Power conversion device and motor

Abstract

The present application provides a kind of power conversion device capable of reducing the influence of electromagnetic wave on circuit substrate.Power conversion device (1) has circuit substrate (2), power conversion module (3) is oppositely arranged with circuit substrate (2), busbar (4) is connected with power conversion module (3), shielding electromagnetic wave shielding part (5).Busbar (4) extends to opposite side (S2) from one side (S1) of circuit substrate (2) through the side edge (21) of circuit substrate (2) along the thickness direction (Dt) of circuit substrate (2).Shielding part (5) is arranged between busbar (4) and the side edge (21) of circuit substrate (2), extends to opposite side (S2) from one side (S1) of circuit substrate (2) along the thickness direction (Dt) of circuit substrate (2), and extends to both sides of busbar (4) along the side edge (21) of circuit substrate (2).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power conversion device and a motor. BACKGROUND

[0002] Conventionally, a power conversion device used in a hybrid vehicle or an electric vehicle is known (see Patent Literature 1 below). The conventional power conversion device described in Patent Literature 1 takes as a subject the further improvement of the connection reliability of internal components of the power conversion device, and as a means for solving this subject, has a configuration as follows (see paragraphs 0007, 0008, claim 1, etc. of the document).

[0003] The conventional power conversion device has a power semiconductor module, a housing, an AC relay bus, and an AC terminal block. The power semiconductor module converts a direct current into an alternating current. The housing forms an accommodation space that accommodates the power semiconductor module. The AC relay bus is connected to an AC terminal of the power semiconductor module by fusion. The AC terminal block is connected to an AC terminal of a motor. The AC relay bus is supported on the housing via an insulating member, and the AC terminal block is connected to the AC relay bus and supported on the housing.

[0004] More specifically, both the AC relay bus and the AC terminal block are supported by a flow path forming body having a function as the housing. Therefore, a load applied at the time of mounting of the AC connector of the motor is dispersed to the flow path forming body via the AC terminal block. In addition, a load that is not dispersed by the AC terminal block is stress-dispersed from the AC bus to the flow path forming body via the AC relay bus. Thus, the load applied at the time of mounting of the AC connector of the motor is stress-dispersed in two stages before reaching the AC welding connection portion, and stress generated to the welding portion can be eliminated as much as possible (see paragraphs 0094, 0095, FIG. 13, etc. of the document).

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2014-176271 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] The conventional power conversion device described above can achieve the excellent effect of being able to further improve the connection reliability of internal components of the power conversion device. However, in such a power conversion device, with the further demand for miniaturization, the layout of components including a circuit board, a power conversion module, and a bus, etc. is restricted, and the influence of electromagnetic waves on the circuit board tends to increase.

[0010] This disclosure provides a power conversion device that can reduce the impact of electromagnetic waves on the circuit board and achieve miniaturization compared to the past, as well as a motor equipped with the power conversion device.

[0011] Technical means to solve the problem

[0012] One aspect of the power conversion device disclosed herein includes: a circuit board; a power conversion module disposed opposite to the circuit board; a busbar connected to the power conversion module; and a shielding portion that shields electromagnetic waves, wherein the busbar extends from one side of the circuit board through a side edge of the circuit board to the opposite side along the thickness direction of the circuit board, and the shielding portion is disposed between the busbar and the side edge of the circuit board, extends from the one side to the opposite side along the thickness direction of the circuit board, and extends along the side edge of the circuit board to both sides of the busbar.

[0013] The effects of the invention

[0014] According to the above-described method of this disclosure, a power conversion device and a motor equipped with the power conversion device can be provided that can reduce the impact of electromagnetic waves on the circuit board and achieve miniaturization compared to the past. Attached Figure Description

[0015] Figure 1 This is a perspective view showing one embodiment of the power conversion device and motor of the present disclosure.

[0016] Figure 2 yes Figure 1 An exploded perspective view of the power conversion device and motor shown.

[0017] Figure 3 It is along Figure 1 The diagram shows a cross-sectional view of the power conversion device and motor for line III-III.

[0018] Figure 4 yes Figure 3 The enlarged cross-sectional view near the busbar is shown.

[0019] Figure 5 It means Figure 4 Enlarged cross-sectional view of the deformed part enclosed by the dashed line in Example 1.

[0020] Figure 6 It means Figure 4 Enlarged cross-sectional view of the deformed part enclosed by the dotted line in Example 2.

[0021] Figure 7 It means Figure 4 Enlarged cross-sectional view of the deformed part enclosed by the dotted line in Example 3.

[0022] Figure 8 is a cross-sectional view of a modification example 4 of the portion surrounded by the dotted line in Figure 4

[0023] Figure 9 is a cross-sectional view of a modification example 5 of the power conversion device shown in Figure 4

[0024] Figure 10 is a perspective view of a state in which the bottom wall portion of the frame of the power conversion device shown in Figure 9

[0025] Figure 11 is an enlarged view of the portion surrounded by the dotted line in Figure 10

[0026] Figure 12 is a cross-sectional view of a modification example of the power conversion device 1 and the motor M of Figure 3 DETAILED DESCRIPTION

[0027] Embodiments of a power conversion module and a motor according to the present disclosure will be described below with reference to the drawings.

[0028] Figure 1 is a perspective view of an embodiment of a power conversion device and a motor according to the present disclosure. Figure 2 is an exploded perspective view of the power conversion device 1 and the motor M shown in Figure 1 Figure 3 is an enlarged cross-sectional view of the power conversion device 1 along the III-III line of Figure 1 Figure 4 is an enlarged view of the vicinity of the bus bar 4 of the power conversion device 1 shown in Figure 3

[0029] The motor M of the present embodiment is mounted on, for example, an electric vehicle (EV), a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), a fuel cell vehicle (FCV), or the like, and constitutes a drive device of the vehicle. The motor M is, for example, a power conversion device-integrated motor in which the power conversion device 1 is provided on a housing M1. The power conversion device-integrated motor has an advantage of enabling the drive device to be downsized, as compared with a configuration in which the motor M and the power conversion device 1 are separate.

[0030] In addition, the power conversion device 1 of the present embodiment is mounted on, for example, the housing M1 of the motor M, converts direct current supplied from a vehicle-mounted power source such as a lithium-ion secondary battery or a fuel cell into alternating current and supplies the alternating current to the motor M, and drives the motor M. The power conversion device 1 of the present embodiment is characterized by the following configuration, and details thereof will be described later.

[0031] ​​​​​​​​The power conversion device 1 includes a circuit board 2, a power conversion module 3 disposed opposite the circuit board 2, a bus bar 4 connected to the power conversion module 3, and a shield portion 5 that shields electromagnetic waves. The bus bar 4 extends along a thickness direction Dt of the circuit board 2 from one side S1 of the circuit board 2 to the opposite side S2 through a side edge 21 of the circuit board 2. The shield portion 5 is disposed between the bus bar 4 and the side edge 21 of the circuit board 2, extends along the thickness direction Dt of the circuit board 2 from the one side S1 of the circuit board 2 to the opposite side S2, and extends along the side edge 21 of the circuit board 2 to both sides of the bus bar 4.

[0032] The power conversion device 1 of the embodiment is described in detail below. The power conversion device 1 includes, in addition to the above-described configuration, a base portion 6 disposed between the circuit board 2 and the power conversion module 3, and a frame 7 that supports the base portion 6 and the circuit board 2.

[0033] The circuit board 2, which is mounted with, for example, the power conversion module 3, an IC, a transistor, a resistor, and the like, includes an electronic circuit for controlling the power conversion module 3. The circuit board 2 has, for example, a rectangular shape with a direction parallel to a drive shaft M2 of the motor M as a length direction, and a connector 22 is provided at a short side edge at one end in the length direction. The connector 22 is connected to a connector of an external wiring harness for supplying power to or inputting and outputting signals to the circuit board 2.

[0034] The power conversion module 3 internally includes a switching element, and performs mutual conversion of direct current and alternating current under control of the circuit board 2. A filter 31, a capacitor 32, a sensor 33, and the like are connected to the power conversion module 3. The sensor 33 detects, for example, the magnitude of current flowing from the power conversion module 3 to the bus bar 4, and transmits an electric signal of the detection result to the electronic circuit of the circuit board 2.

[0035] The bus bar 4 is a power wiring between the power conversion module 3 and a terminal M3 of the motor M, and is a power transmission path. The bus bar 4 can be composed of, for example, a metal plate having excellent electrical conductivity such as copper. Three bus bars 4 connected to the power conversion module 3 supply three-phase alternating current to the terminal M3 of the motor M. The bus bar 4 has, for example, a shape in which an elongated plate is bent into an L shape.

[0036] The bus bar 4 has, for example, a first portion that extends along a surface of the circuit board 2 on which components are mounted and is connected to the power conversion module 3 via the sensor 33, and a second portion that extends along a thickness direction Dt of the circuit board 2 and is connected to the terminal M3 of the motor M. The bus bar 4 is housed in the frame 7 except for an end portion of the second portion connected to the motor M, and the end portion of the second portion is exposed from the frame 7. The portion of the bus bar 4 housed in the frame is covered with a resin having electrical insulation, for example, by insert molding.

[0037] The shielding part 5 is a component for shielding electromagnetic waves. The shielding part 5 is disposed between the busbar 4 and the side edge 21 of the circuit board 2, extending from one side S1 to the opposite side S2 along the thickness direction Dt of the circuit board 2, and extending to both sides of the busbar 4 along the side edge 21 of the circuit board 2. The shielding part 5 is, for example, a plate-shaped metal component with a surface parallel to the thickness direction Dt of the circuit board 2 and the side edge 21 of the circuit board 2.

[0038] Although there are no specific restrictions, but Figures 1 to 4 In the embodiment shown, the thickness direction Dt of the circuit board 2 is orthogonal to the drive shaft M2 of the motor M, and the side edge 21 of the circuit board 2 of the motor M is parallel to the drive shaft M2 of the motor M. Additionally, as... Figure 2 As shown, in this embodiment, the shielding part 5 is cylindrical around the entire circumference of the through hole 61 of the base part 6, which will be described later.

[0039] like Figures 2 to 4 As shown, the shielding part 5 is, for example, part of the base part 6, and is integrally provided with the base part 6 by stamping, forging, casting or injection molding.

[0040] The shielding portion 5 protrudes from the base portion 6 toward the bottom wall portion 71 of the frame 7 from the side S1 of the circuit board 2 to the opposite side S2, passing through the side edge 21 of the circuit board 2, and extends in the thickness direction Dt of the circuit board 2.

[0041] The shielding portion 5, for example, has a conical shape in which the opening area decreases as the base end mounted on the base portion 6 moves further away from the base portion 6. In addition, the top end of the shielding portion 5 near the bottom wall portion 71 of the frame 7 is, for example, slightly conical, but the opening area of ​​the top end is almost constant in the thickness direction of the circuit board 2.

[0042] The base portion 6 is a component used to hold the circuit board 2 and fix it inside the frame 7. More specifically, the base portion 6 is disposed on the side S1 opposite to the bottom wall portion 71 of the frame 7 relative to the circuit board 2, and is a generally integral plate-shaped component covering the surface of the circuit board 2 on which electronic components are mounted. The base portion 6 is formed of a material capable of shielding electromagnetic waves, such as a metal plate or a resin plate with a metal layer on its surface.

[0043] The base portion 6 has, for example, a through hole 61 through which the busbar 4 passes. The through hole 61 of the base portion 6 is, for example, an elongated circular hole extending along the side edge 21 of the circuit board 2, with both ends being semi-circular. As described above, in the power conversion device 1 of this embodiment, the shielding portion 5 is, for example, cylindrical around the entire circumference of the through hole 61 of the base portion 6.

[0044] The base portion 6 has, for example, a protrusion-shaped support portion 62 for supporting the circuit board 2 on one face opposite the bottom wall portion 71 of the frame 7. The circuit board 2 is fastened to the support portion 62 by a fastening member such as a screw, for example, so as to be supported at an interval from the one face.

[0045] In addition, the base portion 6 supports, on a face on the side opposite the one face on which the circuit board 2 is supported, the power conversion module 3, the filter 31, the capacitor 32, the sensor 33, and the like. In addition, as shown in Figure 3 and Figure 4 The base portion 6 supports the bus bar 4 via the sensor 33 fixed to the base portion 6. That is, one end of the bus bar 4 is fixed to the sensor 33 by a fastening member such as a screw or nut, for example.

[0046] Thus, the bus bar 4 extends from the sensor 33 located on the inner side of the side edge 21 of the circuit board 2 to a position on the outer side of the side edge 21 in a direction intersecting the side edge 21 along the face of the circuit board 2 on which electronic components are mounted. In addition, the bus bar 4 extends from one side S1 of the circuit board 2 to the opposite side S2 through the side of the side edge 21 of the circuit board 2 in the thickness direction Dt of the circuit board 2 at a position on the outer side of the side edge 21 of the circuit board 2. Further, the bus bar 4 extends to the outside of the frame 7 through the through-hole 73 provided on the bottom wall portion 71 of the frame 7.

[0047] The frame 7 has, inside, a housing space for housing components that make up the power conversion device 1. The frame 7 has, for example, a bottom wall portion 71 and a cover 72 formed of a material having electrical conductivity such as metal. The bottom wall portion 71 is fixed to the housing M1 of the motor M by a fastening member such as a bolt, for example. The bottom wall portion 71 can also be provided integrally with the housing M1 as part of the housing M1 of the motor M, for example.

[0048] The bottom wall portion 71 has a flat bottom portion that defines the lower end of the housing space inside the frame 7, and a peripheral wall portion that rises in the thickness direction from the peripheral edge of the bottom portion. The bottom wall portion 71 has, for example, a through-hole 73 for the bus bar 4 to pass through on the outer edge portion of the flat bottom portion. The through-hole 73 of the frame 7 exposes the bus bar 4 inside the frame 7 to the outside of the frame 7, thereby constituting an interface portion of the power conversion device 1 with the motor M.

[0049] The interface portion of the power conversion device 1 is located on the opposite side S2 of the one side S1 of the circuit board 2 on which the base portion 6 is disposed. In addition, the shield portion 5 protrudes from the through-hole 61 of the base portion 6 to the through-hole 73 of the frame 7 constituting the interface portion of the power conversion device 1, and extends to the vicinity of the interface portion located on the opposite side S2 of the one side S1 of the circuit board 2 on which the base portion 6 is disposed.

[0050] The cover 72 has, for example, a flat upper wall portion that defines the receiving space inside the frame 7, and a side wall portion that extends from the periphery of the upper wall portion to the periphery of the bottom wall portion 71 and defines the receiving space inside the frame 7. The lower end face of the side wall portion of the cover 72 abuts against the upper end face of the periphery wall portion of the bottom wall portion 71. In this state, the periphery wall portion of the bottom wall portion 71 and the side wall portion of the cover 72 are fastened by fastening members such as bolts or nuts, thereby forming a frame 7 with an internal receiving space.

[0051] The motor M has a housing M1 equipped with a power conversion device 1 and a terminal M3 connected to the busbar 4. For example... Figure 2 and Figure 3 As shown, the housing M1 has: a connection port M11 connected to the through hole 73 of the frame 7; a terminal receiving chamber M12 for receiving the terminal M3; and an opening and closing port M13 for opening and closing the terminal receiving chamber M12. The terminal receiving chamber M12 is a recessed space provided on the housing M1. In addition, a sealing gasket M15 or a waterproof adhesive is disposed around the connection port M11, for example. The sealing gasket M15 or the waterproof adhesive seals the gap between the housing 7 of the power conversion device 1 and the housing M1 of the motor M, preventing water or the like from seeping into the connection port 11 from the outside.

[0052] By mounting the bottom wall 71 of the frame 7 onto the housing M1, a busbar 4 is inserted through the connection port M11. The terminal receiving chamber M12 communicates with the internal space of the frame 7 through the connection port M11 and the through hole 73 of the frame 7. The opening M13 is an opening provided on the housing M1 to expose the busbar 4 inserted into the terminal M3 and the terminal receiving chamber M12. After the busbar 4 is connected to the terminal M3, as... Figure 3 As shown, the opening M13 is closed by the cover M14.

[0053] The function of the motor M and the power conversion device 1 in this embodiment will be explained below.

[0054] Since the motor M is an integrated motor with the power conversion device 1, it has the advantage of miniaturizing the vehicle's drive unit compared to a configuration where the motor M and the power conversion device 1 are separate. On the other hand, a high-voltage circuit needs to be connected to the motor M's terminal M3, for example, via a busbar 4 extending from the inside of the housing 7 to the outside. This high-voltage circuit includes a power conversion module 3 that is conventionally connected to the motor M's terminal M3 via a wiring harness.

[0055] In such an integrated power conversion device motor M, the busbar 4 connecting the power conversion module 3 of the power conversion device 1 and the terminal M3 of the motor M often has to pass near the circuit board 2. Therefore, the requirements for technology to shield electromagnetic waves from the busbar 4 and reduce the impact of electromagnetic waves on the circuit board 2 are increased.

[0056] To meet such a requirement, the power conversion device 1 of the present embodiment includes: a circuit board 2; a power conversion module 3 disposed opposite the circuit board 2; a bus bar 4 connected to the power conversion module 3; and a shielding portion 5 that shields electromagnetic waves. The bus bar 4 extends along a thickness direction Dt of the circuit board 2 from one side S1 of the circuit board 2 to the opposite side S2 through a side edge 21 of the circuit board 2. The shielding portion 5 is disposed between the bus bar 4 and the side edge 21 of the circuit board 2, extends along the thickness direction Dt of the circuit board 2 from the one side S1 of the circuit board 2 to the opposite side S2, and extends along the side edge 21 of the circuit board 2 to both sides of the bus bar 4.

[0057] With such a configuration, in the power conversion device 1, electromagnetic waves from the bus bar 4 toward the circuit board 2 are shielded by the shielding portion 5, and malfunction of the circuit board 2 is prevented. More specifically, the bus bar 4 that extends along the thickness direction Dt of the circuit board 2 from the one side S1 of the circuit board 2 to the opposite side S2 through the side edge 21 of the circuit board 2 generates electromagnetic waves toward the circuit board 2. However, the shielding portion 5 is disposed between the bus bar 4 and the side edge 21 of the circuit board 2, extends along the thickness direction Dt of the circuit board 2 from the one side S1 of the circuit board 2 to the opposite side S2, and extends along the side edge 21 of the circuit board 2 to both sides of the bus bar 4.

[0058] With the shielding portion 5, electromagnetic waves from the bus bar 4 that extends along the thickness direction Dt of the circuit board 2 from the one side S1 of the circuit board 2 to the opposite side S2 through the side edge 21 of the circuit board 2 toward the circuit board 2 can be shielded. Therefore, according to the present embodiment, it is possible to provide the power conversion device 1 that can reduce the influence of electromagnetic waves on the circuit board 2 and achieve miniaturization compared to the past. In addition, by shielding electromagnetic waves emitted from the bus bar 4 and the circuit board 2 to the outside of the power conversion device 1 with the shielding portion 5 and the frame 7, it is possible to suppress emission of electromagnetic waves from the power conversion device 1 to the outside.

[0059] In addition, the power conversion device 1 of the present embodiment includes: a base portion 6 disposed between the circuit board 2 and the power conversion module 3; and a frame 7 that supports the base portion 6 and the circuit board 2. Also, the base portion 6 and the frame 7 each have a through-hole 61 and a through-hole 73 through which the bus bar 4 passes. With such a configuration, it is possible to shield electromagnetic waves from the power conversion module 3 toward the circuit board 2 with the base portion 6. In addition, the bus bar 4 connected to the power conversion module 3 can be exposed to the outside of the frame 7 by passing through the through-hole 61 of the base portion 6 and the through-hole 73 of the frame 7, and connected to the terminal M3 of the motor M.

[0060] Further, in the power conversion device 1 of the present embodiment, the shield portion 5 is provided in a cylindrical shape on the entire circumference of the through-hole 61 of the base portion 6. With this configuration, by the shield portion 5 of the cylindrical shape that surrounds the bus bar 4, the electromagnetic waves emitted from the bus bar 4 in all directions along the element mounting surface of the circuit board 2 can be more reliably shielded.

[0061] Further, the motor M of the present embodiment includes a housing M1 in which the power conversion device 1 is provided, and a terminal M3 connected to the bus bar 4 of the power conversion device 1. With this configuration, the motor M provided with the power conversion device 1 that can reduce the influence of electromagnetic waves on the circuit board 2 compared to the past and achieve miniaturization can be provided.

[0062] Further, in a case where the housing M1 includes a connection port M11 connected to the through-hole 73 of the frame body 7 for insertion of the bus bar 4, and a terminal housing chamber M12 that houses the bus bar 4 and the terminal M3, the bus bar 4 and the terminal M3 can be prevented from being exposed to the outside. Thereby, the electromagnetic waves emitted from the bus bar 4 to the outside of the power conversion device 1 and the housing M1, and the electromagnetic waves from the outside to the inside of the power conversion device 1 and the housing M1 are shielded, and the bus bar 4 can be prevented from being affected by the electromagnetic waves from the outside.

[0063] As described above, according to the present embodiment, the power conversion device 1 that can reduce the influence of electromagnetic waves on the circuit board 2 compared to the past and achieve miniaturization, and the motor M provided with the power conversion device 1 can be provided. Further, the power conversion device and the motor of the present disclosure are not limited to the configuration of the power conversion device 1 and the motor M described above. Hereinafter, referring to Figure 1 and Figure 3 , referring to Figure 2 and Figures 5 to 12 , a modification example of the above-described embodiment will be described.

[0064] Figure 5 is an enlarged sectional view of a modification example 1 of the portion P enclosed by the dashed line in Figure 4

[0065] In the above-described embodiment, as shown in Figure 4 , the inner bottom surface 75 of the bottom wall portion 71 of the housing space of the frame body 7 is flat. In contrast, in the modification example 1 shown in Figure 5 , the power conversion device 1 has an auxiliary shield portion 74 provided in a cylindrical shape around the through-hole 73 of the frame body 7 and extending toward the base portion 6. Further, in Figure 2 , an example in which the bottom wall portion 71 of the frame body 7 has the auxiliary shield portion 74 is shown.

[0066] Further, in Figure 5 ​In the power conversion device 1 of the modified example 1 shown, the top end of the shielding portion 5 is disposed inside the auxiliary shielding portion 74. More specifically, the cylindrical auxiliary shielding portion 74 protrudes from the surface of the bottom wall portion 71 of the frame 7 opposite to the circuit board 2 toward the base portion 6 in the thickness direction Dt of the circuit board 2. Similarly, the cylindrical shielding portion 5 protrudes from the surface of the base portion 6 opposite to the circuit board 2 toward the bottom wall portion 71 of the frame 7 in the thickness direction Dt of the circuit board 2.

[0067] Furthermore, the cross-sectional shape of the cylindrical auxiliary shielding portion 74 is approximately the same as that of the cylindrical shielding portion 5, and the external dimensions of the cylindrical shielding portion 5 are smaller than the internal dimensions of the cylindrical auxiliary shielding portion 74. Additionally, the height from the inner bottom surface 75 of the bottom wall portion 71 of the frame 7, where the through hole 73 is formed, to the top of the auxiliary shielding portion 74 is greater than the distance between the top of the shielding portion 5 and the inner bottom surface 75. With this configuration, the top of the shielding portion 5 is positioned inside the auxiliary shielding portion 74.

[0068] according to Figure 5 The power conversion device 1 of the modified example 1 shown can shield electromagnetic waves emitted from the busbar 4 from the gap between the top of the shielding part 5 and the inner bottom surface 75 of the frame 7 to the outside of the shielding part 5 through the auxiliary shielding part 74. Therefore, according to this modified example, a power conversion device 1 that further reduces the influence of electromagnetic waves on the circuit board 2 and achieves miniaturization can be provided.

[0069] Figure 6 It means Figure 4 Enlarged cross-sectional view of the deformed portion P enclosed by the dashed line in Example 2.

[0070] In this modified power conversion device 1, the cylindrical auxiliary shielding part 74 is disposed inside the top end of the cylindrical shielding part 5. More specifically, with Figure 5 In contrast to the modified example 1 shown, the external dimensions of the cylindrical auxiliary shielding portion 74 are smaller than the internal dimensions of the cylindrical shielding portion 5. With this configuration, the auxiliary shielding portion 74 is disposed inside the top end of the shielding portion 5.

[0071] according to Figure 6 The power conversion device 1 of the modified example 2 shown is, with Figure 5 Similarly, in the power conversion device 1 of the modified example 1 shown, the auxiliary shielding portion 74 can shield electromagnetic waves emitted from the busbar 4 from the gap between the top of the shielding portion 5 and the inner bottom surface 75 of the frame 7 to the outside of the shielding portion 5. Therefore, according to this modified example, a power conversion device 1 that further reduces the influence of electromagnetic waves on the circuit board 2 and achieves miniaturization can be provided. In addition, as Figure 3As shown, a gasket M15 that seals the gap between the frame 7 and the motor Ml is sometimes arranged around the through-hole 73 of the frame 7 of the power conversion device 1. In this case, by providing the gasket M15, the gap between the frame 7 and the motor Ml is sealed, and the waterproofness of the power conversion device 1 is improved. Figure 6 As shown, the auxiliary shielding portion 74 enables the rigidity and mechanical strength of the portion of the bottom wall portion 71 of the frame 7 that is pressed on the gasket M15 to be improved. Thus, the deformation of the bottom wall portion 71 of the frame 7 can be prevented, and the gasket M15 can be given sufficient compression force by the bottom wall portion 71, improving the waterproofness and reliability of the power conversion device 1.

[0072] Figure 7 is an enlarged sectional view of a modification 3 of the portion P enclosed by the dotted line in FIG. 6. Figure 4

[0073] In the power conversion device 1 of the present modification, the top end of the shielding portion 5 is in contact with the periphery of the through-hole 73 of the frame 7. Alternatively, the top end of the shielding portion 5 can be in contact with the periphery of the through-hole 73 of the frame 7 via a conductive adhesive.

[0074] According to the power conversion device 1 of the modification 3 shown in FIG. 7, the gap between the top end of the shielding portion 5 and the inner bottom surface 75 of the frame 7 can be eliminated, and the electromagnetic waves emitted from the bus bar 4 to the outside of the shielding portion 5 can be more reliably shielded by the shielding portion 5. Thus, according to the present modification, a power conversion device 1 that is further reduced in size while reducing the influence of electromagnetic waves on the circuit board 2 can be provided. Figure 8

[0075] Figure 4 is an enlarged sectional view of a modification 4 of the portion P enclosed by the dotted line in FIG. 6. Figure 4 In the power conversion device 1 of the present modification, the shielding portion 5 is not provided on the base portion 6, but is provided in a cylindrical shape on the entire periphery of the through-hole 73 of the frame 7. With this configuration, the same effects as those of the embodiment shown in FIG. 6 can be achieved. In addition, the base end portion of the cylindrical shielding portion 5 that is connected to the inner bottom surface 75 of the frame 7 is provided in a tapered shape, and the opening area decreases as it approaches the base portion 6. In addition, the top end portion of the cylindrical shielding portion 5 on the side opposite the base end portion has substantially the same opening area in the thickness direction Dt of the circuit board 2.

[0076] Figure 9 Further, in the power conversion device 1 of the present modification, the top end portion of the shielding portion 5 is inserted into the through-hole 61 of the base portion 6. With this configuration, the electromagnetic waves emitted from the bus bar 4 between the base portion 6 and the inner bottom surface 75 of the frame 7 can be more reliably shielded by the shielding portion 5.

[0077]

[0078] ​​​​According to the present modified example, therefore, the power conversion device 1 can be further reduced in size while reducing the influence of electromagnetic waves on the circuit board 2.

[0079] Figure 4 is Figure 10 is a cross-sectional view of a modified example 5 of the power conversion device 1. Figure 9 is a perspective view of the power conversion device 1 of the modified example 5 with the bottom wall portion 71 removed by reversing the frame 7 upside down. Figure 11 is a perspective view of the power conversion device 1 of the modified example 5 with the bottom wall portion 71 removed by reversing the frame 7 upside down. Figure 10 is Figures 9 to 11 is an enlarged view of a portion XI surrounded by a dotted line in FIG. 26. The power conversion device 1 of the present modified example has a signal line 23 connected to the circuit board 2. The signal line 23 is connected to, for example, the sensor 33, the bus bar 4, or the like. The signal line 23 is held between the shield portion 5 and the frame 7.

[0080] According to the power conversion device 1 of the modified example 5, a space for guiding the signal line 23 can be formed between the shield portion 5 and the frame 7, and the signal line 23 can be held between the shield portion 5 and the frame 7. Thus, the signal line 23 can be protected from electromagnetic waves by the shield portion 5 and the frame 7, and superimposed noise on the signal line 23 can be suppressed. Figure 12

[0081] Figure 3 is a cross-sectional view of a modified example of the power conversion device 1 and the motor M of FIG. 1. In the present modified example, the bus bar 4 has a first portion connected to the power conversion module 3 via the sensor 33, and a second portion provided integrally with the terminal M3 of the motor M. In addition, the frame 7 has an opening portion 76 for connecting the first portion and the second portion of the bus bar 4. The opening portion 76 is closed by a cover not shown in the drawing after the first portion and the second portion of the bus bar 4 are connected. In the present modified example, the same effects as the power conversion device 1 and the motor M of the embodiment of FIG. 1 can also be obtained. Figure 3 ​

[0082] The above describes the embodiment of the power conversion device and the motor of the present disclosure in detail using the drawings, but the specific configuration is not limited to this embodiment, and even if there are design changes or the like within the scope of the gist of the present disclosure, these are also included in the present disclosure.

[0083] Symbol Explanation

[0084] 1 power conversion device

[0085] 2 circuit board

[0086] 21 side edge

[0087] 23 signal line

[0088] 3 power conversion module​​​

[0089] 4 bus bar

[0090] 5 shield portion

[0091] 6 base portion

[0092] 61 through hole

[0093] 7 frame

[0094] 73 through hole

[0095] 74 auxiliary shield portion

[0096] Dt thickness direction

[0097] M motor

[0098] M1 housing

[0099] M3 terminal

[0100] S1 one side

[0101] S2 opposite side

Claims

1. A power conversion device, characterized by, Possessing: a circuit substrate; a power conversion module disposed opposite the circuit substrate; a bus bar connected to the power conversion module; a shield portion that shields electromagnetic waves; a base portion disposed between the circuit substrate and the power conversion module; and a frame that supports the base portion and the circuit substrate, the bus bar extends along a thickness direction of the circuit substrate from one side of the circuit substrate to the opposite side through a side edge of the circuit substrate, the shield portion is disposed between the bus bar and the side edge of the circuit substrate, extends from the one side to the opposite side along the thickness direction of the circuit substrate, and extends along the side edge of the circuit substrate to both sides of the bus bar, the base portion and the frame each have a through hole through which the bus bar passes, the shield portion is provided in a cylindrical shape on the entire circumference of the through hole of the base portion, further comprising an auxiliary shield portion provided in a cylindrical shape around the through hole of the frame and extending toward the base portion.

2. The power conversion device according to claim 1, wherein a tip end of the shield portion is disposed inside the auxiliary shield portion.

3. The power conversion device according to claim 1, wherein the auxiliary shield portion is disposed inside a tip end portion of the shield portion.

4. The power conversion device according to claim 1, wherein a tip end of the shield portion is in contact with the circumference of the through hole of the frame.

5. The power conversion device according to claim 1, wherein the shield portion is provided in a cylindrical shape on the entire circumference of the through hole of the frame.

6. The power conversion device according to claim 5, wherein a tip end portion of the shield portion is inserted into the through hole of the base portion.

7. The power conversion device according to any one of claims 1 to 6, characterized by, having a signal line connected to the circuit substrate, the signal line is held between the shield portion and the frame.

8. A motor characterized by Possessing: a housing provided with the power conversion device according to any one of claims 1 to 7; and a terminal connected to the bus bar.

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