Power Conversion Device

Abstract

The power conversion device (100) comprises a substrate on which power conversion components are mounted, a terminal block (40) mounted on the substrate and equipped with terminals, a base to which the substrate is fixed, and a main body case (50) attached to the base and covering the power conversion components, substrate, and terminal block (40), the main body case (50) comprising a terminal block protection section (51) for protecting the terminal block (40), and the terminal block protection section (51) has an opening formed therein through which a wire is inserted to connect the wire to the terminal of the terminal block (40).

Description

[Technical Field]

[0001] The present disclosure relates to a power conversion device including a terminal block for connecting wiring. [Background technology]

[0002] Power conversion devices such as inverters are equipped with terminal blocks for connecting wiring. Therefore, the enclosure of a power conversion device requires wire insertion holes for inserting wires, making it impossible to create a completely sealed structure. Therefore, from the perspective of user protection, electrical equipment with openings in its enclosure must comply with standards for protection against human contact, solid foreign objects, and water, such as IEC 60529 established by the International Electrotechnical Commission. Generally, to prevent users from accidentally touching live parts, the device must be designed to make the live parts inaccessible and must meet an Ingress Protection (IP) rating of 20. Note that "live parts" refers to conductors and conductive parts to which voltage is applied under normal operating conditions, as defined in IEC 61936-1 established by the International Electrotechnical Commission.

[0003] Patent Document 1 discloses a power conversion device in which a wiring cover is attached to the front cover to prevent a user from accidentally touching a live section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6749522 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the power converter disclosed in Patent Document 1 has a problem in that the wiring work is time-consuming because the wiring cover must be removed when wiring the terminal block.

[0006] The present disclosure has been made in consideration of the above, and aims to obtain a power conversion device that allows wiring work without the need to attach or detach parts, and that prevents the user from unintentionally touching the charging section. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the power conversion device according to the present disclosure includes a substrate on which power conversion components are mounted, a terminal block mounted on the substrate and having terminals, a base to which the substrate is fixed, and a main body case attached to the base and covering the power conversion components, the substrate, and the terminal block. The main body case includes a terminal block protector that protects the terminal block. The terminal block protector has an opening through which a wire is inserted to connect the wire to the terminal of the terminal block. [Effects of the Invention]

[0008] The power conversion device according to the present disclosure has the advantage that wiring work can be performed without the need to attach or detach components, and that the user can be prevented from unintentionally touching the charging section. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a power conversion device according to a first embodiment; [Figure 2] FIG. 1 is an exploded perspective view of a power conversion device according to a first embodiment. [Figure 3] FIG. 1 is a perspective view of a terminal block of a power conversion device according to a first embodiment; [Figure 4] FIG. 1 is a perspective view of a main body case of a power conversion device according to a first embodiment; [Figure 5] FIG. 1 is a perspective view of a portion where a terminal block of a power conversion device according to a first embodiment is installed; [Figure 6] 1 is a top view of a portion where a terminal block of a power conversion device according to a first embodiment is installed. [Figure 7] FIG. 1 is a front view of a portion where a terminal block of a power conversion device according to a first embodiment is installed; [Figure 8] FIG. 1 is a diagram showing the configuration of a simplified test finger used in a protection class test of a power conversion device according to the first embodiment. [Figure 9] FIG. 10 is a diagram showing a state in which a simplified test finger is inserted into a main body case of the power conversion device according to the first embodiment from an upper opening. [Figure 10] FIG. 10 is a perspective view of a portion where a terminal block of a power conversion device according to a second embodiment is mounted; [Figure 11] FIG. 10 is a perspective view of a short-circuiting piece of a power conversion device according to a second embodiment. [Figure 12] FIG. 10 is a perspective view of a main body case and a short-circuiting piece of a power conversion device according to a modification of the second embodiment. [Figure 13] FIG. 10 is a perspective view of a portion where a terminal block of a power conversion device according to a third embodiment is mounted; [Figure 14] FIG. 10 is a top view of a portion where a terminal block of a power conversion device according to a third embodiment is installed. [Figure 15] FIG. 10 is a front view of a portion where a terminal block of a power conversion device according to a third embodiment is installed. [Figure 16] FIG. 10 is a perspective view of a second-stage terminal block of a power conversion device according to a third embodiment. [Figure 17] FIG. 10 is a diagram showing an installation state of a first-stage terminal block and a second-stage terminal block of a power conversion device according to a third embodiment. [Figure 18] FIG. 13 is a perspective view of a portion where a terminal block of a power conversion device according to a modification of the third embodiment is mounted; [Figure 19] FIG. 10 is a perspective view of a main body case of a power conversion device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a power conversion device according to an embodiment will be described in detail with reference to the drawings.

[0011] Embodiment 1 FIG. 1 is a perspective view of a power conversion device according to a first embodiment. FIG. 2 is an exploded perspective view of the power conversion device according to the first embodiment. The power conversion device 100 includes a first substrate 10 on which a capacitor 11, a transformer 12, a varistor 13, and the like are mounted; a second substrate 20 on which heat-generating components (not shown), such as a transistor module and a diode stack, are mounted; a heat sink 30 that serves as a base to which the first substrate 10 and the second substrate 20 are fixed and also serves as a heat dissipation unit that dissipates heat generated by the heat-generating components (not shown); a terminal block 40 mounted on the second substrate 20; and a main body case 50 that covers the first substrate 10, the second substrate 20, and the terminal block 40. The first substrate 10 and the second substrate 20 are electrically connected by wiring (not shown). In the power conversion device 100 according to the first embodiment, the live parts that need to be prevented from being unintentionally touched by a user are the components mounted on the first substrate 10 and the second substrate 20 and the terminal block 40. The main body case 50 is attached to the heat sink 30 by a recessed and protruding fit.

[0012] A columnar spacer 70 is fixed to the heat sink 30, forming a gap between the first substrate 10 and the second substrate 20. A screw hole is formed in an end face of the spacer 70. The main body case 50 is screwed into the screw hole of the spacer 70. For this reason, the main body case 50 cannot be removed from the heat sink 30 simply by releasing the engagement of the recesses and protrusions; a tool is required to remove the main body case 50 attached to the heat sink 30. For this reason, in the power conversion device 100, it is prevented that a user will unintentionally touch the components mounted on the first substrate 10 and the second substrate 20 due to the main body case 50 falling off.

[0013] FIG. 3 is a perspective view of a terminal block of a power conversion device according to the first embodiment. The terminal block 40 includes a plurality of screw-type terminals 41 and a barrier 42 that ensures an insulation distance between the screw-type terminals 41. Here, the arrangement direction of the screw-type terminals 41 is defined as the x-direction, the axial direction of the terminal screws 43 of the screw-type terminals 41 as the z-direction, and the direction perpendicular to the x-direction and the z-direction as the y-direction. The barriers 42 are plate-shaped extending in a direction parallel to the zy-plane and are arranged at intervals in the x-direction so as to sandwich the screw-type terminals 41 from both sides. Here, the +z-direction, which is the direction from the tip of the terminal screw 43 toward the screw head, is defined as the upward direction. The +y-direction, which is the direction in which a wire is inserted toward the screw-type terminal 41, is defined as the backward direction. The +x-direction, which corresponds to the left-hand direction when facing the -y-direction, which corresponds to the forward direction, is defined as the leftward direction. While the terminal block 40 including the screw-type terminals 41 has been described as an example here, the terminal block 40 may also include plug-in terminals that secure wires using spring pressure.

[0014] 4 is a perspective view of a main body case of the power conversion device according to embodiment 1. A terminal block protection section 51 is provided in main body case 50. Terminal block protection section 51 includes plate-shaped protective wall sections 52 extending in a direction parallel to the zy plane, and bridging sections 53 connecting protective wall sections 52 together. Bridging sections 53 are beam-shaped and extend in the x direction.

[0015] The protective wall portion 52 includes a front wall portion 521 that extends the barrier 42 forward when the main body case 50 is attached to the heat sink 30, and an upper wall portion 522 that extends the barrier 42 upward.

[0016] Between the front wall portions 521, a front opening 54 is formed, which serves as a wire insertion hole for inserting wires into the screw-type terminals 41. Between the top wall portions 522, an upper opening 55 is formed, which serves as a screwdriver insertion hole for inserting a screwdriver for turning the terminal screws 43.

[0017] FIG. 5 is a perspective view of a portion of the power conversion device according to the first embodiment where a terminal block is installed. FIG. 6 is a top view of the portion of the power conversion device according to the first embodiment where a terminal block is installed. FIG. 7 is a front view of the portion of the power conversion device according to the first embodiment where a terminal block is installed. Upper opening 55 has a rectangular shape when viewed from above. Here, the minimum width of upper opening 55 in the xy plane is defined as A [mm]. The distance from the upper end of upper wall portion 522 to screw terminal 41 is defined as B [mm]. The minimum width of front opening 54 in the zx plane is defined as E [mm]. The distance from the front end of front wall portion 521 to screw terminal 41 is defined as F [mm].

[0018] FIG. 8 is a diagram showing the configuration of a simplified test finger used in the IP rating test of the power conversion device according to the first embodiment. The simplified test finger 60 has a truncated cone shape with a lower base surface 61 having a diameter r1, an upper base surface 62 having a diameter r2, a height h, and a taper angle θ. The simplified test finger 60 is a simplified version of the shape of the test finger commonly specified in various standards, such as IEC 60335-1 established by the International Electrotechnical Commission and JIS T 0601-1 established by the Japanese Industrial Standards. By using the simplified test finger 60, the IP rating test can be performed under stricter conditions than the test finger specified in the standard. In other words, if the simplified test finger 60 does not come into contact with the screw terminal 41 of the terminal block 40, the test finger will not come into contact with the screw terminal 41 even if a similar IP rating test is performed using the test finger specified in the standard. During the protection rating test, the simplified test finger 60 is inserted into the front opening 54 or the top opening 55 from the upper bottom surface 62 side.

[0019] The test finger specified in the standard does not have a perfect circle in cross section, and its width decreases significantly toward the tip. Therefore, when conducting an IP rating test for the power conversion device 100, two types of simplified test fingers are used depending on the minimum width A of the upper opening 55 and the minimum width E of the front opening 54. If the minimum width A of the upper opening 55 and the minimum width E of the front opening 54 are less than 9.5 mm, the simplified test finger 60 has a diameter r1 of the lower bottom surface 61 = 10 mm, a diameter r2 of the upper bottom surface 62 = 9.5 mm, a height h = 10 mm, and a slope θ = 18.5 degrees. On the other hand, if the minimum width A of the upper opening 55 and the minimum width E of the front opening 54 are 9.5 mm or more and 12 mm or less, the simplified test finger 60 has a diameter r1 of the lower bottom surface 61 = 12 mm, a diameter r2 of the upper bottom surface 62 = 7.1 mm, a height h = 20 mm, and a slope θ = 7 degrees.

[0020] 9 is a diagram showing a state in which a simplified test finger 60 is inserted into the main body case of the power conversion device according to the first embodiment through the upper opening. The diameter of the simplified test finger 60 increases uniformly from the upper bottom surface 62 to the lower bottom surface 61. The slope b of the side surface of the simplified test finger 60 can be expressed as b = 2 tan θ. When the slope b of the side surface of the simplified test finger 60 is set to b = 2 tan θ, the diameter D [mm] of the simplified test finger 60 at a position a distance C [mm] from the upper bottom surface 62 is D = (C - r2) / b.

[0021] The simplified test finger 60 abuts against the upper wall portion 522 when inserted into the main body case 50 to a position where the diameter D of the simplified test finger 60 is equal to the minimum width A of the upper opening 55. Therefore, when the simplified test finger 60 is inserted into the main body case 50 to a position where the diameter D of the simplified test finger 60 is equal to the minimum width A of the upper opening 55, if the distance C from the position where the diameter D of the simplified test finger 60 is equal to the minimum width A of the upper opening 55 to the upper bottom surface 62 is less than the distance B from the upper end of the upper wall portion 522 to the screw terminal 41, the simplified test finger 60 will not come into contact with the screw terminal 41.

[0022] While the case where the simplified test finger 60 is inserted through the upper opening 55 has been described above, the same applies to the case where the simplified test finger 60 is inserted through the front opening 54. That is, when the simplified test finger 60 is inserted into the main case 50 to a position where the diameter D of the simplified test finger 60 at a position of distance C from the upper bottom surface 62 is equal to the minimum width E of the front opening 54 in the zx plane, the length of the portion of the simplified test finger 60 that enters the main case 50 is equal to the distance C from the position where the diameter D of the simplified test finger 60 is equal to the minimum width E of the front opening 54 to the upper bottom surface 62. Therefore, if the distance C from the position where the diameter D of the simplified test finger 60 is equal to the minimum width E of the front opening 54 to the upper bottom surface 62 is less than the distance F from the front end of the front wall portion 521 to the screw terminal 41, the simplified test finger 60 will not come into contact with the screw terminal 41.

[0023] In the power conversion device 100 of embodiment 1, the terminal block protection part 51 is designed so that the diameter D of the simplified test finger 60 is larger than both the minimum width A of the upper opening 55 and the minimum width E of the front opening 54 at a position where the distance C from the upper bottom surface 62 is less than the distance B from the upper end of the upper wall part 522 to the screw-type terminal 41.

[0024] In the IP20 protection rating test, a test finger is pressed against the device with a force of 10 N. If the opening into which the test finger is inserted widens due to the force, the device will not pass the protection rating test. However, in the power conversion device 100 according to the first embodiment, the front wall portion 521 and the upper wall portion 522 are connected by the bridge portion 53, which prevents the front opening 54 or the upper opening 55 from widening even when the test finger is pressed against the device. Therefore, the power conversion device 100 according to the first embodiment can prevent a user from unintentionally touching a live part. Furthermore, the power conversion device 100 according to the first embodiment has a wire insertion hole and a screwdriver insertion hole in the main body case 50, which are required to connect wires to the screw terminals 41. This allows wiring work to be performed without removing the main body case 50. In this way, the power conversion device 100 according to the first embodiment allows wiring work to be performed without the need to attach or detach components, thereby preventing a user from unintentionally touching a live part. Furthermore, since the power conversion device 100 according to embodiment 1 is not configured with a removable wiring cover, there is no need to secure space around the power conversion device 100 for attaching and detaching the wiring cover, and there is no risk of losing the removed wiring cover.

[0025] Embodiment 2 FIG. 10 is a perspective view of a portion of the power conversion device according to the second embodiment on which a terminal block is mounted. FIG. 11 is a perspective view of a short-circuiting piece of the power conversion device according to the second embodiment. In the power conversion device 100 according to the second embodiment, short-circuiting pieces 44 are attached to some of the screw terminals 41, and the screw terminals 41 to which the short-circuiting pieces 44 are attached are short-circuited. The short-circuiting piece 44 has a shape in which two plate-shaped terminal piece portions 441 are connected by a connecting portion 442. The short-circuiting piece 44 is fixed to the screw terminal 41 by fastening the terminal piece portions 441 together with terminal screws 43. A notch 45 is formed in the barrier 42 between the screw terminals 41 to which the short-circuiting pieces 44 are attached, and the short-circuiting piece 44 is fitted into the notch 45. A columnar protrusion 46 is provided adjacent to the notch 45 on the barrier 42 in which the notch 45 is formed.

[0026] The main body case 50 of the power conversion device 100 according to the second embodiment does not have an upper wall portion 522 separating the upper openings 55 directly above the screw-type terminals 41 to which the short-circuiting pieces 44 are attached, and instead forms a connecting opening in which the upper openings 55 directly above the screw-type terminals 41 to which the short-circuiting pieces 44 are attached are connected to each other. The protrusion 46 provided on the barrier 42 of the terminal block 40 is disposed at the center of the connecting opening in the arrangement direction of the screw-type terminals 41, and the width of the connecting opening is narrow at the portion where the protrusion 46 is disposed. Therefore, in the power conversion device 100 according to the second embodiment, when the minimum width of the connecting opening is A' and the distance from the upper end of the upper wall portion 522 to the connecting portion 442 of the short-circuiting piece 44 is B', the terminal block protector 51 is designed such that the diameter D of the simplified test finger 60 is larger than the minimum width A' of the connecting opening at a position where the distance C from the upper bottom surface 62 is less than the distance B' from the upper end of the upper wall portion 522 to the screw-type terminal 41. Therefore, the power conversion device 100 according to the second embodiment can prevent the user from unintentionally touching the charging unit.

[0027] While the structure in which the protrusions 46 are provided on the barrier 42 has been exemplified here, a structure in which a portion of the upper wall portion 522 separating the upper openings 55 immediately above the screw-type terminals 41 to which the short-circuiting pieces 44 are attached may be left. FIG. 12 is a perspective view of a main body case and a short-circuiting piece of a power converter according to a modification of the second embodiment. The main body case 50 of the power converter 100 according to the modification of the second embodiment has a portion of the upper wall portion 522 separating the upper openings 55 immediately above the screw-type terminals 41 to which the short-circuiting pieces 44 are attached left. In the power converter 100 according to the modification of the second embodiment, the terminal block protector 51 is designed so that the diameter D of the simplified test finger 60 is larger than the minimum width A' of the connecting opening at a position where the distance C from the upper bottom surface 62 is less than the distance B' from the upper end of the upper wall portion 522 to the connecting portion 442 of the short-circuiting piece 44. Therefore, the power converter 100 according to the modification of the second embodiment can prevent a user from unintentionally touching a live portion.

[0028] The power conversion device 100 according to embodiment 2 and the power conversion device 100 according to a modified example of embodiment 2 can connect some of the screw-type terminals 41 together without removing the main body case 50, thereby preventing the user from accidentally touching components mounted on the first board 10 or the second board 20 while connecting the screw-type terminals 41 together.

[0029] Embodiment 3 FIG. 13 is a perspective view of a portion where a terminal block of a power conversion device according to embodiment 3 is mounted. FIG. 14 is a top view of the portion where a terminal block of a power conversion device according to embodiment 3 is mounted. FIG. 15 is a front view of the portion where a terminal block of a power conversion device according to embodiment 3 is mounted. In the power conversion device 100 according to embodiment 3, two terminal blocks 40 are mounted at different heights. Hereinafter, the lower terminal block 40 will be referred to as the first-stage terminal block 40, and the upper terminal block 40 will be referred to as the second-stage terminal block 40. The barrier 42 of the first-stage terminal block 40 and the barrier 42 of the second-stage terminal block 40 are aligned in the x direction, which is the arrangement direction of the screw-type terminals 41.

[0030] Fig. 16 is a perspective view of a second-stage terminal block of a power conversion device according to embodiment 3. The second-stage terminal block 40 has a barrier 42 extended forward. Fig. 17 is a diagram showing an installation state of the first-stage terminal block and the second-stage terminal block of a power conversion device according to embodiment 3. The second-stage terminal block 40 is installed behind the first-stage terminal block 40, so when the power conversion device 100 is viewed from the front, the barrier 42 of the second-stage terminal block 40 extended forward overlaps the barrier 42 of the first-stage terminal block 40.

[0031] When the barrier 42 of the second-stage terminal block 40 does not overlap the barrier 42 of the first-stage terminal block 40, if the distance in the y direction between the second-stage terminal block 40 and the first-stage terminal block 40 is short, the barrier 42 of the second-stage terminal block 40 will be located above the terminal screws of the first-stage terminal block 40, making it difficult for an operator to insert wires into the terminal screws of the first-stage terminal block 40. Therefore, when the barrier 42 of the second-stage terminal block 40 does not overlap the barrier 42 of the first-stage terminal block 40, it becomes necessary to increase the distance in the y direction between the screw-type terminals 41 of the first-stage terminal block 40 and the screw-type terminals 41 of the second-stage terminal block 40 in order to make it easier to insert wires into the first-stage terminal block 40.

[0032] In contrast, in the power conversion device 100 according to the third embodiment, the barrier 42 of the second-stage terminal block 40 overlaps the barrier 42 of the first-stage terminal block 40, and therefore the barrier 42 of the second-stage terminal block 40 does not interfere with the insertion of wiring into the first-stage terminal block 40. As a result, in the power conversion device 100 according to the third embodiment, the distance in the y direction between the screw-type terminal 41 of the first-stage terminal block 40 and the screw-type terminal 41 of the second-stage terminal block 40 can be made shorter compared to a case in which the barrier 42 of the second-stage terminal block 40 does not overlap the barrier 42 of the first terminal block 40. As a result, in the power conversion device 100 according to the third embodiment, an increase in the dimension in the y direction caused by having two stages of terminal blocks 40 is suppressed.

[0033] The main body case 50 includes a front wall portion 521 extending the barrier 42 of the first-stage terminal block 40 in the forward direction, an upper wall portion 522 extending the barrier 42 of the first-stage terminal block 40 in the upward direction, the front wall portion 521 extending the barrier 42 of the second-stage terminal block 40 in the forward direction, and an upper wall portion 522 extending the barrier 42 of the second-stage terminal block 40 in the upward direction. The upper wall portion 522 extending the barrier 42 of the first-stage terminal block 40 in the upward direction and the front wall portion 521 extending the barrier 42 of the second-stage terminal block 40 in the forward direction are integral with each other. The main body case 50 is formed with a front opening 54 for inserting wires into the screw-type terminals 41 of the first-stage terminal block 40, an upper opening 55 for inserting a screwdriver for turning the terminal screws 43 of the first-stage terminal block 40, a front opening 54 for inserting wires into the screw-type terminals 41 of the second-stage terminal block 40, and an upper opening 55 for inserting a screwdriver for turning the terminal screws 43 of the second-stage terminal block 40. The upper opening 55 for inserting a screwdriver for turning the terminal screws 43 of the first-stage terminal block 40 and the front opening 54 for inserting wires into the screw-type terminals 41 of the second-stage terminal block 40 are connected.

[0034] As with embodiment 1, the simplified test finger 60 is prevented from reaching the screw-type terminal 41 at the upper opening 55 and front opening 54 of each of the first and second stages, thereby preventing the user from unintentionally touching the live part.

[0035] The power conversion device 100 of embodiment 3 can reduce the spacing between the terminal blocks 40 by stacking the barriers 42, which generally protrude to ensure the insulation distance between adjacent terminals, which is the biggest bottleneck when trying to implement multiple terminal blocks 40.This makes it possible to effectively utilize the space inside the main body case 50, thereby making it possible to reduce the size.

[0036] In the above-described first to third embodiments, front wall portion 521 and upper wall portion 522 are rectangular, but front wall portion 521 and upper wall portion 522 are not limited to being rectangular. That is, the front ends of front wall portion 521 and upper wall portion 522 do not need to be perpendicular to first substrate 10, and the upper ends of front wall portion 521 and upper wall portion 522 do not need to be parallel to first substrate 10.

[0037] FIG. 18 is a perspective view of a portion of a power converter 100 according to a modification of the third embodiment, on which a terminal block is mounted. In the power converter 100 according to the modification of the third embodiment, the front wall 521 and the upper wall 522 of the terminal block protector 51 are integrally formed in a triangular shape, and an inclined end 524 is provided that extends linearly from the top to the front. Regarding the first-stage terminal block 40, the power converter 100 according to the modification of the third embodiment replaces the distance F from the front end of the front opening 54 to the screw terminal 41 in the power converter 100 according to the third embodiment with the shortest distance H from the inclined end 524 to the screw terminal 41, and satisfies the condition that C is less than B when H=D, thereby preventing a user from unintentionally touching a live part. Regarding the second-stage terminal block 40, the simplified test finger 60 is inserted through the front opening 54 in the same manner as the first-stage terminal block 40. Regarding the second-stage terminal block 40, when inserting the simplified test finger 60 from the upper opening 55, by satisfying the condition that C is less than B when A=D, it is possible to prevent the user from unintentionally touching the live part.

[0038] In the power conversion device 100 according to the modification of the third embodiment, the screw terminals 41 are easily visible from the outside, and therefore the user can easily perform the wiring work to the screw terminals 41.

[0039] Here, an example has been given in which the inclined end portion 524 is provided so as to extend linearly from above to the front, but the inclined end portion may have a shape that forms a curve that is convex upward or downward in the yz plane.

[0040] In addition, in the example shown here, the barrier 42 of the first-stage terminal block 40 overlaps the barrier 42 of the second-stage terminal block 40, and the front wall 521 and the upper wall 522 form an integral triangular shape with the inclined end 524 extending linearly from above to the front. However, in a structure in which the barrier 42 of the second-stage terminal block 40 does not overlap the barrier 42 of the first-stage terminal block 40, the front wall 521 and the upper wall 522 can form an integral triangular shape with the inclined end 524 extending linearly from above to the front. It is also possible to provide the inclined end 524 in a single-stage terminal block 40. Even in these structures, by satisfying the condition that C is less than B when H = D, it is possible to prevent the user from unintentionally touching the live part.

[0041] Embodiment 4 19 is a perspective view of a main body case of a power conversion device according to embodiment 4. In the power conversion device according to embodiment 4, terminal block protection section 51 of main body case 50 includes front protection section 511 and upper protection section 512. Front protection section 511 closes the front of terminal block 40 except for front opening 54 which forms a wire insertion hole for inserting wires to be attached to screw-type terminals 41. Upper protection section 512 closes the upper side of terminal block 40 except for upper opening 55 which forms a screwdriver insertion hole for inserting a screwdriver for turning terminal screws 43. In power conversion device 100 according to embodiment 4, the minimum width of front opening 54 and the minimum width of upper opening 55 are less than 12 mm.

[0042] When the spacing between the barriers 42 of the terminal block 40 is 12 mm or more, even if the terminal block protector 51 that extends the barriers 42 forward and upward is provided as in the power conversion devices 100 according to the first to third embodiments, the simplified test finger 60 passes through a gap in the front wall portion 521 or the upper wall portion 522 and comes into contact with the screw terminals 41. In the power conversion device 100 according to the fourth embodiment, the terminal block protector 51 does not have a shape that extends the barriers 42, and therefore the minimum widths of the front opening 54 and the upper opening 55 are not restricted by the spacing between the barriers 42. Therefore, the power conversion device 100 according to the fourth embodiment can be configured so that the simplified test finger 60 does not come into contact with the screw terminals 41, regardless of the spacing between the barriers 42 of the terminal block 40. As a result, the power conversion device 100 according to the fourth embodiment can prevent a user from unintentionally touching a live portion.

[0043] The configurations shown in the above embodiments are merely examples of the content, and may be combined with other known technologies, or parts of the configurations may be omitted or modified without departing from the spirit of the invention. [Explanation of symbols]

[0044] 10 first substrate, 11 capacitor, 12 transformer, 13 varistor, 20 second substrate, 30 heat sink, 40 terminal block, 41 screw terminal, 42 barrier, 43 terminal screw, 44 shorting piece, 45 notch, 46 protrusion, 50 main body case, 51 terminal block protection portion, 52 protection wall portion, 53 bridging portion, 54 front opening, 55 upper opening, 60 simplified test finger, 61 lower bottom surface, 62 upper bottom surface, 70 spacer, 100 power conversion device, 441 terminal strip portion, 442 connecting portion, 511 front protection portion, 512 upper protection portion, 521 front wall portion, 522 upper wall portion, 524 inclined end portion.

Claims

1. a substrate on which power conversion components are mounted; a terminal block mounted on the substrate and having terminals; a base portion to which the substrate is fixed; a main body case attached to the base portion to cover the power conversion component, the circuit board, and the terminal block; the main body case includes a terminal block protection portion that protects the terminal block, The terminal block protection portion has an opening through which a wire is inserted to connect the wire to the terminal of the terminal block, the terminal is a screw-type terminal that fixes the wiring with a terminal screw, the terminal block includes a plurality of the screw terminals and barriers disposed between the screw terminals to ensure an insulation distance between the screw terminals; A power conversion device characterized in that the terminal block protection part has wall parts that are arranged on extensions of the barrier in both the upward direction, which is the direction in which a screwdriver for turning the terminal screw is inserted, and the forward direction, which is the direction in which the wiring is inserted.

2. The power conversion device according to claim 1 , wherein the main body case has a structure that requires the use of a tool to attach to and detach from the base portion.

3. The power conversion device according to claim 1 , wherein the terminal block protection portion includes a bridge portion that connects the wall portions together.

4. the wall portion includes an upper wall portion extending the barrier in the upward direction and a front wall portion extending the barrier in the forward direction, the opening includes an upper opening surrounded by the upper wall portion and the bridge portion, and a front opening surrounded by the front wall portion and the bridge portion, the upper opening forms a driver insertion hole into which the driver is inserted; The power conversion device according to claim 3 , wherein the front opening forms a wire insertion hole into which the wire is inserted.

5. The power conversion device according to claim 4, characterized in that the front wall portion and the upper wall portion are integrally formed, have a triangular shape when viewed from a direction perpendicular to each of the upward direction and the forward direction, and have an inclined end portion extending linearly from the top to the front.

6. some of the plurality of screw-type terminals are provided with short-circuiting pieces for short-circuiting the screw-type terminals together; the barrier, which is disposed between the screw terminals to which the shorting pieces are attached, has a notch formed therein into which the shorting pieces are fitted; at least a portion of the upper wall portion extending upward from the barrier in which the notch is formed is missing, so that the upper openings above the screw-type terminals to which the short-circuiting pieces are attached are connected to each other to form a connecting opening, The power conversion device according to claim 4 , wherein the short-circuit piece is detachable through the connecting opening.

7. The two terminal blocks are arranged in two tiers, one above the other, with the axial positions of the terminal screws being different, The power conversion device according to claim 1 , wherein the positions of the barriers of the two terminal blocks in the arrangement direction of the screw terminals are aligned.

8. The power conversion device according to claim 7 , wherein the barrier of the upper terminal block and the barrier of the lower terminal block overlap in the front-to-rear direction.

9. The power conversion device according to any one of claims 1 to 8, characterized in that the opening has a shape that prevents a test finger specified in IEC 60335-1, a standard established by the International Electrotechnical Commission, from being inserted until it contacts the terminal.

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