Power supply unit

Abstract

To control increases in manufacturing costs.SOLUTION: A power supply board enclosure 2 is configured by combining two sheet metal members 10 and 20 so as to be able to accommodate a power supply board 100. The sheet metal member 10 includes a main body portion 11, inner extension portions 15 to 17 connected to the main body portion 11 via bent portions 11a to 11c at the ends of the main body portion 11. The inner extension portions 15 to 17 are provided with vertical portions 15b to 17b that face the main body portion 11 and support the power supply board 100. The vertical portions 15b to 17b are located within an internal space S surrounded by the two sheet metal members 10 and 20.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to , electricity a source unit.

Background Art

[0002] Patent Document 1 describes a power supply board enclosure configured to accommodate a power supply board on which a plurality of electronic components including a power supply circuit are mounted by combining two sheet metal members.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the power supply board enclosure described in Patent Document 1, since an inner extending portion for attaching the power supply board is formed by bending a facing region portion of one sheet metal member facing the power supply board, a gap is formed between the inner extending portion and the main body portion of the sheet metal member. And a gap filling member is provided in the gap. Since this gap filling member is made of a material different from that of the sheet metal member and is composed of a flame-retardant resin material, there is a problem that the manufacturing cost of the power supply board enclosure increases.

[0005] An object of the present invention is to provide electric a source unit capable of suppressing an increase in manufacturing cost.

Means for Solving the Problems

[0007] The power supply unit of the present invention is a power supply unit configured to support a power supply board, and includes a flat main body portion, a first extending portion, and a second extending portion. The first extending portion is provided with a first board support portion for supporting the power supply board and a first connecting portion connecting the main body portion and the first board support portion. When viewed from a direction orthogonal to the surface of the power supply board facing the main body portion, the main body portion and the first board support portion overlap. The second extending portion is provided with a second board support portion for supporting the power supply board and a second connecting portion connecting the main body portion and the second board support portion. When viewed from a direction orthogonal to the surface of the power supply board facing the main body portion, the main body portion and the second board support portion overlap. The power supply board has a first side and a second side that form an outer shape along a first virtual line passing through its center of gravity and extending in the in-plane direction of the surface, and a third side and a fourth side that form the outer shape along a second virtual line passing through the center of gravity, orthogonal to the first virtual line, and extending in the in-plane direction. The power supply board is provided with a first hole and a second hole. In a region closer to the first side than the first virtual line and closer to the third side than the second virtual line, it is fastened to the first board support portion by a first screw passing through the first hole. In a region closer to the second side than the first virtual line and closer to the fourth side than the second virtual line, it is fastened to the second board support portion by a second screw passing through the second hole , further comprising a support dish for supporting the main body portion, the support dish having one rounded corner 。 Also, from another perspective, the power supply unit of the present invention is a power supply unit configured to be able to support a power supply substrate, and includes a flat main body portion, a first extending portion, and a second extending portion. The first extending portion is provided with a first substrate support portion for supporting the power supply substrate and a first connecting portion for connecting the main body portion and the first substrate support portion. When viewed from a direction orthogonal to the surface of the power supply substrate facing the main body portion, the main body portion and the first substrate support portion overlap. The second extending portion is provided with a second substrate support portion for supporting the power supply substrate and a second connecting portion for connecting the main body portion and the second substrate support portion. When viewed from a direction orthogonal to the surface of the power supply substrate facing the main body portion, the main body portion and the second substrate support portion overlap. The power supply substrate has a first side and a second side that form an outer shape along a first virtual line passing through its center of gravity and extending in the in-plane direction of the surface, and a third side and a fourth side that form the outer shape along a second virtual line passing through the center of gravity, orthogonal to the first virtual line, and extending in the in-plane direction. The power supply substrate is provided with a first hole and a second hole. In a region closer to the first side than the first virtual line and closer to the third side than the second virtual line, it is fastened to the first substrate support portion by a first screw passing through the first hole. In a region closer to the second side than the first virtual line and closer to the fourth side than the second virtual line, it is fastened to the second substrate support portion by a second screw passing through the second hole. It further comprises a bottom plate for supporting the main body portion, the bottom plate having one rounded corner.

Advantages of the Invention

[0008] This According to the power supply unit of the invention, it is not necessary to provide a gap filling member for filling gaps, and it is possible to suppress an increase in manufacturing cost electric It becomes possible to obtain a power supply unit 。

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0010] Hereinafter, a power supply unit according to an embodiment of the present invention will be described. As shown in Figs. 1 to 4, the power supply unit 1 mainly includes an enclosure 2 for a power supply board formed by combining two sheet metal members 10 and 20 so as to be able to accommodate a power supply board 100 (see Figs. 3 and 4), and a support dish 3 for supporting the enclosure 2. In the present embodiment, based on the vertical direction A shown in Fig. 1, the front-rear direction B orthogonal to the vertical direction A, and the left-right direction C orthogonal to the vertical direction A and the front-rear direction B, the following description will be given. Note that the installation direction of the power supply unit 1 or the enclosure 2 for the power supply board may be appropriately changed and is not particularly limited.

[0011] As shown in FIG. 1, the enclosure 2 has an internal space S surrounded by two sheet metal members 10 and 20. A power supply board 100 is disposed in this internal space S. As shown in FIGS. 3 and 4, the power supply board 100 has a plurality of electronic components 100b including a power supply circuit mounted on a surface 100a facing the sheet metal member 20, and its periphery is surrounded by the enclosure 2 to meet a predetermined fire protection standard. Further, the power supply board 100 has holes 100c and 100 e formed at two front corners, and a hole 100 d formed at a rear lower corner. Screws 8 are passed through these three holes 100c to 100e to fix the power supply board 100 to the sheet metal member 10. Further, a slit 100f is formed at a rear upper corner of the power supply board 100.

[0012] One of the two sheet metal members 10 and 20, the sheet metal member 10 (the first sheet metal member), as shown in FIGS. 2 and 5, has a plate-like main body portion 11 extending in the vertical direction A and the front-rear direction B, a plate-like bottom portion (bottom plate) 12 extending in the front-rear direction B and the left-right direction C from the lower end of the main body portion 11, and a plate-like rear portion 13 extending in the vertical direction A and the left-right direction C from the rear end of the main body portion 11. In the present embodiment, the sheet metal member 10 is composed of a single metal plate by the main body portion 11, the bottom portion 12, and the rear portion 13, but one sheet metal member 10 may be formed by connecting a plurality of metal plates.

[0013] As shown in Fig. 5, three inner extending portions 15 to 17 are connected to the main body portion 11 via bent portions 11a to 11c at the ends. These inner extending portions 15 to 17 are arranged separately from each other as mounting portions for attaching the power supply substrate 100 to the main body portion 11. The inner extending portion 15 is arranged at the upper front corner of the main body portion 11. The inner extending portion 15 has a horizontal portion 15a extending rightward from the bent portion 11a and a vertical portion 15b extending downward from the right end of the horizontal portion 15a. This vertical portion 15b functions as a substrate support portion for screw-fixing the power supply substrate 100. The horizontal portion 15a has a length for separating the main body portion 11 and the power supply substrate 100 by a predetermined distance when the power supply substrate 100 is attached to the vertical portion 15b. This predetermined distance is the shortest separation distance capable of preventing the growth of whiskers that short-circuit between the power supply substrate 100 and the main body portion 11. Thereby, it is possible to prevent the power supply substrate 100 and the main body portion 11 from being electrically connected and short-circuited while suppressing the enlargement of the enclosure 2 in the left-right direction C. Also, since the separation distance between the main body portion 11 and the power supply substrate 100 is relatively small, it becomes difficult for screws or the like to enter between them. Also in this case, it is possible to prevent the power supply substrate 100 and the main body portion 11 from being short-circuited via a screw. Two reinforcing pieces 15c for reinforcing the vertical portion 15b are formed at the front end and the rear end of the vertical portion 15b. A screw hole 15b1 penetrating in the left-right direction C is formed in the vertical portion 15b. The screw hole 15b1 is composed of a hole portion 15b2 protruding rightward from the vertical portion 15b and a female screw 15b3 formed on the inner peripheral surface of the hole portion 15b2.

[0014] The inner extending portion 16 is disposed at the front lower corner of the main body portion 11. The inner extending portion 16 has a vertical portion 16a extending rightward from the bending portion 11b and a vertical portion 16b extending rearward from the right end of the vertical portion 16a. This vertical portion 16b functions as a substrate support portion for screw-fixing the power supply substrate 100. Similar to the above-described horizontal portion 15a, the vertical portion 16a has a length for separating the main body portion 11 and the power supply substrate 100 by a predetermined distance in a state where the power supply substrate 100 is attached to the vertical portion 16b. Further, a reinforcing piece 16c for reinforcing the vertical portion 16b is formed at the upper end of the vertical portion 16b. Further, a screw hole 16b1 penetrating in the left-right direction C is formed in the vertical portion 16b. The screw hole 16b1 is composed of a hole portion 16b2 protruding from the vertical portion 15b toward the main body portion 11 and a female screw 16b3 formed on the inner peripheral surface of the hole portion 16b2.

[0015] Further, as shown in FIGS. 5 and 6, the main body portion 11 has a recess 19 that opens toward the vertical portion 16b. The recess 19 is formed at a position facing the vertical portion 16b of the main body portion 11 and faces the entire screw hole 16b. That is, the recess 19 is formed such that a portion of the main body portion 11 facing the entire screw hole 16b sinks. By forming such a recess 19 in the main body portion 11, as shown in FIG. 6, even if the separation distance between the vertical portion 16b and the main body portion 11 is small, the distance from the hole portion 16b2 to the bottom surface of the recess 19 is increased by the recess 19. Therefore, when forming the female screw 16b3 on the inner peripheral surface of the hole portion 16b2 with a tap, the tip of the tap does not contact the main body portion 11, and the female screw is easily formed. Since the hole portion 15b2 of the screw hole 15b1 protrudes rightward from the vertical portion 15b, the formation position of the female screw 15b3 is separated from the main body portion 11. Therefore, even if a recess is not formed at a position facing the vertical portion 15b of the main body portion 11, the tip of the tap does not contact the main body portion 11 when forming the female screw 15b3.

[0016] The inner extending portion 17 is disposed at the corner of the lower rear part of the main body portion 11. The inner extending portion 17 has a vertical portion 17a extending rightward from the bending portion 11c and a vertical portion 17b extending forward from the right end of the vertical portion 17a. This vertical portion 17b functions as a substrate support portion for screw-fixing the power supply substrate 100. Also, similar to the above-described horizontal portion 15a, the vertical portion 17a has a length for separating the main body portion 11 and the power supply substrate 100 by a predetermined distance in a state where the power supply substrate 100 is attached to the vertical portion 17b. A reinforcing piece 17c for reinforcing the vertical portion 17b is formed at the upper end of the vertical portion 17b. Further, a screw hole 17b1 penetrating in the left-right direction C is formed in the vertical portion 17b. The screw hole 17b1 is composed of a hole portion 17b2 protruding rightward from the vertical portion 17b and a female screw 17b3 formed on the inner peripheral surface of the hole portion 17b2. Also in this case, since the hole portion 17b2 of the screw hole 17b1 protrudes rightward from the vertical portion 17b, the formation position of the female screw 17b3 is separated from the main body portion 11. Therefore, even if a concave portion is not formed at the position facing the vertical portion 17b of the main body portion 11, the tip of the tap does not contact the main body portion 11 when forming the female screw 17b3.

[0017] Also, as shown in FIG. 5, the sheet metal member 10 has a horizontal portion 18 connected to the main body portion 11 via a bending portion 11d at the upper part of the main body portion 11. The horizontal portion 18 extends longitudinally in the front-rear direction B. A screw hole 18a penetrating in the up-down direction A is formed in the horizontal portion 18. The screw hole 18a is composed of a hole portion 18a1 formed to protrude downward from the horizontal portion 18 and a female screw 18a2 formed on the inner peripheral surface of the hole portion 18a1.

[0018] As shown in FIG. 5, the bottom portion 12 is connected via a bent portion 11e at the lower end of the main body portion 11. The bottom portion 12 extends rightward from the bent portion 11e and has a bottom surface 12a on which the sheet metal member 20 is erected. At the front end of the bottom portion 12, a vertical portion 12b extending in the left - right direction C is connected via a bent portion 12e. On the vertical portion 12b, a pressing portion 12c is formed which extends upward and whose upper end is bent rearward. The pressing portion 12c is formed at the left end in the left - right direction C of the vertical portion 12b. In this way, since the pressing portion 12c is formed on the bottom portion 12, as shown in FIG. 2(a), when the two sheet metal members 10 and 20 are combined, the lower end portion of the side plate 23 (described later) of the sheet metal member 20 can be pressed from the outside toward the inside (rearward). Thereby, the displacement of the side plate 23 of the sheet metal member 20 to the outside is suppressed, and it is possible to prevent a gap exceeding a predetermined fire - prevention standard from occurring between the front end of the main body portion 11 of the sheet metal member 10 and the left end of the side plate 23 of the sheet metal member 20. Also, at the right end of the bottom portion 12, a vertical portion 12d extending in the front - rear direction B is connected via a bent portion 12f. The vertical portion 12d abuts against the lower end of the opposing plate 21 (described later) and performs positioning when the sheet metal member 20 is erected on the bottom surface 12a.

[0019] As shown in FIG. 5, the rear portion 13 is connected via a bent portion 11f at the rear end of the main body portion 11. The rear portion 13 has a vertical plane portion 13a that extends upward from the center in the up - down direction A at the rear end of the main body portion 11, and a horizontal plane portion 13b that extends forward from the upper end of the vertical plane portion 13a. On the horizontal plane portion 13b, a slit 13b1 that can be fitted into a slit 100f of the power supply substrate 100 is formed. Thereby, as shown in FIG. 4, the power supply substrate 100 is also supported by the rear portion 13. Also, on the vertical plane portion 13a, a through - hole 13a1 and a slit 13a2 for fixing a gap - filling member 30 (described later) are formed.

[0020] Of the two sheet metal members 10 and 20, the other sheet metal member 20 (the other sheet metal member: the second sheet metal member) is positioned parallel to the main body portion 11 and has an opposing plate 21 that faces in the left - right direction C. The top plate 22 and the two side plates 23 and 24 are formed of a single metal plate by sheet metal, but one sheet metal member 20 may also be formed by connecting a plurality of metal plates.

[0021] As shown in FIGS. 1 and 3, the opposing plate 21 has two vertical plane portions 21a and 21b that extend in the up - down direction A and the front - rear direction B, and a vertical plane portion 21c that extends in the up - down direction A and the left - right direction C. The vertical plane portion 21a is arranged at a position farther from the main body portion 11 than the vertical plane portion 21b, and the two vertical plane portions 21a and 21b are connected by the vertical plane portion 21c. In this way, the opposing plate 21 is bent in a stepped shape in the front - rear direction B.

[0022] As shown in FIGS. 1 and 3, the top plate 22 has two horizontal plane portions 22a and 22b that extend in the front - rear direction B and the left - right direction C, and a vertical plane portion 22c that extends in the up - down direction A and the front - rear direction B. The horizontal plane portion 22a is arranged above the horizontal plane portion 22b, and the two horizontal plane portions 22a and 22b are connected by the vertical plane portion 22c. In this way, the top plate 22 is bent in a stepped shape in the left - right direction C. The right end of the top plate 22 (the right end of the horizontal plane portion 22b) is connected via the bent portion 21e at the upper end of the opposing plate 21. On the horizontal plane portion 22a of the top plate 22, as shown in FIG. 1, a hole (not shown) for inserting the screw 9 is formed at a position facing the screw hole 18a when the two sheet metal members 10 and 20 are combined. Thereby, when the two sheet metal members 10 and 20 are combined, by tightening the screw 9 into the screw hole 18a, the two sheet metal members 10 and 20 can be firmly fixed. For this reason, it becomes difficult for the two sheet metal members 10 and 20 to slip, and it becomes even more difficult for a gap to occur between them. Further, in front of the horizontal plane portion 22b of the top plate 22, a plurality of through - holes 22b1 for heat dissipation are formed. These through - holes 22b1 are formed to have a diameter that satisfies a predetermined fire - prevention standard.

[0023] As shown in FIGS. 1 and 2, among the two side plates 23 and 24, one side plate 23 is arranged in the front, and the other side plate 24 is arranged in the rear, both having a vertical plane extending in the vertical direction A and the horizontal direction C. The upper end of the side plate 23 is connected via the bent portion 22f at the front end of the top plate 22, and the right end is connected via the bent portion 21f at the front end of the opposing plate 21. Also, a plurality of through holes 23a for heat dissipation are formed in the side plate 23. These through holes 23a are also formed to have a diameter that satisfies a predetermined fire protection standard. The upper end of the side plate 24 is connected via the bent portion 22g at the rear end of the top plate 22, and the right end is connected via the bent portion 21g at the rear end of the opposing plate 21. Also, as shown in FIG. 2(b), the side plate 24 has two cutout portions 24a and 24b. The cutout portion 24a is formed at the left end of the side plate 24 at the center and slightly above the center in the vertical direction A, and is blocked by the rear portion 13 when the two sheet metal members 10 and 20 are combined. Also, the cutout portion 24b is formed at the lower end of the side plate 24 from the center to the right end in the horizontal direction C, and is blocked by a gap filling member 30 described later.

[0024] In this way, the sheet metal member 20 has the opposing plate 21, the top plate 22, and the two side plates 23 and 24, and as shown in FIG. 3, it opens downward and to the left, and can form an internal space S for accommodating the power supply board 100 together with the sheet metal member 10.

[0025] Note that, as shown in FIGS. 2(b) and 3, a gap filling member 30 for filling the gap between the side plate 24 and the bottom portion 12 (cutout portion 24b) is arranged in the internal space S. The gap filling member 30 in this embodiment is made of a flame-retardant resin material (a resin material that satisfies the V-1 standard in the UL94 standard, which is one of the flame-retardant standards), but it may also be made of a resin material having a flame retardancy of V-0 or higher in the UL94 standard or a metal material.

[0026] As shown in FIGS. 1 and 7, the support dish 3 has a bottom plate 3a that supports the enclosure 2. A wall portion 3b standing upright in the vertical direction A is formed at the periphery of the bottom plate 3a. Further, as shown in FIG. 7, a plurality of guide portions 3c standing upright in the vertical direction A are formed on the bottom plate 3a. Also, two guide portions 3d are formed on the wall portion 3b. These guide portions 3c and 3d are arranged so as to surround the periphery of the enclosure 2 disposed on the support dish 3, and are members for guiding when the enclosure 2 is disposed on the support dish 3.

[0027] Further, as shown in FIG. 7, two pressing portions 3e and 3f standing upright in the vertical direction A are formed on the bottom plate 3a. As shown in FIG. 8, the pressing portion 3e extends in the front-rear direction B, and its upper surface is an inclined surface that slopes downward as it goes from the front to the rear. Also, the rear end portion of the pressing portion 3e is arranged at a position where it can press rearward the vicinity of the left end of the lower end of the side plate 23 of the enclosure 2 disposed at a predetermined position on the support dish 3. Thereby, it becomes possible to prevent a gap exceeding a predetermined fire protection standard from occurring between the front end of the main body portion 11 of the sheet metal member 10 and the left end of the side plate 23 of the sheet metal member 20.

[0028] Also, as shown in FIG. 8, the pressing portion 3f is disposed rearward of the pressing portion 3e. The pressing portion 3f extends in the front-rear direction B, and its upper surface is an inclined surface that slopes downward as it goes from the rear to the front. Also, the front end portion of the pressing portion 3f is arranged at a position where it can press forward the vicinity of the left end of the lower end of the side plate 24 of the enclosure 2 disposed at a predetermined position on the support dish 3. Thereby, it becomes possible to prevent a gap exceeding a predetermined fire protection standard from occurring between the rear end of the main body portion 11 of the sheet metal member 10 and the left end of the side plate 24 of the sheet metal member 20.

[0029] Next, the operation when assembling the power supply unit 1 will be described below. First, prepare the sheet metal member 11 and the power supply board 100. Then, insert the hole portion 15b2 of the vertical portion 15b into the hole 100c at the upper front of the power supply board 100, and insert the hole portion 17b2 of the vertical portion 17b into the hole 100d at the lower rear of the power supply board 100. At this time, fit the slit 100f of the power supply board 100 into the slit 13b1 of the rear portion 13. After that, tighten the screw 8 into the screw holes 15b1, 16b1, and 17b1 of the vertical portions 15b, 16b, and 17b of the sheet metal member 11 to fix the power supply board 100 in a state where it is aligned with the sheet metal member 10.

[0030] Next, as shown in FIG. 4, after fixing the gap filling member 30 to the rear portion 13, combine the sheet metal member 20 with the sheet metal member 10 so as to form an internal space S for housing the power supply board 100. Then, as shown in FIG. 2, tighten the screw 9 into the screw hole 18a. Thus, the enclosure 2 is completed.

[0031] Next, prepare the support dish 3 and arrange the enclosure 2 at a predetermined position of the support dish 3 as shown in FIG. 1. Thus, the power supply unit 1 is completed.

[0032] As described above, according to the enclosure 2 for the power supply board of the present embodiment, since the vertical portions (substrate support portions) 15b to 17b provided on the inner extending portions 15 to 17 of the sheet metal member 10 (the first sheet metal member) face the main body portion 10, it is possible to combine the two sheet metal members 10 and 20 (the other sheet metal member: the second sheet metal member) so that a gap (the gap related to the vertical portions 15b to 17b) exceeding a predetermined fire protection standard does not occur between them. For this reason, it is not necessary to provide a gap filling member for filling the gap, and it is possible to suppress an increase in manufacturing cost.

[0033] The three inner extending portions 15 to 17 are arranged at intervals from each other at the end of the main body portion 11 of the sheet metal member 10. Thereby, it becomes possible to support the power supply board 100 more reliably.

[0034] Since the pressing portions 3e and 3f are formed on the support dish 3, when the enclosure 2 is combined with the support dish 3, displacement of the side plates 23 and 24 so as to open outward is suppressed. Therefore, it is possible to prevent a gap exceeding a predetermined fire protection standard from occurring between the sheet metal member 10 (main body portion 11) and the sheet metal member 20 (side plates 23 and 24). Further, by combining the enclosure 2 with the support dish 3 to form the power supply unit 1, it becomes unnecessary to provide a gap filling member for filling the gaps related to the vertical portions 15b to 17b, and it is possible to obtain a power supply unit capable of suppressing an increase in manufacturing cost.

[0035] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible as long as they are within the scope described in the claims. For example, in the above-described embodiment, the sheet metal member 10 has three inner extending portions 15 to 17, but it may have one or two, or four or more inner extending portions. If it is possible to increase the separation distance between the power supply board 100 and the main body portion 11, or when the power supply board 100 is fixed to the main body portion 11 by a method other than screwing, the recess 19 may not be formed in the main body portion 11.

[0036] The pressing portion 12c may not be formed on the bottom portion (bottom plate) 12. Further, a pressing portion capable of pressing the side plate 24 forward may be formed behind the bottom portion 12 instead of or in addition to the pressing portion 12c. Only one of the two pressing portions 3e and 3f of the support dish 3 may be formed, or neither of them may be formed. The two sheet metal members 10 and 20 may not be fixed by the screw 9. In this case, they may be fixed by other fixing means.

Explanation of Reference Numerals

[0037] 1 Power supply unit 2 Enclosure for power supply board 3 Support dish 3e, 3f Pressing portion 9 Screw 10 Sheet metal member (first sheet metal member) 11 Main body portion Bending parts 11a to 11c, 11e Bottom (bottom plate) 12 Inner extending parts 15 to 17 Vertical parts (substrate support parts) 15b to 17b Screw holes 15b1 to 17b1 Recessed part 19 Sheet metal member (other sheet metal member: second sheet metal member) 20 Opposing plate 21 Top plate 22 Side plates 23, 24 Power supply substrate 100 Internal space S

Claims

1. In a power supply unit configured to support a power supply board, a flat main body portion, a first extending portion, and a second extending portion are provided, the first extending portion is provided with a first board support portion for supporting the power supply board and a first connecting portion connecting the main body portion and the first board support portion, when viewed from a direction orthogonal to the surface of the power supply board facing the main body portion, the main body portion and the first board support portion overlap, the second extending portion is provided with a second board support portion for supporting the power supply board and a second connecting portion connecting the main body portion and the second board support portion, when viewed from a direction orthogonal to the surface of the power supply board facing the main body portion, the main body portion and the second board support portion overlap, the power supply board has a first side and a second side that form an outer shape along a first virtual line passing through its center of gravity and extending in the in-plane direction of the surface, and a third side and a fourth side that form the outer shape along a second virtual line passing through the center of gravity, orthogonal to the first virtual line, and extending in the in-plane direction, the power supply board is provided with a first hole and a second hole, within a region closer to the first side than the first virtual line and closer to the third side than the second virtual line, it is fastened to the first board support portion by a first screw passing through the first hole, within a region closer to the second side than the first virtual line and closer to the fourth side than the second virtual line, it is fastened to the second board support portion by a second screw passing through the second hole, further comprising a support dish for supporting the main body portion, the support dish having one rounded corner, a power supply unit characterized thereby.

2. The power supply unit according to claim 1, characterized in that the direction in which the first connecting portion of the first board support portion extends is different from the direction in which the second connecting portion of the second board support portion extends.

3. The power supply unit according to claim 1, characterized in that the direction in which the first connecting portion of the first board support portion extends intersects the direction in which the second connecting portion of the second board support portion extends.

4. The power supply unit according to claim 1, characterized in that the direction in which the first connecting portion of the first board support portion extends is orthogonal to the direction in which the second connecting portion of the second board support portion extends.

5. In a power supply unit configured to support a power supply board, a flat main body portion, a first extending portion, and a second extending portion are provided, The first extending portion is provided with a first substrate support portion for supporting the power supply substrate and a first connecting portion connecting the main body portion and the first substrate support portion. When viewed from a direction orthogonal to the surface of the power supply substrate facing the main body portion, the main body portion and the first substrate support portion overlap. The second extending portion is provided with a second substrate support portion for supporting the power supply substrate and a second connecting portion connecting the main body portion and the second substrate support portion. When viewed from a direction orthogonal to the surface of the power supply substrate facing the main body portion, the main body portion and the second substrate support portion overlap. The power supply substrate has a first side and a second side that form an outer shape along a first virtual line passing through its center of gravity and extending in the in-plane direction of the surface, and a third side and a fourth side that form the outer shape along a second virtual line passing through the center of gravity, orthogonal to the first virtual line, and extending in the in-plane direction. The power supply substrate includes a first hole and a second hole. Within a region closer to the first side than the first virtual line and closer to the third side than the second virtual line, it is fastened to the first substrate support portion by a first screw passing through the first hole. Within a region closer to the second side than the first virtual line and closer to the fourth side than the second virtual line, it is fastened to the second substrate support portion by a second screw passing through the second hole. It further includes a bottom plate for supporting the main body portion. The bottom plate has one rounded corner, and the power supply unit is characterized by this.

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