JPH07245951A - Semiconductor stack - Google Patents

Abstract

PURPOSE:To lower wiring reactance together with the shortening of wiring length, and to reduce surge voltage at the time of operation by using a stacked conductor stacked through insulators while connecting a switching element and a capacitor to specified tabular conductors respectively by connecting means penetrated through the stacked conductor. CONSTITUTION:Each terminal of switching elements 1a-1f, 2a-2f and capacitors 3a, 3b is placed on approximately the same plane by cooling devices 4a, 4b, etc., and a stacked conductor 21 is mounted so as to cover these terminals. The stacked conductor 21 contains tabular conductors 17-20 formed in approximately the same size, insulating plates 12b-12d are interposed among these conductors respectively, and the insulating plate 12a is superposed on the surface of the first conductor 17 and the insulating plate 12e on the rear of the fourth conductor 20. Conductor collars welded to either one of the conductors 17-20 respectively, insulated from others and penetrated through the stacked conductor 21 are set up at places corresponding to each terminal, and the conductor collars are clamped to the terminals by terminal connecting bolts, thus bonding sections among the elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor stack used in a power conversion device in which a smoothing capacitor is connected between a converter and an inverter.

[0002]

2. Description of the Related Art In recent power converters, high-speed switching elements have been used, and high frequency pulse width modulation (PWM) control methods have been widely adopted. Those connected in parallel are used. Further, in the high frequency pulse width modulation control method, surge voltage is easily generated at the time of switching due to the reactance between the elements, the high speed switching elements are brought close to each other to reduce the reactance, and the connection circuit length is shortened. A smoothing capacitor is placed.

FIG. 4 is a circuit diagram showing the configuration of an uninterruptible power supply device which is a type of power conversion device. In the figure, an input terminal of a converter 103 is connected to an AC input terminal 101 via an input filter 102. The converter 103 has high-speed switching elements connected in a three-phase bridge, and turns on each switching element so that the power factor becomes 1.
By controlling the off state, alternating current is converted to direct current. A capacitor 104 for removing a DC ripple and a storage battery 105 as a backup at the time of power failure are connected to the output terminal of the converter 103.

The output terminal of the converter 103 is connected to the input terminal of the inverter 106, and the output terminal of the inverter 106 is connected to the AC output terminal 108 via the output filter 107. The inverter 106 is connected with high-speed switching elements in a three-phase bridge, and controls on / off of these switches to convert direct current to alternating current. Therefore, a sine wave AC voltage is generated at the AC output terminal 108.

FIG. 5 shows a circuit for one bridge of the above-mentioned power converter, in which the elements shown here are assembled as a semiconductor stack. This circuit includes semiconductor switching elements 1a to 1f and 2a to 2f, which are transistors, and capacitors 3a and 3b. Among them, the switching elements 1a to 1c are connected in parallel with each other, and the switching element 2a
2c are also connected in parallel to each other, and these parallel connection circuits are connected in series to form a parallel series connection circuit, which is a constituent element of the converter 103. Further, the switching elements 1d to 1f are connected in parallel with each other, and the switching elements 2d to 2f are also connected in parallel with each other.These parallel connection circuits are connected in series to form a parallel series connection circuit, and the inverter 106 It is a component. Then, the capacitors 3a and 3b are connected in parallel to form a component of the capacitor 104.

Here, switching elements connected in parallel
The positive electrode terminal C of 1a to 1c is connected to the positive electrode side DC conductor 5a and the negative electrode terminal E.
Are respectively connected to the AC conductors 6a. Further, the positive electrode terminal C of the switching elements 2a to 2c connected in parallel is connected to the AC conductor 6a, and the negative electrode terminal E is connected to the negative electrode side DC conductor 7a. The AC conductor 6a has an AC input terminal 13.

On the other hand, switching elements 1d connected in parallel
The positive electrode terminals of 1f are connected to the positive electrode side DC conductor 5b, and the negative electrode terminals are connected to the AC conductor 6b. The positive terminals of the switching elements 2d to 2f connected in parallel are connected to the AC conductor 6b.
The negative electrode terminals are connected to the negative electrode side DC conductors, respectively.
The AC conductor 6b has an AC output terminal 14.

The positive terminals of the capacitors 3a and 3b connected in parallel are connected to the capacitor connecting conductor 9a, and the negative terminals thereof are connected to the capacitor connecting conductor 9b. Further, the capacitor connecting conductor 9a, via the connecting conductor 8a,
It is connected to the positive electrode side DC conductor 5a and is also connected to the positive electrode side DC conductor 5b via the connecting conductor 8b. And
The connecting conductor 8b has a DC terminal 11 for connecting the positive terminal of the storage battery 105 (FIG. 4). Also, the capacitor connection conductor
9b is connected to the negative electrode side DC conductor 7a via the connecting conductor 8c, and is connected to the negative electrode side DC conductor via the connecting conductor 8d.
It is connected to 7b. The connecting conductor 8d is the storage battery 10
A DC terminal 10 for connecting the negative electrode terminal 5 (FIG. 4) is provided.

FIGS. 6A and 6B show the mounting state of a conventional semiconductor stack in which the above-mentioned circuit for one bridge is assembled. FIG. 6A is its plan view and FIG. 6B is its side view. In FIG. 6, the switching elements 1a to 1c and 2a to 2c are attached to the cooling device 4a, and the switching elements 1d to 1f and 2d to 2f are attached to the cooling device 4b. Capacitors 3a and 3b are arranged in the middle of these cooling devices, and switching elements 1a to
The terminals of 1f, 2a to 2f and capacitors 3a and 3b are located on substantially the same plane.

Therefore, the positive electrode terminals C of the switching elements 1a to 1c are connected to the positive electrode side DC conductor 5a formed in a narrow plate shape, and the negative electrode terminals E are connected to the AC conductor 6a formed in a wide plate shape. There is. Further, the positive electrode terminal C of the switching elements 2a to 2c is connected to the AC conductor 6a, and the negative electrode terminal E is connected to the negative electrode side DC conductor 7a formed in a narrow plate shape.
The AC conductor 6a has an AC input terminal 13 protruding toward one end.
Is equipped with.

On the other hand, the positive electrode terminals of the switching elements 1d to 1f are connected to the positive electrode side DC conductor 5b formed in a narrow plate shape, and the negative electrode terminals are connected to the AC conductor 6b formed in a wide plate shape. In addition, switching elements 2d to 2f connected in parallel
The positive electrode terminal is connected to the AC conductor 6b, and the negative electrode terminal is connected to the negative electrode side DC conductor formed in a narrow plate shape.
The AC conductor 6b has an AC output terminal 14 protruding toward one end.
Is equipped with.

The positive terminals of the capacitors 3a and 3b connected in parallel are connected to the strip-shaped capacitor connecting conductor 9a, and the negative terminals thereof are connected to the strip-shaped capacitor connecting conductor 9b. Further, the capacitor connecting conductor 9a is commonly connected to one ends of the strip-shaped connecting conductors 8a and 8b, and the connecting conductor 8a
The other end of is connected to the positive electrode side DC conductor 5a, and the other end of the connecting conductor 8b is connected to the positive electrode side DC conductor 5b. Connecting conductor
8b has a DC terminal 11. The capacitor connecting conductor 9b is commonly connected to one ends of the connecting conductors 8c and 8d, the other end of the connecting conductor 8c is a negative electrode side DC conductor 7a, and the other end of the connecting conductor 8d is a negative electrode side DC conductor 7b. Each is connected. The connecting conductor 8d has a DC terminal 10.

The semiconductor stack shown in FIG. 6 has a parallel connection circuit of switching elements 1a to 1f and a parallel connection circuit of switching elements 2a to 2f via a parallel connection circuit of capacitors 3a and 3b.
In the case of connecting to the parallel-series connection circuit, the connection circuit length is kept short to reduce the reactance, and the positive electrode side and the negative electrode side are symmetrical so that the reactance values are equal.

[0014]

The above-mentioned conventional semiconductor stack uses a narrow DC conductor, a wide AC conductor, a strip-shaped connecting conductor and a connecting conductor to significantly reduce the wiring reactance of the circuit. ing. However, even with this, the connection circuit length between the capacitor and the switching element is not sufficiently shortened, and there is a limit to the reduction of the reactance.Therefore, it is not sufficient to suppress the surge voltage during the switching operation of each element to a low level. there were.

The present invention has been made to solve the above problems, and provides a semiconductor stack capable of further reducing the wiring reactance of a circuit and significantly suppressing the surge voltage during the switching operation of each element. The purpose is to get.

[0016]

The invention according to claim 1 includes a switching element group and a capacitor whose terminals are arranged on the same plane, and the switching element group is divided into a positive electrode side and a negative electrode side. And a parallel connection circuit for connecting the negative electrodes to each other in series to a parallel connection circuit for connecting the positive electrodes, and forming first and second parallel series connection circuits connected in parallel to each other. In the semiconductor stack in which the positive electrode terminal of the capacitor is connected to the positive connection side of the connection circuit and the negative terminal of the capacitor is connected to the negative connection side, the first, second, third and fourth semiconductor stacks are provided.
The plate-shaped conductors are laminated via an insulator, and the laminated body penetrates the laminated conductor, which is arranged close to the terminal, and the positive electrode terminal of the switching element on the positive electrode side and the positive electrode terminal of the capacitor. A first connecting means for connecting to the first conductor in a state of being insulated from other conductors and a first conductor penetrating the laminated conductor,
And a second connecting means for connecting the negative electrode terminal of the positive electrode side switching element and the positive electrode terminal of the negative electrode side switching element forming a parallel series circuit to the second conductor while being insulated from other conductors, and a laminated conductor. And a negative electrode terminal of the switching element on the positive electrode side and a positive electrode terminal of the switching element on the negative electrode side, which form a second parallel series circuit, are connected to the third conductor while being insulated from other conductors. And a fourth connecting means which penetrates the laminated conductor and connects the positive electrode terminal of the switching element on the negative electrode side and the negative electrode terminal of the capacitor to the fourth conductor in a state of being insulated from other conductors.

According to a second aspect of the present invention, the second and third conductors are laminated with the first and fourth conductors in a state of being insulated from each other on the same plane.

According to a third aspect of the present invention, there is provided a single-phase power conversion device including two sets of first and second parallel series circuits and two sets of second and third conductors insulated from each other. It is what constitutes.

According to a fourth aspect of the present invention, there is provided a three-phase power conversion device including three sets of first and second parallel series circuits and three sets of second and third conductors insulated from each other. It is what constitutes.

[0020]

According to the first aspect of the invention, a laminated conductor in which the first to fourth plate-shaped conductors are laminated via an insulator is used, and the connecting means penetrating the laminated conductor is used,
For each set of terminals that should be connected to each other of the switching element and the capacitor, since they are connected to different plate conductors,
The wiring reactance can be reduced together with the shortening of the wiring length, whereby the surge voltage during the switching operation can be suppressed to a significantly low level.

According to the second aspect of the present invention, the second and third conductors are laminated with other conductors so that they are arranged side by side on a plane. Therefore, the area of the second and third conductors is half or less. Since one is used, the thickness and weight of the laminated conductor can be reduced.

In the invention described in claim 3 or 4,
Since the plurality of circuits forming the single-phase bridge circuit or the three-phase bridge circuit are connected to the common conductor, the overall configuration of the power conversion device can be simplified.

[0023]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows the configuration of an embodiment corresponding to the invention described in claim 1, (a) is a plan view thereof, and (b) is a side view thereof. In the figure, the same reference numerals as those in FIG. 6 indicate the same elements. In FIG. 1, the switching elements 1a to 1c and 2a to 2c constituting the converter are mounted on the cooling device 4a. In addition, the switching elements 1d to 1f and 2d to 2f forming the inverter are cooling devices.
Mounted on 4b. The condensers 3a and 3b are arranged between the cooling devices 4a and 4b. As a result, the switching elements 1a to 1f, 2a to 2f and the terminals of the capacitors 3a and 3b are located on substantially the same plane. A laminated conductor 21 is installed so as to cover these terminals. The laminated conductor 21 is a plate-shaped first conductor formed to have substantially the same size.
17, a second conductor 18, a third conductor 19 and a fourth conductor 20 are included, and insulating plates 12b, 12c and 12d are respectively interposed between these conductors.
And an insulating plate 12a on the surface of the first conductor 17,
The insulating plate 12e is overlapped on the back surface of the fourth conductor 20, and the fixing insulating bolts 16 collectively fasten the four places on the plane. The first conductor 17 has a DC terminal 11 on one side, and the fourth conductor 20 has a DC terminal 11 on the other side.
The second conductor 18 has an AC input terminal 13 at one end and the third conductor 19 has an AC output terminal 14 at the other end.

Here, at the positions corresponding to the terminals of the switching elements 1a to 1f and the capacitors 3a and 3b, as shown in FIG. A conductor collar 22 which is insulated from the conductor and penetrates the laminated conductor 21 is provided. And terminal connection bolt
By tightening the conductor collar to the terminal 23 with 15,
The elements are connected together. In particular, FIG. 2 shows a case where the positive terminals of the switching elements 1a to 1f and the positive terminals of the capacitors 3a and 3b are electrically connected via the first conductor 17. Therefore, the second conductor 18 and the third conductor
19, a conductor collar for the fourth conductor 20 and the insulating plates 12a to 12e
A hole having a diameter larger than the outer diameter of 22 is drilled. The conductor collar 22 and the terminal connecting bolt 15 correspond to the connecting means of the present invention.

Further, the negative terminal E of the switching elements 1a to 1c and the positive terminal C of the switching elements 2a to 2c are connected to the second conductor 18 by the same connecting means as shown in FIG. The negative terminal E of the switching elements 1d to 1f and the positive terminal C of the switching elements 2d to 2f are connected to the third conductor 19.

Furthermore, the negative terminals E of the switching elements 2a to 2f and the negative terminals of the capacitors 3a and 3b are connected to the fourth conductor 20 by the same connecting means as shown in FIG.

As a result, the same connection as described with reference to FIG. 6 is performed. Further, as compared with the configuration shown in FIG. 6, the capacitors 3a and 3b and the switching elements 1a to 1f,
The circuit length for connecting 2a to 2f can be significantly shortened, and the wiring reactance can be reduced.
Moreover, since the connection is completed by arranging the laminated conductor 21 on the terminals of the switching elements 1a to 1f and the capacitors 3a and 3b and tightening the terminal connection bolts 15, conductors of different types as described with reference to FIG. There is also an effect that the working time can be significantly shortened as compared with the case of sequentially assembling.

FIG. 3 shows the construction of an embodiment corresponding to the invention described in claim 2, (a) is a plan view thereof, and (b) is a side view thereof. In the figure, the same reference numerals as those in FIG. 1 denote the same elements. Then, as described with reference to FIG. 1, the switching elements 1a to 1c and 2a to 2c constituting the converter are mounted on the cooling device 4a. In addition, the switching element 1d ~
1f and 2d-2f are mounted on the cooling device 4b. The condensers 3a and 3b are arranged between the cooling devices 4a and 4b. As a result, the switching elements 1a to 1f, 2a to 2f and the terminals of the capacitors 3a and 3b are located on substantially the same plane. Then, the laminated conductor 41 is installed so as to cover these terminals. The laminated conductor 41 is a plate-shaped first conductor
17 and a second conductor 48, 49 having a length about half that of the first conductor 17, and a fourth conductor 20 having the same size as the first conductor 17 are laminated. is there. The second conductor 48 is located on the element forming the converter, the third conductor 49 is located on the element forming the inverter, and the first conductor 17 and the fourth conductor 20 are separated from each other. It is laminated in the form of being sandwiched between and
Places are tightened together. The second conductor 48
The AC input terminal 13 described above is formed on the third conductor 49.
An AC output terminal 14 is formed on the.

Further, the connection means shown in FIG.
The conductor 17 is electrically connected to the positive terminals of the switching elements 1a to 1f and the positive terminals of the capacitors 3a and 3b. Similarly, the negative terminal E of the switching elements 1a to 1c and the positive terminal C of the switching elements 2a to 2c are connected to the second conductor 48 on the second conductor 48, and the switching element is connected to the third conductor 49. Negative electrode terminal E of 1d to 1f and switching element 2d to
The 2f positive electrode terminal C is connected to the third conductor 19. Furthermore, the negative terminal E of the switching elements 2a to 2f and the negative terminals of the capacitors 3a and 3b are connected to the fourth conductor 20.

Also in this embodiment, the same connection as described with reference to FIG. 6 is performed. Further, as compared with the configuration shown in FIG. 6, the connection circuit length can be shortened, and moreover,
The wiring reactance can be reduced. In addition, position the laminated conductor 21 on the terminal of each element, and
Since the connection is completed by the operation of tightening, there is also an effect that the working time can be significantly shortened compared to the conventional one. Further, compared with the embodiment shown in FIG. 1, since the length of the second conductor 48 and the third conductor 49 is half or less, the overall shape and weight can be reduced.

In the above embodiment, the insulating conductors are superposed between the plate-shaped conductors to form an integrated laminated conductor.
Instead of using an independent insulating plate, for example, a conductor coated with an insulator may be laminated on the surface.

In the above embodiment, separate cooling devices are used for the converter side and the inverter side, but the present invention is not limited to this application, and a single cooling device is used for all switching devices. The present invention can be applied to a device using a larger number of cooling devices without mounting elements or distinguishing between the converter side and the inverter side.

Furthermore, in the above embodiment, the positive electrode terminal and the negative electrode terminal are led out in one direction for each switching element, but the negative electrode terminal of the positive electrode side switching element and the positive electrode terminal of the negative electrode side switching element are provided. Even when a 2-in-1 type switching element in which is connected and the common connection terminal is derived is used, the above-mentioned laminated conductor can be applied.

By the way, although the semiconductor stack for one bridge has been described in the above embodiment, the lateral width of the first conductor 17 and the fourth conductor 20 shown in FIG. By arranging two pieces in the direction and two pieces of the third conductor 49 in the horizontal direction, the elements for two bridges can be connected, and thus, a single-phase power conversion device for converting alternating current into alternating current can be provided. Can be configured.

Further, the first conductor 17 and the fourth conductor shown in FIG.
If the lateral width of the conductor 20 is expanded, three second conductors 48 are laterally arranged, and three third conductors 49 are laterally arranged, elements for three bridges can be connected. This makes it possible to configure a three-phase power conversion device that converts alternating current into alternating current.

As described above, even when the single-phase or three-phase power conversion device is used as a stack, it is possible to reduce the above-mentioned wiring reactance, work time, and overall shape and weight.

[0037]

As is apparent from the above description, according to the present invention, it is possible to reduce the wiring reactance of the circuit as compared with the conventional device, and thereby suppress the surge voltage during the switching operation to be remarkably low. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a plan view and a side view showing a configuration of an embodiment corresponding to the invention described in claim 1.

FIG. 2 is a partial sectional view showing details of the embodiment shown in FIG.

FIG. 3 is a plan view and a side view showing the configuration of an embodiment corresponding to the invention described in claim 2.

FIG. 4 is a circuit diagram showing a configuration of a general power converter.

5 is a circuit diagram showing a configuration for one phase of the power conversion device shown in FIG.

6A and 6B are a plan view and a side view showing a configuration of a conventional semiconductor stack.

[Explanation of symbols]

 1a-1f, 2a-2f Switching element 3a, 3b Capacitor 12a-12e Insulation plate 13 AC input terminal 14 AC output terminal 15 Terminal connection bolt 17 First conductor 18,48 Second conductor 19,49 Third conductor 20 Fourth conductor 21,41 Laminated conductor 22 Conductor collar 23 Terminal

Claims (4)

[Claims] 1. A terminal includes a switching element group and a capacitor each arranged on the same plane, the switching element group is divided into a positive electrode side and a negative electrode side, and a parallel connection circuit between the positive electrode side and a negative electrode side are connected to each other. Parallel connection circuits are connected in series to each other to form first and second parallel series connection circuits that are connected in parallel to each other, and the first and second parallel series connection circuits are connected to the positive side interconnection point of the first and second parallel series connection circuits. In a semiconductor stack in which a positive electrode terminal of a capacitor is connected to a negative electrode side of the negative electrode terminal of the capacitor, first, second, third and fourth plate-shaped conductors are laminated via an insulator. And a laminated conductor whose laminated body is arranged in the vicinity of the terminal, penetrates the laminated conductor, and connects the positive electrode terminal of the switching element on the positive electrode side and the positive electrode terminal of the capacitor from other conductors. A first connecting means for connecting to the first conductor in an edged state; a negative electrode terminal of the switching element on the positive electrode side that penetrates the laminated conductor and constitutes the first parallel series circuit; Second connecting means for connecting the positive electrode terminal of the switching element to the second conductor in a state of being insulated from other conductor; and a positive electrode side which penetrates the laminated conductor and constitutes the second parallel series circuit. Third connection means for connecting the negative electrode terminal of the switching element and the positive electrode terminal of the switching element on the negative electrode side to the third conductor in a state of being insulated from other conductors; 4. A fourth connecting means for connecting the positive terminal of the switching element and the negative terminal of the capacitor to the fourth conductor in a state of being insulated from other conductors, and a semiconductor stack comprising: 2. The semiconductor stack according to claim 1, wherein the second and third conductors are laminated with the first and fourth conductors in a state of being insulated from each other on the same plane. 3. Two sets of said first and second parallel series circuits,
3. The semiconductor stack according to claim 2, comprising a single-phase power conversion device including two sets of the second and third conductors that are insulated from each other. 4. Three sets of said first and second parallel series circuits,
3. The semiconductor stack according to claim 2, comprising a three-phase power conversion device including three sets of the second and third conductors insulated from each other.