JP2022142594A - Power conversion device - Google Patents

Abstract

To provide a power conversion device in which improvement of the mounting density, improvement of the cooling performance, and vibration control of a capacitor and a capacitor terminal are all achieved.SOLUTION: A power conversion device includes a power module, a capacitor module, a case that houses the power module and the capacitor module, and a cover. The capacitor module includes a capacitor terminal that is electrically connected to the power module. On the upper surface of the capacitor module, a first recessed portion is formed on a first side on which the capacitor terminal is disposed while a second recessed portion is formed on a second side opposed to the first side. The cover is provided with a first projected portion that is fitted to the first recessed portion, and a second projected portion that is fitted to the second recessed portion. The upper surface excluding the first recessed portion and the second recessed portion, has a non-contact region that does not come into contact with the cover.SELECTED DRAWING: Figure 3

Description

The present invention relates to power converters.

2. Description of the Related Art In recent years, in industrial machines and vehicles (for example, automobiles and railroad vehicles), the electrification and electronic control of power sources are rapidly progressing from the viewpoint of energy saving and precise operation control. Along with this, the importance of improving power modules for controlling the power of the power source and electronic circuit devices for converting power using the power modules is increasing.

For example, a vehicle driving device has a function of driving a motor with electric power converted by a power conversion device. Common. Therefore, in order to expand the space inside the vehicle, it is desired to make the power conversion device thinner, and it is also desired to improve the cooling performance of the power conversion device.

Based on this point of view, as a background art of the present invention, the following patent document 1 discloses that a plate-shaped conductor connected to a semiconductor chip is thermally connected to both sides of the semiconductor chip, and heat can be emitted from both sides. and such that the conductor surfaces of the DC positive plate conductor and the DC negative plate conductor are opposed to each other. Thus, a technique is disclosed that can achieve both an improvement in cooling performance and a reduction in operating loss caused by wiring inductance.

JP 2007-299781 A

In the conventional structure described in Patent Literature 1, the structure is such that the flow path for cooling the semiconductor module is in contact with the smoothing capacitor. However, in order to further reduce the size and facilitate the mounting of mounted parts, it is necessary to simplify the connection structure of the smoothing capacitor terminals and the main circuit, and to reduce the number of fixed parts. Deterioration of fixation becomes an issue.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a power converter in which improvement in packaging density, improvement in cooling performance, and prevention of vibration of capacitors and capacitor terminals are achieved in parallel.

A power conversion device according to the present invention comprises: a power module for converting DC power into AC power; a capacitor module for smoothing the DC power; a case for housing the power module and the capacitor module; the capacitor module having a capacitor cell and a capacitor terminal extending from the capacitor cell and electrically connected to the power module; is the surface opposite to the surface in contact with the case, and on the upper surface, which is the surface facing the cover, a first concave portion is formed in the first side where the capacitor terminal is provided, and the capacitor cell is interposed between the capacitor cells. A second recess is formed on a second side facing the first side across the cover, and the cover includes a first protrusion fitted in the first recess and a first protrusion fitted in the second recess. A second convex portion is provided, and the surface of the upper surface other than the first concave portion and the second concave portion has a non-contact region that does not contact the cover.

According to the present invention, it is possible to provide a power conversion device in which improvement in packaging density, improvement in cooling performance, and prevention of vibration of capacitors and capacitor terminals are achieved in parallel.

1 is an electric circuit diagram of a power conversion device of the present invention; FIG. 1 is a perspective view of a capacitor module according to a first embodiment of the invention; FIG. 1 is a cross-sectional view of a capacitor module according to a first embodiment of the invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the power converter device which concerns on the 1st Embodiment of this invention. FIG. 5 is a top view of FIG. 4; FIG. 6 is a diagram illustrating a screw fastening portion around the capacitor module of FIG. 5; FIG. 5 is a cross-sectional view of a capacitor module according to a second embodiment of the invention; FIG. 10 is a cross-sectional view of a capacitor module according to a third embodiment of the invention; FIG. 10 is a cross-sectional view of a capacitor module according to a fourth embodiment of the invention; It is a top view of a power conversion device according to a fifth embodiment of the present invention. It is a sectional view of a power converter concerning a 6th embodiment of the present invention. FIG. 11 is a cross-sectional view of a capacitor module according to a seventh embodiment of the invention;

Embodiments of the present invention will be described below with reference to the drawings. The following description and drawings are examples for explaining the present invention, and are appropriately omitted and simplified for clarity of explanation. The present invention can also be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

The position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention. As such, the present invention is not necessarily limited to the locations, sizes, shapes, extents, etc., disclosed in the drawings.

(First embodiment and overall configuration of the present invention)
FIG. 1 is an electric circuit diagram of the power converter of the present invention.

The power conversion device is composed of an inverter 101 (including a control circuit 103) and a capacitor module 3, converts DC power supplied from a battery 100 mounted on a vehicle into AC power, and outputs the AC power to a motor 200. there is A capacitor module 3 connected in parallel with a battery 100 and an inverter 101 smoothes the DC power supplied from the battery 100 .

The inverter 101 includes three-phase sets 108 of one-leg power modules 104 (hereinafter referred to as power modules 104 ), which are semiconductor devices in which two semiconductor elements 23 are connected in series, and control circuits 103 . A set 108 of the power module 104 and the control circuit 103 is shown in detail for only one phase, and illustration of the other two phases is omitted.

The semiconductor elements 23 on the upper and lower arms of the power module 104 are switched between ON and OFF by control signals output from the control circuit 103 . A control signal output from the control circuit 103 is input to the semiconductor elements 23 of the upper and lower arms via the gate resistor 105 through the signal wiring.

The three-phase power modules 104 are connected in parallel to the high-voltage side input wiring 106 and the low-voltage side input wiring 107, respectively. The three-phase power module 104 is connected to the stator windings of each phase of the motor 200 at the intermediate points of the semiconductor devices 23 connected in series with the upper and lower arms. A three-phase set 108 including the power module 104 and the control circuit 103 outputs AC power to the motor 200 by switching between ON and OFF switching.

The semiconductor element 23 is composed of, for example, a combination of an IGBT (Insulated Gate Bipolar Transistor) and a diode, or a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor).

FIG. 2 is a perspective view of a capacitor module in the power converter according to the first embodiment of the invention. In the following description, the upper surface of the perspective view is the upper surface (first surface) of the capacitor module 3, and the lower surface thereof is the lower surface (second surface) of the capacitor module 3. FIG. For convenience of explanation, FIG. 2 shows a part of the case 6 that houses the power module 104 and the capacitor module 3, and omits the cover that is originally placed on the upper surface of the capacitor module 3. As shown in FIG.

In the electric circuit diagram of FIG. 1 , in each power module 104 of the inverter 101 , when the switching of the semiconductor element 23 is turned ON/OFF, the voltage fluctuates due to the steep current change. In order to suppress this, the rectangular capacitor module 3 shown in FIG. 2 absorbs the current flowing through the high-voltage side input wiring 106 and the low-voltage side input wiring 107, smoothes the DC power, and passes through these DC wirings. It has a function of passing a current to each power module 104 through the power module 104 .

A part of the high voltage side input wiring 106 and the low voltage side input wiring 107 connected to the capacitor module 3 corresponds to the capacitor terminal 1 extending from the capacitor module 3 in FIG. Capacitor terminal 1 protrudes outside from sealing resin 2 of capacitor module 3 and is connected to insulating substrate 12 (described later in FIG. 4) of power module 104 .

A concave portion 4 (first concave portion) is formed on one side of the first surface of the capacitor module 3 on which the capacitor terminal 1 is provided. Also, on the same first surface, a recess 5 (second recess) is formed on one side opposite to the recess 4 . The two recesses 4 and 5 have the same height from the second surface (from the case 6).

FIG. 3 is a cross-sectional view of the capacitor module 3 according to the first embodiment of the invention. Note that FIG. 3 shows a cross section of the capacitor module 3 , a cross section of the cover 7 attached to the first surface of the capacitor module 3 , and a cross section of the case 6 that houses the capacitor module 3 .

The first surface of the capacitor module 3 is the surface opposite to the surface (second surface) of the capacitor module 3 in contact with the case 6 and the upper surface facing the cover 7 . A capacitor cell 102 (hereinafter referred to as a capacitor 102 ) is provided inside the capacitor module 3 , and a capacitor terminal 1 extends from the capacitor 102 to the outside of the capacitor module 3 .

The capacitor module 3 is installed in the case 6 by the second surface of the capacitor module 3 coming into contact with the case 6 . The cover 7 has a convex portion 8 (first convex portion) and a convex portion 9 (second convex portion) that are fitted in contact with the concave portions 4 and 5 formed in the sealing resin 2 of the capacitor module 3, respectively. is provided. The recess 4 and the recess 5 are formed at positions facing each other with the capacitor 102 interposed therebetween.

The vicinity of the capacitor terminal 1 of the capacitor module 3 is pressurized by the convex portion 8 coming into contact with the concave portion 4 . In addition, since the convex portion 9 hits the concave portion 5, the two sides of both ends of the capacitor module 3 are pressed together with the pressure of the concave portion 4 by the convex portion 8, and pressure is applied to the entire first surface. As a result, the entire capacitor module 3 is pressed against the case 6, improving fixability.

Since the capacitor module 3 is in contact with the case 6 and the protrusions 8 and 9, the heat generated from the capacitor module 3 is transferred to the case 6 and transferred to the cover 7 via the protrusions 8 and 9 to dissipate the heat. It is a mechanism to be done. As a result, when the capacitor module 3 smoothes the direct current, it is possible to eliminate the concern that the capacitor 102 will be heated due to its own loss and reach a high temperature.

Non-contact region 10 is a region on the first surface of capacitor module 3 that does not come into contact with cover 7 except for recesses 4 and 5 . This area is a contact area in the conventional technology, but there is a possibility that the two protrusions 8 and 9 and the recesses 4 and 5 cannot contact each other depending on the contact situation. Therefore, in order to ensure contact between the projections 8, 9 and the recesses 4, 5, in the present invention, a non-contact region 10, which is an air layer, is provided in this region so that the projections 8, 9 and the recesses 4 are separated from each other. , 5 are prevented from being in contact with each other. By configuring the capacitor module 3 as described above, it is possible to contribute to a reduction in the number of fixing parts while maintaining the fixability, thereby contributing to miniaturization of the capacitor module and the power converter.

FIG. 4 is a cross-sectional view of the power converter according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of a power converter including the capacitor module 3 and the power module 104. As shown in FIG. The power module 104 is connected to an insulating substrate 12 having main circuit wiring (not shown) and an AC output wiring 19 for outputting power converted by the power module 104 to the outside. The case 6 is provided with a wiring cap 20 supporting the AC output wiring 19 .

A power module 104, which is a circuit body, includes a lead frame 13, wires 14a and 14b, a semiconductor element 23, and a sealing resin 15, and converts the DC power smoothed by the capacitor module 3 into AC power. .

The power module 104 is connected to the main circuit wiring of the insulating substrate 12 via wires 14a that connect to the leadframe 13 and wires 14b that connect to the semiconductor element 23 on the leadframe 13 .

The sealing resin 15 is a molding material that serves to seal the connection portions of the semiconductor element 23 , the lead frame 13 , the wires 14 a and 14 b and the insulating substrate 12 .

The capacitor terminal 1 is connected to the main circuit wiring of the insulating substrate 12 via solder (not shown). Thereby, the capacitor cells 102 in the capacitor module 3 and the power module 104 are electrically connected. Since this connection portion is not molded with the sealing resin 15 or the like, there is concern about its fixability. Fixability of the module 3 can be enhanced. With this configuration, even in a power conversion device mounted on a wheel of a vehicle, it is possible to suppress rotational stress applied to the connecting portion, and to prevent the connecting portion from being severed.

In addition, in order to eliminate the non-uniform adhesion caused by the dimensional difference between the projections 8, 9 and the recesses 4, 5 (see FIG. 2), the respective fitting portions of the projections 8, 9 and the recesses 4, 5 are Adhesion may be reinforced by interposing an adhesive material (heat radiation member) having stretchability and heat transfer properties between them. Similarly, the non-contact area 10 between the capacitor module 3 and the cover 7 may be reinforced with an elastic and heat-conducting adhesive material.

A channel forming body 17 is formed between the power module 104 and the case 6 . The lead frame 13 dissipates the heat generated by the semiconductor element 23 by thermally connecting the lead frame 13 to the flow path forming body 17 via the grease 16a, which is a heat conductive insulating layer. The flow path forming body 17 has a role of dissipating the heat generated by the power module 104 using the coolant 18 flowing inside.

Both ends of the case 6 and the cover 7 are in contact with each other, and the heat on the cover 7 side moves to the case 6 . The flow path forming body 17 has grease 16b, which is an adhesive having stretchability and heat conductivity, between the flow path forming body 17 and the case 6, and the heat transferred from the cover 7 to the case 6 is also cooled through this grease 16b. is doing.

5 is a top view of FIG. 4. FIG.

The capacitor terminals 1a to 1c of the plurality of capacitor modules 3a to 3c are arranged in a line inside the case 6. As shown in FIG. Among the three capacitor modules 3a to 3c, the central capacitor module 3b is surrounded on the left and right by the capacitor modules 3a and 3c. Although the details will be described later, at this time, if there is a dimensional difference between the central capacitor module 3b and the capacitor modules 3a and 3c, the protrusions formed on the cover 7 (not shown) come into contact with the recesses of the capacitor module 3b. 8 and 9 are used to make it easier for the protrusions to come into contact with the recesses of the central capacitor module 3b as much as possible.

FIG. 6 is a diagram for explaining a screw fastening portion around the capacitor module in FIG. 5. FIG.

In the semiconductor device 11, screw holes 21a to 21d, which are screw fastening portions, are formed in the corners of the case 6. As shown in FIG. How to determine the formation positions of the screw holes 21a to 21d will be described below.

First, from the center point of the capacitor module 3b, a dividing line 22a is defined in the horizontal direction of the paper, and a dividing line 22b is defined in the vertical direction of the paper. Furthermore, straight lines 24a and 24b are defined at positions equidistant from the dividing line 22a, and straight lines 24c and 24d are defined at positions equidistant from the dividing line 22b. Among the sides that are equidistant from the center positions of the respective capacitor modules 3a to 3c and are opposite to each other, the lateral side on which the capacitor terminals 1 are provided is the first side. A side is defined as a second side, and a vertical side perpendicular to the first side and the second side is defined as a third side and a fourth side, respectively. The straight lines 24a-24d are parallel to the first to fourth sides, respectively.

Recesses 4a-4c and recesses 5a-5c respectively formed in three capacitor modules 3a-3c are formed on straight lines 24a, 24b. In the capacitor modules 3a to 3c, if the thickness of the sealing resin 2 in the vertical direction of the paper from the respective center points is uniform, the widths of the recesses 4a to 4c and the recesses 5a to 5c in the vertical direction of the paper are equal. .

Next, straight lines 25a (first straight lines) and 25b (second straight lines) are placed at positions equidistant from the straight lines 24a and 24b, and straight lines 26a (third straight lines) are placed at positions equidistant from the straight lines 24c and 24d. straight line), 26b (fourth straight line). At this time, the straight lines 25 b , 26 a and 26 b are defined on the wall of the case 6 .

In case 6, screw holes 21a to 21d for fixing case 6 and cover 7 (not shown in FIG. 6) are provided at intersections formed by any two of the first to fourth straight lines. to form

A cover 7 fixed on the case 6 has projections 8 and 9 of a certain height contacting the recesses 4a to 4c and the recesses 5a to 5c formed in the three capacitor modules 3a to 3c, respectively. 6 is formed so as not to come into contact with the wall portion. Further, the cover 7 is provided with through holes at positions overlapping with the screw holes 21a to 21d so as to correspond to screw fastening of the screw holes 21a to 21d.

By doing so, when the case 6 and the cover 7 are screw-fastened through the screw holes 21a to 21d and the through-holes with a uniform fastening force, the force applied to the recess 4b and the recess 5b of the capacitor module 3b becomes equal, and the case When 6 and cover 7 are fixed, the fixability of capacitor module 3b is enhanced. In addition, along with this, the capacitor terminals 1a to 1c connected to the three capacitor modules 3a to 3c are prevented from vibrating, and the connecting portions between the capacitor terminals 1a to 1c and the insulating substrate 12 are prevented from breaking. Therefore, the stability and reliability of the power converter are improved.

It should be noted that the projections 8 and 9 provided on the cover 7 do not need to have a shape that is continuous, but are interrupted in the middle according to the shape, size, and position of the recesses 4a to 4c and the recesses 5a to 5c. It may be in the shape of

(Second embodiment)
FIG. 7 is a cross-sectional view of a capacitor module in a power converter according to a second embodiment of the invention. Note that the cross-sectional view of FIG. 7 is a cross-sectional view in which the dividing line 22a of FIG. 6 is broken.

In this embodiment, the capacitor modules 3a to 3c are formed by recesses 4a to 4c and recesses 5a to 5c provided on straight lines 24a and 24b (see FIG. 6) and projections provided on the cover 7 corresponding thereto. , and is fixed in response to the stress in the vertical direction of the paper surface of FIG. However, since there is a possibility that the capacitor modules 3a to 3c may be displaced or the connecting portions may be cut off due to vibrations in the horizontal direction of the paper surface, it is necessary to provide a structure for suppressing lateral vibrations.

A gap 27 is provided between each of the capacitor modules 3a to 3c, and a protrusion 28 (third protrusion) is further formed on the cover 7 in this embodiment so as to fit into the gap 27. As shown in FIG. The convex portion 28 has the same length as the sides of the capacitor modules 3a to 3c in the vertical direction in FIG. The convex portion 28 may have a shape that connects with the convex portions 8 and 9 formed in the horizontal direction in FIG. By doing so, the capacitor modules 3a to 3c can be prevented from vibrating in the lateral direction of the paper surface by the projections 28. FIG.

(Third Embodiment)
FIG. 8 is a cross-sectional view of a capacitor module according to a third embodiment of the invention. The cross-sectional view of the capacitor module 3B is a cross-sectional view taken along the straight line 24a in FIG.

FIG. 8 shows that, in the capacitor modules 3a to 3c, for example, due to deformation of the cover 7, the projection 8 (9) is poorly fitted to the capacitor module 3b in the center, and in order to prevent a case where force is not applied, the center The height (the length of the protrusion) of the protrusion 8b corresponding to the capacitor module 3b is formed to be greater than the height of the protrusions 8a of the capacitor modules 3a and 3c.

As a result, the concave portion 4b of the central capacitor module 3b corresponding to the convex portion 8b is fitted, but the convex portion 8a is not completely fitted into the concave portions 4a and 4c of the capacitor modules 3a and 3c. In this state, when the cover 7 is fastened to the case 6 by screwing or the like, the cover 7 is deformed around the convex portion 8b. narrow and come into contact. By doing so, the fixability of all the capacitor modules 3a to 3c is enhanced while the central capacitor module 3b is fixed more strongly.

(Fourth embodiment)
FIG. 9 is a cross-sectional view of a capacitor module according to a fourth embodiment of the invention.

In this embodiment, the recesses of capacitor modules 3a and 3c are formed deeper than recesses 4 of capacitor module 3b, like recesses 4d and 4e. In other words, the depth of the recess of centrally arranged capacitor module 3b is smaller than the depth of recesses 4d and 4e of capacitor modules 3a and 3c, respectively.

By doing so, similarly to the third embodiment (FIG. 8), when the cover 7 is fastened to the case 6, the cover 7 is deformed around the convex portion fitted to the concave portion of the capacitor module 3b. . Therefore, the distance between the convex portion 8 and the concave portions 4d and 4e, which are not completely fitted, is narrowed and brought into contact with each other, so that the central capacitor module 3b is more firmly fixed, and the fixability of all the capacitor modules 3a to 3c is enhanced.

In the example shown in FIGS. 8 and 9, the case of the three capacitor modules 3a to 3c has been described, but the invention is not limited to this, and the number of the capacitor modules 3 is not limited to three, and an odd number of capacitor modules 3 are arranged in parallel. A similar effect can be achieved with the form in which they are arranged.

(Fifth embodiment)
FIG. 10 is a top view of a power conversion device according to a fifth embodiment of the present invention.

A difference between this embodiment and the first embodiment shown in FIG. It is the point where it is arranged. In the capacitor module 3d, a concave portion 4f is provided on the side from which the capacitor terminal 1d protrudes, and a concave portion 5f is provided on the opposite side. The concave portions 4f and 5f are formed in a direction perpendicular to the concave portions 4a to 4c and the concave portions 5a to 5c, and the cover 7 is provided with convex portions so as to fit and contact the concave portions 4f and 5f. By doing so, it is possible to suppress the vibration of the capacitor terminals 1d connected to the insulating substrate 12 in different directions in the case 6, thereby improving the stability of the capacitor module 3d.

(Sixth embodiment)
FIG. 11 is a cross-sectional view of a power converter according to the sixth embodiment.

The difference between this embodiment and the embodiment shown in the power conversion apparatus of FIG. It is thermally connected to the newly provided flow path forming body 17b through the grease 16c which is an insulating layer. The power module 104E is cooled from both sides by the coolant 18 flowing inside the passage forming body 17b.

Further, elastic heat radiation members 29 are provided between the flow path forming body 17b and the capacitor module 3E and the cover 7, respectively. As a result, it is possible to improve the heat radiation performance from the capacitor module 3 to the flow path forming body 17b through the cover 7 while maintaining the contact between the cover 7 and the capacitor module 3 of the capacitor module 3E.

(Seventh embodiment)
FIG. 12 is a cross-sectional view of a capacitor module according to a seventh embodiment;

The difference between the capacitor module 3F of this embodiment and the capacitor module 3 of FIG. 3 is that the capacitor 102 is divided into two with the same dimensions inside the capacitor module 3F. Furthermore, between the two capacitors 102, a median line 30 is defined that is parallel to the surfaces facing each other and is equidistant from each other. A second concave portion 5F and a second convex portion 9F are formed.

Thus, when a plurality of capacitors 102 serve for one phase of the capacitor module 3F, the capacitor module 3F is fixed by the projections 8 and 9F of the cover 7 not at both ends of the capacitor module 3F, but between the capacitors 102. Stability can be enhanced by fixing the capacitor module 3F (in the middle of the capacitor module 3F) by fitting the convex portion 9F and the concave portion. Moreover, the number of options for fixing the capacitor module 3F to the case 6 (formation of the convex portion 9F provided on the cover 7) is increased.

According to the first to seventh embodiments of the present invention described above, the following effects are obtained.

(1) The power converter includes a power module 104 that converts DC power into AC power, a capacitor module 3 that smoothes the DC power, a case 6 that houses the power module 104 and the capacitor module 3, and a and a cover 7 fixed to the . The capacitor module 3 has a capacitor cell 102 and a capacitor terminal 1 extending from the capacitor cell 102 and electrically connected to the power module 104 . On the top surface, which is the surface opposite to the surface facing the cover 7 and the surface facing the cover 7, the first recess 4 is formed on the first side where the capacitor terminal 1 is provided, and the capacitor cell 102 is sandwiched between the first recesses 4. A second recess 5 is formed on a second side facing the first side, and the cover 7 includes a first protrusion 8 that fits into the first recess 4 and a second protrusion that fits into the second recess 5 . A portion 9 is provided, and the surface other than the first concave portion 4 and the second concave portion 5 on the upper surface has a non-contact area 10 that does not contact the cover 7 . By doing so, it is possible to provide a power conversion device in which improvement in mounting density, improvement in cooling performance, and prevention of vibration of the capacitor 102 and the capacitor terminal 1 are achieved in parallel.

(2) Each capacitor terminal 1 of a plurality of capacitor modules 3a to 3c possessed by the power conversion device is arranged in a line, the capacitor modules 3a to 3c are rectangular, and the center position of each capacitor module 3a to 3c, etc. There are provided a first side 24a and a second side 24b that are separated from each other and face each other, and a third side 24c and a fourth side 24d that are perpendicular to the first side 24a and the second side 24b. Furthermore, straight lines that are parallel and equidistant from the first side 24a and the second side 24b, respectively, are drawn from the first straight line 25a and the second straight line 25b, and from the third side 24c and the fourth side 24d, parallel and at a predetermined distance. Equidistant straight lines are defined as a third straight line 26a and a fourth straight line 26b. Among these straight lines, the second straight line 25b, the third straight line 26a and the fourth straight line 26b are on the wall of the case 6 and formed by any two of the first straight line 25a to the fourth straight line 26b. A screw fastening portion for fixing the case 6 and the cover 7 is formed on the intersection of the two. By doing so, the fixability of the capacitor modules 3a to 3c is enhanced.

(3) A plurality of capacitor modules 3a to 3c of the power conversion device are arranged in a line, and the cover 7 is provided with a third protrusion 28 that fits into the gap 27 of each of the capacitor modules 3a to 3c. ing. By doing so, it is possible to provide a power conversion device that has anti-vibration measures against not only vertical shaking but also horizontal shaking.

(4) When an odd number of three or more capacitor modules 3 are arranged in a row, the first convex portion 8b and the second convex portion 8b of the central capacitor module 3b arranged in the center of the arrangement in the parallel direction The height of each portion is greater than the height of each of the first convex portion 8 and the second convex portion 9 of the capacitor modules 3 other than the central capacitor module 3b. By doing so, the fixability of all the capacitor modules 3 installed in the case 6 is enhanced while the central capacitor module 3b is fixed more strongly.

(5) When an odd number of three or more capacitor modules 3 are arranged in a row, each of the first recess and the second recess of the central capacitor module 3b arranged in the center of the arrangement in the parallel direction is smaller than the depth of each of the first recesses 4d and 4e and the second recesses of the capacitor modules 3 other than the central capacitor module 3b. By doing so, the fixability of all the capacitor modules 3 installed in the case 6 is enhanced while the central capacitor module 3b is fixed more strongly.

(6) A first flow path forming body 17 is formed between the power module 104 and the case 6 . By doing so, the heat transferred from the power module 104 can be radiated.

(7) Between the first flow path forming body 17 and the case 6, a stretchable heat radiating member 16b is provided. By doing so, the heat transferred from the case 6 can be dissipated.

(8) A second flow path forming body 17b is formed between the power module 104E and the cover 7 . By doing so, the heat transmitted from the power module 104 can be radiated by the flow path forming bodies 17a and 17b provided on both sides thereof.

(9) A stretchable heat radiating member 29 is provided between the second flow path forming body 17b and the cover 7 . By doing so, the heat transferred from the cover 7 can be radiated.

(10) The non-contact area 10 is provided with a stretchable heat dissipation member 29 . By doing so, the heat transmitted from the capacitor module 3E can be transmitted to the flow path forming body 17b through the cover 7 and radiated.

(11) Heat conductive insulating layers 16a and 16c are provided between the power module 104E and the first flow path forming body 17a. By doing in this way, the power module 104E can be cooled by the 1st flow-path formation body 17a.

(12) Heat conductive insulating layers 16a and 16c are provided between the power module 104E and the first flow path forming body 17a and the second flow path forming body 17b, respectively. By doing so, the power module 104E can be double-sided cooled by the first flow path forming body 17a and the second flow path forming body 17b.

(13) A stretchable heat dissipation member (adhesive) is provided between the first concave portion and the first convex portion and between the second concave portion and the second convex portion, respectively. By doing so, the adhesion between the cover 7 and the capacitor module 3 can be reinforced.

(14) The capacitor module 3F has two capacitor cells 102 of the same size inside, and between the two capacitor cells 102, the respective capacitor cells 102 are parallel to the facing surfaces and at a predetermined equal distance. A midline 30 is defined, and the second recess 5F is formed on the midline 30 in the capacitor module 3F. By doing so, the options for fixing the capacitor module 3F are increased, and design requirements can be met.

(15) A separate capacitor module 3d having a third recess 4f and a fourth recess 5f formed in a direction perpendicular to the first recesses 4a to 4c and the second recesses 5a to 5c is provided in the case 6. ing. By doing so, even if there is a capacitor module 3d that is separately mounted in a different direction, the vibration of the capacitor terminal 3d connected to the insulating substrate 12 is suppressed, and the stability of the capacitor module 1d is improved. is ensured.

The present invention is not limited to the above-described embodiments, and various modifications and other configurations can be combined without departing from the scope of the invention. Moreover, the present invention is not limited to those having all the configurations described in the above embodiments, and includes those having some of the configurations omitted.

1: Capacitor terminal 2: Sealing resin (capacitor module)
3, 3a to 3d, 3A to 3F Capacitor modules 4, 4a, 4b, 4c, 4d, 4e (first) recess 4f (third) recess 5, 5a, 5b, 5c (Second) concave portion 5f (fourth) concave portion 6 case 7 cover 8, 8a, 8b (first) convex portion 9 (second) convex portion Reference Signs List 10 Non-contact area 12 Insulating substrate 13 Lead frames 14a, 14b Wires 15 Sealing resin (power module)
16a, 16b, 16c Grease 17, 17a, 17b Flow path forming body 18 Refrigerant 19 AC output wiring 20 Wiring caps 21a, 21b, 21c, 21d Screws Holes 22a, 22b Dividing line 23 Semiconductor element 24a Straight line (first side)
24b... straight line (second side)
24c... straight line (third side)
24d... straight line (fourth side)
25a First straight line 25b Second straight line 26a Third straight line 26b Fourth straight line 27 Gap 28 (third) projection 29 Heat dissipation member 30 ... Middle line 102 ... Capacitor cells 104, 104E ... 1 leg power module

Claims (15)

a power module that converts DC power into AC power;
a capacitor module that smoothes the DC power;
a case that houses the power module and the capacitor module;
a cover fixed on the case,
The capacitor module is
a capacitor cell;
a capacitor terminal extending from the capacitor cell and electrically connected to the power module;
In the capacitor module, the upper surface, which is the surface opposite to the surface in contact with the case and faces the cover, has a first recess on the first side where the capacitor terminals are provided. a second recess is formed in a second side facing the first side with the capacitor cell interposed therebetween;
The cover is provided with a first protrusion that fits into the first recess and a second protrusion that fits into the second recess,
In the upper surface, a surface other than the first recess and the second recess has a non-contact region that does not contact the cover. Power conversion device. The power converter according to claim 1,
Having a plurality of the capacitor modules,
the plurality of capacitor modules are arranged in a row,
The capacitor module has a rectangular shape, and the first side and the second side are equidistant from the center position of each capacitor module and face each other, and the first side and the second side are in contact with each other at right angles. a third side and a fourth side are provided,
A straight line that is parallel and equidistant from the first side and the second side is a straight line that is parallel and equidistant from the first side and the second side, and a straight line is parallel and equidistant from the third side and the fourth side. If the straight lines are defined as the 3rd straight line and the 4th straight line,
the second straight line, the third straight line and the fourth straight line are on the wall of the case;
A power conversion device, wherein a screw fastening portion for fixing the case and the cover is formed on an intersection formed by any two of the first straight line to the fourth straight line. The power converter according to claim 1,
Having a plurality of the plurality of capacitor modules,
the plurality of capacitor modules are arranged in a row,
The power conversion device, wherein the cover is provided with a third projection that fits into the gap of each of the capacitor modules. The power converter according to claim 1,
When an odd number of three or more of the capacitor modules are arranged in a row,
In the arrangement in the parallel direction, the heights of the first protrusions and the second protrusions of the central capacitor module arranged in the center are equal to the heights of the first protrusions of the capacitor modules other than the central capacitor module. and greater than the height of each of the second protrusions. The power converter according to claim 1,
When an odd number of three or more of the capacitor modules are arranged in a row,
In the arrangement in the parallel direction, the depths of the first recesses and the second recesses of the central capacitor module arranged in the center are the same as the depths of the first recesses and the second recesses of the capacitor modules other than the central capacitor module. A power conversion device that is smaller than the depth of each of the two recesses. The power converter according to claim 1,
A power conversion device, wherein a first flow path forming body is formed between the power module and the case. The power converter according to claim 6,
A power conversion device, wherein a stretchable heat dissipation member is provided between the first flow path forming body and the case. The power converter according to claim 6,
A power conversion device, wherein a heat conductive insulating layer is provided between the power module and the first flow path forming body. The power converter according to claim 6,
A power conversion device, wherein a second flow path forming body is formed between the power module and the cover. The power converter according to claim 9,
A power conversion device, wherein a stretchable heat dissipation member is provided between the second flow path forming body and the cover. The power converter according to claim 9,
A power conversion device, wherein a heat conductive insulating layer is provided between the power module and the first flow path forming body and the second flow path forming body, respectively. The power converter according to claim 1,
The power conversion device, wherein the non-contact area is provided with a stretchable heat dissipation member. The power converter according to claim 1,
A power conversion device, wherein a stretchable heat dissipation member is provided between the first concave portion and the first convex portion and between the second concave portion and the second convex portion. The power converter according to claim 1,
the capacitor module includes two of the capacitor cells therein;
defining a median line between two of the capacitor cells that is parallel to the planes of the capacitor cells facing each other and is a predetermined equidistant distance;
The power conversion device, wherein the second recess is formed on the midline in the capacitor module. The power converter according to claim 1,
A power converter comprising the separate capacitor module having a third recess and a fourth recess formed in a direction perpendicular to the first recess and the second recess.

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