JP7312093B2 - power converter - Google Patents

Description

The present invention relates to a power converter that transforms input power and outputs the same.

Some electric devices are configured as follows. That is, the electrical device has a casing and a base attached thereto. An electric circuit is mounted on the base, and a water passage for cooling the electric circuit is formed between the casing and the base. A cutoff portion is provided near the heating element of the electric circuit in the water passage to block the casing side and concentrate the flow of the cooling water on the base side.

Due to this cutoff portion, the flow of the cooling water is locally drawn toward the base side, that is, toward the heating elements, and the water passage is narrowed to locally speed up the flow of the cooling water. As a result, the cooling performance is locally improved in this portion. As a document showing such a technique, there is the following Patent Document 1.

JP 2003-188326 A

The inventors have noticed that the above technique has the following problems. That is, when the above technology is applied to a multi-port power conversion device having a large number of heat generating elements, the cutoff section must be provided for each of the large number of heat generating elements. . However, in that case, there is a risk that the pressure loss in the entire water channel will become too large due to the excessive number of blocking portions.

In addition, since the portion where high cooling performance can be ensured is limited to the vicinity of the cutoff portion, the degree of freedom of arrangement of each heating element decreases, and it may become difficult to reduce the size of the entire power converter.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a main object of the present invention is to ensure high cooling performance over a wide range in a power converter.

A power conversion device of the present invention includes a base having a first member and a second member, and a device circuit attached to the base, wherein a flow path is formed between the first member and the second member. It is The power conversion device transforms input electric power by the device circuit and outputs the converted power, and cools the device circuit with a refrigerant flowing through the flow path.

At least one ridge-shaped first fin is formed on a first opposing surface of the first member that faces the second member across the flow path. In addition, at least one ridge-shaped second fin extending parallel to the first fin is formed on a second opposing surface of the second member, which is a surface facing the first member across the flow path. ing. As described above, the flow path is divided into a plurality of divided flow paths by the fins of the first fin and the second fin, and the coolant flows along each of the divided flow paths.

According to the present invention, the channel is divided into a plurality of divided channels with each fin as a boundary, and the coolant flows along each divided channel. Therefore, if the flow path is not divided into a plurality of divided flow paths, the flow that concentrates in a part of the flow path due to the refrigerant trying to flow in a short path in a place with less pressure loss in the flow path is divided into divided flow paths. can be distributed in the side-by-side direction. As a result, high cooling performance can be ensured over a wide range in the power conversion device compared to the case where the flow path is not divided into a plurality of divided flow paths.

BRIEF DESCRIPTION OF THE DRAWINGS Front sectional drawing which shows the power converter device of 1st Embodiment Plan sectional view showing a section of the II-II line shown in FIG. Front sectional view enlarging a part of FIG. Side cross-sectional view showing a cross-section of the IV-IV line shown in FIG. Side cross-sectional view showing a cross-section of the VV line shown in FIG. Planar cross-sectional view showing the flow of coolant in a comparative example without fins Planar cross-sectional view showing the flow of the coolant in this embodiment with fins

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments, and can be modified as appropriate without departing from the gist of the invention.

[First embodiment]
FIG. 1 is a front cross-sectional view showing a power conversion device 100 of this embodiment, and more specifically, a cross-sectional view taken along line II shown in FIG. A power conversion device 100 is mounted on a vehicle. The power conversion device 100 has a substrate 100a and a device circuit 100b. The base 100 a has a first member 60 and a second member 70 . The device circuit 100 b has first to fourth ports 10 , 20 , 30 and 40 , first to fourth conversion circuits 13 , 23 , 33 and 43 and a transformer 50 . A flow path 80 is formed between the first member 60 and the second member 70, and cooling water as a coolant for cooling the device circuit 100b flows through the flow path 80. As shown in FIG.

First, the base 100a will be described. The first member 60 has an intermediate wall portion 63 extending horizontally in the upper and lower intermediate portions. Using the intermediate wall portion 63 as a bottom, an upper concave portion 61 opening upward D5 is formed above the intermediate wall portion 63 in the first member 60 . With the intermediate wall portion 63 as a ceiling portion, a lower concave portion 69 opening downward D6 is formed below the intermediate wall portion 63 in the first member 60 . Furthermore, the lower surface of the intermediate wall portion 63, which is the ceiling surface of the lower recessed portion 69, is formed with a channel recessed portion 63b recessed upward. A second member 70 is attached to the lower end portion of the intermediate wall portion 63 so as to block the channel recess portion 63b. An upper lid (not shown) is attached to the upper end of the first member 60 , and a lower lid (not shown) is attached to the lower end of the first member 60 . The base 100a has a substantially rectangular parallelepiped shape with the upper and lower covers attached.

Next, the device circuit 100b will be described. Each of the first through fourth ports 10 , 20 , 30 , 40 is installed on the side of the first member 60 . External circuits are connected to the first to fourth ports 10, 20, 30 and 40, respectively.

The first conversion circuit 13 and the second conversion circuit 23 are attached to the upper surface of the intermediate wall portion 63 of the first member 60 , and the third conversion circuit 33 and the fourth conversion circuit 43 are attached to the lower surface of the second member 70 . and a transformer 50 are attached.

The first conversion circuit 13 is electrically connected to the first port 10 and a first coil (not shown) that is part of the transformer 50 . The first conversion circuit 13 converts between the current form (direct current or alternating current) of the external circuit connected to the first port 10 and alternating current of a predetermined frequency. Specifically, if the first port 10 is designed to be connected to a direct current external circuit, the first conversion circuit 13 is a circuit that converts between the direct current and alternating current of a predetermined frequency. If the specification is such that an AC external circuit is connected to the first port 10, the first conversion circuit 13 is a circuit that converts between the AC and AC of a predetermined frequency.

As a more specific aspect of the first conversion circuit 13, for example, there is a aspect in which conversion is performed bidirectionally between the current aspect of the external circuit and the alternating current of a predetermined frequency. However, for example, when power is exclusively input to the first port 10 from an external circuit, the first conversion circuit 13 is an input-only circuit that unidirectionally converts the current form of the external circuit to alternating current of a predetermined frequency. may be Further, for example, when power is exclusively output from the first port 10 to an external circuit, the first conversion circuit 13 is an output-only circuit that unidirectionally converts alternating current of a predetermined frequency into a current mode of the external circuit. There may be. The first conversion circuit 13 has a heating element such as a semiconductor switch.

The description of the second conversion circuit 23 is the same as the description of the first conversion circuit 13 above, except that "first" is replaced with "second" and the reference numerals are replaced with corresponding ones. The description of the third conversion circuit 33 is the same as the description of the first conversion circuit 13 above, except that "first" is replaced with "third" and the reference numerals are replaced with corresponding ones. The description of the fourth conversion circuit 43 is the same as the description of the first conversion circuit 13 above, except that "first" is replaced with "fourth" and the reference numerals are replaced with corresponding ones.

The transformer 50 has a transformer core and the first to fourth coils wound thereon. Then, when an alternating current of a predetermined frequency flows through any of the coils, the alternating current generates a magnetic flux in the transformer core, and a change in the magnetic flux generates an induced electromotive voltage in each coil. Thus, AC power is transmitted between the first to fourth coils by magnetic coupling. Accompanying the transmission, AC power is transformed according to the turns ratio of the coil, the degree of magnetic coupling, and the like.

As described above, the first conversion circuit 13, the second conversion circuit 23, and the like are attached to the first member 60, and the third conversion circuit 33, the fourth conversion circuit 43, the transformer 50, and the like are attached to the second member 70. etc. is installed. Then, the unit of all the circuits (33, 43, 50) attached to the second member 70 is higher than the maximum total amount of heat generated per unit time by all the circuits (13, 23) attached to the first member 60 The maximum total calorific value per hour is larger.

Next, the flow path 80 and its periphery will be described. By closing the passage recess 63 b of the intermediate wall portion 63 with the second member 70 , the passage is a space surrounded by the ceiling surface and the inner side surface of the passage recess 63 b and the upper surface of the second member 70 . 80 is formed. A sealing member (not shown) or the like is interposed between the peripheral portion of the passage concave portion 63b on the lower surface of the intermediate wall portion 63 and the upper surface of the second member 70, so that the cooling water in the passage 80 is It is designed not to leak to the outside.

A portion of the intermediate wall portion 63 above the passage recess 63b forms a thick portion 63a having a thickness T in the vertical directions D5 and D6. A ceiling surface of the channel recess 63b, which is the lower surface of the thick portion 63a, constitutes a first opposing surface 67. As shown in FIG. The first opposing surface 67 is a surface of the first member 60 that faces the second member 70 with the flow path 80 interposed therebetween. A top surface of the second member 70 constitutes a second opposing surface 76 . The second facing surface 76 is a surface of the second member 70 that faces the first member 60 across the flow path 80 .

A plurality of ridge-shaped first fins 68 are formed on the first facing surface 67 , and a plurality of ridge-shaped second fins 78 extending parallel to the first fins 68 are formed on the second facing surface 76 . It is Specifically, the first fins 68 and the second fins 78 are alternately arranged in the direction in which they are arranged. Thereby, the second fins 78 are arranged between the first fins 68 and the first fins 68 are arranged between the second fins 78 .

More specifically, the second facing surface 76 and the second fins 78 are provided with a protrusion 75 protruding into the flow path 80 at a portion of the second facing surface 76 that overlaps the transformer 50 in plan view seen downward D6. It is A second fin 78 is formed on a portion of the second opposing surface 76 that includes the convex portion 75 .

FIG. 2 is a cross-sectional view taken along line II--II shown in FIG. Hereinafter, one horizontal direction and its opposite direction will be referred to as "rear D1" and "forward D3", and one horizontal direction orthogonal to them and its opposite direction will be referred to as "right D2" and "left D4". ”. However, it is optional to design by reversing the left and right, or to set the front and back to the left and right, and the like.

The flow path 80 is a space that extends horizontally. A rib-shaped partition portion 66 is formed in the left-right intermediate portion of the first opposing surface 67 of the first member 60, extending from the front wall portion of the flow path 80 to the rear D1 and reaching the intermediate portion in the front-rear direction of the flow path 80. It is An inflow recess 83 recessed upward D5 is provided on the ceiling surface of the front portion of the flow path 80 on the left side D4 of the partition portion 66, that is, on the first opposing surface 67. As shown in FIG. An inflow pipe 81 communicating with the inflow recess 83 from the front surface of the first member 60 is installed in front D3 of the inflow recess 83 . In addition, the ceiling surface of the front portion of the flow path 80 on the right side D2 of the partition portion 66, that is, the first facing surface 67, is provided with an outflow recess portion 87 that is recessed upward D5. An outflow pipe 89 that communicates with the outflow recess 87 from the front surface of the first member 60 is installed in front D3 of the outflow recess 87 . The details of the inflow recess 83, the inflow pipe 81, the outflow recess 87, and the outflow pipe 89 will be described later.

In the flow path 80, each of the fins 68 and 78 first extends from the front D3 of the rear end of the partition 66 to the rear D1 of the rear end of the partition 66 at D4 to the left of the partition 66. ing. From there, each fin 68 , 78 extends rearward D 1 from the rear end of the partition 66 from D 4 to the left of the partition 66 to D 2 to the right of the partition 66 . Next, from there, each fin 68, 78 extends from the rear end D1 of the rear end of the partition portion 66 to the front D3 of the rear end of the partition portion 66 on the right side D2 of the partition portion 66. . The flow path 80 is divided into a plurality of divided flow paths 84 with the fins 68 and 78 as boundaries.

Cooling water flows along the divided flow path 84 . Therefore, in the flow path 80, the cooling water first flows to the rear side D1, then to the right side D2, and then to the front side D3. Hereinafter, in the flow path 80, a region in which the cooling water flows toward the rear D1 side will be referred to as a “first region R1,” and a region in which the cooling water flows toward the right side D2 will be referred to as a “second region R2.” flows to the front D3 side is referred to as a "third region R3".

Each fin 68, 78 extends continuously from the first region R1 to the third region R3 through the second region R2. The width w of each divided channel 84 is equal at least at a plurality of predetermined portions.

The total surface area of all the second fins 78 is larger than the total surface area of all the first fins 68 . Such a configuration can be realized, for example, by making the second fins 78 longer than the first fins 68 or by increasing the number of the second fins 78 than the first fins 68, as shown in FIG. . In addition to this, for example, it can be realized by making the projection length of the second fin 78 longer than that of the first fin 68, or the like.

FIG. 3(a) is an enlarged view of a part of FIG. The projection length L of each fin 68, 78 is the distance between the first opposing surface 67 and the second opposing surface 76 when the fins 68, 78 are omitted at the position where the fins 68, 78 are located in the flow path 80. Within the range not exceeding G, it is preferably as large as possible. This is because the flow of the cooling water from the divided flow path 84 to the adjacent divided flow path 84 can be further suppressed. However, if by some chance the protruding length L of the fins 68, 78 exceeds the above-described gap G due to a deviation in dimensional accuracy, the fins 68, 78 interfere with each other, causing the first member 60 and the second member 70 to move. A gap may be formed in the seal of the flow path 80 . Therefore, it is preferable to maximize the protrusion length L of the fins 68, 78 within a range in which the protrusion length L of the fins 68, 78 does not exceed the gap G even if the dimensional accuracy is deviated. Therefore, in this embodiment, the protruding length L of each fin 68, 78 is 80% or more of the gap G and less than the gap G. As shown in FIG.

Instead of or in addition to maximizing the protruding length L of the fins 68 and 78, as shown in FIG. , and between the second fin 78 and the first opposing surface 67, an elastic member E such as a rubber material may be interposed.

FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. An inflow concave portion 83 is formed at the front end portion of the left side portion of the first opposing surface 67, the concave portion 83 being concave upward D5 and having the lower end opening to the flow path 80. As shown in FIG. An inflow hole 82 extending from the front surface of the first member 60 to the rear D1 and communicating with the inflow recess 83 is formed in the front D3 of the inflow recess 83 . An inflow pipe 81 is press-fitted into the inflow hole 82 . The inside of the inflow pipe 81 constitutes an inflow passage 81a for allowing cooling water to flow into the flow path 80 from the outside of the base 100a. The inflow passage 81a is positioned D5 above the upper ends of the fins 68 and 78, that is, D5 above the base of the first fin 68. As shown in FIG.

FIG. 5 is a cross-sectional view taken along line VV shown in FIG. 2, that is, a cross-sectional view of the right side portion of the power conversion device 100. As shown in FIG. An outflow concave portion 87 is formed in the front end portion of the right-side portion of the first opposing surface 67 so as to be concave upward D5 and open to the flow path 80 at the lower end thereof. An outflow hole 88 extending rearward D1 from the front surface of the first member 60 and communicating with the outflow recess 87 is formed in the front D3 of the outflow recess 87 . An outflow pipe 89 is press-fitted into the outflow hole 88 . The inside of the outflow pipe 89 constitutes an outflow passage 89a for causing the cooling water in the flow path 80 to flow out of the base 100a. The outflow passage 89a is positioned D5 above the upper ends of the fins 68 and 78, that is, D5 above the base of the first fin 68. As shown in FIG.

According to this embodiment, the following effects are obtained. The flow path 80 is divided into a plurality of divided flow paths 84 with the fins 68 and 78 as boundaries, and the cooling water flows along each divided flow path 84 . Therefore, if the flow path 80 is not divided into a plurality of divided flow paths 84 as shown in FIG. As shown in FIG. 7, the flow concentrated in one part can be dispersed in the direction in which the divided flow paths 84 are arranged side by side. As a result, high cooling performance can be ensured in a wide range within the power conversion device 100 compared to the case where the flow path 80 is not divided into a plurality of divided flow paths 84 . Moreover, the flow of the cooling water is dispersed in the direction in which the divided flow paths 84 are arranged side by side, and the flow paths 80 are effectively used in the direction in which the divided flow paths 84 are arranged side by side, which leads to a decrease in pressure loss.

By alternately arranging the first fins 68 and the second fins 78 in the direction in which they are arranged side by side, the second fins 78 are arranged between the first fins 68, and the second fins 78 are arranged between the second fins 78. A first fin 68 is arranged in the . Therefore, compared to the case where only one of the first member 60 and the second member 70 is provided with fins to form the divided flow passage 84 of the same width, the fins 68 and 78 provided on the one member are Larger intervals can be set. Therefore, the manufacturing difficulty of the one member can be lowered.

In addition, the unit of all the circuits (33, 43, 50) attached to the second member 70 is higher than the maximum total heat generation amount per unit time of all the circuits (13, 23) attached to the first member 60 The maximum total calorific value per hour is larger. The total surface area of all the second fins 78 is larger than the total surface area of all the first fins 68 . Therefore, the second member 70 having a large maximum total heat value can be cooled more intensively, thereby cooling the entire device circuit 100b in a well-balanced manner.

The projection length L of each fin 68, 78 is the distance between the first opposing surface 67 and the second opposing surface 76 at the position where the fins 68, 78 are present in the flow path 80 when the fins 68, 78 are omitted. Since it is 80% or more of the interval G, each divided channel 84 can be sufficiently separated from the adjacent divided channel 84 . Further, since the protruding length L of each fin 68, 78 is equal to or less than the distance G, the sealing of the flow path 80 by the first member 60 and the second member 70 is prevented by interference between the fins 68, 78. It's not like you can't do it either.

Further, if the elastic member E is interposed between the first fin 68 and the second opposing surface 76 and between the second fin 78 and the first opposing surface 67, each divided flow channel 84 can be divided into It can be more strongly separated from the adjacent split channel 84 . Further, in this case, since the elastic member E is interposed, even if the thickness of the elastic member E is slightly larger than the gap between the fins 68, 78 and the opposing surfaces 76, 67, the elastic member E is elastically deformed to absorb the can. Therefore, the required dimensional accuracy can be suppressed. In this case, the first fin 68 contacts the second opposing surface 76 via the elastic member E, and the second fin 78 contacts the first opposing surface 67 via the elastic member E. Heat is more likely to be conducted from the higher temperature side to the lower side of the member 60 and the second member 70, and the power conversion device 100 as a whole can be cooled in a well-balanced manner.

Further, each of the fins 68 and 78 passes through a first region R1 through which the cooling water flows toward the rear D1 side, a second region R2 through which the cooling water flows toward the right side D2, and a third region through which the cooling water flows forward toward the D3 side. It extends continuously without interruption until it reaches the region R3. Therefore, each of the fins 68 and 78 can efficiently guide the cooling water from the first region R1 to the third region R3 in the substantially U-shaped channel 80 as described above. In addition, by forming the substantially U-shaped channel 80, the inflow pipe 81 and the outflow pipe 89 can be installed on the same surface (front surface) of the substrate 100a. Easier to install pipes.

In addition, the following effects are also obtained. If an inflow hole 82 communicating from the outside of the substrate 100a to the flow path 80 is formed right beside the flow path 80, and the inflow pipe 81 is press-fitted into the inflow hole 82, the press-fitting pressure will A portion forming the inner wall of the flow path 80 may be deformed. In this regard, here, the thick portion 63a is formed with an inflow recess 83 that is recessed upward D5 in the thickness direction, and a front D3 of the inflow recess 83 is formed from the outer surface of the first member 60. An inflow hole 82 extending rearward D<b>1 , which is a direction perpendicular to the thickness direction, and communicating with the inflow recess 83 is formed. An inflow pipe 81 is press-fitted into the inflow hole 82 . Therefore, the press-fitting pressure is applied to the thick portion 63a in the rear direction D1, which is the direction orthogonal to the thickness direction, and a structure that can easily withstand the press-fitting pressure can be realized. Further, since the outflow side is also configured in the same manner, the same effect can be obtained.

Further, since the outflow passages 89a are formed above the upper ends of the fins 68 and 78, even if bubbles enter the divided flow passage 84, the bubbles are easily discharged from the outflow passages 89a. Therefore, it is possible to suppress accumulation of air bubbles in the divided flow path 84 and maintain high cooling performance by the cooling water flowing through the divided flow path 84 .

In addition, the following effects are also obtained. Since the transformer 50 has a complicated structure, it is often difficult for heat to be transmitted to the outside. Specifically, for example, for a magnetic member consisting of a transformer core and first to fourth coils, the transformer core, which is usually made of ferrite with low thermal conductivity, is in contact with the transformer cover, so cooling is not possible. hard to do Therefore, the transformer 50 is preferably cooled mainly. In this respect, here, a convex portion 75 projecting into the flow path 80 is provided at a portion of the second opposing surface 76 that overlaps the transformer 50 in plan view seen downward D6. Since the gap between the first opposing surface 67 and the second opposing surface 76 is narrowed at the location where the convex portion 75 is provided, the cooling water flows faster. Therefore, the cooling performance is improved. Therefore, the transformer 50 can be cooled intensively.

Moreover, since the width w of each divided flow path 84 is equal at least at a predetermined portion, the flow of the cooling water can be easily divided evenly in the direction in which the divided flow paths 84 are arranged.

[Other embodiments]
The above embodiment can be implemented with the following modifications. For example, the power conversion device 100 may be mounted on a vehicle or fixed object other than a vehicle. Also, for example, although there are two first fins 68 in the drawing, the number may be one or three or more. Also, in the drawing, the number of the second fins 78 is three, but the number may be one, two, or four or more.

Further, for example, the first fins 68 and the second fins 78 are preferably arranged alternately in the parallel direction in order to reduce the difficulty of manufacturing as described above. may be performed in a non-alternating manner. Further, for example, the channel 80 may be linear instead of substantially U-shaped.

Further, for example, instead of flowing cooling water as a coolant in the flow path 80, other liquids or gases such as air may be flowed. Further, for example, even if the power conversion device 100 is installed with the “top” in the embodiment set to the “bottom”, the power conversion device 100 may be installed with the “top” and “bottom” in the embodiment set in the horizontal direction. may

Further, for example, the fins 68 and 78 extend linearly to the rear D1, then to the right D2, and then to the front D3 in FIG. It may be arranged such that it extends in a curved shape while bending, then extends in a curved shape while bending to the right side D2, and then extends in a curved shape while bending in the front D3 side.

Further, for example, contrary to the embodiment, the maximum total amount of heat generated per unit time by all the circuits attached to the first member 60 is higher than the total amount of heat generated per unit time by all the circuits attached to the second member 70. It may be designed to be larger than the maximum total calorific value. In that case, it is preferable to design so that the total surface area of all the first fins 68 is larger than the total surface area of all the second fins 78, contrary to the embodiment.

Further, for example, instead of providing the convex portion 75 for accelerating the flow of cooling water on the second member 70 side to which the transformer 50 is attached, that is, on the second opposing surface 76, the first member 70 on which the transformer 50 is not attached may be provided. The protrusion 75 may be provided on the member 60 side, that is, on the first opposing surface 67 .

Further, for example, instead of press-fitting the inflow pipe 81 into the inflow hole 82, the inflow pipe 81 may be fixed to the inflow hole 82 by fastening or welding. Similarly, instead of press-fitting the outflow pipe 89 into the outflow hole 88, the outflow pipe 89 may be fixed to the outflow hole 88 by fastening or welding.

50... transformer, 60... first member, 67... first opposing surface, 68... first fin, 70... second member, 76... second opposing surface, 78... second fin, 80... flow path, 84... division Flow path 100 Power conversion device 100a Substrate 100b Device circuit.

Claims (12)

a substrate (100a) having a first member (60) and a second member (70); device circuitry (100b) attached to said substrate; A channel (80) is formed,
In a power conversion device (100) in which the input power is transformed by the device circuit and output, and the device circuit is cooled by the refrigerant flowing through the flow path,
At least one ridge-shaped first fin (68) is formed on a first opposing surface (67) of the first member that faces the second member across the flow path. At least one ridge-shaped second fin (78) extending parallel to the first fin is formed on a second facing surface (76) of the member that faces the first member across the flow path. As a result, the flow path is divided into a plurality of divided flow paths (84) with each fin of the first fin and the second fin as a boundary, and the coolant flows along each of the divided flow paths. flow,
The first member has a thick portion (63a) having a thickness (T) in predetermined thickness directions (D5, D6), and one surface (D6) of the thick portion in the thickness direction. is the first facing surface,
An inflow recessed portion (83) is formed in the first opposing surface to be recessed in the thickness direction and open to the flow path. An inflow hole (82) extending to communicate with the inflow recess is formed, and an inflow pipe (81) is inserted and fixed in the inflow hole.
Power converter. The first member has a thick portion (63a) having a thickness (T) in predetermined thickness directions (D5, D6), and one surface (D6) of the thick portion in the thickness direction. is the first facing surface,
An outflow recessed portion (87) is formed in the first opposing surface to be recessed in the thickness direction and open to the flow path, and a direction (D1) perpendicular to the thickness direction from the outer surface of the first member is formed. 2. The power converter according to claim 1 , wherein an outflow hole (88) extending to communicate with said outflow recess is formed, and an outflow pipe (89) is inserted and fixed in said outflow hole. a substrate (100a) having a first member (60) and a second member (70); device circuitry (100b) attached to said substrate; A channel (80) is formed,
In a power conversion device (100) in which the input power is transformed by the device circuit and output, and the device circuit is cooled by the refrigerant flowing through the flow path,
At least one ridge-shaped first fin (68) is formed on a first opposing surface (67) of the first member that faces the second member across the flow path. At least one ridge-shaped second fin (78) extending parallel to the first fin is formed on a second facing surface (76) of the member that faces the first member across the flow path. As a result, the flow path is divided into a plurality of divided flow paths (84) with each fin of the first fin and the second fin as a boundary, and the coolant flows along each of the divided flow paths. flow,
The first member has a thick portion (63a) having a thickness (T) in predetermined thickness directions (D5, D6), and one surface (D6) of the thick portion in the thickness direction. is the first facing surface,
An outflow recessed portion (87) is formed in the first opposing surface to be recessed in the thickness direction and open to the flow path, and a direction (D1) perpendicular to the thickness direction from the outer surface of the first member is formed. An outflow hole (88) extending to communicate with the outflow recess is formed, and an outflow pipe (89) is inserted and fixed in the outflow hole.
Power converter. One of the first member and the second member is a predetermined member, and the one of the first opposing surface and the second opposing surface formed on the predetermined member is the predetermined opposing surface, and the predetermined member is A transformer (50) for performing the transformation through magnetic coupling is attached to the back surface of the predetermined facing surface,
A projection protruding into the flow path at a portion overlapping the transformer on the predetermined opposing surface in a plan view viewed in the normal direction, with the direction orthogonal to the predetermined opposing surface being defined as a normal direction (D5, D6). A portion (75) is provided,
One of the first fin and the second fin formed on the predetermined member is defined as a predetermined fin (78), and the predetermined fin is formed on a portion of the predetermined facing surface including the convex portion,
The power converter according to any one of claims 1 to 3 . a substrate (100a) having a first member (60) and a second member (70); device circuitry (100b) attached to said substrate; A channel (80) is formed,
In a power conversion device (100) in which the input power is transformed by the device circuit and output, and the device circuit is cooled by the refrigerant flowing through the flow path,
At least one ridge-shaped first fin (68) is formed on a first opposing surface (67) of the first member that faces the second member across the flow path. At least one ridge-shaped second fin (78) extending parallel to the first fin is formed on a second facing surface (76) of the member that faces the first member across the flow path. As a result, the flow path is divided into a plurality of divided flow paths (84) with each fin of the first fin and the second fin as a boundary, and the coolant flows along each of the divided flow paths. flow,
One of the first member and the second member is a predetermined member, and the one of the first opposing surface and the second opposing surface formed on the predetermined member is the predetermined opposing surface, and the predetermined member is A transformer (50) for performing the transformation through magnetic coupling is attached to the back surface of the predetermined facing surface,
A projection protruding into the flow path at a portion overlapping the transformer on the predetermined opposing surface in a plan view viewed in the normal direction, with the direction orthogonal to the predetermined opposing surface being defined as a normal direction (D5, D6). A portion (75) is provided,
One of the first fin and the second fin formed on the predetermined member is defined as a predetermined fin (78), and the predetermined fin is formed on a portion of the predetermined facing surface including the convex portion,
Power converter. a plurality of each of the first fins and the second fins,
By alternately arranging the first fins and the second fins in the direction in which they are arranged, the second fins are arranged between the first fins, and the second fins are arranged between the second fins. The power conversion device according to any one of claims 1 to 5 , wherein a first fin is arranged. Of the first member and the second member, the one with the larger maximum total heat generation amount per unit time by all the circuits attached thereto is set as a large heat generation member, and the smaller one is set as a small heat generation member,
The sum of the surface areas of all the first fins and the second fins formed on the large heat-generating member is the sum of the surface areas of all the first fins and the second fins formed on the small heat-generating member. The power conversion device according to any one of claims 1 to 6 , which is larger than the total surface area of each of said fins of two fins . The protruding length (L) of each fin of the first fin and the second fin is the first opposing surface and the second opposing surface at the position where the fin is located in the flow path when the fin is omitted. The power converter according to any one of claims 1 to 7 , wherein the distance (G) to the surface is 80% or more and less than the distance. An elastic member (E) is interposed between the first fin and the second opposing surface and between the second fin and the first opposing surface. 1. The power conversion device according to item 1. In the flow path, the coolant flows in a predetermined first direction (D1), then flows in a second direction (D2) that is orthogonal to the first direction, and then flows in the first direction. flows in the third direction (D3), which is the opposite direction of
A first region (R1) is defined as a region in the channel in which the coolant flows in the first direction, and a second region (R2) is defined as a region in which the coolant flows in the second direction, A third region (R3) is defined as a region in which the coolant flows in the third direction in the flow path,
The fins of the first fin and the second fin extend continuously from the first region through the second region to the third region without interruption. 1. The power converter according to claim 1. An outflow passage (89a) is formed above the upper end of each fin of the first fin and the second fin. The power converter according to any one of claims 1 to 10 , which flows out to the outside. The power converter according to any one of claims 1 to 11 , wherein widths (w) of each of said divided flow paths are equal at least at predetermined portions.

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