Power conversion device

Abstract

To provide a power conversion device which facilitates connection of a wire.SOLUTION: A power conversion device 100 comprises: a power conversion section 10 including a power conversion housing 11 in which a power conversion element is stored; a filter section 20 including a filter housing 21 in which a filter element is stored; a main circuit conductor 31 as a first connection conductor which is disposed outside of a first face 11a of the power conversion housing 11 and a first face 21a of the filter housing 21 and electrically connects the power conversion section 10 and the filter section 20; and a ground conductor 32 as a second connection conductor which is disposed on a bottom face 11b of the power conversion housing 11 which is different from the first face 11a of the power conversion housing 11 and a top face 21b of the filter housing 21 which is different from the first face 21a of the filter housing 21, and electrically connects the power conversion section 10 and the filter section 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power conversion device, and more particularly to a power conversion device including a power conversion section and a filter section. [Background technology]

[0002] BACKGROUND ART Conventionally, a power conversion device including a power conversion unit and a filter unit has been known (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses an electric device (power conversion device) that includes an inverter (power conversion unit) and a noise filter (filter unit) inside a housing and outputs three-phase AC power supplied from a power source to a motor, which is a load. The power conversion device of the above-mentioned Patent Document 1 electrically connects the power conversion unit and the filter unit with electric wires via a terminal block provided in the power conversion unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-35295 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned Patent Document 1, the power conversion unit and the filter unit are electrically connected by electric wires via a terminal block provided in the power conversion unit. However, when connecting different types of wiring, such as three-phase AC wiring and a ground wire, to one surface of the power conversion unit, the wiring becomes complicated, making the work difficult and causing workers to connect the wiring to the wrong places. Therefore, a power conversion device that makes it easy to connect the wiring is desired.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a power conversion device that allows easy wiring connections. [Means for solving the problem]

[0007] In order to achieve the above object, a power conversion device according to a first aspect of the present invention comprises: a power conversion unit including a power conversion housing that houses a power conversion element; a filter unit including a filter housing that houses a filter element; a first connecting conductor that is arranged on a first surface of the power conversion housing and outside the first surface of the filter housing and electrically connects the power conversion unit and the filter unit; and a second connecting conductor that is arranged on a second surface of the power conversion housing different from the first surface of the power conversion housing and on a second surface of the filter housing different from the first surface of the filter housing and electrically connects the power conversion unit and the filter unit.

[0008] As described above, a power conversion device according to a first aspect of the present invention includes a first connecting conductor disposed outside the first surface of the power conversion housing and the first surface of the filter housing, electrically connecting the power conversion unit and the filter unit, and a second connecting conductor disposed on a second surface of the power conversion housing different from the first surface of the power conversion housing and a second surface of the filter housing different from the first surface of the filter housing, electrically connecting the power conversion unit and the filter unit. Because the first connecting conductor and the second connecting conductor are disposed on different surfaces of the power conversion housing and the filter housing, respectively, it is less likely that the first connecting conductor and the second connecting conductor will be connected to the wrong places, unlike when all of the connecting conductors are connected to one surface. This makes it easier to connect the wiring of the power conversion device.

[0009] In the power converter according to the first aspect, preferably, the first connecting conductors arranged on the outside of the first surface of the power conversion housing and the first surface of the filter housing are main circuit conductors through which AC power is transmitted between the power conversion unit and the filter unit, and the second connecting conductors arranged on the second surface of the power conversion housing different from the first surface of the power conversion housing and the second surface of the filter housing different from the first surface of the filter housing are earth conductors connected to earth. With this configuration, multiple connecting conductors with different uses, i.e., the main circuit conductors for transmitting AC current and the earth conductors connected to earth, are connected to different surfaces, thereby preventing mistakes in the connection positions of the main circuit conductors and the earth conductors.

[0010] In this case, the power conversion housing preferably includes an opening on the side facing the filter housing, and the ground conductor is stacked on the filter housing and configured to close the opening of the power conversion housing. With this configuration, the ground conductor has the function of being connected to the filter housing to provide a ground potential, as well as the function of serving as a cover material that closes the opening of the power conversion housing, thereby simplifying the configuration of the power conversion device compared to when two separate parts are provided.

[0011] In the power converter in which the power conversion housing includes an opening, the earth conductor is preferably a flat conductor extending in a direction perpendicular to the stacking direction of the power conversion housing and the filter housing and having a contact surface that makes surface contact with the top surface of the filter housing. With this configuration, the contact surface of the earth conductor makes electrical contact with the filter housing, thereby achieving a more reliable connection to the earth than connection methods with a small contact area, such as point contact.

[0012] In this case, preferably, the power conversion unit includes a fan that generates cooling air inside the power conversion housing, and the ground conductor includes a protrusion that protrudes from the position where the contact surface is located toward the inside of the power conversion housing. With this configuration, the protrusion of the ground conductor reduces the volume inside the power conversion housing. This narrows the airflow path through which the cooling air flows inside the housing, thereby increasing the airflow speed of the cooling air. As a result, the cooling capacity can be improved compared to when the same fan is used to cool a device with a wider airflow path through which the cooling air flows.

[0013] In the power converter in which the first connecting conductor is a main circuit conductor and the second connecting conductor is a ground conductor, the ground conductor is preferably fixed to the filter housing by a fastening member that is the same as the fastening member that fastens the power conversion housing and the filter housing. With this configuration, the ground conductor can be fixed to the filter housing using only the common fastening member that fastens the power conversion housing and the filter housing, which reduces the number of parts and makes assembly easier.

[0014] In the power converter in which the first connecting conductor is a main circuit conductor and the second connecting conductor is a ground conductor, the main circuit conductor is preferably formed of a solid wire having a circular cross section. This configuration allows the power converter unit and the filter unit to be connected using a solid wire that has fewer restrictions on the bending radius compared to a stranded wire having the same cross section. As a result, the main circuit conductor, which is a wiring, can be routed in a more space-saving manner, thereby reducing the envelope volume of the power converter.

[0015] In this case, preferably, the power conversion unit and the filter unit are arranged in a stacked manner, and the main circuit conductor includes a linear first portion extending in the stacking direction in which the power conversion unit and the filter unit are stacked, a second portion extending toward the power conversion unit, and a third portion extending toward the filter unit, and the horizontal position of each of the first portion, second portion, and third portion, which is perpendicular to the stacking direction, is located inside the horizontally extending end of the filter housing. With this configuration, all portions of the main circuit conductor, which is wiring, are located inside the filter housing, thereby preventing the envelope volume of the power conversion device from becoming larger due to the main circuit conductor.

[0016] In the power converter, the main circuit conductor is formed of a single wire having a circular cross section, and preferably has a crimp terminal attached to one end of the main circuit conductor. This configuration makes it easy to fasten the main circuit conductor with a fastening member and makes it difficult for the fastened state to be released. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a power conversion device in which wiring can be easily connected. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view showing a power conversion device according to an embodiment; [Figure 2] FIG. 2 is a circuit diagram showing electrical connections of a power conversion device according to an embodiment. [Figure 3] FIG. 1 is a perspective view illustrating a configuration of a power conversion housing according to an embodiment. [Figure 4] FIG. 2 is a perspective view illustrating a configuration of a filter housing according to an embodiment. [Figure 5] FIG. 2 is a perspective view illustrating the configuration of main circuit wiring according to one embodiment. [Figure 6] FIG. 2 is a perspective view illustrating a configuration of a ground conductor according to an embodiment. [Figure 7]FIG. 2 is a perspective view illustrating a configuration of a wiring cover according to an embodiment. [Figure 8] 8 is a cross-sectional view of the power converter shown in FIG. 1 taken along the line VIII-VIII. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings.

[0020] The configuration of a power conversion device 100 according to this embodiment will be described with reference to FIGS.

[0021] (Configuration of power conversion device) As shown in FIG. 1 , the power conversion device 100 includes a power conversion unit 10, a filter unit 20, a connecting conductor 30, and a wiring cover 40. Here, the direction in which the power conversion unit 10 and the filter unit 20 are stacked is defined as the Z direction, with the power conversion unit 10 side of the Z direction defined as the Z1 direction and the filter unit 20 side of the Z direction defined as the Z2 direction. One of the horizontal directions perpendicular to the Z direction is defined as the X direction, and the other direction perpendicular to the X direction is defined as the Y direction. One of the X directions is defined as the X1 direction, and the other of the X directions is defined as the X2 direction. One of the Y directions is defined as the Y1 direction, and the other of the Y directions is defined as the Y2 direction.

[0022] As shown in FIG. 2, the power conversion device 100 is installed, for example, in a control panel and used as a motor drive for operating a motor M as a load. The power conversion device 100 includes a power conversion unit 10 and a filter unit 20. The power conversion unit 10 includes an inverter circuit I internally including a rectifier circuit 10a, a bridge circuit 10b, and a smoothing capacitor 10c. The inverter circuit I of the power conversion unit 10 is configured to convert AC power supplied from a power source S via the filter unit 20 into DC power using the rectifier circuit 10a, smooth the DC power using the smoothing capacitor 10c, convert the DC power into AC power using the bridge circuit 10b, and output the AC power to the motor M as a load.

[0023] As shown in FIG. 1, the power conversion unit 10 includes a power conversion housing 11, terminal blocks 12 and 13, an operation panel 14, and a fan 15 (see FIG. 8). The power conversion housing 11 is formed of an insulating resin material such as PPS (Poly Phenylene Sulfide). The terminal block 12 is connected to a main circuit wiring 31 (described later) to supply power output from the filter unit 20 to the power conversion unit 10. The terminal block 13 is connected to wiring (not shown) to supply power output from the power conversion unit 10 to a motor M, which is a load. The operation panel 14 includes an operation unit 14a that allows an operator to adjust the power output from the power conversion unit 10. The fan 15 forcibly cools heat-generating circuit components, such as semiconductor elements such as IGBTs that constitute the bridge circuit 10b, housed inside the power conversion housing 11.

[0024] As shown in FIG. 3, the power conversion housing 11 of the power conversion unit 10 has a ventilation hole 11d on a first surface 11a, which is one of the side surfaces, and the cooling air generated by the fan 15 (see FIG. 8) is discharged to the outside through the ventilation hole 11d of the power conversion housing 11. The power conversion housing 11 also has an opening 11c on a bottom surface 11b in the Z2 direction, to which a ground conductor 32 (see FIG. 6), which will be described later, is attached, thereby accommodating circuit components included in the inverter circuit I (see FIG. 2). The power conversion housing 11 also has a fixing portion 11e including a notch or a through-hole for passing a bolt B for fixing the power conversion unit 10 to the filter unit 20. The bottom surface 11b is an example of a "second surface of the power conversion housing" in the claims.

[0025] 2, the filter unit 20 includes a filter circuit F configured with, for example, a plurality of reactors L and capacitors C. The filter unit 20 is a so-called EMC (Electro Magnetic Compatibility) filter. The filter unit 20 is configured to output AC power supplied from a power source S to an inverter circuit I of the power conversion unit 10.

[0026] As shown in FIG. 4, the filter unit 20 includes a filter housing 21, a terminal block 22, and a terminal block 23. The filter housing 21 is formed of a metal with relatively low electrical resistance, such as aluminum, and is configured to house circuit components therein. The filter housing 21 is also connected to a ground G (see FIG. 2). The terminal block 22 is a terminal block to which wiring (not shown) is connected in order to input power supplied from a power source S (see FIG. 2) to the filter unit 20. The terminal block 23 is a terminal block to which main circuit wiring 31 (see FIG. 5), which will be described later, is connected in order to supply power output from the filter unit 20 to the power conversion unit 10.

[0027] The filter housing 21 includes a first surface 21a and a top surface 21b. Three terminal blocks 23 are provided on the first surface 21a. The top surface 21b includes a plurality of screw holes 21d, to which bolts B (see FIG. 1) are used to fasten the power conversion housing 11 and the cover 40 (see FIG. 1) together with a ground conductor 32 (see FIG. 6), which will be described later. In other words, the power conversion unit 10 and the filter unit 20 are grounded in an electrically connected state. The top surface 21b is an example of a "second surface of the filter housing" in the claims.

[0028] As shown in FIG. 1 , the connecting conductor 30 includes a main circuit wiring 31 and a ground conductor 32 (see FIG. 6 ). The main circuit wiring 31 has, for example, a circular cross section and is made of a single wire made of a metal with low electrical resistance, such as copper. The main circuit wiring 31 is provided between a terminal block 12 provided on the first surface 11 a of the power conversion housing 11 and a terminal block 23 provided on the first surface 21 a of the filter housing 21, and supplies power output from the filter unit 20 to the power conversion unit 10. Three main circuit wirings 31 are provided, one for each phase, to supply three-phase AC power, each with a different phase. The main circuit wiring 31 is an example of a “first connecting conductor” and a “main circuit conductor” in the claims. The ground conductor 32 is an example of a “second connecting conductor” in the claims.

[0029] As shown in FIG. 5, the main circuit wiring 31 includes a first portion 31a, a second portion 31b, and a third portion 31c. The first portion 31a is a linear conductor whose length is adjusted according to the distance between the terminal block 12 (see FIG. 1) of the power conversion unit 10 and the terminal block 23 (see FIG. 4) of the filter unit 20. The first portion 31a is a copper solid wire covered with an insulating coating material 31d, such as polyethylene. A crimp terminal 31e is crimped and fixed to the exposed copper solid wire portion of the second portion 31b. That is, the main circuit wiring 31 is connected to the terminal block 12 of the power conversion unit 10 and then to the inverter circuit I through a fastening member, such as a screw (not shown), passing through the crimp terminal 31e. The third portion 31c is an exposed copper solid wire portion that is inserted into the terminal block 23 of the filter unit 20. The third portion 31c inserted into the terminal block 23 is pressed by a pressing member (not shown) provided on the terminal block 23, and is connected to the filter circuit F included in the filter unit 20.

[0030] As shown in FIG. 6, the ground conductor 32 is made of a metal having a relatively low electrical resistance, such as aluminum, and is connected to the ground G of the inverter circuit I (see FIG. 2) of the power conversion unit 10. Also, as shown in FIG. 6, the ground conductor 32 includes a contact surface 32a and a protruding portion 32b. The contact surface 32a of the ground conductor 32 is divided into two portions, one in the Y1 direction and the other in the Y2 direction, and the surface in the Z2 direction contacts the filter housing 21 (see FIG. 4). The contact surface 32a is provided with a fixing portion 32c including a notch or a through-hole for passing a bolt B therethrough, and the contact surface 32a is fixed to the filter housing 21 together with the power conversion housing 11 and the cover 40. Also, the contact surface 32a on the Y1 direction side includes a notch 32d for accommodating the fan 15. The ground conductor 32 also includes a connection portion extending in the Z1 direction from a portion of the protruding portion 32b and connected to the ground wire of the inverter circuit I.

[0031] As shown in Fig. 1, the wiring cover 40 is formed of, for example, PPS resin, and is provided to prevent the main circuit wiring 31 from being exposed to the outside. The wiring cover 40 is provided to cover the first surface 11a of the power conversion housing 11 and the first surface 21a of the filter housing 21. As shown in Fig. 7, the wiring cover 40 includes a fixing portion 41 including a through-hole for passing a bolt B, and is fixed to the filter housing 21 of the filter section 20 together with the power conversion housing 11 and the ground conductor 32. The wiring cover 40 also includes a ventilation hole 42, which is configured to exhaust air released from the ventilation hole 11d (see Fig. 3) of the power conversion housing 11 to the outside.

[0032] (Internal configuration of power conversion device) Next, a detailed internal configuration of the power conversion device 100 will be described with reference to Fig. 8. The power conversion device 100 is configured to include an inverter circuit I in an area A defined by the power conversion housing 11 and the earth conductor 32, and a filter circuit F inside the filter housing 21. In addition, in the area A defined by the power conversion housing 11 and the earth conductor 32, a heat sink H made of a metal having high thermal conductivity such as aluminum is attached to a printed circuit board P on which the inverter circuit I is mounted, and the circuit elements included in the inverter circuit I are cooled by cooling air generated by a fan 15.

[0033] The filter circuit F and the inverter circuit I are electrically connected by a main circuit wiring 31 and are also grounded by a ground conductor 32. Note that the first portion 31a, the second portion 31b, and the third portion 31c of the main circuit wiring 31 (see FIG. 5) are all disposed on the Y1 direction side (inside) of the end 21c of the filter housing 21 on the Y2 direction side.

[0034] The contact surface 32a of the ground conductor 32 is disposed so as to be sandwiched between the bottom surface 11b of the power conversion housing 11 and the top surface 21b of the filter housing 21. At this time, the contact surface 32a of the ground conductor 32 passes through the fixing portion 32c of the ground conductor 32, the fixing portion 41 of the wiring cover 40, and the fixing portion 11e of the power conversion housing 11, and is brought into surface contact with the metal top surface 21b of the filter housing 21 by the fastening force of the bolt B fastened to the screw hole 21d (see FIG. 4) of the filter housing 21. As a result, the ground conductor 32 electrically connects the ground wire of the inverter circuit I of the power conversion unit 10 and the ground wire of the filter circuit F of the filter unit 20, and connects them to an external earth G (see FIG. 2).

[0035] In this embodiment, the metal-sheet earth conductor 32 is bent to protrude in the Z1 direction toward the inside of the power conversion housing 11, forming a protruding portion 32b. Therefore, the volume of the area A surrounded by the power conversion housing 11 and the earth conductor 32 is smaller than when the ground conductor 32 does not include the protruding portion 32b. In other words, the air path through which the cooling air flows inside the power conversion housing 11 is smaller.

[0036] (Effects of this embodiment) Next, the effects of this embodiment will be described.

[0037] As described above, in the above embodiment, the power conversion device 100 comprises: a power conversion unit 10 including a power conversion housing 11 that houses a power conversion element; a filter unit 20 including a filter housing 21 that houses a filter element; a main circuit wiring 31 that is arranged on the first surface 11a of the power conversion housing 11 and outside the first surface 21a of the filter housing 21 and serves as a first connecting conductor that electrically connects the power conversion unit 10 and the filter unit 20; and an earth conductor 32 that is arranged on the bottom surface 11b of the power conversion housing 11 that is different from the first surface 11a of the power conversion housing 11 and on the top surface 21b of the filter housing 21 that is different from the first surface 21a of the filter housing 21 and serves as a second connecting conductor that electrically connects the power conversion unit 10 and the filter unit 20. As a result, the main circuit wiring 31 and the ground conductor 32 are arranged on different surfaces of the power conversion housing 11 and the filter housing 21, and therefore, unlike when all connection points of the main circuit wiring 31 and the ground conductor 32 are concentrated on one surface, it is less likely that the main circuit wiring 31 and the ground conductor 32 are connected to the wrong points. As a result, the wiring of the power conversion device 100 can be connected easily.

[0038] Furthermore, in the above embodiment, the first connecting conductor arranged outside the first surface 11a of the power conversion casing 11 and the first surface 21a of the filter casing 21 is the main circuit wiring 31 through which AC power is transmitted between the power conversion unit 10 and the filter unit 20, and the second connecting conductor arranged on the bottom surface 11b of the power conversion casing 11, which is different from the first surface 11a of the power conversion casing 11, and on the top surface 21b of the filter casing 21, which is different from the first surface 21a of the filter casing 21, is the earth conductor 32 connected to the earth G. As a result, multiple connecting conductors with different uses, namely the main circuit wiring 31 for transmitting AC current and the earth conductor 32 for connecting to the earth G, are connected to different surfaces, thereby preventing mistakes in the connection positions of the main circuit wiring 31 and the earth conductor 32.

[0039] Furthermore, in the above embodiment, the power conversion housing 11 includes an opening 11c provided on the side facing the filter housing 21, and the ground conductor 32 is disposed by being stacked on the filter housing 21 and configured to cover the opening 11c of the power conversion housing 11. As a result, the ground conductor 32 has the function of being connected to the filter housing 21 to provide a ground potential, as well as the function of serving as a lid that covers the opening 11c of the power conversion housing 11, which simplifies the configuration of the power conversion device 100 compared to when two separate components are prepared.

[0040] Furthermore, in the above embodiment, the earth conductor 32 is a flat conductor that extends in the X and Y directions perpendicular to the Z direction, which is the stacking direction of the power conversion housing 11 and the filter housing 21, and has a contact surface 32a that comes into surface contact with the top surface 21b of the filter housing 21. As a result, the contact surface 32a of the earth conductor 32 comes into surface contact with the filter housing 21, thereby establishing electrical conduction, and therefore a more reliable connection to the earth G can be achieved compared to connection using a connection method with a small contact area, such as point contact.

[0041] Furthermore, in the above embodiment, the power conversion unit 10 includes a fan 15 that generates cooling air inside the power conversion housing 11, and the ground conductor 32 includes a protrusion 32b that protrudes from the position of the contact surface 32a toward the inside of the power conversion housing 11. This narrows the area A, which is the air path through which the cooling air flows inside the power conversion housing 11, and increases the wind speed of the cooling air. As a result, even when the same fan 15 is used, the cooling capacity can be improved compared to when the air path through which the cooling air flows inside the power conversion housing 11 is wide.

[0042] Furthermore, in the above embodiment, the earth conductor 32 is fixed to the filter housing 21 by the same bolt B as the bolt B, which is a fastening member that fastens the power conversion housing 11 and the filter housing 21. This allows the earth conductor 32 to be fixed to the filter housing 21 using only the bolt B, which is a fastening member that fastens the power conversion housing 11 and the filter housing 21, thereby simplifying the configuration of the power conversion device 100 and facilitating assembly.

[0043] In the above embodiment, the main circuit wiring 31 is formed of a single wire having a circular cross section. This allows the power conversion unit 10 and the filter unit 20 to be connected using a single wire that has fewer restrictions on the bending radius compared to a stranded wire having the same cross section. As a result, the main circuit wiring 31 can be routed in a space-saving manner, and the envelope volume of the power conversion device 100 can be reduced.

[0044] Furthermore, in the above embodiment, the power conversion unit 10 and the filter unit 20 are arranged to be stacked in the Z direction, and the main circuit wiring 31 includes a linear first portion 31a extending in the Z direction, which is the stacking direction of the power conversion unit 10 and the filter unit 20, a second portion 31b extending toward the power conversion unit 10, and a third portion 31c extending toward the filter unit 20, and the positions in the Y direction perpendicular to the Z direction of each of the first portion 31a, the second portion 31b, and the third portion 31c are arranged on the Y1 direction side, which is inward from the end portion 21c of the filter housing 21 extending in the Y direction. As a result, all portions of the main circuit wiring 31 are located on the Y1 direction side, which is inward from the filter housing 21, and therefore it is possible to prevent the envelope volume of the power conversion device 100 from becoming larger due to the main circuit wiring 31.

[0045] In the above embodiment, the crimp terminal 31e is attached to one end of the main circuit wiring 31. This makes it easier to fix the main circuit wiring 31 with a fastening member and makes it less likely that the fixed state will be released, compared to when the main circuit wiring 31 is fixed to the terminal block 12 without the crimp terminal 31e.

[0046] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0047] For example, in the above embodiment, the first connecting conductor arranged outside the first surface 11a of the power conversion housing 11 and the first surface 21a of the filter housing 21 is the main circuit wiring 31 through which AC power is transmitted between the power conversion unit 10 and the filter unit 20, and the second connecting conductor arranged on the bottom surface 11b of the power conversion housing 11 that is different from the first surface 11a of the power conversion housing 11 and on the top surface 21b of the filter housing 21 that is different from the first surface 21a of the filter housing 21 is the earth conductor 32 connected to the earth G. However, the present invention is not limited to this. In the present invention, the first connecting conductor arranged outside the first surface 11a of the power conversion housing 11 and the first surface 21a of the filter housing 21 may be the earth conductor 32, and the second connecting conductor arranged on the bottom surface 11b of the power conversion housing 11 that is different from the first surface 11a of the power conversion housing 11 and on the top surface 21b of the filter housing 21 that is different from the first surface 21a of the filter housing 21 may be the main circuit wiring 31. In addition, all or part of the wiring of the multiple main circuit wirings 31 may be attached to a surface of the power conversion housing 11 other than the first surface 11a and the bottom surface 11b, and the earth conductor 32 may be attached to a surface of the filter housing 21 other than the first surface 21a and the top surface 21b.

[0048] Furthermore, in the above embodiment, the power conversion housing 11 includes the opening 11c provided on the side facing the filter housing 21, and the ground conductor 32 is disposed by being stacked on the filter housing 21 and configured to block the opening 11c of the power conversion housing 11. However, the present invention is not limited to this. In the present invention, the power conversion housing 11 may not include the opening 11c and may have a rectangular parallelepiped shape with six closed sides. In this case, if the bottom surface 11b of the power conversion housing 11, which is the surface facing the filter housing 21, is made of metal, it will be electrically connected to the filter housing 21, and therefore the bottom surface 11b will also function as the ground conductor 32.

[0049] In the above embodiment, the earth conductor 32 is a flat conductor that extends in the X and Y directions perpendicular to the Z direction, which is the stacking direction of the power conversion housing 11 and the filter housing 21, and has a contact surface 32a that is in surface contact with the top surface 21b of the filter housing 21. However, the present invention is not limited to this. In the present invention, for example, the earth conductor 32 may be configured to be in point contact with the top surface 21b of the filter housing 21, or may be connected by a cable-like wiring.

[0050] In the above embodiment, the earth conductor 32 includes the protrusion 32b that protrudes from the position where the contact surface 32a is located toward the Z1 direction, which is inside the power conversion housing 11. However, the present invention is not limited to this. In the present invention, the earth conductor 32 may be, for example, a flat conductor that does not include the protrusion 32b.

[0051] In the above embodiment, the earth conductor 32 is fixed to the filter housing 21 by the same bolt B as the bolt B, which is a fastening member that fastens the power conversion housing 11 and the filter housing 21, but the present invention is not limited to this. In the present invention, the earth conductor 32 may be fixed to the filter housing 21 by using a fixing member that is provided separately from the bolt B, which is a fastening member that fastens the power conversion housing 11 and the filter housing 21.

[0052] In the above embodiment, the main circuit wiring 31 is formed of a single wire having a circular cross section, but the present invention is not limited to this. In the present invention, the main circuit wiring 31 may be formed of, for example, a single wire having a rectangular cross section. Furthermore, the main circuit wiring 31 may be formed of a stranded wire.

[0053] In the above embodiment, the power conversion unit 10 and the filter unit 20 are arranged to be stacked in the Z direction, and the main circuit wiring 31 includes a linear first portion 31a extending in the Z direction, which is the stacking direction of the power conversion unit 10 and the filter unit 20, a second portion 31b extending toward the power conversion unit 10, and a third portion 31c extending toward the filter unit 20, and the positions of the first portion 31a, the second portion 31b, and the third portion 31c in the Y direction perpendicular to the Z direction are located on the Y1 direction side, which is inside the end portion 21c of the filter housing 21 extending in the Y direction, but the present invention is not limited to this. In the present invention, the position of the main circuit wiring 31 may be adjusted as appropriate depending on the surfaces of the power conversion unit 10 and the filter unit 20 to which the main circuit wiring 31 is attached.

[0054] In the above embodiment, the crimp terminal 31e is attached to one end of the main circuit wiring 31, but the present invention is not limited to this. In the present invention, crimp terminals 31e may be provided at both ends of the main circuit wiring 31. Also, for example, the exposed solid wire portion such as the third portion 31c may be fixed to a terminal block or the like with screws, or the solid wire may be attached to the terminal block 12 or the terminal block 23 using a drilled solid wire.

[0055] In the above embodiment, the power conversion device 100 includes an inverter circuit I, and is used for driving a motor M as a load, i.e., as a so-called motor drive application. However, the present invention is not limited to this. In the present invention, the power conversion device 100 may be used for any load that operates on AC. Furthermore, the power conversion device 100 may be configured, for example, as a converter circuit. In this case, the load may be a load that operates on DC.

[0056] In the above embodiment, the power conversion housing 11 is made of PPS resin, the filter housing 21 and the ground conductor 32 are made of aluminum, and the main circuit wiring 31 is made of copper, but the present invention is not limited to this. In the present invention, the power conversion housing 11 may be made of any insulating material, and the filter housing 21, the ground conductor 32, and the main circuit wiring 31 may be made of any conductive metal.

[0057] In the above embodiment, the power conversion device 100 includes the wiring cover 40 that covers the first surface 11a of the power conversion casing 11 and the first surface 21a of the filter casing 21, but the present invention is not limited to this. In the present invention, the wiring cover 40 does not have to be provided. [Explanation of symbols]

[0058] 10 Power conversion section 11 Power conversion enclosure 11a First surface of electrode conversion housing 11b Bottom surface (second surface of electrode conversion housing) 11c Opening of electrode conversion housing 20 Filter section 21 Filter housing 21a First surface of filter housing 21b Top surface (second surface of the filter housing) 21c End (of filter housing) 30 Connecting conductor 31 Main circuit wiring (main circuit conductor) 31a Part 1 31b Part 2 31c 3rd part 31e Crimp terminal 32 Earth conductor 32a Contact surface 32b Protrusion 40 Wiring cover 100 Power conversion device

Claims

1. a power conversion unit including a power conversion housing that accommodates a power conversion element; a filter section including a filter housing that houses a filter element; a first connection conductor disposed outside the first surface of the power conversion housing and the first surface of the filter housing, the first connection conductor electrically connecting the power conversion unit and the filter unit; a second connecting conductor arranged on a second surface of the power conversion housing different from the first surface of the power conversion housing and on a second surface of the filter housing different from the first surface of the filter housing, the second connecting conductor electrically connecting the power conversion unit and the filter unit.

2. the first connection conductor disposed outside the first surface of the power conversion housing and the first surface of the filter housing is a main circuit conductor through which AC power is transmitted between the power conversion unit and the filter unit, 2. The power conversion device according to claim 1, wherein the second connecting conductor arranged on a second surface of the power conversion housing different from the first surface of the power conversion housing and on the second surface of the filter housing different from the first surface of the filter housing is an earth conductor connected to earth.

3. the power conversion housing includes an opening provided on a side facing the filter housing, The power conversion device according to claim 2 , wherein the earth conductor is disposed in a stacked manner on the filter housing and configured to close the opening of the power conversion housing.

4. 4. The power conversion device according to claim 3, wherein the earth conductor is a flat conductor extending in a direction perpendicular to a stacking direction in which the power conversion housing and the filter housing are stacked, and having a contact surface that is in surface contact with a top surface of the filter housing.

5. the power conversion unit includes a fan that generates cooling air inside the power conversion housing, The power conversion device according to claim 4 , wherein the ground conductor includes a protrusion that protrudes from a position where the contact surface is disposed toward an inside of the power conversion housing.

6. The power conversion device according to claim 2 , wherein the ground conductor is fixed to the filter housing by the same fastening member that also fastens the power conversion housing and the filter housing.

7. The power conversion device according to claim 2 , wherein the main circuit conductor is formed of a single wire having a circular cross section.

8. the power conversion unit and the filter unit are arranged in a stacked manner, the main circuit conductor includes a linear first portion extending in a stacking direction in which the power conversion unit and the filter unit are stacked, a second portion extending toward the power conversion unit, and a third portion extending toward the filter unit, 8. The power conversion device according to claim 7, wherein a horizontal position of each of the first portion, the second portion, and the third portion, which is perpendicular to the stacking direction, is located more inward than an end portion of the filter housing extending in the horizontal direction.

9. The power conversion device according to claim 7 , wherein the main circuit conductor has a crimp terminal attached to one end thereof.

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