JP2023127196A - electronic component unit - Google Patents

Abstract

To suppress a reduction in temperature estimation accuracy.SOLUTION: An electronic component unit 10 includes a metal part 20, a seal member 41, a reactor 51, a heat conduction part 71, and a temperature sensor 81. The reactor 51 is electrically connected to a switching element. When the switching element turns on, a current flows in the reactor 51. The metal part 20 includes a lid part 21, and a case part 31. The heat conduction part 71 abuts to the lid part 21 and the reactor 51. The temperature sensor 81 is provided in the lid part 21. The lid part 21 and the case part 31 are spaced apart from each other.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to an electronic component unit.

Electronic components electrically connected to the switching element generate heat when the switching element is turned on.
When detecting an abnormality based on the temperature of an electronic component or controlling the current flowing through the electronic component according to the temperature of the electronic component, the temperature of the electronic component is measured by a temperature sensor. When a temperature sensor is provided in an electronic component, the measurement accuracy of the temperature sensor decreases due to the influence of noise. Therefore, as in the configuration disclosed in Patent Document 1, a configuration is adopted in which a heat dissipation sheet is provided in contact with a reactor and a metal case provided with the reactor, and by measuring the temperature of the case with a temperature sensor, electronic parts It is conceivable to measure the temperature indirectly.

JP2017-28221A

However, when electronic components are provided in a case as in the configuration disclosed in Patent Document 1, it is necessary to cool the electronic components by cooling the case with a cooling device so that the electronic components do not become overheated. In the case of such a configuration, it is difficult to grasp how much the case has been cooled by the cooling device, so when estimating the temperature of the electronic component from the temperature of the case, there is a risk that temperature estimation accuracy may be reduced.

An electronic component unit that solves the above problem includes an electronic component that is electrically connected to a switching element so that a current flows when the switching element is turned on, and a first metal part and a second metal part. , a metal part that defines an arrangement space in which the electronic component is provided by the first metal part and the second metal part; a heat conductive part that comes into contact with the first metal part and the electronic component; a temperature sensor provided on a first metal part to measure the temperature of the first metal part, the electronic component unit having the second metal part cooled by a cooling device; The metal part and the second metal part are spaced apart from each other.

The first metal part and the second metal part are spaced apart from each other. It is possible to prevent the first metal part from being cooled by the cooling device. Therefore, even when estimating the temperature of an electronic component from the temperature of a metal part, a decrease in temperature estimation accuracy can be suppressed.

The electronic component unit may include an insulating member that is provided between the first metal part and the second metal part and partitions the arrangement space together with the metal part.
In the electronic component unit, the first metal part may include a main body and a protrusion protruding from the main body toward the electronic component, and the thermally conductive part may be in contact with the protrusion. good.

In the electronic component unit, the protrusion may have a cylindrical shape with a bottom, and may include a cylindrical connection portion extending toward the electronic component and a bottom portion that abuts the heat conduction portion.
In the electronic component unit, the protrusion may be columnar.

In the electronic component unit, the protrusion may include a first protrusion and a second protrusion provided apart from the first protrusion.
In the electronic component unit, the amount of protrusion of the protrusion from the main body may be determined such that the heat conductive portion is compressed by the protrusion.

In the electronic component unit, the first metal part and the second metal part are fastened by a fastening member that applies force in a direction in which the first metal part and the second metal part approach each other. Good too.

The electronic component unit may include an estimator that estimates the temperature of the electronic component based on the temperature measured by the temperature sensor.

According to the present invention, in an electronic component unit in which a metal part provided with electronic components is cooled by a cooling device, even if the temperature sensor is provided in the metal part, the portion of the metal part where the temperature sensor is provided is not connected to the cooling device. cooling can be suppressed. Therefore, even when estimating the temperature of an electronic component from the temperature of a metal part, a decrease in temperature estimation accuracy can be suppressed.

FIG. 3 is a perspective view of the electronic component unit. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1 showing the electronic component unit. FIG. 3 is a perspective view showing a cross section of the electronic component unit. It is a figure which shows the amount of protrusion of a protrusion from a main body. FIG. 7 is a sectional view showing a modification of the electronic component unit. FIG. 7 is a sectional view showing a modification of the electronic component unit. FIG. 7 is a sectional view showing a modification of the electronic component unit. FIG. 7 is a sectional view showing a modification of the electronic component unit. FIG. 7 is a sectional view showing a modification of the electronic component unit. FIG. 7 is a sectional view showing a modification of the electronic component unit.

An embodiment of the electronic component unit will be described below.
<Electronic component unit>
As shown in FIGS. 1 and 2, the electronic component unit 10 includes a metal part 20, a seal member 41 as an insulating member, a fastening member 42, a reactor 51 as an electronic component, a heat conductive part 71, and a temperature It includes a sensor 81 and an estimator 82. In this embodiment, three reactors 51 are provided.

<Metal part>
The metal part 20 includes a lid part 21 as a first metal part and a case part 31 as a second metal part. The lid portion 21 is made of metal. Case portion 31 is made of metal. The metal part 20 is provided between the reactor 51 and other electronic components to suppress the influence of noise generated in the reactor 51 on other electronic components.

The lid portion 21 includes a main body 22 and a protrusion 23. The main body 22 is plate-shaped. In this embodiment, the same number of protrusions 23 as reactors 51 are provided. The number of protrusions 23 may be less than the number of reactors 51. The protrusions 23 are provided at intervals from each other.

As shown in FIGS. 2 and 3, the protrusion 23 has a cylindrical shape with a bottom. The protrusion 23 includes a connecting portion 24 and a bottom portion 27. The connecting portion 24 protrudes from the main body 22 in the thickness direction of the main body 22. The connecting portion 24 has a cylindrical shape, and in this embodiment, it has a rectangular cylindrical shape. The connecting portion 24 includes a first end 25 and a second end 26 . The first end 25 and the second end 26 are opposite ends of the connecting portion 24 in the axial direction. A first end 25 of the connecting portion 24 is an end connected to the main body 22 . The bottom portion 27 is provided at the second end portion 26 of the connecting portion 24 . The bottom portion 27 closes the hole defined by the second end 26 of the connecting portion 24 . The bottom portion 27 is plate-shaped. The thickness direction of the bottom portion 27 and the axial direction of the connecting portion 24 match. Note that "matching" means allowing for some errors.

The case portion 31 includes a main body 32, a peripheral wall 33, and a housing wall 36. The main body 32 is plate-shaped. The peripheral wall 33 is provided at the periphery of the main body 32. The peripheral wall 33 extends in the thickness direction of the main body 32. The peripheral wall 33 has a cylindrical shape, for example, a square cylindrical shape. The axial direction of the peripheral wall 33 and the thickness direction of the main body 32 coincide. The peripheral wall 33 includes a first end 34 and a second end 35. The first end 34 and the second end 35 are opposite ends of the peripheral wall 33 in the axial direction. The first end 34 of the peripheral wall 33 is the end connected to the main body 32. The accommodation wall 36 protrudes from the main body 32 in the thickness direction of the main body 32. The accommodation wall 36 is provided within a region surrounded by the peripheral wall 33. The housing wall 36 is cylindrical. Although not shown, the number of housing walls 36 is the same as the number of reactors 51.

The lid part 21 and the case part 31 are arranged facing each other with a gap between them. Specifically, the lid part 21 and the case part 31 are arranged so that the thickness direction of the main body 22 of the lid part 21 and the thickness direction of the main body 32 of the case part 31 match. In this embodiment, the lid part 21 and the case part 31 are arranged so that the peripheral edge of the main body 22 of the lid part 21 and the second end part 35 of the peripheral wall 33 of the case part 31 face each other with an interval. has been done. The protrusion 23 is provided within a region surrounded by the peripheral wall 33. It can be said that the protrusion 23 protrudes from the main body 22 of the lid part 21 toward the case part 31. The protrusion 23 is provided at a portion of the main body 32 of the case portion 31 surrounded by the housing wall 36 and facing each other with an interval therebetween. In the following description, the direction in which the main body 22 of the lid part 21 and the main body 32 of the case part 31 face each other may be referred to as the height direction.

The metal part 20 is electrically connected to ground. When the electronic component unit 10 is mounted on a vehicle, the metal part 20 is electrically connected to the body of the vehicle. The lid portion 21 and the case portion 31 may be individually connected to ground. Either the lid part 21 or the case part 31 may be connected to ground. Even in this case, by electrically connecting the lid part 21 and the case part 31 with the fastening member 42, the lid part 21 and the case part 31 are electrically connected to the ground.

<Cooling device>
A cooling device 100 is provided in the case portion 31 . The cooling device 100 cools the case portion 31. The cooling device 100 is, for example, a device that cools the case portion 31 by flowing a refrigerant. The refrigerant may be of any type as long as it can cool the cooling device 100, and may be gaseous such as air or liquid such as cooling water. Good too.

<Seal member>
The seal member 41 is provided between the lid part 21 and the case part 31, and together with the lid part 21 and the case part 31, defines an arrangement space A1 in which the reactor 51 and the like are provided. In this embodiment, the seal member 41 is annular. The seal member 41 is provided between the peripheral edge of the main body 22 of the lid portion 21 and the second end portion 35 of the peripheral wall 33. The seal member 41 is made of rubber, for example.

<Fastening member>
The fastening member 42 fixes the lid part 21 and the case part 31. A plurality of fastening members 42 are provided along the periphery of the main body 22 of the lid portion 21. The fastening member 42 may be anything that can fix the lid part 21 and the case part 31, and is, for example, a screw. The fastening member 42 passes through the lid part 21 and is fastened to the case part 31. Thereby, the lid part 21 and the case part 31 are fixed to each other. The fastening member 42 applies force to the lid portion 21 and the case portion 31 in a direction in which the lid portion 21 and the case portion 31 approach each other. As the fastening member 42, a bolt and a nut may be used. In this case, for example, a flange may be provided on each of the peripheral edge of the main body 22 of the lid portion 21 and the second end portion 35 of the peripheral wall 33 of the case portion 31, and a nut may be fastened to a bolt passing through the flange.

<Reactor>
As shown in FIGS. 1 and 2, the reactor 51 is provided in the arrangement space A1. The reactor 51 constitutes a part of the power conversion device 50. The reactor 51 includes two coil units 52 and 56 and a core 55. The coil unit 52 includes a coil 53 and a bobbin 54. The coil unit 56 includes a coil 57 and a bobbin 58. The coils 53 and 57 are, for example, copper conductive wires provided with an insulating coating. The bobbins 54 and 58 are made of resin, for example. Core 55 may be made of any material, such as a ferrite core. The coils 53 and 57 are wound around bobbins 54 and 58. A portion of the core 55 is inserted into the bobbins 54 and 58. Thereby, it can be said that the coils 53 and 57 are wound around the core 55 via the bobbins 54 and 58.

The reactor 51 is provided within a region surrounded by the housing wall 36. Since the protrusion 23 is provided facing the portion of the main body 32 of the case portion 31 surrounded by the housing wall 36, it can be said that the protrusion 23 protrudes toward the reactor 51. The reactor 51 is provided so that the direction in which the two coil units 52 and 56 are lined up coincides with the direction intersecting the thickness direction of the main body 32 of the case portion 31. A region surrounded by the housing wall 36 is filled with potting resin 59.

<Power converter>
Power conversion device 50 includes a capacitor 61, a bus bar 62, and a switching element 63. The power conversion device 50 is provided in the arrangement space A1. The power converter 50 is, for example, a DC/DC converter or an inverter. The power conversion device 50 performs power conversion by the switching operation of the switching element 63. A switching element 63 is electrically connected to the coils 53 and 57. When the switching element 63 is turned on, current flows through the coils 53 and 57. Reactor 51 is an electronic component electrically connected to switching element 63.

<Capacitor and bus bar>
Capacitor 61 is electrically connected to switching element 63. The capacitor 61 may have any shape, and in this embodiment, it is columnar. The capacitor 61 is arranged so that the axial direction and the height direction coincide. The height dimension of the capacitor 61 is longer than the height dimension of the reactor 51. The shortest distance in the height direction from the main body 22 of the lid part 21 to the capacitor 61 is shorter than the shortest distance in the height direction from the main body 22 of the lid part 21 to the reactor 51.

Bus bar 62 is connected to capacitor 61, for example. The shortest distance in the height direction from the main body 22 of the lid part 21 to the bus bar 62 is shorter than the shortest distance in the height direction from the main body 22 of the lid part 21 to the reactor 51.

<Heat conduction part>
The thermally conductive portion 71 is a member having higher thermal conductivity than air and higher than that of the sealing member 41, and is formed of an insulating material. The thermally conductive part 71 is formed based on, for example, silicone resin, epoxy resin, or urethane resin, and is, for example, TIM (Thermal Interface Material). The heat conductive part 71 of this embodiment is sheet-shaped. Although not shown, in this embodiment, the number of heat conductive parts 71 is the same as that of the reactors 51, for example. The number of heat conductive parts 71 may be less than the number of reactors 51. For example, heat conduction parts 71 may be provided corresponding to some of the reactors 51. The number of heat conductive parts 71 may be greater than the number of reactors 51. For example, a plurality of heat conductive parts 71 may be provided for one reactor 51.

The heat conduction part 71 is in contact with the lid part 21 and the reactor 51. More specifically, the heat conduction section 71 is in contact with the protrusion 23 and the reactor 51. The heat conduction portion 71 is in contact with the bottom portion 27 of the protrusion 23 . The heat conduction section 71 is in contact with the coils 53 and 57 of the two coil units 52 and 56.

As shown in FIG. 4, the heat conduction section 71 is compressed by receiving the force from the protrusion 23 and the reactor 51. Specifically, the amount L1 of protrusion from the main body 22 of the protrusion 23 is determined such that the heat conduction part 71 is compressed by the protrusion 23. In this embodiment, the protrusion amount L1 is determined so that the heat conduction part 71 is compressed by the protrusion 23 when the lid part 21 and the case part 31 are fixed to each other by the fastening member 42.

In addition, when the rigidity of the lid part 21 is low, when force is applied from the fastening member 42 to the periphery of the main body 22 of the lid part 21 in the thickness direction of the main body 22, the center part of the main body 22 deforms in the direction away from the case part 31. I will do it. In this case, the protrusion amount L1 of the protrusion 23 from the main body 22 is set so that the heat conductive part 71 can be compressed, taking into consideration the deformation of the main body 22 due to warping.

<Temperature sensor and estimation section>
As the temperature sensor 81, any temperature sensor such as a thermistor or a thermocouple may be used. As shown in FIGS. 2 and 3, the temperature sensor 81 is provided to measure the temperature of the lid 21. As shown in FIGS. In this embodiment, the temperature sensor 81 is provided on the protrusion 23 . Specifically, the temperature sensor 81 is provided on a surface of the connecting portion 24 that partitions the arrangement space A1.

An estimator 82 is connected to the temperature sensor 81 . The estimation unit 82 acquires a measured value from the temperature sensor 81. The estimation unit 82 estimates the temperature of the reactor 51 from the temperature of the lid 21 measured by the temperature sensor 81. The thermal conductivity of the lid part 21, the shape of the lid part 21, the thermal conductivity of the heat conductive part 71, the shape of the heat conductive part 71, and the position of the temperature sensor 81 are known. Therefore, the thermal resistance of the path from the reactor 51 to the temperature sensor 81 can be known in advance. The estimation unit 82 estimates the temperature of the reactor 51 based on the temperature measured by the temperature sensor 81 and the thermal resistance. The estimation unit is, for example, a computer including a processor and a storage unit.

<Effect>
When the power conversion device 50 is used, a switching operation of the switching element 63 is performed. When the switching element 63 is turned on, current flows through the reactor 51. When current flows through the reactor 51, the reactor 51 generates heat. Specifically, the coils 53, 57 and core 55 generate heat. The cooling device 100 cools the reactor 51 via the case portion 31 by cooling the case portion 31 . If the lid part 21 and the case part 31 are in contact with each other, the lid part 21 will also be cooled by the cooling device 100, but it is difficult to know how much the lid part 21 has been cooled by the cooling device 100. Because of this difficulty, when estimating the temperature of the reactor 51 from the temperature detected by the temperature sensor 81, there is a risk that the estimation accuracy will decrease. In this embodiment, a sealing member 41 is provided between the lid part 21 and the case part 31. Therefore, cooling of the lid portion 21 by the cooling device 100 is suppressed. Therefore, even when estimating the temperature of the reactor 51 from the temperature of the metal part 20, a decrease in temperature estimation accuracy can be suppressed.

<Effect>
The effects of this embodiment will be explained.
(1) By providing the seal member 41, the lid portion 21 and the case portion 31 are separated from each other. It is possible to suppress the lid portion 21 from being cooled by the cooling device 100. Therefore, even when estimating the temperature of the reactor 51 from the temperature of the metal part 20, a decrease in temperature estimation accuracy can be suppressed.

(2) The lid portion 21 includes a protrusion 23 that protrudes from the main body 22. The shortest distance in the height direction from the main body 22 of the lid part 21 to the capacitor 61 is shorter than the shortest distance in the height direction from the main body 22 of the lid part 21 to the reactor 51. The same applies to the bus bar 62. For this reason, when the lid part 21 is made into a plate shape, in order to bring the lid part 21 and the heat conductive part 71 into contact, it is necessary to make the heat conductive part 71 thicker or to make the reactor 51 larger. On the other hand, by providing the protrusion 23, the lid part 21 can be locally brought closer to the reactor 51. This eliminates the need to thicken the heat conduction section 71 or increase the size of the reactor 51.

Note that it is also possible to arrange the capacitor 61 so that the axial direction of the capacitor 61 intersects with the height direction. In this case, the shortest distance in the height direction from the main body 22 of the lid part 21 to the capacitor 61 can be greater than the shortest distance in the height direction from the main body 22 of the lid part 21 to the reactor 51. The same can be said of the bus bar 62 by changing the arrangement position of the bus bar 62. However, there are cases where the capacitor 61 and the bus bar 62 cannot be arranged as described above due to restrictions in the arrangement. For example, when trying to reduce the projected area of the electronic component unit 10 when viewed from the height direction, it may not be possible to arrange the capacitor 61 so that the axial direction of the capacitor 61 intersects with the height direction. In this way, even if there are restrictions on the arrangement of the capacitor 61 and the bus bar 62, by providing the protrusion 23, the lid part 21 can be locally brought close to the reactor 51 while avoiding the capacitor 61 and the bus bar 62. be able to.

(3) By providing the protrusion 23, the contact area between the lid portion 21 and the heat conduction portion 71 can be reduced. The force applied from the lid part 21 to the heat conduction part 71 can be increased. The degree of adhesion between the lid part 21 and the heat conductive part 71 can be improved. Thereby, heat can be easily conducted from the reactor 51 to the lid part 21.

(4) The protrusion 23 includes a cylindrical connecting portion 24 and a bottom portion 27. The volume of the protrusion 23 can be made smaller than when the protrusion 23 is columnar. Furthermore, the heat capacity of the protrusion 23 is reduced compared to when the protrusion 23 is columnar. When the temperature of the reactor 51 changes, the temperature of the protrusion 23 tends to change in accordance with this change. Therefore, the responsiveness of the temperature sensor 81 to temperature changes in the reactor 51 can be improved.

(5) The protrusion amount L1 of the protrusion 23 from the main body 22 is determined so that the heat conduction part 71 is compressed by the protrusion 23. Heat can be more easily conducted from the reactor 51 to the lid part 21 than when the protrusion 23 does not compress the heat conduction part 71.

In particular, in the embodiment, the protrusion amount L1 is determined so that the heat conduction part 71 is compressed by the protrusion 23 when the lid part 21 and the case part 31 are fixed to each other by the fastening member 42. Therefore, when the lid part 21 and the case part 31 are fixed to each other by the fastening member 42, the heat conductive part 71 can be compressed by the protrusion 23.

(6) The electronic component unit 10 includes a fastening member 42. The fastening member 42 applies force to the lid portion 21 and the case portion 31 in a direction in which the lid portion 21 and the case portion 31 approach each other. When this force is transmitted to the heat conduction part 71 via the protrusion 23, the heat conduction part 71 can be compressed. Moreover, the degree of adhesion between the protrusion 23 and the heat conduction part 71 and the degree of adhesion between the reactor 51 and the heat conduction part 71 can be improved. Thereby, heat can be easily conducted from the reactor 51 to the lid part 21.

(7) In order to measure the temperature of the reactor 51, a temperature sensor may be provided between the two coil units 52 and 56. In this case, it is necessary to manufacture a dedicated temperature sensor according to the shape of the reactor 51. On the other hand, by providing the temperature sensor 81 on the lid portion 21, a general-purpose product can be used as the temperature sensor 81. Manufacturing costs can be reduced compared to manufacturing a dedicated temperature sensor.

(8) When installing a temperature sensor between the two coil units 52 and 56 in order to measure the temperature of the reactor 51, the interval between the two coil units 52 and 56 is to ensure a space for installing the temperature sensor. needs to be made larger. On the other hand, by providing the temperature sensor 81 on the lid portion 21, there is no need to increase the distance between the two coil units 52 and 56. Therefore, the reactor 51 can be made smaller.

(9) By providing the temperature sensor 81 on the lid portion 21, the temperature sensor 81 can be separated from the reactor 51 compared to the case where the temperature sensor is provided between the two coil units 52 and 56. Thereby, it is possible to suppress the measurement accuracy of the temperature sensor 81 from decreasing due to noise generated in the reactor 51. Further, since the lid portion 21 is electrically connected to the ground, potential fluctuations due to noise generated in the reactor 51 are small. Therefore, it is possible to suppress the measurement accuracy of the temperature sensor 81 from decreasing due to noise generated in the reactor 51.

(10) When the potting resin is filled between the two coil units 52 and 56, voids may occur in the potting resin. When a temperature sensor is provided between the two coil units 52 and 56, the measurement accuracy of the temperature sensor may be reduced due to voids. On the other hand, by conducting heat to the temperature sensor 81 via the heat conduction section 71, the influence of voids can be reduced.

(Example of change)
The embodiment can be modified and implemented as follows. Each embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

○ As shown in FIG. 5, the connecting portion 24 and the bottom portion 27 may be made thinner than the main body 22. In this case, the heat capacity of the protrusion 23 is lower than when the connecting portion 24 and the bottom portion 27 are made to have the same thickness as the main body 22 or are made thicker than the main body 22. When the temperature of the reactor 51 changes, the temperature of the protrusion 23 tends to change in accordance with this change. Therefore, the responsiveness of the temperature sensor 81 to temperature changes in the reactor 51 can be improved.

- As shown in FIG. 6, the bottom portion 27 may be made thinner than the main body 22. Furthermore, the portion of the connecting portion 24 from the second end portion 26 to the portion where the temperature sensor 81 is provided may be made thinner than the main body 22 . That is, a portion of the heat transfer path from the heat conduction section 71 to the temperature sensor 81 may be made thinner than the main body 22 . Even in this case, the responsiveness of the temperature sensor 81 to temperature changes in the reactor 51 can be improved.

- As shown in FIG. 7, the protrusion 110 may be columnar. Moreover, the heat conduction part 72 may be provided so that it may contact|abut one coil unit 52 among the two coil units 52 and 56. A force is applied to the heat conductive portion 72 from the protrusion 110 . At this time, a reaction force from the heat conduction part 72 acts on the protrusion 110. When the protrusion 110 is columnar, the lid 21 is less likely to be deformed by reaction force than the protrusion 23 of the embodiment. For this reason, when the protrusion 110 is formed into a columnar shape, force is easily applied from the protrusion 110 to the heat conduction part 72, and the temperature is easily conducted from the reactor 51 to the lid part 21 via the heat conduction part 72. Further, as shown in FIG. 7, the temperature sensor 81 may be provided in the main body 22 of the lid part 21.

As shown in FIG. 8, the protrusion 120 may include a first protrusion 121 and a second protrusion 122 provided apart from the first protrusion 121. In this case, the heat conduction part 73 provided corresponding to the first protrusion 121 and the heat conduction part 74 provided corresponding to the second protrusion 122 may be provided separately. . In the example shown in FIG. 8, a heat conduction section 73 is provided between the first protrusion 121 and the coil unit 52. A thermally conductive portion 74 is provided between the second protrusion 122 and the coil unit 56. In this case, the temperature sensor 81 may be provided between the first protrusion 121 and the second protrusion 122. By providing the temperature sensor 81 between the first protrusion 121 and the second protrusion 122, the temperature sensor 81 can be provided at a midpoint between the two coil units 52 and 56. If there is a difference between the distance from the temperature sensor 81 to the coil unit 52 and the distance from the temperature sensor 81 to the coil unit 56, the influence of heat from the coil units 52 and 56 closer to the temperature sensor 81 will be greater. By providing the temperature sensor 81 at the midpoint between the two coil units 52 and 56, the temperatures of the two coil units 52 and 56 can be accurately measured using one temperature sensor 81. Note that the first protrusion 121 and the second protrusion 122 may have the same shape as the protrusion 23 of the embodiment, or may be columnar. Further, one of the first protrusion 121 and the second protrusion 122 may have a shape similar to the protrusion 23 of the embodiment, and the other may have a columnar shape.

- As shown in FIG. 9, a bracket 90 may be used as the first metal part. In addition, in the electronic component unit 200 of FIG. 9, the same members as those in the electronic component unit 10 are given the same reference numerals, and explanations thereof will be omitted.

The lid portion 210 has a plate shape. The lid part 21 of the electronic component unit 10 corresponds to the first metal part in the present invention, but the lid part 210 does not correspond to the first metal part.

Bracket 90 includes a first portion 91, two second portions 92, 93, and two third portions 94, 95. The first portion 91 is plate-shaped. The second portion 92 extends from one end of the first portion 91 in the thickness direction of the first portion 91 . The second portion 93 extends from the other end of the first portion 91 in the thickness direction of the first portion 91 . That is, the two second parts 92 and 93 are provided apart from each other. A third portion 94 is provided at an end of the second portion 92 opposite to the end connected to the first portion 91 . A third portion 95 is provided at an end of the second portion 93 opposite to the end connected to the first portion 91 . The third portions 94 and 95 are provided so that the direction in which they extend from the ends connected to the second portions 92 and 93 is the direction in which the first portion 91 extends. Bracket 90 is provided so that first portion 91 and heat conduction portion 71 are in contact with each other. An insulating member 96 is provided between the two third portions 94 and 95 and the case portion 31. The insulating member 96 is, for example, a rubber member. An insulating member 96 is provided between the third portions 94, 95 and the main body 32 of the case portion 31, and defines an arrangement space A2 in which the reactor 51 and the like are provided together with the bracket 90 and the case portion 31. In the embodiment of FIG. 9, an insulating member 96 functions as an adhesive and fixes the bracket 90 and the case part 31. That is, the bracket 90 and the case portion 31 are spaced apart from each other.

Although the bracket 90 in FIG. 9 is fixed to the main body 32 of the case portion 31, it may be fixed to another member. In this case, the insulating member 96 may not be provided. That is, the bracket 90 and the case portion 31 may be spaced apart from each other and may define the arrangement space A2. Here, the arrangement space in the present invention is a space sandwiched between two metal members, and refers to a space in which an electronic component is provided. In other words, the arrangement space in the present invention is a space partitioned by two metal members arranged facing each other with a gap between them, and refers to a space in which electronic components are provided.

Note that the temperature sensor 81 may be provided in any of the first portion 91, the second portions 92 and 93, and the third portions 94 and 95.
○ As shown in FIG. 10, the case portion 31 may include a wall portion 37. Note that in the electronic component unit 300 of FIG. 10, the same members as those in the electronic component unit 10 are given the same reference numerals, and explanations thereof will be omitted. The wall portion 37 extends between the main body 22 of the lid portion 21 and the main body 32 of the case portion 31. The wall portion 37 is provided within a region surrounded by the peripheral wall 33. Therefore, the distance from the reactor 51 to the wall 37 is shorter than the distance from the reactor 51 to the peripheral wall 33. The wall portion 37 may be singular or plural. The wall portion 37 may be provided between each power converter device 50. The fastening member 42 fastens the lid portion 21 and the wall portion 37. The warpage that occurs in the lid portion 21 due to the fastening of the fastening member 42 increases as the position moves away from the fastening member 42 . By providing the wall portion 37, the fastening member 42 can be provided near the reactor 51. Compared to the case where the wall portion 37 is not provided, warping of the lid portion 21 can be suppressed. It is possible to prevent the protrusion 23 from separating from the heat conduction section 71 due to the warpage that occurs in the lid section 21 .

- The lid part 21 does not need to include the protrusion 23. In this case, the lid portion 21 may be plate-shaped.
- The lid part 21 and the case part 31 may be fixed by a member different from the fastening member 42. For example, the lid part 21 and the case part 31 may be fixed by members that can be fitted into each other. Moreover, the lid part 21 and the case part 31 may be fixed by welding.

The electronic component unit 10 may include a capacitor 61 instead of the reactor 51. That is, the electronic component that the protrusion 23 comes into contact with via the heat conduction part 71 may be the capacitor 61 . Further, the electronic component unit 10 may include a capacitor 61 in addition to the reactor 51. In this case, the protrusion 23 and the heat conduction part 71 are provided corresponding to the reactor 51 and the capacitor 61, respectively. Further, the electronic component unit 10 may include any electronic component as long as it is connected to the switching element.

The number of reactors 51 included in the electronic component unit 10 may be changed as appropriate. In this case, the number of accommodation walls 36, protrusions 23, and heat conduction parts 71 may be changed according to the number of reactors 51.

The heat conduction part 71 only needs to be in contact with the protrusion 23 and the reactor 51, and does not need to be compressed.

A1...Arrangement space, 10...Electronic component unit, 20...Metal part, 21...Lid part which is the first metal part, 22...Main body, 23...Protrusion part, 24...Connection part, 27...Bottom part, 31...Second part 41... Seal member, 42... Fastening member, 51... Reactor as an electronic component, 71... Heat conduction part, 81... Temperature sensor, 82... Estimating part.

Claims (9)

an electronic component that is electrically connected to a switching element so that a current flows when the switching element is turned on;
a metal part having a first metal part and a second metal part, the first metal part and the second metal part defining a placement space in which the electronic component is provided;
a thermally conductive part that comes into contact with the first metal part and the electronic component;
An electronic component unit comprising a temperature sensor provided on the first metal part and measuring the temperature of the first metal part, the second metal part being cooled by a cooling device,
In the electronic component unit, the first metal part and the second metal part are spaced apart from each other. The electronic component unit according to claim 1, further comprising an insulating member provided between the first metal part and the second metal part and partitioning the arrangement space together with the metal part. The first metal part is
The main body and
a protrusion protruding from the main body toward the electronic component;
The electronic component unit according to claim 1 or 2, wherein the thermally conductive portion is in contact with the protrusion. The protrusion has a cylindrical shape with a bottom,
a cylindrical connection portion extending toward the electronic component;
The electronic component unit according to claim 3, further comprising a bottom portion that contacts the heat conductive portion. The electronic component unit according to claim 3, wherein the protrusion is columnar. The protrusion is
a first protrusion;
The electronic component unit according to any one of claims 3 to 5, further comprising a second protrusion provided apart from the first protrusion. The electronic component unit according to any one of claims 3 to 6, wherein the amount of protrusion of the protrusion from the main body is determined such that the thermally conductive part is compressed by the protrusion. . The first metal part and the second metal part are fastened by a fastening member that applies force in a direction in which the first metal part and the second metal part approach each other. The electronic component unit according to any one of Item 7. The electronic component unit according to any one of claims 1 to 8, further comprising an estimator that estimates the temperature of the electronic component based on the temperature measured by the temperature sensor.

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