JP2022130231A - Inverter device, motor module and vehicle - Google Patents

Abstract

To provide an inverter device having a simple structure and excellent assembling workability while shielding a power module.SOLUTION: An inverter device 20 includes: a power module 100 which has one or more switching elements for converting DC to AC; a drive circuit board 200 which is arranged so as to overlap the power module and drives the switching elements; a control circuit board 400 which is arranged to overlap the drive circuit board, is electrically connected to the drive circuit board, and controls on/off of the switching element; a shield plate 300 which is arranged between the drive circuit board and the control circuit board so as to cover the drive circuit board and shields electromagnetic noise generated from the drive circuit board. The power module has at least two first positioning pins 110, 120 protruding vertically to the drive circuit board and the shielding plate. The drive circuit board and the shielding plate each have at least two through holes 206, 208, 306, 308 respectively engaging with each first positioning pin.SELECTED DRAWING: Figure 3

Description

The present invention relates to an inverter device, a motor module including the inverter device, and a vehicle including the motor module.

2. Description of the Related Art Inverter devices are used in vehicles using a motor as a power source, such as hybrid vehicles (HEV), plug-in hybrid vehicles (PHV), and electric vehicles (EV).
The inverter device includes a power module in which a plurality of switching elements (for example, IGBTs) are modularized. By turning on/off the switching elements according to a control signal from a control circuit board, the direct current from the battery mounted on the vehicle is supplied. The electric power is converted into AC power for driving the motor and output.
In such an inverter device, electromagnetic noise is generated by the switching operation of the switching elements of the power module. Therefore, in order to solve this problem, a configuration has been proposed in which a conductive shield plate is provided between the control circuit board and the power module to shield electromagnetic noise generated in the power module (for example, Patent Document 1: ).

Japanese Patent Application Laid-Open No. 2001-250910

In the inverter device of Patent Document 1, a shield plate is provided between the switching element of the power module and the control circuit board, and the switching element and the control circuit board are arranged in separate spaces, thereby reducing electromagnetic wave noise generated in the power module. It is configured so that it does not fly to the control circuit board.
However, in the configuration of Patent Document 1, since the switching elements and the control circuit board are arranged in separate spaces, there is a problem that a space for assembly work is required in each space, resulting in an increase in the size of the device.
In addition, since the switching element and the control circuit board must be electrically connected, the structure becomes complicated and the assembly workability is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inverter device that shields a power module, has a simple structure, and is easy to assemble. Another object of the present invention is to provide a motor module including such an inverter device and a vehicle including such a motor module.

One aspect of the inverter device of the present invention includes a power module having at least one switching element for converting direct current to alternating current, a drive circuit board arranged so as to overlap the power module and driving the switching element, and a drive circuit. A control circuit board which is arranged to overlap the substrate, is electrically connected to the drive circuit board, and controls ON/OFF of the switching element, and is arranged between the drive circuit board and the control circuit board so as to cover the drive circuit board. and a shielding plate for shielding electromagnetic noise generated from the drive circuit board, the power module having at least two first positioning pins protruding vertically toward the drive circuit board and the shielding plate, and the drive circuit The substrate and the shielding plate each have at least two through-holes respectively engaged with the respective first locating pins.

Moreover, one aspect of the motor module of the present invention is characterized by comprising the above inverter device.
Moreover, one aspect of the vehicle of the present invention is characterized by including the above motor module.

According to the present invention, an inverter device having a simple structure and good assembling workability is realized while shielding a power module. Also, a motor module provided with such an inverter device and a vehicle provided with such a motor module are realized.

FIG. 1 is a perspective view showing a motor module on which an inverter device according to an embodiment of the invention is mounted. FIG. 2 is a perspective view showing the configuration of the inverter device according to the embodiment of the invention. 3 is an exploded perspective view of the inverter device of FIG. 2. FIG. FIG. 4 is a cross-sectional view of the inverter device 20 of FIG. 2 taken along line AA.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

FIG. 1 is a perspective view showing a motor module on which an inverter device according to an embodiment of the invention is mounted. 2 to 4 are diagrams showing the configuration of the inverter device according to the embodiment of the present invention.
In the following description, the gravitational direction is defined based on the positional relationship when the motor module is mounted on a vehicle positioned on a horizontal road surface. Also, in FIGS. 1 to 4, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction indicates the vertical direction (that is, the vertical direction), the +Z direction is the upper side (the side opposite to the direction of gravity), and the −Z direction is the lower side (the direction of gravity). Also, the X-axis direction is a direction perpendicular to the Z-axis direction and indicates the front-rear direction of the vehicle on which the motor module is mounted. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (horizontal direction) of the vehicle.
In addition, in this specification, “extending (provided)” in a predetermined direction (or plane) means extending in a strictly predetermined direction, and in addition to the case of extending at an angle of less than 45° with respect to the strict direction. It also includes the case where it extends in an inclined direction within the range.

As shown in FIG. 1, a motor module 1 is installed in a vehicle that uses a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), etc., and is used as the power source. be. That is, the motor module 1 is a driving device.
As shown in FIG. 1 , motor module 1 includes motor 10 , inverter device 20 , housing 30 , and inverter cover 40 . The motor module 1 also includes a reduction gear, a differential gear, an oil pump (none of which are shown), and the like.

As shown in FIG. 1, the motor 10 is housed in a motor housing (not shown) formed within the housing 30 . The motor 10 includes a rotor (not shown) rotating around a horizontally extending motor shaft (shaft) J2, and a stator (not shown) located radially outside the rotor.
The rotor rotates around a motor shaft J2 that extends horizontally and in the width direction of the vehicle when alternating current is supplied to the stator from a battery (not shown) via the inverter device 20 . In addition, in this embodiment, the motor shaft J2 is parallel to the Y direction.

The inverter device 20 is a device that converts DC power from a battery (not shown) mounted on the vehicle into AC power for driving the motor 10 . The inverter device 20 is electrically connected to the battery and the motor 10 and, like the motor 10, is accommodated in an inverter accommodating portion (not shown) formed inside the housing 30. As shown in FIG. The inverter device 20 housed in the inverter housing is covered with an inverter cover 40 attached to the housing 30 .

FIG. 2 is a perspective view showing the configuration of the inverter device 20 according to the embodiment of the invention. 3 is an exploded perspective view of the inverter device 20 of FIG. 2. FIG. FIG. 4 is a cross-sectional view of the inverter device 20 of FIG. 2 taken along line AA.

As shown in FIGS. 2 to 4, the inverter device 20 of this embodiment includes a power module 100, a drive board 200 (drive circuit board), a shield plate 300, a control board 400 (control circuit board), and a case 500. The inverter device 20 is configured by stacking a power module 100, a drive board 200, a shield plate 300, and a control board 400 on a case 500 in order in the Z direction. 2 to 4, some components (for example, case 500, bolts, etc.) are omitted as appropriate for the sake of clarity.

The power module 100 is a switching element that controls power supplied to the motor 10, and has at least one IGBT (Insulated Gate Bipolar Transistor (not shown)) inside. The power module 100 of this embodiment includes a rectangular plate-shaped main body 101, a plurality of (e.g., eight) through-holes 102 formed along the edge of the main body 101, and from the main body 101 in the +Z direction. It has a plurality of (e.g., eight) cylindrically projecting bosses 104 and positioning pins 110 and 120 (first positioning pins) cylindrically projecting from the main body 101 in the +Z direction.

The drive board 200 is arranged so as to overlap the power module 100, is electrically connected to the power module 100 and the control board 400, and drives the switching element (IGBT) of the power module 100 based on a signal from the control board 400. electronic circuit. The drive board 200 has a rectangular plate-shaped circuit board 201, three tall components 210, 220, and 230 protruding in the +Z direction (that is, tall), and a connector 250 (first connector). In this embodiment, the tall components 210, 220, and 230 are sources of electromagnetic noise, such as transformers. The circuit board 201 also has through holes 206 and 208 with which the positioning pins 110 and 120 of the power module 100 are engaged.

The shielding plate 300 is arranged between the drive board 200 and the control board 400 so as to cover the drive board 200, and shields electromagnetic waves generated by the drive board 200. The shielding plate 300 is made of a rectangular metal plate (for example, SECC (electrogalvanized It is a member made of steel plate)). The shielding plate 300 has through holes 302 formed at the four corners for fixing the shielding plate 300 to the case 500, and a plurality of (for example, six) bosses 304 (boss member), positioning pins 310 and 320 (second positioning pins) that cylindrically protrude from the shielding plate 300 in the +Z direction, and tall parts 210, 220, and 230, and protrude in the +Z direction. (Recessed) drawn portions 330 and 340, through holes 306 and 308 that engage with the positioning pins 110 and 120 of the power module 100, and a U-shaped notch provided to expose the connector 250 of the drive board 200 a portion 350;

The control board 400 is electrically connected to the drive board 200 and a vehicle control device (not shown), and according to a signal from the vehicle control device, the drive board 200 receives a control signal (a signal for controlling on/off of the switching element (IGBT)). ) is an electronic circuit that transmits The control board 400 includes a rectangular circuit board 401 , six through holes 402 formed at positions corresponding to the bosses 304 , and through holes 406 and 408 that engage with the positioning pins 310 and 320 of the shielding plate 300 . and a plurality of mounting components (not shown). A connector 450 (second connector) that fits with the connector 250 of the drive board 200 is arranged on the back surface of the control board 400 (the surface facing the shielding plate 300) (FIG. 4). The connectors 250 and 450 are so-called BtoB (Board to Board) connectors.

The case 500 is, for example, a square-shaped metal (eg, aluminum die-cast) member that accommodates the power module 100 , the drive board 200 , the shielding plate 300 , and the control board 400 . As will be described later, power module 100 is attached to the bottom surface of case 500, and drive board 200, shielding plate 300, and control board 400 are attached in this order thereon. A projecting portion 510 for fixing the shielding plate 300 is formed in the case 500 (FIG. 4). Incidentally, the case 500 is fixed inside an inverter accommodating portion formed inside the housing 30 of the motor module 1 .

(Assembly process of inverter device 20)
Next, the assembly process of the inverter device 20 will be described with reference to FIGS. 3 and 4. FIG. When assembling the inverter device 20 , first, the power module 100 is arranged at a predetermined position on the bottom surface of the case 500 , and bolts (not shown) are inserted through the through holes 102 to screw holes (not shown) formed in the bottom surface of the case 500 . (shown) to fix the power module 100 in the case 500 (FIG. 4).

Next, the drive board 200 is attached on the power module 100 . The boss 104 of the power module 100 is a member that supports the drive board 200 in the Z direction. When the drive board 200 is mounted on the power module 100, the tip surface of the boss 104 contacts the back surface of the drive board 200 (the surface facing the power module 100). That is, the boss 104 restricts the movement of the drive board 200 in the Z direction and positions it.
Further, when the drive board 200 is mounted on the power module 100, the positioning pins 110 are inserted through the through holes 206 of the drive board 200, and the positioning pins 120 are inserted through the through holes 208 of the drive board 200. there is Therefore, when the drive board 200 is mounted on the power module 100 , the drive board 200 is restricted from moving in the X and Y directions by the positioning pins 110 and 120 and positioned relative to the power module 100 . be.

Next, the shielding plate 300 is attached on the drive substrate 200 . Positioning pins 110 and 120 extending from power module 100 extend upward (+Z direction) through through holes 206 and 208 of drive board 200, and when shield plate 300 is mounted on drive board 200, the positioning pins 110 is inserted through the through hole 306 of the shielding plate 300 , and the positioning pin 120 is inserted through the through hole 308 of the shielding plate 300 . Therefore, when the shield plate 300 is mounted on the drive board 200 , the movement of the shield plate 300 in the X direction and the Y direction is restricted by the positioning pins 110 and 120 , so that the shield plate 300 is placed relative to the power module 100 and the drive board 200 . position.
Also, when the shielding plate 300 is mounted on the drive board 200, the through holes 302 of the shielding plate 300 are positioned above the projecting portion 510 of the case 500, and bolts (not shown) are inserted into the through holes 302. The shielding plate 300 is fixed to the projecting portion 510 by being inserted and screwed into a screw hole (not shown) formed in the projecting portion 510 . By fixing the shielding plate 300 to the projecting portion 510, movement of the shielding plate 300 in the Z direction is also restricted and positioned.

As shown in FIG. 4, when the shielding plate 300 is mounted on the drive board 200, the upper end of the tall component 210 of the drive board 200 fits within the narrowed portion 330 of the shielding plate 300, and the tall components 220, 230 The upper end of the is accommodated within the narrowed portion 340 of the shielding plate 300 . As described above, in the present embodiment, the tall components 210, 220, and 230, which are sources of electromagnetic noise, are accommodated in the narrowed portions 330 and 340 of the shielding plate 300, and the drive substrate 200 and the shielding plate 300 are close to each other. placed. Therefore, electromagnetic noise generated in the drive board 200 is preferably reflected (that is, shielded) by the shielding plate 300 .
Since the shielding plate 300 is fixed to the housing 30 of the motor module 1 via the case 500, the shielding plate 300 is electrically connected to the body ground of the vehicle.

Next, the control board 400 is attached on the shielding plate 300 . When the control board 400 is mounted on the shielding plate 300 , the positioning pins 310 of the shielding plate 300 are inserted through the through holes 406 of the control board 400 and the positioning pins 320 are inserted through the through holes 408 of the control board 400 . It's becoming Therefore, when the control board 400 is mounted on the shielding plate 300, the control board 400 is restricted from moving in the X and Y directions by the positioning pins 310 and 320, and is positioned relative to the shielding plate 300. be.
The boss 304 of the shielding plate 300 is a member that supports the control board 400 in the Z direction and regulates the distance between the shielding plate 300 and the control board 400 . When the control board 400 is mounted on the shielding plate 300, the tip surface of the boss 304 is in contact with the back surface of the control board 400 (the surface facing the shielding plate 300), and each through hole 402 is formed in each boss 304. It is designed to be positioned in a screw hole. The control board 400 is fixed on the shielding plate 300 by inserting a bolt (not shown) through each through hole 402 and screwing it into the screw hole of each boss 304 . In other words, the boss 304 positions the control board 400 while restricting its movement in the Z direction.
4, when the control board 400 is mounted on the shielding plate 300, the connector 450 arranged on the back surface of the control board 400 (the surface facing the shielding plate 300) is inserted into the notch of the shielding plate 300. It passes through the portion 350 and is fitted with the connector 250 of the drive board 200 to electrically connect the control board 400 and the drive board 200 .

As described above, the inverter device 20 of the present embodiment is assembled by stacking the power module 100, the drive board 200, the shield plate 300, and the control board 400 on the case 500 in order in the Z direction. In this assembly process, the drive board 200 and the shielding plate 300 are positioned by positioning pins 110 and 120 formed on the power module 100, and the control board 400 is positioned by positioning pins 310 and 320 formed on the shielding plate 300. Therefore, the assembly work becomes extremely easy.
Further, according to the configuration of this embodiment, the positional relationship between the drive board 200 and the control board 400 is accurately determined, so that the connector 250 and the connector 450 can be easily fitted. No external stress is applied.
Further, according to the configuration of this embodiment, the positional relationship between the drive substrate 200 and the shielding plate 300 is accurately determined, so that the shielding plate 300 can be arranged close to the drive substrate 200. It is possible to suppress the radiation (propagation) of electromagnetic noise generated in the

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the above-described embodiments, and various modifications are possible within the technical scope of the present invention.

For example, the inverter device 20 of the present embodiment has been described as having the power module 100, the drive board 200, the shield plate 300, and the control board 400 mounted on the case 500, but it is not limited to such a configuration. do not have. For example, instead of the case 500 , the power module 100 , the drive board 200 , the shielding plate 300 and the control board 400 can be directly attached to the inverter housing portion inside the housing 30 of the motor module 1 .

It should be noted that the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning of equivalents of the scope of the claims.

Reference Signs List 1: motor module 10 : motor 20 : inverter device 30 : housing 40 : inverter cover 100 : power module 101 : main body 102 : through hole 104 : boss 110 : positioning pin 120 : positioning pin 200 : drive board 201 : circuit board 206 : Through hole 208 : Through hole 210 : Tall part 220 : Tall part 230 : Tall part 250 : Connector 300 : Shield plate 302 : Through hole 304 : Boss 306 : Through hole 308 : Through hole 310 : Positioning pin 320 : Positioning pin 330 : Squeezed portion 340 : Squeezed portion 350 : Notch 400 : Control board 401 : Circuit board 402 : Through hole 406 : Through hole 408 : Through hole 450 : Connector 500 : Case 510 : Protruding portion J2 : Motor shaft

Claims (9)

a power module having at least one switching element for converting direct current to alternating current;
a drive circuit board arranged to overlap the power module and driving the switching element;
a control circuit board disposed so as to overlap the drive circuit board, electrically connected to the drive circuit board, and controlling on/off of the switching element;
a shielding plate disposed between the drive circuit board and the control circuit board so as to cover the drive circuit board and shielding electromagnetic noise generated from the drive circuit board;
with
The power module has at least two first positioning pins protruding vertically toward the drive circuit board and the shield plate,
The inverter device, wherein the drive circuit board and the shielding plate each have at least two through holes that engage with the respective first positioning pins. The drive circuit board has a tall component on the surface facing the shield plate,
2. The inverter device according to claim 1, wherein the shielding plate has a narrowed portion projecting toward the control circuit board so as to cover the tall component. 3. The inverter device according to claim 2, wherein said tall component is a transformer. the shielding plate has at least two second positioning pins protruding vertically toward the control circuit board;
4. The inverter device according to any one of claims 1 to 3, wherein the control circuit board has at least two through holes that engage with the respective second positioning pins. further comprising a metal case housing the power module, the drive circuit board, the control circuit board, and the shield plate;
The inverter device according to any one of claims 1 to 4, wherein the shield plate is fixed to the case. further comprising a boss member arranged between the shielding plate and the control circuit board for regulating the distance between the shielding plate and the control circuit board;
The inverter device according to any one of claims 1 to 5, wherein the control circuit board is fixed to the shielding plate via the boss member. The drive circuit board has a first connector projecting toward the control circuit board,
The inverter device according to any one of claims 1 to 6, wherein the control circuit board has a second connector that protrudes toward the drive circuit board and is fitted with the first connector. . A motor module comprising the inverter device according to claim 1 . A vehicle comprising the motor module according to claim 8 .

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