orthogonal direction,
the first extending portion faces the second communicating hole in the first wall portion on the side away from the second communicating hole in the orthogonal direction;
The power converter according to any one of claims 1 to 5 , wherein the second extending portion faces the second communication hole in the second wall portion on a side away from the second wall portion in the orthogonal direction.

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