Electronic device

Abstract

To provide an electronic device which makes molding of a second case member easy.SOLUTION: A case 13 includes: a first case member 21 having a holding wall 23; and a plate-like second case member 22 disposed at the opposite side of a first heating component 11 and a second heating component 12 across the holding wall 23. The holding wall 23 has a step shape having a first holding part 31, a bottom wall part 32 located closer to the second case member 22 side than the first holding part 31, and a connection part 33a connecting the first holding part 31 with the bottom wall part 32. A passage forming member 14 is disposed in a space enclosed by the first holding part 31, the second case member 22, and the connection part 33a. A cooling passage R has: a first passage R1 defined by the first holding part 31 and the passage forming member 14; a second passage R2 defined by the bottom wall part 32 and the second case member 22; and a connection passage R3 defined by the connection part 33a and the passage forming member 14 and connecting the first passage R1 with the second passage R2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to electronic devices. [Background technology]

[0002] The electronic device described in Patent Document 1 includes a first heat generating component and a second heat generating component having different heights, a housing, and a lid. The height of the first heat generating component is higher than the height of the second heat generating component. The housing has a partition wall that contacts the first heat generating component and the second heat generating component. The lid covers an opening of the housing to form a flow path through which a coolant for cooling the first heat generating component and the second heat generating component flows through the partition wall. The partition wall has a stepped shape that matches the heights of the first heat generating component and the second heat generating component so as to contact the first heat generating component and the second heat generating component. The lid has a stepped shape that matches the stepped shape of the partition wall. This forms a flow path that is shaped to follow the stepped shape of the partition wall.

[0003] Instead of making the lid stepped, the lid can also be made convex so as to protrude toward the portion of the partition that comes into contact with the second heat-generating component, thereby forming a flow path shaped to follow the stepped shape of the partition. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-49870 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the lid is formed in a stepped or convex shape, the shape of the lid becomes complicated, making it difficult to form the lid, and therefore it is necessary to form the lid by a costly manufacturing method such as die casting or casting. [Means for solving the problem]

[0006] The electronic device for solving the above problems includes a first case member having a retaining wall for retaining a first heat generating component and a second heat generating component, and a flat second case member arranged on the opposite side of the retaining wall from the first heat generating component and the second heat generating component, and a case having a cooling flow path between the retaining wall and the second case member through which a cooling fluid flows for cooling the first heat generating component and the second heat generating component, the retaining wall including a first retaining section for retaining the first heat generating component, and a second retaining section for retaining the second heat generating component, the second retaining section being located closer to the second case member than the first retaining section. and a connecting portion connecting the first retaining portion and the second retaining portion, and a flow path forming member that is separate from the first case member and the second case member is arranged in a space surrounded by the first retaining portion, the second case member, and the connecting portion, and the cooling flow path has a first flow path partitioned by the first retaining portion and the flow path forming member, a second flow path partitioned by the second retaining portion and the second case member, and a connecting flow path partitioned by the connecting portion and the flow path forming member, connecting the first flow path and the second flow path.

[0007] According to the above configuration, the first flow path and the connection flow path are defined by the first case member and the flow path forming member. Therefore, it is possible to form a cooling flow path having a shape that conforms to the stepped shape of the retaining wall without forming the second case member into a stepped or convex shape. This makes it easy to mold the second case member. As a result, the second case member can be molded by an inexpensive manufacturing method such as pressing, thereby reducing the cost of molding the second case member.

[0008] In the above electronic device, the first case member has a pair of side walls extending from the retaining wall toward the second case member and located on either side of the flow path forming member, and one of the flow path forming member and the pair of side walls has a pair of engaging protrusions protruding toward the other, and the other has a pair of engaging recesses into which the pair of engaging protrusions are inserted.

[0009] According to the above configuration, one of the flow path forming member and the pair of side walls has a pair of engaging protrusions, and the other has a pair of engaging recesses. The pair of engaging protrusions engage with the pair of engaging recesses, thereby fixing the flow path forming member to the case. In this case, it is not necessary to provide a structure for fixing the flow path forming member to the case in the second case member, and therefore molding the second case member is easier.

[0010] In the above electronic device, the first case member may have a pair of side walls extending from the retaining wall toward the second case member and positioned on either side of the flow path forming member, and the flow path forming member may be pressed between the pair of side walls.

[0011] According to the above configuration, the flow path forming member is fixed to the case by being press-fitted between the pair of side walls of the first case member. In this case, it is not necessary to provide the second case member with a structure for fixing the flow path forming member to the case, which makes it easier to mold the second case member.

[0012] In the electronic device, the flow path forming member may be fixed to the first holding portion by a fastening member. According to the above configuration, the flow path forming member is fixed to the first holding portion by the fastening member, thereby fixing the flow path forming member to the case. In this case, it is not necessary to provide the second case member with a structure for fixing the flow path forming member to the case, which makes it easier to mold the second case member.

[0013] In the above electronic device, the first holding portion may hold a plurality of the first heat-generating components in an aligned manner, and the fastening member may be fixed to a portion of the first holding portion located between the first heat-generating components.

[0014] Between the first holding portion and the flow path forming member, the cooling fluid does not flow through the portion where the fastening member is disposed. Therefore, for example, when the fastening member is fixed to a portion of the first holding portion that overlaps with the first heat generating component, the first heat generating component that overlaps with the fastening member is difficult to cool. In contrast, according to the above configuration, the fastening member is fixed to a portion of the first holding portion that is located between the first heat generating components. Therefore, it is easy to cool the first heat generating component. Effect of the Invention

[0015] According to the present invention, the second case member can be easily molded. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing an electronic device according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view illustrating the electronic device according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing an electronic device according to an embodiment. [Diagram 5] FIG. 5 is a bottom view showing an electronic device in a modified example. [Figure 6] FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. [Figure 7] FIG. 7 is a cross-sectional view showing an electronic device according to a modified example. [Figure 8] FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. [Figure 9] FIG. 9 is a cross-sectional view showing an electronic device according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment of an electronic device will now be described with reference to Figures 1 to 4. The electronic device of this embodiment is a power converter. As shown in FIGS. 1 and 2, the electronic device 10 includes a first heat generating component 11, a second heat generating component 12, a case 13, a flow path forming member 14, and a circuit board 15.

[0018] The first heat generating component 11 of this embodiment is a MOSFET. The second heat generating component 12 of this embodiment is a transformer or a coil. The height of the second heat generating component 12 is greater than the height of the first heat generating component 11. The electronic device 10 of this embodiment includes six first heat generating components 11 and two second heat generating components 12. The electronic device 10 may include other heat generating components.

[0019] <Case> The case 13 is made of metal. In this embodiment, the case 13 is made of aluminum. The case 13 has a first case member 21 and a second case member 22.

[0020] The first case member 21 has a retaining wall 23 that retains the first heat generating component 11 and the second heat generating component 12. The retaining wall 23 in this embodiment is a rectangular plate. The first case member 21 in this embodiment has a pair of first side walls 24 as a pair of side walls extending from a pair of long edges of the retaining wall 23, and a pair of second side walls 25 extending from a pair of short edges of the retaining wall 23.

[0021] The second case member 22 has a flat plate shape. The second case member 22 is disposed on the opposite side of the holding wall 23 from the first heat generating component 11 and the second heat generating component 12. The second case member 22 of the present embodiment has a rectangular shape. The size of the second case member 22 of the present embodiment is approximately the same as the size of the first case member 21.

[0022] The pair of first side walls 24 and the pair of second side walls 25 extend from the retaining wall 23 toward the second case member 22. The second case member 22 is connected to the tip surfaces of the pair of first side walls 24 and the tip surfaces of the pair of second side walls 25 of the first case member 21. The second case member 22 closes the opening of the first case member 21.

[0023] 1 and 3, the retaining wall 23 is provided with two accommodating recesses 30 recessed toward the second case member 22. The two accommodating recesses 30 are provided at an interval in the longitudinal direction of the retaining wall 23.

[0024] The six first heat-generating components 11 are held in a portion of the holding wall 23 located between the two accommodating recesses 30. Therefore, the portion of the holding wall 23 located between the two accommodating recesses 30 is a first holding portion 31 that holds the first heat-generating components 11. The six first heat-generating components 11 are arranged side by side in the short side direction of the holding wall 23.

[0025] Each accommodating recess 30 is defined by a rectangular plate-shaped bottom wall portion 32 and a square tubular peripheral wall portion 33 connecting the retaining wall 23 and the bottom wall portion 32. The bottom wall portion 32 is located closer to the second case member 22 than the first retaining portion 31. The tip surfaces of the pair of first side walls 24 and the tip surfaces of the pair of second side walls 25 are located closer to the second case member 22 than the bottom wall portion 32. In this embodiment, a gap is provided between the peripheral wall portion 33 and the pair of first side walls 24 located on both sides of the peripheral wall portion 33, and between the peripheral wall portion 33 and the second side wall 25.

[0026] The second heat generating component 12 is accommodated in the accommodation recess 30. The second heat generating component 12 is held by the bottom wall portion 32. Therefore, the bottom wall portion 32 is a second holding portion that holds the second heat generating component 12. The peripheral wall portion 33 has a connection portion 33a that connects the first holding portion 31 and the bottom wall portion 32 that is the second holding portion. The holding wall 23 has a stepped shape that has the first holding portion 31, the bottom wall portion 32 that is located closer to the second case member 22 than the first holding portion 31, and the connection portion 33a that connects the first holding portion 31 and the bottom wall portion 32.

[0027] 1, the circuit board 15 is disposed so as to cover the opening of the accommodating recess 30. Therefore, the circuit board 15 covers the second heat generating component 12. The first heat generating component 11 and the second heat generating component 12 are electrically connected to the circuit board 15 via lead wires (not shown).

[0028] <Flow path forming member> The flow path forming member 14 is a separate member from the first case member 21 and the second case member 22. The flow path forming member 14 is made of resin.

[0029] 3, the flow path forming member 14 is disposed in a space surrounded by the first holding portion 31, the second case member 22, and the connecting portion 33a. In this embodiment, the flow path forming member 14 is disposed in a space surrounded by the first holding portion 31, the second case member 22, and the two connecting portions 33a. The pair of first side walls 24 are located on both sides of the flow path forming member 14.

[0030] The flow path forming member 14 of this embodiment has a rectangular parallelepiped shape. The flow path forming member 14 has a first surface 14a that faces the first holding portion 31 while being separated from it. The flow path forming member 14 has a second surface 14b that abuts against the second case member 22. The second surface 14b is the surface on the opposite side of the first surface 14a. The flow path forming member 14 has a pair of third surfaces 14c that face the connecting portion 33a while being separated from it. The flow path forming member 14 has a pair of fourth surfaces 14d as a pair of opposing surfaces that face the pair of first side walls 24.

[0031] <Fixing structure of case and flow path forming member> The flow path forming member 14 is fixed to the case 13. In this embodiment, the flow path forming member 14 is fixed to the first case member 21.

[0032] As shown in Figs. 2 and 4, the flow path forming member 14 has a pair of slits 40 recessed from the second surface 14b. The pair of slits 40 are located at both ends of the flow path forming member 14 in the short-side direction of the retaining wall 23. Each slit 40 opens in a pair of third surfaces 14c. The flow path forming member 14 has a pair of engagement portions 41 located closer to the pair of fourth surfaces 14d than the pair of slits 40. The flow path forming member 14 has a pair of engagement protrusions 41a protruding from the pair of fourth surfaces 14d. The pair of engagement protrusions 41a are provided on the pair of engagement portions 41.

[0033] A pair of engagement recesses 24a into which the pair of engagement protrusions 41a are inserted are provided on the inner surfaces of the pair of first side walls 24. Each of the engagement recesses 24a is provided in a portion of the first side wall 24 close to its tip surface.

[0034] The flow path forming member 14 is accommodated in the first case member 21 through the opening of the first case member 21. At this time, the pair of engaging protrusions 41a protrude from the pair of fourth surfaces 14d of the flow path forming member 14 toward the pair of first side walls 24, and thus come into contact with the inner surfaces of the pair of first side walls 24. Then, the pair of engaging portions 41 are elastically deformed in a direction approaching each other by being pressed by the pair of first side walls 24. Then, when the flow path forming member 14 is accommodated to a position where the pair of engaging protrusions 41a face the engaging recesses 24a, the pair of engaging portions 41 deform in a direction away from each other by trying to return to their original shape. As a result, the pair of engaging protrusions 41a are inserted into the pair of engaging recesses 24a, and the flow path forming member 14 is fixed to the first case member 21.

[0035] <Cooling channel> 3, a cooling flow path R through which a cooling fluid flows for cooling the first heat generating component 11 and the second heat generating component 12 is provided between the retaining wall 23 and the second case member 22. The cooling fluid in this embodiment is LLC. The cooling flow path R in this embodiment is defined by the retaining wall 23, the second case member 22, a pair of first side walls 24, and a pair of second side walls 25. Although not shown, the case 13 is formed with an inlet for introducing the cooling fluid from outside the case 13 into the cooling flow path R, and an outlet for discharging the cooling fluid from the cooling flow path R to outside the case 13.

[0036] The cooling flow path R has a first flow path R1 for cooling the first heat generating component 11, a second flow path R2 for cooling the second heat generating component 12, and a connecting flow path R3 for connecting the first flow path R1 and the second flow path R2. The first flow path R1 is defined by the first holding portion 31 and the first surface 14a of the flow path forming member 14. The second flow path R2 is defined by the bottom wall portion 32 and the second case member 22. The connecting flow path R3 is defined by the connecting portion 33a and the third surface 14c of the flow path forming member 14.

[0037] In this embodiment, the bottom wall portion 32 and the connection portion 33a are provided on both sides of the flow path forming member 14. Therefore, the second flow path R2 and the connection flow path R3 are provided on both sides of the first flow path R1. The cooling fluid flows in the order of one second flow path R2 → one connection flow path R3 → first flow path R1 → the other connection flow path R3 → the other second flow path R2. The first heat generating component 11 is cooled via the first holding portion 31 by the cooling fluid flowing through the first flow path R1. The second heat generating component 12 is cooled via the bottom wall portion 32 by the cooling fluid flowing through the second flow path R2. The second heat generating component 12 is also cooled via the connection portion 33a by the cooling fluid flowing through the connection flow path R3.

[0038] In this embodiment, a gap is provided between the peripheral wall portion 33 and each first side wall 24. Therefore, the cooling fluid also flows between the peripheral wall portion 33 and each first side wall 24. The second heat generating component 12 is cooled through the peripheral wall portion 33 by the cooling fluid flowing between the peripheral wall portion 33 and each first side wall 24. In addition, a gap is provided between the peripheral wall portion 33 and the second side wall 25. Therefore, the cooling fluid also flows between the peripheral wall portion 33 and the second side wall 25. The second heat generating component 12 is cooled through the peripheral wall portion 33 by the cooling fluid flowing between the peripheral wall portion 33 and the second side wall 25.

[0039] [Actions and Effects of the Present Embodiment] The operation and effects of this embodiment will be described. (1) The case 13 has a first case member 21 and a second case member 22. The first case member 21 has a holding wall 23 that holds the first heat generating component 11 and the second heat generating component 12. The second case member 22 is flat. The second case member 22 is disposed on the opposite side of the holding wall 23 from the first heat generating component 11 and the second heat generating component 12. Between the holding wall 23 and the second case member 22, a cooling flow path R is provided through which a cooling fluid flows for cooling the first heat generating component 11 and the second heat generating component 12. The holding wall 23 has a first holding portion 31 that holds the first heat generating component 11, a bottom wall portion 32 that is located closer to the second case member 22 than the first holding portion 31 and holds the second heat generating component 12, and a connection portion 33a that connects the first holding portion 31 and the bottom wall portion 32. In the space surrounded by the first holding portion 31, the second case member 22, and the connecting portion 33a, a flow path forming member 14, which is a separate body from the first case member 21 and the second case member 22, is disposed. The cooling flow path R has a first flow path R1, a second flow path R2, and a connecting flow path R3 that connects the first flow path R1 and the second flow path R2. The first flow path R1 is defined by the first holding portion 31 and the flow path forming member 14. The second flow path R2 is defined by the bottom wall portion 32 and the second case member 22. The connecting flow path R3 is defined by the connecting portion 33a and the flow path forming member 14.

[0040] The first flow path R1 and the connection flow path R3 are partitioned by the first case member 21 and the flow path forming member 14. Therefore, it is possible to form the cooling flow path R in a shape that follows the stepped shape of the retaining wall 23, even if the second case member 22 is not formed in a stepped or convex shape. This makes it easy to mold the second case member 22. As a result, the second case member 22 can be molded by an inexpensive manufacturing method such as pressing, and therefore the cost of molding the second case member 22 can be reduced.

[0041] Furthermore, when the second case member 22 is formed into a convex shape, thick and thin portions are generated in the second case member 22, and therefore, it is necessary to mold the second case member 22 so as not to generate shrinkage cavities. In contrast, in this embodiment, the second case member 22 is flat, and therefore the thickness of the second case member 22 is the same. Therefore, molding of the second case member 22 is easy.

[0042] (2) The flow path forming member 14 has a pair of engaging protrusions 41a protruding from a pair of fourth surfaces 14d facing the pair of first side walls 24. A pair of engaging recesses 24a into which the pair of engaging protrusions 41a are inserted is provided on the inner surfaces of the pair of first side walls 24. The pair of engaging protrusions 41a are inserted into the pair of engaging recesses 24a, thereby fixing the flow path forming member 14 to the case 13. In this case, it is not necessary to provide the second case member 22 with a structure for fixing the flow path forming member 14 to the case 13, and therefore molding the second case member 22 becomes easier.

[0043] (3) For example, when the flow path forming member 14 is not disposed in the space surrounded by the first holding portion 31, the second case member 22, and the connection portion 33a, the first flow path R1 is partitioned by the first holding portion 31 and the second case member 22. In this case, the flow path cross-sectional area of ​​the first flow path R1 becomes larger than the flow path cross-sectional area of ​​the second flow path R2, and the flow rate of the cooling fluid in the first flow path R1 decreases, which may result in a decrease in cooling efficiency.

[0044] In contrast, in this embodiment, the flow path forming member 14 is disposed in a space surrounded by the first holding portion 31, the second case member 22, and the connection portion 33a. The first flow path R1 is partitioned by the first holding portion 31 and the flow path forming member 14. Therefore, the flow path cross-sectional area of ​​the first flow path R1 can be made approximately equal to the flow path cross-sectional area of ​​the second flow path R2. Therefore, it is possible to prevent a decrease in the flow rate of the cooling fluid in the first flow path R1, thereby improving the cooling efficiency.

[0045] (4) For example, it is possible to form a linear cooling flow path R by forming the holding wall 23 in a flat plate shape. In this case, the second heat generating component 12 is held on the same surface of the holding wall 23 as the surface on which the first heat generating component 11 is held. As described above, the height of the second heat generating component 12 is greater than the height of the first heat generating component 11. Therefore, the amount of protrusion of the second heat generating component 12 from the holding wall 23 is greater than the amount of protrusion of the first heat generating component 11 from the holding wall 23. Then, the distance from the circuit board 15 covering the second heat generating component 12 to the first heat generating component 11 becomes greater, and the length of the lead wire connecting the circuit board 15 and the first heat generating component 11 also becomes longer, resulting in greater copper loss.

[0046] In contrast, in this embodiment, the second heat generating component 12 is held by the bottom wall portion 32 located closer to the second case member 22 than the first holding portion 31, and therefore it is possible to prevent the second heat generating component 12 from significantly protruding from the holding wall 23 beyond the first heat generating component 11. This makes it possible to reduce the distance from the circuit board 15 to the first heat generating component 11, and therefore the length of the lead wire connecting the circuit board 15 and the first heat generating component 11 can be shortened. As a result, it is possible to reduce copper loss.

[0047] (5) In this embodiment, a gap is provided between the peripheral wall portion 33 and each first side wall 24. Therefore, the second heat-generating component 12 is also cooled by the cooling fluid flowing between the peripheral wall portion 33 and each first side wall 24. In addition, a gap is provided between the peripheral wall portion 33 and the second side wall 25. Therefore, the second heat-generating component 12 is also cooled by the cooling fluid flowing between the peripheral wall portion 33 and the second side wall 25. Therefore, the cooling efficiency of the second heat-generating component 12 can be improved.

[0048] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0049] In the above embodiment, the flow path forming member 14 is provided with the engaging protrusion 41a and the case 13 is provided with the engaging recess 24a, but the flow path forming member 14 may be provided with the engaging recess 24a and the case 13 may be provided with the engaging protrusion 41a. Specifically, the first case member 21 has a pair of engaging protrusions that protrude from the inner surfaces of the pair of first side walls 24 toward the flow path forming member 14. The flow path forming member 14 has a pair of engaging recesses that are recessed from the pair of fourth surfaces 14d and into which the pair of engaging protrusions are inserted. In this case, the same effect as effect (2) of the above embodiment can be obtained.

[0050] In short, as long as one of the flow path forming member 14 and the pair of first side walls 24 has a pair of engaging protrusions protruding toward the other, and the other has a pair of engaging recesses into which the pair of engaging protrusions are inserted, an effect similar to effect (2) of the above embodiment can be obtained.

[0051] In the above embodiment, the flow path forming member 14 was fixed to the case 13 by inserting the engagement protrusion 41a of the flow path forming member 14 into the engagement recess 24a of the case 13, but the method of fixing the flow path forming member 14 to the case 13 is not limited to this.

[0052] For example, as shown in Fig. 5 and Fig. 6, the flow path forming member 14 may be fixed to the first case member 21 by being press-fitted between a pair of first side walls 24. In the example shown in Fig. 5 and Fig. 6, a pair of press-fit grooves 24b into which the flow path forming member 14 is press-fitted is provided on the inner surface of the pair of first side walls 24. The press-fit groove 24b is provided between two connection parts 33a in the longitudinal direction of the holding wall 23. Each press-fit groove 24b opens at the tip end surface of the pair of first side walls 24. Each press-fit groove 24b has a step surface 240 that connects the inner surface of the first side wall 24 and the inner bottom surface of the press-fit groove 24b.

[0053] In the above configuration, the flow path forming member 14 is fixed to the case 13 by being pressed into the press-fit grooves 24b provided in the pair of first side walls 24. In this case, it is not necessary to provide the second case member 22 with a configuration for fixing the flow path forming member 14 to the case 13, so that the molding of the second case member 22 becomes easier. In addition, by pressing the flow path forming member 14 until the first surface 14a of the flow path forming member 14 abuts against the step surface 240, the flow path forming member 14 can be pressed into a position where the first surface 14a does not contact the first holding portion 31 and the second surface 14b is flush with the tip surfaces of the pair of first side walls 24. Furthermore, the flow path forming member 14 can be suppressed from moving in the longitudinal direction of the holding wall 23.

[0054] The press-fit grooves 24b may not be provided on the inner surfaces of the pair of first side walls 24. The flow path forming member 14 may be press-fitted between the pair of first side walls 24 such that the pair of fourth surfaces 14d abut on the inner surfaces of the pair of first side walls 24.

[0055] For example, as shown in Fig. 7 and Fig. 8, the flow path forming member 14 may be fixed to the first case member 21 by a bolt B as a fastening member. Specifically, the first holding portion 31 has a boss 34 protruding from a surface opposite to the surface holding the first heat generating component 11. A female screw hole 34a is formed in the tip surface of the boss 34. The flow path forming member 14 has a recess 42 recessed from the second surface 14b. A bolt insertion hole 42a is formed in the bottom of the recess 42. The bolt B is inserted from inside the recess 42 into the bolt insertion hole 42a and then screwed into the female screw hole 34a.

[0056] In the above configuration, the flow path forming member 14 is fixed to the first holding portion 31 by the bolt B, and thereby the flow path forming member 14 is fixed to the case 13. In this case, it is not necessary to provide the second case member 22 with a structure for fixing the flow path forming member 14 to the case 13, and therefore the molding of the second case member 22 becomes easier.

[0057] However, the cooling fluid does not flow through the portion between the first holding portion 31 and the flow path forming member 14 where the bolt B is located. For this reason, for example, when the bolt B is fixed to a portion of the first holding portion 31 that overlaps with the first heat generating component 11, the first heat generating component 11 that overlaps with the bolt B is difficult to cool. In contrast, in the example shown in Fig. 8, the bolt B is fixed to a portion of the first holding portion 31 that is located between the first heat generating components 11. Therefore, the first heat generating component 11 is easily cooled.

[0058] The fastening member is not limited to the bolt B as long as it can fix the flow passage forming member 14 to the case 13. The fastening member may be, for example, a press-fit pin. A boss may be provided on the flow path forming member 14 instead of the first holding portion 31. The boss extends cylindrically from the first surface 14a of the flow path forming member 14. The female screw hole 34a is formed on the surface of the first holding portion 31 opposite to the surface that holds the first heat generating component 11.

[0059] As shown in Fig. 9, the flow path forming member 14 may be fixed to the second case member 22. In Fig. 9, a press-fit recess 22a into which the flow path forming member 14 is press-fitted is formed on the inner surface of the second case member 22. The flow path forming member 14 is fixed to the second case member 22 by being press-fitted into the press-fit recess 22a.

[0060] The method of fixing the flow passage forming member 14 to the second case member 22 is not limited to press-fitting, and may be changed as appropriate. For example, the flow passage forming member 14 may be fixed to the second case member 22 by a fastening member such as a bolt.

[0061] The size of the second case member 22 does not have to be the same as the size of the first case member 21. The second case member 22 may be larger than the first case member 21 so that one second case member 22 can close not only the opening of the first case member 21 but also the openings of the other case members.

[0062] The configuration of the case 13 may be modified as appropriate. For example, the retaining wall 23, the pair of first side walls 24, and the pair of second side walls 25 may be separate bodies.

[0063] For example, the number of the accommodating recess 30 provided in the retaining wall 23 may be one. In this case, the second flow path R2 and the connection flow path R3 are provided on one side of the first flow path R1. In the above embodiment, a gap is provided between the peripheral wall portion 33 and each first side wall 24, but this gap does not have to be provided. In this case, the flow rate of the cooling fluid flowing through the second flow passage R2 increases by the amount of cooling fluid not flowing between the peripheral wall portion 33 and each first side wall 24, and the flow rate of the cooling fluid in the second flow passage R2 increases, thereby improving the cooling efficiency.

[0064] In the above embodiment, a gap is provided between the peripheral wall portion 33 and the second side wall 25. However, this gap does not have to be provided. The material of the flow passage forming member 14 is not limited to resin and may be, for example, metal.

[0065] The cooling fluid is not limited to LLC, and may be other liquids such as cooling water or gases such as air. The first heat generating component 11 is not limited to a MOSFET.

[0066] The second heat generating component 12 is not limited to a transformer or a coil. The number of first heat generating components 11 and the number of second heat generating components 12 included in the electronic device 10 may be changed as appropriate.

[0067] The electronic device 10 is not limited to a power converter. [Explanation of symbols]

[0068] 10...electronic device, 11...first heat-generating component, 12...second heat-generating component, 13...case, 14...flow path forming member, 21...first case member, 22...second case member, 23...retaining wall, 24...first side wall as side wall, 24a...engagement recess, 31...first retaining portion, 32...bottom wall portion as second retaining portion, 33a...connection portion, 41a...engagement protrusion, B...bolt as fastening member, R...cooling flow path, R1...first flow path, R2...second flow path, R3...connecting flow path.

Claims

1. a first case member having a retaining wall for retaining a first heat generating component and a second heat generating component, and a flat plate-shaped second case member disposed on the opposite side of the retaining wall from the first heat generating component and the second heat generating component, and a cooling flow path through which a cooling fluid for cooling the first heat generating component and the second heat generating component flows is provided between the retaining wall and the second case member, the retaining wall has a stepped shape including a first retaining portion that retains the first heat generating component, a second retaining portion that is located closer to the second case member than the first retaining portion and that retains the second heat generating component, and a connecting portion that connects the first retaining portion and the second retaining portion, a flow path forming member that is separate from the first case member and the second case member is disposed in a space surrounded by the first holding portion, the second case member, and the connection portion; The cooling flow path includes: a first flow path defined by the first holding portion and the flow path forming member; a second flow path defined by the second holding portion and the second case member; a connection flow path that is partitioned by the connection portion and the flow path forming member and connects the first flow path and the second flow path; 1. An electronic device comprising:

2. the first case member has a pair of side walls extending from the retaining wall toward the second case member and positioned on both sides of the flow path forming member, 2. The electronic device according to claim 1, wherein one of the flow path forming member and the pair of side walls has a pair of engaging protrusions protruding toward the other, and the other has a pair of engaging recesses into which the pair of engaging protrusions are inserted.

3. the first case member has a pair of side walls extending from the retaining wall toward the second case member and positioned on both sides of the flow path forming member, The electronic device according to claim 1 , wherein the flow passage forming member is press-fitted between the pair of side walls.

4. The electronic device according to claim 1 , wherein the flow passage forming member is fixed to the first holding portion by a fastening member.

5. The first holding portion holds a plurality of the first heat generating components in a line, The electronic device according to claim 4 , wherein the fastening member is fixed to a portion of the first holding portion that is located between the first heat generating components.

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