electronic machines

Abstract

In electronic devices where nuts are attached to the housing, the invention aims to improve the moldability of the housing while restricting the rotation of the nuts relative to the housing. [Solution] The nut holder 24 is formed in a shape having a corner portion 25 when viewed from a direction along the axis of the nut 23, and the main body case 11 has a peripheral wall portion 33 that houses the nut holder 24, and the peripheral wall portion 33 has a notch portion 34 through which the corner portion 25 protrudes.

Description

Technical Field

[0001] The present invention relates to an electronic device.

Background Art

[0002] For example, Patent Document 1 discloses a motor unit having a bus bar and a terminal block. In Patent Document 1, the terminal block includes a terminal block body and a nut. The nut body is inserted into a recess provided in the terminal block body. The bus bar is fastened to the terminal block by a connection screw inserted into the nut.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The nut needs to be restricted from rotating with respect to the terminal block body when screwing the connection screw. Therefore, when attaching the nut using the housing as the terminal block body in an electronic device in which electronic components are housed inside the housing, it is necessary to restrict the nut from rotating with respect to the housing. In the structure disclosed in Patent Document 1, the nut is rectangular, and the rotation of the nut is restricted by abutting the side of the nut against the inner wall surface of the recess. However, in such a case, it is necessary to make one side of the rectangular nut as long as possible and ensure a wide contact area between the nut and the peripheral wall surface of the recess. For this reason, the radius of curvature of the corner of the rectangular nut and the radius of curvature of the corner of the recess for accommodating the nut become extremely small, and for example, the moldability of the housing deteriorates.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to improve the moldability of the housing while restricting the nut from rotating with respect to the housing in an electronic device in which the nut is attached to the housing. [Means for solving the problem]

[0006] The present invention employs the following configuration as a means to solve the above problems.

[0007] A first aspect of the present invention is an electronic device comprising: a conductive terminal unit having a busbar; a housing housing an electronic component electrically connected to the conductive terminal unit; and a fastening unit for fastening the busbar and the electronic component, wherein the fastening unit has a nut; a nut holder integrally molded with the nut; and a screw that is screwed onto the nut so as to sandwich the busbar and a part of the electronic component between the nut and the screw, the nut holder is formed in a shape having a corner when viewed from a direction along the axis of the nut, and the housing has a peripheral wall portion that houses the nut holder, and the peripheral wall portion has a notch from which the corner protrudes. [Effects of the Invention]

[0008] According to the present invention, a peripheral wall portion is provided in the housing that can accommodate a nut holder, and a notch is provided in the peripheral wall portion through which the corner of the nut holder protrudes. Therefore, when the nut holder is housed in the peripheral wall portion, the corner of the nut holder protrudes from the inside of the peripheral wall portion to the outside of the peripheral wall portion through the notch. The edge portion connected to this corner portion abuts against the peripheral wall portion, thereby restricting the rotation of the nut holder relative to the housing, and further restricting the rotation of the nut, which is integrated with the nut holder, relative to the housing. According to the present invention, the rotation of the nut relative to the housing can be restricted without providing a corner portion with a small radius of curvature relative to the peripheral wall portion, and the moldability of the housing is improved. Therefore, according to the present invention, in electronic equipment in which a nut is attached to the housing, it is possible to improve the moldability of the housing while restricting the rotation of the nut relative to the housing. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram of a vehicle equipped with a power converter according to one embodiment of the present invention. [Figure 2] This is an exploded perspective view showing the structural schematic configuration of a power converter in one embodiment of the present invention. [Figure 3] This is an exploded perspective view including a low-voltage output terminal unit of a power converter according to one embodiment of the present invention. [Figure 4] This is a perspective view of a nut unit included in a power conversion device according to one embodiment of the present invention. [Figure 5] This is a schematic diagram showing the peripheral wall portion and nut unit of a power conversion device in one embodiment of the present invention, viewed from a direction along the axis of the nut. [Modes for carrying out the invention]

[0010] Hereinafter, an embodiment of the electronic device according to the present invention will be described with reference to the drawings.

[0011] Figure 1 is a schematic diagram of a vehicle 100 equipped with the power converter 1 (electronic device) of this embodiment. The vehicle 100 is, for example, an electric vehicle or a hybrid vehicle. As shown in Figure 1, the vehicle 100 includes, for example, a high-voltage battery HB, a low-voltage battery LB, a motor M, and the power converter 1 of this embodiment.

[0012] The high-voltage battery HB is a secondary battery such as a lithium-ion battery, and outputs relatively high-voltage DC power, for example, several hundred volts. This high-voltage battery HB is a battery that outputs drive power supplied to the motor M, and is a so-called drive battery. The low-voltage battery LB is a secondary battery such as a lead-acid battery, and outputs relatively low-voltage DC power, for example, about 12V. This low-voltage battery LB is a battery that outputs power for auxiliary equipment, which is not shown, and is a so-called auxiliary equipment battery.

[0013] Motor M generates rotational power when power for driving is supplied from a high-voltage battery HB via a power conversion device 1. The rotational power generated by motor M is transmitted to the drive wheels of vehicle 100 via a transmission mechanism (not shown).

[0014] The power converter 1 of this embodiment is a device that performs power conversion. For example, the power converter 1 converts DC power to AC power, AC power to DC power, and voltage. Specifically, the power converter 1 of this embodiment boosts the drive power output from the high-voltage battery HB and converts it to AC power for supply to the motor M. The power converter 1 of this embodiment also converts the regenerative power output from the motor M to DC power, steps down the voltage, and supplies it to the high-voltage battery HB. Furthermore, the power converter 1 of this embodiment steps down the drive power output from the high-voltage battery HB to generate power for auxiliary equipment and supplies it to the low-voltage battery LB.

[0015] As shown in Figure 1, the power conversion device 1 of this embodiment comprises a buck-boost converter 2, an inverter 3, and a DC-DC converter 4. These buck-boost converter 2, inverter 3, and DC-DC converter 4 constitute a power conversion circuit H that performs power conversion.

[0016] The buck-boost converter 2 performs either a boost or a buck conversion of power. For example, the buck-boost converter 2 boosts the drive power supplied from the high-voltage battery HB and outputs it to the inverter 3. Alternatively, the buck-boost converter 2 bucks the regenerative power supplied from the inverter 3 and outputs it to the high-voltage battery HB. Such a buck-boost converter 2 includes a capacitor C and a reactor L.

[0017] Inverter 3 converts DC power to AC power, or AC power to DC power. For example, inverter 3 converts the DC drive power supplied from the step-up / step-down converter 2 into three-phase AC power and outputs it to the motor M. In addition, inverter 3 converts the AC regenerative power supplied from the motor M into DC power and outputs it to the high-voltage battery HB.

[0018] In addition, the buck-boost converter 2 and the inverter 3 include power devices. Each power device has a power transistor. These power transistors have semiconductor elements and are mounted on an insulated circuit board. For example, each power transistor includes a plurality of semiconductor elements formed of, for example, SiC (silicon carbide). Note that the power transistor may include semiconductor elements formed of other materials such as Si (silicon) or GaN (gallium nitride).

[0019] The DCDC converter 4 steps down the driving power output from the high-voltage battery HB and converts it into power for auxiliary devices. Note that the DCDC converter 4 converts DC driving power into DC power for auxiliary devices.

[0020] FIG. 2 is an exploded perspective view showing a schematic structural configuration of the power conversion device 1 of the present embodiment. As shown in FIG. 2, the power conversion device 1 of the present embodiment includes an intelligent power module 10, a main body case 11 (housing), a capacitor unit 12, a reactor unit 13, a DCDC converter unit 14, a connector unit 15, and a low-voltage output terminal unit 16 (conductive terminal unit).

[0021] In the following description, for convenience of explanation, the direction in which the DCDC converter unit 14 and the like are located with respect to the partition portion 31a of the central plate 31, which will be described later, of the main body case 11 is defined as upward, and the direction in which the intelligent power module 10 is located with respect to the partition portion 31a of the central plate 31, which will be described later, of the main body case 11 is defined as downward. However, the installation posture of the power conversion device 1 is not particularly limited.

[0022] The intelligent power module 10 includes a power module 10a, a gate driver board 10b, an ECU board 10C, and the like. The power module 10a includes a plurality of power devices having semiconductor elements, a resin-made power module case for housing these power devices, and the like.

[0023] The gate driver board 10b is a board on which a gate driver is provided to generate drive signals for the buck-boost converter 2 and inverter 3 formed by power devices. Such a gate driver board 10b is laminated on the power module 10a. The ECU board 10C is a board on which an ECU (Electronic Control Unit) that controls the gate driver board 10b is provided. This ECU board 10C is laminated on the gate driver board 10b. Note that these gate driver board 10b and ECU board 10C may be integrated into a single unit.

[0024] Such an intelligent power module 10 includes power devices that form a buck-boost converter 2 or an inverter 3. In other words, the intelligent power module 10 forms at least a part of the buck-boost converter 2 or the inverter 3.

[0025] The main case 11 is a case that houses electronic components such as the intelligent power module 10, capacitor unit 12, reactor unit 13, DC-DC converter unit 14, and connector unit 15. The main case 11 is formed by casting, for example, an aluminum alloy or pure aluminum. This main case 11 comprises an upper cover 30, a central plate 31, and a lower cover 32. These upper cover 30, central plate 31, and lower cover 32 are formed to be separable in the vertical direction.

[0026] The upper cover 30 is the part that covers the DC-DC converter unit 14 and reactor unit 13, which are fixed to the central plate 31 from above. In other words, the upper cover 30 is fastened to the central plate 31 via bolts or the like (not shown).

[0027] The central plate 31 is a support plate located between the upper cover 30 and the lower cover 32. This central plate 31 comprises a flat partition wall portion 31a and an enclosing wall portion 31b provided to surround the partition wall portion 31a from the side.

[0028] In this embodiment, the reactor unit 13 and the DC-DC converter unit 14 are positioned above the partition wall 31a. In this embodiment, the intelligent power module 10 is positioned below the partition wall 31a. In this embodiment, the capacitor unit 12 is provided so as to penetrate the partition wall 31a in the vertical direction. Therefore, the partition wall 31a is provided with an insertion opening 31c for the capacitor unit 12 to pass through.

[0029] These intelligent power modules 10, capacitor unit 12, reactor unit 13, DC-DC converter unit 14, and connector unit 15 are fastened to bosses provided on the partition wall 31a by bolts or the like (not shown).

[0030] Furthermore, a cooling channel is provided inside the partition wall 31a to guide the coolant. By flowing the coolant through this cooling channel, the partition wall 31a functions as a cooling jacket 40, cooling the intelligent power module 10, the capacitor unit 12, the reactor unit 13, the DC-DC converter unit 14, and the connector unit 15.

[0031] The enclosure wall 31b is provided to surround the intelligent power module 10, capacitor unit 12, reactor unit 13, DC-DC converter unit 14, and connector unit 15 from the side. The enclosure wall 31b is connected to the edge of the partition wall 31a and is provided to protrude above and below the partition wall 31a. The upper end of the enclosure wall 31b is in contact with the upper cover 30. The lower end of the enclosure wall 31b is in contact with the lower cover 32.

[0032] The lower cover 32 is the part that covers the intelligent power module 10 and connector unit 15, which are fixed to the central plate 31 from below, from below. The lower cover 32 also covers the capacitor unit 12 from below. This lower cover 32 is fastened to the central plate 31 via bolts or the like (not shown). The lower cover 32 also has an opening 32a for exposing the connector unit 15.

[0033] The capacitor unit 12 is connected to the intelligent power module 10 and is located to the side of the power module 10a. The capacitor unit 12 is a unit that includes a capacitor C provided by the buck-boost converter 2. The capacitor unit 12 comprises elements that form the capacitor C and a housing that covers these elements.

[0034] The reactor unit 13 is fixed to the central plate 31. This reactor unit 13 is connected to the intelligent power module 10 via a busbar (not shown) and, in this embodiment, is located above the central plate 31. The reactor unit 13 is a unit that includes the reactor of the buck-boost converter 2.

[0035] The DC-DC converter unit 14 is fixed to the central plate 31. This DC-DC converter unit 14 is connected to the intelligent power module 10 via a busbar (not shown) and, in this embodiment, is located above the central plate 31. The DC-DC converter unit 14 is the unit that forms the DC-DC converter 4 shown in Figure 1.

[0036] The connector unit 15 is the unit to which the motor-side connector of the motor unit is connected. In this embodiment, the connector unit 15 is located below the partition wall portion 31a of the central plate 31. Furthermore, the connector unit 15 is located even further below the intelligent power module 10.

[0037] Figure 3 is an exploded perspective view including the low-voltage output terminal unit 16. As shown in Figure 2, the low-voltage output terminal unit 16 is fastened to the central plate 31 of the main body case 11. As shown in Figure 3, the low-voltage output terminal unit 16 comprises a busbar 16a and a resin holder 16b.

[0038] The busbar 16a is a conductive member connected to the DC-DC converter unit 14. As shown in Figure 3, the busbar 16a is formed in a plate shape with its front and back surfaces oriented vertically. A bolt insertion hole 16a1 is formed at the tip of the busbar 16a through which the fastening bolts 22 of the fastening unit 20, which will be described later, are inserted.

[0039] The tip of the busbar 16a, which is provided with such a bolt insertion hole 16a1, is located inside the main body case 11 when the low-voltage output terminal unit 16 is attached to the main body case 11.

[0040] As shown in Figure 3, the DC-DC converter unit 14 has a terminal 14a that is fastened to the busbar 16a. The terminal 14a is formed in a plate shape with its front and back surfaces oriented vertically, and a bolt insertion hole 14a1 is formed at its tip through which a fastening bolt 22 is inserted.

[0041] The busbar 16a of the low-voltage output terminal unit 16 and the terminal 14a of the DC-DC converter unit 14 are electrically connected by fastening bolts 22 that are inserted through bolt holes 16a1 and 14a1, respectively.

[0042] The resin holder 16b is a resin retaining member that holds the busbar 16a. In this embodiment, the resin holder 16b is attached to the central plate 31 of the main body case 11, as shown in Figure 2.

[0043] The enclosure wall portion 31b of the main case 11 is provided with a base portion to which a resin holder 16b is attached. The base portion is a part that protrudes from the outer wall surface 31d of the enclosure wall portion 31b, and is formed so that the contact surface of the resin holder 16b is flat. The base portion is provided with a through hole 31e through which a bus bar 16a can be inserted from the outside to the inside of the main case 11.

[0044] Furthermore, as shown in Figure 3, the power converter 1 of this embodiment includes a fastening unit 20. The fastening unit 20 includes a nut unit 21 and a fastening bolt 22. The nut unit 21 is housed in a portion surrounded by a peripheral wall portion 33 provided on the central plate 31 of the main body case 11.

[0045] Figure 4 is a perspective view of the nut unit 21. As shown in this figure, the nut unit 21 includes a nut 23 and a nut holder 24. The nut 23 is a member into which the fastening bolt 22 is screwed, and has a bolt hole 23a with a female thread formed in the center. In this embodiment, the nut 23 is made of metal.

[0046] The nut holder 24 is integrally molded with the nut 23 and holds the nut 23 from the radially outer side. As shown in Figure 4, the nut holder 24 is provided so as to surround the nut 23 from the radially outer side over its entire circumference when viewed from the direction along the axis of the nut 23 (the direction along the bolt hole 23a). In this embodiment, the nut holder 24 is made of resin.

[0047] Figure 5 is a schematic diagram of the peripheral wall portion 33 and the nut unit 21 as viewed from a direction along the axis of the nut 23. As shown in this figure, the nut holder 24 is formed in a rectangular shape with four corners 25 when viewed from a direction along the axis of the nut 23. Of these four corners 25, one is a protruding corner portion 26, and the remaining three are rounded corner portions 27.

[0048] The protruding corner portion 26 is the part that protrudes from the notch portion 34 of the peripheral wall portion 33, as described later, when the nut unit 21 is housed in the peripheral wall portion 33. When the nut unit 21 is housed in the peripheral wall portion 33, as shown in Figure 5, such a protruding corner portion 26 is located outward from the space enclosed by the peripheral wall portion 33, relative to a hypothetical straight line La connecting one end (one end 33a of the peripheral wall portion 33) and the other end (the other end 33b of the peripheral wall portion 33) of the notch portion 34. This protruding corner portion 26 is a corner with a smaller radius of curvature compared to the rounded corner portion 27. In other words, in the nut holder 24, the protruding corner portion 26 has a smaller radius of curvature than the other corners (rounded corner portion 27).

[0049] As shown in Figure 5, the three rounded corners 27 have a larger radius of curvature than the protruding corners 26 and are located inside the space enclosed by the peripheral wall 33. These rounded corners 27 are in contact with the inner wall surface of the peripheral wall 33.

[0050] Furthermore, the peripheral wall portion 33 provided on the central plate 31 is a portion that surrounds the nut unit 21 from the outside when viewed from a direction along the axis of the nut 23. This peripheral wall portion 33 is provided so as to be erected above the partition wall portion 31a of the central plate 31, and is formed to be integral with, for example, the surrounding wall portion 31b.

[0051] The space enclosed by this peripheral wall portion 33 is a housing space for accommodating the nut unit 21. In other words, the peripheral wall portion 33 accommodates the nut unit 21 having a nut holder 24. The inner wall surface of such a peripheral wall portion 33 is the contact surface with the outer wall surface of the nut holder 24. The peripheral wall portion 33 is provided with a notch 34 that connects the space enclosed by the peripheral wall portion 33 to the space outside the peripheral wall portion 33.

[0052] As shown in Figure 5, the notch 34 is provided on a portion of the circumferential direction of the annular peripheral wall 33 when viewed from a direction along the axis of the nut 23. In other words, in this embodiment, the peripheral wall 33 is formed in an annular shape so as to sandwich the notch 34 between one end 33a and the other end 33b.

[0053] Furthermore, for example, the peripheral wall portion 33 is formed to be smaller than the size of the nut holder 24 in the direction along the axis of the nut 23. In other words, when the nut unit 21 is housed in the peripheral wall portion 33, the upper end of the nut unit 21 is located above the upper end of the peripheral wall portion 33. Also, for example, the notch portion 34 is formed in a straight line from the upper end to the lower end of the peripheral wall portion 33.

[0054] Returning to Figure 4, the fastening bolt 22 is a screw whose shaft is screwed into the nut 23. The head of the fastening bolt 22 is positioned to sandwich the busbar 16a and the terminal 14a between itself and the nut 23. This fastens the busbar 16a and the terminal 14a together. In other words, the fastening bolt 22 is screwed into the nut 23 in such a way that it sandwiches the busbar 16a and a part of the DCDC converter unit 14 (electronic component) between itself and the nut 23.

[0055] When assembling the power converter 1 of this embodiment, the nut unit 21 is housed in the space surrounded by the peripheral wall portion 33 provided on the central plate 31. At this time, the nut unit 21 is housed so that the protruding corner portion 26 of the nut holder 24 protrudes from the notch portion 34 of the peripheral wall portion 33.

[0056] Next, the DC-DC converter unit 14 is housed inside the enclosure wall portion 31b of the central plate 31. At this time, the DC-DC converter unit 14 is positioned such that the bolt insertion holes 14a1 of the terminals 14a of the DC-DC converter unit 14 are located above the nuts 23.

[0057] Next, the busbar 16a of the low-voltage output terminal unit 16 is inserted into the through hole 31e to attach the low-voltage output terminal unit 16 to the main case 11. At this time, the low-voltage output terminal unit 16 is positioned such that the bolt insertion hole 16a1 of the busbar 16a is located above the bolt insertion hole 14a1 of the terminal 14a of the DCDC converter unit 14.

[0058] Subsequently, the shaft of the fastening bolt 22 is inserted from above so as to pass through the bolt insertion hole 16a1 of the busbar 16a and the bolt insertion hole 14a1 of the terminal 14a of the DCDC converter unit 14, and then screwed onto the nut 23. This fastens the busbar 16a and the terminal 14a together, and electrically connects the busbar 16a and the DCDC converter unit 14.

[0059] In this embodiment, since the protruding corner portion 26 of the nut holder 24 protrudes from the notch portion 34 of the peripheral wall portion 33, the edge connecting the protruding corner portion 26 and the rounded corner portion 27 abuts against the peripheral wall portion 33, thereby restricting the rotation of the nut holder 24 (i.e., the nut 23) around its axis. Therefore, the fastening bolt 22 can be securely screwed onto the nut 23.

[0060] The power converter 1 of this embodiment, as described above, comprises a low-voltage output terminal unit 16, a main body case 11, and a fastening unit 20. The low-voltage output terminal unit 16 has a busbar 16a. The main body case 11 houses a DC-DC converter unit 14 that is electrically connected to the low-voltage output terminal unit 16. The fastening unit 20 fastens the busbar 16a and the DC-DC converter unit 14. The fastening unit 20 also includes a nut 23, a nut holder 24, and a fastening bolt 22. The nut holder 24 is integrally molded with respect to the nut 23. The fastening bolt 22 is screwed into the nut 23 so as to sandwich the busbar 16a and a part of the DC-DC converter unit 14 between the nut 23 and the bolt 22. The nut holder 24 is also formed in a shape that has a corner portion 25 when viewed from a direction along the axis of the nut 23. The main body case 11 also has a peripheral wall portion 33 that houses the nut holder 24. Furthermore, the peripheral wall portion 33 has a notch portion 34 from which the corner portion 25 protrudes.

[0061] In this embodiment of the power converter 1, the main body case 11 is provided with a peripheral wall portion 33 capable of accommodating a nut holder 24, and the peripheral wall portion 33 is provided with a notch 34 through which the corner portion 25 of the nut holder 24 protrudes. Therefore, when the nut holder 24 is housed in the peripheral wall portion 33, the corner portion 25 of the nut holder 24 protrudes from the inside of the peripheral wall portion 33 to the outside of the peripheral wall portion 33 through the notch 34. The side portion connected to this corner portion 25 abuts against the peripheral wall portion 33, thereby restricting the rotation of the nut holder 24 relative to the main body case 11, and further restricting the rotation of the nut 23, which is integrated with the nut holder 24, relative to the main body case 11. In this embodiment of the power converter 1, the rotation of the nut 23 relative to the main body case 11 can be restricted without providing a corner portion with a small radius of curvature relative to the peripheral wall portion 33, and the moldability of the main body case 11 is improved. Therefore, according to the power converter 1 of this embodiment, in a power converter 1 in which a nut 23 is attached to the main body case 11, it is possible to improve the moldability of the main body case 11 while restricting the rotation of the nut 23 relative to the main body case 11.

[0062] Furthermore, in the power converter 1 of this embodiment, the nut holder 24 is formed in a shape having multiple corners 25 when viewed from a direction along the axis of the nut 23. One of the multiple corners 25 is a protruding corner 26 that protrudes from the notch 34. The radius of curvature of the protruding corner 26 is smaller than the radius of curvature of the other corners 25.

[0063] According to the power converter 1 of this embodiment, since the radius of curvature of the protruding corner portion 26 is small, the side portion connected to the protruding corner portion 26 can be made longer. Therefore, the side portion and the peripheral wall portion 33 can be reliably brought into contact, and the rotation of the nut 23 relative to the main body case 11 can be more reliably restricted. Even in this case, since the protruding corner portion 26 protrudes from the notch portion 34, it is not necessary to provide a corner portion with a small radius of curvature relative to the peripheral wall portion 33.

[0064] Furthermore, in the power converter 1 of this embodiment, the nut 23 is made of metal and the nut holder 24 is made of resin. With this power converter 1 of this embodiment, the nut 23 can be made more rigid than the nut holder 24, and the fastening bolt 22 can be firmly screwed into the nut 23. In addition, the nut holder 24 can be made of an elastically deformable resin, and by fitting the nut holder 24 into the peripheral wall portion 33, the restoring force of the nut holder 24 can more reliably prevent the nut unit 21 from falling off the peripheral wall portion 33.

[0065] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to the above embodiments. The shapes and combinations of the constituent members shown in the above embodiments are examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0066] For example, in the above embodiment, a configuration was described in which the nut holder 24 is rectangular in shape when viewed from a direction along the axis of the nut 23 and has four corners. However, the present invention is not limited thereto, and for example, the radius of curvature of the rounded corners 27 may be further increased so that three rounded corners 27 are arranged on a single circular arc. In such a case, the portion of the nut holder 24 that abuts the inner wall surface of the peripheral wall portion 33 becomes circular when viewed from a direction along the axis of the nut 23.

[0067] Furthermore, in the above embodiment, a configuration was described in which the nut 23 is made of metal and the nut holder 24 is made of resin. However, the present invention is not limited thereto. For example, the nut 23 and the nut holder 24 may be made of the same material.

[0068] Furthermore, in the above embodiment, the fastening unit 20 was used to describe the fastening configuration between the DCDC converter unit 14 and the busbar 16a of the low-voltage output terminal unit 16. However, the present invention is not limited thereto. For example, it is also possible to adopt a configuration in which electronic components such as the capacitor unit 12 and the reactor unit 13 are fastened to the busbar using the fastening unit 20.

[0069] Furthermore, the above embodiments described a configuration in which the electronic device of the present invention is a power converter 1. However, the present invention is not limited thereto. For example, the present invention can also be applied to other electronic devices.

[0070] Furthermore, the above embodiments can also be described, for example, as shown in the following appendix.

[0071] (Note 1) A conductive terminal unit having a busbar, A housing containing electronic components electrically connected to the conductive terminal unit, A fastening unit for fastening the busbar and the electronic component, Equipped with, The fastening unit is Nut and, A nut holder integrally molded with the nut, A screw is screwed into the nut so as to sandwich the busbar and a part of the electronic component between the nut and the screw, It has, The nut holder is formed in a shape having corners when viewed from a direction along the axis of the nut, The housing has a peripheral wall portion that accommodates the nut holder, The peripheral wall portion has a notch portion into which the corner portion protrudes. An electronic device characterized by the following features.

[0072] (Note 2) The nut holder is formed in a shape having multiple corners when viewed from a direction along the axis of the nut, One of the multiple corner portions is a protruding corner portion that protrudes from the notch portion, The radius of curvature of the aforementioned protruding corner is smaller than the radius of curvature of the other aforementioned corners. The electronic device described in Appendix 1, characterized by the features described herein.

[0073] (Note 3) The nut is made of metal, The nut holder is made of resin. The electronic device described in Appendix 1 or 2, characterized by the features described herein. [Explanation of Symbols]

[0074] 1...Power converter (electronic device), 11...Main case (housing), 14...DC-DC converter unit (electronic component), 14a...Terminal, 14a1...Bolt insertion hole, 16...Low voltage output terminal unit, 16a...Busbar, 16a1...Bolt insertion hole, 16b...Resin holder, 20...Fastening unit, 21...Nut unit, 22...Fastening bolt (screw), 23...Nut, 23a...Bolt hole, 24...Nut holder, 25...Corner, 26...Protruding corner, 27...Rounded corner, 30...Upper cover, 31...Central plate, 33...Peripheral wall, 33a...End, 33b...End, 34...Notch

Claims

1. A conductive terminal unit having a busbar, A housing containing electronic components electrically connected to the conductive terminal unit, A fastening unit for fastening the busbar and the electronic component, Equipped with, The fastening unit is Nut and, A nut holder integrally molded with the nut, A screw is screwed into the nut so as to sandwich the busbar and a part of the electronic component between the nut and the screw, It has, The nut holder is formed in a shape having corners when viewed from a direction along the axis of the nut, The housing has a peripheral wall portion that accommodates the nut holder, The peripheral wall portion has a notch portion into which the corner portion protrudes. An electronic device characterized by the following features.

2. The nut holder is formed in a shape having multiple corners when viewed from a direction along the axis of the nut, One of the multiple corner portions is a protruding corner portion that protrudes from the notch portion, The radius of curvature of the aforementioned protruding corner is smaller than the radius of curvature of the other aforementioned corners. The electronic device according to claim 1, characterized by its features.

3. The nut is made of metal, The nut holder is made of resin. The electronic device according to claim 1 or 2, characterized in that it is a feature of the electronic device according to claim 1 or 2.

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