JP2019016751A - Electronic device and electronic power conversion device - Google Patents

Abstract

To provide an electronic device which can secure a proper distance between a rod-like object and electronic components even when the rod-like object enters from an air outlet and reduce pressure loss of the air outlet.SOLUTION: An electronic device includes: a housing 2; a fan 6 incorporated into the housing; and multiple electronic components including a heating electronic component housed within the housing. Flow of cooling air from an air inlet 4 formed on a first side wall 2b of the housing to an air outlet 3 formed on a second side wall 2a of the housing is generated at the interior of the housing by driving of the fan to cool the heating electronic component. A protection plate 7 formed with multiple vent holes 24 through which the cooling air passes toward the air outlet is disposed at the interior part of the housing which is located close to the second side wall. When a rod-like object enters from the air outlet, the protection plate inhibits a tip of the rod-like object from contacting with the electronic components.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic device and a power conversion device in which a fan for bringing cooling air into contact with an electronic component that generates heat is housed in a housing.

  In the electronic device of Patent Document 1, a circuit board on which a plurality of electronic components including a heat generating electronic component are mounted, a cylindrical heat sink, and a fan are housed in a housing, and the heat sink is placed on the substrate. It is installed and a fan is connected to the heat sink intake. When the fan is driven, the cooling air that has entered the heat sink intake port from the outside of the housing passes through the ventilation path of the heat sink and is blown out through an exhaust port provided in the housing opposite to the intake port.

In the device of Patent Document 1, air that has passed through the inside of the housing is difficult to be discharged outside due to pressure loss caused by a plurality of air holes provided in the exhaust port of the housing.
Although the pressure loss can be reduced by increasing the ventilation hole of the exhaust port, for example, when this device is applied to an automobile, there is a possibility that the protection standard for automobile parts may not be satisfied.
Non-Patent Document 1 defines protection against foreign objects, water, and access to a protective structure for electronic components arranged inside a housing of an automobile electrical device.

In this non-patent document 1, as a requirement when the first characteristic number and additional characters of the international protection code are “XC”, the entire test probe having a diameter of 2.5 mm and a length of 100 mm may invade. It stipulates that an appropriate distance must be secured between dangerous places.
A test probe is a rod-shaped object such as a wire, for example. Even if the rod-shaped object such as a wire penetrates into the inside of the housing, an appropriate distance from the dangerous part (electronic component) is secured. It stipulates that it must be.

Japanese Patent No. 4655987

Japanese Industrial Standard JIS D 5020

  Therefore, the present invention can secure an appropriate distance from the electronic component even if a rod-like object such as a wire enters from the air exhaust port, and reduces the pressure loss of the air exhaust port, An object of the present invention is to provide an electronic device and a power conversion device that can use a small and inexpensive fan.

  In order to achieve the above object, an electronic device according to one embodiment of the present invention includes a housing, a fan incorporated in the housing, and a plurality of electronic devices including a heat generating electronic component housed in the housing. And parts. The heat generating component is generated by generating a cooling air flow from the air intake port formed on the first side wall of the housing to the air outlet port formed on the second side wall of the housing by driving the fan. Has been cooled. A plurality of ventilation holes through which cooling air passes toward the air discharge port are formed inside the casing near the second side wall, and when the rod-shaped object enters from the air discharge port, A protective plate for preventing the tip from coming into contact with the electronic component is disposed.

Here, the specific shapes of the air discharge port formed in the second side wall and the vent port formed in the protective plate are a plurality of horizontally long slits whose major axis direction extends in the horizontal direction, or a plurality of circular shapes and polygons. Shaped hole.
In addition, a power conversion device according to one embodiment of the present invention is a device that includes the electronic device described above and converts DC power into AC power.

  According to the electronic device and the power conversion device according to the present invention, even if a rod-like object enters from the air exhaust port, an appropriate distance can be secured between the electronic component and the pressure loss at the exhaust port is reduced. Thus, a small and inexpensive fan can be used.

It is a perspective view showing the outline of the power converter of a 1st embodiment concerning the present invention. It is a figure which shows one internal structure of the short side of the power converter device of 1st Embodiment. It is a perspective view which shows the outline of the power converter device of 2nd Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 2nd Embodiment. It is a perspective view which shows the outline of the power converter device of 3rd Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 3rd Embodiment. It is a perspective view which shows the outline of the power converter device of 4th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 4th Embodiment. It is a perspective view which shows the outline of the power converter device of 5th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 5th Embodiment. It is a figure which shows the shape of the protection board of the power converter device of 5th Embodiment. It is a perspective view which shows the outline of the power converter device of 6th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 6th Embodiment. It is a figure which shows the shape of one side wall by the side of the short side of each embodiment which concerns on this invention. It is a figure which shows the other shape of one side wall of the short side of each embodiment which concerns on this invention. It is a perspective view which shows the outline of the power converter device of 7th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 7th Embodiment. It is a perspective view which shows the outline of the power converter device of 8th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 8th Embodiment. It is a perspective view which shows the outline of the power converter device of 9th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 9th Embodiment. It is a perspective view which shows the outline of the power converter device of 10th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 10th Embodiment. It is a perspective view which shows the outline of the power converter device of 11th Embodiment which concerns on this invention. It is a figure which shows one internal structure of the short side of the power converter device of 11th Embodiment.

  Next, first to eleventh embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  Further, the following first to eleventh embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material of the component, The shape, structure, arrangement, etc. are not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[Power Converter of First Embodiment]
Hereinafter, a first embodiment of a power conversion device including an electronic device according to the present invention will be described with reference to FIGS. 1 and 2. In addition, terms indicating directions such as “top”, “bottom”, “bottom”, “front”, “back” and the like described in the following description are used with reference to the directions of the attached drawings.
The power conversion device 1 according to the first embodiment is a device that is used as a DC / AC converter. The power conversion device 1 is a bottomed box-shaped case 2 made of a metal plate that is rectangular in plan view, and the upper opening of the case 2 is closed. And a lid (reference numeral 8 in FIG. 2).

  A plurality of ventilation holes 3 communicating with the side wall 2a in the thickness direction of the side wall 2a are formed on one (right side) side wall 2a on the short side of the case 2. The plurality of ventilation holes 3 are horizontally long slits whose long axis direction extends to the side walls 2d and 2e on the long side of the case 2 and a plurality of adjacent holes are adjacent to each other in the short axis direction (hereinafter, a plurality of horizontally long holes). (Referred to as slit 3). A plurality of these horizontally long slits 3 are formed on the side walls 2d and 2e on the long side.

As shown in FIG. 1, a plurality of ventilation holes 4 are also formed in the other side (left side) side wall 2 b on the short side of the case 2.
In the power converter 1 of the first embodiment, when a control signal is input to a control connector (not shown), DC power input to the input connector (not shown) is converted from DC to AC by a power conversion control unit described later. And output as AC power from an output connector (not shown).

Inside the case 2, a power conversion control unit, a heat sink 5, a fan 6 and a protection plate 7 are arranged.
The power conversion control unit includes a circuit board 10, a reactor 11, a first electrolytic capacitor 12, a second electrolytic capacitor 13, a third electrolytic capacitor 14 (see FIG. 2), a transformer 15, choke coils 16, 17 and a plurality of semiconductor devices ( For example, it has a control component such as a MOS-FET 18.

The circuit board 10 has a rectangular shape smaller than the planar shape of the bottom plate 2c of the case 2, and is fixed on a support base (not shown) formed on the upper surface of the bottom plate 2c.
A reactor 11, a first electrolytic capacitor 12, a second electrolytic capacitor 13, a third electrolytic capacitor 14, a transformer 15, choke coils 16, 17 and a plurality of semiconductor devices 18 are mounted on the circuit board 10, and a heat sink. 5 is fixed.

The heat sink 5 is a rectangular parallelepiped member having a high thermal conductivity, for example, formed by extruding aluminum or an aluminum alloy.
A plurality of ventilation paths are formed in parallel between an air intake port (not shown) at one end of the heat sink 5 on the fan 6 side and an air outlet port 19 at the other end.
The fan 6 is integrally fixed to the heat sink 5 so as to cover the air intake port.

The choke coils 16 and 17 are mounted on the circuit board 10 near the air outlet 19 of the heat sink 5. On one side wall 2 a side of the choke coils 16 and 17, a flat coil protection plate 20 is provided so as to rise from the circuit board 10.
The transformer 15 is mounted on the circuit board 10 near one side wall of the heat sink 5.

The plurality of semiconductor devices 18 are mounted on the circuit board 10 in contact with one side wall of the heat sink 5.
The first electrolytic capacitor 12 is mounted on the circuit board 10 at a position facing the other side wall of the heat sink 5. The second electrolytic capacitor 13 is mounted on the circuit board 10 at a position facing one side wall of the heat sink 5. Further, the third electrolytic capacitor 14 is mounted on the circuit board 10 at a position near one side wall 2a on the short side of the case 2 where a large number of ventilation holes are formed.

As shown in FIG. 2, the protective plate 7 is provided at the first flat plate 21 and the second flat plate 22 formed by bending the short direction of the long plate material into an L shape, and at both ends in the longitudinal direction of the first flat plate 21. This is a member provided with a case fixing portion 23.
The protective plate 7 has a first flat plate 21 extending to the choke coils 16, 17 side perpendicular to the inner surface of the side wall 2 a at approximately half the height of the one side wall 2 a, and the second flat plate 22 being one of the side walls 2 a. The case fixing portion 23 is fixed to the side walls 2d and 2e on the long side of the case 2 so as to face the side walls 2a in parallel.

  A plurality of ventilation holes 24 communicating with the first flat plate 21 in the thickness direction of the first flat plate 21 are formed in the first flat plate 21. The plurality of ventilation holes 24 have slits (hereinafter referred to as first protective slits 24) in which the long axis direction extends to the side walls 2d and 2e on the long side of the case 2 and the plural holes are adjacent in the short axis direction. Called). A plurality of sets of the plurality of first protective slits 24 are formed on the side walls 2d and 2e on the long side.

Further, the second flat plate 22 has no ventilation hole.
Here, the power converter device 1 of 1st Embodiment has a structure corresponding to the protection standard with respect to the approach of the foreign material regarding the electric device for motor vehicles described in the nonpatent literature 1 mentioned above.
In Non-Patent Document 1, a test probe having a diameter D = 2.5 mm and a length L = 100 mm (reference symbol PBa in FIG. 2) is used as an approach when the first and second characteristic numbers and additional characters of the code are “XC”. , PBb) may enter the power converter 1, but it is defined that an appropriate distance must be ensured between the dangerous part and the power converter. That is, in the power conversion device 1 of the first embodiment, a part of the power conversion control unit (for example, the choke coils 16 and 17 and the third electrolysis unit) in which the test probes PBa and PBb that have entered the case 2 are arranged in the case 2 is used. An appropriate distance from the capacitor 14) must be secured.

In the first embodiment, the side wall 2a on the short side of the case 2 and the plate thickness of the protective plate 7 are set to the same dimension T (mm).
The width in the short axis direction of the horizontally long slit 3 formed in the side wall 2a and the width in the short axis direction of the first protective slit 24 formed in the first flat plate 21 of the protective plate 7 are set to the same dimension H (mm). Has been.

Here, when the viewing angle from the horizontally long slit 3 of the side wall 2a to the first protective slit 24 of the protective plate 7 is set to 45 ° (as shown in FIG. 2, the test probe PBa is inserted from the horizontally long slit 3 of the side wall 2a. The gap in the short axis direction for passing through both the horizontally long slit 3 and the first protective slit 24 is maximized.
In the first embodiment, the width H in the minor axis direction of the horizontally long slit 3 and the first protective slit 24 is set to the following expression (1).
H <T + D√2 (1)

  As shown in FIG. 2, by setting the width H in the minor axis direction of the horizontally long slit 3 and the first protective slit 24 to a value lower than the value of (T + D√2) as shown in the equation (1), Even if PBa is inserted at an angle of 45 ° from the horizontally long slit 3 of the side wall 2a, the tip of the test probe PBa does not pass through the first protective slit 24 of the protective plate 7 and is properly connected to the third electrolytic capacitor 14. Secure the distance.

When a test probe PBb having a diameter D = 2.5 mm and a length L = 100 mm is inserted into the horizontally elongated slit 3 in a direction orthogonal to the side wall 2a, the tip of the test probe PBb is the second flat plate 22 of the auxiliary plate 7. Therefore, the test probe PBb secures an appropriate distance between the choke coils 16 and 17.
The housing described in the present invention corresponds to the case 2, the air discharge port described in the present invention corresponds to the horizontally long slit, and the protective large-diameter vent described in the present invention is the first. This corresponds to one protective slit 24.

Next, operation | movement of the power converter device 1 of 1st Embodiment is demonstrated.
In the power conversion device 1 of this embodiment, when a control signal is input to the control connector, the DC power input to the input connector is converted into AC by the power conversion control unit, and is output as AC power from the output connector.
At this time, control components such as the power conversion control unit in the case 2 generate heat, and in particular, the self-heating of the plurality of semiconductor devices 18 and the choke coils 16 and 17 increases.

In the power conversion device 1, when the fan 6 is driven, the cold air taken in from the outside through the ventilation holes 4 of the case 2 enters the plurality of ventilation paths of the heat sink 5 through the air intake and blows out from the air outlet 19. . Then, the cold air blown out from the air outlet 19 of the heat sink 5 goes toward the side wall 2 a of the case 2.
Here, in the first embodiment, the fan 6 is arranged inside the case 2, but the structure in which the fan 6 is externally attached to the outside of one side wall 2a of the case 2 or a large opening on one side wall 2a. And the fan 6 may be fitted into the opening.

The cold air toward the side wall 2a passes through the plurality of horizontally long slits 2a below the side wall 2a and is discharged to the outside of the case 2, and the side wall after passing through the plurality of first protective slits 24 of the protective plate 7 The flow is divided into flows that pass through the horizontally long slit 3 on the upper side of 2a and are discharged to the outside of the case 2.
As the cold air flows through the plurality of ventilation paths of the heat sink 5, the temperature of the heat sink 5 decreases, and the plurality of semiconductor devices 18 mounted on the circuit board 10 are cooled in contact with the side walls of the heat sink 5. .

Further, when the cool air blows out from the air blowing port 19, the cold air directly contacts the choke coils 16 and 17 mounted on the circuit board 10 near the air blowing port 19, and the choke coils 16 and 17 are cooled. Go.
Next, the effect of the power converter device 1 of 1st Embodiment is demonstrated.
A first flat plate 21 of the protection plate 7 is disposed orthogonally on the inner surface of one side wall 2 a on the short side of the case 2, and a second flat plate 22 extending in an L shape with respect to the first flat plate 21 is provided. It arrange | positions facing the inner surface of the side wall 2a in parallel. A plurality of horizontally long slits 3 are formed on the side wall 2 a, and a plurality of first protective slits 24 are formed on the first flat plate 21.

With this structure, even when a rod-like object such as a wire (test probes PBa and PBb having a diameter D = 2.5 mm and a length L = 100 mm) is inserted from the horizontally long slit 3 on the side wall 2a, the tip of the rod-like object is protected. By contacting either the first flat plate 21 or the second flat plate 22 of the plate 7, the tip of the rod-shaped object does not enter the inside of the case 2.
Here, the diameter of a rod-like object such as a wire is D (mm), the thickness of the side wall 2a and the protective plate 7 is the same dimension T (mm), and the width in the minor axis direction of the horizontally long slit 3 formed in the side wall 2a. And the width H in the minor axis direction of the first protective slit 24 formed in the first flat plate 21 is the same dimension H (mm), the width H in the minor axis direction of the laterally long slit 3 and the first protective slit 24 is By setting the value lower than the value of (T + D√2), an appropriate distance can be secured between the rod-like object such as a wire and the choke coils 16 and 17 and the third electrolytic capacitor 14.

  Further, since the opening area of the plurality of horizontally long slits 3 formed on the side wall 2a and the opening area of the plurality of first protection slits 24 formed on the first flat plate 21 of the protection plate 7 orthogonal to the side wall 2a are increased as much as possible. The pressure loss of the cold air discharged to the outside from the horizontally long slit 3 on the side wall 2a is reduced. As a result, the fan 6 can be downsized, and an inexpensive fan 6 with a low static pressure can be used.

[Power Converter of Second Embodiment]
Next, a power converter provided with the electronic device of 2nd Embodiment is demonstrated with reference to FIG.3 and FIG.4. In addition, the same component as the power converter device 1 of 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.
In the power conversion device 1 of the second embodiment, a plurality of second protective slits 30 communicating in the thickness direction are formed on the second flat plate 22 of the protective plate 7 facing the side wall 2a of the case 2 in parallel. Has been.

The plurality of second protection slits 30 extend in the long axis direction to the side walls 2d and 2e on the long side of the case 2, and a plurality of the second protection slits 30 are adjacent to each other in the short axis direction. A plurality of sets of the plurality of second protective slits 30 are formed on the side walls 2d and 2e on the long side.
The width H1 in the minor axis direction of the second protective slit 30 is a diameter D = 2.5 mm, which is shown in Non-Patent Document 1 as a requirement when the first characteristic numeral and additional characters of the international protective code are “XC”, and long. The length L is set to be smaller than the diameter D of the test probe of 100 mm (H1 <D).
The air discharge port described in the present invention corresponds to the horizontally long slit, the protective large-diameter vent described in the present invention corresponds to the first protective slit 24, and the protection described in the present invention. The small-diameter vent for use corresponds to the second protective slit 30.

  According to the power conversion device 1 of the second embodiment, a rod-like object (test probe PBa, PBb having a diameter D = 2.5 mm and a length L = 100 mm) such as a wire is transferred from the horizontally long slit 3 on the side wall 2a to the protective plate 7. When the second flat plate 22 is inserted, the second protective slit 30 having a width H1 smaller than the diameter D of the rod-shaped object is formed, so that the rod-shaped object does not enter the case 2 from the second flat plate 22. An appropriate distance can be secured between the choke coils 16 and 17.

  Further, since the opening area of the protective plate 7 in which the plurality of second protective slits 30 are formed on the second plane 22 is further increased as compared with the first embodiment, the cold air discharged to the outside from the horizontally long slit 3 of the side wall 2a. The pressure loss is further reduced. Thereby, it is possible to further reduce the size of the fan 6 and provide an inexpensive fan 6 having a low static pressure.

[Power Converter of Third Embodiment]
Next, a power converter provided with the electronic device of 3rd Embodiment is demonstrated with reference to FIG.5 and FIG.6.
In the power conversion device 1 of the third embodiment, a power conversion control unit, a heat sink 5, a fan 6, and a protection plate 31 are arranged inside a case 2.

The protection plate 31 is a member including a rectangular inclined plate 32 and case fixing portions 33 provided at both ends in the longitudinal direction of the inclined plate 32.
The protective plate 31 is inclined so that one edge portion in the short direction of the inclined plate 32 is close to the lower side of the one side wall 2a and is separated from the side wall 2a with a predetermined mounting angle θ. The case fixing portion 33 is arranged and fixed to the side walls 2 d and 2 e on the long side of the case 2.

The inclined plate 32 is formed with a plurality of ventilation holes 34 communicating in the thickness direction. The plurality of ventilation holes 34 are slits in which the long axis direction extends to the side walls 2d and 2e on the long side of the case 2 and a plurality of ventilation holes 34 are adjacent to each other in the short axis direction (hereinafter referred to as a third protective slit). 34). A plurality of sets of the plurality of third protective slits 34 are formed on the side walls 2d and 2e on the long side.
In the third embodiment, the thickness of one side wall 2a on the short side of the case 2 and the protective plate 31 are set to the same dimension T (mm).

The width in the short axis direction of the horizontally long slit 3 formed in the side wall 2a and the width in the short axis direction of the third protective slit 34 formed in the protective plate 31 are set to the same dimension H3 (mm).
Here, when the peeping angle from the horizontally long slit 3 of the side wall 2a to the third protective slit 34 of the protective plate 31 is 1/2 of the mounting angle θ described above (as shown in FIG. 6, the test probe PBa is attached to the side wall 2a. The gap in the minor axis direction for passing through both the horizontal slit 3 and the third protective slit 34 is maximized.

When the test probes PBa and PBb having a diameter D = 2.5 mm and a length L = 100 mm are used, in the third embodiment, the width H3 in the short axis direction of the horizontally long slit 3 and the third protective slit 34 is set as follows: (2) is set to the equation.
H3 <T x tan (θ / 2) + D / cos (θ / 2) (2)

  As shown in the equation (2), the width H3 in the minor axis direction of the horizontally long slit 3 and the third protective slit 34 is a numerical value lower than the value of (T × tan (θ / 2) + D / cos (θ / 2)). Thus, as shown in FIG. 6, even if the test probe PBa is inserted from the horizontally long slit 3 of the side wall 2a, the tip of the test probe PBa does not pass through the third protective slit 34 of the protective plate 31, and the third electrolysis is performed. An appropriate distance from the capacitor 14 is secured.

Further, even if a test probe PBb having a diameter D = 2.5 mm and a length L = 100 mm is inserted into the horizontally elongated slit 3 in a direction orthogonal to the side wall 2a, the tip of the test probe PBb is the third of the protection plate 31. The test probe PBb ensures an appropriate distance between the choke coils 16 and 17 without passing through the protective slit 34.
The protective large-diameter vent described in the invention corresponds to the third protective slit 34.

According to the power conversion device 1 of the third embodiment, even if a rod-like object (diameter D = 2.5 mm, test probe PBa, PBb having a length L = 100 mm) such as a wire is inserted from the horizontally long slit 3 of the side wall 2a. The tip of the bar-shaped object such as a wire contacts the inclined plate 32 of the protection plate 31 so that the tip of the bar-shaped object does not enter the inside of the case 2.
Here, the diameter of a bar-like object such as a wire is D (mm), the attachment angle of the inclined plate 32 of the side wall 2a and the protection plate 31 is θ (°), and the thickness of the side wall 2a and the protection plate 31 is the same dimension. The width in the minor axis direction of the horizontally long slit 3 formed in the side wall 2a and the width in the minor axis direction of the third protective slit 34 formed in the inclined plate 32 of the protective plate 31 are the same dimension H3 (mm). ), The width H3 in the minor axis direction of the horizontally long slit 3 and the third protective slit 34 is set to a value smaller than the value of (T × tan (θ / 2) + D / cos (θ / 2)). An appropriate distance can be ensured between the rod-like object such as a wire and the choke coils 16 and 17 and the third electrolytic capacitor 14.

  Further, since the opening area of the plurality of horizontally long slits 3 formed on the side wall 2a and the opening area of the third protective slit 34 of the protective plate 31 are increased as much as possible, the cold air discharged to the outside from the horizontally long slit 3 of the side wall 2a Pressure loss is reduced. As a result, the fan 6 can be downsized, and an inexpensive fan 6 with a low static pressure can be used.

[Power Converter of Fourth Embodiment]
Next, a power converter provided with the electronic device of 4th Embodiment is demonstrated with reference to FIG.7 and FIG.8.
In the power conversion device 1 of the fourth embodiment, a power conversion control unit, a heat sink 5, a fan 6, and a protection plate 35 are arranged inside a case 2.

On one side (right side) 2a on the short side of the case 2, a large rectangular opening 36 extending in the longitudinal direction on the side walls 2d and 2e on the long side is formed.
The protection plate 35 is a member including a rectangular inclined plate 37 and case fixing portions 38 provided at both ends in the longitudinal direction of the inclined plate 37.
The inclined plate 37 is formed with a plurality of fourth protective slits 39 communicating with the plate thickness direction. The plurality of fourth protective slits 39 are slits in which the long axis direction extends to the side walls 2d and 2e on the long side of the case 2 and a plurality of fourth protective slits 39 are adjacent to each other in the short axis direction. A plurality of sets of the plurality of fourth protective slits 39 are formed on the side walls 2d and 2e on the long side.

The width H4 in the minor axis direction of the plurality of fourth protective slits 39 is set to be smaller than the diameter D of a bar-like object (diameter D = 2.5 mm, length L = 100 mm test probes PBa, PBb). (H4 <D).
The protective plate 35 is provided with an inclined plate 37 with one edge in the short direction of the inclined plate 37 being close to the lower side of the side wall 2a and being inclined upward at a predetermined mounting angle as it is separated from the side wall 2a. The case fixing portion 38 is fixed to the side walls 2d and 2e on the long side of the case 2.
The air outlet on the second side wall described in the present invention corresponds to the opening 36, and the protective small-diameter vent described in the present invention corresponds to the fourth protective slit 39.

According to the power conversion device 1 of the fourth embodiment, a rod-like object such as a wire (test probes PBa and PBb of a test probe having a diameter D = 2.5 mm and a length L = 100 mm) is inserted from the opening 36 of the side wall 2a. Then, the tip of a bar-like object such as a wire does not pass through the fourth protective slit 39 having a width H4 in the minor axis direction smaller than the diameter D of the bar-like object formed on the inclined plate 37 of the protection plate 35. An appropriate distance can be ensured between the rod-shaped object and the choke coils 16 and 17 and the third electrolytic capacitor 14.
Moreover, since the opening part 36 with a large opening area is formed in the side wall 2a, the pressure loss of the cold wind discharged | emitted from the opening part 36 of the side wall 2a outside can be reduced. Thereby, it is possible to further reduce the size of the fan 6 and provide an inexpensive fan 6 having a low static pressure.

[Power Converter of Fifth Embodiment]
Next, a power converter provided with the electronic device of 5th Embodiment is demonstrated with reference to FIGS.
In the power conversion device 1 of the fifth embodiment, a power conversion control unit, a heat sink 5, a fan 6, and a protection plate 40 are disposed inside a case 2.

On one side (right side) 2a on the short side of the case 2, a large rectangular opening 36 extending in the longitudinal direction on the side walls 2d and 2e on the long side is formed.
The protection plate 40 is a member provided with a rectangular inclined plate 41 and case fixing portions 42 provided at both longitudinal ends of the inclined plate 37.
The inclined plate 41 is formed with a plurality of fifth protective slits 43 communicating in the thickness direction.

  As shown in FIG. 11, the width H5a in the short axis direction of the fifth protective slit 43 formed on one end side in the short direction of the inclined plate 41 is a bar-like object (diameter D = 2.5 mm, length). L = 100 mm) is set smaller than the diameter D (H5a <D). The width of the fifth protective slit 43 in the short axis direction gradually increases from one end side in the short direction of the inclined plate 41 toward the other end side, and is formed on the other end side in the short direction of the inclined plate 41. The width H5b in the minor axis direction of the fifth protective slit 43 is set to be larger than the diameter D of a rod-like object such as a wire (H5b> D). A plurality of sets of the plurality of fifth protective slits 43 are formed on the side walls 2d and 2e on the long side.

In addition, the air discharge port of the 2nd side wall described in this invention respond | corresponds to the opening part 36, the protection board described in this invention respond | corresponds to the inclination board 41, and is for protection as described in this invention The small-diameter vent and the protective large-diameter vent correspond to the fifth protective slit 43.
According to the power converter 1 of the fifth embodiment, when a rod-like object such as a wire is inserted from the opening 36 of the side wall 2a and brought into contact with the protective plate 40 at a substantially right angle (diameter D = 2.5 mm, length L = 100 mm test probe PBa), the tip of the rod-shaped object is in contact with one end side of the inclined plate 41 of the protection plate 40 in the short direction, and the width in the short axis direction is H5a (H5a <D). Therefore, an appropriate distance can be ensured between the choke coils 16 and 17 and the third electrolytic capacitor 14.

When the tip of the rod-shaped object is brought into contact with the other end in the short direction of the inclined plate 41 of the protective plate 40 (test probe PBb having a diameter D = 2.5 mm and a length L = 100 mm), the tip of the rod-shaped object is Since the width of the minor axis is H5b (H5b> D) and contacts the edge of the fifth protective slit 43 and does not pass through the inside, an appropriate distance between the choke coils 16 and 17 and the third electrolytic capacitor 14 Can be secured.
Since the inclined plate 41 is formed with a plurality of fifth protective slits 43 whose width in the short axis direction is increased from one end side in the short direction toward the other end side, as compared with the fourth embodiment. Thus, the pressure loss of the cold air discharged to the outside can be further reduced.

[Power Converter of Sixth Embodiment]
Next, a power converter provided with the electronic device of 6th Embodiment is demonstrated with reference to FIG.12 and FIG.13.
In the power conversion device 1 of the sixth embodiment, a power conversion control unit, a heat sink 5, a fan 6, and a protection plate 50 are arranged inside a case 2.

As shown in FIG. 13, the protective plate 50 includes first to fourth flat plates 51 to 54 formed by bending the short direction of the long plate material in a step shape at right angles, and both longitudinal ends of the first flat plate 51. It is a member provided with the case fixing | fixed part 55 provided.
The first flat plate 51 of the protection plate 50 extends to the side of the choke coils 16 and 17 at a position approximately half the height of one side wall 2a, perpendicular to the inner surface of the side wall 2a, and the second flat plate 52 extends to the side wall 2a. The third flat plate 53 extends from the upper end of the second flat plate 52 to the side of the choke coils 16 and 17 from the upper end of the second flat plate 52, and the fourth flat plate 54 extends to the side of the lid 8. 52 extends to the lid 8 side in parallel to the side wall 2a.

The first to fourth flat plates 51 to 54 are provided with sixth to ninth protective slits 56 to 59 whose major axis direction extends to the side walls 2d and 2e on the long side of the case 2, respectively. Are formed in the long and short directions.
The width H in the minor axis direction of the sixth protective slit 56 of the first flat plate 51 is the same as the width H of the horizontally elongated slit 3 formed in the side wall 2a, and is the same as the above-described equation (1) of the first embodiment. The width H in the minor axis direction of the horizontally long slit 3 and the first protective slit 24 is set to a numerical value lower than the value of (T + D√2).

Further, the width H6 in the minor axis direction of the seventh protective slit 57 of the second flat plate 52 and the width H8 in the minor axis direction of the ninth protective slit 59 of the fourth flat plate 54 are each a rod-like object (diameter D = 2.5 mm, length L = 100 mm) is set smaller than the diameter D (H6 <D, H8 <D).
Further, the width H7 in the minor axis direction of the eighth protective slit 58 of the third flat plate 53 disposed in the vicinity of the lid 8 is set to be larger than the diameter D described above (H7> D).

In addition, the air discharge port of the 2nd side wall described in this invention respond | corresponds to the horizontally long slit 3, and the large diameter vent for protection described in this invention is in the 6th protective slit 56 and the 8th protective slit 68. Correspondingly, the protective small-diameter vent described in the present invention corresponds to the seventh protective slit 57 and the ninth protective slit 59.
According to the power conversion device 1 of the sixth embodiment, a rod-like object (a test probe PBa having a diameter D = 2.5 mm and a length L = 100 mm) such as a wire is formed from the horizontally long slit 3 on the side wall 2a. Even if it is inserted toward the one flat plate 51, the tip of the rod-shaped object does not enter the inside of the case 2 by contacting the edge of the sixth protective slit 56 of the first flat plate 51.

Further, even if a rod-like object (test probe PBb) such as a wire is inserted from the laterally long slit 3 of the side wall 2a toward the second flat plate 52, the tip of the rod-like object does not pass through the seventh protective slit 57. The tip of the object does not enter the case 2.
Further, even if a rod-like object (test probe PBc) such as a wire is inserted from the laterally long slit 3 of the side wall 2a toward the fourth flat plate 54, the tip of the rod-like object does not pass through the ninth protective slit 59. The tip of the object does not enter the case 2.

Therefore, the power converter 1 of the sixth embodiment can also ensure an appropriate distance between the rod-like object such as a wire and the choke coils 16 and 17 and the third electrolytic capacitor 14.
Moreover, the protective plate 50 arrange | positioned inside the case 2 of the power converter device 6 of 6th Embodiment is 6th-all on the 1st-4th flat plates 51-54 formed by bending at right angles to the step shape. Since the ninth protective slits 56 to 59 are formed to increase the opening area, the pressure loss of the cold air discharged to the outside from the horizontally long slit 3 on the side wall 2a is reduced. Thereby, it is possible to further reduce the size of the fan 6 and provide an inexpensive fan 6 having a low static pressure.

[Ventilation hole shape of power converter]
Here, in the side wall 2a of the power converter device 1 of 1st-3rd embodiment shown in FIGS. 1-6, and the side wall 2a of the power converter device 1 of 6th Embodiment shown in FIG.12 and FIG.13, A plurality of horizontally long slits 3 were formed as ventilation holes. However, the gist of the present invention is not limited to the plurality of horizontally long slits 3 in the side walls 2a for discharging the cold air from the inside of the power conversion device 1 to the outside.

For example, as shown in FIGS. 14A and 14B, a punching board having a large number of circular through-holes 9a may be used as the side wall 2a so that a large number of circular through-holes 9a can be used as ventilation holes. Further, as shown in FIGS. 15A and 15B, by using a punching board having a large number of polygonal through holes 9b as the side wall 2a, a large number of polygonal through holes 9b can be used as ventilation holes. Good.
Similarly, circular through holes 9a and polygonal through holes 9b as shown in FIGS. 14 and 15 are also formed on the protective plates 7, 31, 35, 40, and 50 shown in the first to sixth embodiments. Also good.

[Power Converters of Seventh and Eighth Embodiments]
Moreover, a power converter provided with the electronic device of 7th, 8th embodiment is demonstrated with reference to FIGS. 16-19.
First, as shown in FIGS. 16 and 17, the power converter 1 of the seventh embodiment has a plurality of horizontally long slits 3 formed on one side wall 2 a on the short side of the case 2. A louver 60 is provided outside the side wall 2 a so as to cover the opening from the upper edge of the horizontally long slit 3. The air outlet on the second side wall described in the present invention corresponds to the horizontally long slit 3.

  According to the power conversion device 1 of the seventh embodiment, when a rod-like object such as a wire (test probe PBc of a test probe having a diameter D = 2.5 mm and a length L = 100 mm) is inserted from the horizontally long slit 3 on the side wall 2a, The rod-like object PBc such as a wire does not enter the direction in which the choke coils 16 and 17 and the third electrolytic capacitor 14 are disposed by engaging with the louver 60 provided on the upper edge of the horizontally long slit 3. An appropriate distance can be ensured between the electronic component.

Further, since the protective plate is not disposed inside the side wall 2a, the pressure loss of the cold air discharged to the outside from the horizontally long slit 3 of the side wall 2a can be reduced. Thereby, it is possible to further reduce the size of the fan 6 and provide an inexpensive fan 6 having a low static pressure.
Moreover, as shown in FIGS. 18 and 19, the power conversion device 1 of the eighth embodiment has a plurality of horizontally long slits 3 formed on one (right side) side wall 2 a on the short side of the case 2. A louver 61 is provided inside the side wall 2 a so as to cover the opening from the lower edge of the horizontally long slit 3. The air outlet on the second side wall described in the present invention corresponds to the horizontally long slit 3.

  Also in the power converter 1 of the eighth embodiment, the rod-like object PBc inserted from the horizontally long slit 3 on the side wall 2a is engaged with the louver 61 provided on the lower edge of the horizontally long slit 3 so that the choke coils 16, 17 and the It does not penetrate in the direction in which the three electrolytic capacitors 14 are arranged, and an appropriate distance can be ensured between the electronic components. Further, since the protective plate is not disposed on the side wall 2a, the fan 6 can be downsized and the inexpensive fan 6 having a low static pressure can be provided.

[Power Converters of Ninth, Tenth and Eleventh Embodiments]
Furthermore, a power converter provided with the electronic device of 9th, 10th, and 11th embodiment is demonstrated with reference to FIGS.
First, as shown in FIGS. 20 and 21, in the power converter 1 of the ninth embodiment, a part of the side wall 2 a of the case 2 bulges outside the case 2, and a bulging bottom wall 62 and a bulging side wall are formed. 63 is formed.

A plurality of horizontally long slits 64 are formed in the bulging bottom wall 62 and the bulging side wall 63. The long slit 64 extends in the long axis direction on the side walls 2d and 2e on the long side of the case 2, and a plurality of the long slits 64 are adjacent in the short axis direction.
The widths H9 and H10 in the short axis direction of the horizontally long slits 64 are set smaller than the diameter D of a rod-like object such as a wire (diameter D = 2.5 mm, length L = 100 mm test probe) (H9 < D, H10 <D).

Note that the air discharge port on the second side wall smaller than the diameter of the rod-like object described in the invention corresponds to the horizontally long slit 64.
According to the power conversion device 1 of the ninth embodiment, since a rod-like object such as a wire does not enter from the bulging bottom wall 62 of the side wall 2a and the bulging side wall 63, the choke coils 16 and 17 inside the case 2 An appropriate distance from the third electrolytic capacitor 14 can be ensured.

  Moreover, the area of the side wall 2a increases because a part of the side wall 2a bulges outward to form the bulging bottom wall 62 and the bulging side wall 63. By forming the horizontally long slit 64 in the side wall having an increased area in this way, the discharge area of air from the inside of the case 2 increases, and the pressure loss of the cold air discharged to the outside of the case 2 can be reduced. it can. Therefore, it is possible to provide an inexpensive fan 6 with a small static pressure and a low static pressure.

Moreover, as shown in FIGS. 22 and 23, in the power converter 1 of the tenth embodiment, a part of the side wall 2a of the case 2 is recessed inside the case 2, and the recessed bottom wall 65 and the recessed side wall 66 are provided. Is formed.
A plurality of horizontally long slits 67 are formed in the recessed bottom wall 65 and the recessed side wall 66. The long slit 67 extends in the long axis direction on the side walls 2d and 2e on the long side of the case 2, and a plurality of the horizontally long slits 67 are adjacent to each other in the short axis direction.

The widths H11 and H12 in the short axis direction of the horizontally long slit 67 are set smaller than the diameter D of a rod-like object (diameter D = 2.5 mm, length L = 100 mm test probe) such as a wire (H11 < D, H12 <D).
Note that the air discharge port on the second side wall smaller than the diameter of the rod-like object described in the invention corresponds to the horizontally long slit 67.

According to the power conversion device 1 of the tenth embodiment, since a rod-like object such as a wire does not enter from the recessed bottom wall 65 and the recessed side wall 66 of the side wall 2a, the choke coils 16 and 17 inside the case 2 and the third electrolytic capacitor A proper distance can be ensured between the two.
Moreover, the area of the side wall 2a increases because the bottom wall 65 and the concave side wall 66 are formed by denting a part of the side wall 2a inward. By forming the horizontally long slit 67 in the side wall having an increased area in this way, the discharge area of air from the inside of the case 2 increases, and the pressure loss of the cold air discharged to the outside of the case 2 can be reduced. it can. Therefore, it is possible to provide an inexpensive fan 6 with a small static pressure and a low static pressure.

Furthermore, in the power converter 1 of the eleventh embodiment, as shown in FIGS. 24 and 25, a part of the side wall 2a of the case 2 is continuously formed in a part recessed in the case 2 and a part bulging out in the outside. An uneven wall surface 68 is formed.
A plurality of horizontally long slits 69 are formed in the uneven wall surface 68. The long slit 69 extends in the long axis direction on the side walls 2d and 2e on the long side of the case 2, and a plurality of the long slits 69 are adjacent to each other in the short axis direction.

The width H13 in the short axis direction of the horizontally long slit 69 is also set smaller than the diameter D of a rod-like object (diameter D = 2.5 mm, length L = 100 mm test probe) such as a wire (H13 <D, H12 <D).
Note that the air discharge port on the second side wall, which is smaller than the diameter of the rod-like object described in the invention, corresponds to the horizontally long slit 69.

According to the power conversion device 1 of the eleventh embodiment, since a rod-like object such as a wire does not enter from the uneven wall surface 68 of the side wall 2a, it is between the choke coils 16 and 17 and the third electrolytic capacitor 14 inside the case 2. An appropriate distance can be secured.
Moreover, the area of the side wall 2a increases by forming the uneven | corrugated wall surface 68 in a part of the side wall 2a. By forming the horizontally long slit 69 in the side wall having an increased area in this way, the discharge area of the air from the inside of the case 2 increases, and the pressure loss of the cold air discharged to the outside of the case 2 can be reduced. it can. Therefore, it is possible to provide an inexpensive fan 6 with a small static pressure and a low static pressure.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Case 2a, 2b Short side wall 2c Bottom plate 2d, 2e Long side wall 3 Horizontal slit 4 Ventilation hole 5 Heat sink 6 Fan 7 Protection plate 8 Lid 10 Circuit board 11 Reactor 12 First electrolytic capacitor 13 Second electrolytic capacitor 14 Third electrolytic capacitor 15 Transformers 16, 17 Choke coil 18 Semiconductor device 19 Air outlet 20 Flat coil protection plate 21 First flat plate 22 Second flat plate 23 Case fixing portion 24 First protective slit 30 Second Protective slit 31 Protective plate 32 Inclined plate 33 Case fixing portion 34 Third protective slit 35 Protective plate 36 Opening portion 37 Inclined plate 38 Case fixing portion 39 Fourth protective slit 40 Protective plate 41 Inclined plate 42 Case fixing portion 43 Fifth protective slit 50 Protection plates 51-54 First to fourth flat plates 56 to 59 Sixth to ninth protection slots Preparative 60,61 louvers 62 dents bulged bottom wall 63 bulging sidewall 64 Horizontal slits 65 recessed bottom wall 66 side wall 67 Horizontal slits 68 uneven wall 69 Horizontal slit

Claims (11)

A housing, a fan incorporated in the housing, and a plurality of electronic components including a heat generating electronic component housed in the housing,
When the fan is driven, a flow of cooling air from the air intake port formed on the first side wall of the housing to the air outlet port formed on the second side wall of the housing is generated inside the housing. The heat generating electronic component is cooled;
A plurality of ventilation holes through which the cooling air passes toward the air discharge port are formed inside the casing near the second side wall, and the rod-shaped object enters when the rod-shaped object enters from the air discharge port. An electronic device in which a protective plate for preventing the tip of the wire from contacting the electronic component is disposed. A plurality of air outlets on the second side wall having a shape larger than the diameter of the rod-shaped object,
The protective plate includes a first flat plate and a second flat plate bent in an L-shape, the first flat plate is disposed perpendicular to the second side wall, and the second flat plate is parallel to the second side wall. Are placed opposite each other,
On the first flat plate, a plurality of protective large-diameter vents are formed in a shape larger than the diameter of the rod-shaped object,
The electronic device according to claim 1, wherein a vent hole is not formed in the second flat plate. A plurality of air outlets on the second side wall having a shape larger than the diameter of the rod-shaped object,
The protective plate includes a first flat plate and a second flat plate bent in an L-shape, the first flat plate is disposed perpendicular to the second side wall, and the second flat plate is parallel to the second side wall. Are placed opposite each other,
On the first flat plate, a plurality of protective large-diameter vents are formed in a shape larger than the diameter of the rod-shaped object,
The electronic device according to claim 1, wherein a plurality of protective small-diameter vents are formed in the second flat plate in a shape smaller than the diameter of the rod-shaped object. A plurality of air outlets on the second side wall having a shape larger than the diameter of the rod-shaped object,
The protective plate is formed in a shape larger than the diameter of the rod-shaped object, and a plurality of protective large-diameter vents are formed.
The protective plate is disposed with a predetermined inclination with respect to the second side wall in the height direction, so that the tip of the rod-shaped object comes into contact with the periphery of the protective large-diameter vent and the plurality of The electronic device according to claim 1, wherein contact with the electronic component is prevented. A plurality of air outlets on the second side wall having a shape larger than the diameter of the rod-shaped object,
The protective plate includes a first flat plate and a second flat plate bent in an L shape, and a third flat plate and a fourth flat plate bent in an L shape in the same direction continuously from the second flat plate. The first flat plate and the third flat plate are disposed orthogonal to the second side wall, and the second flat plate and the fourth flat plate are opposed in parallel to the second side wall,
A plurality of protective large-diameter vents are formed in the first flat plate and the third flat plate in a shape larger than the diameter of the rod-shaped object,
2. The electronic device according to claim 1, wherein a plurality of protective small-diameter vents are formed in the second flat plate and the fourth flat plate in a shape smaller than a diameter of the rod-shaped object. The air outlet of the second side wall is formed as an opening larger than the diameter of the rod-shaped object,
The protective plate is formed with a plurality of protective small-diameter vents in a shape smaller than the diameter of the rod-shaped object,
The electronic device according to claim 1, wherein the protection plate is arranged with a predetermined inclination with respect to the second side wall in a height direction. The air outlet of the second side wall is formed as an opening larger than the diameter of the rod-shaped object,
The protective plate is formed with a protective small-diameter vent whose one end side is smaller than the diameter of the rod-shaped object, and gradually increases in shape toward the other end side, and the other end side is the rod-shaped object. A protective large-diameter vent is formed in a shape larger than the diameter of
The protective plate is provided with the protective small-diameter vent on the lower side and the protective large-diameter vent located on the upper side with a predetermined inclination with respect to the second side wall in the height direction. The electronic device according to claim 1. A housing, a fan incorporated in the housing, and a plurality of electronic components including a heat generating electronic component housed in the housing,
When the fan is driven, a flow of cooling air from the air intake port formed on the first side wall of the housing to the air outlet port formed on the second side wall of the housing is generated inside the housing. The heat generating electronic component is cooled;
A plurality of air outlets on the second side wall are opened in a shape larger than the diameter of the rod-like object that enters the inside of the housing,
An electronic device provided with a louver around the plurality of air discharge ports to prevent the rod-like object entering from the air discharge port from engaging and moving toward the electronic component side. A housing, a fan incorporated in the housing, and a plurality of electronic components including a heat generating electronic component housed in the housing,
A plurality of electronic components including heat generating electronic components are housed inside the housing, and have a fan.
When the fan is driven, a flow of cooling air from the air intake port formed on the first side wall of the housing to the air outlet port formed on the second side wall of the housing is generated inside the housing. The heat generating electronic component is cooled;
The second side wall is formed as a convex wall surface that bulges outside the housing, a concave wall surface that is recessed inside the housing, or a wall surface on which concave and convex shapes are repeated,
An electronic apparatus in which a plurality of air discharge ports on the second side wall are formed in a shape smaller than the diameter of a rod-like object that is about to enter from the outside of the housing.   10. The electron according to claim 1, wherein the rod-shaped object is a test probe having a diameter D = 2.5 mm and a length L = 100 mm described in Japanese Industrial Standard JIS D 5020. machine.   A power conversion device comprising the electronic device according to any one of claims 1 to 10 and converting DC power into AC power.

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