POWER TRANSFORMATION DEVICE AND MOTOR

Abstract

Power conversion device (1) comprising: a printed circuit board (2); a power conversion module (3) arranged so that it faces the printed circuit board (2); a busbar (4) connected to the power conversion module (3); and a shielding section (5) that shields against electromagnetic waves, wherein the busbar (4) extends from one side along a thickness direction of the printed circuit board (2) through a side edge (21) of the printed circuit board (2) to an opposite side of the printed circuit board (2) and wherein the shielding section (5) is arranged between the busbar (4) and the side edge (21) of the printed circuit board (2), extends from one side along the thickness direction of the printed circuit board (2) to the opposite side and extends along the side edge (21) of the printed circuit board (2) to both sides of the busbar (4).

Description

Technical field

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

[0002] A power conversion device used for a hybrid or electric vehicle is known in the prior art (see PTL 1 below). A conventional power conversion device described in PTL 1 has the objective of further improving the interconnect reliability of the internal components of the power conversion device and has the following configuration as a means of solving this objective (see PTL 1, paragraphs 0007, 0008, claim 1 and the like).

[0003] The conventional power conversion device comprises a power semiconductor module, a housing, an AC relay busbar, and an AC terminal block. The power semiconductor module converts direct current (DC) into alternating current (AC). The housing provides a storage space for the power semiconductor module. The AC relay busbar is connected to an AC terminal of the power semiconductor module via a fusible link. The AC terminal block is connected to an AC terminal of a motor. The AC relay busbar is supported by an insulating element within the housing, with the AC terminal block being connected to and supported by the AC relay busbar within the housing.

[0004] More precisely, both the AC relay busbar and the AC terminal block are supported by a flow-path-forming body that functions as a housing. Therefore, a load applied when the motor's AC connector is connected is distributed via the AC terminal block to this flow-path-forming body. Furthermore, any load not distributed by the AC terminal block is subjected to a voltage distribution from the AC busbar, via the AC relay busbar, to this flow-path-forming body.As a result, the voltage is distributed in two stages before the load applied when the motor's AC connector is connected reaches the welded AC connection section, thus eliminating as much as possible the voltage generated in the welded section (see PTL 1, paragraph 0094, paragraph 0095). Fig. 13 and the like). List of oppositions patent literature

[0005] PTL 1: JP 2014-176271 A Summary of the invention: Technical problem

[0006] The conventional power conversion device described above can achieve excellent results in further improving the interconnect reliability of its internal components. However, the need for further miniaturization in such a device imposes limitations on the arrangement of components, including a printed circuit board, power conversion module, busbar, and the like, while the influence of electromagnetic waves on the circuit board tends to increase.

[0007] The present disclosure provides a power conversion device that can be miniaturized, thereby reducing the influence of electromagnetic waves on a printed circuit board compared to the prior art, and a motor that incorporates the power conversion device. Solution to the problem

[0008] One aspect of the present disclosure is a power conversion device comprising a printed circuit board, a power conversion module arranged to face the printed circuit board, a busbar connected to the power conversion module, and a shielding section shielding an electromagnetic wave, wherein the busbar extends from one side along a thickness direction of the printed circuit board through a side edge of the printed circuit board to an opposite side of the printed circuit board, and wherein the shielding section is arranged between the busbar and the side edge of the printed circuit board, extends from one side along the thickness direction of the printed circuit board to the opposite side, and extends along the side edge of the printed circuit board to both sides of the busbar. Advantageous effects of the invention

[0009] According to the above aspect of the present disclosure, it is possible to create a power conversion device that can be miniaturized, whereby the influence of electromagnetic waves on a printed circuit board is reduced compared to the prior art, and a motor that incorporates the power conversion device. Brief description of the drawing Fig. Figure 1 is a perspective view showing an embodiment of a power conversion device and motor of the present disclosure. Fig. Figure 2 is a perspective exploded view of the power conversion device and motor, which is located in Fig. 1 are illustrated. Fig. 3 is one along the in Fig. 1 illustrated by line III-III, cross-sectional view of the power conversion device and motor. Fig. 4 is an enlarged cross-sectional view of the area surrounding the in Fig. 3 illustrated busbars. Fig. Figure 5 is an enlarged cross-sectional view showing an initial modification of a section that was in Fig. 4 is surrounded by a dotted line. Fig. Figure 6 is an enlarged cross-sectional view showing a second modification of a section that was in Fig. 4 is surrounded by a dotted line. Fig. Figure 7 is an enlarged cross-sectional view showing a third modification of a section that was in Fig. 4 is surrounded by a dotted line. Fig. Figure 8 is an enlarged cross-sectional view showing a fourth modification of a section that was in Fig. 4 is surrounded by a dotted line. Fig. 9 is an enlarged cross-sectional view of a fifth modification of the in Fig. 4 illustrated power conversion device. Fig. Figure 10 is a perspective view of a state in which a floor wall section of a housing of the in Fig. The power conversion devices shown in the 9 illustrations are removed. Fig. 11 is an enlarged view of a section that is in Fig. 10 is surrounded by a dotted line. Fig. Figure 12 is a cross-sectional view showing a modification of a power conversion device 1 and a motor M in Fig. 3 illustrated. Description of the embodiments

[0010] In the following, embodiments of a power conversion module and a motor of the present disclosure are described with reference to the drawings.

[0011] Fig. Figure 1 is a perspective view illustrating an embodiment of a power conversion device and a motor according to the present disclosure. Fig. Figure 2 is a perspective exploded view of a power conversion device 1 and a motor M, which are located in Fig. 1 are illustrated. Fig. 3 is one along line III-III to Fig. 1 Enlarged cross-sectional view of the power conversion device 1. Fig. Figure 4 is an enlarged view of the surroundings of a busbar 4 of the in Fig. 3 illustrated power conversion device 1.

[0012] The motor M of the present embodiment is mounted on a vehicle, such as an electric vehicle (EV), a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), or a fuel cell vehicle (FCV), and forms a drive unit for the vehicle. The motor M is, for example, a motor with an integrated power conversion device, in which the power conversion device 1 is attached to a housing M1. The motor with an integrated power conversion device has the advantage that the drive unit can be miniaturized compared to a configuration in which the motor M and the power conversion device 1 are separate.

[0013] Additionally, the power conversion device 1 of the present embodiment is, for example, attached to the housing M1 of the motor M, converting a direct current supplied by an internal vehicle power supply, such as a lithium-ion secondary battery or a fuel cell, into an alternating current, supplying the alternating current to the motor M, and driving the motor M. Although the details are described later, the power conversion device 1 of the present embodiment has the following configuration.

[0014] The power conversion device 1 comprises a printed circuit board 2, a power conversion module 3 arranged facing the printed circuit board 2, a busbar 4 connected to the power conversion module 3, and a shielding section 5 that shields an electromagnetic wave. The busbar 4 extends from one side S1 through the side edge 21 of the printed circuit board 2 along the thickness direction Dt of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2. The shielding section 5 is arranged between the busbar 4 and the side edge 21 of the printed circuit board 2, extends from one side S1 along the thickness direction Dt of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2, and extends along the side edge 21 of the printed circuit board 2 to both sides of the busbar 4.

[0015] The configuration of the power conversion device 1 of the present embodiment is described in detail below. In addition to the configuration described above, the power conversion device 1 includes, for example, a base unit 6, which is arranged between the printed circuit board 2 and the power conversion module 3, and a housing 7, which supports the base unit 6 and the printed circuit board 2.

[0016] The circuit board 2 includes, for example, the power conversion module 3, an IC, a transistor, a resistor, and the like. The circuit board 2 also contains an electronic circuit for controlling the power conversion module 3. The circuit board 2 has, for example, a rectangular shape, the longitudinal direction of which is parallel to the drive shaft M2 of the motor M. A connector 22 is provided on a short side edge at one end in the longitudinal direction. The connector 22 is connected to a connector of an external cable harness for supplying power to the circuit board 2 and for inputting and outputting signals.

[0017] The power conversion module 3 contains a switching element and is controlled by the circuit board 2 to perform a conversion between direct current and alternating current. A filter 31, a capacitor 32, a sensor 33, and similar components are connected to the power conversion module 3. The sensor 33 detects, for example, the magnitude of the current flowing from the power conversion module 3 to the busbar 4 and sends an electrical signal of the detection result to the electronic circuitry of the circuit board 2.

[0018] Busbar 4 is a power connection between power conversion module 3 and terminal M3 of motor M and serves as a power transmission path. Busbar 4 can be made, for example, from a metal plate with excellent conductivity, such as copper. The three busbars 4 connected to power conversion module 3 supply three-phase alternating current to terminal M3 of motor M. Busbar 4 has, for example, a shape in which an elongated plate is bent into an L-shape.

[0019] The busbar 4 has, for example, a first section extending along the front and back surfaces of the printed circuit board 2 as the element mounting surfaces and connected to the power conversion module 3 via the sensor 33, and a second section extending along the thickness direction Dt of the printed circuit board 2 and connected to terminal M3 of the motor M. The busbar 4 is housed in the enclosure 7, except for the end of the second section connected to the motor M, which is exposed by the enclosure 7. The section of the busbar 4 housed in the enclosure is covered, for example, by overmolding with an electrically insulating resin.

[0020] The shielding section 5 is an element that shields an electromagnetic wave. The shielding section 5 is arranged between the busbar 4 and the side edge 21 of the printed circuit board 2, extends from one side S1 along the thickness direction Dt of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2, and extends along the side edge 21 of the printed circuit board 2 to both sides of the busbar 4. The shielding section 5 is, for example, a plate-like element made of metal along a surface parallel to the thickness direction Dt of the printed circuit board 2 and the side edge 21 of the printed circuit board 2.

[0021] Although it is not particularly restricted, in the present embodiment, which is described in the Fig. As illustrated in Figures 1 to 4, the thickness direction Dt of the circuit board 2 is orthogonal to the drive shaft M2 of the motor M, with the side edge 21 of the circuit board 2 of the motor M being parallel to the drive shaft M2 of the motor M. As shown in Fig. As illustrated in Figure 2, in the present embodiment the shielding section 5 has a tube shape around the entire circumference of a through-hole 61 of the base unit 6 described later.

[0022] As in the Fig. As illustrated in Figures 2 to 4, the shielding section 5 is, for example, a part of the base unit 6, being provided as a single piece with the base unit 6 by means of compression molding, forging, casting, injection molding or the like.

[0023] The shielding section 5, for example, extends from the surface of the base unit 6 facing the circuit board 2 in the direction of the bottom wall section 71 of the housing 7, runs through the side of the side edge 21 of the circuit board 2 from one side S1 to the opposite side S2 of the circuit board 2 and extends in the thickness direction Dt of the circuit board 2.

[0024] The shielding section 5, for example, has a tapered shape, with the opening area decreasing as the proximal end section attached to the base unit 6 moves further away from the base unit 6. Additionally, the distal end section of the shielding section 5 near the bottom wall section 71 of the housing 7 has a slightly tapered shape, but the opening area of ​​the distal end section hardly changes in the thickness direction of the printed circuit board 2 and remains essentially constant.

[0025] The base unit 6 is an element for holding and securing the printed circuit board 2 within the housing 7. More specifically, the base unit 6 is a plate-like element located on one side S1 of the printed circuit board 2, away from the bottom wall section 71 of the housing 7, and substantially covers the entire surface of the printed circuit board 2 on which the electronic components are mounted. The base unit 6 is made of a material capable of shielding electromagnetic waves, such as a metal plate or a resin plate with a metal layer on its surface.

[0026] The base unit 6 has, for example, the through-hole 61 through which the busbar 4 runs. The through-hole 61 of the base unit 6 extends, for example, along the side edge 21 of the circuit board 2 and has both end sections in the form of a semicircular, round elongated hole. As described above, in the power conversion device 1 of the present embodiment, the shielding section 5 has, for example, a tube shape around the entire circumference of the through-hole 61 of the base unit 6.

[0027] The base unit 6 has, for example, a projecting support section 62 for supporting the printed circuit board 2 on a surface facing the bottom wall section 71 of the housing 7. The base unit 6 supports the printed circuit board 2, for example, by fastening the printed circuit board 2 to the support section 62 with a fastening element, such as a screw.

[0028] Additionally, the base unit 6 has a surface opposite the surface on which the circuit board 2 is mounted, and which carries and secures the power conversion module 3, the filter 31, the capacitor 32, the sensor 33, and the like. As shown in the Fig. 3 and Fig. As illustrated in Figure 4, the base unit 6 carries the busbar 4 over the sensor 33 attached to the base unit 6. That is, one end of the busbar 4 is fastened to the sensor 33 by a fastening element, such as a screw or a nut.

[0029] As a result, the busbar 4 extends in a direction that intersects the side edge 21, from the sensor 33, which is located within the side edge 21 of the printed circuit board 2, along the surface of the printed circuit board 2 on which the electronic components are mounted, to a position outside the side edge 21. Additionally, at a position outside the side edge 21 of the printed circuit board 2, the busbar 4 extends from one side S1 through the side of the side edge 21 of the printed circuit board 2 in the thickness direction Dt of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2. Furthermore, the busbar 4 passes through the through-hole 73 provided in the bottom wall section 71 of the housing 7 and extends to the outside of the housing 7.

[0030] The housing 7 has a receiving space for components that form the power conversion device 1. The housing 7 has, for example, a bottom wall section 71 and a cover 72, which is made of a conductive material, such as metal. The bottom wall section 71 is attached to the housing M1 of the motor M, for example, by a fastening element, such as a screw. The bottom wall section 71 can, for example, be formed integrally with the housing M1 as part of the housing M1 of the motor M.

[0031] The bottom wall section 71 has a plate-shaped bottom section that defines a lower end of the receiving space within the housing 7, and a circumferential wall section raised in the thickness direction at a circumferential edge of the bottom section. The bottom wall section 71 has the through-hole 73, through which the busbar 4 passes, e.g., at an outer edge section of a plate-shaped bottom section. The through-hole 73 of the housing 7, by exposing the busbar 4 within the housing 7 to the outside of the housing 7, forms an interface section between the power conversion device 1 and the motor M.

[0032] The interface section of the power conversion device 1 is located on the opposite side S2 of the printed circuit board 2 from side S1, on which the base unit 6 is arranged. Additionally, the shielding section 5 projects from a through-hole 61 of the base unit 6 towards a through-hole 73 of the housing 7, which forms the interface section of the power conversion device 1, and extends to the vicinity of the interface section located on the opposite side S2 of the printed circuit board 2 from side S1, on which the base unit 6 is arranged.

[0033] The cover 72 includes, for example, a plate-like upper wall section that defines an upper end of the receiving space inside the housing 7, and a side wall section that extends from a circumferential edge of the upper wall section toward a circumferential edge section of the bottom wall section 71, defining a side end of the receiving space of the housing 7. The lower end face of the side wall section of the cover 72 is in contact with the upper end face of the circumferential wall section of the bottom wall section 71. In this state, the circumferential wall section of the bottom wall section 71 and the side wall section of the cover 72 are fastened by a fastener, such as a screw and nut, thus configuring the housing 7 with a receiving space therein.

[0034] The motor M includes the housing M1, to which the power conversion device 1 is attached, and the terminal M3, which is connected to the busbar 4. As shown in the Fig. 2 and Fig. As illustrated in Figure 3, the housing M1 includes a connecting opening M11 connected to the through-hole 73 of the housing 7, a terminal receiving chamber M12 that receives the terminal M3, and an opening / closing opening M13 that opens and closes the terminal receiving chamber M12. The terminal receiving chamber M12 is a recessed space provided in the housing M1. Furthermore, a seal M15 or a waterproof adhesive, for example, is arranged around the connecting opening M11. The seal M15 or the waterproof adhesive seals a gap between the housing 7 of the power conversion device 1 and the housing M1 of the motor M and prevents water or the like from penetrating the connecting opening 11 from the outside.

[0035] When the bottom wall section 71 of the housing 7 is attached to the housing M1, the busbar 4 is inserted through the connecting opening M11 into the terminal receiving chamber M12, the terminal receiving chamber M12 being connected to the interior of the housing 7 through the connecting opening M11 and the through-hole 73 of the housing 7. The opening / closing opening M13 is an opening provided in the housing M1 to expose the terminal M3 and the busbar 4 inserted into the terminal receiving chamber M12, and is closed by a cover M14, as shown in Fig. Figure 3 illustrates this after the busbar 4 has been connected to terminal M3.

[0036] The functions of the motor M and the power conversion device 1 of the present embodiment are described below.

[0037] Because the motor M is an integrated power conversion device, in which the power conversion device 1 is provided as a single unit, there is the advantage that the vehicle's drive system can be miniaturized compared to a configuration in which the motor M and the power conversion device 1 are separate. On the other hand, it is necessary that a high-voltage circuit containing the power conversion module 3, which is conventionally connected to terminal M3 of the motor M via a wiring harness, is connected to terminal M3 of the motor M, for example, via the busbar 4 extending from the inside to the outside of the housing 7.

[0038] In such a motor M with an integrated power conversion device, it is often necessary for the busbar 4, which connects the power conversion module 3 of the power conversion device 1 and the terminal M3 of the motor M, to run close to the circuit board 2. Therefore, there is an increasing need for a technique to shield the electromagnetic wave from the busbar 4 in order to reduce the influence of the electromagnetic wave on the circuit board 2.

[0039] In response to such a requirement, the power conversion device 1 in the present embodiment comprises the printed circuit board 2, the power conversion module 3, which is arranged facing the printed circuit board 2, the busbar 4, which is connected to the power conversion module 3, and the shielding section 5, which shields an electromagnetic wave. The busbar 4 extends from one side S1 along the thickness direction Dt of the printed circuit board 2 through the side edge 21 of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2. The shielding section 5 is arranged between the busbar 4 and the side edge 21 of the printed circuit board 2, extends from one side S1 along the thickness direction Dt of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2, and extends along the side edge 21 of the printed circuit board 2 to both sides of the busbar 4.

[0040] In such a configuration, the electromagnetic wave from the busbar 4 towards the printed circuit board 2 is shielded by the shielding section 5 in the power conversion device 1, thus preventing a malfunction of the printed circuit board 2. More specifically, the busbar 4, which extends from one side S1 along the thickness direction Dt of the printed circuit board 2 through the side edge 21 of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2, generates an electromagnetic wave towards the printed circuit board 2. The shielding section 5, however, is arranged between the busbar 4 and the side edge 21 of the printed circuit board 2, extends from one side S1 along the thickness direction Dt of the printed circuit board 2 to the opposite side S2 of the printed circuit board 2, and extends along the side edge 21 of the printed circuit board 2 to both sides of the busbar 4.

[0041] The shielding section 5 can shield the electromagnetic wave from the busbar 4, which extends from one side S1 along the thickness direction Dt of the printed circuit board 2 through the side edge 21 of the printed circuit board 2 towards the opposite side S2 of the printed circuit board 2. Therefore, according to the present embodiment, it is possible to create the power conversion device 1, which reduces the influence of the electromagnetic wave on the printed circuit board 2 and allows for miniaturization compared to the conventional case. Additionally, the electromagnetic wave emitted from the busbar 4 and the printed circuit board 2 to the outside of the power conversion device 1 can be shielded by the shielding section 5 and the housing 7 to suppress the emission of the electromagnetic wave from the power conversion device 1 to the outside.

[0042] In addition, the power conversion device 1 of the present embodiment includes the base unit 6, which is arranged between the circuit board 2 and the power conversion module 3, and the housing 7, which supports the base unit 6 and the circuit board 2. The base unit 6 and the housing 7 have the through-hole 61 and the through-hole 73, respectively, through which the busbar 4 passes. In this configuration, the electromagnetic wave from the power conversion module 3 towards the circuit board 2 can be shielded by the base unit 6. Furthermore, the busbar 4 connected to the power conversion module 3 can be exposed to the outside of the housing 7 through the through-hole 61 of the base unit 6 and the through-hole 73 of the housing 7 and connected to the terminal M3 of the motor M.

[0043] In the power conversion device 1 of the present embodiment, the shielding section 5 has a tubular shape around the entire circumference of the through-hole 61 of the base unit 6. In this configuration, the tubular shielding section 5, which surrounds the busbar 4, can more reliably shield the electromagnetic wave emitted by the busbar 4 in any direction along the element mounting surface of the printed circuit board 2.

[0044] Additionally, the motor M of the present embodiment includes the housing M1, to which the power conversion device 1 is attached, and the terminal M3, which is connected to the busbar 4 of the power conversion device 1. With this configuration, it is possible to create the motor M, which contains the power conversion device 1, that can reduce the influence of the electromagnetic wave on the printed circuit board 2 and can be miniaturized compared to the prior art.

[0045] If the housing M1 contains the connecting opening M11, which is connected to the through-hole 73 of the housing 7 and into which the busbar 4 is inserted, and the terminal receiving chamber M12, which receives the busbar 4 and the terminal M3, it is additionally possible to prevent the busbar 4 and the terminal M3 from being exposed to the outside. As a result, the electromagnetic wave emitted from the busbar 4 to the outside of the power conversion device 1 and the housing M1 is shielded, and the electromagnetic wave is shielded from the outside to the inside of the power conversion device 1 and the housing M1, thus preventing the busbar 4 from being affected by the electromagnetic wave from the outside.

[0046] As described above, according to the present embodiment, it is possible to create the power conversion device 1, which can reduce the influence of the electromagnetic wave on the printed circuit board 2 compared to the prior art and enable miniaturization, and the motor M, which incorporates the power conversion device 1. It is stated that the power conversion device and the motor according to the present disclosure are not limited to the configurations of the power conversion device 1 and the motor M described above. Modifications of the embodiment described above with respect to the Fig. 2 and 5 to 12 supported by the Fig. 1 and Fig. 3 described.

[0047] Fig. Figure 5 is an enlarged cross-sectional view illustrating a first modification of section P, which is shown in Fig. 4 is surrounded by a dotted line.

[0048] In the embodiment described above, as it appears in Fig. As illustrated in Figure 4, the inner bottom surface 75 of the bottom wall section 71, which faces the receiving space of the housing 7, is flat. On the other hand, the power conversion device 1 in the Fig. Figure 5 of the first modification illustrates an auxiliary shielding section 74, which has a tube shape around the through-hole 73 of the housing 7 and extends towards the base unit 6. Fig. Figure 2 illustrates an example where the bottom wall section 71 of the housing 7 contains the auxiliary shielding section 74.

[0049] Additionally, at the in Fig. Figure 5 illustrates the power conversion device 1 of the first modification, in which the distal end of the shielding section 5 is arranged within the auxiliary shielding section 74. More specifically, the tubular auxiliary shielding section 74 projects from the surface of the bottom wall section 71 of the housing 7, which faces the printed circuit board 2, in the direction of the base unit 6 in the thickness direction Dt of the printed circuit board 2. Additionally, the tubular shielding section 5 projects from the surface of the base unit 6, which faces the printed circuit board 2, in the direction of the bottom wall section 71 of the housing 7 in the thickness direction Dt of the printed circuit board 2.

[0050] The cross-sectional shape of the tubular auxiliary shielding section 74 and the cross-sectional shape of the tubular shielding section 5 are essentially the same, with the outer dimension of the tubular shielding section 5 being smaller than the inner dimension of the tubular auxiliary shielding section 74. The height from the inner bottom surface 75 of the bottom wall section 71 of the housing 7, where the through-hole 73 is formed, to the distal end of the auxiliary shielding section 74 is greater than the gap between the distal end of the shielding section 5 and the inner bottom surface 75. In such a configuration, the distal end of the shielding section 5 is located inside the auxiliary shielding section 74.

[0051] According to the in Fig. In the power conversion device 1 of the first modification, illustrated in Figure 5, the electromagnetic wave from the busbar 4, which is emitted from the gap between the distal end of the shielding section 5 and the inner bottom surface 75 of the housing 7 to the outside of the shielding section 5, can be shielded by the auxiliary shielding section 74. Therefore, according to the present modification, it is possible to create the power conversion device 1, which can further reduce the influence of the electromagnetic wave on the printed circuit board 2 and enable miniaturization.

[0052] Fig. Figure 6 is an enlarged cross-sectional view illustrating a second modification of section P, which is shown in Fig. 4 is surrounded by a dotted line.

[0053] In the power conversion device 1 of the present modification, the tubular auxiliary shielding section 74 is arranged within the distal end section of the tubular shielding section 5. In particular, in contrast to the one described in Fig. Figure 5 of the first modification illustrates that the outer dimension of the tubular auxiliary shielding section 74 is smaller than the inner dimension of the tubular shielding section 5. In such a configuration, the auxiliary shielding section 74 is arranged within the distal end section of the shielding section 5.

[0054] According to the in Fig. The power conversion device 1 of the second modification, illustrated in section 6, can be used, as in the case described in Fig. Figure 5 illustrates the power conversion device 1 of the first modification, in which the electromagnetic wave emitted from the busbar 4 through the gap between the distal end of the shielding section 5 and the inner bottom surface 75 of the housing 7 to the outside of the shielding section 5 is shielded by the auxiliary shielding section 74. Therefore, according to the present modification, it is possible to create the power conversion device 1, which can further reduce the influence of the electromagnetic wave on the printed circuit board 2 and enable miniaturization. Additionally, as shown in Fig. As illustrated in Figure 3, the seal M15 is arranged to seal a gap between the housing 7 and the motor M1 around the through-hole 73 of the housing 7 of the power conversion device 1. In this case, by providing the Fig. Figure 6 illustrates that the stiffness and mechanical strength of a section of the bottom wall section 71 of the housing 7, which is pressed against the seal M15, is improved by the auxiliary shielding section 74. Therefore, it is possible to improve the water resistance and reliability of the power conversion device 1 by exerting a sufficient compressive force through the bottom wall section 71 on the seal M15, while preventing deformation of the bottom wall section 71 of the housing 7.

[0055] Fig. Figure 7 is an enlarged cross-sectional view illustrating a third modification of section P, which is shown in Fig. 4 is surrounded by a dotted line.

[0056] In the power conversion device 1 of the present modification, the distal end of the shielding section 5 is in contact with a location around the through-hole 73 of the housing 7. It is stated that the distal end of the shielding section 5 can be in contact with a location around the through-hole 73 of the housing 7 via a conductive adhesive.

[0057] According to the in Fig. In the third modification of the power conversion device 1 illustrated in Figure 7, the gap between the distal end of the shielding section 5 and the inner bottom surface 75 of the housing 7 can be eliminated, allowing the electromagnetic wave emitted by the busbar 4 towards the outside of the shielding section 5 to be more reliably shielded by the shielding section 5. Therefore, according to the present modification, it is possible to create the power conversion device 1, which can further reduce the influence of the electromagnetic wave on the printed circuit board 2 and enable miniaturization.

[0058] Fig. Figure 8 is an enlarged cross-sectional view illustrating a fourth modification of section P, which is shown in Fig. 4 is surrounded by a dotted line.

[0059] In the power conversion device 1 of the present modification, the shielding section 5 has a tube shape around the entire circumference of the through-hole 73 of the housing 7 instead of the base unit 6. With such a configuration, effects similar to those of the in Fig. The result is achieved in the embodiment illustrated in Figure 4. The tubular shielding section 5 has a tapered proximal end section that is connected to the inner bottom surface 75 of the housing 7, its opening area decreasing as it approaches the base unit 6. In the tubular shielding section 5, the distal end section, which is opposite the proximal end section, has substantially the same opening area in the thickness direction Dt of the printed circuit board 2.

[0060] Furthermore, in the power conversion device 1 of the present modification, the distal end section of the shielding section 5 is inserted into the through-hole 61 of the base unit 6. In this configuration, the electromagnetic wave emitted by the busbar 4 between the base unit 6 and the inner bottom surface 75 of the housing 7 can be shielded more reliably by the shielding section 5.

[0061] Therefore, according to the present modification, it is possible to create the power conversion device 1, which can further reduce the influence of the electromagnetic wave on the circuit board 2 and enable miniaturization.

[0062] Fig. 9 is an enlarged cross-sectional view of a fifth modification of the in Fig. 4 illustrated power conversion device 1. Fig. 10 is a perspective view of a state in which the housing 7 of the in Fig. 9 illustrated power conversion device 1 turned over and the bottom wall section 71 removed. Fig. 11 is an enlarged view of Section XI, which is in Fig. 10 is surrounded by a dashed line. The power conversion device 1 of the present modification includes a signal line 23 which is connected to the circuit board 2. The signal line 23 is connected, for example, to the sensor 33, the busbar 4, and the like. The signal line 23 is held between the shielding section 5 and the housing 7.

[0063] According to the Fig. In the power conversion device 1 of the fifth modification, illustrated in Figures 9 to 11, a space for guiding the signal line 23 is formed between the shielding section 5 and the housing 7, whereby the signal line 23 can be held between the shielding section 5 and the housing 7. As a result, the signal line 23 can be protected from the electromagnetic wave by the shielding section 5 and the housing 7, and superimposed noise for the signal line 23 can be suppressed.

[0064] Fig. Figure 12 is a cross-sectional view showing a modification of the power conversion device 1 and the motor M according to Fig. Figure 3 illustrates this. In the present modification, the busbar 4 has a first section, which is connected to the power conversion module 3 via the sensor 33, and a second section, which is integrally provided with the terminal M3 of the motor M. Additionally, the housing 7 has an opening 76 for connecting the first and second sections of the busbar 4. After the first and second sections of the busbar 4 are connected, the opening 76 is closed by a cover (not illustrated). Furthermore, in the present modification, similar effects to those of the power conversion device 1 and the motor M of the [reference to be added] can be achieved. Fig. 3 illustrated embodiments can be achieved.

[0065] Although the embodiments of the power conversion device and the motor have been described in detail with respect to the drawings in accordance with the present disclosure, the specific configuration is not limited to the embodiments, and the present disclosure includes design changes and the like, without deviating from the main point of the present disclosure. List of reference symbols 1 Power conversion device 2 circuit boards 21 side margin 23 Signal line 3 Performance Implementation Module 4 busbar 5 Shielding section 6 basic units 61 Through hole 7 cases 73 Through hole 74 Auxiliary shielding section Dt Thickness direction M Motor M1 housing M3 connector S1 one side S2 opposite side

Claims

[1] Power conversion device (1) comprising: a printed circuit board (2); a power conversion module (3) arranged so that it faces the printed circuit board (2); a busbar (4) connected to the power conversion module (3); and a shielding section (5) that shields against electromagnetic waves, wherein the busbar (4) extends from one side along a thickness direction of the printed circuit board (2) through a side edge (21) of the printed circuit board (2) to an opposite side of the printed circuit board (2) and wherein the shielding section (5) is arranged between the busbar (4) and the side edge (21) of the printed circuit board (2), extends from one side along the thickness direction of the printed circuit board (2) to the opposite side and extends along the side edge (21) of the printed circuit board (2) to both sides of the busbar (4). [2] Power conversion device (1) according to claim 1, further comprising: a base unit (6) which is arranged between the printed circuit board (2) and the power conversion module (3), and a housing (7) that supports the base unit (6) and the circuit board (2), wherein both the base unit (6) and the housing (7) have a through-hole (61, 73) through which the busbar (4) passes. [3] Power conversion device (1) according to claim 2, wherein the shielding section (5) has a tube shape around the entire circumference of the through-hole (61) of the base unit (6). [4] Power conversion device (1) according to claim 3, which further comprises an auxiliary shielding section (74) having a tube shape around the through hole (73) of the housing (7) and extending in the direction of the base unit (6). [5] Power conversion device (1) according to claim 4, wherein a distal end of the shielding section (5) is arranged within the auxiliary shielding section (74). [6] Power conversion device (1) according to claim 4, wherein the auxiliary shielding section (74) is arranged within a distal end section of the shielding section (5). [7] Power conversion device (1) according to claim 3, wherein a distal end of the shielding section (5) is in contact with a location around the through-hole (73) of the housing (7). [8] Power conversion device (1) according to claim 2, wherein the shielding section (5) has a tube shape around the entire circumference of the through-hole (73) of the housing (7). [9] Power conversion device (1) according to claim 8, wherein a distal end section of the shielding section (5) is inserted into the through-hole (61) of the base unit (6). [10] Power conversion device (1) according to one of claims 3 to 9, which further comprises a signal line (23) connected to the circuit board (2), wherein the signal line (23) is held between the shielding section (5) and the housing (7). [11] Motor (M) comprising: a housing (M1) to which the power conversion device (1) according to one of claims 1 to 10 is attached; and a connection (M3) which is connected to the busbar (4).

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