JPH1014254A - Electric rolling stock controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rolling stock controller which can attain improvement in assembling ease and size reduction, without scarifying the reducing effect and heat dissipation properties of a wiring inductance. SOLUTION: This electric rolling stock controller is provided with a printed circuit board 5 which involves a smoothing capacitor 2, a switching element 3 and an insulation support 4 mounted on a heat sink 1, and which a capacitor 7, a diode 8, a resistor 9 and a current sensor 10 mounted on the switching element 3 as circuit components. An AC output terminal 3c and an insulation support 4 are connected, using a conductor bar 11 through an AC output terminal 3c and the insulation support 4. A negative conductor plate 12 and a positive conductor plate 14 which clamp an insulator 13 are placed, and respective positive and negative terminals of the smoothing capacitor 2 and the switching element 3 are connected, respectively through the negative conductor plate 12 and the positive conductor plate 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a large current conducting portion of a control device for an electric vehicle, and is particularly suitable for improving the assembling workability and reducing the size of the control device for an electric vehicle.

[0002]

2. Description of the Related Art The structure of a large-current energizing section of a conventional electric vehicle control device for controlling an electric motor for an electric vehicle is disclosed in Japanese Patent Application Laid-Open No. 3-285570.
According to this, each positive electrode and each negative electrode of each smoothing capacitor and each switching element are integrally connected by a pair of conductive plates, and the pair of conductive plates are insulated by an insulating plate inserted between them. The parallel conductor consisting of the pair of conductor plates and the insulating plate has a structure having a large surface area enough to cover the surfaces of all the smoothing capacitors and the switching elements to reduce the wiring inductance and improve the heat dissipation. ing.

[0003]

However, in the above-described conventional electric vehicle control device, although the inductance can be reduced and the heat radiation property can be improved, the arrangement of the snubber circuit components, the positioning of the insulating plate, and the like are taken into consideration. There is no space, and there is a wasteful occupied space, and there is a problem in assemblability and miniaturization.

Accordingly, an object of the present invention is to provide a control device for an electric vehicle that can be assembled and reduced in size without impairing the effect of reducing wiring inductance and heat radiation.

[0005]

The object of the present invention is to provide a group of smoothing capacitors for smoothing a DC power supply, a group of switching elements arranged in parallel for converting the smoothed DC power into an AC power,
Snubber circuit means for protecting the switching element group,
A current sensor that detects control information from the DC power supply and the AC power supply, and lower and upper conductor plates that electrically connect the smoothing capacitor group and the switching element group with an insulating plate interposed therebetween. In the control device for an electric vehicle mounted on a heat sink, a dimension difference space is formed on the switching element group by setting the height of the switching element group shorter than the height dimension of the smoothing capacitor group, In the dimension difference space, at least the snubber circuit means or the current sensor of the current sensor, and at least the integrated printed circuit board including the snubber circuit means, the lower conductor plate, the insulating plate, and the upper conductor plate, This is achieved by sequentially placing and mounting.

According to the present invention, the space is effectively used, and the components are sequentially placed, so that the assemblability is improved and the size is reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an electric vehicle control device according to one embodiment of the present invention. FIG. 4 is a diagram illustrating a structure of a large current conducting unit according to the present invention. FIG. 2 shows FIG.
It is a top view which shows the control apparatus for electric vehicles of FIG. FIG. 3 shows FIG.
It is a front view which shows the control apparatus for electric vehicles of FIG. FIG.
FIG. 4 is a partial bird's-eye view showing the vicinity of a smoothing capacitor of the electric vehicle control device of FIG. A control device for an electric vehicle (mainly a structure of a large current conducting portion) of the present embodiment will be described with reference to FIGS.

A control device for an electric vehicle (hereinafter referred to as a control device)
The large-current conducting section of FIG. 1 includes one heat sink 1, four smoothing capacitors 2, six switching elements 3, three insulating supports 4, one printed circuit board 5, and 18 terminals. 6, three conductor bars 11, an integral negative electrode conductor plate 12, an insulating plate 13, an integral positive electrode conductor plate 14, AC wirings 21, 22, 23, bolts, nuts, And a mounting screw part such as a washer. The individual components described above are as follows.

The heat sink 1 is a mounted body of the above components that also serves as a cooling medium, and cools electronic and electric components and the like.
In this embodiment, a water-cooled type is adopted for downsizing.
The smoothing capacitor 2 is a plurality of smoothing capacitors for smoothing a DC power supply that has been converted to a direct current.
A plurality of electrolytic capacitors are juxtaposed to form a smoothing capacitor group. The adjacent interval between the main bodies of the smoothing capacitor 2 is a minimum gap that can be assembled, and the positive terminal 2a and the negative terminal 2b on the DC side of the smoothing capacitor 2 are
The capacitors are arranged in parallel with a terminal-to-terminal dimension unique to the capacitor.

In other words, the smoothing capacitor group is a group of smoothing capacitors in which adjacent positive electrode terminals and adjacent negative electrode terminals of the smoothing capacitor 2 form a straight line and are arranged side by side. The positive terminal 2a and the negative terminal 2b have terminal bolts and terminal seats. The terminal bolts are used to mount each conductor plate described later, and the terminal seats are used to mount each conductor plate.

The switching elements 3 are a plurality of semiconductor elements for inverting a DC power supply into an AC power supply by a switching method, and each of the switching elements 3 has adjacent DC-side positive and negative terminals 3a and 3b and an AC-side AC output. Terminal 3c
Are arranged linearly and in parallel with the terminal row of the smoothing capacitor 2. In other words, the switching element group is a switching element group in which the adjacent positive electrode terminals of the switching element 3 and the terminal rows of the negative electrode terminals are arranged in a straight line. Further, the adjacent intervals between the main bodies of the switching elements 3 are arranged with a minimum gap that can be assembled.

The positive terminal 3a, the negative terminal 3b, and the AC output terminal 3c have terminal bolts and terminal seats extending long and upward. The terminal bolts are used to attach mounting feet of each conductor plate described later, and the terminal seats are used to mount a printed board 5 described later. Also, as shown in FIGS. 1 and 2, the distance between the smoothing capacitor group and the switching element group is set to a size in which the insulating support 4, which will be described later, and the AC wirings 21, 22, and 23 for three-phase AC output can be arranged. Is done. In some cases, the dimensions are set such that a current sensor 10a for monitoring three-phase AC output described later can be arranged.

Further, in the smoothing capacitor 2 and the switching element 3 used in the electric vehicle control device, the height of the switching element 3 is shorter than the height of the smoothing capacitor 2. The reason for this is to form a dimensional difference space that can be integrated into a printed circuit board including a snubber circuit means and a current sensor as described later.

Further, a positive electrode terminal 2a of the smoothing capacitor 2 is disposed on the outside as shown in FIG. 1 so that a pair of positive and negative conductor plates (a negative conductor plate 12 and a positive conductor plate 14, which will be described later) are not crossed. If so, the positive terminal 3a of the switching element 3 is also arranged outside, and if the negative terminal 2b is inside, the negative terminal 3a of the switching element 3 is also arranged inside. Further, as shown in FIG. 2, the center of the horizontal arrangement of the smoothing capacitors 2 and the center of the horizontal arrangement of the switching elements 3 are arranged so as to be displaced from each other.

Next, the insulating support 4 is a support having an integral structure in which an intermediate portion is made of an insulating material and both end portions are made of metal mounting screws. It is located between (in the horizontal direction). The insulating support 4 is provided with a conductor bar 11, which will be described later, for taking out a three-phase AC power supply, and AC wirings 21 and 22.
It is an intermediate connector connected to 2, 23. The height of the insulating support 4 is set to be higher than the height of the switching element group and lower than the height of the smoothing capacitor group. That is, the height is set to an intermediate height (in the height direction) between the smoothing capacitor group and the switching element group.

As shown in FIG. 1, the height of the insulating support 4 from the heat sink 1 is set to the height of the AC terminal 6c from the heat sink 1 to be described later. This is because the conductor bar 11 and the AC wirings 21 and
2 and 23 are stored at an intermediate position (horizontal direction) between the smoothing capacitor group and the switching element group. If the heights are the same, the conductor bar 11 has a flat plate structure with no bent shape, occupying less space, and has an advantage in workability.

The smoothing capacitor 2, the switching element 3, and the insulating support 4 are mounted directly on the heat sink 1 by the above-mentioned mounting screw.

On the other hand, the printed circuit board 5 includes a capacitor 7, a diode 8,
A snubber circuit component such as a resistor 9 and, if necessary, a current sensor 10 (AC current sensor 10a or DC current sensor 10b) are further connected to a signal line relay connector 20 to another control unit or the like. Is a circuit board integrally mounted with the electronic and electrical components of the above. In the prior art, the snubber circuit components are separately arranged, and the current sensor 10 is independently arranged outside the smoothing capacitor 2. The portion of the snubber circuit means where the current used is relatively small is formed on a circuit board. That is, snubber resistors having dimensions that are not advisable to be mounted on the printed circuit board 5 are arranged aside as shown in FIG.

The printed circuit board 5 is placed in a dimension difference space formed on the switching element group by a height dimension difference between the smoothing capacitor group and the switching element group shorter than the smoothing capacitor group. It is. It is to be noted that mounting the snubber circuit means and the current sensor 10 integrally on a printed circuit board leads to downsizing.

Generally, the required dimension of the above-mentioned dimension difference space is:
In the printed circuit board in which only the snubber circuit means is integrally formed, the height is determined from the height of the capacitor 7 or the diode 8, and in the printed board in which the snubber circuit means and the current sensor 10 are integrally formed, the height is determined from the height of the current sensor 10. Can be In particular, on a printed circuit board on which the current sensor 10 is mounted, the smoothing capacitors are arranged side by side in consideration of the respective capacities of the smoothing capacitor 2 and the switching element 3 which allow a large current so as to secure the required height of the current sensor 10. “Height” and “number” of the capacitor 2 and the switching element 3 are selected.

From the capacity of the smoothing capacitor 2 and the switching element 3 at the present stage, in order for the dimension difference space to be a space dimension that can include the height dimension of the current sensor 10, the height of the switching element group It has been found that a combination in which the size is less than or equal to 1/2 the height of the smoothing capacitor group is preferable. Further, a printed circuit board 5 mounted on the switching element 3
Are set to a size that covers all of the switching elements 3 as shown in FIG. This is determined from the dimensions and the number of components mounted on the printed circuit board 5 described above.

The terminal 6 has positive and negative terminals (3a, 3b) on the DC side of the switching element 3 and an AC output terminal 3
This is a hollow cylindrical conductive distance piece that is inserted into the mounting screw portion in order to use the mounting screw portion (terminal bolt) of c. As shown in FIG. 1, the terminals 6 (the positive terminal 6a, the negative terminal 6b, and the AC terminal 6c) are mounted on the printed board 5 and protrude above the printed board 5. The terminal 6 is provided with a later-described conductor bar 11 and a mounting foot portion of each conductor plate, which secures a space for avoiding interference with snubber circuit components and other components, and at the same time, performs electrical connection. . The printed circuit board 5 may be pressed by the terminal 6 or may simply penetrate the printed circuit board 5.

The conductor bar 11 is an AC wiring for transmitting the AC converted by the switching element 3 to a motor (not shown). As shown in FIGS. 1 and 2, the conductor bar 11 penetrates a predetermined hole of the current sensor 10 and
The AC output terminal 3c of the switching element 3 and the insulating support 4 are mounted and connected via the mounting screw portion via the mounting screw c. The AC wirings 21, 22, and 23 are also wirings for taking out a three-phase AC power supply, and are provided via the insulating support 4 described above.
The conductor bar 11 is connected to AC wirings 21, 22, 23.

The negative conductor plate 12 as a lower conductor plate is a wiring for a large current connecting the negative terminal 2b of the smoothing capacitor 2 and the negative terminal 3b of the switching element 3. Figure 1
As shown in FIG. 2, the negative electrode conductive plate 12 has a flat portion 12a having a width substantially covering each negative electrode terminal 2b of the smoothing capacitor group and each negative electrode terminal 3b of the switching element group, and a negative electrode terminal on the negative electrode terminal 3b side. A mounting foot portion 12b is provided for mounting and connecting to the negative terminal 6b, and the negative terminal 3b and the negative terminal 2b are mounted and connected using mounting screws using the negative terminal 6b.

The positive conductor plate 14 as the upper conductor plate is a wiring for a large current connecting the positive terminal 2a of the smoothing capacitor 2 and the positive terminal 3a of the switching element 3. The positive electrode conductor plate 14 has a flat portion 14a having a size equal to or larger than that of the negative electrode conductor plate 12, a mounting foot portion 14e for mounting and connecting to the positive terminal 2a, and a mounting portion for connecting to the positive terminal 6a on the positive terminal 3a side. Mounting foot 14b. Then, a conductor plate 14 is placed on an insulating plate 13 described later.
The mounting foot 14e is mounted and connected to the positive terminal 2a of the smoothing capacitor 2 and the mounting foot 14b is mounted and connected to the positive terminal 6a on the positive terminal 3a side of the switching element 3 with mounting screw parts.

Further, as shown in FIG.
Has an insulating hole 14c concentric with the negative electrode terminal 2b and at the same pitch as the negative terminal 2b and the mounting screw portion at a portion where the negative terminal 2b and the mounting screw portion of the smoothing capacitor 2 penetrate. An electrically insulating creepage distance (hereinafter, referred to as a creepage distance) secured through the insulating plate 13 between the electrode and the positive electrode conductor plate 14 is set to a size that is a predetermined creepage distance.

On the other hand, the insulating plate 13 is formed of an insulating material such as a resin and is mounted on the flat portion 12a. Negative electrode conductor plate 1
An insulator sandwiched between the positive electrode conductor plate 2 and the positive electrode conductor plate 14 to electrically insulate them. As shown in FIG. 4, the insulating plate 13 has a positioning hole 13b having the same pitch as the negative terminal 2b for penetrating and positioning the negative terminal 2b and the mounting screw portion of the smoothing capacitor 2. The positioning hole 1
The dimension of 3b is set to be slightly larger than the dimension of a mounting screw (washer outer diameter or nut shape) for mounting the negative electrode conductor plate 12 to the smoothing capacitor 2.
That is, when the insulating plate 13 is placed on the negative conductor plate 12, the mounting position of the insulating plate 13 is determined by bringing the insulating plate 13 into contact with a mounting screw portion penetrating the positioning hole 13b.

The positioning hole 13b and the above-described insulating hole 1
4c, the insulating plate 1
3 and the positive electrode conductor plate 14 is further superposed and mounted thereon, whereby the creeping distance between the terminal and the conductor plate can be easily and reliably secured. Also, by providing the positioning hole 13b and the insulating hole 14c, the mounting foot connected to the negative electrode terminal 2b of the negative electrode conductor plate 12 is a flat plate having no bent shape.
Since it has a (flattened) structure, there is also an effect that it leads to a reduction in component processing costs.

Further, as shown in FIG. 4, the safety valve 2d is visually recognized at a portion of the insulating plate 13 and the positive conductor plate 14 after being attached, which is opposite to the safety valve 2d for protecting the capacitor provided on the smoothing capacitor 2. A notch 13c or a visible hole 14d of a dimension as large as possible is provided as necessary. In this embodiment, a notch 13 c is formed in the insulating plate 13, and a visual recognition hole 14 d is provided in the positive conductor plate 14 as an upper conductor plate.

Further, as shown in FIGS. 1 and 4, the heights of the negative conductor plate 12 and the positive conductor plate 14 (the mounting foot 12
b and the height of the mounting foot 14b and the mounting foot 14e) are set to predetermined heights at which the insulating plate 13 can be sandwiched. Furthermore, as shown in FIG. 4, the insulating plate 13 has a length dimension for insulating the negative electrode conductor plate 12 and the positive electrode conductor plate 14 at a predetermined creepage distance.
It has an overhang 13a that extends over the entire periphery of the end portion where the negative electrode conductor plate 12 and the positive electrode conductor plate 14 face each other. The insulating plate 13 has an asymmetric shape like the negative conductor plate 12 because the center of the horizontal arrangement of the smoothing capacitor 2 and the switching element 3 is shifted as described above.
In the work of superimposing on the negative electrode conductor plate 12, there is an advantage that erroneous assembly can be prevented and confirmed.

That is, the control device for an electric vehicle comprising the above-described components has a plurality of switching elements on a heat sink plane, which reversely converts a direct current into an alternating current, and has a height of at least twice the height of the switching elements. A plurality of smoothing capacitors for smoothing the power supply are arranged with a slight gap between them, and the DC positive and negative terminals are arranged linearly in parallel with the terminals between the terminals of the smoothing capacitor in parallel and linearly. AC output terminal and DC positive / negative terminal are arranged linearly and in parallel with the DC positive / negative terminal of the smoothing capacitor. Set the dimensions so that the AC sensor for monitoring the AC output and the wiring for the three-phase AC output can be arranged.
On the switching element, a current sensor, a hollow cylindrical terminal grounded on each large current terminal of the switching element, and snubber circuit parts such as a snubber capacitor, a snubber diode and a snubber resistor terminal for the switching element are printed. Put the printed circuit board connected and mounted with the circuit,
The DC positive / negative terminal on the switching element and the positive / negative terminal of the smoothing capacitor have a size such that the entire width covers the switching element group and all the terminals of the plurality of smoothing capacitors so that the printed circuit board is included. The positive and negative electrodes facing each other with a slight gap up and down are electrically connected by an integral conductor plate, and the small gap in the integral conductor plate is the entire circumference of the lower conductor plate facing the upper conductor plate. The maximum height of the control device mainly consisting of the switching element and the smoothing capacitor is increased by the interposition of an insulating plate protruding with a predetermined insulation distance from the The thickness of the plate and the height of the terminal mounting screw portion of the smoothing capacitor can be set to a total value.

As described above, the high-current conducting portion of the control device of the present invention comprises the smoothing capacitor 2 (group) and the switching element 3
In the dimension difference space formed by the height dimension difference of (group), the integrated printed circuit board 5 including at least the snubber circuit means of the snubber circuit means or the current sensor 10 is arranged,
The configuration is such that the negative electrode conductor plate 12, the insulating plate 13, and the positive electrode conductor plate 14 are sequentially stacked so as to enclose the printed circuit board 5. In addition, by using the insulating support 4, the conductor bar 11 and the AC wirings 21, 22, and 23 for taking out the three-phase AC power are also arranged in the space having the dimensional difference, so that the space efficiency is improved. I have.

Next, referring to the embodiment shown in FIGS.
A procedure for assembling the control device, which is another feature of the present invention, will be described. First, on the heat sink 1, four smoothing capacitors 2 (group) and six switching elements 3 (group)
And three insulating supports 4 are attached. Secondly, a single board mounting the snubber circuit means and each current sensor by penetrating terminal bolts of each terminal (3a, 3b, 3c) of each switching element 3 so as to cover the switching element group. Is mounted on the terminal seat. Furthermore, each terminal 6 having a hollow cylindrical shape is inserted into a protruding terminal bolt penetrating the printed circuit board 5.

Third, three conductor bars 1 penetrated through each of the AC current sensors 10a on the printed circuit board 5, respectively.
1 are respectively attached and connected to three places of an AC terminal 6c and one insulating support 4 on two adjacent AC output terminals 3c. Then, via the insulating support 4, 3
The conductor bars 11 and the three AC wirings 21, 22, 23 are attached and connected.

Fourth, the negative terminal 2b of the smoothing capacitor 2 and the negative terminal 6b on the side of the negative terminal 3b of the switching element 3 are connected to each other by using the negative conductor plate 12 for connecting the negative electrodes of the smoothing capacitor 2 and the switching element 3. And connect. In the case of the present embodiment, the negative electrode terminal 2b and the negative electrode terminal 3b are arranged so as to face each other inward, and the distance connecting the negative electrodes is the shortest in the arrangement. The opposite arrangement in which the positive terminal is opposed to the inside may be possible.

Fifth, the four positioning holes 1 of the insulating plate 13
The flat portion of the insulating plate 13 is fixed to the negative conductor plate 1 while fitting and positioning the 3b with the mounting screws of the four negative terminals 2b.
2 so as to overlap the flat portion 12a. Sixth, the positive terminal 2a of the smoothing capacitor 2 and the positive terminal 6a on the positive terminal 3a side of the switching element 3 are mounted and connected on the insulating plate 13 using the positive conductor plate 14 for connecting the positive electrodes to each other.

Finally, it is constituted by an assembling structure in which the conductor bars on the positive electrode side and the negative electrode side connected to the DC power supply are attached to the conductor plates 12 and 14, respectively. The DC conductor bar passes through the DC current sensor 10b installed on either the positive electrode side or the negative electrode side. It goes without saying that the number of components described above is not limited to the number in the embodiment.

As described above, according to the present invention, as shown in FIG.
And the height dimension of the mounting screw parts of the negative electrode conductor plate 12 and the positive electrode conductor plate 14 on the smoothing capacitor side, and the approximate depth dimension is the size of the smoothing capacitor, the switching element, and the insulation. It is the size of the total value of the sizes of the portions where the support 4 is disposed. The approximate width (longitudinal dimension) of the large current conducting portion shown in FIG. 3 is the column width of the switching element group. And since each component is assembled by a stacking method, a control device which is easy to assemble, erroneous assembling is avoided, leads to downsizing of the large current carrying portion, and achieves the object is provided.

That is, the electric vehicle control device can be completed by assembling the components on the heat sink 1 in a stacking manner, and the snubber circuit components and the current sensor 10 contained inside the conductor plates 12 and 14 can be completed. Wiring work is greatly simplified by the mounted printed circuit board 5. In addition, the conductor plates 12 and 14 having a large surface area do not impair the inductance reduction effect and the heat radiation effect, and also reduce the number of processing and assembling steps, thereby providing a control device for an electric vehicle that leads to downsizing.

The electric vehicle control device having the above configuration is connected in the following circuit diagram. FIG. 5 is a circuit diagram showing the electrical connection of the electric vehicle control device of FIG. In this embodiment, six IGBTs (Insulated Gate) are used as the switching elements 3.
Bipolar Transistor) is used. Note that two semiconductor elements are built in the switching element 3. Then, from the state where the two semiconductor elements are simultaneously turned on due to a malfunction and the DC side is short-circuited, at the moment when the upstream side element is turned off, the wiring for large current (mainly the negative electrode conductor plate 12 and the positive electrode conductor plate 14) When there is no snubber circuit due to the electromagnetic energy stored in the inductance L, a voltage V _{CE of the} formula (1) is applied between the collector and the emitter of the upstream element.

V _CE = V + L (dI _C / dt) (Equation 1) where: V: power supply voltage, I _C : collector current, t: time, snubber circuit capacitor 7 is wiring inductance L
Absorbs the electromagnetic energy by the collector of the IGBT,
The application of a voltage higher than the emitter-to-emitter rated voltage V _CEA is prevented. Therefore, in order to reduce this electromagnetic energy = L · I _C ^2/2 has to be satisfied (the number 2).
^{_{L · I C 2/2 ≦}} C (V CEA 2 -V 2) / 2 ( equation 2) where, C; the capacitance of the capacitor 7, C is determined from the equation (3).

[0042] The ^{_{C ≧ L · I C 2 /}} (V CEA 2 -V 2) ( Equation 3) (Equation 3), by reducing the inductance L of the wiring, C is possible to reduce, by extension, the capacitor 7
Can be reduced in number or capacity.

Here, when the flat portion 12a of the negative conductor plate 12 and the flat portion 14a of the positive conductor plate 14 face each other in parallel (to face each other), the effect of reducing the inductance L is generally as follows.
The evaluation is made based on the magnitude of C _L obtained by Expression (4). When C _L is large, the effect of reducing the inductance L is large. That is, an increase in C _L can reduce the inductance L and reduce the C value of the equation (3).

C _L = ε · ε ₀ · A / G (Equation 4) Here, C _L ; capacitance when the flat portion faces each other, ε: dielectric constant of the dielectric, ε ₀ : dielectric of the vacuum Ratio, A: facing area of the flat portion, G: air gap of the flat portion, From the equation (4), when G becomes smaller or A becomes larger,
It can be seen that C _L increases. In other words, it sets so as to secure the facing area A and the air gap G becomes a predetermined C _L, without impairing the effect of reducing wiring inductance, to achieve assembling improvement and miniaturization of the electric vehicle control device It turns out that it is connected.

In this embodiment, the flat portions 12a and 14
By increasing the facing area A of a, the effect of reducing the wiring inductance L is made equal to or more than that of the conventional technique. The wiring inductance L, that is, C, is reduced to be equal to or more than that, the number or capacity of the capacitors 7 is reduced, and the size and cost are reduced.

In order to increase the facing area A, in the present embodiment, as described above, the outer shape of the insulating plate 13 is set at the end portion where the end portions overlap the negative conductor plate 12 and the positive conductor plate 14. In FIG. 7, a projecting portion 13a having a length that ensures a predetermined creepage distance protrudes from the outer periphery of the flat portion 12a. That is, the insulating plate 13 is formed so as to protrude from the entire outer peripheral end of the negative electrode conductive plate 12 to secure a predetermined creeping distance between the negative electrode conductive plate 12 and the positive electrode conductive plate 14.

By providing the overhang portion 13a, the facing area A of the flat portion 12a and the flat portion 14a can be increased, and the insulating plate 13 is placed on the negative conductor plate 12, and the positive conductor plate 14 is placed thereon. Just by overlapping, the creeping distance between the outer periphery of the negative electrode conductor plate 12 (flat portion 12a) and the positive electrode conductor plate 14 can be easily and reliably secured. Insulating plate 1
No. 3 has a shape that can be formed by only a single cutting process from an insulating plate material, so that expensive equipment such as an injection mold is not required, and the total manufacturing cost is reduced.

Next, the features of this embodiment will be described.
A flat portion 12a of the negative electrode conductor plate 12 and a flat portion 14a of the positive electrode conductor plate 14 having a large surface area and a cross-sectional area satisfying a current carrying capacity for a predetermined large current. The mounting feet 12b and the mounting feet 14b and 14e of the positive electrode conductor plate 14 are provided, and the facing area A and the air gap G that satisfy a predetermined wiring inductance reduction effect are set. Further, a printed circuit board 5 having a cross-sectional area satisfying a predetermined conduction capacity is mounted on the switching element 3 (group), and a hollow cylindrical terminal 6 is mounted on the printed circuit board 5. Mounting foot 1 for negative electrode conductor plate 12 and positive electrode conductor plate 14
By mounting the 2b and 14b, a space having the height dimension of the mounting feet 12b and 14b (that is, a dimension difference space) is formed on the switching element 3 (group), and the snubber circuit components are integrated into this space. A layout configuration for arranging the printed circuit boards 5 is now possible. Further, the current sensor 10, the relay connector 20 and the like can be mounted on the printed circuit board 5.
There is no need to dispose the current sensor 10 and the like outside the positive electrode conductor plate 14 and the smoothing capacitor 2, and the other wiring of the control device is also formed on the printed circuit board 5, thereby eliminating useless space. The occupied volume of the large current carrying part has been reduced.

As described above, the occupied volume of the large current conducting portion of the control device is determined by adding the width dimension determined by adding the short side dimensions of the switching element 3, the long side dimension of the switching element 3, the conductor bar 11 and the three-phase AC output wiring 21, 22, 23
The sum of the depth dimension determined by the sum of the dimension occupied by the diameter and the diameter dimension of the smoothing capacitor 2, the height dimension of the tall smoothing capacitor 2, and the thickness dimension of the laminated negative electrode conductor plate 12, positive electrode conductor plate 14, and insulating plate 13 And a volume of a substantially rectangular parallelepiped having a height dimension determined from By realizing an arrangement (layout) with a high component mounting density within the dimensional range of the main component as defined in each of the above dimensions, the electric vehicle control device can be downsized.

[0050]

According to the present invention, since a stacked assembly system which does not impair the inductance reduction effect is adopted and the component mounting density is increased, an electric power which is small, high quality, has good assemblability and leads to cost reduction. There is an effect that the vehicle control device can provide.

[Brief description of the drawings]

FIG. 1 is a side view showing an electric vehicle control device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the electric vehicle control device of FIG. 1;

FIG. 3 is a front view showing the electric vehicle control device of FIG. 2;

FIG. 4 is a partial bird's-eye view showing the vicinity of a smoothing capacitor of the electric vehicle control device of FIG. 2;

FIG. 5 is a circuit diagram showing an electrical connection of the electric vehicle control device of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat sink, 2 ... Smoothing capacitor, 2a ... Positive electrode terminal, 2b ... Negative electrode terminal, 2d ... Safety valve, 3 ... Switching element, 3a ... Positive electrode terminal, 3b ... Negative electrode terminal, 3c ... AC output terminal, 4 ... Insulation support, 5 ... Printed circuit board, 6 ... Terminal, 6a ... Positive electrode terminal, 6b ... Negative electrode terminal, 6c ... AC terminal, 7 ... Capacitor, 8 ... Diode, 9 ... Resistance, 10a, 10b ... Current sensor, 11
... conductor bar, 12 ... negative electrode conductor plate, 12a ... flat part, 12
b: mounting foot, 13: insulating plate, 13a: overhang, 13
b: positioning hole, 13c: notch, 14: positive electrode conductor plate,
14a: flat portion, 14b: mounting foot portion, 14c: insulating hole,
14d: visual recognition hole, 20: relay connector, 21, 22, 2
3. AC wiring

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masayoshi Tashiro 2520, Odaiba, Hitachinaka-shi, Ibaraki Prefecture Inside the Automotive Equipment Division of Hitachi, Ltd. (72) Inventor Shigeyuki Yoshihara 2477 Takaba, Hitachinaka-shi, Ibaraki Stock Company Hitachi Car Engineering Co., Ltd.

Claims (5)

[Claims] 1. A group of smoothing capacitors for smoothing a DC power supply, a group of parallel-connected switching elements for converting the smoothed DC power into an AC power, a snubber circuit means for protecting the switching elements, A current sensor for detecting control information from the power supply and the AC power supply, and lower and upper conductor plates for electrically connecting the smoothing capacitor group and the switching element group with an insulating plate interposed therebetween, on a heat sink. An electric vehicle control device mounted on the switching device group, wherein a dimension difference space is formed on the switching element group by setting a height dimension of the switching element group shorter than a height dimension of the smoothing capacitor group; A printed circuit board integrally including at least the snubber circuit means of the snubber circuit means or the current sensor in the difference space; A lower conductor plate, said insulating plate and, with said upper conductor plate, sequentially mounted to a electric vehicle control device being characterized in that the mounting. 2. The safety valve according to claim 1, wherein the placed insulating plate or the upper conductor plate visually recognizes the safety valve in a portion of each of the smoothing capacitors opposed to a protective safety valve provided on an upper surface of the smoothing capacitor. A control device for an electric vehicle, characterized in that the control device has a visible hole or a notch that can be used. 3. The insulating plate according to claim 1, wherein the insulating plate penetrates a mounting screw portion for mounting the lower conductor plate to the smoothing capacitor group, and contacts the mounting screw portion to position the insulating plate. A control device for an electric vehicle, comprising: 4. The device according to claim 1, wherein the insulating plate has a projection extending over the entire periphery of an end portion of the lower conductor plate and the upper conductor plate which are placed and face each other. A control device for an electric vehicle. 5. The switching element group according to claim 1, wherein the height dimension of the switching element group is a space dimension that allows the dimension difference space to include the height dimension of the current sensor.
A control device for an electric vehicle, wherein the height of the smoothing capacitor group is less than half the height.