JP6354509B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device having a case that houses electronic components.

  For example, some power conversion devices that perform power conversion between DC power and AC power include an electronic component that constitutes a power conversion circuit and a case that houses the electronic component. That is, a semiconductor module, a capacitor, and the like are housed as electronic components in the case (Patent Document 1). In the case, a high-voltage conductor portion through which a high-voltage current flows, such as a semiconductor module terminal, a capacitor terminal, or a bus bar connected to these terminals, is also arranged. The case includes a case main body having an opening and a lid that covers the opening of the case main body.

JP 2012-191767 A

  However, when the lid is deformed by an external force, it is necessary to prevent contact with the high voltage conductor. In other words, when the lid is made of a conductor, if the lid contacts the high voltage conductor, it may cause a leakage or a short circuit. There is a need to. For this reason, it is necessary to sufficiently separate the lid from the high-voltage conductor, and as a result, the case is increased in size.

  Moreover, in order to prevent said electric leakage and a short circuit, although forming an insulating film in the inner surface of a cover body is also considered, in this case, the material cost and manufacturing cost of a cover body will increase. Further, when an insulating film is formed on the inner surface of the lid or the lid is made of an insulator, it can prevent leakage or short circuit when the lid contacts the high voltage conductor. However, when the lid is deformed by an external force, the lid may come into contact with the high voltage conductor and deform the high voltage conductor. In this case, it is necessary to prevent such a situation because the high-voltage conductor portion may come into contact with surrounding conductors. Therefore, even if an insulating film is formed on the inner surface of the lid or the lid is made of an insulator, it is necessary to sufficiently separate the lid from the high-voltage conductor portion. Miniaturization is difficult.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a power conversion device that can facilitate downsizing.

One aspect of the present invention is a power conversion device having an electronic component that constitutes a power conversion circuit, and a case that houses the electronic component,
The case includes a case main body having a side wall portion formed on the outer periphery so as to form an accommodation space for accommodating the electronic component on the inner side, and an opening formed in a standing direction of the side wall portion; A lid that covers the opening of the case body,
The case main body has a partition wall that partitions the housing space and stands up toward the opening,
The partition wall portion is formed in a position closer to the lid body than the high voltage conductor portion through which a high voltage current flows, arranged in the case .
The partition wall part is in the power conversion device characterized by being separated from the lid .
Another aspect of the present invention is a power conversion device having an electronic component constituting a power conversion circuit and a case for housing the electronic component,
The case includes a case main body having a side wall portion formed on the outer periphery so as to form an accommodation space for accommodating the electronic component on the inner side, and an opening formed in a standing direction of the side wall portion; A lid that covers the opening of the case body,
The case main body has a partition wall that partitions the housing space and stands up toward the opening,
The partition wall portion is formed in a position closer to the lid body than the high voltage conductor portion through which a high voltage current flows, arranged in the case.
The electronic component has a capacitor, and the terminal of the capacitor is the high-voltage conductor.
The capacitor is housed in a capacitor housing part formed in the case body, and at least a part of the partition wall constitutes at least a part of the capacitor housing part,
The capacitor is sealed with a sealing resin in the capacitor housing portion, and the edge on the lid side of the partition wall portion is closer to the lid body than the potting surface of the sealing resin. To power converter.

  In the power conversion device, the case main body has a partition wall portion erected toward the opening. Thereby, even if an external force acts on the lid that closes the opening and the lid is deformed inward, the lid can be supported by the partition wall. As a result, it is possible to prevent the lid body from being deformed in the direction opposite to the opening portion from the edge of the partition wall portion on the lid body side. In the following, for the sake of convenience, the opening side is referred to as the upper side and the opposite side is referred to as the lower side with reference to the housing space of the case body.

  And the partition part is formed to the position close | similar to a cover body rather than the said high voltage conductor part. That is, the upper end of the partition wall is disposed above the high voltage conductor. Therefore, even if the lid body is deformed, the lid body can be prevented from coming into contact with the high voltage conductor portion by restricting the deformation by the partition wall as described above.

  As described above, according to the present invention, it is possible to provide a power conversion device that can be easily downsized.

The top view of the power converter device in the state which removed the cover body in Example 1. FIG. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. The top view of the power converter device in the state which removed the cover body in Example 2. FIG. The top view of the power converter device in the state which removed the cover body in Example 3. FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4.

  The power conversion device can be, for example, an in-vehicle inverter or converter mounted on a vehicle such as an automobile.

  Moreover, it is preferable that the said cover body consists of a conductor. In this case, it is possible to suppress the noise generated from the circuit in the case from affecting the outside, and conversely to prevent the external noise from affecting the circuit in the case. Further, when the lid is made of a conductor, if the lid is deformed and the lid contacts the high voltage conductor, there is a risk of causing leakage or short circuit even if the high voltage conductor is not particularly deformed. Therefore, if the partition wall is not formed as described above, it is necessary to sufficiently separate the lid from the high voltage conductor as described above. However, since the partition wall portion is provided as described above, the deformation of the lid body can be restricted, so that the device can be particularly easily reduced in size.

Example 1
An embodiment of the power conversion device will be described with reference to FIGS.
The power conversion device 1 of this example includes an electronic component that constitutes a power conversion circuit, and a case 4 that houses the electronic component. Examples of the electronic component include a semiconductor module 2, a capacitor 3, a reactor (not shown), and the like.

The case 4 has a side wall portion 41 formed on the outer periphery so as to form an accommodation space 45 for accommodating electronic components on the inside, and a case body 40 having an opening 42 formed in the standing direction of the side wall portion 41. And a lid 400 that covers the opening 42 of the case main body 40.
The case body 40 has a partition wall 43 that partitions the accommodation space 45 and stands up toward the opening 42.

The partition wall portion 43 is formed to a position closer to the lid body 400 than the high voltage conductor portion 5 that is disposed in the case 4 and through which a high voltage current flows.
That is, the partition wall portion 43 is formed to be higher than the high voltage conductor portion 5, and the interval in the vertical direction Z between the upper end of the partition wall portion 43 and the lid portion 400 is the upper end of the high voltage conductor portion 5 and the lid. It is narrower than the interval in the up-down direction Z with the part 400.

  As described above, in the present specification, for convenience, the lid 400 side is described as the upper side and the opposite side as the lower side based on the accommodation space 45 of the case main body 40, but this is only for convenience. For example, the vertical direction when the power conversion device 1 is mounted on a vehicle is not limited.

The power conversion device 1 of this example can be an inverter that is mounted on a vehicle and performs power conversion between a DC power source and a three-phase AC rotating electric machine.
In this example, the lid 400 is made of a conductor. Specifically, for example, the lid 400 is made of a steel plate. The case body 40 is made of an aluminum alloy.

  As shown in FIG. 2, the case main body 40 has a substantially rectangular base plate 44, and the side wall portion 41 stands from the outer peripheral edge of the base plate 44 in the normal direction of the base plate 44. The accommodation space 45 surrounded by the base plate 44 and the side wall portion 41 has an opening 42 on the surface facing the base plate 44. That is, the case body 40 has an opening 42 that opens the accommodation space 45 upward.

  The capacitor 3 is accommodated in a capacitor accommodating portion 451 formed in the case main body 40, and at least a part of the partition wall portion 43 constitutes at least a part of the capacitor accommodating portion 451. That is, the accommodation space 45 in the case main body 40 is partitioned by the partition wall portion 43 into the capacitor accommodation portion 451 and the other spaces. As shown in FIG. 1, the capacitor housing portion 451 is surrounded by the partition wall portion 43 and a part of the side wall portion 41.

  Further, in the housing space 45 of the case main body 40, a plurality of semiconductor modules 2 are arranged together with the cooler 11 for cooling them in a space other than the capacitor housing portion 451. The cooler 11 includes a plurality of cooling pipes 111 stacked alternately with the semiconductor module 2, and the plurality of cooling pipes 111 are connected at both ends in the longitudinal direction. The stacked body 12 of the semiconductor module 2 and the cooling pipe 111 is arranged so as to be aligned with the capacitor 3 in the stacking direction X. The stacked body 12 is sandwiched between the partition wall 43 and the side wall 41 in a state where the stacked body 12 is pressed in the stacking direction X by the pressing member 121 arranged at one end in the stacking direction X. The cooler 11 is provided with a refrigerant introduction pipe 112 and a refrigerant discharge pipe 113 at one end in the stacking direction X. The refrigerant introduction pipe 112 and the refrigerant discharge pipe 113 protrude from the case body 40.

  The semiconductor module 2 includes a switching element therein, and the main electrode terminal 21 and the control terminal 22 protrude in the vertical direction Z in opposite directions. The main electrode terminal 21 protrudes upward, and the control terminal 22 protrudes downward. The control terminal 22 is connected to the control circuit board 13. The control circuit board 13 is arranged in a board arrangement space 46 formed on the lower side of the base plate 44. That is, the case body 40 has a substrate placement space 46 at a position opposite to the accommodation space 45 with the base plate 44 interposed therebetween, in addition to the accommodation space 45 that accommodates the semiconductor module 2 and the capacitor 3. The substrate arrangement space 46 is also covered with a lower lid 49 made of, for example, a steel plate.

  The main electrode terminal 21 of the semiconductor module 2 is connected to the terminal 31 of the capacitor 3 (hereinafter referred to as “capacitor terminal 31” as appropriate) by the bus bar 14. The main electrode terminal 21, the bus bar 14, and the capacitor terminal 31 flow through a controlled current that is converted by the power conversion circuit. That is, the main electrode terminal 21, the bus bar 14, and the capacitor terminal 31 are the high-voltage conductor portion 5 through which a high-voltage current flows. And the upper end edge 431 of the partition part 43 is located above the upper end of any high voltage conductor part 5 (position close to the cover body 400).

  The capacitor 3 is sealed with the sealing resin 32 in the capacitor housing portion 451. As shown in FIG. 2, the edge (upper edge 431) on the side of the lid 400 in the partition wall 43 is closer to the lid 400 than the potting surface 321 of the sealing resin 32. That is, the upper end edge 431 of the partition wall 43 is located above the potting surface 321.

  The capacitor 3 is formed by sealing the capacitor element 30 with a sealing resin 32. As shown in FIG. 1, the capacitor 3 has four capacitor terminals 31 protruding from the potting surface 321 of the sealing resin 32. The pair of capacitor terminals 31 is connected to the main electrode terminal 21 of the semiconductor module 2 directly or via the bus bar 14. The other pair of capacitor terminals 31 extends in a direction orthogonal to the stacking direction X and is connected to a terminal block (not shown).

As shown in FIG. 2, the upper end edge 431 of the partition wall portion 43 that constitutes a part of the capacitor housing portion 451 is located below the upper end edge of the side wall portion 41. The partition wall 43 is separated from the lid 400.
The partition wall 43 has a notch 432 that is retracted from the side of the lid 400 rather than the periphery at the end near the lid 400. A part of the high voltage conductor portion 5 is disposed in the notch portion 432. That is, the capacitor terminal 31 that is the high-voltage conductor portion 5 is disposed in the notch portion 432 formed at the upper end portion of the partition wall portion 43. Thus, the capacitor terminal 31 is disposed across the partition wall 43 and inside and outside the capacitor housing 451. The lower end of the notch 432 is located above the potting surface 321.

Next, the function and effect of this example will be described.
In the power conversion device 1, the case main body 40 includes a partition wall 43 that is erected toward the opening 42. Thereby, even if an external force acts on the lid 400 that closes the opening 42 and the lid 400 is deformed inward, the lid 400 can be supported by the partition wall 43. As a result, the lid 400 can be prevented from being deformed to a position below the upper end edge 431 of the partition wall 43.
The upper end edge 431 of the partition wall 43 is disposed above the high voltage conductor 5. Therefore, even if the lid 400 is deformed, it is possible to prevent the lid 400 from coming into contact with the high-voltage conductor 5 by restricting the deformation by the partition wall 43 as described above.

  In particular, in this example, since the lid 400 is made of a conductor, if the lid 400 contacts the high voltage conductor 5, there is a risk of causing leakage or short circuit even if the high voltage conductor 5 is not particularly deformed. . Therefore, if the partition wall 43 is not formed as described above, the lid 400 needs to be sufficiently separated from the high-voltage conductor 5. However, since the partition wall portion 43 is provided as described above, the deformation of the lid 400 can be restricted, so that the device can be particularly easily reduced in size.

Further, since the partition wall portion 43 is separated from the lid body 400, it is possible to suppress interference with the partition wall portion 43 when the lid portion 400 vibrates.
The partition wall 43 has a notch 432, and a part of the high voltage conductor 5 is arranged in the notch 432. Thereby, it becomes easy to arrange the high voltage conductor portion 5 in the accommodation space 45 so as to straddle the partition wall portion 43. Further, when the lid 400 is deformed, it is possible to more reliably prevent the lid 400 from interfering with the high voltage conductor 5.

  Further, since the partition wall 43 is formed above the capacitor terminal 31, it is possible to prevent the lid 400 from interfering with the capacitor terminal 31. The partition wall portion 43 constitutes a part of the capacitor housing portion 451. Therefore, it is easy to obtain a configuration that prevents the lid 400 from interfering with the capacitor terminal 31.

  Further, the upper end edge 431 of the partition wall 43 is closer to the lid 400 than the potting surface 321 of the sealing resin 32 of the capacitor 3. Thereby, a sufficient contact area between the sealing resin 32 and the partition wall 43 can be secured, and peeling between the sealing resin 32 and the partition wall 43 can be effectively prevented.

  As described above, according to this example, it is possible to provide a power conversion device that can be easily downsized.

(Example 2)
In this example, as shown in FIG. 3, the capacitor 3 has two capacitor terminals 31 protruding from the potting surface 321 of the sealing resin 32.
In this example, the branch terminal 311 is branched from each of the two capacitor terminals 31 exposed from the potting surface 321. The pair of branch terminals 311 extends in a direction orthogonal to the stacking direction X and is connected to a terminal block (not shown). The branch terminal 311 is also the high voltage conductor portion 5 through which a high voltage current flows, and is located below the upper end edge 431 of the partition wall portion 43.

In the present example, a plate-like spacer member 122 is interposed between the partition wall 43 and the pressure member 121.
Others have the same configuration as that of the first embodiment and have the same effects. Of the reference numerals used in this example or the drawings relating to this example, the same reference numerals as those used in the first embodiment denote the same components as in the first embodiment unless otherwise specified.

(Example 3)
In this example, as shown in FIGS. 4 and 5, a bus bar 140 is provided between the capacitor terminal 31 of the capacitor 3 and the main electrode terminal 21 of the semiconductor module 2.
The bus bar 140 has one end connected to the capacitor terminal 31 and the other end connected to the main electrode terminal 21. These connecting portions 141 are welded, for example. The bus bar 140 is also a high voltage conductor portion 5 through which a high voltage current flows, and is located below the upper end edge 431 of the partition wall portion 43.

In the present example, a plate-like spacer member 122 is interposed between the partition wall 43 and the pressure member 121.
Others have the same configuration as that of the first embodiment, and have the same effects. Of the reference numerals used in this example or the drawings relating to this example, the same reference numerals as those used in the first embodiment denote the same components as in the first embodiment unless otherwise specified.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Semiconductor module (electronic component)
3 Capacitors (electronic parts)
4 Case 40 Case body 400 Cover body 41 Side wall part 42 Opening part 43 Partition part 45 Housing space 5 High voltage conductor part

Claims (8)

A power conversion device (1) having an electronic component (3) constituting a power conversion circuit and a case (4) for accommodating the electronic component (3),
The case (4) has a side wall (41) formed on the outer periphery so as to form an accommodation space (45) for accommodating the electronic component (3) on the inner side, and the side wall (41) is erected. A case body (40) having an opening (42) formed in a direction, and a lid (400) covering the opening (42) of the case body (40),
The case body (40) has a partition wall (43) that partitions the housing space (45) and stands up toward the opening (42).
The partition wall (43) is formed in a position closer to the lid (400) than the high voltage conductor (5) through which the high voltage current flows, which is arranged in the case (4) .
The said partition part (43) is spaced apart from the said cover (400), The power converter device (1) characterized by the above-mentioned . It has a condenser (3) as the electronic component, the power conversion apparatus according to claim 1 terminal of the capacitor (3), which is a the high voltage conductor (5) (1). The capacitor (3) is housed in a capacitor housing part (451) formed in the case body (40), and at least a part of the partition wall part (43) is at least a part of the capacitor housing part (451). The power conversion device (1) according to claim 2, wherein the power conversion device (1) is configured. The capacitor (3) is sealed with a sealing resin (32) in the capacitor housing part (451), and the partition wall part (43) rather than the potting surface (321) of the sealing resin (32). The power conversion device (1) according to claim 3, wherein an edge (431) on the lid (400) side of the lid is close to the lid (400). A power conversion device (1) having an electronic component (3) constituting a power conversion circuit and a case (4) for accommodating the electronic component (3),
The case (4) has a side wall (41) formed on the outer periphery so as to form an accommodation space (45) for accommodating the electronic component (3) on the inner side, and the side wall (41) is erected. A case body (40) having an opening (42) formed in a direction, and a lid (400) covering the opening (42) of the case body (40),
The case body (40) has a partition wall (43) that partitions the housing space (45) and stands up toward the opening (42).
The partition wall (43) is formed in a position closer to the lid (400) than the high voltage conductor (5) through which the high voltage current flows, which is arranged in the case (4) .
The electronic component has a capacitor (3), and the terminal of the capacitor (3) is the high-voltage conductor (5),
The capacitor (3) is housed in a capacitor housing part (451) formed in the case body (40), and at least a part of the partition wall part (43) is at least a part of the capacitor housing part (451). Comprising
The capacitor (3) is sealed with a sealing resin (32) in the capacitor housing part (451), and the partition wall part (43) rather than the potting surface (321) of the sealing resin (32). The power converter (1) characterized in that an end edge (431) on the lid (400) side in is close to the lid (400 ). The power converter (1) according to claim 5, wherein the partition wall (43) is separated from the lid (400). The said converter (400) consists of a conductor, The power converter device (1) as described in any one of Claims 1-6 characterized by the above-mentioned. The partition wall portion (43) has a notch portion (432) that is recessed from the lid body (400) side relative to the periphery at an end portion closer to the lid body (400), and the notch portion (432). The power converter (1) according to any one of claims 1 to 7 , characterized in that a part of the high-voltage conductor (5) is disposed in the power converter (1).

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