JP2015130751A - power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power converter which makes inductance of a high potential side conductor and a low potential side conductor be uniform to suppress heat evolution from a main circuit wiring.SOLUTION: A power converter comprises a rod-shaped conductor assembled body 30 including first to fourth rod-shaped conductors 31 to 34 for connecting a DC side terminal of a power module 1 and a terminal of a smoothing capacitor 2. The second rod-shaped conductor 32 is installed in tandem with an end of the first rod-shaped conductor 31. The third rod-shaped conductor 33 is installed in parallel with the second rod-shaped conductor 32 through an insulation sheet material 41. The fourth rod-shaped conductor 34 is installed in parallel with the first rod-shaped conductor through an insulation sheet material 42 and is arranged, with space, in tandem with the third rod-shaped conductor. The rod-shaped conductor assembled body 30 further includes: a first diagonal connection conductor 81 for connecting the end of the first rod-shaped conductor with the third rod-shaped conductor positioned diagonally across the end; and a second diagonal connection conductor 82 for connecting the second rod-shaped conductor's end opposite to the first rod-shaped conductor with the fourth rod-shaped conductor positioned diagonally across the end of the second rod-shaped conductor. Lengths of conductor wiring for connecting the power module with the smoothing capacitor on the high potential side and low potential side are made to be equal.

Description

  The present invention relates to a power converter that performs power conversion from AC power to DC power or from DC power to AC power, and more particularly to improvement of main circuit wiring on the DC power side.

  Conventionally, a power module unit that incorporates a switching element such as a transistor, a smoothing capacitor unit that is charged and discharged between the power module, and a current path between the power module unit and the smoothing capacitor unit that cross each other. A pair of bus bars in which currents in opposite directions flow at the same time, and wirings arranged around the bus bars and electrically connecting the control board A and the control board B. A technique is disclosed in which the high-potential side conductor and the low-potential side conductor are crossed to cancel the amplitude of the generated noise and reduce the noise generated from the bus bar.

JP 2008-43023 A (first page, FIGS. 1 to 5)

  In the conventional technology as described above, since the wiring length between the high potential side conductor and the low potential side conductor when the main circuit wiring is wired inside the power converter is not taken into consideration, the high potential side conductor Difference in wiring length between the low potential side conductor and the low potential side conductor causes an inductance imbalance. Inductance imbalance hinders the current flowing in the main circuit wiring and causes heat generation.

  The present invention has been made to solve the above-described problems, and it is possible to make the inductance of the high-potential side conductor and the low-potential side conductor uniform, and from the main circuit wiring in the power converter. It aims at providing the power converter device which suppressed exothermic heat.

A power conversion device according to the present invention includes a circuit unit that converts DC power into AC power, or converts AC power into DC power, and a power module that includes a DC high potential side terminal and a DC low potential side terminal;
A smoothing capacitor having a high potential terminal connected to the DC high potential side terminal and a low potential terminal connected to the DC low potential side terminal;
A first rod-shaped conductor connected to the DC high potential side terminal, a second rod-shaped conductor connected to the DC low potential side terminal, a third rod-shaped conductor connected to the high potential terminal, and the low potential A fourth rod-shaped conductor connected to the terminal, and the second rod-shaped conductor is arranged so as to be arranged in series with a gap at an end portion of the first rod-shaped conductor in the current flow direction, The third rod-shaped conductor is disposed in parallel and close to the second rod-shaped conductor via an insulating sheet material, and the fourth rod-shaped conductor is disposed via the insulating sheet material with respect to the first rod-shaped conductor. Are arranged in parallel with each other and arranged in series with the third rod-shaped conductor at intervals, and further, an end portion of the first rod-shaped conductor in the current flow direction and an oblique position thereof are arranged. A first oblique connection conductor for electrically connecting the third rod-shaped conductor; And a rod-shaped conductor assembly having a second diagonal connection conductor for electrically connecting an end portion of the second rod-shaped conductor facing the first rod-shaped conductor and the fourth rod-shaped conductor at an oblique position thereof. When,
The wiring lengths of the high potential side conductor and the low potential side conductor connecting the power module and the smoothing capacitor are equalized.

  The power conversion device according to the present invention is configured by using a rod-shaped conductor assembly having a rod-shaped structure as a main circuit wiring connecting the power module and the smoothing capacitor, so that both the high potential side conductor and the low potential side conductor have inductance. In addition, by having a twisted structure, the inductance of the high potential side conductor and the low potential side conductor can be made uniform, and heat generation from the main circuit wiring can be suppressed.

It is a perspective view which shows the power converter device by Embodiment 1 of this invention. It is an assembly perspective view which shows the structure of the rod-shaped conductor assembly shown by FIG. It is a perspective view which shows the structural example in the case of adding a some smoothing capacitor to the power converter device shown in FIG. It is a figure which shows the structure of the rod-shaped conductor assembly in the power converter device by Embodiment 2 of this invention, (a) is an assembly perspective view, (b) is a side view explaining the structure of a convex part. FIG. 5 is an assembly perspective view showing a positional relationship between the oblique connection conductor shown in FIG. 4 and an insulating member having a plurality of stepped surfaces formed in a step shape. It is a perspective view which shows the structural example in the case of adding a some smoothing capacitor to the power converter device by Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a perspective view showing a power converter according to Embodiment 1 of the present invention, FIG. 2 is an assembled perspective view showing the configuration of the rod-shaped conductor assembly shown in FIG. 1, and FIG. 3 is a power converter shown in FIG. It is a perspective view which shows the structural example in the case of adding a some smoothing capacitor to FIG. Here, a case where the power conversion device is a converter that converts three-phase AC power into DC power will be described. In the figure, the power conversion device has a built-in switching function that constitutes a converter that converts three-phase AC power into DC power, and outputs terminals 11, 12, and 13 for inputting each phase of the three-phase AC power, and outputs DC power. The brake terminal 16 for lowering the voltage when the terminal voltage exceeds the maximum rated value and the DC power output terminal on the high potential side that outputs DC power by inputting a control signal from a control circuit (not shown) A power module 1 provided with a DC high potential side terminal 14 and a DC low potential side terminal 15 which is a DC power output terminal on a low potential side; a smoothing capacitor 2 having a high potential terminal 21 and a low potential terminal 22; A rod-shaped conductor assembly 30 using a rod-shaped conductor to be described later for connecting the high potential side terminal 14 and the high potential terminal 21 and connecting the DC low potential side terminal 15 and the low potential terminal 22; It is provided.

  The high potential terminal 21 and the low potential terminal 22 of the smoothing capacitor 2 are arranged side by side on substantially the same plane, and the DC high potential side terminal 14 and the DC low potential side terminal 15 that are arranged side by side on the power module 1 as well. On the other hand, the arrangement of the high potential side and the low potential side is reversed. The rod-shaped conductor assembly 30 is bent in a crank shape with prismatic conductors 31, 32, 33, and 34, which are first, second, third, and fourth rod-shaped conductors made of a prismatic conductor here. Insulating sheet materials 41 and 42, the first diagonal connection conductor 81 bent in a crank shape that connects the prismatic conductors 31 and 33 in one diagonal position, and the other diagonal position Surrounding each of the sides of the central portion of the three sides of the second oblique connection conductor 82 bent in a crank shape connecting the prismatic conductors 32 and 34 and the first and second oblique connection conductors 81 and 82. It is comprised using the mountain-shaped plate-shaped insulation members 71 and 72 to do.

The DC high potential side terminal 14 is connected to the side surface of the prismatic conductor 31 via an L-shaped conductive connection member 62. The DC high potential side terminal 14 and the L-shaped conductive connection member 62 are bonded by a conductive screw 621, and the prismatic conductor 31 and the L-shaped conductive connection member 62 are connected by a conductive screw 622. . Therefore, the prismatic conductor 31 constitutes a part of the high potential side conductor of the main circuit wiring.
The DC low potential side terminal 15 is connected to the side surface of the prismatic conductor 32 via an L-shaped conductive connection member 61. The DC low potential side terminal 15 and the L-shaped conductive connecting member 61 are bonded by a conductive screw 611, and the prismatic conductor 32 and the L-shaped conductive connecting member 61 are connected by a conductive screw 612. . Therefore, the prismatic conductor 32 constitutes a part of the low potential side conductor of the main circuit wiring.

The prismatic conductor 31 is a conductor having the same shape as the prismatic conductor 34. The prismatic conductor 32 is a conductor having the same shape as the prismatic conductor 33. The end face in the longitudinal direction of the prismatic conductor 31 has the same shape as the end face in the longitudinal direction of the prismatic conductor 32. Further, the end face in the longitudinal direction of the prismatic conductor 33 has the same shape as the end face in the longitudinal direction of the prismatic conductor 34. In this example, the four prismatic conductors 31 to 34 have a square cross section, and have the same length and cross sectional dimensions. For example, the lengths of the prismatic conductors 31 and 34 and the lengths of the prismatic conductors 32 and 33 may be different from each other. The cross-sectional shape is not limited to a square.
The side surface of the prismatic conductor 32 that faces the side surface to which the L-shaped conductive connecting member 61 is attached is bonded to the side surface of the prismatic conductor 33 via an insulating sheet material 41 described later.
Similarly, the side surface of the prismatic conductor 31 facing the side surface to which the L-shaped conductive connection member 62 is attached is bonded to the side surface of the prismatic conductor 34 via an insulating sheet material 42 described later.

Next, the insulating sheet materials 41 and 42 formed in a crank shape will be described with reference to FIG. The insulating sheet material 41 covers one end (upper right side in the figure) of the crank-shaped side of the insulating sheet material 41 so as to cover the end surface facing the prismatic conductor 34 of the prismatic conductor 33, and the side of the central portion is prismatic. It is inserted between the side surfaces of the conductor 33 and the prismatic conductor 32 facing each other, and the other bent side is bonded so as to cover the end surface of the prismatic conductor 32 not facing the prismatic conductor 31. . As described above, the prismatic conductor 33 and the prismatic conductor 32 are arranged close to each other in a state of being insulated from each other.
Similarly, the insulating sheet material 42 covers the end surface of one of the three crank-shaped sides where one bent side does not face the prismatic conductor 33 of the prismatic conductor 34, and the side of the central portion is square. The columnar conductor 34 and the prismatic conductor 31 are inserted between the opposing side surfaces, and the other bent side is bonded so as to cover the end surface of the prismatic conductor 31 facing the prismatic conductor 32. The prismatic conductor 34 and the prismatic conductor 31 are adjacent to each other and connected in parallel while being insulated from each other.

Next, the blocks of the prismatic conductors 33 and 32 connected in parallel via the central side of the insulating sheet material 41 and the corners connected in parallel via the central side of the insulating sheet material 42. A method of electrically connecting the columnar conductors 34 and 31 to the block will be described.
Here, the insulating sheet material 41 of the prismatic conductor 33 is bonded from the side surface of the prismatic conductor 32 to which the L-shaped conductive connecting member 61 is attached on the facing surfaces where the two blocks face each other. Length to the side facing the surface (the side facing the surface to which the insulating sheet material 42 of the prismatic conductor 34 is bonded from the side of the prismatic conductor 31 to which the L-shaped conductive connecting member 62 is attached) L). Further, the length in the direction orthogonal to the length L on the opposing surfaces of the two blocks is 2M (shown in FIG. 1).

The first and second oblique connection conductors 81 and 82 formed in a crank shape shown in FIG. 2 are opposite to each other at both ends in the long side direction to the central conductive portion having a long side having a length L and a short side having a length M. Each of which has an end conductive portion formed of a bent piece bent at a right angle.
The mountain-shaped plate-like insulating members 71 and 72 are formed by bending a thin-leaf insulating material into a substantially T-shaped cross section, and sandwich the central conductive portion of the first oblique connection conductor 81 bent in a crank shape at the central portion. A groove portion that surrounds and insulates in this manner is formed, and skirt portions 71a and 72a that are symmetrically bent from side to side from the flange portion of the groove portion are formed. The depth of the groove is M, and the length is the same as the length L of the long side of the central conductive portion of the first and second oblique connection conductors 81 and 82.

One of the skirts 71a of the angle plate-like insulating member 71 is a corner to which the L-shaped conductive connecting member 62 of the block composed of the prismatic conductors 34 and 31 and the insulating sheet material 42 is connected. An L-shaped conductive connecting member 61 of a block composed of the prismatic conductors 33 and 32 and the insulating sheet material 41 is connected to the other end of the bottom portion 71a. The prismatic conductor 32 is placed on the upper surface of the figure perpendicular to the side surface.
The end conductive portion formed of one bent piece of the first oblique connection conductor 81 whose central conductive portion is insulated by the groove portion of the angle plate-shaped insulating member 71 is the L-shaped conductive connection member 62 of the prismatic conductor 31. Is connected to the side surface to which the other end of the prismatic conductor 33 is connected with a screw 812. As described above, the first diagonal connection conductor 81 conducts the prismatic conductor 31 and the prismatic conductor 33 at one diagonal position of the two blocks, and the prismatic conductor 32 at the other diagonal position. And the prismatic conductor 34 are insulated.

One of the skirt portions 72a of the angle plate-shaped insulating member 72 is a corner to which an L-shaped conductive connecting member 62 of a block composed of the prismatic conductors 31 and 34 and the insulating sheet material 42 is connected. The L-shaped conductive connecting member 61 of a block made up of the prismatic conductors 32 and 33 and the insulating sheet material 41 is in contact with the lower surface of the figure perpendicular to the side surface of the columnar conductor 31 and the other skirt 72a. It abuts on the lower surface of the figure perpendicular to the side surface of the connected prismatic conductor 32.
The end conductive portion formed of one bent piece of the second oblique connection conductor 82 whose central conductive portion is insulated by the groove portion of the angled plate-shaped insulating member 72 is the L-shaped conductive connection member 61 of the prismatic conductor 32. Is connected to the side surface to which the other end of the prism-shaped conductor 34 is connected with a screw 822. As described above, the second diagonal connection conductor 82 conducts the prismatic conductor 32 and the prismatic conductor 34 at one diagonal position of the two blocks, and the prismatic conductor 31 at the other diagonal position. And the prismatic conductor 33 are insulated.

As is clear from the above description, in this example, the central conductive portion of the first diagonal connection conductor 81 and the central conductive portion of the second diagonal connection conductor 82 are insulated by the angle plate-shaped insulating members 71 and 72, and the two Between the blocks, that is, between the prismatic conductor 31 and the prismatic conductor 32, and between the prismatic conductor 33 and the prismatic conductor 34, they are arranged side by side in the vertical direction in the figure in the same plane. When the first and second diagonal connection conductors 81 and 82 are within the height dimension of the prismatic conductor having a cross-sectional dimension of 2M, the central conductive portion of the first and second diagonal connection conductors 81 and 82 is used. Is required to be a dimension obtained by subtracting the thickness of the angle plate-like insulating members 71 and 72 from the dimension M.
The L-shaped conductive member 51 is connected to a side surface to which the first oblique connection conductor 81 of the prismatic conductor 33 is connected with a screw 511, and is connected to the high potential terminal 21 of the smoothing capacitor 2 with a screw 512. The L-shaped conductive member 52 is connected to the side surface to which the second oblique connection conductor 82 of the prismatic conductor 34 is connected by a screw 521, and is connected to the low potential terminal 22 of the smoothing capacitor 2 by a screw 522.

In the first embodiment configured as described above, the rod-shaped conductor assembly 30 constituting the main circuit conductor is configured to output the high potential side output of the power module 1 from the prismatic conductor 31, the first oblique connection conductor 81, the prismatic shape. The conductor 33 is connected to the high potential terminal 21 of the smoothing capacitor 2, and insulation is maintained for the prismatic conductor 32 and the prismatic conductor 34. Further, the low potential side output of the power module 1 is connected to the low potential terminal 22 of the smoothing capacitor 2 via the prismatic conductor 32, the second oblique connection conductor 82, and the prismatic conductor 34, and to the prismatic conductors 33 and 31. Keep insulation.
In addition, the main circuit wiring constituted by the rod-shaped conductor assembly 30 can have the same wiring length on the high potential side and the wiring length on the low potential side. Heat generation from the main circuit wiring in the converter is suppressed.
Further, since the high potential side wiring and the low potential side wiring are in contact with each other through a thin-leaf insulating member similar to the insulating sheet materials 41 and 42, the high potential side wiring and the low potential side wiring are disposed between each other. Therefore, since the electrostatic capacity can be formed over the entire length of the main circuit wiring, noise generated from the main circuit wiring is reduced.

  Further, as illustrated in FIG. 3, the rod-shaped conductor assembly 30A and the rod-shaped conductor assembly 30B that are configured in the same manner with respect to the rod-shaped conductor assembly 30 are replaced by angle-shaped plate-like insulating members 71 and 72, and first, Connected in series sequentially via the second oblique connection conductors 81 and 82, and the additional smoothing capacitors 2A and 2B are similarly connected to the rod-shaped conductor assemblies 30A and 30B by L-shaped conductive members 51 and 52 (shown in FIG. 2). By connecting to the main circuit wiring, the high potential side conductor and the low potential side conductor can be alternately twisted to extend to a desired value. Thereby, the total capacity of the smoothing capacitor can be increased while maintaining the effects such as equalization of inductance, suppression of heat generation from the main circuit wiring, and reduction of noise generated from the main circuit wiring. In the example of FIG. 3, the prismatic conductor 31 of the rod-shaped conductor assembly 30 is sequentially connected to the prismatic conductor 33A, the prismatic conductor 31A, the prismatic conductor 33B, and the prismatic conductor 31B. Further, the prismatic conductor 34 is sequentially connected to the prismatic conductor 32A, the prismatic conductor 34A, the prismatic conductor 32B, and the prismatic conductor 34B.

  As described above, according to the first embodiment, the rod-shaped conductor assembly 30 configured by the four prismatic conductors 31 to 34 is used as the main circuit wiring for connecting the power module 1 and the smoothing capacitor 2. Therefore, the inductance of both the high potential side conductor and the low potential side conductor can be reduced, and the twisted structure makes it possible to make the inductance of the high potential side conductor and the low potential side conductor uniform. Heat generation from the main circuit wiring can be suppressed. Further, since the high-potential side wiring and the low-potential side wiring are in contact with each other through the insulating sheet materials 41 and 42, the entire length of the main circuit wiring is between the high-potential side wiring and the low-potential side wiring. Therefore, the noise generated from the main circuit wiring can be reduced. Further, by connecting the rod-shaped conductor assembly 30 in series, the high-potential side conductor and the low-potential side conductor constituting the main circuit wiring can be extended while being alternately twisted. The total capacity can be increased, and the effect of further reducing noise generated from the main circuit wiring can be obtained.

Embodiment 2. FIG.
4A and 4B are diagrams showing a configuration of a rod-shaped conductor assembly in a power conversion device according to Embodiment 2 of the present invention, where FIG. 4A is an assembled perspective view, and FIG. 4B is a side view illustrating the configuration of a convex portion. . FIG. 5 is an assembled perspective view showing the positional relationship between the oblique connection conductor shown in FIG. 4 and an insulating member having a plurality of stepped surfaces formed in a step shape, and FIG. 6 is a second embodiment of the present invention. It is a perspective view which shows the structural example in the case of adding a some smoothing capacitor to the power converter device by. In the second embodiment, in order to increase the allowable current capacity of the oblique connection conductors 81 and 82 in the first embodiment, the shape thereof is changed to thick plate-like first and second oblique connection conductors 81A and 82A. According to the change, the shape of the opposing surfaces of the rod-shaped conductors which are other elements constituting the rod-shaped conductor assembly 30C, the shape of the insulating member, and the like are changed.

  As shown in the figure, the opposing surfaces of the prismatic conductor 31C, which is the first rod-shaped conductor, and the prismatic conductor 32C, which is the second rod-shaped conductor, and the prismatic conductor 33C, which is the third rod-shaped conductor, and the fourth Convex surfaces 9 that are opposite to the prismatic conductor 34 </ b> C, which is a rod-shaped conductor, are formed with convex portions 9 that are symmetrical with respect to the longitudinal section when viewed from the side. Then, by extending the extending direction of the front side stepped portion 91 forming the convex portion 9 and the back side stepped portion 92 on both the front and back sides of the first to fourth prismatic conductors 31C to 34C, respectively. An oblique connection conductor accommodating portion D1 is formed on the front side of the four prismatic conductors, and an oblique connection conductor accommodating portion D2 is formed on the back side. For convenience of explanation, the upper side of the figure is the front side and the lower side is the back side. In addition, a certain gap is formed between the tip portions 9a of the convex portions 9 facing each other.

  The difference between the insulating sheet material 41A of the first embodiment and the insulating sheet material 41A bent in a crank shape is that the portion corresponding to the convex portion 9 is the portion of the prismatic conductor 33C facing the prismatic conductor 34C. The side of the convex portion 9 facing the prismatic conductor 32C and the front end surface 9a of the convex portion 9 are covered, and the width is formed narrow so that the surfaces of the front side step portion 91 and the back side step portion 92 are exposed. There is in point. The same applies to the insulating sheet material 42A, and the portion corresponding to the convex portion 9 is convex with the side surface of the convex portion 9 facing the prismatic conductor 34C at the portion facing the prismatic conductor 32C. The front end surface 9a of the portion 9 is covered, and the width is formed narrow so that the front side step portion 91 and the back side step portion 92 are exposed.

The first insulating member 73 made of a thin-leaf insulating material and formed with a plurality of stepped surfaces bent in a staircase shape is 1) a front side stepped surface 91a of the prismatic conductor 32C, and 2) a front side step. The portions 91, 3) are formed so as to sequentially cover the front end surface 9a, and then, through a gap, 4) the back side stepped portion 92 of the prismatic conductor 31C, and 5) the back side stepped portion facing surface 92a. ing.
The second insulating member 74 formed in the same manner covers 1) the front-side stepped portion facing surface 91a of the prismatic conductor 34C, 2) the front-side stepped portion 91, 3) the tip end surface 9a in sequence, and then through the gap 4 It is formed so as to sequentially cover the back side stepped portion 92 of the prismatic conductor 33C, and 5) the back side stepped portion facing surface 92a.

  Insulating sheet materials 41A and 42A formed by bending the oblique connection conductor accommodating portions D1 and D2 formed by the convex portions 9 of the first to fourth four prismatic conductors 31C to 34C into a crank shape as described above. As a result of covering with the first and second insulating members 73 and 74 formed in a staircase shape, the front-side step of the prismatic conductor 31C at one diagonal position in the diagonal connection conductor housing portion D1 on the front side The front-side step 91 of the portion 91 and the prismatic conductor 33C is exposed, and the front-side step 91 of the prismatic conductor 32C and the front-side step 91 of the prismatic conductor 34C at the other diagonal position are insulated sheet materials 41A, 42A, Since the first and second insulating members 73 and 74 are electrically insulated from each other, the thick plate-like first oblique connection conductor 81A is fixed to the front-side step portion 91 of the exposed portion with a screw 813. Diagonal with columnar conductor 31C Prismatic conductor 33C of the location are electrically connected. Similarly, in the rear-side oblique connection conductor accommodating portion D2, the thick plate-like second oblique connection conductor 82A is fixed to the rear-side step portion 92 exposed by the screw 823, so that the prismatic conductor 32C and the diagonal position are diagonally positioned. The prismatic conductor 34C is electrically connected.

  6 shows a rod-shaped conductor assembly 30D using prismatic conductors 31D, 32D, 33D, and 34D that are substantially the same as the rod-shaped conductor assembly 30C shown in FIGS. 4 and 5, and prismatic conductors 31E, 32E, 33E, and 34E. The rod-shaped conductor assembly 30E used and the additional smoothing capacitors 2A and 2B are connected in the same manner as in FIG. 3, and the L-shaped conductive connecting member 53 is connected to the prismatic conductor 32C and the L-shaped conductor 33C is L-shaped. L-shaped conductive connecting member 53A is connected to the rectangular conductive connecting member 54 and the prismatic conductor 34E, and the L-shaped conductive connecting member 54A is connected to the prismatic conductor 31E, and the L-shaped conductive is connected to the side surface of the prismatic conductor 32D. The connecting member 61A, the L-shaped conductive connecting member 62A on the side surface of the prismatic conductor 31D, the L-shaped conductive connecting member 61B on the side surface of the prismatic conductor 32E, and the L-shaped conductive connecting member on the side surface of the prismatic conductor 31E. 62B connected It is intended. Note that the prismatic conductors 31C, 32D, 31D, and 32E and the prismatic conductors 34C, 33D, 34D, and 33E all have convex portions 9 formed at both ends in the longitudinal direction, which is the current flow direction. From the lower left side to the upper right side, prismatic conductors are connected in a zigzag or zigzag manner so that the current path is twisted sequentially.

In the second embodiment configured as described above, the inductance can be reduced for both the high-potential side conductor and the low-potential side conductor, and the high-potential side can be reduced by having a twisted structure. In addition to making it possible to make the inductance of the conductor and the low-potential-side conductor uniform, it is possible to obtain effects such as suppression of heat generation from the main circuit wiring, and in addition, the first oblique connection conductor 81 constituting the main circuit wiring. And the second diagonal connection conductor 82 are constituted by thick plate-like first and second diagonal connection conductors 81A and 82A, so that the reduced portion of the current path can be eliminated. Heat generation due to a direct current flowing through the wiring can be suppressed.
Furthermore, since the power module 1 and the smoothing capacitors 2, 2A, 2B can be freely connected to the respective L-shaped conductive connection members, the degree of freedom of component placement in the power converter is improved, and the product Thus, the effect of facilitating the downsizing and thermal design can be obtained.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted. For example, although the case where this invention is used for the converter which converts three-phase alternating current power into direct-current power was demonstrated, it is obvious that it can be used for the inverter which converts direct-current power into three-phase alternating current power. Further, for example, conductors such as prismatic conductors (bar-shaped conductors) 31 to 34, first and second oblique connection conductors 81 and 82, L-shaped conductive members 51 and 52, L-shaped conductive connection members 61 and 62, and the like. The shape or the shape of the insulating material such as the insulating sheet materials 41 and 42, the angle plate-shaped insulating members 71 and 72, the first and second insulating members 73 and 74, and the like can be appropriately modified or changed.

  1 Power module, 11, 12, 13 terminal, 14 DC high potential side terminal, 15 DC low potential side terminal, 16 Brake terminal, 2, 2A, 2B Smoothing capacitor, 21 High potential terminal, 22 Low potential terminal, 30, 30A , 30B, 30C, 30D Rod-shaped conductor assembly, 31, 32, 33, 34 Rectangular columnar conductor (first to fourth rod-shaped conductors), 41, 41A, 42, 42A Insulating sheet material, 51, 52 L-shaped conductive 511, 512 screw, 521, 522 screw, 61, 62 L-shaped conductive connecting member, 611, 612 conductive screw, 621, 622 conductive screw, 71, 72 chevron plate-shaped insulating member, 71a, 72a hem 73 First insulating member, 74 Second insulating member, 81, 81A First diagonal connecting conductor, 811, 812, 813 Screw, 82, 82A Second diagonal connecting conductor , 821, 822, 823 Screw, 9 convex portion, 9a tip portion, 91 front side step portion, 91a front side step portion facing surface, 92 back side step portion, 92a back side step portion facing surface, D1 oblique connection conductor housing portion, D2 Diagonal connection conductor housing.

Claims (6)

A power module having a circuit unit for converting DC power to AC power or converting AC power to DC power, and a DC high potential side terminal and a DC low potential side terminal;
A smoothing capacitor having a high potential terminal connected to the DC high potential side terminal and a low potential terminal connected to the DC low potential side terminal;
A first rod-shaped conductor connected to the DC high potential side terminal, a second rod-shaped conductor connected to the DC low potential side terminal, a third rod-shaped conductor connected to the high potential terminal, and the low potential A fourth rod-shaped conductor connected to the terminal, and the second rod-shaped conductor is arranged so as to be arranged in series with a gap at an end portion of the first rod-shaped conductor in the current flow direction, The third rod-shaped conductor is disposed in parallel and close to the second rod-shaped conductor via an insulating sheet material, and the fourth rod-shaped conductor is disposed via the insulating sheet material with respect to the first rod-shaped conductor. Are arranged in parallel with each other and arranged in series with the third rod-shaped conductor at intervals, and further, an end portion of the first rod-shaped conductor in the current flow direction and an oblique position thereof are arranged. A first oblique connection conductor for electrically connecting the third rod-shaped conductor; And a rod-shaped conductor assembly having a second diagonal connection conductor for electrically connecting an end portion of the second rod-shaped conductor facing the first rod-shaped conductor and the fourth rod-shaped conductor at an oblique position thereof. When,
The power converter is characterized in that the wiring lengths of the high-potential side conductor and the low-potential side conductor connecting the power module and the smoothing capacitor are equal.   The first and fourth rod-shaped conductors are composed of prismatic conductors having the same shape, and the second and third rod-shaped conductors are composed of prismatic conductors having the same shape, and the first rod-shaped conductor and the The end surfaces of the second rod-shaped conductors facing each other have the same shape, and the end surfaces of the third rod-shaped conductor and the fourth rod-shaped conductor facing each other have the same shape. Power converter.   The first diagonal connection conductor and the second diagonal connection conductor have three sides bent in a crank shape, and the plate width is less than half the cross-sectional dimension of the prismatic conductor. It is made of a conductor, and the side of the central portion is surrounded by a plate-like insulating member and is flush with each other between the first and second rod-shaped conductors and between the second and third rod-shaped conductors. The bent pieces that are arranged side by side and bent in a predetermined direction with respect to the side of the central portion are electrically connected to the side portions of the corresponding first, second, third, or fourth rod-shaped conductors. The power conversion device according to claim 2, wherein the power conversion devices are connected together.   The insulating sheet material provided between the third rod-shaped conductor and the second rod-shaped conductor covers a surface of the third rod-shaped conductor facing the end of the fourth rod-shaped conductor. The insulating sheet material provided between the first bar-shaped conductor and the fourth bar-shaped conductor has an extended bent side portion, and the second bar-shaped in the first bar-shaped conductor. The power conversion device according to any one of claims 1 to 3, further comprising a bent side portion extending so as to cover a surface facing the end portion of the conductor.   The longitudinal cross sections of the opposing surfaces of the first rod-shaped conductor and the second rod-shaped conductor and the opposing surfaces of the third rod-shaped conductor and the fourth rod-shaped conductor are both viewed from the side. Formed by symmetrical convex portions, the extending directions of the step portions in the convex portions are aligned on both the front and back sides of the four rod-shaped conductors from the first to the fourth, respectively, so that the front side and the rear surface of the convex portions A pair of diagonal connection conductor housing portions symmetrical on the side, and the surface of the stepped portion at a predetermined diagonal position in the pair of diagonal connection conductor housing portions is covered with an insulating material, and the pair of diagonal connection conductor housing portions 3. The power conversion device according to claim 2, wherein the plate-like first oblique connection conductor is installed on one side and the plate-like second oblique connection conductor is installed on the other side.   The insulating material is composed of a step-like insulating member provided with a plurality of stepped surfaces by bending a thin-leaf insulating material. The stepped portion of the first rod-shaped conductor covers the back side thereof, and the second The stepped portion of the rod-shaped conductor covers the first insulating member so as to cover the surface side thereof, and the stepped portion of the third rod-shaped conductor covers the back side thereof, and the step of the fourth rod-shaped conductor covers the stepped portion. The power conversion device according to claim 5, wherein a second insulating member installed so as to cover the surface side is used in the section.

Images