Power conversion device

Abstract

The power conversion device (1) has: a capacitor (12) having a columnar main body (10) and a plurality of terminals (11) provided at one end surface of the main body (10); a first substrate (5) having a mounting surface provided with a plurality of terminal seats each connected to the terminals (11); and a first cover (2) covering the mounting surface and having a recess (13) formed in a surface (2b) opposite to a surface of the first cover (2) facing the first substrate (5) side for insertion of the capacitor (12) in a posture in which one end surface of the capacitor (12) is perpendicular to the mounting surface. If the capacitor (12) is inserted into the recess (13) while the mounting surface is covered by the first cover (2), the terminals (11) are connected to the terminal seats.

Description

Technical Field

[0001] This invention relates to a power conversion device having a capacitor. Background Technology

[0002] Power conversion devices that convert AC voltage to DC voltage or vice versa include capacitors. In power conversion devices, capacitors are sometimes replaced depending on the duration of use, etc. To facilitate capacitor replacement in power conversion devices, as disclosed in Patent Document 1, a technique is used to facilitate capacitor replacement by housing the capacitor inside a capacitor casing.

[0003] Patent Document 1: Japanese Patent No. 3430185 Summary of the Invention

[0004] In the power conversion device disclosed in Patent Document 1, when replacing a capacitor, it is necessary to pull the capacitor out of the enclosure and insert the new capacitor into the enclosure. The power conversion device is mounted on a surface such as a wall. In the power conversion device disclosed in Patent Document 1, the direction in which the capacitor is pulled out of the enclosure is parallel to the surface. In most cases, other devices are also installed on the surface where the power conversion device is mounted. When the distance between the power conversion device and other devices installed around it is close, the other devices become obstructions, making it impossible to pull out the capacitor and replace it while the power conversion device is mounted on the surface. In such cases, the power conversion device must be removed or the enclosure must be removed from the power conversion device to replace the capacitor, resulting in increased work time for the replacement operation.

[0005] On the other hand, by ensuring sufficient distance between the power conversion device and other devices, the installation space for the power conversion device and the like becomes larger.

[0006] The present invention was made in view of the above-mentioned problems, and its purpose is to provide a power conversion device that can improve workability when replacing capacitors and save space in terms of installation space.

[0007] To solve the above-mentioned problems and achieve the objectives, the power conversion device of the present invention has the following features:

[0008] A capacitor has a columnar body and a plurality of terminals disposed on one end face of the body; a first substrate having a mounting surface having a plurality of terminal blocks, each terminal block being connected to a terminal; and a first cover covering the mounting surface, and having a recess formed on the opposite side of the side of the first cover facing the first substrate for inserting the capacitor in an orientation where one end face is perpendicular to the mounting surface. When the mounting surface is covered by the first cover, if the capacitor is inserted into the recess, the terminals are connected to the terminal blocks.

[0009] The effects of the invention

[0010] According to the present invention, the following effects are achieved: a power conversion device that improves workability when replacing capacitors and saves installation space is obtained. Attached Figure Description

[0011] Figure 1 This is a front view of the power conversion device according to Embodiment 1 of the present invention.

[0012] Figure 2 This is a perspective view of the power conversion device according to Embodiment 1.

[0013] Figure 3 This is a cross-sectional view of the power conversion device according to Embodiment 1, along... Figure 1 The cross-sectional view along line III-III shown.

[0014] Figure 4 This is a cross-sectional view of the power conversion device according to Embodiment 1, along... Figure 1 The cross-sectional view of line IV-IV shown.

[0015] Figure 5 This is a perspective view showing the state in Embodiment 1 where the first substrate is placed on the base.

[0016] Figure 6 This is an exploded perspective view showing the state of the power conversion device according to Embodiment 1 after the second cover has been removed.

[0017] Figure 7 This is a perspective view of the capacitor in Embodiment 1.

[0018] Figure 8 This is a partial enlarged perspective view of Embodiment 1, showing the enlarged recessed portion formed in the first cover.

[0019] Figure 9 This diagram shows the state after the capacitor is inserted into the recess in Embodiment 1.

[0020] Figure 10 This is a diagram showing the state after the capacitor is fixed in Embodiment 1.

[0021] Figure 11 This is a side view showing the state after the capacitor of Embodiment 1 has been inserted into the recess, and the figure shows the first cover omitted.

[0022] Figure 12 This is a diagram showing the capacitor and terminal block involved in the modified example 1 of embodiment 1 as viewed from one end face.

[0023] Figure 13This is a diagram showing the capacitor and terminal block involved in Modification 2 of Embodiment 1 viewed from one end face.

[0024] Figure 14 This is a diagram showing the capacitor and terminal block involved in Modification 3 of Embodiment 1 viewed from one end face.

[0025] Figure 15 This is a diagram showing the capacitor and terminal block involved in Modification 4 of Embodiment 1 viewed from the front.

[0026] Figure 16 This is a partial enlarged perspective view of the exposed portion of the first cover involved in Variation 5 of Embodiment 1.

[0027] Figure 17 It means in Figure 16 The diagram shows a state where a sheet metal part is embedded in the exposed portion.

[0028] Figure 18 This diagram shows the state after capacitors are connected in parallel using sheet metal parts in variation 5.

[0029] Figure 19 This diagram shows the state after capacitors are connected in series using sheet metal parts in variation 5.

[0030] Figure 20 This is a perspective view of the first sheet metal part in variation example 5.

[0031] Figure 21 This is a perspective view of the second sheet metal part in variation example 5.

[0032] Figure 22 This is a perspective view of the third sheet metal part in variation example 5. Detailed Implementation

[0033] Hereinafter, the power conversion device according to embodiments of the present invention will be described in detail based on the accompanying drawings.

[0034] Implementation Method 1

[0035] Figure 1 This is a front view of the power conversion device according to Embodiment 1 of the present invention. Figure 2 This is a perspective view of the power conversion device according to Embodiment 1 of the present invention. Figure 3 This is a cross-sectional view of the power conversion device according to Embodiment 1, along... Figure 1 The cross-sectional view along line III-III shown. Figure 4 This is a cross-sectional view of the power conversion device according to Embodiment 1, along... Figure 1The cross-sectional view along line IV-IV is shown. The power conversion device 1 includes a base 6, a first substrate 5, a frame 4, a capacitor 12, and a second substrate 7. The base 6 serves as a platform for mounting the first substrate 5. In addition, the base 6 also functions as a heat sink to dissipate heat generated by the power conversion device 1.

[0036] Figure 5 This is a perspective view showing the state in Embodiment 1 where the first substrate is mounted on the base. The first substrate 5 has a mounting surface 5a on which a plurality of terminal blocks 8 are mounted. The first substrate 5 is mounted on the base 6 with the mounting surface 5a facing away from the base 6. The plurality of terminal blocks 8 are formed to protrude from the mounting surface 5a. The protrusion height of the plurality of terminal blocks 8 measured from the mounting surface 5a is equal.

[0037] Terminal block 8 is a rigid body formed by bending a metal plate into a U-shape, with its open end fixed to the first substrate 5. The bent portion of terminal block 8 becomes a flat surface, and a screw hole 8a is formed on this flat surface. A thread is formed inside the screw hole 8a, allowing a screw to be screwed in.

[0038] In addition to the terminal block 8, electronic components (not shown) are also mounted on the mounting surface 5a of the first substrate 5. The electronic components mounted on the first substrate 5 constitute converters and inverters, etc. Furthermore, in the following description, the direction towards the base 6 in the normal direction of the mounting surface 5a is referred to as rearward, and the opposite direction is referred to as frontward. Additionally, the direction perpendicular to the rearward direction is referred to as lateral. However, this definition of direction is not intended to limit the installation orientation of the power conversion device 1.

[0039] The frame 4 has a first cover 2 and a second cover 3, which form the outer contour of the power conversion device 1. The first cover 2 covers the mounting surface 5a of the first substrate 5. The first cover 2 and the base 6 are fixed by engaging a fixing pin (not shown) formed in one and a recess formed in the other.

[0040] Figure 6 This is an exploded perspective view showing the state after the second cover of the power conversion device according to Embodiment 1 has been removed. A recess 13 is formed on the side 2b opposite to the mounting surface 5a of the first substrate 5 in the first cover 2, recessed toward the mounting surface 5a. A capacitor 12 is inserted into the recess 13.

[0041] like Figure 3 As shown, the first cover 2 has an exposed portion 2a that exposes the terminal block 8 from the recess 13. The exposed portion 2a is exemplified as a hole that passes through the surface of the first cover 2 facing the mounting surface 5a and the opposite surface 2b, but it is not limited to this. It can also be a cut that is cut from the edge to expose the terminal block 8.

[0042] Figure 7This is a perspective view of the capacitor in Embodiment 1. The capacitor 12 has a main body 10 and a plurality of terminals 11. The main body 10 is cylindrical in shape, and a cylindrical shape is illustrated in this Embodiment 1. The plurality of terminals 11 are provided on one end face 14 of the main body 10. The terminals 11 are formed by bending a metal plate into an L-shape, with one side of the terminal 11 relative to the bent portion fixed to one end face 14 of the main body 10, and the other side protruding from one end face 14. A through hole 11a is formed in the portion of the terminal 11 that protrudes from one end face 14.

[0043] The capacitor 12 is inserted into the recess 13 formed in the first cover 2 with one end face 14 of the main body 10 perpendicular to the mounting surface 5a of the first substrate 5. In addition, the insertion direction of the capacitor 12 into the recess 13 formed on the opposite side 2b of the first cover 2 is a direction perpendicular to the mounting surface 5a, that is, a front-back direction.

[0044] Here, the recess 13 is formed to match the shape of the capacitor 12. In particular, the portion into which the body 10 of the capacitor 12 is inserted is formed to abut against the side of the body 10 and be supported from the base 6 side.

[0045] Figure 8 This is a magnified oblique view of the recessed portion formed in the first cover in Embodiment 1. As shown in Embodiment 1, if the main body 10 is cylindrical, the cross-sectional shape of the bottom of the recess 13 is as follows: Figure 4 and Figure 8 It is formed into an arc-shaped surface as shown. In addition, a hole 16 is formed at the bottom of the recess 13. Furthermore, a groove 17 is formed at the bottom of the recess 13, extending from the edge 16a of the hole 16 to the edge 13a of the recess 13.

[0046] Figure 9 This diagram shows the state after the capacitor is inserted into the recess in Embodiment 1. Figure 10 This is a diagram showing the state after the capacitor is fixed in Embodiment 1. Figure 11 This is a side view showing the state after the capacitor of Embodiment 1 has been inserted into the recess, and the figure shows the first cover omitted.

[0047] like Figure 9 and Figure 11 As shown, the plurality of terminals 11 of the capacitor 12 inserted into the recess 13 each overlap with the terminal base 8 exposed through the exposed portion 2a from the recess 13. If the terminal 11 overlaps with the terminal base 8, the through hole 11a formed by the terminal 11 and the terminal base 8 overlaps with the screw hole 8a. In this state, as Figure 10As shown, the terminal 11 and the terminal block 8 are secured by screwing the screw 15 into the screw hole 8a in the front direction. Thus, the capacitor 12 is electrically connected to the circuit formed on the first substrate 5 and the electronic components mounted on the first substrate 5 via the terminal 11 and the terminal block 8. Furthermore, the overlapping of the terminal 11 and the terminal block 8 includes not only the case where the terminal 11 and the terminal block 8 are in contact, but also the case where the terminal 11 and the terminal block 8 overlap when viewed in the front-rear direction without contacting each other.

[0048] return Figures 1 to 4 The second cover 3 is disposed on the opposite side 2b of the first cover 2. The second cover 3 has a plate portion 24 and an abutment portion 25. The plate portion 24 is a plate-shaped component that covers the recess 13. The abutment portion 25 is formed to protrude toward the recess 13 while covering it. The abutment portion 25 penetrates the recess 13 while covering it and abuts against the body 10 of the capacitor 12. The abutment portion 25 abuts against the body 10, thereby clamping and fixing the capacitor 12 between the first cover 2 and the second cover 3. Furthermore, if the depth of the recess 13 is equal to the diameter of the body 10 of the capacitor 12, the plate portion 24 can abut against the body 10 even without the abutment portion 25. In addition, as for the capacitor 12, the terminals 11 and the terminal base 8 are fastened with screws 15, so the capacitor 12 can be prevented from falling off even without the second cover 3.

[0049] The second substrate 7 is mounted on the side of the second cover 3 opposite to the side where the contact portion 25 is formed. The second substrate 7 is a control substrate for mounting electronic components (not shown) and forming circuits to control the converter and inverter constructed on the first substrate 5. In the power conversion device 1, by controlling the converter and inverter, conversions from AC voltage to DC voltage and from DC voltage to AC voltage are performed.

[0050] The power conversion device 1 is used by mounting it on a wall or other mounting surface. The power conversion device 1 is mounted with the rearward-facing side of the base 6 opposite to the side on which the first substrate 5 is mounted. When the power conversion device 1 is mounted on the mounting surface, the axial direction of the mounting surface 5a of the first substrate 5 and the main body 10 of the capacitor 12 is parallel to the mounting surface, and one end face 14 of the main body 10 is perpendicular to the mounting surface.

[0051] Regarding the power conversion device 1, the capacitor 12 is replaced according to the period of use after it is installed on the mounting surface. When replacing the capacitor 12, it is necessary to remove the capacitor 12 from the frame 4 and install the new capacitor 12 into the frame 4.

[0052] In the power conversion device 1 according to Embodiment 1, the capacitor 12 can be installed or removed from the first cover 2 by inserting it into or pulling it out of the recess 13 in the front-back direction. Therefore, when replacing the capacitor 12, the second cover 3 is removed first. Next, the screw 15 screwed into the terminal block 8 is removed, and the capacitor 12 is pulled forward from the recess 13. Then, a new capacitor 12 is inserted into the recess 13, and the second cover 3 is installed.

[0053] Here, other devices besides the power conversion device 1 are also provided on the mounting surface where the power conversion device 1 is installed. Therefore, sometimes other devices are arranged to the side of the power conversion device 1. Even in such cases, with respect to the power conversion device 1 according to Embodiment 1, when replacing the capacitor 12, it can be completed simply by moving the second cover 3 to be removed and the capacitor 12 in the forward and backward direction, so other devices arranged to the side of the power conversion device 1 will not be an obstacle.

[0054] For example, for power conversion devices that require the capacitor to be pulled out to the side, if other devices are installed on the side, the capacitor can only be pulled out by removing the power conversion device itself, which increases the time required for replacement. In addition, in order to replace the capacitor without removing the power conversion device itself, a large space needs to be ensured on the side of the power conversion device, thus increasing the installation space for the power conversion device.

[0055] On the other hand, in the power conversion device 1 according to Embodiment 1, as described above, the capacitor 12 can be replaced by moving the second cover 3 and the capacitor 12 in the forward and backward direction. Therefore, even if other devices are provided on the side, the capacitor 12 can be replaced without removing the power conversion device 1 itself. In addition, since it is not necessary to ensure space for capacitor replacement on the side of the power conversion device 1, space saving of the installation space can be achieved.

[0056] Furthermore, the capacitor 12 can be installed and removed by moving it in the front-back direction, thus allowing other components to be arranged to the side of the capacitor 12, increasing the freedom of arrangement for these components. However, when the capacitor 12 is pulled out to the side, components cannot be arranged on the mounting surface 5a along the path along which it is pulled out. Therefore, the space available for arranging components on the mounting surface 5a is reduced. On the other hand, in the power conversion device 1 according to Embodiment 1, the capacitor 12 is pulled out in the front-back direction, thus increasing the space available for arranging components on the mounting surface 5a compared to the case of pulling it out to the side. This allows for increased component mounting density on the mounting surface 5a, enabling miniaturization of the first substrate 5.

[0057] Furthermore, when the capacitor 12 is inserted into the recess 13, the terminal block 8 is exposed at the position where it overlaps with the terminal 11. Therefore, alignment for connecting the terminal 11 and the terminal block 8 is not required, improving workability. Additionally, by screwing the screw 15 into the screw hole 8a formed in the terminal block 8, the connection between the terminal 11 and the terminal block 8 is secured, thus firmly maintaining the connection. Therefore, the connection between the terminal 11 and the terminal block 8 is less likely to break due to vibration or impact.

[0058] Furthermore, since the terminal 11 of the capacitor 12 is directly connected to the terminal block 8 provided on the mounting surface 5a of the first substrate 5, the connection path from the capacitor 12 to the first substrate 5 can be shortened. This reduces the likelihood of electrical noise generation and susceptibility to its effects. Generally, a longer electrical connection path increases the intensity of electrical noise radiated to the surroundings. This can potentially cause malfunctions in other electronic devices located nearby, necessitating separate installation from other electronic devices. On the other hand, in this embodiment 1, as described above, the connection path from the capacitor 12 to the first substrate 5 is shortened, thus suppressing the intensity of electrical noise radiated to the surroundings, allowing other electronic devices to be placed near the power conversion device 1.

[0059] Furthermore, the terminal block 8 provided on the mounting surface 5a of the first substrate 5 is a rigid body formed by bending a metal plate into a U-shape. That is, the connection between the capacitor 12 and the first substrate 5 does not use a flexible material such as a wire harness. When assembling devices that use flexible materials such as wire harnesses by a robot, a large number of sensor installations and positioning operations during component preparation are required. Therefore, if it is possible to assemble devices that use wire harnesses by a robot, there are concerns about increased equipment costs and increased work hours. On the other hand, in the power conversion device 1 according to Embodiment 1, as described above, the connection between the capacitor 12 and the first substrate 5 does not use a flexible material such as a wire harness, so it can be assembled by an automated machine such as a robot, thereby improving productivity.

[0060] Furthermore, since the terminal 11, formed of a metal plate, is connected to the flat surface of the terminal block 8, the contact area is increased, and the contact resistance is suppressed. Additionally, the electrothermal properties from the terminal 11 to the terminal block 8 are improved, thus enhancing the heat dissipation of heat generated in the body 10 of the capacitor 12. This results in a longer lifespan for the capacitor 12.

[0061] Furthermore, the capacitor 12 is held in place by the first cover 2 and the second cover 3, thus preventing it from shifting inside the recess 13 when vibration or impact is applied, and reducing the load on the connection between the terminal 11 and the terminal block 8. As a result, the vibration resistance of the power conversion device 1 is improved.

[0062] Furthermore, the sides of the main body 10 are held in place by the first cover 2 and the second cover 3, and the terminal 11 is fixed to the terminal base 8 by screws 15. Therefore, it is not necessary to have a component in the main body 10 that is the opposite side of the end face 14 where the terminal 11 is provided, which abuts against the capacitor 12 in the recess 13 for fixing the capacitor 12. Therefore, even if the main bodies 10 have different axial lengths, as long as the diameters of the main bodies 10 are equal and the axial length is long enough to be accommodated in the recess 13, the capacitor 12 can be fixed in the recess 13. Therefore, it is not necessary to prepare a dedicated first cover 2 for each type of capacitor 12, and manufacturing costs can be reduced. In addition, the plate portion 24 or the abutment portion 25 can also be elastic. In this way, even if the depth of the recess 13 is greater than the diameter of the main body 10 of the capacitor 12, the capacitor can be clamped between the plate portion 24 and the recess 13 by the deformation of the plate portion 24. In addition, the capacitor 12 is held more firmly by the restoring force of the plate portion 24.

[0063] Furthermore, the mounting surface 5a of the first substrate 5 is a conductive portion containing a high-potential portion (hereinafter referred to as the high-voltage conductive portion), on which electrical components are mounted or circuits are formed. In devices with a high-voltage conductive portion, it is sometimes necessary to ensure safety by making the high-voltage conductive portion difficult to access. Here, the mounting surface 5a, which is the high-voltage conductive portion, is covered by the first cover 2, and the first cover 2 needs to be removed in order to access the high-voltage conductive portion. In this embodiment 1, a capacitor 12 is inserted into the recess 13 of the first cover 2, and the first cover 2 is sandwiched between the base 6 and the capacitor 12. In addition, the terminals 11 of the capacitor 12 pass through the exposed portion 2a formed in the first cover 2 and are fixed to the terminal block 8 provided on the mounting surface 5a by a screw 15 operated by a tool. Therefore, if the capacitor 12 is not unscrewed from the recess 13 without removing the screw 15, the first cover 2 cannot be removed from the base 6. That is, if the screw 15 is not operated with a tool, the high-voltage conductive portion cannot be accessed, thereby improving the safety of the power conversion device 1. For example, the power conversion device 1 according to Embodiment 1 can meet the IP20 protection level.

[0064] Furthermore, on the inner side of the recess 13, a gap is formed between the groove 17 and the body 10 of the capacitor 12. The end of the groove 17 connects to the edge 16a of the hole 16 and the edge 13a of the recess, so that even when the capacitor 12 is inserted into the recess 13, air can pass through the hole 16 and the groove 17 to circulate around the body 10. That is, air can circulate around the body 10 of the capacitor 12 inserted into the recess 13, thereby improving heat dissipation.

[0065] Furthermore, since a plate portion 24 of the second cover 3 is spaced between the second substrate 7 and the capacitor 12, insulation between the second substrate 7 and the capacitor 12 can be ensured by the plate portion 24. Therefore, it is not necessary to ensure the insulation distance between the second substrate 7 and the capacitor 12, and the second substrate 7 can be arranged close to the capacitor 12. As a result, miniaturization of the power conversion device 1 can be achieved.

[0066] Figure 12 This is a view of the capacitor and terminal block involved in Modification 1 of Embodiment 1 from one end face. In this Modification 1, the heights of the plurality of terminal blocks 8 connected to one capacitor 12, measured from the mounting surface 5a of the first substrate 5, are different from each other. Specifically, the height h2 of the terminal block 82 is lower than the height h1 of the terminal block 81.

[0067] In this modified example 1, with the capacitor 12 inserted into the recess 13, the heights of the plurality of terminals 11 provided on the capacitor, measured from the mounting surface 5a, are different from each other. Specifically, the height h4 of the terminal 112 is lower than the height h3 of the terminal 111.

[0068] In addition, height h1 is equal to height h3, and height h2 is equal to height h4. When capacitor 12 is inserted into recess 13, terminal block 81 abuts against terminal 111, and terminal block 82 abuts against terminal 112.

[0069] The terminals 11 of capacitor 12 are polarized. If they are connected to terminal block 8 with incorrect polarity, the power conversion device 1 will not perform the expected operation. As shown in this modified example 1, by making the heights of terminal blocks 81 and 82 from the mounting surface 5a different, and the heights of terminals 111 and 112 from the mounting surface 5a different, the power conversion device 1 will not be able to perform the expected operation. Figure 12 In the state shown, when capacitor 12 is rotated 180 degrees about the central axis 10a of body 10, terminal 112 abuts against terminal block 81, but terminal 111 cannot abut against terminal block 82. Therefore, if... Figure 12 The state shown is that the capacitor 12 is connected with the correct polarity. If it is rotated 180 degrees around the central axis 10a, i.e., the polarity is incorrect, even if the capacitor 12 is inserted into the recess 13, the terminal 111 cannot be connected to the terminal block 82. Therefore, in Modification 1, it is possible to prevent the capacitor 12 from being connected to the terminal block 8 when the polarity is incorrect. Thus, by arranging the terminal 11 in a point-symmetrical manner that does not center on the intersection of the central axis 10a and the end face 14, and by setting the height and position of the terminal block 8 when the capacitor 12 is in the correct polarity position, it is possible to prevent the capacitor 12 from being connected to the terminal block 8 when the polarity is incorrect.

[0070] Figure 13 This is a view of the capacitor and terminal block involved in Modification 2 of Embodiment 1 from one end face. In this Modification 2, the multiple terminal blocks 8 connected to one capacitor 12 are all at the same height from the mounting surface 5a, but their distances from the central axis 10a are different. Specifically, the distance d2 between the center of the screw hole 8a of the terminal block 81 and the central axis 10a is shorter than the distance d1 between the center of the screw hole 8a of the terminal block 81 and the central axis 10a.

[0071] Furthermore, the distances between the multiple terminals 11 of a single capacitor, measured from the central axis 10a, are different from each other. Specifically, the distance d4 between the center of the through hole 11a of terminal 111 and the central axis 10a is shorter than the distance d3 between the center of the through hole 11a of terminal 111 and the central axis 10a.

[0072] In addition, distances d1 and d3 are equal, and distances d2 and d4 are equal. When capacitor 12 is inserted into the recess, terminal block 81 abuts against terminal 111, and terminal block 82 abuts against terminal 112.

[0073] Even with the structure shown in Modified Example 2, the terminal 11 can be arranged in a way that is not symmetrical about the intersection of the central axis 10a and the end face 14. Therefore, by setting the height and position of the terminal block 8 when the capacitor 12 is in the correct polarity position to abut the terminal 11, it is possible to prevent the capacitor 12 from being connected to the terminal block 8 when the polarity is incorrect.

[0074] Figure 14 This is a view of the capacitor and terminal block involved in Modification 3 of Embodiment 1 from one end face. In this Modification 3, the heights h5 and h6 of the plurality of terminal blocks 8 connected to one capacitor 12, measured from the mounting surface 5a, are equal, and the distances d5 and d6 between the center axis 10a and the center of the screw hole 8a are also equal. In addition, the heights h7 and h8 of the terminals 11, measured from the mounting surface 5a, are equal, and the distances d7 and d8 between the center axis 10a and the through hole 11a are also equal. Furthermore, the height h5 is equal to the height h7, and the height h6 is equal to the height h8. However, the height h9 of the center axis 10a, measured from the mounting surface 5a, is different from the heights h5, h6, h7, and h8.

[0075] Even with the structure shown in Modified Example 3, the terminal 11 can be arranged in a way that is not symmetrical about the intersection of the central axis 10a and the end face 14. Therefore, by setting the height and position of the terminal block 8 when the capacitor 12 is in the correct polarity position to abut the terminal 11, it is possible to prevent the capacitor 12 from being connected to the terminal block 8 when the polarity is incorrect.

[0076] Figure 15 This is a view of the capacitor and terminal block involved in Modification 4 of Embodiment 1 from the front. In this Modification 4, with the capacitor 12 inserted into the recess 13, the distance d9 between the center of the screw hole 8a of the terminal block 81 and one end face 14 is different from the distance d10 between the center of the screw hole 8a of the terminal block 82 and one end face 14.

[0077] Furthermore, the distance d11 between the center of the through hole 11a of the terminal 111 of capacitor 12 and one end face 14 is different from the distance d12 between the center of the through hole 11a of the terminal 112 and one end face 14. Additionally, distance d9 is equal to distance d11, and distance d10 is equal to distance d12.

[0078] In the case of a configuration as shown in this modified example 4, if... Figure 15 The state shown is assumed to be when capacitor 12 is connected with the correct polarity. Even if capacitor 12 is inserted into recess 13 after rotating 180 degrees around the central axis 10a (i.e., when the polarity is incorrect), the through hole 11a of terminal 11 and the screw hole 8a of terminal block 8 will not overlap, making it impossible to tighten them with screw 15. Therefore, in this modified example 4, it is possible to prevent capacitor 12 from being connected to terminal block 8 with the polarity incorrect.

[0079] Figure 16 This is a partial enlarged perspective view of the exposed portion of the first cover involved in Variation 5 of Embodiment 1. Figure 17 It means in Figure 16 The diagram shows a state where a sheet metal part is embedded in the exposed portion.

[0080] In this modified example 5, two recesses 13A and 13B are formed in the first cover 2. Furthermore, capacitors 12 are inserted into the two recesses 13A and 13B respectively. That is, in this modified example 5, two capacitors 12 are provided in the power conversion device 1.

[0081] The first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23 can be inserted into the exposed portion 2a of the first cover 2. In this modified example 5, by using the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23, the capacitors 12 can be connected in parallel or in series with each other.

[0082] Figure 18 This diagram illustrates the state after capacitors are connected in parallel using sheet metal parts in variation 5. For example... Figure 18 As shown, when capacitors 12 are connected in parallel, first sheet metal part 21 and second sheet metal part 22 are used. Terminal block 8 is located in... Figure 18 The two A sections shown are erected and connected to the terminal 11. That is, when the capacitors 12 are connected in parallel with each other, two terminal blocks 8 are provided on the first substrate 5. The first sheet metal part 21 and the second sheet metal part 22 are sheet metal parts for connecting the capacitors 12 in parallel with each other.

[0083] Figure 19 This diagram illustrates the state after capacitors are connected in series using sheet metal parts in variation 5. For example... Figure 19 As shown, when capacitors 12 are connected in series, a third sheet metal part 23 is used. Terminal block 8 is located in... Figure 19 The three sections B shown are erected and connected to the terminal 11. That is, when the capacitors 12 are connected in series, three terminal blocks 8 are provided on the first substrate 5. One of the three terminal blocks 8 is provided for taking an intermediate potential. The third sheet metal part 23 is a series sheet metal part for connecting the capacitors 12 in series. Furthermore, if it is not necessary to take an intermediate potential, this part of the terminal block 8 is not required. Therefore, if it is not necessary to take an intermediate potential, it is sufficient for the terminal blocks 8 to be erected at two locations.

[0084] Figure 20 This is a perspective view of the first sheet metal part in Variation Example 5. The first sheet metal part 21 is formed by bending a metal sheet. The first sheet metal part 21 has two connecting portions 21b that overlap with the terminals 11 of the capacitor 12. The first sheet metal part 21 has a connecting portion 21a that connects the two connecting portions 21b to each other. Holes 21c and 21d are formed in the connecting portions 21b. Figure 18 As shown in part A, no threads are formed on the inner circumferential surface of the hole 21c formed at the connection portion 21b that connects to the terminal 11 of the terminal block 8 and the capacitor 12. This is because... Figure 10 The screw 15 shown is screwed into the screw hole 8a formed in the terminal block 8, so there is no need to form threads on the inner circumferential surface of the hole 21c.

[0085] On the other hand, a thread is formed on the inner circumferential surface of the hole 21d formed in the connecting portion 21b that is connected only to the terminal 11 of the capacitor 12 and not to the terminal block 8, so that it can be screwed in. Figure 10 The screw 15 is shown. This is because, since it is not connected to the terminal block 8 with the screw hole 8a, the hole 21d formed in the connecting part 21b becomes the object to which the screw 15 is screwed in to connect the connecting part 21b to the terminal 11.

[0086] Figure 21 This is a perspective view of the second sheet metal part in Modified Example 5. The second sheet metal part 22 is formed by bending a metal sheet. The second sheet metal part 22 has two connecting portions 22b that overlap with the terminals 11 of the capacitor 12. The second sheet metal part 22 has a connecting portion 22a that connects the two connecting portions 22b to each other. Holes 22c and 22d are formed in the connecting portions 22b. Figure 18 As shown in part A, no threads are formed on the inner circumferential surface of the hole 22c formed at the connection portion 22b that connects to the terminal 11 of the terminal block 8 and the capacitor 12. This is because... Figure 10 The screw 15 shown is screwed into the screw hole 8a formed in the terminal block 8, so there is no need to form threads on the inner circumferential surface of the hole 22c.

[0087] On the other hand, a thread is formed on the inner circumferential surface of the hole 22d formed at the connection portion 22b that is connected only to the terminal 11 of the capacitor 12 but not to the terminal block 8, so that it can be screwed in. Figure 10 The screw 15 is shown. This is because, since it is not connected to the terminal block 8 with the screw hole 8a, the hole 22d formed in the connecting part 22b becomes the object to which the screw 15 is screwed in to connect the connecting part 22b to the terminal 11.

[0088] Figure 22 This is a perspective view of the third sheet metal part in Modified Example 5. The third sheet metal part 23 is formed by bending a metal sheet. The third sheet metal part 23 has two connecting portions 23b that overlap with the terminals 11 of the capacitor 12. The third sheet metal part 23 has a connecting portion 23a that connects the two connecting portions 23b to each other. Holes 23c and 23d are formed in the connecting portions 23b. Figure 19 As shown in part B, no threads are formed on the inner circumferential surface of the hole 23c formed at the connection portion 23b that connects to the terminal 11 of the terminal block 8 and the capacitor 12. This is because... Figure 10 The screw 15 shown is screwed into the screw hole 8a formed in the terminal block 8, so there is no need to form threads on the inner circumferential surface of the hole 23c.

[0089] On the other hand, a thread is formed on the inner circumferential surface of the hole 23d formed at the connection portion 23b that is connected only to the terminal 11 of the capacitor 12 but not to the terminal block 8, so that it can be screwed in. Figure 10 The screw 15 is shown. This is because, since it is not connected to the terminal block 8 with the screw hole 8a, the hole 23d formed in the connecting part 23b becomes the object to which the screw 15 is screwed in to connect the connecting part 22b to the terminal 11.

[0090] The connecting portions 21a, 22a, and 23a of the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23 have different shapes. The first cover 2 has a first insertion slot 18 for inserting the connecting portion 21a, a second insertion slot 19 for inserting the connecting portion 22a, and a third insertion slot 20 for inserting the connecting portion 23a. The first insertion slot 18 and the second insertion slot 19 are parallel connection slots for inserting sheet metal parts that connect capacitors 12 in parallel. The third insertion slot 20 is a series connection slot for inserting sheet metal parts that connect capacitors 12 in series. The insertion slots 18, 19, and 20 for inserting the connecting portions 21a, 22a, and 23a are determined based on their shapes and relative positions to the connecting portions 21b, 22b, and 23b. Therefore, when inserted into the connecting portions 21a, 22a, and 23a… Figures 17 to 19 In cases where the positions shown are different, interference with the unevenness formed around the exposed portion 2a of the first cover 2 prevents them from being properly positioned. Therefore, it is possible to prevent the capacitors 12 from being misconnected to each other due to incorrect insertion positions of the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23.

[0091] Furthermore, by connecting the terminals 11 of the capacitor 12 to each other using the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23, the capacitors 12 can be connected in series or in parallel. Therefore, compared to connecting the capacitors 12 in series or in parallel via a circuit formed on the first substrate 5 without using the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23, the number of terminal blocks 8 can be reduced. Specifically, without using the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23, four terminal blocks 8 are required to connect the terminal blocks 8 to all the terminals 11 of the capacitor 12. On the other hand, when using the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23, if a parallel connection is desired, only... Figure 18 Two terminal blocks 8 connected to terminal 11 at part A are provided as shown. Alternatively, for a series connection, simply follow the instructions... Figure 19 As shown, three terminal blocks 8 connected to terminal 11 at part B can be set up.

[0092] Furthermore, by enabling the identification of the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23 not only by their shape but also by other elements, insertion errors can be prevented more reliably. For example, the first sheet metal part 21, the second sheet metal part 22, and the third sheet metal part 23 can be identified by their different colors.

[0093] The structure shown in the above embodiments is an example and can be combined with other known technologies. Parts of the structure can also be omitted or changed without departing from the main idea.

[0094] Explanation of the label

[0095] 1 Power conversion device; 2 First cover; 2a Exposed portion; 2b Opposite side; 3 Second cover; 4 Frame; 5 First substrate; 5a Mounting surface; 6 Base; 7 Second substrate; 8, 81, 82 Terminal blocks; 8a Screw hole; 10 Main body; 10a Central shaft; 11, 111, 112 Terminals; 11a Through hole; 12 Capacitor; 13, 13A, 13B Recesses; 13a Edge; 14 One end face; 15 Screw. 16 Hole, 16a Edge, 17 Groove, 18 First Insertion Groove, 19 Second Insertion Groove, 20 Third Insertion Groove, 21 First Sheet Metal Part, 21a Connecting Part, 21b Connecting Part, 21c and 21d Holes, 22 Second Sheet Metal Part, 22a Connecting Part, 22b Connecting Part, 22c and 22d Holes, 23 Third Sheet Metal Part, 23a Connecting Part, 23b Connecting Part, 23c and 23d Holes, 24 Plate Part, 25 Abutting Part.

Claims

1. A power conversion device, characterized in that, have: A capacitor having a columnar body and a plurality of terminals disposed on one end face of the body; The first substrate has a mounting surface provided with a plurality of terminal blocks, each of which is connected to the terminal block; as well as A first cover covers the mounting surface, and a recess is formed on the opposite side of the first cover facing the first substrate for inserting the capacitor when one end face is perpendicular to the mounting surface. When the mounting surface is covered by the first cover, the terminals of the capacitor inserted into the recess are connected to the terminal block. The recess and the terminal block are configured such that by inserting the capacitor into the recess with one end face perpendicular to the mounting surface, the terminals of the capacitor and the terminal block overlap in the insertion direction, and in this overlapping state, the terminals of the capacitor are connected to the terminal block.

2. The power conversion device according to claim 1, characterized in that, The first cover has an exposed portion that allows the terminal block to protrude from the recess. The terminals of the capacitor inserted into the recess are connected in an overlapping manner to the terminal block exposed from the exposed portion.

3. The power conversion device according to claim 1, characterized in that, The terminal block is formed of a rigid body.

4. The power conversion device according to claim 2, characterized in that, The terminal block is formed of a rigid body.

5. The power conversion device according to claim 3, characterized in that, Screw holes are formed in the terminal block. The terminal is secured to the terminal block by screws screwed into the screw holes.

6. The power conversion device according to claim 4, characterized in that, Screw holes are formed in the terminal block. The terminal is secured to the terminal block by screws screwed into the screw holes.

7. The power conversion device according to any one of claims 1 to 6, characterized in that, The plurality of terminals of the capacitor are arranged symmetrically with respect to one end face at a point that does not center on the intersection of the central axis of the body and the one end face. The plurality of terminal blocks are configured to connect to the terminals of the capacitor that is inserted into the recess.

8. The power conversion device according to claim 7, characterized in that, The heights of the terminal blocks connected to the plurality of terminals disposed on the capacitor, respectively, measured from the mounting surface of the first substrate, are different from each other. The multiple terminals of the capacitor are at different heights from the mounting surface when inserted into the recess.

9. The power conversion device according to any one of claims 1 to 6, characterized in that, It also has a second cover that covers the recess.

10. The power conversion device according to claim 9, characterized in that, The capacitor is secured by being sandwiched between the first cover and the second cover.

11. The power conversion device according to claim 9, characterized in that, It also has a second substrate disposed on the opposite side of the capacitor, separated from the second cover, on which electronic components are mounted.

12. The power conversion device according to claim 10, characterized in that, It also has a second substrate disposed on the opposite side of the capacitor, separated from the second cover, on which electronic components are mounted.

13. The power conversion device according to any one of claims 1 to 6, characterized in that, A through hole is formed on the inner side of the recess. A groove is formed that connects the edge of the recess to the edge of the through hole.

14. The power conversion device according to any one of claims 1 to 6, characterized in that, The first cover has a plurality of recesses formed thereon. A plurality of capacitors are provided that are inserted into the plurality of recesses. The power conversion device also includes sheet metal parts for parallel connection or series connection. The sheet metal parts for parallel connection connect the terminals of the multiple capacitors to each other, thereby connecting the multiple capacitors in parallel. The sheet metal parts for series connection connect the terminals of the multiple capacitors to each other, thereby connecting the multiple capacitors in series. The first cover has a parallel slot for inserting the parallel sheet metal parts and a series slot for inserting the series sheet metal parts. The parallel slot does not allow the insertion of the series sheet metal parts, and the series slot does not allow the insertion of the parallel sheet metal parts.

Images