Power conversion device

Abstract

To provide a power conversion device capable of suppressing a noise leakage.SOLUTION: A power conversion device 100 comprises: a control device 10 including a noise source; and a housing 50 having a housing space for housing the control device 10, and provided with a connector opening part 56 communicating with the housing space and an external space. Further, the power conversion device comprises a wire 40 conducted with a ground, and forming a surrounding part 44. In the wire 40, the surrounding part 44 is arranged between a part of the connector opening part 56 and the noise source.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] An example of a power conversion device is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-70682 Summary of the Invention [Problem to be solved by the invention]

[0004] In a power conversion device, a circuit device including a noise source is housed in a housing, and in this power conversion device, there is a risk that noise emitted from the noise source may leak outside the housing.

[0005] One disclosed object is to provide a power conversion device that can suppress noise leakage. [Means for solving the problem]

[0006] The power conversion device disclosed herein comprises: a circuit device (10, 20) including a noise source; a housing (50) having an accommodation space for accommodating a circuit device and having a through hole for communicating the accommodation space with an external space; a conductive member (40, 40a) that is electrically connected to the ground and forms an enclosure (44, 441, 442, 443); The conductive member has an enclosure disposed between a part of the through hole and the noise source.

[0007] In this way, in the power conversion device, the surrounding portion of the conductive member is disposed between a part of the through hole and the noise source, and therefore, in the power conversion device, the surrounding portion acts as an antenna, and it is possible to prevent noise emitted from the noise source from leaking into the external space through the through hole.

[0008] The various aspects disclosed in this specification employ different technical means to achieve their respective objectives. The reference numerals in parentheses in the claims and in this section are intended to exemplify correspondences with the following embodiments and are not intended to limit the technical scope. The objectives, features, and advantages disclosed in this specification will become more apparent by reference to the following detailed description and the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view showing a schematic configuration of a power conversion device according to an embodiment. [Figure 2] FIG. 2 is a plan view seen from the direction of arrow II in FIG. [Figure 3] FIG. 3 is a plan view seen from the direction of arrow III in FIG. 2. [Figure 4] FIG. 4 is an enlarged view of a surrounding portion in the embodiment. [Figure 5] FIG. 10 is an enlarged view of a surrounding portion in the first modified example. [Figure 6] FIG. 10 is an enlarged view of a surrounding portion in Modification 2. [Figure 7] FIG. 11 is an enlarged view of a surrounding portion in Modification 3. [Figure 8] FIG. 10 is a plan view showing a schematic configuration of a power conversion device according to a fourth modification. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, several embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to matters described in the preceding embodiment may be assigned the same reference numerals, and duplicated explanations may be omitted. In each embodiment, when only a part of the configuration is described, other parts of the configuration can be applied by referring to the other embodiment described earlier. In the following, three mutually orthogonal directions are referred to as the X direction, the Y direction, and the Z direction.

[0011] (Embodiment) As shown in Figures 1 and 2, the power conversion device 100 includes a control device 10, a power module 20, a housing 50, a cover member 60, a PN connector 80, and the like. The power conversion device 100 is configured to be mountable on a vehicle. The vehicle may be an electric vehicle, a hybrid vehicle, a fuel cell vehicle, or the like. Note that Figure 2 shows a state in which the cover member 60 has been removed.

[0012] In this embodiment, as an example, a rotating mechanism such as a gear and a motor is housed in a housing 50 together with the control device 10 and the power module 20. The power conversion device 100 controls the drive of the motor to rotate the wheels via the gear and the drive shaft S1. Therefore, the power conversion device 100 can also be called a rotating body device.

[0013] However, the present disclosure is not limited to the above. The gears and motors do not have to be housed in the housing 50. Furthermore, the power conversion device 100 may be mounted on a moving body other than a vehicle. The moving body may be an air vehicle such as an electric vertical take-off and landing aircraft or a drone, a ship, construction machinery, agricultural machinery, etc. Furthermore, the power conversion device 100 may be mounted on a body other than a moving body.

[0014] <Control device> 1 and 2, the control device 10 is a device that controls the power module 20, which will be described later. More specifically, the control device 10 controls the semiconductor switching elements of the power module 20. The control device 10 controls the drive of the motor by controlling the semiconductor switching elements.

[0015] The control device 10 includes a wiring board 11 and circuit elements 12 to 14 mounted on the wiring board 11. The control device 10 also includes a board connector 15 to which a wire 40, which will be described later, is connected.

[0016] The wiring board 11 has conductive wiring formed on an electrically insulating base material. The wiring is formed on the surface or inside of the base material. The wiring is a wiring pattern formed by patterning metal foil, or a land or pad on which a circuit element is mounted. The wiring pattern is a signal pattern, a power supply pattern, a ground pattern, etc. The ground pattern corresponds to the ground.

[0017] Incidentally, through holes or the like may be provided in the wiring board 11. In this case, the control device 10 is electrically connected to the semiconductor switching elements of the power module 20 via the through holes.

[0018] The circuit elements 12 to 14 are electrically connected to the wiring. The circuit elements 12 to 14 are microcomputers, semiconductor switching elements, capacitor elements, resistor elements, coils, etc. The circuit element 12 is a noise source that generates noise when it operates. It can be said that the control device 10 includes a noise source. It can also be said that the control device 10 itself is a noise source.

[0019] The reference numeral 12a denotes the rear end of the circuit element 12. The rear end 12a is the portion of the circuit element 12 that is farthest from the connector opening 56. The connector opening 56 will be described later.

[0020] The circuit element 13 has an interlock function. The interlock function is, for example, a function for switching between permission and prohibition of control of the power module 20. The circuit element 13 is electrically connected to the wire 40 via the board connector 25. The circuit element 13 is configured to be able to receive an electrical signal from the wire 40. The circuit element 13 determines whether or not the PN connector 80 is attached to the housing 50 based on the electrical signal.

[0021] The circuit element 13 determines that the PN connector 80 is attached when an electrical signal is input, and determines that the PN connector 80 is not attached when an electrical signal is not input. Then, the circuit element 13 allows execution when it determines that the PN connector 80 is attached, and prohibits execution when it determines that the PN connector 80 is not attached. In other words, the circuit element 13 allows execution when an electrical signal is input, and prohibits execution when an electrical signal is not input.

[0022] The board connector 25 has a plurality of terminals. The plurality of terminals includes a ground terminal connected to the ground pattern. The plurality of terminals also includes a signal terminal connected to the circuit element 13 via the signal pattern. The circuit element 13 and the board connector 25 can be said to be part of an interlock mechanism. The interlock function may also be provided by the circuit element 14.

[0023] <Power module> As shown in FIG. 2 , the power module 20 is stacked on the control device 10 in the Z direction. The power module 20 includes a plurality of semiconductor switching elements. The power module 20 has the semiconductor switching elements connected in series between high-potential wiring and low-potential wiring. The power module 20 constitutes a three-phase inverter including a plurality of semiconductor switching elements. The semiconductor switching elements may be MOSFETs, IGBTs, or the like. Gate terminals of the semiconductor switching elements are electrically connected to the control device 10.

[0024] In the power module 20, the semiconductor switching elements are controlled to be turned on and off by control signals from the control device 10. The semiconductor switching elements are noise sources that generate noise when they operate. Therefore, the power module 20 includes a noise source. In addition, the power module 20 itself can also be considered a noise source.

[0025] As shown in Figures 1, 2 and 3, the power module 20 is connected to a power supply bus bar 30. The power supply bus bar 30 includes a P bus bar 31 and an N bus bar 32. The P bus bar 31 is part of the high-potential wiring. The N bus bar 32 is part of the low-potential wiring.

[0026] 3, the P bus bar 31 and the N bus bar 32 are arranged opposite a connector opening 56, which will be described later. Therefore, it can be said that the P bus bar 31 and the N bus bar 32 are exposed to the outside of the housing 50 from the connector opening 56. More specifically, when the PN connector 80 is not attached to the housing 50, the P bus bar 31 and the N bus bar 32 are exposed to the external space from the connector opening 56.

[0027] Furthermore, the connector opening 56 is closed by the attachment of the PN connector 80. Therefore, the P bus bar 31 and the N bus bar 32 are covered by the PN connector 80 when the PN connector 80 is attached to the housing 50. In other words, the P bus bar 31 and the N bus bar 32 are not exposed to the external space. The P bus bar 31 and the N bus bar 32 are electrically connected to the power supply wire 82 when the PN connector 80 is attached to the housing 50. The PN connector 80 and the power supply wire 82 will be explained later.

[0028] In this embodiment, the control device 10 and the power module 20 are used as an example of a circuit device. However, the circuit device may include a smoothing capacitor or the like in addition to the control device 10 and the power module 20. The circuit device may also be referred to as a drive circuit or a drive device.

[0029] In this embodiment, a power conversion device 100 including a control device 10 and a power module 20 is used as a noise source. However, the present disclosure is not limited to this.

[0030] <Housing, cover, PN connector> As shown in Figures 1, 2, 3, etc., the housing 50 has side walls 51 to 54. The side walls 51 to 54 are arranged in an annular shape. The side wall 51 is arranged opposite the side wall 52. The side wall 53 is arranged opposite the side wall 54. The housing 50 has an opening surrounded by the side walls 51 to 54. Reference numeral 55 denotes an opening end formed at the tip of each of the side walls 51 to 54. Therefore, the opening end 55 is arranged in an annular shape. The housing 50 is mainly made of a metal such as aluminum or copper. Note that Figure 3 shows a state in which the PN connector 80 is removed.

[0031] It can be said that the housing 50 has an accommodation space surrounded by the side walls 51 to 54. The housing 50 accommodates the control device 10 and the power module 20 in the accommodation space. Furthermore, the housing 50 also has a space for accommodating rotation mechanisms such as gears and motors.

[0032] 3, the side wall 51 is provided with a connector opening 56 that connects the accommodation space with the external space. The connector opening 56 is a through-hole that penetrates the side wall 51 in the Y direction. In the power conversion device 100, the P bus bar 31, the N bus bar 32, and a portion of the wires 40 are exposed to the external space from the connector opening 56. More specifically, in the power conversion device 100, the P bus bar 31 and the like are exposed from the connector opening 56 when the PN connector 80 is not attached.

[0033] The external space is the space in which the power conversion device 100 is placed. The external space can also be said to be the space surrounding the power conversion device 100.

[0034] As shown in Fig. 1, casing 50 has a lid member 60 attached to open end 55. Casing 50 is configured such that the opening surrounded by sidewall portions 51 to 54 is closed by lid member 60. Like casing 50, lid member 60 is primarily made of a metal such as aluminum or copper. Casing 50 and lid member 60 may be made of the same material or different materials.

[0035] As shown in Figures 1 and 2, a seal member 71 is provided at the opening edge 55. The seal member 71 is provided around the entire periphery of the opening edge 55. The seal member 71 is provided to prevent liquid from entering the storage space. The seal member 71 is made primarily of resin.

[0036] The cover member 60 is attached to the open end 55 via a seal member 71. The cover member 60 and the open end 55 are fixed together with bolts or the like.

[0037] As shown in Figures 1 and 2, a PN connector 80 is attached to the housing 50. The housing 50 is configured so that the connector opening 56 is closed by the PN connector 80. The PN connector 80 includes a connector housing 81, a power supply wire 82 held in the connector housing 81, and the like. The PN connector 80 corresponds to a cover member.

[0038] The PN connector 80 includes a switch unit for realizing an interlock function. The switch unit electrically connects the electric wires 41 and 42, which will be described later, when the PN connector 80 is attached to the housing 50. The switch unit can also be considered part of the interlock mechanism. Therefore, the PN connector 80 is electrically connected to the wire 40 when attached to the housing 50 and the connector opening 56 is closed.

[0039] Like the housing 50, the connector housing 81 is mainly made of a metal such as aluminum or copper. The connector housing 81 may be made of the same material as the housing 50 and the cover member 60, or may be made of a different material.

[0040] The power supply wires 82 include a P wire and an N wire. The power supply wires 82 are electrically connected to the power supply bus bar 30 when the PN connector 80 is attached to the housing 50. That is, the P wire is electrically connected to the P bus bar 31. On the other hand, the N wire is electrically connected to the N bus bar 32.

[0041] 3, the housing 50 is provided with a seal member 72 at a position surrounding the connector opening 56. The seal member 72 is provided around the entire periphery of the connector opening 56. The seal member 72 is provided to prevent liquid from entering the storage space. Like the seal member 71, the seal member 72 is made primarily of resin.

[0042] The PN connector 80 is attached to the housing 50 via a seal member 72. The PN connector 80 and the connector opening 56 are fixed together with bolts or the like.

[0043] The housing 50 disclosed herein is merely an example. The present disclosure can also be applied to a housing 50 having, for example, four or more side walls. The housing 50 may also be provided with a refrigerant flow path for cooling the control device 10, the power module 20, etc.

[0044] <Wire> Here, the wire 40 will be described with reference to Figs. 1 to 4. The wire 40 is provided to realize an interlock function. Therefore, the wire 40 can also be called an interlock wire. The wire 40 can also be called a part of the interlock mechanism. The wire 40 is housed in a housing 50. Fig. 4 is an enlarged view of the enclosure 44. In Fig. 4, the connector opening 56 is shown by a dashed line to show the positional relationship between the enclosure 44 and the connector opening 56.

[0045] The wire 40 includes electric wires 41 and 42, an insulating member 43 that covers the electric wires 41 and 42, and a wire connector 45 that is provided on one end side of the electric wires 41 and 42. The wire 40 corresponds to a conductive member.

[0046] One end of the electric wires 41 and 42 is held by the wire connector 45. The other end of the electric wires 41 and 42 is connected to a terminal of the board connector 25. For example, the electric wire 41 is connected to a ground terminal of the board connector 25. On the other hand, the electric wire 42 is connected to a signal terminal of the board connector 25.

[0047] Wire connector 45 has a plurality of terminals. The plurality of terminals includes a ground terminal connected to electric wire 41. The plurality of terminals also includes a signal terminal connected to electric wire 42. As shown in Fig. 3, wire connector 45 is exposed to the external space through connector opening 56.

[0048] Wire connector 45 is connected to the switch unit when PN connector 80 is attached to housing 50. When wire connector 45 is connected to the switch unit, wire 40 electrically connects electric wire 41 and electric wire 42. In other words, electric wire 41 and electric wire 42 form a current path between circuit element 13 and the ground pattern. It can also be said that wire 40 forms a current path only when PN connector 80 is attached to housing 50. In this way, wire 40 is electrically connected to the ground pattern of control device 10.

[0049] When the PN connector 80 is not attached to the housing 50, the wire connector 45 is not connected to the switch unit. Therefore, the wire 40 is not electrically connected to the electric wire 41 and the electric wire 42. In other words, the current path between the circuit element 13 and the ground pattern is cut off.

[0050] Furthermore, the wire 40 has an enclosure 44. The enclosure 44 includes at least electric wires 42, 42. The enclosure 44 is formed between one end and the other end of the wire 40. The wire 40 is electrically connected to the ground pattern to form the enclosure 44.

[0051] The surrounding portion 44 is a part of the wire 40, and is a portion where parts of the wire 40 are bent so that they face each other. It can also be said that the wire 40 forms a surface surrounded by the surrounding portion 44. The surface can also be said to be an surrounding surface. The surrounding surface is indicated by the hatched portion in FIG. 4. In this embodiment, as an example, a circular surrounding portion 44 is used.

[0052] The enclosure 44 is a portion for suppressing noise from radiating from a noise source to the external space. The enclosure 44 also functions as an antenna to suppress noise from leaking into the external space. Therefore, the enclosure 44 can also be said to be a noise suppression portion or an antenna portion. The enclosure 44 can also be said to have the function of suppressing noise leakage.

[0053] In this embodiment, the wire 40, which is an interlock wire, is used as an example of a conductive member. Therefore, when the PN connector 80 is attached to the housing 50, the enclosure 44 has the function of suppressing noise leakage.

[0054] Incidentally, the housing 50, the cover member 60, and the connector housing 81 are primarily made of metal. Therefore, noise emitted from a noise source is unlikely to be radiated into the external space from the housing 50, the cover member 60, and the connector housing 81. In other words, noise is unlikely to leak into the external space from the housing 50, the cover member 60, and the connector housing 81.

[0055] However, a seal member 72 made mainly of resin is provided between the casing 50 and the connector housing 81. Therefore, there is a risk that noise emitted from the noise source will leak from the seal member 72 into the external space.

[0056] Therefore, the power conversion device 100 has an enclosure 44 for the wire 40 to suppress noise leakage from the seal member 72 to the external space. As shown in FIGS. 3 and 4, the enclosure 44 is disposed between a part of the connector opening 56 and the noise source. In other words, the area surrounded by the enclosure 44 is disposed between the part of the connector opening 56 and the noise source. Here, as an example, the circuit element 12 is taken as the noise source.

[0057] The surrounding portion 44 is disposed opposite a portion of the connector opening 56 in the penetration direction of the connector opening 56. It can also be said that the surrounding portion 44 overlaps with the projection surface of the connector opening 56 in the Y direction. The surrounding portion 44 is disposed between the rear end portion 12a of the circuit element 12 and the connector opening 56 in the Y direction. The penetration direction coincides with the Y direction. Note that a portion of the surrounding portion 44 may be disposed between a portion of the connector opening 56 and the noise source, and the other portion may be disposed in a position away from between the portion of the connector opening 56 and the noise source.

[0058] Moreover, the enclosure 44 is disposed on a straight line between a part of the connector opening 56 and the circuit element 12. In other words, the enclosure 44 is disposed so that a part of the imaginary line connecting the connector opening 56 and the circuit element 12 passes through the area enclosed by the enclosure 44.

[0059] Furthermore, the area of ​​the enclosure 44 is set according to the frequency of the noise emitted from the noise source. It can also be said that the diameter of the enclosure 44 is set according to the frequency of the noise. The area here refers to the area of ​​the enclosure surface. The enclosure 44 is set so that its area is smaller when the noise frequency is high than when it is low. Therefore, the power conversion device 100 can appropriately suppress noise leakage according to the noise frequency. The noise frequency can be determined in advance through simulations, experiments, etc.

[0060] <Effects> As described above, in the power conversion device 100, the enclosure 44 is disposed between a part of the connector opening 56 and the noise source. Therefore, in the power conversion device 100, the enclosure 44 functions as an antenna, and can prevent noise emitted from the noise source from leaking into the external space through the connector opening 56. In other words, the power conversion device 100 can prevent noise emitted from the noise source from leaking into the external space through the seal member 72.

[0061] The enclosure 44 may be disposed between a part of the opening surrounded by the open end 55 and the noise source. This allows the power conversion device 100 to suppress noise leakage from the seal member 71 to the external space. In this case, the lid member 60 corresponds to a cover member. The opening surrounded by the open end 55 corresponds to a through-hole.

[0062] The preferred embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the above embodiments, and various modifications are possible within the scope of the present disclosure. Modifications 1 to 4 will be described below as other aspects of the present disclosure. The above embodiments and modifications 1 to 4 can be implemented independently, or can be implemented in appropriate combinations. The present disclosure is not limited to the combinations shown in the embodiments, and can be implemented in various combinations.

[0063] (Variation 1) 5, the surrounding portion 44 does not have to be disposed opposite the connector opening 56 in the penetration direction of the connector opening 56. FIG. 5 is a view corresponding to FIG.

[0064] The enclosure 44 only needs to be arranged so that at least a portion of the imaginary line connecting the connector opening 56 and the circuit element 12 passes through the area enclosed by the enclosure 44. Even if the enclosure 44 is arranged in this manner, the power conversion device 100 can achieve the same effects as the above embodiment.

[0065] (Variation 2) 6, the surrounding portion 441 may be triangular in shape. The position where the surrounding portion 441 is disposed is the same as that of the surrounding portion 44. FIG. 6 is a view corresponding to FIG.

[0066] The enclosure 441 includes a first side 441a and a second side 441b. The first side 441a and the second side 441b have a linear shape. The first side 441a and the second side 441b are provided in a continuous manner. Furthermore, the first side 441a and the second side 441b are connected to each other at an acute angle, for example. Even if the enclosure 441 is configured in this manner, the power conversion device 100 can achieve the same effects as the above embodiment. Note that the sides 441a, 441b may be connected in a curved manner.

[0067] (Variation 3) 7, the surrounding portion 442 may be rectangular. The surrounding portion 442 is disposed in the same position as the surrounding portion 44. FIG. 7 is a view corresponding to FIG.

[0068] The enclosure 442 includes a first side 442a, a second side 442b, and a third side 442c. Each of the sides 442a to 442c has a linear shape. The first side 442a and the second side 442b are connected at a right angle. The second side 442b and the third side 442c are connected at a right angle. Even if the enclosure 442 is configured in this manner, the power conversion device 100 can achieve the same effects as the above embodiment. Note that the first side 442a and the second side 442b may be connected in a curved line. Similarly, the second side 442b and the third side 442c may be connected in a curved line.

[0069] (Variation 4) 8, the power converter 100 may include a fixing member 90. FIG. 8 is a view corresponding to FIG.

[0070] The fixing member 90 is a plate-shaped member. The fixing member 90 is mainly composed of a metal such as aluminum or copper. The fixing member 90 is disposed in the housing space. The fixing member 90 is fixed to the housing 50 with bolts or the like. The fixing member 90 corresponds to a metal plate.

[0071] The control device 10 is fixed to a fixing member 90. Therefore, the control device 10 is fixed to the housing 50 via the fixing member 90.

[0072] Furthermore, the power conversion device 100 includes a bus bar 40a. The bus bar 40a is made of a conductive member. The bus bar 40a includes an enclosure 443 and a connection portion 45a. The connection portion 45a is connected to a fixing member 90 that serves as a ground. In other words, the bus bar 40a is electrically connected to the ground. The bus bar 40a corresponds to a conductive member.

[0073] The enclosure 443 is configured in the same manner as the enclosure 44. The position where the enclosure 443 is disposed is the same as the enclosure 44. Note that the enclosure 443 may be configured in the same manner as the enclosures 441 and 442.

[0074] Even if the bus bar 40a is configured in this manner, the power conversion device 100 can achieve the same effects as the above-described embodiment. Furthermore, the power conversion device 100 of the fourth modification can suppress noise leakage to the external space even without an interlock function.

[0075] Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also encompasses various modifications and modifications within the scope of equivalents. In addition, although various combinations and forms are shown in the present disclosure, other combinations and forms including only one element, more, or less than one element are also within the scope and spirit of the present disclosure. [Explanation of symbols]

[0076] 10...control device, 11...wiring board, 12 to 14...circuit elements, 15...board connector, 20...power module, 30...power bus bar, 40...wire, 44...enclosure, 50...casing, 56...connector opening, 60...cover, 71, 72...sealing members, 80...PN connector, 100...power conversion device

Claims

1. a circuit device (10, 20) including a noise source; a housing (50) having an accommodation space for accommodating the circuit device and having a through hole for communicating the accommodation space with an external space; a conductive member (40, 40a) that is electrically connected to the ground and forms an enclosure (44, 441, 442, 443), The power conversion device, wherein the conductive member has the enclosure disposed between a part of the through hole and the noise source.

2. The power conversion device according to claim 1 , wherein the enclosure is disposed opposite a part of the through hole in the direction in which the through hole penetrates.

3. The power conversion device according to claim 1 , wherein the enclosure is disposed on a straight line between a part of the through hole and the noise source.

4. the circuit device includes a power module having a plurality of semiconductor switching elements and a control device that controls the semiconductor switching elements, The power conversion device according to any one of claims 1 to 3, wherein at least one of the power module and the control device is the noise source.

5. a cover member (80) attached to the housing and electrically connected to the conductive member while covering the through-hole, The power conversion device according to claim 4 , wherein the conductive member is electrically connected to the ground of the control device.

6. A metal plate (90) is disposed in the storage space and fixed to the housing, The power conversion device according to claim 4 , wherein the conductive member is a bus bar connected to the metal plate serving as the ground.

7. The power conversion device according to any one of claims 1 to 3, wherein the surrounding portion has a triangular, rectangular or circular shape.

8. A power conversion device according to any one of claims 1 to 3, wherein a portion of the enclosure is positioned between a portion of the through hole and the noise source, and another portion is positioned away from the portion of the through hole and the noise source.

9. 4. The power conversion device according to claim 1, wherein the area of ​​the enclosure is set according to the frequency of the noise emitted from the noise source.

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