JP6665010B2 - Power converter - Google Patents

Description

  The present invention relates to a power converter that is arranged between a battery and a motor to control power stored in the battery and supply the power to the motor.

  Various types of power converters for driving a motor are known (for example, see Patent Document 1 (FIGS. 1 and 2)).

  As shown in FIG. 1 of Patent Literature 1, the power converter includes a switching element power module (hereinafter abbreviated as a power module) (Ug, Um) (letters and numerals in parentheses are described in Patent Literature 1). The same applies to the following.) A bracket (23) supporting the smoothing capacitor (C), a bracket (24) supporting the control board (Uc), and a cover (27). A bracket (23) is mounted on the case frame (20), a bracket (24) is mounted on the bracket (23), and the bracket (24) is covered with a cover (27).

  As shown in FIG. 2 of Patent Document 1, the smoothing capacitor (C) includes two harnesses, one harness is connected to a circuit extending from the positive electrode of the battery power supply (B), and the other harness is connected to the battery power supply (B). ) Is connected to a circuit extending from the negative electrode.

  Depending on the arrangement position of the smoothing capacitor (C), the two harnesses may be wired in parallel and relatively close. Since the harness is flexible, the harness sways under the vibration of the vehicle. Therefore, if the harness and the case frame (20) or the bracket (23/24) or the two harnesses are close to each other, they may come into contact with each other, rub each other, the coating becomes thin, and the insulation property may be reduced. . In addition, since the harness is rich in flexibility, it is sandwiched between the bracket (23) and the bracket (24) or between the bracket (23/24) and the case frame (20) during assembly, and in the worst case, the harness is disconnected. There is a possibility that it will end up.

The power conversion device incorporates components having a plurality of harnesses in addition to the capacitor (C). However, similarly, these components may be deteriorated in insulation or may be pinched.
In the power converter, it is required to prevent the insulation of the harness from lowering and prevent the harness from being pinched during assembly.

JP-A-2003-199363

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a power conversion device that can prevent a harness from being pinched during assembly and prevent a decrease in insulation.

The invention according to claim 1 is a power conversion device that is disposed between a battery and a motor and controls the power stored in the battery to drive the motor.
A power module case that houses a power module that switches the motor, a board bracket on which a circuit board that controls the power module is mounted, and a component that constitutes the power conversion device,
The power module case has a fitting groove into which at least one of a plurality of harnesses extending from the component is fitted, and the fitting groove is provided on an outer peripheral edge of the power module case. Features.

  In the invention according to claim 2, the board bracket is stacked on the power module case, and the harness holding portion is provided on a surface opposite to the mounting surface of the circuit board and at a portion corresponding to the fitting groove. Features.

  The invention according to claim 3 is characterized in that the substrate bracket is provided with a through hole at a portion corresponding to the fitting groove.

In the invention according to the first aspect, the harness can be restricted from moving in the horizontal direction by fitting the harness into the fitting groove provided in the power module case. Therefore, it is possible to prevent the covering between the harnesses, the covering between the bracket and the harness, or the covering between the lower case and the harness from colliding with and rubbing due to vibration or the like, thereby suppressing a decrease in insulation.
In addition, since there is no arrangement in which the harness is sandwiched at the time of assembling, assemblability can be improved.

Furthermore, it is only necessary to provide a fitting groove on the outer peripheral edge of the power module case, and the harness can be fixed without increasing the size of the power module case.
Therefore, according to the present invention, there is provided a power converter having a structure capable of preventing a harness extending from a component part from being pinched during assembly and preventing contact between the harnesses during use.

  In the invention according to claim 2, by arranging the board bracket on the power module case, the harness holding portion on the board bracket side closes the upper opening of the fitting groove on the power module case side. As a result, it is possible to prevent the harness pressing portion from moving the harness above the fitting groove, and to prevent the harness from coming off the fitting groove.

  In the invention according to claim 3, a through hole is provided in the board bracket, and the fitting groove can be seen through the through hole. That is, by visually observing from the through hole, it is possible to confirm whether or not the harness is fitted in the fitting groove and, if so, the state of the fitting.

It is an exploded perspective view of the power converter concerning the present invention. It is a figure explaining the shape of 2a part of FIG. It is a figure explaining the attachment procedure of a harness and a board bracket. It is a figure explaining an operation of a penetration hole and a harness control part.

  An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. In the coordinate directions XYZ in the drawing, the X-axis direction is defined as the left-right direction, the Y-axis direction is defined as the front-back direction, and the Z-axis direction is defined as the up-down direction.

  The power converter 10 according to the present invention is disposed between a battery and a motor. Since the battery and the motor are well known, they are not shown. When the motor is used as a generator, the generated power is stored in a battery. Therefore, the power converter 10 of the present invention can be arranged between the battery and the motor or between the generator and the battery.

  As shown in FIG. 1, the power conversion device 10 includes, for example, a lower case 11 made of metal such as aluminum die-cast, a rectangular power module case 13 made of resin, and fixed to the lower case 11 with bolts 12. A component 15 that is fixed to the lower case 11 with bolts 14 at a portion that does not interfere with the module case 13 and a resin, which is fixed to the lower case 11 with bolts 16 so as to cover the power module case 13, It comprises a rectangular board bracket 17 on which the boards 25 and 26 are placed, and an upper case 19 made of metal such as aluminum die-cast and fastened to the lower case 11 with bolts 18 so as to cover the board bracket 17.

The power module case 13 houses a power module (not shown) for switching power supply to a motor or power generation from a generator. A circuit board 21 for controlling the power module is mounted on the upper part of the power module case 13.
The component 15 is an electric / electronic component included in the power converter 10, and is, for example, a capacitor 24 including two harnesses 22 and 23. One is referred to as a positive harness 22 and the other is referred to as a negative harness 23.
The board bracket 17 supports circuit boards 25 and 26 for controlling a power module, a motor, and the like on a flat surface.

  As shown in FIG. 2A, the power module case 13 has a fitting groove 28 on the outer peripheral edge 27. The fitting groove 28 is a groove having a width and a depth corresponding to the outer diameter of one (negative electrode side harness 23) of two harnesses (reference numerals 22, 23 in FIG. 1). The upper surface of the fitting groove 28 is open.

  The formation portion of the fitting groove 28 can be set at any position as long as it is the outer peripheral edge portion 27, but is preferably provided at the corner portion 29 of the power module case 13. With the corner 29, the fitting groove 28 can be formed linearly at an angle of 45 ° with respect to one side of the power module case 13. However, the fitting groove 28 may be an arc groove in plan view.

  Furthermore, when the bolt introduction hole 31 is provided in the corner portion 29 and the bolt hole 34 is provided at the bottom of the bolt introduction hole 31, the fitting groove 28 is located outside the bolt introduction hole 31 and approaches the bolt introduction hole 31. It is good to provide. When the bolt introduction hole 31 is formed by a mold, the fitting groove 28 can be formed by a slight mold correction.

  In the board bracket 17, a through-hole 32 penetrating vertically (in the Z-axis direction) is formed in a portion corresponding to the fitting groove 28 in the plane portion 17a on which the circuit boards 25 and 26 (see FIG. 1) are placed. Provide. A first peripheral wall 35 is formed in the through hole 32 and extends from the rear surface of the flat portion 17a toward the power module case 13 (Z-axis direction). Preferably, a second through hole 33 is also provided at a position corresponding to the bolt introduction hole 31 on the power module case 13 side. In the through hole 33, a second peripheral wall 36 extending from the back surface of the flat portion 17a toward the power module case 13 (Z-axis direction) is formed. In this example, the through hole 32 and the second through hole 33 are connected in a gourd shape, but may be separated.

  As shown in FIG. 2B, the second peripheral wall 36 forming the second through hole 33 is extended downward (in the Z-axis direction) by several millimeters with respect to the first peripheral wall 35 forming the through hole 32. . The lower end surface of the first peripheral wall 35 serves as a harness holding portion 37. As shown by the imaginary line, the second peripheral wall 36 is fitted in the bolt introduction hole 31 when the harness presser 37 is placed on the power module case 13. That is, by fitting the lower end of the second peripheral wall 36 to the upper part of the bolt introduction hole 31, the board bracket 17 can be accurately positioned with respect to the power module case 13. The need for a dowel pin for positioning is eliminated.

  As shown in FIG. 3, the lower case 11 is provided with a positive electrode side bus bar 38 and a negative electrode side bus bar 39 in advance. The component 15 is fixed to such a lower case 11 with bolts 14, 14. The negative-electrode-side harness 23 extending from the component 15 is fixed to a predetermined position of the negative-electrode-side bus bar 39 with a screw 41 while being fitted into the fitting groove 28. The positive-electrode-side harness 22 extending from the component 15 extends so as to bypass the power module case 13 and is fixed to a predetermined position of the positive-electrode-side bus bar 38 with a screw 42.

  Next, the board bracket 17 is placed on the lower case 11 so as to cover the power module case 13 and fixed with the bolts 16.

As shown in FIG. 4A, it can be visually confirmed through the through hole 32 that the negative electrode side harness 23 is routed at a predetermined position (fitting groove 28). Therefore, there is no possibility that the harness 23 is pinched by the board bracket 17 during assembly.
As shown in FIG. 4B, since the negative harness 23 fitted in the fitting groove 28 is pressed from above by the harness holding portion 37, there is a possibility that the negative harness 23 may come off from the fitting groove 28 even if the vehicle is subjected to vibration or the like. There is no.

Further, through the second through-hole 33, it can be visually confirmed that the bolt 12 is attached.
At the time of assembling, the assembling state of the negative electrode side harness 23 can be easily checked, so that the assemblability can be improved.

  As a result, the two harnesses 22 and 23 described with reference to FIG. 1 are mechanically separated by the fitting groove 28, and there is no danger of contacting each other. In addition, since the lower case 11 is die-cast with aluminum, the bolt mounting surface and the like are subjected to surface processing, and there is a possibility that the coating may be damaged when the harness comes into contact. However, since the harness is fixed by the fitting groove 28 and the harness holding portion 37, the harness does not come into contact with the board bracket 17 or the lower case 11. Therefore, there is no possibility that the coating is peeled off, and the electric insulation performance is maintained satisfactorily.

  In the embodiment, one fitting groove 28 is provided for the two harnesses 22 and 23, but two fitting grooves 28 may be provided for the two harnesses 22 and 23. . The number of the harnesses 22 and 23 may be three or more.

  The power conversion device 10 can be mounted on an electric vehicle or a so-called hybrid vehicle, and can also be used for ships or general industries.

  The present invention is suitable for a power conversion device mounted on a vehicle.

  10 power converter, 11 lower case, 13 power module case, 15 components, 17 board bracket, 21 circuit board, 22 harness (positive electrode) Harness (negative side harness), 25, 26 ... circuit board, 27 ... outer peripheral edge, 28 ... fitting groove, 32 ... through hole, 37 ... .Harness holding section.

Claims (3)

In a power conversion device that is arranged between a battery and a motor and controls the power stored in the battery to drive the motor,
A power module case housing a power module for switching the motor,
A board bracket for mounting a circuit board for controlling the power module,
Components constituting the power converter,
The power module case has a fitting groove into which at least one of a plurality of harnesses extending from the component is fitted.
The power conversion device, wherein the fitting groove is provided on an outer peripheral edge of the power module case.   The board bracket is stacked on the power module case, and a harness holding portion is provided on a surface opposite to a mounting surface of the circuit board and at a portion corresponding to the fitting groove. Item 7. The power converter according to Item 1.   The power conversion device according to claim 1, wherein the board bracket has a through hole provided at a portion corresponding to the fitting groove.

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