JPH09308267A - Bus bar and capacitor assembling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce inductance of bus bar and capacitor in the wirings for surge absorbing capacitor in an inverter circuit. SOLUTION: A pair of bus bars 1A, 1B opposed with each other are provided with a plurality of parallel wiring means 11A, 12, 11B where connecting means 31, 32 connected with the terminals of a capacitors 51 are arranged in the constant interval. Each of the capacitor 51 is connected in parallel along the wiring means 11A, 12A, 11B alternately in the inversed manner to provide different polarities of the positive and negative terminals 511, 512. One of the terminals 511, 512 is opposed in connection to the connecting means 31, 32 of the bus bar 1A (or 1B), while the other of the terminals 511, 512 is opposed in connection to the connecting means 31, 32 of the remaining bus bar 1B (or 1A).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for assembling a bus bar such as an inverter circuit and a capacitor.

[0002]

2. Description of the Related Art In an electric circuit, a stray capacitance or a wiring inductance is generated in a component or wiring forming the circuit in a mounted state, which makes the function of the circuit unstable and causes other troubles. For example, an inverter circuit installed in a vehicle or the like that converts the DC voltage of a battery into an AC voltage generates a surge voltage during a current rush when the current is cut off by a switching element, and a capacitor that absorbs this surge voltage is parallel to the DC power supply. It is connected to the. To sufficiently absorb the surge voltage, the capacitor needs to have a large capacitance, which increases the size. Further, since a large amount of current flows through the wiring line connected to the positive and negative terminals of the capacitor, a bus bar made of an electrically conductive plate member is required.

FIG. 13 shows an assembly structure of a bus bar and a capacitor. In order to improve space efficiency, the capacitors 91, 92 and 93 are provided with switching elements 94, 95 and 9 respectively.
It is provided adjacent to No. 6. Switching element 94 ~
A pair of positive and negative band-shaped bus bars 97 and 98 are arranged between the capacitor 96 and the capacitors 91 to 93.
An unillustrated power source is connected to 981. The bus bars 97 and 98 are connected to the emitter terminals and collector terminals provided on the surfaces of the switching elements 94 to 96 facing the capacitors 91 to 93, and extend from there along the side surfaces of the capacitors 91 to 93 to form the capacitors 91.
-93 positive and negative terminals 911, 912, 921, 922
931 and 932, respectively.

As shown in the figure, if parts such as capacitors are arranged compactly to improve space efficiency, the bus bar must be long. Then, the inductance of the bus bar increases, and the surge voltage increases due to the action of the inductance. On the contrary, if the bus bar is wired so as to be short, it becomes difficult to arrange the capacitors and the switching elements compactly. Then, JP-A-7-31
In Japanese Patent No. 165, two bus bars are made to face each other so that the directions of the currents flowing therethrough are opposite to each other, and mutual inductance is generated by the action of magnetic flux in the opposite direction generated by the currents, and the inductance of the bus bars is suppressed. There is something I did.

[0005]

However, unlike the electric wire, the bus bar has a width, so that the current distribution is not always uniform. Therefore, even if the busbars are physically close to and face each other, the sufficient effect of suppressing the inductance of the busbars is not always obtained. JP-A-7-311
It is not admitted that this point is taken into consideration in Japanese Patent Laid-Open No. 65, and the inductance of the capacitor itself is not described.

Therefore, an object of the present invention is to provide an assembly structure of a bus bar and a capacitor, which has a compact arrangement and a small inductance.

[0007]

According to a first aspect of the present invention, there is provided a connecting portion to which a terminal of a capacitor electrically connected in parallel is connected to an opposing bus bar at a predetermined interval. A plurality of wiring portions provided with a plurality of connecting portions to be arranged are formed in parallel in a plurality of columns, and a plurality of capacitors are arranged on the outside of the bus bar alternately in parallel so that terminals of adjacent capacitors have different polarities. The positive and negative terminals of the capacitor are connected so that one terminal of the positive and negative terminals faces the connection portion of the bus bar on the side where the capacitor is arranged, and the other terminal of the positive and negative terminals is connected. Is connected so as to face the connection portion of the remaining bus bar.

Since the terminals of the capacitors face the connecting portions of the bus bars and the polarities of the terminals of the adjacent capacitors are different, the current flowing through one of the bus bars is divided toward the wiring portion having the respective terminals, and each connecting portion is further connected. Disperse in and flow evenly. The current flowing through the other bus bar evenly flows out from each connection portion. Therefore, a current that flows in the opposite direction is locally formed between the positive bus bar and the negative bus bar. Also, since the adjacent capacitors have different polarities at their terminals, the currents flowing inside the capacitors are in opposite directions. Therefore, mutual inductance is generated in the bus bar and the capacitor by the action of the currents flowing in opposite directions, and the inductance of the bus bar and the capacitor is reduced.

According to the second aspect of the invention, the wiring portion is a discontinuous portion having a plurality of notches, and the position sandwiched by the notches is a connecting portion to which the terminals of the capacitor are connected.
The discontinuous portions are opposed to each other so that the notch portion of one bus bar and the notch portion of the other bus bar are located at mutual positions.
A capacitor is disposed on the outside of each bus bar, and the capacitor is connected to one of its terminals by a connection which remains through a notch in the bus bar on which the capacitor is disposed. Further compactness can be realized together with the effect of the invention described in 1.

According to the third aspect of the invention, the wiring portions are formed in three or more rows for each bus bar, and the capacitors are arranged in parallel so that their terminals are located along the wiring portions and in the column direction. By arranging the same and connecting the terminals of the same polarity, which are adjacent to each other in the column direction adjacent to each other, to the common connection portion, it is possible to realize the effect of the invention according to claim 1 and further downsizing.

According to the fourth aspect of the present invention, the discontinuous portion is formed in a tooth row shape by providing notches at predetermined intervals on the edge of the bus bar, so that the discontinuity can be easily processed.

According to the fifth aspect of the present invention, the discontinuous portion is formed by providing window-shaped notches at predetermined intervals along the edge of the bus bar to facilitate processing.

According to the sixth aspect of the present invention, lead portions for extracting currents from the positive side bus bar and the negative side bus bar are provided at positions where the positive side bus bar and the negative side bus bar face each other. By providing it, the direction of the current flowing through the portion sandwiched by the discontinuous portions is reversed, and a more remarkable effect of reducing the inductance of the bus bar is achieved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a three-phase inverter circuit using the assembly structure of a bus bar and a capacitor according to the present invention.
The switching elements 61A, 62A and 63A are connected in parallel to the lead portion 4A to which the positive side of the power source (not shown) is connected, and the switching elements 61B, 62B and 63B are parallel to the lead portion 4B to which the negative side of the power source is connected. Connected to. The emitter terminals E of the positive side switching elements 61A to 63A and the collector terminals C of the negative side switching elements 61B to 63B are connected, and three-phase outputs (u, v,
w) is to be taken out. Switching elements 61A and 61B, 62A and 6 connected in series
Snubber circuits 71, 72, 73 are connected in parallel to 2B, 63A and 63B, respectively, so that the peak value of the collector-emitter voltage of each switching element 61A-63A, 61B-63B is suppressed within the specified withstand voltage. Has become. A surge absorbing circuit 5 composed of a plurality of capacitors connected in parallel is connected between the positive terminal and the negative terminal of the power source, and the switching elements 61A to 63A,
The surge voltage at the time of current rush generated when the current is cut off by 61B to 63B is absorbed.

FIG. 2 shows an assembled structure of the bus bar and the capacitor of the present invention in a state where the surge absorbing circuit 5 is mounted. The pair of positive and negative bus bars 1A and 1B are partition-shaped copper plates facing each other, and the positive side bus bar 1A is arranged on the box-shaped switching elements 61A to 63A arranged on the same plane, and the negative side bus bar 1B. Is switching element 6
It is arranged on switching elements 61B to 63B (not shown) (not shown) provided in parallel on the same plane as 1A to 63A.

Adjacent to the outside of the busbars 1A and 1B, ten surge absorbing circuits 5 are provided for each of the busbars 1A and 1B.
Capacitors (FIG. 1) (for convenience of explanation, each bus bar 1A, 1B has three capacitors shown in the drawing for the sake of convenience, the remaining capacitors are omitted) 51a, 51b are arranged in parallel. The capacitors 51a and 51b are substantially columnar, and terminals 511 and 512 are drawn out from the upper and lower end faces, respectively, and are arranged upside down alternately so that the polarities of adjacent terminals are different.

In the positive side bus bar 1A, the lower edge 101 bent at a right angle has switching elements 61A to 63A.
Screwed to A, switching elements 61A-63
The collector terminal C (FIG. 1) (not shown) provided on the surface of A is brought into close contact with and electrically connected. On the other hand, in the negative side bus bar 1B, the lower edge is screwed to the switching elements 61B to 63B (FIG. 1) (not shown) similarly to the bus bar 1A, and is attached to the surface of the switching elements 61B to 63B (FIG. 1). The emitter terminal E (not shown) provided (not shown) is brought into close contact with and electrically connected.

Along the upper edge 102 of the bus bar 1A on the positive side, five rectangular notches 21 are formed at substantially equal intervals to the widths of the capacitors 51a and 51b. 1 is the discontinuous portion 11A.
The portion sandwiched between the notches 21 adjacent to each other is the connection portion 31.
Then, the capacitor 5 with the positive terminal 511 arranged upward
A connection terminal 311 to which the positive terminal 511 of 1a is connected is provided. Further, the bus bar 1A has five notch portions 21 along the lower edge 101 in parallel with the first discontinuous portion 11A.
Window-shaped notch with the same size as (2)
2 is formed to serve as the second discontinuous portion 12A of the bus bar 1A. A portion sandwiched between the adjacent window portions 22 is a connection portion 32, and a connection terminal 321 to which the positive terminal of the capacitor 51b having the positive terminal 511 arranged downward is connected.

On the other hand, along the upper edge of the negative bus bar 1B, the five notches 21 are located at the mutual positions with the notches 21 of the first discontinuous portion 11A of the positive bus bar 1A. Is formed as the first discontinuous portion 11B, and the negative terminal 512 of the capacitor 51b in which the negative terminal 512 is disposed upward is provided in the connection portion 31 sandwiched between the notches 21 adjacent to each other. A connection terminal 311 to which 512 is connected is provided.
In addition, along the lower end edge of the negative side bus bar 1B,
The five notches are formed so as to be positioned mutually relative to the window 22 of the second non-continuous portion 12A of the bus bar 1A on the positive side, which is a second non-continuous portion (not shown).

Of the capacitors 51a and 51b arranged on the positive side bus bar 1A side, the positive terminal 511 of the capacitors 51a and 51b faces upward, and the positive terminal 511 of the capacitors 51a and 51b is the first discontinuous portion 1.
The negative terminal 512 faces the connection portion 31 of 1A and is connected to the connection terminal 311 thereof, and the negative terminal 512 faces the window portion 22 of the second discontinuous portion 12A. Also, the negative terminal 512 facing upward 51b has the positive terminal 511 of the second discontinuous portion 12A.
Is connected to the connection terminal 321 thereof, and the negative terminal 512 has the cutout 2 of the first discontinuous portion 11A.
It is facing 2. On the other hand, in the capacitors 51a and 51b arranged on the negative side of the bus bar 1B, the positive terminal 511 of the capacitors 51a and 51b is directed upwards. The negative terminal 512 faces the connecting portion of the second discontinuous portion (not shown) and is connected to the connecting terminal. The negative terminal 512 with the upward facing 51b has a positive terminal facing the window of the second discontinuous portion (not shown), and a negative terminal 512 facing the connecting portion 31 of the first discontinuous portion 11B. It is connected to the connection terminal 311.

The negative terminals 512 of the capacitors 51a and 51b arranged on the positive side bus bar 1A side facing the notches 21 and 22 formed on the positive side bus bar 1A are:
The notches 21 and 22 are connected to the connecting terminals 311 of the connecting portions 31 of the negative side bus bar 1B facing each other, and the capacitors 51a and 51b of the capacitors 51a and 51b arranged on the negative side bus bar 1B side,
The negative terminal 512 facing the cutout 21 and the like formed in the negative busbar 1B is connected to the connecting portions 31 and 32 of the positive busbar 1A where the cutout 21 and the like face each other.

In addition, the lead portions 4A, 4 are provided on the respective bus bars 1A, 1B from the positions where the side edges 103, 104 face each other.
B extends and is connected to a power source (not shown) to receive power supply from the power source.

The operation of the assembly structure of the bus bar and the capacitor will be described. When flowing from the lead portion 4B, for example, the current flowing between the lead portions 4A and 4B flows from the negative side bus bar 1B toward the capacitors 51a and 51b and circulates from the condensers 51a and 51b to the positive side bus bar 1A.

FIG. 3 shows the distribution of the current flowing through the bus bar at this time, in which the positive side bus bar and the negative side bus bar are overlaid. In the figure, + indicates a connection portion of the positive side bus bar, − indicates a connection portion of the negative side bus bar, + on the upper side is a connection portion of the first discontinuous portion, and + on the lower side. , -Are the connection parts of the second discontinuous part. The black arrow indicates the direction of the current flowing through the positive side bus bar, and the white arrow indicates the direction of the current flowing through the negative side bus bar. Also, B + indicates the lead portion of the bus bar on the positive side, and GN
D indicates the lead portion of the bus bar on the negative side. Since the capacitors are alternately arranged in opposite directions, the current is distributed to the upper side and the lower side of the negative side bus bar, and further distributed to each of the five connecting portions to flow into each connecting portion evenly. Further, in the positive side bus bar, it uniformly flows out from the connecting portion located substantially opposite to the connecting portion of the negative side bus bar. Moreover, the current disperses from the lead portion of the negative side bus bar and converges on the lead portion of the positive side bus bar at a position opposite to this. That is, the positive side bus bar and the negative side bus bar have opposite current directions and the same current distribution. As a result, mutual inductance is generated by the action of the magnetic flux generated by the current flowing in the opposite direction, and the inductance of the bus bar can be reduced.

FIG. 4 shows the direction of the current flowing through the capacitor, showing the capacitor arranged on the positive side bus bar side. In the figure, +,-, B +, GND are
Similar to FIG. 3, a positive side bus bar connection portion, a negative side bus bar connection portion, a positive side bus bar lead portion, and a negative side bus bar lead portion are shown. The arrow indicates the direction of the current flowing through the capacitor arranged on the positive side bus bar side.
In the present invention, since the capacitors are alternately arranged in opposite directions, the directions of current flow in the adjacent capacitors are opposite. As a result, mutual inductance is generated by the action of the magnetic flux generated by the current flowing in the opposite direction, and the inductance of the capacitor is reduced.

As described above, according to the present invention, the capacitor can be arranged compactly and the inductance of the bus bar and the inductance of the capacitor can be reduced.

In the above-described embodiment, the lead portions are provided at the positions facing each other, but the position of the lead portions is not limited to this depending on the required effect of reducing the inductance.

Although the number of capacitors to be mounted is 10 for each bus bar, it can be changed according to the power supply voltage and the capacity required to absorb the surge voltage. However, to obtain a sufficient current distribution of the busbars, 5 for each busbar
It is desirable that the number is about one or more. Further, the number of capacitors can be changed by increasing or decreasing the capacity per capacitor, and the overall shape of the capacitors and the bus bar can be easily laid out for other parts.

Further, each window portion of the second non-continuous portion does not necessarily have to be positioned vertically vertically downward from the connection portion of the first non-continuous portion, and each window portion may be positioned diagonally below the connection portion. By arranging the capacitors, the capacitors and the bus bars can be arranged in a slanted manner so that the overall shape of the capacitors and the bus bar is flat. The positional relationship between the bus bar and the capacitor and the switching element is not limited to that shown in FIG. 2, and the bus bar and the capacitor may be arranged horizontally with respect to the switching element.

(Second Embodiment) FIGS. 5 and 6 show another structure for assembling a bus bar and a capacitor according to the present invention. FIG. 6 is a view on arrow X in FIG. By increasing the capacity of each capacitor constituting the surge absorbing circuit, one of the positive and negative bus bars is provided with the capacitor outside the bus bar. In the figure, those given the same numbers as those in FIG. 2 have substantially the same operation, and therefore differences from the first embodiment will be mainly described. The pair of positive and negative bus bars 1D and 1E are copper plates facing each other with the insulating plate 81A interposed therebetween, and the bus bar 1D on the positive side.
Has a slightly smaller vertical dimension than the negative bus bar 1E. Box-shaped switching elements 64, 65, 66 are arranged along the back of the negative bus bar 1E.
The conductive extension rod 83 extending from the emitter terminal is connected to the switching element assembly terminal 831 so that the negative bus bar 1 is provided.
The extension rod 82 connected to E and extending from the collector terminals of the switching elements 64 to 66 has a through hole 1a formed in the negative side bus bar 1E and a through hole 8 formed in the insulating plate 81A.
11 is inserted and is connected to the positive side bus bar 1D by a switching element assembly terminal 821.

The bus bar 1D on the positive side has connection portions 33 formed at equal intervals along both end edges, and has wiring portions 11D and 12D.
It is as D. Further, the negative side bus bar 1E has connection portions 34 formed at equal intervals along both edges so that the connection portions 34 and the connection portions 33 of the positive side bus bar 1D are alternately located.
They are 1E and 12E. Each of the connecting portions 33 and 34 is provided with connecting terminals 331 and 341 for connecting a capacitor.

On the outside of the positive side bus bar 1D, seven capacitors (two on the right side in FIG. 6 are omitted) 52 forming a surge absorbing circuit are arranged in parallel, and the polarities of the terminals adjacent to each other are set. Differently, they are arranged alternately upside down.
In the capacitor 52 in which the positive terminal 521 of the capacitor 52 is arranged upward, the positive terminal 521 faces the connecting portion 33 of the first wiring portion 11D of the bus bar 1D on the positive side and is connected to the connecting terminal 331. Yes, the negative terminal 52
2 faces the connecting portion 34 of the second wiring portion 12E of the negative side bus bar 1E and is connected to the connecting terminal 341 thereof. On the other hand, in the capacitor 52b having the negative terminal 522 disposed upward, the positive terminal 521 faces the connecting portion 33 of the second wiring portion 12D of the bus bar 1D on the positive side and its connecting terminal 3
31 and the negative terminal 522 faces the connecting portion 34 of the first wiring portion 11E of the negative side bus bar 1E and is connected to the connecting terminal 341.

The operation of the above-mentioned structure for assembling the bus bar and the capacitor will be described. FIG. 7 shows the distribution of the current flowing through the bus bar, in which the positive side bus bar and the negative side bus bar are overlapped. In the figure, + indicates the connection terminal of the positive side bus bar, and-indicates the connection terminal of the negative side bus bar. Similar to the configuration of FIG. 2, the positive side bus bar and the negative side bus bar have opposite current directions and the same current distribution, and mutual inductance is generated due to the action of the magnetic flux generated by the current flowing in the opposite direction. The inductance of can be reduced.

FIG. 8 shows the directions of the currents flowing through the capacitors. Since the capacitors are alternately arranged in opposite directions, the directions of the currents flowing in the adjacent capacitors are opposite to each other, whereby the inductance of the capacitors is increased. Is reduced.

(Third Embodiment) FIGS. 9 and 10 show still another structure for assembling a bus bar and a capacitor according to the present invention.
FIG. 10 is a view on arrow Y of FIG. In the first embodiment shown in FIG. 2, the capacitors are arranged outside each of the bus bars. However, the capacitor is arranged outside one of the positive and negative bus bars to form a flat assembly structure. Is. In the figure, those given the same numbers as those in FIG. 2 have substantially the same operation, and therefore differences from the first embodiment will be mainly described. The pair of positive and negative busbars 1F and 1G are copper plates each having a width in the vertical direction in the drawing that is about twice the width of the capacitor assembled to the busbars 1F and 1G, and the insulating plates 81B are sandwiched between them. Box-shaped switching elements 64, 65, 66 are arranged along the back of the negative bus bar 1G. The conductive extension rod 83 extending from the emitter terminal is connected to the negative bus bar 1G by the switching element assembly terminal 831, and the extension rod 82 extending from the collector terminal is the through hole 1a formed in the negative bus bar 1G. The through hole 811 formed in the insulating plate 81B is inserted and connected to the positive side bus bar 1F by the switching element assembly terminal 821.

In FIG. 10, the positive side bus bar 1F is
Five window-shaped notches (hereinafter referred to as window portions) 23 are formed at symmetrical positions at equal intervals along both end edges 101 and 102, and are sandwiched between the edge portions 101 and 102 by the adjacent window portions 23. First and second discontinuous portions 11 whose position is the connecting portion 35
F and 12F. Each connection portion 35 is provided with a connection terminal 351 for connecting a capacitor.

Further, the first and second discontinuous portions 11F and 12F
A window portion 24 that is cut out so as to alternate with the window portion 23 is formed at an intermediate position of, and a third discontinuous portion 13F that has a connecting portion 36 at a position sandwiched by the adjacent window portions 24. Yes. Each connection portion 36 is provided with a connection terminal 361 for connecting a capacitor.

The negative side bus bar 1G is the positive side bus bar 1
The position facing the window portions 23 and 24 formed in F is the connecting portion 3
7 and 38, three rows of wiring portions (not shown) facing the first, second, and third discontinuous portions 11F, 12F, and 13F of the bus bar 1F on the positive side are formed. Each connection 3
7, 38 are provided with connection terminals 371, 381. Further, the insulating plate 81B has a window portion 23 of the bus bar 1F on the positive side,
As shown in FIG. 9, through holes 813 and 814 are provided at the same position as 24.
(Only those formed at the same positions as the window portions 23 of the first and second discontinuous portions 11F and 12F are shown).

On the outside of the positive side bus bar 1F, 11 capacitors are provided on the upper side and the lower side of the figure (only 6 are shown in the figure).
53 as one row, and the upper row has its terminals 531 and 532.
Are arranged in parallel along the first and third wiring portions 11F and 13F, and the terminals 531 and 532 of the lower row are second and
They are arranged in parallel along the third wiring portions 12F and 13F. In each capacitor 53, adjacent terminals 531 and 5 in the same column are arranged so that adjacent terminals 531 and 532 have different polarities and adjacent to each other in the vertical direction in the drawing.
They are arranged upside down alternately so that the polarities of 32 are the same.

In the upper row, of the capacitors 53, a positive terminal 531 is arranged upward, for example, a capacitor 53a.
Means that the positive terminal 531 faces the connection portion 35 of the first wiring portion 11F of the bus bar 1F on the positive side, and the connection terminal 35 is
1 and the negative terminal 532 is connected to the third wiring portion 13
In addition to being opposed to the F window portion 24, it is also opposed to the connection portion 38 of the third wiring portion of the negative side bus bar 1G and connected to the connection terminal 381 thereof. The capacitor having the negative terminal 532 arranged upward, for example, 53c, is a positive terminal 531.
Is connected to the connecting terminal 361 by facing the connecting portion 36 of the third wiring portion 13F of the positive side bus bar 1F, and the negative terminal 532 is facing the window portion 23 of the first wiring portion 11F. And is connected to the connection terminal 371 of the connection portion 37 of the first wiring portion of the negative side bus bar 1G. Further, in the lower row, the capacitor having the positive terminal 531 arranged upward, for example, 53d, has the positive terminal 531 connected to the connection terminal 361 of the third wiring portion 13F of the positive side bus bar 1F,
The negative terminal 532 is opposed to the window portion 23 of the second wiring portion 12F and connected to the connection terminal 371 of the negative bus bar 1G. In the capacitor having the negative terminal 532 facing upward, for example, 53b, the positive terminal 531 is connected to the connection terminal 351 of the second wiring portion 12F of the bus bar 1F on the positive side, and the negative terminal 532 is connected to the third terminal. Window portion 24 of the wiring portion 13F
And the connection terminal 381 of the negative side bus bar 1G.
Connected to.

Here, capacitors vertically adjacent to each other in the figure, for example, adjacent terminals 532 of 53a and 53b are both connected to the window portion 24 of the third wiring portion 13F and the negative side bus bar 1.
The connection portion 38 of the G wiring portion is common. Further, the capacitors adjacent to each other in the vertical direction, for example, the terminals 531 adjacent to each other of 53c and 53d are both connected to the connection portion 3 of the third wiring portion 13F.
6 is common.

The operation of the above-mentioned structure for assembling the bus bar and the capacitor will be described. FIG. 11 shows the distribution of the current flowing through the bus bar, in which the positive side bus bar and the negative side bus bar are overlapped. In the figure, + indicates the connection terminal of the positive side bus bar, and-indicates the connection terminal of the negative side bus bar. Two current distributions similar to those in the case of the second embodiment shown in FIG. 5 appear above and below, but the positive side bus bar and the negative side bus bar have opposite current directions and the same current distribution.
Mutual inductance is generated by the action of the magnetic flux generated by the current flowing in the opposite direction, and the inductance of the bus bar can be reduced.

FIG. 12 shows the directions of the currents flowing through the capacitors. As in the case of FIG. 5, the capacitors arranged in parallel are alternately arranged in the opposite direction. The flow direction is reversed, which reduces the inductance of the capacitor.

Further, the present invention can be applied not only to the structure for assembling the bus bar and the capacitor for the surge absorbing circuit attached to the inverter circuit, but also to other circuits in which it is necessary to reduce the inductance.

Although the capacitors are arranged outside the positive side bus bar in the second and third embodiments, they may be arranged outside the negative side bus bar. In this case, the structure is such that the positive terminal of the capacitor is connected to the connection terminal of the positive side bus bar through the window of the negative side bus bar.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an inverter circuit in which an assembly structure of a bus bar and a capacitor according to the present invention is implemented.

FIG. 2 is a perspective view showing an assembly structure of a bus bar and a capacitor of the present invention.

FIG. 3 is a diagram showing an operation of the assembly structure of the bus bar and the capacitor of the present invention.

FIG. 4 is another diagram showing the operation of the assembly structure of the bus bar and the capacitor of the present invention.

FIG. 5 is a partial cross-sectional side view showing another assembly structure of a bus bar and a capacitor of the present invention.

FIG. 6 is a view taken in the direction of arrow X in FIG. 5, showing another assembly structure of the bus bar and the capacitor of the present invention.

FIG. 7 is a diagram showing the operation of another bus bar and capacitor assembling structure of the present invention.

FIG. 8 is another diagram showing the operation of another bus bar and capacitor assembling structure of the present invention.

FIG. 9 is a partial cross-sectional side view showing another assembly structure of a bus bar and a capacitor of the present invention.

FIG. 10 is a view taken in the direction of the arrow Y in FIG. 9, showing still another bus bar and capacitor assembling structure of the present invention.

FIG. 11 is a diagram showing an operation of still another bus bar and capacitor assembling structure of the present invention.

FIG. 12 is another view showing the operation of still another bus bar and capacitor assembling structure of the present invention.

FIG. 13 is a perspective view showing a conventional assembly structure of a bus bar and a capacitor.

[Explanation of symbols]

1A, 1B, 1D, 1E, 1F, 1G Bus bar 11A, 12A, 11B, 11F, 12F, 13F Discontinuous part 11D, 11E Wiring part 21, 22, 23, 24 Notch part 31, 32, 33, 34, 35 , 36, 37, 38 Connection parts 4A, 4B Lead parts 51a, 51b, 52, 52a, 52b, 53, 53
a, 53b, 53c, 53d capacitors 511, 512, 521, 522, 531, 532 terminals

Claims (6)

[Claims] 1. A pair of positive and negative bus bars made of an electrically conductive plate-like member are provided facing each other, and terminals of a capacitor electrically connected in parallel between the pair of positive and negative bus bars are connected to the bus bars. Wiring parts provided with a plurality of connection parts arranged at predetermined intervals are formed in parallel in a plurality of columns, and a plurality of capacitors are provided outside the bus bar, and positive and negative terminals thereof are connected to the wiring. The capacitors are arranged in parallel so that they are located along the section, and the capacitors adjacent to each other are alternately arranged in opposite directions so that the polarities of these terminals are different, and the capacitor has one of its positive and negative terminals A bus bar characterized in that it is connected to the connection portion of the bus bar on the side where the capacitor is disposed so as to face the connection portion, and the other terminal of the positive and negative terminals is connected so as to face the connection portion of the remaining bus bar. Conden Service assembly structure. 2. The assembly structure of a bus bar and a capacitor according to claim 1, wherein the wiring portion is a discontinuous portion provided with a plurality of notches arranged at predetermined intervals, and a phase of the discontinuous portion is formed. The place sandwiched between adjacent notches is the above-mentioned connecting part, and the discontinuous part of the positive side bus bar and the discontinuous part of the negative side bus bar are made to face each other so that the respective notch parts are in alternating positions, The above-mentioned capacitors are arranged outside the both bus bars, and the capacitors arranged on the positive side bus bar side are
The positive terminal is connected to the connection portion of the positive side bus bar by facing it, and the negative terminal is connected to the connection portion of the negative side bus bar by facing the cutout portion of the positive side bus bar, On the other hand, the capacitor arranged on the negative side bus bar side is connected with its negative terminal facing the connection part of the negative side bus bar, and its positive terminal facing the cutout part of the negative side bus bar. At least an assembly structure of a bus bar and a capacitor connected to the connection part of the bus bar on the positive side. 3. The assembly structure of a bus bar and a capacitor according to claim 1, wherein the wiring portion of the bus bar on the side where the capacitor is arranged is provided with a plurality of notches arranged at predetermined intervals. A place which is a continuous portion and is sandwiched between the notches adjacent to each other of the discontinuous portion is defined as the connection portion, and the wiring portion of the bus bar on the side where the capacitor is disposed and the wiring portion of the remaining bus bar are respectively formed. Connect the connecting parts so that they are in alternate positions, and connect the above wiring parts to each bus bar by 3
The capacitors are formed in columns or more, the capacitors are arranged in parallel and in columns so that the positive and negative terminals are located along the wiring portion, and capacitors adjacent to each other in columns have the same polarity at the terminals adjacent to each other. So that one of the positive and negative terminals of the capacitor is connected to the connection portion of the bus bar on the side where the capacitor is disposed so as to oppose to the other of the positive and negative terminals. Is connected to the connection portion of the remaining bus bar by facing the notch portion of the bus bar, and the terminals of the same polarity, which are adjacent to each other in the column direction and have the same polarity, are connected to the common connection portion. Attachment structure. 4. The busbar-capacitor assembly structure according to claim 2 or 3, wherein the discontinuous portion is formed in a tooth row shape by providing notches at predetermined intervals in the busbar. Assembly structure. 5. The assembly structure of a bus bar and a capacitor according to claim 2, wherein the discontinuous portion is formed by providing window cutouts at predetermined intervals on the bus bar. Assembly structure. 6. The busbar-capacitor assembling structure according to claim 1, wherein lead portions for taking out currents from the positive side busbar and the negative side busbar are provided at positions facing each other. And capacitor assembly structure.