Installed power conversion equipment

Abstract

To provide an installation-type power conversion device capable of cooling an electric circuit component without complicating production or increasing cost.SOLUTION: The installation-type power conversion device comprises: a housing; a power supply unit 9 disposed on the vertical center of an internal space of the housing to convert AC power into DC power and output the DC power; a partition wall 29 that separates the internal space into a first space in which the power supply unit 9 is disposed and a second space including an upper space S2 above the power supply unit 9, a lower space S1 below the power supply unit 9, and connection spaces S3 and S4; and air-cooling means for sucking external air into the first space and air-cooling the power supply unit 9 using the external air. The second space is a sealed space surrounded by the partition wall 29 and the housing. Circulation means 13 and 30 for circulating internal air are arranged in the second space.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a stationary power conversion device. [Background technology]

[0002] Conventionally, stationary power conversion devices called charging stands have been used to charge the onboard batteries of electrically powered vehicles such as electric vehicles and plug-in hybrid vehicles. The stationary power conversion device includes a housing that is installed on an installation surface and electric circuit components for power conversion housed within the housing.

[0003] Air cooling is a common method for cooling electrical circuit components housed in a housing. To achieve this, the housing is provided with an air intake port for taking in air from the outside and an exhaust port for exhausting air heated by the electrical circuit components to the outside (see, for example, Patent Document 1).

[0004] While air cooling is effective in cooling electrical circuit components, it can also introduce dust, moisture, salt, etc. into the housing, which can have a negative impact on the electrical circuit components (for example, reduced performance or reliability).

[0005] As a countermeasure, a sealing material such as silicon bond can be applied to the entire surface of the board on which the electric circuit components are mounted, thereby protecting the electric circuit components from dust, moisture, salt, etc. However, applying the above countermeasure to all boards on which electric circuit components are mounted complicates production and increases costs. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-50380 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a stationary power conversion device that can cool electrical circuit components without complicating production or increasing costs. [Means for solving the problem]

[0008] In order to solve the above problems, a stationary power conversion device according to the present invention includes: a box-shaped housing to be installed on an installation surface; a power supply unit disposed at the vertical center of the internal space of the housing, which converts AC power into DC power and outputs the DC power; An installed power conversion device comprising: a partition wall that separates the internal space into a first space in which the power supply unit is disposed and a second space that includes an upper space above the power supply unit, a lower space below the power supply unit, and a connecting space that connects the upper space and the lower space; an air-cooling unit that takes in external air into the first space and cools the power supply unit with the external air, The second space is a space surrounded by the partition wall and the housing, and a circulation means for circulating the internal air is disposed in the second space.

[0009] Among the electrical circuit components of a stationary power conversion device, the power supply unit typically generates the most heat. Therefore, in this configuration, the power supply unit is placed in a first space for air cooling, while a second space is formed separated from the first space by a partition wall, allowing electrical circuit components other than the power supply unit to be placed in the second space. A circulation means for circulating the internal air is placed in the second space, allowing the electrical circuit components to be cooled, eliminating the need to apply a sealing material such as silicone bond to the electrical circuit components.

[0010] In the installed power conversion device, The air cooling means is an intake port provided at a lower portion of the housing; a cooling fan provided below the power supply unit; an exhaust port provided in an upper portion of the housing, The cooling fan can be configured to be disposed below the power supply unit.

[0011] In the installed power conversion device, The circulation means is a duct portion provided in the connection space for communicating the upper space with the lower space; and a circulation fan that moves the air inside the lower space to the upper space.

[0012] The installed power conversion device is a plurality of charging cables provided outside the housing; a relay board on which a relay circuit for distributing the DC power to the plurality of charging cables is mounted, The relay board can be configured to be disposed in the upper space.

[0013] In the installed power conversion device, The circulation fan may be configured to be disposed at the boundary between the upper space and the connection space so that the internal air blown out directly hits the mounted components on the relay board. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a stationary power conversion device capable of cooling electrical circuit components without complicating production or increasing costs. [Brief explanation of the drawings]

[0015] [Figure 1] 1A to 1D are external views of a stationary power conversion device according to one embodiment of the present invention, where (A) is a front view, (B) is a rear view, (C) is a left side view, and (D) is a right side view. [Figure 2] 1 is a block diagram of electrical circuit components of a stationary power conversion device according to an embodiment of the present invention. [Figure 3] 1 is a perspective view of the inside of a housing of a stationary power conversion device according to an embodiment of the present invention. [Figure 4] 1 is a rear view showing the internal structure of a stationary power conversion device according to an embodiment of the present invention. [Figure 5] 1A and 1B are explanatory diagrams of the first space (air-cooled space) of an installed power conversion device according to one embodiment of the present invention, where (A) is a front view, (B) is a rear view, (C) is a left side view, and (D) is a right side view. [Figure 6] 1A and 1B are explanatory diagrams of the second space (enclosed space) of an installed power conversion device according to one embodiment of the present invention, where (A) is a front view, (B) is a rear view, (C) is a left side view, and (D) is a right side view. [Figure 7] 5A and 5B are diagrams showing the positional relationship between the circulation fan and the relay board according to one embodiment of the present invention, where FIG. 5A is a left side view and FIG. 5B is a perspective view. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a stationary power conversion device according to the present invention will be described with reference to the accompanying drawings.

[0017] 1 shows an external view of a stationary power conversion device 1 according to one embodiment of the present invention. The stationary power conversion device 1 is a charging stand for charging the onboard battery of an electrically powered vehicle such as an electric vehicle or a plug-in hybrid vehicle, and includes a box-shaped housing 2 that is placed on an installation surface, electric circuit components housed in the interior space of the housing 2, and multiple (two in this embodiment) charging cables 3 and 4.

[0018] The housing 2 includes a base 2a that is placed on an installation surface, and a front panel 2b, a rear panel 2c, a left side panel 2d, a right side panel 2e, and a ceiling panel 2f that are provided on the base 2a. A charging cable 3 is drawn out from the top of the left side panel 2d to the outside of the housing 2. A charging cable 4 is drawn out from the top of the right side panel 2e to the outside of the housing 2. The charging connectors provided at the ends of the charging cables 3 and 4 are stored in the front panel 2b.

[0019] The front panel 2b is provided with a user interface 5 that is operable by a user. The user interface 5 includes an operation unit such as operation buttons, a display unit such as a display, and a billing unit. The billing unit accepts billing for the usage fee (charging fee) of the installed power conversion device 1.

[0020] A slit-shaped air intake port 6 is provided at the bottom of the right side panel 2e for taking in outside air (hereinafter referred to as outside air) into the housing 2. A slit-shaped air exhaust port 7 is provided at the top of the rear panel 2c for exhausting the taken-in outside air. A U-shaped metal plate 8 is attached to the rear panel 2c so as to cover the air exhaust port 7, and the outside air exhausted from the air exhaust port 7 is exhausted from above and below the metal plate 8.

[0021] The internal space of the housing 2 is divided into a first space (air-cooled space) through which external air passes, and a second space (sealed space) separated from the first space. The first space is more suitable for cooling electrical circuit components than the second space. For this reason, in the installed power conversion device 1, electrical circuit components that generate a large amount of heat are arranged in the first space, and electrical circuit components that generate a small amount of heat are arranged in the second space.

[0022] 2 shows a block diagram of the electrical circuit components of the installed power conversion device 1. The installed power conversion device 1 includes input terminals T1 to T3, output terminals T4 to T7, a power supply unit section 9, an input section 10, and a relay board 11.

[0023] The input terminals T1 to T3 are connected to an external AC power supply and receive AC power from the external AC power supply. The output terminals T4 and T5 are connected to a charging cable 3, and the output terminals T6 and T7 are connected to a charging cable 4. The input terminals T1 to T3 are provided on the bottom of the housing 2, and the output terminals T4 to T7 are provided on the top of the housing 2. In FIG. 2, the input terminals T1 to T3 and the output terminals T4 to T7 are shown on the housing 2, but the input terminals T1 to T3 may be provided between the housing 2 and the input unit 10, and the output terminals T4 to T7 may be provided between the housing 2 and the relay board 11.

[0024] The power supply unit section 9 is composed of a plurality of (five in this embodiment) power supply units 9-1 to 9-5 connected in parallel. The power supply unit 9-1 is composed of electric circuit components (an AC / DC conversion circuit, a DC / DC conversion circuit, and drive circuits for driving these) housed in a rectangular metal case, and converts input AC power into DC power for output. The AC / DC conversion circuit converts the input AC power into DC power while improving the power factor of the AC power, and outputs the DC / DC conversion circuit. The DC / DC conversion circuit converts the DC power input from the AC / DC conversion circuit into desired DC power (for example, requested by the electric vehicle). The DC / DC conversion circuit is composed of, for example, a primary-side switching circuit, an isolation transformer, and a secondary-side rectifier circuit. The power supply units 9-2 to 9-5 have the same configuration as the power supply unit 9-1. The power supply units 9-1 to 9-5 are each configured to be capable of outputting a maximum of 20 [kW] of DC power, and the power supply unit section 9 is configured to be capable of outputting a maximum of 100 [kW] of DC power.

[0025] The power supply unit 9 generates the most heat among all the electric circuit components, and is therefore placed in the first space. In the power supply units 9-1 to 9-5, the boards on which the electric circuit components (AC / DC conversion circuits, DC / DC conversion circuits, and each drive circuit) are mounted are housed in metal cases with a sealing material such as silicon bond applied to the entire surface.

[0026] The input section 10 is composed of electric circuit components provided between the input terminals T1 to T3 and the power supply unit 9, and includes at least a breaker (for example, a ground fault circuit interrupter). The input section 10 generates less heat than the power supply unit 9. The input section 10 is disposed in the second space.

[0027] The relay board 11 is a circuit board on which a plurality of relays that constitute a relay circuit are mounted. The relay circuit of the relay board 11 is interposed in the power lines that connect the power supply unit 9 and the output terminals T4 to T7, and distributes the output of the power supply unit 9 to two systems of the charging cables 3 and 4. The relay board 11 generates less heat than the power supply unit 9 and more heat than the input terminal 10. The relay board 11 is disposed in the second space.

[0028] The installed power conversion device 1 includes two air-cooling fans 12 (12-1, 12-2) and one circulation fan 13. The air-cooling fans 12 are arranged in the first space, and the circulation fan 13 is arranged in the second space. The air-cooling fans 12, the air intake 6, and the air exhaust 7 correspond to the "air-cooling means" of the present invention. The circulation fan 13 circulates the air in the second space (hereinafter referred to as the internal air).

[0029] The installed power conversion device 1 also includes, as other electric circuit components, a control power supply 14, a first control board 15, a second control board 16, a third control board 17, and a personal computer 18. These electric circuit components generate little heat, and are therefore arranged in the second space.

[0030] Control power supply 14 generates a DC control voltage and supplies the generated control voltage to first control board 15, second control board 16, third control board 17, and personal computer 18. In Fig. 2, the control voltage is supplied directly from control power supply 14 to first control board 15, second control board 16, third control board 17, and personal computer 18, but the control voltage may also be supplied from control power supply 14 to second control board 16, third control board 17, and personal computer 18 via first control board 15, for example.

[0031] First control board 15 is a circuit board on which a main control circuit is mounted. The main control circuit controls the allocation of power supply units 9-1 to 9-5. Specifically, the main control circuit outputs to second control board 16 a first control signal related to control of drive / stop of power supply units 9-1 to 9-5 and a second control signal related to on / off control of the relays of relay board 11, in accordance with a command value (e.g., a charging current command value) requested by the electric vehicle and the usage status of charging cables 3 and 4. The main control circuit also controls the drive of cooling fan 12.

[0032] Second control board 16 is a circuit board on which an output control circuit is mounted. The output control circuit controls the drive / stop of power supply units 9-1 to 9-5 based on a first control signal, and controls the on / off of the relay of relay board 11 based on a second control signal. For example, the output control circuit controls the relay of relay board 11 so that the output of power supply unit section 9 is distributed only to charging cable 3, and drives at least one of power supply units 9-1 to 9-5, and performs charging current control for the power supply unit that is currently being driven so that the current value of the charging current output from charging cable 3 matches a target value (charging current command value). The output control circuit also controls the drive of circulation fan 13.

[0033] A UI control circuit is mounted on the third control board 17. The UI control circuit controls the user interface 5 and communicates with the electric vehicle (for example, CAN communication with the electric vehicle via the charging cables 3 and 4).

[0034] The personal computer 18 is composed of a storage unit, a calculation unit, a communication unit (input / output unit), and a control unit that controls these. The personal computer 18 communicates with the user interface 5 and stores a log of the operating status of the user interface 5 (for example, a log of operations in the operation unit, a log of charges in the charging unit).

[0035] 3, the housing 2 includes a frame 19 provided on the base 2a. The frame 19 includes a rectangular lower frame 20 provided on the upper surface of the base 2a, four support columns 21 to 24 erected at the four corners of the lower frame 20, and a rectangular upper frame 25 provided at the upper ends of the support columns 21 to 24. A front panel 2b is attached to the support columns 21 and 22 side, a rear panel 2c is attached to the support columns 23 and 24 side, a left side panel 2d is attached to the support columns 21 and 23 side, a right side panel 2e is attached to the support columns 22 and 24 side, and a ceiling panel 2f is attached to the upper surface of the upper frame 25.

[0036] The housing 2 includes a first duct section 26 and a second duct section 27. The first duct section 26 is provided in the lower right portion of the frame 19, and serves as a flow path for external air taken in through the air intake 6. The second duct section 27 communicates with the first duct section 26 at the upper portion of the left side surface of the first duct section 26. The left side surface of the second duct section 27 is fixed to the supports 21 and 23, and serves as a flow path for external air like the first duct section 26. Two air-cooling fans 12 are provided on the upper surface of the second duct section 27. The external air taken in through the air intake 6 is sucked into the air-cooling fans 12 via the first duct section 26 and the second duct section 27.

[0037] The housing 2 is provided with a first support member 28a and a second support member 28b between the support posts 23, 24 above the cooling fan 12. The first support member 28a supports the rear end of the lower surfaces of the power supply units 9-1 to 9-5, and the second support member 28b supports the rear end of the upper surface of the power supply units 9-1 to 9-5. An exhaust port 7 of the rear panel 2c is provided above the second support member 28b.

[0038] A partition wall portion 29 is provided above the first duct portion 26 and the second duct portion 27 to separate the internal space of the housing 2 into a first space through which external air passes and a second space through which external air does not pass. The partition wall portion 29 is made up of a plurality of partition walls 29a to 29g. The plurality of partition walls 29a to 29g may be formed by bending a single metal plate or by joining a plurality of metal plates together.

[0039] Partition wall 29a is located above exhaust port 7 and defines the upper end of the first space. The rear end face of partition wall 29a is in contact with rear panel 2c via a seal member to prevent air from passing through. Partition walls 29b and 29c are located above second support member 28b and ensure space on the front side for arranging circulation fan 13 and relay board 11, and ensure space on the rear side for arranging power lines connecting power supply units 9-1 to 9-5 and relay board 11. The power lines pass through partition wall 29c, and a seal member is provided at the penetration portion to prevent air from passing through.

[0040] The partition wall 29d is located on the front side of the power supply units 9-1 to 9-5. A circulation duct section 30 (corresponding to the "duct section" of the present invention) is provided on the right end of the front side of the partition wall 29d. The circulation duct section 30 extends from the upper end of the circulation fan 13 to near the lower end of the partition wall 29d. The circulation duct section 30 and the portion of the partition wall 29d where the circulation duct section 30 is provided (hereinafter referred to as the partition wall 29d') form a flow path for the internal air of the second space. The space between the partition wall 29d and the front panel 2b also forms a flow path for the internal air. The circulation duct section 30 and the circulation fan 13 correspond to the "circulation means" of the present invention.

[0041] Partition walls 29e to 29g are located on the front side of air-cooling fan 12, between the lower end of partition wall 29d and the upper surfaces of first duct portion 26 and second duct portion 27. The lower end of partition wall 29g is in contact with the upper surfaces of first duct portion 26 and second duct portion 27 to prevent air from passing through. The left side of partition wall portion 29 is in contact with left side panel 2d via a seal member to prevent air from passing through, and the right side of partition wall portion 29 is in contact with right side panel 2e via a seal member as well.

[0042] In this way, the internal space of the housing 2 is divided into a first space and a second space by the partition wall 29. The second space is an airtight space surrounded by the partition wall 29 and the housing 2, but it does not have to be a completely airtight space. For example, gaps may occur at the boundaries between the partition walls 29a to 29g and at the corners of the first duct portion 26 and the second duct portion 27 due to errors in design dimensions or errors during assembly.

[0043] 4 shows a rear view of the internal structure of the installed power conversion device 1. As shown in the figure, the power supply units 9-1 to 9-5, which generate the greatest amount of heat among the electric circuit components, are arranged in the vertical center of the internal space of the housing 2. More specifically, the power supply units 9-1 to 9-5 are arranged in the first space between the first support member 28a and the second support member 28b.

[0044] In the second space (corresponding to the "lower space" of the present invention) below the power supply units 9-1 to 9-5, electric circuit components including the input unit 10, the control power supply 14, the first control board 15, the third control board 17, and the personal computer 18 are arranged. These electric circuit components are attached to the outer peripheral surface of the first duct portion 26 or the outer peripheral surface of the second duct portion 27, or are attached to a holding member 31 provided below the second duct portion 27.

[0045] Electric circuit components including a relay board 11 and a second control board 16 are disposed in a second space (corresponding to the "upper space" of the present invention) above the power supply units 9-1 to 9-5. These electric circuit components are attached to the partition wall 29 or the frame 19. Furthermore, the charging cables 3 and 4 are drawn out to the outside of the housing 2 from the second space above the power supply units 9-1 to 9-5.

[0046] Next, cooling of the first space, which is an air-cooled space, will be described with reference to Fig. 5. In Fig. 5, the hatched portion indicates the first space.

[0047] In the first space, when the air-cooling fan 12 is driven, external air taken in from the lower right side surface (air intake port 6) is sucked into the air-cooling fan 12 via the first duct portion 26 and the second duct portion 27. Because the air-cooling fan 12 is located below the power supply unit portion 9, the external air sent out from the air-cooling fan 12 hits the power supply unit portion 9 directly, enhancing the cooling effect of the power supply unit portion 9. The external air that passes through the power supply unit portion 9 (including the gaps between the power supply units 9-1 to 9-5) is exhausted from the upper back surface (exhaust port 7).

[0048] Next, cooling of the second space, which is an enclosed space, will be described with reference to Fig. 6. In Fig. 6, the hatched portion indicates the second space. Note that the circulation duct portion 30 is not hatched because hatching would make it difficult to see.

[0049] The second space is made up of a space S1 below the power supply unit 9, a space S2 above the power supply unit 9, a first connection space S3 located in front of the power supply unit 9 and inside the circulation duct 30, and a second connection space S4 located in front of the power supply unit 9 and outside the circulation duct 30. The first connection space S3 and the second connection space S4 correspond to the "connection spaces" of the present invention, and are spaces that connect (communicate) the lower space S1 and the upper space S2.

[0050] The upper space S2 is susceptible to the heat generated by the power supply unit 9, and furthermore, the relay board 11, which generates the second largest amount of heat after the power supply unit 9, is located therein. For this reason, the upper space S2 becomes hotter than the lower space S1. In other words, the air inside the lower space S1 becomes colder than the air inside the upper space S2. Furthermore, because the lower space S1 has a larger volume than the upper space S2, circulating the cooled air inside the lower space S1 makes it possible to cool the electrical circuit components (especially the relay board 11).

[0051] In the second space, the circulation fan 13 is driven, and the cooled internal air in the lower space S1 passes through the first connection space S3 in the circulation duct 30 and is drawn into the circulation fan 13 provided at the upper end of the circulation duct 30. The internal air sent from the circulation fan 13 to the upper space S2 cools the electrical circuit components (relay board 11 and second control board 16) arranged in the upper space S2. The internal air in the upper space S2 moves to the lower space S1 via the second connection space S4. In this way, the internal air in the second space circulates from the lower space S1 to the first connection space S3, the upper space S2, the second connection space S4, and then back to the lower space S1.

[0052] 7 shows the positional relationship between the relay board 11 arranged in the upper space S2 and the circulation fan 13. (A) of Fig. 7 is a left side view, and (B) is a perspective view.

[0053] The relay board 11 is disposed parallel to the partition wall 29b near the rotation axis of the blades of the circulation fan 13. The relay board 11 is attached to the ends of multiple first shaft members 32 that are provided on the partition wall 29b. Multiple relays RL that constitute a relay circuit are mounted on the front side of the relay board 11, and second shaft members 33 are attached to the four corners. A board 34 that is larger than the relay board 11 is attached to the end of the second shaft member 33 in parallel to the relay board 11. This positional relationship between the relay board 11 and the circulation fan 13 allows the internal air sent out from the circulation fan 13 to directly hit the components mounted on the relay board 11 (particularly the relays RL), thereby improving the cooling effect of the relay circuit.

[0054] As described above, in the installed power conversion device 1, the power supply unit 9 is disposed in the first space and air-cooled, while a second space is formed separated from the first space by the partition wall 29, and electrical circuit components other than the power supply unit 9 are disposed in the second space. In the second space, the circulation fan 13 circulates the cooled internal air from the lower space S1 to the upper space S2, thereby cooling the electrical circuit components, including the relay board 11, disposed in the upper space S2. Furthermore, there is no need to apply a sealing material such as silicone bond to the electrical circuit components disposed in the second space. Therefore, the installed power conversion device 1 allows electrical circuit components to be cooled without complicating production or increasing costs.

[0055] Among the electrical circuit components of the installed power conversion device 1, the power supply unit 9 not only generates the most heat but is also the heaviest. For this reason, if the power supply unit 9 is located at the top of the housing 2, the earthquake resistance of the installed power conversion device 1 will be reduced. On the other hand, if the power supply unit 9 is located at the bottom of the housing 2, all electrical circuit components above the power supply unit 9 will be affected by the heat from the power supply unit 9, reducing the cooling effect. In this regard, in the installed power conversion device 1, the power supply unit 9 is located at the center of the housing 2, so that the cooled internal air in the lower space S1 can cool the electrical circuit components, including the relay board 11, located in the upper space S2, without reducing earthquake resistance.

[0056] Although the embodiments of the stationary power conversion device according to the present invention have been described above, the present invention is not limited to the above-described embodiments.

[0057] The installed power conversion device of the present invention is an installed power conversion device comprising a box-shaped housing to be installed on an installation surface, and a power supply unit section that is arranged in the vertical center of the internal space of the housing and converts AC power into DC power and outputs it, and is provided with a partition section that separates the internal space into a first space in which the power supply unit section is arranged, and a second space consisting of an upper space above the power supply unit section, a lower space below the power supply unit section, and a connection space that connects the upper space and the lower space, and air-cooling means that takes in external air into the first space and cools the power supply unit section with the external air, and the second space is a space surrounded by the partition section and the housing, and the configuration can be changed as appropriate as long as circulation means for circulating internal air is arranged in the second space.

[0058] For example, in the above embodiment, the position and number of circulation fans 13 can be changed. For example, multiple circulation fans 13 may be placed at the boundary between the second connection space S4 and the upper space S2, and cooled internal air from the lower space S1 may be moved to the upper space S2 via the second connection space S4. In this case, it is preferable to place the multiple circulation fans 13 so that the rotation axes of the fan blades are oriented vertically, similar to the air-cooling fan 12. Furthermore, the size of the circulation duct portion 30 can be appropriately changed in accordance with the change in the position of the circulation fans 13.

[0059] The stationary power conversion device according to the present invention may include a single charging cable, or may include three or more charging cables. When a single charging cable is included, a relay board on which a relay circuit for distributing the output of the power supply unit is mounted is not required.

[0060] The arrangement of the electric circuit components in the second space may be changed as appropriate, but if the electric circuit components include a relay board, it is preferable to arrange the relay board in the space above the second space. Also, other electric circuit components may be arranged in the first space together with the power supply unit. [Explanation of symbols]

[0061] 1. Installed power conversion equipment 2. Case 2a Base 2b Front Panel 2c Rear Panel 2d Left side panel 2e Right side panel 2nd floor ceiling panel 3, 4 Charging cable 5 User Interface 6 Air intake 7. Exhaust port 8 metal plate 9 Power supply unit 9-1~9-5 Power supply unit 10 Input section 11 Relay board 12 Cooling fan 13 Circulation fan 14 Control power supply 15 First control board 16 Second control board 17 Third control board 18. Computer 19 frames 20 Bottom frame 21~24 posts 25 Upper frame 26 First duct section 27 Second duct section 28a first support member 28b Second support member 29 Bulkhead 29a~29g Bulkhead 30 Circulation duct section 31 Retaining member 32 First shaft member 33 Second shaft member 34 PCB

Claims

1. a box-shaped housing to be installed on an installation surface; a power supply unit disposed at the vertical center of the internal space of the housing, which converts AC power into DC power and outputs the DC power; An installed power conversion device comprising: a partition wall provided in the internal space and separating the internal space into a first space in which the power supply unit is disposed and a second space including an upper space above the power supply unit, a lower space below the power supply unit, and a connecting space connecting the upper space and the lower space; an air-cooling unit that takes in external air into the first space and cools the power supply unit with the external air; a first electric circuit component disposed in the upper space and generating less heat than the power supply unit; a second electric circuit component that is disposed in the lower space and generates less heat than the first electric circuit component, the second space is a space surrounded by the partition wall and the housing, and a circulation means for circulating internal air is disposed in the second space; The lower space has an internal air temperature lower than that of the upper space and has a larger volume than that of the upper space.

1. A stationary power conversion device comprising:

2. The air cooling means is an intake port provided at a lower portion of the housing; a cooling fan provided below the power supply unit; an exhaust port provided in an upper portion of the housing, the housing includes an air-cooling duct portion as a flow path for sending the outside air taken in through the air intake port to the air-cooling fan, the first space includes a first upper space in which the power supply unit is disposed above the air-cooling duct, and a first lower space inside the air-cooling duct, The partition wall is provided above the air-cooling duct, extends in the up-down direction to separate the first upper space from the connection space, and defines an upper end of the first upper space.

2. The stationary power conversion device according to claim 1.

3. The circulation means is a duct portion provided in the connection space for communicating the upper space with the lower space; a circulation fan that moves the air inside the lower space to the upper space.

2. The stationary power conversion device according to claim 1.

4. a plurality of charging cables provided outside the housing; a relay board on which a relay circuit for distributing the DC power to the plurality of charging cables is mounted, The relay board is disposed in the upper space.

4. The stationary power conversion device according to claim 3.

5. The circulation fan is disposed at the boundary between the upper space and the connection space so that the blown internal air directly hits the mounted components of the relay board.

5. The stationary power conversion device according to claim 4.

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