JP5655575B2 - Cooler and power conversion device using the same - Google Patents

Description

  The present invention relates to a cooler for cooling a heating element provided in a power converter, and a power converter using the cooler.

  In recent years, electric vehicles such as hybrid vehicles and electric vehicles equipped with an electric motor as a drive source have become widespread. In addition to the electric motor, such an electric vehicle is equipped with a chargeable / dischargeable battery, a power conversion device that converts the DC power of the battery into three-phase AC power for driving the motor, and the like. The power conversion device performs power conversion by a switching operation of a semiconductor element such as an IGBT (insulated gate bipolar transistor), and the semiconductor element generates heat by the switching operation.

  For this reason, the power converter is provided with a cooler in order to remove this heat and prevent overheating of the semiconductor element (heating element). And while power converters are required to have higher output, demands for miniaturization and weight reduction have become stricter. For this reason, the cooler is required to be reduced in size and weight while ensuring high cooling performance.

  Therefore, a power conversion device including a cooler integrated with a housing of the power conversion device has been put into practical use. In such a power converter, in order to obtain high (good) cooling performance, for example, an inflow side that extends in the parallel direction of the inter-fin passages and communicates with one end side of the inter-fin passages. A refrigerant reservoir is provided, and the inter-fin passage and the inflow-side refrigerant reservoir are connected in communication by a throttle portion extending at least over the juxtaposed region of the inter-fin passage, and the throttle portion is larger than the inflow-side refrigerant reservoir. There is one designed to have distribution resistance (Patent Document 1).

  With such a configuration, when the refrigerant flows into the inflow side refrigerant reservoir, the refrigerant is evenly distributed over substantially the entire extending direction of the inflow side refrigerant reservoir, and the refrigerant flows toward the inter-fin passage in the entire region of the throttle portion. As a result, the refrigerant can flow into the inter-fin passages substantially uniformly. As a result, the circulation state of the refrigerant in each inter-fin passage is substantially uniform, and the heating element can be efficiently cooled.

JP 2008-172024 A

However, in the above-described power conversion device, the pressure loss of the refrigerant increases as the distance from the refrigerant inlet of the inflow side refrigerant reservoir increases due to the piping resistance in the inflow side refrigerant reservoir. As the distance from the refrigerant inlet of the reservoir increases, the amount of refrigerant flowing in decreases. Therefore, there is a possibility that the flow rate of the refrigerant in each fin passage cannot be made uniform.
Further, since the throttle portion is provided in the communication portion between the inter-fin passage and the refrigerant reservoir, the pressure loss of the refrigerant is increased, the refrigerant circulation amount is reduced, and the cooling performance may be deteriorated.

  Therefore, the present invention has been made to solve the above-described problems, and by controlling the flow rate of the refrigerant for each part for cooling the heating element, a cooler that can cool the heating element efficiently, And it aims at providing the power converter device using the same.

  One aspect of the present invention made to solve the above problems is that in the cooler integrated in the casing of the power converter, an opening is sealed by a refrigerant flow path for flowing the refrigerant and a heating element, A concave portion for exchanging heat between the heating element and the refrigerant, and a connecting portion for connecting the concave portion and the refrigerant passage, and an opening area and a shape of the connecting portion from an inlet of the refrigerant passage. It is characterized by a change corresponding to the distance.

  In this cooler, the refrigerant is supplied from the refrigerant flow path (inflow side) to the recess through the connection portion (inflow side). And heat exchange is performed between a heat generating body and a refrigerant | coolant in a recessed part. After the heat exchange, the refrigerant is discharged from the recess to another connecting portion (outflow side) to another refrigerant channel (outflow side), cooled, and then supplied again to the refrigerant channel (inflow side). Circulate. Here, since the opening area and the shape of the connecting portion change corresponding to the distance from the inlet of the refrigerant passage (inflow side), the flow rate of the refrigerant can be arbitrarily varied for each part in the recess. Thereby, for example, regardless of the distance from the inlet of the refrigerant passage (inflow side), the flow rate of the refrigerant can be made uniform throughout the recess, and the heating element can be efficiently cooled.

  And when the recessed part is provided with two or more, the flow rate of a refrigerant | coolant can be arbitrarily changed in each recessed part. Thereby, a refrigerant | coolant can be supplied with the optimal flow velocity for every recessed part irrespective of the distance from the inlet_port | entrance of a refrigerant path (inflow side). Moreover, in each recessed part, as above-mentioned, the flow volume of a refrigerant | coolant can be made uniform in each recessed part whole region. Therefore, each heating element can be efficiently cooled according to the amount of heat generated from each heating element.

  Thus, in this cooler, the flow rate of the refrigerant can be controlled for each part for cooling the heating element, and the heating element can be efficiently cooled. And since the throttle is not provided in a connection part like the prior art, the pressure loss of a refrigerant | coolant does not increase. Therefore, the circulation amount of the refrigerant is not reduced and the cooling performance is not deteriorated.

  In the cooler described above, it is desirable that the opening shape of the connection portion gradually increases as the distance from the inlet of the refrigerant passage increases.

  By adopting such a configuration, the flow rate of the refrigerant can be made uniform over the entire recess. Therefore, since heat can be uniformly exchanged in the entire recess, uniform heat dissipation from the heating element can be realized.

  In the above-described cooler, it is desirable that the refrigerant flow path has an inner peripheral surface formed in a taper shape so that the cross-sectional area of the flow path gradually changes.

  By adopting such a configuration, the flow rate of the refrigerant can be changed in the refrigerant flow path, so that the flow rate of the refrigerant supplied to the recess can be controlled with higher accuracy. In addition, the opening area at the connection portion can be easily adjusted. Therefore, the heating element can be cooled more efficiently.

  In the cooler described above, it is desirable that the refrigerant flow path is formed by an internal space of a hollow rib provided in the casing.

By setting it as such a structure, since a hollow rib is arrange | positioned at the both ends of a recessed part, the intensity | strength of the recessed part with which a cooler is equipped can be improved. Thereby, since a heat generating body can be pressurized and stuck to the sealing surface of a recessed part, the thermal resistance in the sealing surface of a recessed part can be reduced, and the heat dissipation of a heat generating body can be improved. That is, the heating element can be cooled more efficiently.
Further, since the strength of the cooler itself is improved by the hollow rib, the member can be thinned, and the cooler can be reduced in size and weight.

  In the power conversion device using any one of the coolers described above, a semiconductor element that performs power conversion between DC power and AC power, and a heat dissipating unit that dissipates heat generated from the semiconductor element. A power module in which the heat dissipating part is disposed so as to cover the recess of the cooler and the opening of the recess is sealed, and a reactor disposed in contact with the cooler on the opposite side of the opening It is characterized by having.

  Since this power converter includes any one of the coolers described above, the semiconductor element that is a heating element can be efficiently cooled. Moreover, since the reactor which is another heat generating body is arrange | positioned in contact with a cooler on the opposite side to the opening side of a recessed part, a reactor can also be cooled efficiently.

  In the above-described power conversion device, it is preferable that the sealing surface of the opening protrudes from an end surface of the housing on the side where the power module is disposed.

  As described above, since the sealing surface of the opening protrudes outward from the end surface of the housing on the side where the power module is disposed, the workability of the sealing surface of the recess can be improved. The adhesion between the container and the power module can be improved. As a result, the heat dissipation of the semiconductor element can be improved, and the sealing performance on the sealing surface of the recess can be improved.

  According to the cooler and the power conversion device according to the present invention, as described above, the heating element can be efficiently cooled by controlling the flow rate of the refrigerant for each part for cooling the heating element.

It is a disassembled perspective view which shows schematic structure of the inverter apparatus which concerns on embodiment. It is a perspective view of the cooler with which an inverter apparatus is equipped. It is a disassembled perspective view of the heat exchanger shown in FIG. It is a top view which shows schematic structure of a cooler. It is a figure explaining the positional relationship of the outer-frame upper end surface of a housing | casing, and the sealing surface of a recessed part. It is a top view which shows schematic structure of the cooler which concerns on a 1st modification. It is a top view which shows schematic structure of the cooler which concerns on a 1st modification. It is sectional drawing which shows schematic structure of the cooler which concerns on a 2nd modification. It is sectional drawing which shows schematic structure of the cooler which concerns on a 2nd modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a cooler and a power conversion device using the same according to the present invention will be described below in detail based on the drawings. Here, an inverter device for driving a vehicle mounted on an electric vehicle will be described as an example. The inverter device according to the embodiment is provided in a vehicle drive electrical machine system as a control device that controls driving of a three-phase AC motor generator, and converts DC power supplied from a battery constituting an in-vehicle power source into predetermined AC power. Then, the obtained AC power is supplied to the three-phase AC motor generator to control the driving of the three-phase AC motor generator. Moreover, since the three-phase AC motor generator also has a function as a generator, the inverter device also has a function of converting AC power generated by the three-phase AC motor generator into DC power according to the operation mode. Yes.

  The inverter device according to such an embodiment will be described with reference to FIGS. FIG. 1 is an exploded perspective view showing a schematic configuration of the inverter device according to the embodiment. FIG. 2 is a perspective view of a cooler provided in the inverter device. FIG. 3 is a plan view showing a schematic configuration of the cooler. FIG. 4 is a diagram for explaining the positional relationship between the outer frame upper end surface of the housing and the sealing surface of the recess.

  As shown in FIG. 1, the inverter device 10 according to the present embodiment includes power modules 11, 12, and 13 that control driving of three three-phase AC motor generators, a boosting reactor 14, and a power module 11. ˜13 and the reactor 14 to which the reactor 14 is attached, the cooler 30 that cools the power modules 11-13 and the reactor 14, the upper lid 16 that is disposed on the upper surface of the housing 15 and covers the power modules 11-13, and the housing 15 and a lower lid 17 that covers the reactor 14.

  The power modules 11, 12, and 13 include semiconductor elements 21, 22, and 23 that perform power conversion between DC power and AC power, and heat radiating units 24 and 25 that radiate heat generated from the semiconductor elements 21, 22, and 23. , 26. Each of the heat radiating portions 24, 25, and 26 is provided with flat fin bases 24a, 25a, and 26a, and heat radiating fins 24b, 25b, and 26b that protrude from the fin bases 24a, 25a, and 26a. The semiconductor elements 21, 22, and 23 are joined to the fin bases 24a, 25a, and 26a via the insulating members 27, 28, and 29, respectively, on the opposite side to the radiation fins 24b, 25b, and 26b. Thereby, the radiation fins 24b, 25b, and 26b are respectively disposed in the recesses 31, 32, and 33 of the cooler 30 that will be described later.

  As shown in FIGS. 2 and 3, the cooler 30 includes recesses 31, 32, and 33 formed on the upper end surface, and is integrated with the casing 15 of the inverter device 10. Power module mounting surfaces 31a, 32a, and 33a for mounting the power modules 11, 12, and 13 are provided around the recesses 31, 32, and 33, respectively. And each opening of recessed part 31, 32, 33 is the power module attachment surface 31a, 32a of each cooler 30, and each power module 11,12,13 via seal members 36 (refer FIG. 4), such as an O-ring, for example. By being fixed to 33a, it is liquid-tightly sealed. In the present embodiment, the cooler is provided with three recesses (the opening area is the same). However, the number of recesses is not limited to this, and only a number corresponding to the number of power modules may be provided. Good.

The housing 15 includes an outer frame 18 and two hollow ribs 34 and 35 provided in parallel in the longitudinal direction of the housing. An upper lid attachment surface 18 a for attaching the upper lid 16 is formed at the upper end of the outer frame 18, and a lower lid attachment surface 18 b for attaching the lower lid 17 is formed at the lower end of the outer frame 18.
Each of the hollow ribs 34 and 35 is disposed at the center of the casing 15 in the height direction, and both end portions thereof are joined to the outer frame 18. One end portions of the hollow ribs 34 and 35 open to the outside of the housing, and the other end portions are plugged. These hollow ribs 34 and 35 are disposed in the vicinity of both ends of the cooler 30, and the internal spaces of the hollow ribs 34 and 35 serve as refrigerant passages 34 a and 35 a of the cooler 30. Specifically, the internal space of the hollow rib 34 serves as the inflow side refrigerant passage 34a, and the internal space of the hollow rib 35 serves as the outflow side refrigerant passage 35a. These refrigerant passages 34a and 35a are connected to a radiator (not shown), and the refrigerant circulates between the refrigerant passages 34a and 35a and the radiator.

  In this way, the cooler 30 is integrated with the housing 15, and the strength of the cooler 30 is improved by the hollow ribs 34 and 35. Further, the sealing surfaces (power module mounting surfaces 31a, 32a, 33a) of the recesses 31, 32, 33 are formed so as to protrude upward from the upper lid mounting surface 18a, as shown in FIG. Therefore, the workability of the power module attachment surfaces 31a, 32a, and 33a can be improved, so that the adhesion between the cooler 30 and the power modules 11, 12, and 13 can be improved. And since the intensity | strength of the cooler 30 is improving, the power modules 11, 12, and 13 can be attached by pressurizing on the sealing surfaces of the recesses 31, 32, and 33, that is, the power module mounting surfaces 31a, 32a, and 33a. it can. As a result, the adhesion of the power modules 11, 12, and 13 to the power module mounting surfaces 31a, 32a, and 33a is enhanced, so that the thermal resistance of the power module mounting surfaces 31a, 32a, and 33a can be reduced. Therefore, the heat dissipation of the power modules 11, 12, and 13 can be enhanced, and the sealing performance at the openings in the recesses 31, 32, and 33 can be improved.

  Further, the strength of the cooler 30 can be improved, so that the constituent members of the cooler 30 can be thinned, and the cooler 30 can be reduced in size and weight. Furthermore, the reactor 14 disposed on the side opposite to the opening side of the recesses 31 to 33 can be pressed against the cooler 30 to be brought into close contact therewith. Thereby, the heat dissipation of the reactor 14 can be improved.

  As shown in FIGS. 3 and 4, connecting portions 37i to 39o are provided at both ends of the bottoms of the recesses 31 to 33, and the recesses 31 to 33 are connected to the refrigerant passage 34a via these connecting portions 37i to 39o. , 35a. Specifically, the recesses 31, 32, 33 and the inflow side refrigerant passage 34a communicate with each other through the inflow side connection portions 37i, 38i, 39i. Further, the recesses 31, 32, 33 and the outflow side refrigerant passage 35a communicate with each other through the outflow side connection portions 37o, 38o, 39o. Thereby, the refrigerant flowing through the inflow side refrigerant passage 34a is supplied to the recesses 31, 32, 33 via the inflow side connection portions 37i, 38i, 39i, respectively, and the refrigerant supplied to the recesses 31, 32, 33 is supplied. The refrigerant flows out into the outflow side refrigerant passage 35a through the outflow side connection portions 37o, 38o, and 39o, respectively.

  Here, the opening areas (flow channel cross-sectional areas) and shapes of the connection portions 37i, 37o, 38i, 38o, 39i, 39o change in accordance with the distance from the inlet of the inflow side refrigerant passage 34a. Thereby, the flow velocity and flow rate of the refrigerant supplied to the recesses 31, 32, 33 can be arbitrarily varied. The connecting portions 37i and 37o, 38i and 38o, 39i and 39o have symmetrical shapes on the center lines of the recesses 31, 32 and 33 (intermediate positions of the two hollow ribs), respectively, Are equal.

  In the present embodiment, the opening area gradually increases in each of the connection portions 37i, 37o, 38i, 38o, 39i, 39o as the distance from the inlet of the inflow side refrigerant passage 34a increases. That is, the opening shape of each connection part 37i * 37o, 38i * 38o, 39i * 39o is a substantially trapezoid. And the opening area of the connection part 37i * 37o, 38i * 38o, 39i * 39o becomes large in this order. Thereby, regardless of the distance from the inlet of the inflow side refrigerant passage 34a, that is, without being affected by the piping resistance of the inflow side refrigerant passage 34a, the flow rates of the refrigerant in all the recesses 31, 32, 33 are equalized, In the recesses 31, 32, and 33, the refrigerant flow side can be made uniform over the entire area.

  The power module 11, 12, 13 is fixed to the upper surface of the cooler 30 integrated with the housing 15, and the upper cover 16 is mounted on the upper cover mounting surface 18 a with the reactor 14 fixed to the lower surface of the cooler 30. The lower lid 17 is attached to the lower lid attachment surface 18b. Thus, the cooler 30, the power modules 11, 12, 13 and the reactor 14 are protected from rainwater and dust by the outer frame 18, the upper lid 16 and the lower lid 17 of the casing 15.

  Next, operations of the inverter device 10 and the cooler 30 having the above-described configuration will be briefly described. The inverter device 10 boosts the voltage of the DC power supplied from the battery by the reactor 14, converts the voltage into predetermined AC power by the power modules 11, 12, and 13 and supplies the AC power to the three-phase AC motor generator. Further, when the three-phase AC motor generator functions as a generator, the inverter device 10 converts the AC power generated by the three-phase AC motor generator into DC power and supplies it to the battery.

  On the other hand, in the cooler 30, the refrigerant flowing through the inflow side refrigerant passage 34a is supplied to the recesses 31, 32, 33 via the inflow side connection portions 37i, 38i, 39i, respectively. Then, the refrigerant introduced into the recess 31 flows between the radiation fins 24b and is discharged from the outflow side connection portion 37o to the outflow side refrigerant passage 35a. Similarly, the refrigerant introduced into the recess 32 flows between the radiation fins 25b and is discharged from the outflow side connection portion 38o to the outflow side refrigerant passage 35a. Similarly, the refrigerant introduced into the recess 33 flows between the radiation fins 26b and is discharged from the outflow side connection portion 39o to the outflow side refrigerant passage 35a. At this time, since the recesses 31, 32, and 33 are liquid-tightly sealed by the power modules 11, 12, and 13 via the seal member 36, the refrigerant that flows through the recesses 31, 32, and 33 is external. Will not leak.

  Here, the flow rate of the refrigerant flowing through the inflow side refrigerant passage 34a gradually decreases as the distance from the inlet increases due to the influence of the piping resistance, but the opening shapes of the connection portions 37i, 37o, 38i, 38o, 39i, 39o are as follows: Since it has a substantially trapezoidal shape that gradually increases with increasing distance from the inlet of the inflow side refrigerant passage 34a, the flow rates of the refrigerant are equal throughout the recesses 31, 32, and 33, respectively. Further, the opening areas of the connecting portions 37i, 37o, 38i, 38o, 39i, 39o increase in this order, and the flow rates of the refrigerant in all the concave portions 31, 32, 33 are equal. As described above, in the cooler 30, the flow rate of the refrigerant is uniform throughout the recesses 31, 32, 33 regardless of the distance from the inlet of the inflow side refrigerant passage 34a. As a result, heat can be uniformly exchanged in the entire area in each of the recesses 31, 32, 33, so that heat is uniformly radiated from the power modules 11, 12, 13. Therefore, the power module 11, 12, 13 can be efficiently cooled by the cooler 30.

Moreover, in the cooler 30, as a result of the improvement in strength by the hollow ribs 34 and 35 and the improvement in workability of the power module attachment surfaces 31a, 32a and 33a, the thermal resistance in the power module attachment surfaces 31a, 32a and 33a is reduced. Yes. Therefore, the heat dissipation of the power modules 11, 12, and 13 is further enhanced, and the power modules 11, 12, and 13 can be cooled more efficiently.
Furthermore, the reactor 14 is pressurized and adhered to the cooler 30 due to the strength improvement of the cooler 30. Therefore, the reactor 14 can also be efficiently cooled.

  As described above in detail, according to the inverter device 10 according to the present embodiment, the opening shapes of the connection portions 37i, 37o, 38i, 38o, 39i, 39o in the cooler 30 are the same as those of the inflow-side refrigerant passage 34a. The trapezoid gradually increases as the distance from the entrance increases, and the opening areas of the connecting portions 37i, 37o, 38i, 38o, 39i, 39o increase in this order. Thus, in the inverter device 10, the flow rate of the refrigerant can be made uniform in the entire recesses 31, 32, 33 regardless of the distance from the inlet of the inflow side refrigerant passage 34a. 11, 12, 13 can be efficiently cooled.

  Here, a modified example of the cooler provided in the inverter device will be described with reference to FIGS. 5 and 6 are plan views showing a schematic configuration of the cooler according to the first modification. 7 and 8 are cross-sectional views showing a schematic configuration of a cooler according to a second modification.

  In the cooler according to the first modification, the basic configuration is substantially the same as that of the cooler 30, but the opening areas at the respective connecting portions are different. Thereby, the flow volume of a refrigerant | coolant can be changed for every recessed part. Therefore, the flow rate of the refrigerant in each of the recesses 31, 32, 33 can be adjusted according to the heat generation amount of the power modules 11, 12, 13. As a result, the power modules 11, 12, and 13 can be efficiently cooled while suppressing the circulation amount of the refrigerant. Thus, since the circulation amount of the refrigerant can be suppressed, the cooler can be further reduced in size and weight.

For example, if the amount of heat generation is large in the order of the power modules 31, 32, 33, as shown in FIG. do it.
If the heat generation amount of the power module 32 is the largest, as shown in FIG. 6, the opening areas of 38i and 38o may be maximized. Note that the size of the opening areas of the connection portions 37i and 37o and the opening areas of 39i and 39o may be determined according to the amount of heat generated by the power modules 11 and 13. In FIG. 6, since the heat generation amounts of the power modules 11 and 13 are substantially equal, the opening areas of the connecting portions 37i and 37o are smaller than the opening areas of 39i and 39o.

  The basic configuration of the cooler according to the second modified example is substantially the same as that of the cooler 30, but the shape of the inflow side refrigerant passage is different. Specifically, the inner peripheral surface is formed in a taper shape so that the flow passage cross-sectional area of the inflow side refrigerant flow passage 34a gradually changes. Thereby, since the flow velocity of the refrigerant can be changed in the inflow side refrigerant flow path 34a, the flow rate of the refrigerant supplied to the recesses 31, 32, 33 can be controlled with higher accuracy. Moreover, the adjustment of the opening area in the connection portions 37i, 37o, 38i, 38o, 39i, 39o is facilitated.

For example, if the heat generation amount is large in the order of the power modules 31, 32, 33, as shown in FIG. 7, the inflow-side refrigerant flow path 34a has a tapered shape in which the inner diameter gradually decreases toward the downstream side. do it.
If the heat generation amount of the power module 32 is the largest, as shown in FIG. 8, the inner diameter of the inflow-side refrigerant flow path 34 a gradually decreases toward the downstream side, and the inner diameter is reduced in the recess 32. The taper shape may be minimized and then the inner diameter gradually increases.

  Here, the first modification example and the second modification example have been described separately, but of course, the first modification example and the second modification example can be combined.

  It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the case where the opening areas of the recesses 31, 32, and 33 are equal is illustrated, but the opening area of each recess may be different according to the size of the power module. Also by changing the opening area for each of the recesses 31, 32, 33, the flow rate of the refrigerant can be changed for each of the recesses 31, 32, 33 as in the above-described modification.

  In the above-described embodiment, the inverter device for driving a vehicle of an electric vehicle has been exemplified. However, the present invention drives other power conversion devices, for example, power conversion devices such as trains, ships, and aircrafts, and further drives plant equipment. It is also applicable to industrial power converters used as motor control devices, or home power converters used in home solar power generation systems and motor control devices that drive household appliances. Can do.

DESCRIPTION OF SYMBOLS 10 Inverter apparatus 11 Power module 12 Power module 13 Power module 14 Reactor 15 Case 21 Semiconductor element 22 Semiconductor element 23 Semiconductor element 24 Heat radiation part 25 Heat radiation part 26 Heat radiation part 30 Cooler 31 Recess 32 Recess 33 Recess 34 Hollow rib 34a Inflow side Refrigerant passage 35 Hollow rib 35a Outflow side refrigerant passage 37i Inflow side connection portion 37o Outflow side connection portion 38i Inflow side connection portion 38o Outflow side connection portion 39i Inflow side connection portion 39o Outflow side connection portion

Claims (6)

In the cooler integrated in the casing of the power converter,
A refrigerant flow path for flowing refrigerant;
The opening is sealed by the heating element, and a recess for exchanging heat between the heating element and the refrigerant;
A connecting portion connecting the recess and the refrigerant passage;
The cooler, wherein an opening area and a shape of the connection portion are changed corresponding to a distance from an inlet of the refrigerant passage. The cooler according to claim 1, wherein
The opening shape of the connection part gradually increases as the distance from the inlet of the refrigerant passage increases. In the cooler according to claim 1 or 2,
The cooler characterized in that the refrigerant channel has an inner peripheral surface tapered so that the channel cross-sectional area gradually changes. The cooler according to claim 1, wherein
The cooler, wherein the coolant channel is formed by an internal space of a hollow rib provided in the housing. Any one cooler according to claim 1 to claim 4,
A semiconductor element that performs power conversion between DC power and AC power; and a heat dissipation part that dissipates heat generated from the semiconductor element, and the heat dissipation part is disposed so as to cover the recess of the cooler. A power module in which the opening of the recess is sealed;
A reactor arranged in contact with the cooler on the opposite side of the opening;
The power converter characterized by having. In the power converter device according to claim 5,
The sealing surface of the opening protrudes from an end surface on the side where the power module is disposed in the housing.

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