Attachment device of switching element, and electrically driven compressor comprising the same

Abstract

To provide an attachment device capable of also improving assembling performance, while ensuring heat-radiation performance as well as insulation performance of a switching element.SOLUTION: An attachment device 28 of a switching element 13 attaches the switching element of an inverter to a base plate 24 that constitutes a heat sink. There is provided a metal fixed plate 26, and the fixed plate 26 comprises: first and second pressing plate parts 36, 37 each that press the switching element 13 to the base plate 24, that abut on a face on an opposite side of the base plate 24 of the switching element 13; and heat-radiation plate parts 38 each that receive heat generated by the switching element 13 by coming into surface contact with the switching element 13.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a mounting device for mounting a switching element of an inverter, and to an electric compressor including the same. [Background technology]

[0002] For example, in the case of electric compressors used in vehicle air conditioners, inverter-integrated electric compressors are used, in which the inverter is mounted in an inverter-accommodating section formed in the housing to reduce switching noise. The switching elements that make up this inverter are IGBTs, SiC-MOSFETs, etc., and generate heat when current is applied. For this reason, the housing of the electric compressor serves as a heat sink, and the switching elements are arranged in a heat exchange relationship with the housing directly or via a base plate, etc.

[0003] In this case, the conventional method of mounting the switching element was to screw it in place with an insulating sheet (insulator) in between, but due to the influence of the recent trend toward higher voltages in this type of electric compressor, there was a problem that the insulation distance could not be ensured by screwing it in. Therefore, a method has been developed in which the switching element is mounted in the housing by pressing it against the housing with a spring member (spring element) (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7357780 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when using a spring member to press down, the fixing force is inevitably weaker than when using screws, and the insulating sheet cannot be effectively crushed, which creates an air gap between the switching element and the housing (or base plate), increasing contact resistance and reducing heat dissipation performance.

[0006] The present invention has been made to solve the above-mentioned conventional technical problems, and aims to provide a mounting device that can improve assembly while ensuring the heat dissipation performance and insulation performance of a switching element, and an electric compressor equipped with the same. [Means for solving the problem]

[0007] The switching element mounting device of the present invention is for mounting a switching element of an inverter to a mounting portion that constitutes a heat sink, and is characterized by having a metal fixing plate, which has a pressing portion that abuts against the surface of the switching element opposite the mounting portion and presses the switching element against the mounting portion, and a heat dissipation portion that receives heat generated by the switching element by making surface contact with the surface of the switching element opposite the mounting portion.

[0008] The switching element mounting device of the invention of claim 2 is characterized in that in the above invention, the fixing plate has a base for fixing the fixing plate to a predetermined location, the pressing portion extends from mutually spaced portions of the base in the direction of the switching element and consists of first and second pressing plate portions that abut against both side portions of the switching element, and the heat dissipation portion consists of approximately T-shaped heat dissipation plate portions that extend from the base between the first and second pressing plate portions in the direction of the switching element and then wrap around to the tip side of each pressing plate portion.

[0009] The mounting device for a switching element according to the invention of claim 3 is characterized in that in the above invention, the heat dissipation plate portion is configured to be more flexible than the first and second pressing plate portions.

[0010] The switching element mounting device of the invention of claim 4 is characterized in that, in the invention of claim 2, the fixed plate has multiple sets of first and second pressing plate portions and heat dissipation plate portions formed thereon, connected at the base, and multiple switching elements arranged side by side in each set are mounted to the mounting portion, and slits are provided between the second pressing plate portion and the first pressing plate portion of adjacent sets, cutting from their tips toward the base.

[0011] The electric compressor of the invention of claim 5 is characterized by comprising a mounting device for a switching element of each of the above inventions, a housing that constitutes a heat sink, and a motor that is provided within the housing and driven by an inverter.

[0012] The electric compressor of the invention of claim 6 is characterized in that in the above invention, the mounting portion is a base plate, the base of the fixing plate is screwed to the base plate, the switching element is pressed against the base plate by the pressing portion of the fixing plate via an insulating sheet, and this base plate is arranged in a heat exchange relationship with the housing, and together with the housing, forms a heat sink. [Effects of the Invention]

[0013] According to the present invention, a switching element mounting device for mounting inverter switching elements to a mounting portion constituting a heat sink is provided with a metal fixing plate, and this fixing plate has a pressing portion that abuts the surface of the switching element opposite the mounting portion and presses the switching element against the mounting portion, and a heat dissipation portion that receives heat generated by the switching element by making surface contact with the surface of the switching element opposite the mounting portion, so that the pressing portion of the fixing plate presses the switching element against the mounting portion, and the heat dissipation portion can further receive heat from the switching element.

[0014] This allows the heat generated by the switching element to be transferred to both the mounting portion and the heat dissipation portion of the fixing plate, improving the heat dissipation performance of the switching element. Furthermore, because the switching element is pressed and fixed to the mounting portion by the pressing portion of the fixing plate, a longer insulation distance from the surface of the mounting portion that charges the switching element can be ensured compared to screw fastening, improving insulation performance. Furthermore, the pressing force of the pressing portion can be adjusted by the amount of interference with the switching element and the spring constant, making it easy to deal with shrinkage of the resin in the switching element due to heat, vibration, or external forces during installation.

[0015] As a result, it is possible to ensure the heat dissipation and insulation performance of the switching elements as a whole, and it is also possible to improve the fixing quality and vibration resistance, as well as the ease of assembly, compared to when the switching elements are fastened with screws.

[0016] Furthermore, as in the invention of claim 2, the fixing plate is provided with a base for fixing the fixing plate to a predetermined position, the pressing portion is composed of first and second pressing plate portions that extend from mutually spaced portions of the base in the direction of the switching element and abut against both side portions of the switching element, and the heat dissipation portion is composed of approximately T-shaped heat dissipation plate portions that extend from the base between the first and second pressing plate portions in the direction of the switching element and then wrap around to the tip side of each pressing plate portion, thereby resulting in a structure that presses the switching element in three places and reduces damage to the switching element by the fixing plate.

[0017] In particular, if the heat sink portion is configured to be more flexible than the first and second pressing plate portions, as in the invention of claim 3, the heat sink portion can make good surface contact with the switching element, thereby further improving heat dissipation performance.

[0018] Furthermore, when attaching a plurality of switching elements arranged side by side to an attachment portion, a plurality of sets of first and second pressing plate portions and heat dissipation plate portions are formed on the fixing plate with the sets connected at the base, and each switching element is attached to the attachment portion in each set, as in the invention of claim 4. In this case, if a slit is provided between the second pressing plate portion and the first pressing plate portion of adjacent sets, cutting from their tips toward the base, each switching element can be stably attached to a single fixing plate even if there is variation in the thickness dimensions of adjacent switching elements.

[0019] Furthermore, by adopting the switching element mounting device of each of the above inventions in an electric compressor having a housing that forms a heat sink as in the invention of claim 5 and a motor that is installed within this housing and driven by an inverter, the switching element can be stably mounted on the electric compressor, and further, the heat from the switching element can be smoothly transferred to the housing by the fixing plate.

[0020] In this case, as in the invention of claim 6, the mounting portion is formed of a base plate, the base of the fixing plate is screwed to the base plate, the switching element is pressed against the base plate by the pressing portion of the fixing plate via an insulating sheet, and this base plate is arranged in a heat exchange relationship with the housing to form a heat sink together with the housing.This makes it possible to attach the switching element to the base plate with the fixing plate and assemble it, and then attach it to the electric compressor, making it possible to further improve assembly workability. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view of an electric compressor to which a switching element mounting device according to an embodiment of the present invention is applied; [Figure 2] 2 is an enlarged cross-sectional view of an inverter accommodating portion of the electric compressor of FIG. 1. [Figure 3] 2 is an enlarged cross-sectional view of a switching element portion of the electric compressor shown in FIG. 1. [Figure 4]2 is a plan view of the electric compressor of FIG. 1 in a state where a switching element is attached to a base plate. [Figure 5] 2 is a perspective view of the electric compressor of FIG. 1 in a state where a switching element is attached to a base plate. [Figure 6] 6 is a perspective view illustrating a procedure for attaching a switching element to the base plate of FIG. 5 using a fixing plate. [Figure 7] 6 is a perspective view illustrating a procedure for attaching the base plate, on which the switching elements of FIG. 5 are attached, to the inverter control board. [Figure 8] 8 is a perspective view illustrating a procedure for attaching the inverter control board, to which the base plate of FIG. 7 is attached, to the housing. DETAILED DESCRIPTION OF THE INVENTION

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1 is a cross-sectional view of an electric compressor 1 according to an embodiment of the present invention. (1) Overall configuration of electric compressor 1 The electric compressor 1 of the embodiment is a so-called inverter-integrated electric compressor, and constitutes part of a refrigerant circuit of a vehicle air conditioner that conditions the interior of a vehicle (not shown). The electric compressor 1 includes a metal (aluminum) housing 2 that houses a motor 6 and a compression mechanism 7 driven by a rotating shaft 5 of the motor 6, an inverter circuit section 3 (the inverter of the present invention) that drives the motor 6, and a filter circuit section 4 that absorbs high-frequency components of a switching current.

[0023] In the embodiment, an inverter accommodating section 8 is configured on the outer surface of the housing 2 at one end in the axial direction of the rotating shaft 5 of the motor 6, and an opening 9 of this inverter accommodating section 8 is closed openably and closably by a cover member 11. The inverter circuit section 3 and the filter circuit section 4 are individually accommodated in the inverter accommodating section 8 from the axial direction of the rotating shaft 5 of the motor 6, and are configured to be detachably attached to the housing 2. Note that while the drawings show the electric compressor 1 of the embodiment with the inverter accommodating section 8 facing up, in reality it is disposed horizontally with the inverter accommodating section 8 on one side.

[0024] In this embodiment, the motor 6 is a three-phase synchronous motor (brushless DC motor), and the compression mechanism 7 is, for example, a scroll-type compression mechanism. The compression mechanism 7 is driven by the rotating shaft 5 of the motor 6 and compresses and discharges the refrigerant into the refrigerant circuit. A low-temperature gas refrigerant is drawn into the housing 2 from an evaporator (also called a heat sink), which also constitutes part of the refrigerant circuit. This cools the inside of the housing 2. The inverter accommodating section 8 is separated from the inside of the housing 2 in which the motor 6 is accommodated by a partition wall 12, which forms the bottom surface of the inverter accommodating section 8, and this partition wall 12 is also cooled by the low-temperature gas refrigerant.

[0025] (2) Configuration of inverter circuit section 3 Next, we will explain the configuration of the inverter circuit unit 3. The inverter circuit unit 3 includes a power module 14 mounted with a plurality of (six in this embodiment) switching elements 13 (IGBTs in this embodiment) that constitute the arms of each phase of the three-phase inverter circuit, and an inverter control board 17 mounted with a control circuit 16.

[0026] The inverter circuit unit 3 converts DC power supplied from a vehicle battery (not shown) into three-phase AC power and supplies it to the stator coil 18 of the motor 6. For this reason, the connection points between the upper arm switching element 13 and the lower arm switching element 13 of each phase are connected via three lead-out terminals 19 that are drawn out from the partition wall 12 of the housing 2 and protrude in the axial direction, and the power supply terminals of the upper arm switching elements 13 and the ground terminals of the lower arm switching elements 13 are connected to the power harness from the battery described above via the filter circuit unit 4 and a high-power connector (HV connector) 21.

[0027] In this case, the lead-out terminals 19, to which the connection points between the upper-arm switching elements 13 and the lower-arm switching elements 13 of each phase are connected, penetrate the partition wall 12 and are connected to the stator coil 18 of the motor 6 inside the housing 2. The power supply terminals and the ground terminals are electrically connected to the power harness via the filter circuit unit 4, the high-power connector 21 described above, etc.

[0028] (3) Configuration of power module 14 Next, the configuration of the power module 14 will be described with further reference to Figures 2 to 6. The power module 14 is configured by mounting the six switching elements 13 described above on a base plate 24 (an embodiment of the mounting portion in the present invention, which forms a heat sink together with the housing 2 as described below) made of a metal plate with high heat dissipation properties (aluminum in this embodiment) with two fixing plates 26 made of a metal plate with spring properties. Each fixing plate 26 is fixed to the base plate 24 (a predetermined location in the present invention) with a screw 27, and these fixing plates 26 and screws 27 form a mounting device 28 for the switching elements 13 of the present invention.

[0029] In this case, sleeves 31 are attached to the base plate 24 at three locations, and the inverter control board 17 is provided on the partition wall 12 side via these sleeves 31 to form the inverter circuit section 3. These sleeves 31 maintain an insulating distance between the power module 14 and the inverter control board 17. Furthermore, the base plate 24 is previously formed with two spaced apart screw holes 41 for screwing the fixing plate 26 (only one hole is shown in FIG. 6).

[0030] (4) Mounting structure of switching element 13 Next, the configuration of the fixing plate 26 constituting the mounting device 28 for the switching element 13 described above and the mounting structure for the switching element 13 using the fixing plate 26 will be described in detail. The fixing plate 26 of the embodiment is formed by cutting out a metal plate into a predetermined shape and then bending it. In the embodiment, the fixing plate 26 includes a base 33 having a screw hole 32 for inserting a screw 27 formed in the center in the longitudinal direction, and a plurality (three in the embodiment) of sets of first and second pressing plate portions 36, 37 and a heat sink plate portion 38 arranged side by side and connected to the base 33. That is, the fixing plate 26 of the embodiment includes three sets of first and second pressing plate portions 36, 37 and a heat sink plate portion 38, which are connected to the base 33.

[0031] Of these, the first and second pressing plate portions 36, 37 each extend from a mutually spaced apart portion of the base portion 33 in a direction away from the base portion 33. In this case, as shown in Fig. 2, each pressing plate portion 36, 37 rises substantially vertically from the base portion 33 and then has a shape that is bent at a substantially right angle in a direction away from the base portion 33. These first and second pressing plate portions 36, 37 constitute the pressing portion of the present invention.

[0032] On the other hand, the heat sink 38 extends in a direction away from the base 33 between the first and second pressing plates 36, 37. In this case, as shown in FIG. 2, the heat sink 38 rises substantially vertically from the base 33, then drops down at one end and is bent at a substantially right angle in a direction away from the base 33. The tip of the heat sink 38 is substantially T-shaped, wrapping around to the tip sides of the pressing plates 36, 37. Furthermore, the width of the heat sink 38 is narrower than the width of the pressing plates 36, 37, which makes the heat sink 38 more flexible than the pressing plates 36, 37. The heat sink 38 constitutes the heat sink of the present invention.

[0033] In the embodiment, a gap is formed between the heat dissipation plate portion 38 of the fixed plate 26 and each of the pressing plate portions 36, 37. In addition, between adjacent pairs of the second pressing plate portion 37 and the first pressing plate portion 36, a slit 39 is formed cutting from the tip thereof toward the base portion 33, thereby allowing the adjacent second pressing plate portion 37 and first pressing plate portion 36 to deform independently.

[0034] Next, a description will be given of the procedure for attaching the switching elements 13. First, the three upper arm switching elements 13 are arranged in a row on one surface (hereinafter referred to as the upper surface) of the base plate 24 on one side of the screw hole 41. The three lower arm switching elements 13 are also arranged on the other side of the screw hole 41 on the upper surface of the base plate 24.

[0035] At this time, each switching element 13 is arranged with one surface (lower surface 13A shown in FIG. 3) that is charged facing the base plate 24 (the insulating sheet 42 side described later), and the terminals 43 of the switching elements 13 in each row are adjacent to each other and are arranged so as to stand up from the base plate 24. In addition, an insulating sheet 42 is interposed between the switching elements 13 in each row and the base plate 24, as shown in FIGS. 1 to 3.

[0036] Next, the fixing plates 26 are placed on top of the switching elements 13 in each row as shown by the arrows in Figure 6, the screw holes 32 of the fixing plates 26 are aligned with the screw holes 41 of the base plate 24, screws 27 are inserted, and the two fixing plates 26 are fixed to the base plate 24 with the screws 27 (Figures 4 and 5).

[0037] In this state, the first and second pressing plate portions 36, 37 of each set of the fixing plate 26 abut on both sides of the other surface of each switching element 13 (the upper surface 13B opposite the base plate 24 shown in Figure 3), and press the switching element 13 against the base plate 24.

[0038] Meanwhile, the heat sink portions 38 of each set of the fixing plate 6 are in surface contact with the upper surface 13B of each switching element 13. As a result, the heat sink portions 38 receive the heat generated by the switching elements 13, and transfer it to the base portion 33 and further to the base plate 24.

[0039] In this manner, the power module 14 is assembled. The power module 14 is then placed on the surface of the inverter control board 17 that faces the partition wall 12, with the sleeve 31 interposed between them (shown exploded in FIG. 7). At this point, the terminals 43 of each switching element 13 are soldered to the inverter control board 17. The power module 14 and inverter control board 17 thus integrated (assembled) are fixed to the housing 2 with screws 44 inserted through the sleeve 31.

[0040] The base plate 24 of the fixed power module 14 is in close contact with the partition wall 12 of the housing 2 in a heat exchange relationship. As a result, the base plate 24 and the housing 2 form a heat sink for the switching elements 13, so that heat from the switching elements 13 is transferred from the base plate 24 to the partition wall 12 of the housing 2, where the temperature becomes lower as described above.

[0041] As described above, the mounting device 28 for the switching element 13 of the present invention is provided with a metal fixing plate 26, and this fixing plate 26 is provided with first and second pressing plate portions 36, 37 (constituting the pressing portion) that abut against the upper surface of the switching element 13 opposite the base plate 24 (mounting portion) and press the switching element 13 against the base plate 24, and a heat sink portion 38 (constituting the heat sink) that receives the heat generated by the switching element 13 by making surface contact with the upper surface of the switching element 13 opposite the base plate 24.Therefore, the first and second pressing plate portions 36, 37 of the fixing plate 26 press the switching element 13 against the base plate 24, and the heat from the switching element 13 can be further received by the heat sink portion 38.

[0042] As a result, heat generated by the switching element 13 is transferred to both the base plate 24 and the heat dissipation plate portion 38 of the fixing plate 26, thereby improving the heat dissipation performance of the switching element 13. Furthermore, since the switching element 13 is pressed and fixed to the base plate 24 by the first and second pressing plate portions 36, 37 of the fixing plate 26, the distance from the screw 27 that screws into the housing 2 can also be secured.

[0043] That is, compared to when the switching element 13 is directly screwed in, it is possible to ensure an insulating distance from the underside 13A of the switching element 13, which becomes charged, and insulating performance is also improved. Furthermore, the pressing force of the first and second pressing plate portions 36, 37 can be adjusted by the amount of interference with the switching element 13 and the spring constant, so it is possible to easily deal with shrinkage of the resin of the switching element 13 due to heat, vibration, and external forces during installation.

[0044] As a result, the heat dissipation and insulation performance of the switching element 13 can be ensured overall, and the fixing quality and vibration resistance can be improved, as well as the ease of assembly, compared to when the switching element 13 is directly screwed in.

[0045] Furthermore, in the embodiment, the fixing plate 26 is provided with a base 33 for fixing the fixing plate 26 to the base plate 24, and as described above, the pressing portion is made up of first and second pressing plate portions 36, 37 which extend from mutually spaced positions of the base 33 in the direction of the switching element 13 and abut against both side portions of the switching element 13, and the heat dissipation portion is made up of a substantially T-shaped heat dissipation plate portion 38 which extends from the base 33 between the first and second pressing plate portions 36, 37 in the direction of the switching element 13 and then wraps around to the tip side of each pressing plate portion 36, 37. As a result, the switching element 13 is pressed down in three places, and damage to the switching element 13 by the fixing plate 26 is reduced.

[0046] In particular, the heat dissipation plate portion 38 is configured to be more flexible than the first and second pressing plate portions 36, 37, which allows the heat dissipation plate portion 38 to make good surface contact with the switching element 13, thereby further improving the heat dissipation performance.

[0047] Furthermore, in the embodiment, in order to attach multiple switching elements 13 arranged side by side to the base plate 24, multiple sets of first and second pressing plate portions 36, 37 and heat sink portion 38 are formed on the fixing plate 26, connected at the base 33, and each switching element 13 is attached to the base plate 24 in each set.In this case, a slit 29 is provided between the second pressing plate portion 27 and the first pressing plate portion 26 of adjacent sets, cutting from their tips toward the base 22.Therefore, even if there is variation in the thickness dimensions of adjacent switching elements 13, each switching element 13 can be stably attached to a single fixing plate 26.

[0048] Furthermore, by adopting a mounting device 28 for the switching element 13 in an electric compressor 1 having a housing 2 that constitutes a heat sink and a motor 6 that is provided within the housing 2 and driven by an inverter circuit section 3 as in the embodiment, the switching element 13 can be stably mounted on the electric compressor 1, and furthermore, the fixing plate 26 can smoothly transfer heat from the switching element 13 to the housing 2.

[0049] In this case, as in the embodiment, the mounting portion is formed by the base plate 24, the base 33 of the fixing plate 26 is screwed to the base plate 24, the switching element 13 is pressed against the base plate 24 by the first and second pressing plate portions 36, 37 of the fixing plate 26 via the insulating sheet 42, and the base plate 24 is arranged in a heat exchange relationship with the housing 2 to form a heat sink together with the housing 2. This makes it possible to mount the switching element 13 on the base plate 24 with the fixing plate 26 in an assembled state and then attach it to the electric compressor 1, thereby making it possible to further improve the ease of assembly.

[0050] Although the insulating sheet 42 described above actually has a wavy shape as shown in FIG. 3, the fixing plate 26 of the mounting device 28 of the present invention can effectively flatten this insulating sheet 42 and reduce the air layer, thereby further improving the heat dissipation performance of the switching element 13.

[0051] In addition, in the embodiment, the base plate 24 serves as the mounting portion, and the power module 14 and the inverter control board 17 are assembled and mounted to the housing 2, but this is not limiting. Alternatively, the partition wall 12 of the housing 2 may serve as the mounting surface, and the switching element 13 may be disposed on the partition wall 12 via the insulating sheet 42 and pressed against the partition wall 12 by the fixing plate 26. In this case, the fixing plate 26 may be fixed to the partition wall 12 or to another location.

[0052] Furthermore, in the embodiment, three switching elements 13 are attached to one fixing plate 26, but the inventions of claims 1 to 3 are not limited to this, and each switching element 13 may be attached to one fixing plate 26. In this case, the fixing plate 26 has one set of first and second pressing plate portions 36, 37 and a heat dissipation plate portion 38.

[0053] Furthermore, although the mounting device 28 of the present invention is applied to the electric compressor 1 in the embodiment, the invention is not limited to this in claims 1 to 4, and the present invention is effective for various devices in which the switching element 13 is mounted to a mounting portion. Furthermore, it goes without saying that the shapes and structures of the inverter circuit section 3, filter circuit section 4, and housing 2 shown in the embodiment are not limited thereto, and various changes can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0054] 1 Electric compressor 2 Housing (heat sink) 3 Inverter circuit section (inverter) 6 motors 8 Inverter housing 12 Bulkhead 13 Switching element 14 Power Module 16 Control circuit 17 Inverter control board 24 Base plate (mounting part, heat sink) 26 Fixed plate 27 screws 28 Mounting device 33 Base 36 First pressing plate portion (pressing portion) 37 Second pressing plate portion (pressing portion) 38 Heat sink (heat sink) 39 Slit 42 Insulation sheet

Claims

1. A mounting device for mounting a switching element of an inverter to a mounting portion constituting a heat sink, Equipped with a metal fixing plate, The fixing plate is a pressing portion that abuts against a surface of the switching element opposite to the mounting portion and presses the switching element against the mounting portion; a heat dissipation portion that receives heat generated by the switching element by being in surface contact with a surface of the switching element opposite to the mounting portion; A switching element mounting device comprising:

2. the fixing plate has a base for fixing the fixing plate to a predetermined location, the pressing portion includes first and second pressing plate portions extending from mutually spaced apart portions of the base toward the switching element and abutting against both side portions of the switching element, respectively; the heat dissipation portion is composed of a substantially T-shaped heat dissipation plate portion that extends from the base portion between the first and second pressing plate portions toward the switching elements and then wraps around to the tip sides of each pressing plate portion.

2. The switching element mounting device according to claim 1.

3. 3. The switching element mounting device according to claim 2, wherein the heat sink portion is configured to be more flexible than the first and second pressing plate portions.

4. The fixing plate has: A plurality of pairs of the first and second pressing plate portions and the heat dissipation plate portion are formed in a state where they are connected to the base portion, and a plurality of the switching elements arranged in parallel in each pair are attached to the attachment portion, 3. The switching element mounting device according to claim 2, wherein a slit is provided between the second pressing plate portion and the first pressing plate portion of each adjacent pair, the slit being cut from the tip of each plate portion toward the base portion.

5. 5. An electric compressor equipped with the switching element mounting device according to claim 1, further comprising: a housing constituting the heat sink; and a motor provided within the housing and driven by the inverter.

6. The mounting portion is a base plate, a base portion of the fixing plate is screwed to the base plate, the switching element is pressed against the base plate by a pressing portion of the fixing plate via an insulating sheet, and 6. The electric compressor according to claim 5, wherein the base plate is disposed in a heat exchange relationship with the housing, and together with the housing, constitutes the heat sink.

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