Power conversion device

Abstract

One aspect of a power conversion device according to the present invention comprises: a motor driver module having a power module that performs power conversion and a drive substrate that switches elements in the power module; a capacitor module electrically connected to the motor driver module; and a resin cooling jacket having a refrigerant flow path. The cooling jacket has: a first portion that is disposed on one side of the capacitor module in a first direction and is provided with a first refrigerant flow path extending in a second direction orthogonal to the first direction; and second portions that are disposed on one side and the other side of the capacitor module in the second direction, respectively, and are provided with a second refrigerant flow path connected to the first refrigerant flow path and extending to the other side in the first direction. The cooling jacket has a U-shape when viewed from a third direction orthogonal to both the first direction and the second direction.

Description

Power conversion device

[0001] The present invention relates to a power conversion device. This application claims priority based on Japanese Patent Application No. 2025-025860 filed in Japan on February 20, 2025, and incorporates the content herein by reference.

[0002] Conventionally, a power conversion device including a plurality of electronic components constituting a power conversion circuit and a cooler for cooling the electronic components is known (see Patent Document 1 below). The electronic components include a semiconductor module incorporating a switching element, a capacitor, and the like. This power conversion device is configured to convert DC power supplied from a DC power source into AC power by turning on and off the switching element. When the power conversion device operates, the electronic components generate heat. Therefore, the cooler is used to cool the electronic components.

[0003] Japanese Patent Application Laid-Open No. 2018-057190

[0004] In Patent Document 1, since the refrigerant flow path provided in the cooling jacket surrounds the electronic components on all sides, there is a problem that the device becomes large-sized.

[0005] The present invention has been made in consideration of the above points, and an object thereof is to provide a power conversion device capable of suppressing an increase in size.

[0006] One aspect of the power conversion device of the present invention includes a motor driver module having a power module that performs power conversion and a drive board that switches and drives elements in the power module, a capacitor module electrically connected to the motor driver module, and a resin cooling jacket having a refrigerant flow path. The cooling jacket is disposed on one side of the capacitor module in a first direction, and includes a first portion having a first refrigerant flow path extending in a second direction orthogonal to the first direction, and a second portion disposed on one side and the other side of the capacitor module in the second direction, respectively, and having a second refrigerant flow path connected to the first refrigerant flow path and extending to the other side in the first direction. The power conversion device is U-shaped when viewed from a third direction orthogonal to both the first direction and the second direction.

[0007] According to one aspect of the present invention, it is possible to provide a power conversion device that can suppress the increase in size.

[0008] Figure 1 is a perspective view of the power converter according to this embodiment. Figure 2 is an exploded perspective view of the power converter according to this embodiment. Figure 3 is a cross-sectional view taken along line A-A in Figure 2. Figure 4 is a plan view of the inverter module seen from above. Figure 5 is a cross-sectional view taken along line B-B in Figure 4. Figure 6 is a perspective view taken from above showing the main components of the capacitor module and the second capacitor module. Figure 7 is a perspective view of the inverter module seen from below. Figure 8 is an exploded perspective view of the cooling jacket seen from below. Figure 9 is a cross-sectional view taken along line C-C in Figure 3. Figure 10 is a cross-sectional view taken along line D-D in Figure 8. Figure 11 is a cross-sectional view taken along line E-E in Figure 9. Figure 12 is a circuit diagram of the power converter according to this embodiment.

[0009] The following description of a power conversion device according to an embodiment of the present invention will be made with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily modified within the scope of the technical idea of ​​the present invention. Furthermore, in the following drawings, the scale and number of components in each structure may differ from the actual structure in order to make the components easier to understand.

[0010] In the following explanation, the first direction D1 will be shown in each figure as appropriate. The first direction D1 is the front-to-back direction of the power converter 10. In the following explanation, the side in which the arrow of the first direction D1 points (+D1 side) will be referred to as the "front side". The side opposite to the side in which the arrow of the first direction D1 points (-D1 side) will be referred to as the "rear side". The "front side" corresponds to the "other side of the first direction". The "rear side" corresponds to the "one side of the first direction".

[0011] In the following description, the third direction D3 will be shown in each figure as appropriate. In this embodiment, the third direction D3 is the vertical direction of the power converter 10. In the following description, the side in which the arrow of the third direction D3 points (+D3 side) will be referred to as the "upper side". The side opposite to the side in which the arrow of the third direction D3 points (-D3 side) will be referred to as the "lower side". The "upper side" corresponds to "one side of the third direction". The "lower side" corresponds to "the other side of the third direction".

[0012] In the following explanation, the second direction D2 will be shown in each figure as appropriate. The second direction D2 is perpendicular to both the first direction D1 and the third direction D3. The second direction D2 is the left-right direction of the power converter 10. In the following explanation, the side in which the arrow of the second direction D2 points (+D2 side) will be referred to as the "right side". The side opposite to the side in which the arrow of the second direction D2 points (-D2 side) will be referred to as the "left side". The "right side" corresponds to "one side of the second direction". The "left side" corresponds to "the other side of the second direction".

[0013] Note that the terms "upper side," "lower side," "right side," "left side," "front side," and "rear side" are merely names used to describe the relative positional relationships of each part, and the actual arrangement may differ from those indicated by these names.

[0014] Figure 1 is a perspective view of the power converter 10. Figure 2 is an exploded perspective view of the power converter 10. The power converter 10 converts a DC current supplied from an external power source (not shown) into an AC current and supplies it to a motor (not shown).

[0015] A motor is, for example, a drive device mounted on a vehicle that rotates the vehicle's axle. The motor is driven by an electric current supplied from the power converter 10. Vehicles equipped with motors are vehicles that use motors as a power source, such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and electric vehicles (EVs).

[0016] As shown in Figures 1 and 2, the power converter 10 comprises an inverter module 11, a case 60, and a cover 66. The case 60 has an opening on the top and houses the inverter module 11 inside. The cover 66 is attached to the top of the case 60. The cover 66 covers and closes the opening of the case 60 that houses the inverter module 11 from above.

[0017] The cover 66 has an opening 67 that penetrates in a third direction D3. The opening 67 is rectangular in shape and extends in a second direction D2. The cover 66 is provided with a lid portion 68 that covers the opening 67 from above. The lid portion 68 can be attached to and detached from the cover 66 by fastening and unfastening with a plurality of (three in Figure 2) set screws 69.

[0018] Figure 3 is a cross-sectional view taken along line A-A in Figure 2. As shown in Figures 2 and 3, the inverter module 11 comprises a motor driver module 20, a capacitor module 30, a cooling jacket 40, a second capacitor module 50, and a control board 70.

[0019] The motor driver module 20 includes a power module 21 and a drive board 22. The drive board 22 is positioned above the power module 21. The power module 21 converts the input DC current into AC current. In other words, the power module 21 performs power conversion. The drive board 22 switches and drives the elements within the power module.

[0020] Figure 4 is a plan view of the inverter module 11, excluding the control board 70, as seen from above. Figure 5 is a cross-sectional view taken along line B-B in Figure 4. As shown in Figures 4 and 5, the drive board 22 is fixed to the upper surface of a projection 21a that protrudes upward from the power module 21 by screws from above. The power module 21 is a plate-shaped structure arranged in a direction that expands in the first direction D1 and the second direction D2. The drive board 22 is a plate-shaped structure arranged in a direction that expands in the first direction D1 and the second direction D2. Therefore, the motor driver module 20 is arranged in a direction that expands in the first direction D1 and the second direction D2.

[0021] By arranging the motor driver module 20 to extend in the first direction D1 and the second direction D2, the inverter module 11 and the power converter 10 can be made lower in the third direction D3 compared to when the motor driver module 20 is arranged to extend in the third direction D3.

[0022] As shown in Figure 4, the power module 21 has three first busbar connections 46, three second busbar connections 47, three output terminals 48, and a plurality of switching elements 21A (see Figure 12). The switching elements 21A constitute at least an inverter circuit.

[0023] The three first busbar connection points 46 are provided at intervals in the second direction D2 along the front side edge of the power module 21. The three second busbar connection points 47 are arranged at intervals to the right of each of the three first busbar connection points 46. Each of the first busbar connection points 46 is connected from above to the connection terminal 72A of the first busbar 72 of the capacitor module 30, which will be described later. Each of the second busbar connection points 47 is connected from above to the connection terminal 73A of the second busbar 73 of the capacitor module 30, which will be described later.

[0024] The three output terminals 48 are provided along the front side edge of the power module 21, spaced apart in the second direction D2. A busbar 53 is connected to each output terminal 48 and fixed from above by a fastening member 48A.

[0025] The busbar 53 is connected to a current sensor 80 that detects the three-phase drive current to the motor. The current sensor 80 has a three-phase output unit 81 that outputs the three-phase drive currents. The current sensor 80 is located on the rear side of the motor driver module 20. The current sensor 80 is fastened from above to the case 60 at fixing parts 52 provided at both ends in the second direction D2.

[0026] As shown in Figures 3 and 5, the power module 21 is provided with a heat sink 24 on its lower side. The heat sink 24 is composed of multiple cylindrical pins that extend downward from the power module 21 and are spaced apart. The heat sink 24 is arranged, for example, in a staggered pattern. In a staggered pattern, multiple rows of pins are arranged in a first direction D1 at a constant pitch, and these rows are spaced apart in a second direction D2, with the positions of the pins in adjacent rows in the second direction D2 being shifted by half a pitch. Alternatively, the heat sink 24 may be arranged in a grid pattern, where multiple rows of pins are arranged in a first direction D1 at a constant pitch, and these rows are spaced apart in the second direction D2, and the positions of the pins in the first direction D1 are the same in all rows. The heat sink 24 may be molded integrally with the power module 21. The heat sink 24 may also be a separate component from the power module 21. The heatsink 24 may be provided on the upper side of the cooling jacket 40, which will be described later, and may be configured to be joined to the lower surface of the power module 21 when the power module 21 is fixed to the upper side of the cooling jacket 40. The heatsink 24 may be made of resin or metal. From the viewpoint of thermal conductivity, the heatsink 24 is preferably made of metal such as copper or aluminum.

[0027] The capacitor module 30 is electrically connected to the motor driver module 20. Figure 6 is a top-view perspective showing the main components of the capacitor module 30 and the second capacitor module 50. As shown in Figure 6, the capacitor module 30 includes a smoothing capacitor 71, a first busbar 72, and a second busbar 73. The smoothing capacitor 71 is located in the high-voltage DC line and smooths the current pulsation in the high-voltage DC line generated by the switching of the power module 21. Multiple smoothing capacitors 71 are stacked together.

[0028] Figure 7 is a perspective view of the inverter module 11 from below. As shown in Figures 6 and 7, the first busbar 72 has a connection terminal 72A, a power terminal 72B, and a first terminal 72C. The second busbar 73 has a connection terminal 73A, a power terminal 73B, and a first terminal 73C. As described above, the connection terminals 72A and 73A are bent and extend to the rear, and are connected to the first busbar connection portion 46 and the second busbar connection portion 47 of the power module 21, respectively.

[0029] Power terminal 72B is bent and extends forward, positioned above the smoothing capacitor 71. Power terminal 72B is screwed to power cable 64A, which has one of the polarities of the pair of power cables 64. Power terminal 73B is located to the left of power terminal 72B, bent and extends forward, positioned above the smoothing capacitor 71. Power terminal 73B is screwed to power cable 64B, which has the other polarity of the pair of power cables 64.

[0030] A pair of power cables 64 supply, for example, direct current from a battery. Power cables 64A and 64B are introduced into the case 60 via a ferrite core 93 to remove noise, while being inserted through and held by a second cylindrical member 62, as shown in Figure 2. The second cylindrical member 62 is attached to a protruding wall 65 having a mounting opening 65A, which is provided on the front-facing side wall 63 of the case 60.

[0031] At least a portion of the aforementioned opening 67 overlaps with the power terminals 72B and 73B in the third direction D3. Because at least a portion of the opening 67 overlaps with the power terminals 72B and 73B in the third direction D3, the power cables 64A and 64B can be screwed to and unscrewed from the power terminals 72B and 73B, respectively, through the opening 67 that is exposed when the lid 68 is detached from the cover 66. In other words, because at least a portion of the opening 67 overlaps with the power terminals 72B and 73B in the third direction D3, the power cables 64A and 64B can be easily screwed to and unscrewed from the power terminals 72B and 73B, respectively, without removing the cover 66 from the case 60. Furthermore, by making the opening 67 larger than the power terminals 72B and 73B, the screwing and unscrewing operations can be made easier. For example, when screwing a power cable 64A to a power terminal 72B, it is necessary to align the position of the power cable 64A with the power terminal 72B. Therefore, by enlarging the opening 67, the work efficiency can be improved by gripping the power cable 64A with a tool inserted into the opening 67 and aligning it with the power terminal 72B.

[0032] The first terminal 72C is located on the right side of the capacitor module 30 and extends from the bottom to the rear of the first busbar 72. The first terminal 72C is connected to the second terminal 51A of the second capacitor module 50. The first terminal 72C and the second terminal 51A are screwed to the metal nut member 43A from below by screwing a set screw 74A into the nut member 43A. The first terminal 73C is located on the left side of the capacitor module 30 and extends from the bottom to the rear of the second busbar 73. The first terminal 73C is connected to the second terminal 51B of the second capacitor module 50. The first terminal 73C and the second terminal 51B are screwed to the metal nut member 43B from below by screwing a set screw 74B into the nut member 43B.

[0033] Nut members 43A and 43B are embedded in the cooling jacket 40 from below. As shown in Figure 8, nut members 43A and 43B are trapezoidal when viewed from the third direction D3. Details of nut members 43A and 43B in the cooling jacket 40 will be described later.

[0034] The second capacitor module 50 is located behind the capacitor module 30. The second capacitor module 50 is electrically connected to the motor driver module 20 via the first busbar 72 and the second busbar 73 by the connection of the second terminals 51A and 51B described above to the first terminals 72C and 73C. The second capacitor module 50 has an X capacitor and a Y capacitor (not shown). The second capacitor module 50 removes noise from the power line.

[0035] The cooling jacket 40 is made of resin. The cooling jacket 40 has a refrigerant flow path 40A through which the refrigerant flows. The refrigerant is, for example, LLC (Long Life Coolant). As shown in Figures 5, 7-10, the cooling jacket 40 has a first part 41, a second part 42, and a cover member 75.

[0036] The first portion 41 is located on the rear side of the capacitor module 30. The first portion 41 includes a first refrigerant flow path 41A extending in a second direction D2. The first refrigerant flow path 41A is rectangular when viewed from above. The first refrigerant flow path 41A is a space that is recessed downward from the upper surface of the first portion 41 and opens to the upper surface of the first portion 41. The first refrigerant flow path 41A faces the heat sink 24, into which the heat sink 24 is inserted from above.

[0037] The second portion 42 is positioned on the right and left sides of the capacitor module 30 in the second direction D2, respectively. The second portion 42 extends forward from the first portion 41. The cooling jacket 40 is U-shaped and opens forward when viewed from the third direction D3. The U-shape of the cooling jacket 40 when viewed from the third direction D3 allows for a shorter dimension in the first direction D1 compared to a rectangular shape, thereby suppressing an increase in the size of the power converter 10.

[0038] The second section 42 includes a second refrigerant flow path 42A. The second refrigerant flow path 42A connects to the first refrigerant flow path 41A and extends forward. The right and left second refrigerant flow paths 42A extend in an oblique direction, approaching each other as they move towards the rear when viewed from the third direction D3, and connect to the first refrigerant flow path 41A.

[0039] As shown in Figures 3 and 5, the first portion 41 and the first refrigerant flow path 41A are positioned above the second condenser module 50. The second portion 42 and the second refrigerant flow path 42A are positioned to the right and left of the second condenser module 50, respectively. The second refrigerant flow path 42A is positioned below the first refrigerant flow path 41A. The cooling jacket 40 is U-shaped, opening downwards when viewed from the first direction D1. The U-shape of the cooling jacket 40 when viewed from the first direction D1 allows for a shorter dimension in the third direction D3 compared to a rectangular shape, further suppressing the increase in size of the power converter 10.

[0040] The second refrigerant flow path 42A opens to the front end face 42B of the second portion 42 and to the downward-facing end face 42C located at a position rearward from the end face 42B. At least the second refrigerant flow path 42A extending diagonally has a groove 42D that opens to the end face 42C. The groove 42D is closed when the cover member 75 is joined and fixed to the end face 42C from below. Because the second refrigerant flow path 42A extending diagonally has a groove 42D that opens to the end face 42C, for example, when manufacturing the cooling jacket 40 by injection molding, the second refrigerant flow path 42A extending diagonally can be molded without using a mold with a complex structure, thereby improving manufacturing efficiency.

[0041] As shown in Figures 8 and 9, the cooling jacket 40 has a recess 42E separated from a second refrigerant flow path 42A that extends diagonally and a partition wall 45. The partition wall 45 extends diagonally along the second refrigerant flow path 42A. The recess 42E opens downward in the cooling jacket 40. Nut members 43A and 43B are fixed to the recess 42E. In other words, the nut members 43A and 43B are provided in the cooling jacket 40 separated from the second refrigerant flow path 42A that extends diagonally and the partition wall 45.

[0042] The nut members 43A and 43B are trapezoidal in shape such that the sides in contact with the partition wall 45 when viewed from the third direction D3 extend in an oblique direction. Since the nut members 43A and 43B are trapezoidal when viewed from the third direction D3, rotation of the nut members 43A and 43B can be suppressed when screwing and unscrewing the first terminals 72C and 72D, and the second terminals 51A and 51B to and from the nut members 43A and 43B using the set screws 74A and 74B.

[0043] Further, since the nut members 43A and 43B are trapezoidal when viewed from the third direction D3, the distance between the sides of the nut members 43A and 43B in contact with the partition wall 45 and the second refrigerant flow path 42A can be minimized. Therefore, the cooling efficiency of the nut members 43A and 43B can be enhanced, and the first terminals 72C and 72D, and the second terminals 51A and 51B screwed to the nut members 43A and 43B can be effectively cooled.

[0044] Among the nut members 4A and 43B, as typically shown in FIG. 11, for the nut member 43A, the end portion on the upper side (bottom side of the groove portion 42D) of the nut member is located above the bottom of the groove portion 42D. Since the upper end portion of the nut member 43A is located above the bottom of the groove portion 42D, the length in which the nut member 43A and the groove portion 42D face each other in the second direction D2 in the third direction D3 becomes longer, and the cooling efficiency of the nut member 43A can be enhanced. Therefore, the first terminals 72C and 72D, and the second terminals 51A and 51B screwed to the nut members 43A and 43B can be more effectively cooled.

[0045] Part 2 42 is connected to a first cylindrical member 61. The first cylindrical member 61 is cylindrical and extends in a first direction D1. The first cylindrical member 61 is provided on a front-facing side wall 63 in the case 60 and is attached to a protruding wall 91 having a mounting port 91A. When the first cylindrical member 61 is attached to the protruding wall 91, the rear side is inserted into the case 60 through the mounting port 91A. The first cylindrical member 61 inserted into the case 60 is fitted and connected to the front side of the second part 42 as shown in FIGS. 9 and 10. The first cylindrical member 61 has a third refrigerant flow path 61A inside. The third refrigerant flow path 61A communicates with the second refrigerant flow path 42A when the first cylindrical member 61 is connected to the second part 42.

[0046] One of the left and right first cylindrical members 61 is an introduction part of the refrigerant into the refrigerant flow path 40A. The other of the left and right first cylindrical members 61 is a discharge part of the refrigerant from the refrigerant flow path 40A. The refrigerant is introduced from one of the left and right first cylindrical members 61 into the refrigerant flow path 4PA and cools the motor driver module 20 etc. via the heat sink 24 by heat exchange. The refrigerant whose temperature has risen by heat exchange is discharged from the refrigerant flow path 40A from the other of the left and right first cylindrical members 61.

[0047] Since the first cylindrical member 61 and the second cylindrical member 62 are provided on the front-facing side wall 63 in the case 60, piping, wiring work, maintenance work, etc. during the assembly of the power conversion device 10 can be carried out from one direction, improving workability.

[0048] The first cylindrical member 61 and the second cylindrical member 62 are arranged on the side wall 63 with different positions in a third direction D3. The first cylindrical member 61 is arranged below the second cylindrical member 62. By arranging the first cylindrical member 61 below the second cylindrical member 62, even if the refrigerant leaks from the first cylindrical member 61, it is possible to suppress an adverse effect on the power cable 64 held by the second cylindrical member 62.

[0049] The control board 70 is located above the motor driver module 20. The control board 70 is electrically connected to the drive board 22 via a connector 92 (see Figures 4 and 5). The control board 70 controls the power supply to the motor via the drive board 22. As shown in Figure 12, the control board 70 controls the drive board 22 to output a signal that drives the switching element 21A of the power module 21. As a result, a three-phase drive current to the motor is output via the current sensor 80.

[0050] As described above, in the power converter 10 of this embodiment, the cooling jacket 40 is U-shaped and has a first portion 41 that is positioned behind the condenser module 30 when viewed from the third direction D3 and has a first refrigerant flow path 41A extending in the second direction D2, and a second portion 42 that is positioned on the right and left sides of the condenser module 30, respectively, and has a second refrigerant flow path 42A that connects to the first refrigerant flow path 41A and extends forward. Therefore, the dimension in the first direction D1 can be shortened, and the size of the power converter 10 can be suppressed.

[0051] Furthermore, in the power converter 10 of this embodiment, the first portion 41 is positioned above the second capacitor module 50, the second portion 42 is positioned to the right and left of the second capacitor module 50, respectively, and the cooling jacket 40 is U-shaped when viewed from the first direction D1, so the dimension in the third direction D3 can be shortened, making it possible to further suppress the increase in size of the power converter 10.

[0052] Furthermore, in the power conversion device 10 of this embodiment, since the motor driver module 20 is arranged in a direction that extends in the first direction D1 and the second direction D2, the inverter module 11 and the power conversion device 10 can be made lower in height with respect to the third direction D3.

[0053] In the power conversion device 10 of this embodiment, the first terminals 72C and 73C of the capacitor module 30 and the second terminals 51A and 51B of the second capacitor module 50 are screwed to metal nut members 43A and 43B provided on a resin cooling jacket, respectively. Therefore, there is no need to separately provide a member to insulate the screwed-in parts, which contributes to simplifying the device and reducing costs.

[0054] Furthermore, in the power conversion device 10 of this embodiment, since the nut members 43A and 43B are trapezoidal when viewed from the third direction D3, the distance to the second refrigerant flow path 42A, which extends diagonally, can be minimized when the nut members 43A and 43B are separated by a partition wall 45, thereby effectively cooling the first terminal 72C and the second terminal 51A, and the first terminal 73C and the second terminal 51B, which are screwed to the nut members 43A and 43B.

[0055] Furthermore, in the power conversion device 10 of this embodiment, the upper ends (bottom ends of the groove 42D) of the nut members 43A and 43B are located above the bottom of the groove 42D. As a result, the length of the nut members 43A and 43B and the groove 42D facing each other in the second direction D2 in the third direction D3 is increased, thereby improving the cooling efficiency of the nut members 43A and 43B. Therefore, the first terminal 72C and the second terminal 51A, and the first terminal 73C and the second terminal 51B, which are screwed to the nut members 43A and 43B, can be cooled even more effectively.

[0056] In the power converter 10 of this embodiment, the first cylindrical member 61 and the second cylindrical member 62 are provided on the side wall 63 facing forward in the case 60, so that piping, wiring, and maintenance work during assembly of the power converter 10 can be performed from one direction, improving work efficiency. Furthermore, in the power converter 10 of this embodiment, the first cylindrical member 61 and the second cylindrical member 62 are arranged on the side wall 63 at different positions in the third direction D3, so, for example, by positioning the first cylindrical member 61 below the second cylindrical member 62, even if refrigerant leaks from the first cylindrical member 61, adverse effects on the power cable 64 held by the second cylindrical member 62 can be suppressed.

[0057] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these examples. The shapes and combinations of the constituent members shown in the above examples are merely examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0058] Furthermore, this technology can take the following configurations: (1) A power conversion device comprising: a motor driver module having a power module that performs power conversion and a drive board that switches-drives elements in the power module; a capacitor module electrically connected to the motor driver module; and a resin cooling jacket having a refrigerant flow path, wherein the cooling jacket has a first portion arranged on one side of the capacitor module in a first direction and having a first refrigerant flow path extending in a second direction perpendicular to the first direction; and a second portion arranged on one and the other side of the capacitor module in the second direction, respectively, and having a second refrigerant flow path connected to the first refrigerant flow path and extending to the other side of the first direction, and is U-shaped when viewed from a third direction perpendicular to both the first and second directions. (2) The power conversion device according to (1), wherein the motor driver module is arranged in a direction that spreads out in the first and second directions. (3) The power conversion device according to (1) or (2), further comprising a second capacitor module disposed on one side of the capacitor module in the first direction and electrically connected to the motor driver module, wherein the cooling jacket has a first portion disposed on one side of the second capacitor module in the third direction and a second portion disposed on one side and the other side of the second capacitor module in the second direction, respectively, and is U-shaped when viewed from the first direction. (4) The power conversion device according to (3), wherein the capacitor module has a first terminal connected to the second capacitor module, the second capacitor module has a second terminal connected to the first terminal, and the cooling jacket has a metal nut member provided thereon, to which the first terminal and the second terminal are screwed. (5) The power conversion device according to (4), wherein the refrigerant flow path has a groove that opens to the other side of the cooling jacket in the third direction, the nut member is provided separated from the refrigerant flow path by a partition wall, and the end of the nut member on the other side in the third direction is located on the other side in the third direction than the bottom of the groove. (6) The power conversion device according to (5), wherein the nut member is trapezoidal when viewed from the third direction.(7) The power conversion device according to any one of (1) to (6), comprising: a case housing at least the condenser module and the cooling jacket; a first cylindrical member attached to the case, having a third refrigerant flow path that communicates with the second refrigerant flow path when connected to the second portion; and a second cylindrical member attached to the case, holding a power cable introduced into the interior of the case, wherein the first cylindrical member and the second cylindrical member are attached to the same side wall of the case facing the other side in the first direction. (8) The power conversion device according to (7), wherein the first cylindrical member and the second cylindrical member are positioned differently in the third direction. (9) The power conversion device according to (7) or (8), comprising: a power terminal disposed inside the case and to which the power cable is screwed; a cover that covers the opening of the case from one side in the third direction; and a lid portion that is detachably provided on the cover and covers an opening that penetrates the cover in the third direction, wherein at least a portion of the opening overlaps with the power terminal in the third direction.

[0059] 10...Power converter, 11...Inverter module, 20...Motor driver module, 21...Power module, 22...Drive board, 30...Capacitor module, 40...Cooling jacket, 41...First part, 41A...First refrigerant flow path, 42...Second part, 42A...Second refrigerant flow path, 42D...Groove, 43A, 43B...Nut member, 50...Second capacitor module, 51A, 51B...Second terminal, 60...Case, 61...First cylindrical member, 61A...Third refrigerant flow path, 62...Second cylindrical member, 63...Side wall, 64, 64A, 64B...Power cable, 66...Cover, 67...Opening, 68...Lid, 72B, 73B...Power terminal, 72C, 73C...First terminal, D1...First direction, D2...Second direction D3...Third direction

Claims

1. A power conversion device comprising: a motor driver module having a power module for power conversion and a drive board for switching-driving elements within the power module; a capacitor module electrically connected to the motor driver module; and a resin cooling jacket having a refrigerant flow path, wherein the cooling jacket has a first portion disposed on one side of the capacitor module in a first direction and having a first refrigerant flow path extending in a second direction perpendicular to the first direction; and second portions disposed on one and the other side of the capacitor module in the second direction, respectively, and having a second refrigerant flow path connected to the first refrigerant flow path and extending to the other side of the first direction, and is U-shaped when viewed from a third direction perpendicular to both the first and second directions.

2. The power conversion device according to claim 1, wherein the motor driver module is arranged in a direction that extends in the first direction and the second direction.

3. The power conversion device according to claim 1 or 2, further comprising a second capacitor module disposed on one side of the capacitor module in the first direction and electrically connected to the motor driver module, wherein the cooling jacket has a first portion disposed on one side of the second capacitor module in the third direction, and a second portion disposed on one side and the other side of the second capacitor module in the second direction, respectively, and is U-shaped when viewed from the first direction.

4. The power conversion device according to claim 3, wherein the capacitor module has a first terminal connected to the second capacitor module, the second capacitor module has a second terminal connected to the first terminal, and the cooling jacket has a metal nut member on which the first terminal and the second terminal are screwed.

5. The power conversion device according to claim 4, wherein the refrigerant flow path has a groove that opens to the other side of the cooling jacket in the third direction, the nut member is provided separated from the refrigerant flow path by a partition wall, and the other end of the nut member in the third direction is located on the other side in the third direction from the bottom of the groove.

6. The power conversion device according to claim 5, wherein the nut member is trapezoidal when viewed from the third direction.

7. A power converter according to claim 1 or 2, comprising: a case housing at least the condenser module and the cooling jacket; a first cylindrical member attached to the case, having a third refrigerant flow path that communicates with the second refrigerant flow path when connected to the second portion; and a second cylindrical member attached to the case, holding a power cable introduced into the interior of the case, wherein the first cylindrical member and the second cylindrical member are attached to the same side wall of the case facing the other side in the first direction.

8. The power conversion device according to claim 7, wherein the first cylindrical member and the second cylindrical member are positioned differently in the third direction.

9. The power conversion device according to claim 7, comprising: a power terminal disposed inside the case and to which the power cable is screwed; a cover that covers the opening of the case from one side in the third direction; and a lid portion that is detachably provided on the cover and covers an opening that penetrates the cover in the third direction, wherein at least a portion of the opening overlaps with the power terminal in the third direction.

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