JP2019180114A - Power conversion device and capacitor for power conversion device - Google Patents

Abstract

To facilitate a process for electrically connecting a first electrode side conductor connecting a semiconductor module and a capacitor, with a first electrode terminal of the capacitor, and electrically connecting a second electrode side conductor connecting the semiconductor module and the capacitor, with a second electrode terminal of the capacitor.SOLUTION: A power conversion device 1 comprises: a conductor set for connecting a semiconductor module 21 and a capacitor; and a loading section. The conductor set comprises a first electrode side conductor PI and a second electrode side conductor NI. The capacitor comprises: capacitor elements 23C1 and 23C3; first electrode terminals 23C1P to 3P; and second electrode terminals 23C1N to 3N, and a part of the first electrode terminals and the second electrode terminals is exposed to outside the capacitor. The first electrode side conductor and the second electrode side conductor are arranged between the capacitor and the loading section, and the first electrode side conductor is confronted with the first electrode terminal to be electrically connected, and the second electrode side conductor is confronted with the second electrode terminal to be electrically connected in a state where the capacitor is loaded.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a power converter and a capacitor for a power converter.

  2. Description of the Related Art Conventionally, there is known a semiconductor device that does not require a step of inverting a semiconductor element when arranging the semiconductor element (see, for example, Patent Document 1). In the semiconductor device described in Patent Document 1, a first semiconductor element (upper arm element) and a second semiconductor element (lower arm element) are arranged in parallel. Also, the thin plate portion of the conductor electrically connected to the electrode on the upper surface side of the first semiconductor element and the thin plate portion of the conductor electrically connected to the electrode on the lower surface side of the second semiconductor element are fixed. Thus, the electrode on the upper surface side of the first semiconductor element and the electrode on the lower surface side of the second semiconductor element are electrically connected.

JP 2012-235081 A

By the way, Patent Document 1 discloses that a positive-side conductor electrically connected to an electrode on a lower surface side of a first semiconductor element and a negative-electrode side conductor electrically connected to an electrode on an upper surface side of a second semiconductor element. In addition, there is no description about the process of electrically connecting the positive electrode terminal and the negative electrode terminal of the capacitor.
Therefore, in the semiconductor device described in Patent Document 1, the process of electrically connecting the positive electrode terminal and the negative electrode terminal of the capacitor to the positive electrode side conductor and the negative electrode side conductor of the semiconductor module may be complicated. is there.

  In view of the above-mentioned problems, the present invention electrically connects the first pole-side conductor of the semiconductor module and the first pole terminal of the capacitor, and the second pole-side conductor of the semiconductor module and the capacitor first An object of the present invention is to provide a power conversion device and a capacitor for a power conversion device that can simplify the process of electrically connecting the two-pole terminals.

(1) A power converter according to an aspect of the present invention includes a semiconductor module having an upper arm element and a lower arm element, a capacitor, a mounting portion on which the capacitor is mounted, the semiconductor module and the capacitor. A conductor set to be connected, and the conductor set includes a first pole side conductor and a second pole side conductor having a polarity different from that of the first pole side conductor, and the capacitor includes: A capacitor element; a first pole terminal having the same polarity as the first pole side conductor; and a second pole terminal having the same polarity as the second pole side conductor; At least a part of the second electrode terminal is exposed to the outside of the capacitor, and the first electrode conductor and the second electrode conductor are disposed between the capacitor and the mounting portion. The capacitor is mounted on the mounting part. In the mounted state, the first pole-side conductor is disposed at a position facing the first pole terminal, and the second pole-side conductor is opposed to the second pole terminal. A body is electrically connected to the first pole terminal, and the second pole-side conductor is electrically connected to the second pole terminal.

(2) In the power conversion device according to (1), the first pole-side conductor is disposed closer to the mounting portion than the first pole terminal between the capacitor and the mounting portion. The second electrode-side conductor may be disposed closer to the mounting portion than the second electrode terminal.

(3) In the power conversion device according to (1) or (2), the first pole terminal and the second pole terminal are arranged in parallel with each other with a predetermined distance therebetween, Between the capacitor and the mounting portion, the first pole-side conductor and the second pole-side conductor may be arranged in parallel with each other with a predetermined distance therebetween.

(4) In the power conversion device according to any one of (1) to (3), a conductive first retractable component is provided at a joint portion between the first pole-side conductor and the first pole terminal. An electrically conductive second contractible component may be disposed at a joint between the second electrode-side conductor and the second electrode terminal.

(5) In the power conversion device according to any one of (1) to (4), when the first pole-side conductor and the second pole-side conductor are viewed from the capacitor side, the first A part of the first pole side conductor is covered with the second pole side conductor, and a part of the first pole side conductor that is not covered with the second pole side conductor is the first pole side conductor. The second pole-side conductor facing the one-pole terminal and covering a part of the first pole-side conductor may face the second pole terminal.

(6) A capacitor for a power converter according to an aspect of the present invention includes at least a first capacitor element, a second capacitor element disposed adjacent to the first capacitor element, a first electrode terminal, and the first capacitor terminal. A second pole terminal having a polarity different from that of the first pole terminal, wherein the first capacitor element is disposed at a first body portion and one end of the first body portion, and the first extreme A plate-like first terminal portion having the same polarity as the child, disposed at the other end of the first body portion, having the same polarity as the second electrode terminal, and the first A plate-like second terminal portion parallel to the terminal portion, wherein the second capacitor element is disposed at one end of the second main body portion and the second main body portion, and the first pole terminal A plate-like third terminal portion having the same polarity as that of the second body portion and the other end portion of the second body portion, And a plate-like fourth terminal portion having the same polarity as the second pole terminal and parallel to the third terminal portion, wherein the first pole terminal includes the first terminal portion and the Arranged perpendicular to the third terminal part, the second pole terminal is arranged perpendicular to the second terminal part and the fourth terminal part, and is arranged adjacent to the first pole terminal, The second terminal portion and the third terminal portion are adjacent to each other and face each other, and the second terminal portion includes a protruding portion that is electrically connected to the second pole terminal, and the third terminal The portion includes a protruding portion electrically connected to the first electrode terminal, and the position of the protruding portion of the second terminal portion is shifted from the position of the protruding portion of the third terminal portion.

In the power conversion device according to (1) above, when the capacitor is mounted on the mounting portion, the first pole-side conductor connecting the semiconductor module and the capacitor faces the first pole terminal of the capacitor, and the semiconductor The second pole side conductor connecting the module and the capacitor faces the second pole terminal of the capacitor, the first pole side conductor is electrically connected to the first pole terminal of the capacitor, and the second pole side A conductor is electrically connected to the second pole terminal of the capacitor.
Therefore, in the power conversion device described in (1) above, the capacitor is mounted on the mounting portion, thereby electrically connecting the first pole-side conductor of the semiconductor module and the first pole terminal of the capacitor; and The second pole side conductor of the semiconductor module and the second pole terminal of the capacitor can be electrically connected.
That is, in the power conversion device described in (1) above, the electrical connection between the first pole-side conductor of the semiconductor module and the first pole terminal of the capacitor, and the second pole-side conductor and capacitor of the semiconductor module It is possible to facilitate electrical connection with the second electrode terminal.

In the power converter described in (2) above, the first pole-side conductor is disposed closer to the mounting portion than the first pole terminal between the capacitor and the mounting portion, and the second pole-side conductor is The second electrode terminal may be disposed closer to the mounting portion.
In such a configuration, the first pole-side conductor and the first pole terminal of the capacitor are electrically connected between the capacitor and the mounting portion, and the second pole-side conductor and the capacitor first are connected. A two-pole terminal can be electrically connected.

In the power conversion device according to (3) above, in a state where the capacitor is mounted on the mounting portion, the first pole terminal and the second pole terminal are arranged in a state parallel to each other with a predetermined distance therebetween, The first pole-side conductor and the second pole-side conductor may be arranged in parallel with each other with a predetermined distance therebetween.
In such a configuration, the first pole terminal and the second pole terminal are not arranged in parallel with each other with a predetermined distance therebetween, and the first pole side conductor and the second pole side conductor are The increase in the stray inductance in the power conversion circuit can be suppressed as compared with the case where they are not arranged in parallel with each other at a predetermined distance.

In the power conversion device described in (4) above, the conductive first retractable component is disposed at the joint between the first pole-side conductor and the first pole terminal, and the second pole-side conductor and the second extreme side A conductive second retractable part may be disposed at the joint with the child.
In such a case, the first pole-side conductor and the first pole-side conductor are absorbed by the first retractable part while the height variation of the first pole-side conductor or the first pole terminal is absorbed by the first retractable part. The first pole terminal can be electrically connected. Further, the second pole-side conductor and the second pole terminal are electrically connected to each other by the second retractable component while the height variation of the second pole-side conductor or the second pole terminal is absorbed by the second retractable component. Can be connected to.

In the power conversion device according to (5) above, when the first pole side conductor and the second pole side conductor are viewed from the capacitor side, a part of the first pole side conductor is the second pole side. It may be covered with a conductor.
In such a configuration, the power conversion device can be made smaller than when the first pole-side conductor and the second pole-side conductor are arranged at positions where they do not overlap each other.

In the capacitor for a power converter described in (6) above, the second terminal portion and the third terminal portion are adjacent and facing each other, and the second terminal portion is electrically connected to the second pole terminal. The position of the protruding portion is shifted from the position of the protruding portion of the third terminal portion that is electrically connected to the first pole terminal.
Therefore, in the capacitor | condenser for power converter devices of said (6), the 2nd terminal part and the 3rd terminal part are arrange | positioned adjacently, the protrusion part of a 2nd terminal part, and the protrusion part of a 3rd terminal part An insulation distance between the two can be ensured.

It is a figure which shows an example of schematic structure of the power converter device of 1st Embodiment. It is a perspective view of an example of the power converter of a 1st embodiment. It is an enlarged view of the power module in FIG. It is a vertical sectional view of the power converter along the BB line in Drawing 2 (B). FIG. 5 is a diagram for schematically explaining a configuration of a joint portion between a positive electrode side conductor and a positive electrode terminal and a joint portion between a negative electrode side conductor and a negative electrode terminal in FIG. 4. It is a figure for demonstrating the inside of the capacitor | condenser unit used for the power converter device shown in FIGS. It is a perspective view of a negative electrode terminal part and a positive electrode terminal part. FIG. 7 is a perspective view of the capacitor unit shown in FIG. 6. FIG. 7 is an exploded perspective view of the capacitor unit and the like shown in FIG. 6. It is a figure for demonstrating the assembly procedures, such as a capacitor | condenser unit shown in FIG. It is a figure which shows an example of a part of vehicle which can apply the power converter device of 1st to 3rd embodiment.

  Hereinafter, embodiments of a power converter and a capacitor for a power converter according to the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a diagram illustrating an example of a schematic configuration of a power conversion device 1 according to the first embodiment. Specifically, FIG. 1A is a front view of the power conversion device 1 in a state before the capacitor unit 23 is assembled to the mounting portion MP. FIG. 1B is a front view of the power conversion device 1 in a state after the capacitor unit 23 is assembled to the mounting portion MP. FIG. 1C is a schematic vertical sectional view of the power conversion device 1 along the line AA in FIG.
FIG. 2 is a perspective view of an example of the power conversion device 1 according to the first embodiment. Specifically, FIG. 2 is a perspective view of the power conversion device 1 viewed from the left front side and from the upper side. FIG. 2A is a perspective view of the power conversion device 1 corresponding to the state shown in FIG. FIG. 2B is a perspective view of the power conversion device 1 corresponding to the state shown in FIG.
FIG. 3 is an enlarged view of the power module 21 in FIG. FIG. 4 is a vertical cross-sectional view of the power conversion device 1 along the line BB in FIG. FIG. 5 is a diagram for schematically explaining the configuration of the junction between positive electrode side conductor PI and positive electrode terminal 50p and the junction between negative electrode side conductor NI and negative electrode terminal 50n in FIG.

In the example illustrated in FIGS. 1 to 5, the power conversion device 1 includes a power module (semiconductor module) 21, a capacitor unit 23, a mounting portion MP, a positive electrode side conductor PI, and a negative electrode side conductor NI. ing.
The power module (semiconductor module) 21 includes upper arm elements UH, VH, WH, S1 (see FIG. 11) and lower arm elements UL, VL, WL, S2 (see FIG. 11). The upper arm elements UH, VH, WH, S1 and the lower arm elements UL, VL, WL, S2 are switching elements such as IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal Oxide Semi-conductor Field Effect Transistor), etc. is there. Upper arm elements UH, VH, WH, S1 and lower arm elements UL, VL, WL, S2 are mounted on substrate SA (see FIG. 4). The lower surface electrodes (not shown) of the upper arm elements UH, VH, WH, S1 are electrically connected to the positive electrode side conductor PI. Upper surface electrodes (not shown) of the lower arm elements UL, VL, WL, and S2 are electrically connected to the negative electrode side conductor NI. Upper side electrodes (not shown) of upper arm elements UH, VH, WH and lower side electrodes (not shown) of lower arm elements UL, VL, WL are output-side conductors 51, 52 (see FIGS. 3 and 4). Is electrically connected. A gate signal line GS (see FIGS. 3 and 4) is connected to the gate electrodes (not shown) of the upper arm elements UH, VH, WH, S1 and the lower arm elements UL, VL, WL, S2.

In the example shown in FIGS. 2 to 4, the power module 21 includes a first power conversion circuit unit 31, a second power conversion circuit unit 32, and a third power conversion circuit unit 33.
The first power conversion circuit unit 31 converts, for example, DC power input from the battery 11 (see FIG. 11) via the third power conversion circuit unit 33 into three-phase AC power, for example, the first motor 12 (FIG. 11). Supply). The first power conversion circuit unit 31 includes a U-phase upper arm portion Hi (see FIG. 3) having an upper arm element UH, a U-phase lower arm portion Lo (see FIG. 3) having a lower arm element UL, V-phase upper arm portion Hi having arm element VH, V-phase lower arm portion Lo having lower arm element VL, W-phase upper arm portion Hi having upper arm element WH, and lower arm element WL W-phase lower arm portion Lo.
The second power conversion circuit unit 32 converts, for example, three-phase AC power input from the second motor 13 (see FIG. 11) into DC power. The DC power converted by the second power conversion circuit unit 32 can be supplied to at least one of the battery 11 and the first power conversion circuit unit 31. The second power conversion circuit unit 32 includes a U-phase upper arm portion Hi having an upper arm element UH, a U-phase lower arm portion Lo having a lower arm element UL, and a V-phase upper arm having an upper arm element VH. A portion Hi, a V-phase lower arm portion Lo having a lower arm element VL, a W-phase upper arm portion Hi having an upper arm element WH, and a W-phase lower arm portion Lo having a lower arm element WL. ing.
The third power conversion circuit unit 33 is a voltage control unit (VCU). The third power conversion circuit unit 33 includes an upper arm portion Hi having an upper arm element S1 and a lower arm portion Lo having a lower arm element S2.

In the example shown in FIGS. 1 to 4, the power module 21 includes a module case CS and a heat radiating portion WJ.
The board SA on which the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL are mounted is accommodated in the module case CS. The substrate SA is connected to the heat radiating portion WJ (see FIGS. 1 and 4).
On the substrate SA, the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL are mounted. In addition, the upper arm element S1 and the lower arm element S2 of the third power conversion circuit unit 33 are mounted on the substrate SA.

In the example shown in FIGS. 2 and 3, the module case CS is mounted on the mounting portion MP1 (see FIG. 1 (A) and FIG. 1 (B)), for example, by a bolt (not shown). And (see FIG. 1B)).
In another example, the module case CS may be mounted (fixed) on the mounting position MP1 of the mounting portion MP by any known method such as caulking.

  In the example shown in FIGS. 2A and 4, the capacitor unit 23 includes capacitor elements 23C1, 23C2, and 23C3 (see FIG. 6 and the like for the capacitor elements 23C2 and 23C3) and a capacitor that houses the capacitor elements 23C1, 23C2, and 23C3. A case (upper case) 23A and a capacitor case (lower case) 23B, a potting material 23D injected into the capacitor cases 23A and 23B, and a flange portion 23E are provided. The capacitor case 23B includes a positive terminal 50p and a negative terminal 50n that are electrically insulated from each other by an electrical insulating layer (see FIG. 5).

In the example shown in FIGS. 4 and 5, a part of the positive terminal 50 p of the capacitor unit 23 (connection portion 50 p 1) is exposed to the outside of the capacitor unit 23. That is, the connection part 50p1 of the positive electrode terminal 50p of the capacitor unit 23 is exposed so as to be accessible from the lower side of FIGS.
Similarly, a part of the negative electrode terminal 50n of the capacitor unit 23 (connection portion 50n1) is exposed to the outside of the capacitor unit 23. That is, the connection part 50n1 of the negative electrode terminal 50n of the capacitor unit 23 is exposed so as to be accessible from the lower side of FIGS.

In the example shown in FIGS. 1 to 5, the capacitor unit 23 is mounted on the mounting position MP2 (see FIG. 1A) of the mounting portion MP (see FIGS. 1A and 1B), for example, by a bolt BT (see FIG. 1). ) And FIG. 1B)).
In another example, the capacitor unit 23 may be mounted (fixed) on the mounting position MP2 of the mounting portion MP by any known method such as caulking.

In the example shown in FIGS. 2A and 4, the positive electrode side conductor PI electrically connected to the lower surface electrodes of the upper arm elements UH, VH, and WH (see FIG. 11) of the second power conversion circuit unit 32 is provided. The capacitor unit 23 is extended to a lower position (specifically, a position facing the connection portion 50p1 of the positive terminal 50p of the capacitor unit 23). The negative electrode side conductor NI electrically connected to the upper surface electrodes of the lower arm elements UL, VL, WL (see FIG. 11) of the second power conversion circuit unit 32 is electrically insulated from the positive electrode side conductor PI. In this state, it extends to a lower position of the capacitor unit 23 (specifically, a position facing the connection portion 50n1 of the negative electrode terminal 50n of the capacitor unit 23). The positive electrode side conductor PI and the negative electrode side conductor NI connected to the second power conversion circuit unit 32 constitute a conductor set that connects the second power conversion circuit unit 32 of the power module 21 and the capacitor unit 23.
Similarly, in the example shown in FIG. 2A, the positive electrode-side conductor PI electrically connected to the lower surface electrodes of the upper arm elements UH, VH, and WH (see FIG. 11) of the first power conversion circuit unit 31 is provided. The capacitor unit 23 is extended to a lower position (specifically, a position facing the connection portion 50p1 of the positive terminal 50p of the capacitor unit 23). The negative electrode side conductor NI electrically connected to the upper surface electrodes of the lower arm elements UL, VL, WL (see FIG. 11) of the first power conversion circuit unit 31 is electrically insulated from the positive electrode side conductor PI. In this state, it extends to a lower position of the capacitor unit 23 (specifically, a position facing the connection portion 50n1 of the negative electrode terminal 50n of the capacitor unit 23). The positive electrode side conductor PI and the negative electrode side conductor NI connected to the first power conversion circuit unit 31 constitute a conductor set that connects the first power conversion circuit unit 31 of the power module 21 and the capacitor unit 23.
In the example shown in FIG. 2A, the positive electrode-side conductor PI electrically connected to the lower surface electrode of the upper arm element S1 (see FIG. 11) of the third power conversion circuit unit 33 is connected to the capacitor unit 23. It extends to a lower position (specifically, a position facing the connection portion 50p1 of the positive terminal 50p of the capacitor unit 23). The negative electrode side conductor NI electrically connected to the upper surface electrode of the lower arm element S2 (see FIG. 11) of the third power conversion circuit unit 33 is in a state where electric insulation is performed on the positive electrode side conductor PI. It extends to a lower position of the unit 23 (specifically, a position facing the connection portion 50n1 of the negative electrode terminal 50n of the capacitor unit 23). The positive electrode side conductor PI and the negative electrode side conductor NI connected to the third power conversion circuit unit 33 constitute a conductor set that connects the third power conversion circuit unit 33 of the power module 21 and the capacitor unit 23.

In the example shown in FIGS. 1 to 5, the capacitor unit 23 side of the positive electrode side conductor PI and the negative electrode side conductor NI connected to the second power conversion circuit unit 32 (FIGS. 1A and 1B). 4 and FIG. 5 is disposed between the capacitor unit 23 and the mounting portion MP (see FIGS. 1A and 1B).
Next, as shown in FIGS. 1A and 1B, the capacitor unit 23 is mounted on the mounting portion MP.
In a state where the capacitor unit 23 is mounted on the mounting portion MP, as shown in FIGS. 4 and 5, the end portion of the positive electrode side conductor PI connected to the second power conversion circuit portion 32 is connected to the positive electrode of the capacitor unit 23. It faces the connection part 50p1 of the terminal 50p. The end portion of the negative electrode-side conductor NI connected to the second power conversion circuit unit 32 faces the connection portion 50n1 of the negative electrode terminal 50n of the capacitor unit 23.
Specifically, in the example illustrated in FIGS. 1 to 5, the capacitor unit 23 is mounted on the mounting unit MP, so that the positive electrode side conductor PI connected to the second power conversion circuit unit 32 is connected to the capacitor unit 23. The negative electrode side conductor NI that is electrically connected to the positive electrode terminal 50p and connected to the second power conversion circuit unit 32 is electrically connected to the negative electrode terminal 50n of the capacitor unit 23.

In the example shown in FIGS. 1 to 5, in order to realize an electrical connection between the positive electrode side conductor PI connected to the second power conversion circuit unit 32 and the positive electrode terminal 50 p of the capacitor unit 23, for example, a coil spring or the like Such a conductive contractible component SP1 is used. Specifically, as shown in FIGS. 2A and 3, the retractable component SP1 is connected to the second power conversion circuit unit 32 before the capacitor unit 23 is mounted on the mounting unit MP. It arrange | positions on the edge part (joining part) of the positive electrode side conductor PI.
Moreover, in the example shown in FIGS. 1-5, in order to implement | achieve the electrical connection with the negative electrode side conductor NI connected to the 2nd power converter circuit part 32, and the negative electrode terminal 50n of the capacitor | condenser unit 23, for example, a coil A conductive contractible part SP2 such as a spring is used. Specifically, as shown in FIGS. 2A and 3, the retractable component SP <b> 2 is connected to the second power conversion circuit unit 32 before the capacitor unit 23 is mounted on the mounting unit MP. It arrange | positions on the edge part (joining part) of the negative electrode side conductor NI.

Moreover, in the example shown in FIGS. 1-5, the positive electrode side conductor PI and the negative electrode side conductor NI which were connected to the 1st power converter circuit part 31 in the step before the capacitor | condenser unit 23 is mounted in mounting part MP. The end of the capacitor unit 23 side (upper right side in FIG. 2A) is disposed between the capacitor unit 23 and the mounting portion MP (see FIGS. 1A and 1B). Further, as shown in FIG. 3, the retractable component SP1 is disposed on the end (junction) of the positive electrode side conductor PI connected to the first power conversion circuit unit 31, and the retractable component SP2 is It is disposed on the end (junction) of the negative electrode side conductor NI connected to the first power conversion circuit unit 31.
Next, in a state where the capacitor unit 23 is mounted on the mounting portion MP, the end portion of the positive electrode side conductor PI connected to the first power conversion circuit portion 31 faces the connection portion 50p1 of the positive electrode terminal 50p of the capacitor unit 23. The end portion of the negative electrode side conductor NI connected to the first power conversion circuit unit 31 faces the connection portion 50n1 of the negative electrode terminal 50n of the capacitor unit 23.
Specifically, by mounting the capacitor unit 23 on the mounting unit MP, the positive electrode side conductor PI connected to the first power conversion circuit unit 31 is connected to the positive terminal 50p of the capacitor unit 23 via the retractable component SP1. And the negative electrode side conductor NI connected to the first power conversion circuit unit 31 is electrically connected to the negative electrode terminal 50n of the capacitor unit 23 via the retractable component SP2.

Similarly, in the example illustrated in FIGS. 1 to 5, the positive electrode side conductor PI and the negative electrode side conductor connected to the third power conversion circuit unit 33 before the capacitor unit 23 is mounted on the mounting unit MP. The end of the NI capacitor unit 23 side (upper right side in FIG. 2A) is disposed between the capacitor unit 23 and the mounting portion MP (see FIGS. 1A and 1B). . Further, as shown in FIG. 3, the retractable component SP1 is disposed on the end (junction) of the positive electrode side conductor PI connected to the third power conversion circuit unit 33, and the retractable component SP2 is It is disposed on the end (junction) of the negative electrode-side conductor NI connected to the third power conversion circuit unit 33.
Next, in a state where the capacitor unit 23 is mounted on the mounting portion MP, the end portion of the positive electrode side conductor PI connected to the third power conversion circuit portion 33 faces the connection portion 50p1 of the positive electrode terminal 50p of the capacitor unit 23. The end portion of the negative electrode side conductor NI connected to the third power conversion circuit unit 33 faces the connection portion 50n1 of the negative electrode terminal 50n of the capacitor unit 23.
Specifically, by mounting the capacitor unit 23 on the mounting unit MP, the positive electrode side conductor PI connected to the third power conversion circuit unit 33 is connected to the positive terminal 50p of the capacitor unit 23 via the retractable component SP1. And the negative electrode side conductor NI connected to the third power conversion circuit unit 33 is electrically connected to the negative electrode terminal 50n of the capacitor unit 23 via the retractable component SP2.

As described above, in the power conversion device 1 of the first embodiment, when the capacitor unit 23 is mounted on the mounting portion MP, the positive-side conductor PI connected to the power module 21 is connected to the positive terminal 50p of the capacitor unit 23. The negative electrode side conductor NI facing the power module 21 faces the negative electrode terminal 50n of the capacitor unit 23, the positive electrode side conductor PI is electrically connected to the positive electrode terminal 50p of the capacitor unit 23, and The negative electrode side conductor NI is electrically connected to the negative electrode terminal 50 n of the capacitor unit 23.
Therefore, in the power conversion device 1 of the first embodiment, the capacitor unit 23 is mounted on the mounting portion MP, so that the positive electrode side conductor PI connected to the power module 21 and the positive electrode terminal 50p of the capacitor unit 23 are electrically connected. The negative electrode side conductor NI connected to the power module 21 and the negative electrode terminal 50n of the capacitor unit 23 can be electrically connected.
That is, in the power conversion device 1 of the first embodiment, the electrical connection between the positive electrode side conductor PI connected to the power module 21 and the positive electrode terminal 50p of the capacitor unit 23, and the negative electrode connected to the power module 21 The electrical connection between the side conductor NI and the negative electrode terminal 50n of the capacitor unit 23 can be facilitated.

As shown in FIGS. 4 and 5, between the capacitor unit 23 and the mounting portion MP (see FIGS. 1A and 1B), the positive-side conductive connected to the second power conversion circuit portion 32. The body PI is disposed closer to the mounting portion MP than the positive terminal 50p of the capacitor unit 23 (the lower side of FIGS. 4 and 5), and the negative electrode side conductor NI connected to the second power conversion circuit unit 32 is The capacitor unit 23 is disposed closer to the mounting portion MP than the negative electrode terminal 50n (lower side in FIGS. 4 and 5).
Similarly, in the example illustrated in FIGS. 1 to 5, the positive electrode-side conductor PI connected to the first power conversion circuit unit 31 is connected to the positive terminal 50 p of the capacitor unit 23 between the capacitor unit 23 and the mounting unit MP. The negative electrode side conductor NI disposed on the mounting portion MP side (lower side in FIG. 2A) and connected to the first power conversion circuit unit 31 is mounted on the mounting unit rather than the negative electrode terminal 50n of the capacitor unit 23. It is arranged on the MP side (the lower side in FIG. 2A).
Moreover, in the example shown in FIGS. 1-5, the positive electrode side conductor PI connected to the 3rd power converter circuit part 33 between the capacitor | condenser unit 23 and mounting part MP is from the positive electrode terminal 50p of the capacitor | condenser unit 23. Is disposed on the side of the mounting portion MP (lower side of FIG. 2A), and the negative electrode side conductor NI connected to the third power conversion circuit portion 33 is mounted on the mounting portion MP rather than the negative electrode terminal 50n of the capacitor unit 23. (The lower side in FIG. 2A).
Therefore, in the example shown in FIGS. 1 to 5, the positive electrode side conductor PI and the positive electrode terminal 50 p of the capacitor unit 23 are electrically connected between the capacitor unit 23 and the mounting portion MP (that is, immediately below the capacitor unit 23). The negative electrode side conductor NI and the negative electrode terminal 50n of the capacitor unit 23 can be electrically connected. That is, in the example shown in FIGS. 1 to 5, the electrical connection between the positive electrode side conductor PI and the positive electrode terminal 50 p of the capacitor unit 23 and the negative electrode side conductor NI and the capacitor unit 23 at a place other than directly below the capacitor unit 23. Compared with the case where electrical connection with the negative electrode terminal 50n is performed, the overall width direction dimension of the power conversion device 1 (the lateral dimension in FIGS. 4 and 5) can be reduced.

As shown in FIG. 2 (A), FIG. 4 and FIG. 5, a positive terminal 50p and a negative terminal 50n joined to each other through an electrical insulating layer (see FIG. 5) such as a laminate film are predetermined. They are spaced apart and are arranged in parallel to each other. Further, between the capacitor unit 23 and the mounting portion MP (see FIGS. 1A and 1B) (that is, immediately below the capacitor unit 23), the first power conversion circuit unit 31 and the second power conversion are performed. The positive electrode side conductor PI and the negative electrode side conductor NI connected to each of the circuit unit 32 and the third power conversion circuit unit 33 are arranged in parallel with each other with a predetermined distance therebetween.
As a result, in the example shown in FIGS. 1 to 5, when the capacitor unit 23 is mounted on the mounting portion MP, the positive electrode terminal 50p, the negative electrode terminal 50n, the positive electrode side conductor PI, and the negative electrode side conductor NI are 23 and the mounting portion MP (that is, directly below the capacitor unit 23), the state is spread so as to be a parallel plate. That is, the electrical connection portion between the positive electrode terminal 50p and the positive electrode side conductor PI and the electrical connection portion between the negative electrode terminal 50n and the negative electrode side conductor NI are spread so as to be parallel plates.
Therefore, in the example illustrated in FIGS. 1 to 5, the positive electrode terminal 50p, the negative electrode terminal 50n, the positive electrode side conductor PI, and the negative electrode side conductor NI are parallel plates between the capacitor unit 23 and the mounting portion MP. The increase in stray inductance in the power conversion circuit can be suppressed as compared with the case where the power conversion circuit does not spread.

As described above, in the example shown in FIGS. 1 to 5, the positive electrode side conductor PI (see FIGS. 3 and 5) and the positive electrode terminal 50p of the capacitor unit 23 (see FIGS. 2A and 5) are joined. A conductive contractible part SP1 (see FIGS. 3 and 5) is arranged in the section. At the junction between the negative electrode side conductor NI (see FIGS. 3 and 5) and the negative electrode terminal 50n (see FIGS. 2A and 5) of the capacitor unit 23, the conductive contractible component SP2 (see FIGS. 3 and 5). (See FIG. 5).
Therefore, in the examples shown in FIGS. 1 to 5, the variation in the height (the vertical position in FIG. 5) of the positive electrode side conductor PI or the positive electrode terminal 50p of the capacitor unit 23 is absorbed by the contractible component SP1. The positive-side conductor PI and the positive terminal 50p of the capacitor unit 23 can be electrically connected by the contracted component SP1. Further, while the variation in the height (position in the vertical direction in FIG. 5) of the negative electrode side NI or the negative electrode terminal 50n of the capacitor unit 23 is absorbed by the retractable component SP2, the contractible component SP2 and the negative electrode side conductor NI The negative electrode terminal 50n of the capacitor unit 23 can be electrically connected.

As shown in FIGS. 2A and 3, the positive electrode side conductor PI and the negative electrode side connected to the first power conversion circuit unit 31, the second power conversion circuit unit 32, and the third power conversion circuit unit 33, respectively. When the conductor NI is viewed from the capacitor unit 23 side (the upper side in FIG. 2A and FIG. 3), a part of the positive electrode side conductor PI (the lower left part in FIG. 2A and FIG. 3) Is covered with a negative electrode side conductor NI shorter than the positive electrode side conductor PI.
As shown in FIG. 2A, the portion of the positive electrode side conductor PI that is not covered by the negative electrode side conductor NI (the upper right side portion of FIG. 2A) is the positive electrode terminal 50p of the capacitor unit 23. Facing each other. The negative electrode side conductor NI covering a part of the positive electrode side conductor PI faces the negative electrode terminal 50 n of the capacitor unit 23.
Therefore, in the example shown in FIGS. 2A and 3, the positive electrode side conductor PI and the negative electrode side conductor NI connected to the first power conversion circuit unit 31 do not overlap with each other. 2A and 3B without any overlap between the positive electrode side conductor PI and the negative electrode side conductor NI that are arranged in the upper left-lower right direction and connected to the second power conversion circuit unit 32. When the positive electrode side conductor PI and the negative electrode side conductor NI that are arranged in the direction and connected to the third power conversion circuit unit 33 are arranged in the upper left-lower right direction of FIG. Rather, the overall depth direction dimension of the power conversion device 1 (the upper left-lower right dimension in FIG. 2A and FIG. 3) can be reduced.

FIG. 6 is a diagram for explaining the inside of the capacitor unit 23 used in the power conversion apparatus 1 shown in FIGS. Specifically, FIG. 6A is a plan view of the capacitor unit 23 seen through the capacitor case (upper case) 23A and the potting material 23D. FIG. 6B is a left side view of the capacitor unit 23 seen through the capacitor case 23A and the potting material 23D. FIG. 6C is a bottom view of the capacitor unit 23 seen through the capacitor case 23A and the potting material 23D. FIG. 6D is an enlarged view of a Z portion in FIG.
FIG. 7 is a perspective view of the negative terminal portion 23C1N and the positive terminal portion 23C2P. Specifically, FIG. 7 is a perspective view of the negative electrode terminal portion 23C1N and the positive electrode terminal portion 23C2P viewed from the left front side and the upper side of the capacitor unit 23.

FIG. 8 is a perspective view of the capacitor unit 23 shown in FIG. Specifically, FIG. 8A is a perspective view of the capacitor unit 23 viewed from the left front side and the upper side. FIG. 8B is a perspective view of the capacitor unit 23 in a state where the upper left front portion of the capacitor unit 23 shown in FIG. 8A is turned over so as to be positioned at the lower left rear portion.
FIG. 9 is an exploded perspective view of the capacitor unit 23 and the like shown in FIG. Specifically, FIG. 9 is an exploded perspective view of the capacitor unit 23 and the like as seen from the left front side and the upper side of the power conversion device 1.
FIG. 10 is a view for explaining an assembly procedure of the capacitor unit 23 and the like shown in FIG.

  In the example shown in FIGS. 6 to 10, the capacitor unit 23 includes three capacitor elements 23C1, 23C2, and 23C3. The capacitor element 23C1 and the capacitor element 23C2 are disposed adjacent to each other, and the capacitor element 23C2 and the capacitor element 23C3 are disposed adjacent to each other.

As shown in FIGS. 6, 8, and 9, the capacitor element 23C1 includes a main body portion 23C1A, a plate-like positive electrode terminal portion 23C1P, and a plate-like negative electrode terminal portion 23C1N.
The positive terminal portion 23C1P is disposed at the end of one of the main body portions 23C1A (the right side in FIGS. 6A and 6B, the lower right front side in FIGS. 8A and 9).
As shown in FIG. 9, the positive electrode terminal portion 23C1P includes, for example, four projecting portions 23C1P1. The protrusion 23C1P1 is fitted into the connection hole 50p21 of the positive electrode terminal 50p without being in contact with the negative electrode terminal 50n. The positive terminal portion 23C1P is electrically connected to the positive terminal 50p without being electrically connected to the negative terminal 50n. As a result, the polarity of the positive terminal 23C1P is the same as the polarity of the positive terminal 50p.
As shown in FIGS. 6 and 9, the negative electrode terminal portion 23C1N is on the other side of the main body portion 23C1A (the left side in FIGS. 6A and 6B, the upper left rear side in FIGS. 8A and 9). It is arranged at the end. Further, the negative terminal portion 23C1N is disposed in parallel with the positive terminal portion 23C1P.
As shown in FIGS. 7 and 9, the negative terminal portion 23C1N includes, for example, four projecting portions 23C1N1. As shown in FIG. 9, the protrusion 23C1N1 is fitted into the connection hole 50n21 of the negative electrode terminal 50n and does not contact the positive electrode terminal 50p. The negative terminal portion 23C1N is electrically connected to the negative terminal 50n without being electrically connected to the positive terminal 50p. As a result, the polarity of the negative electrode terminal portion 23C1N is the same as the polarity of the negative electrode terminal 50n.

As shown in FIGS. 6, 8, and 9, the capacitor element 23C2 includes a main body portion 23C2A, a plate-like positive electrode terminal portion 23C2P, and a plate-like negative electrode terminal portion 23C2N.
As shown in FIG. 6, the positive electrode terminal portion 23C2P is disposed at one end of the main body portion 23C2A (on the right side of FIGS. 6A and 6B).
As shown in FIG. 7, the positive terminal portion 23C2P includes, for example, four projecting portions 23C2P1. The protrusion 23C2P1 is fitted into the connection hole 50p22 (see FIGS. 9 and 10A) of the positive electrode terminal 50p without contacting the negative electrode terminal 50n. The positive terminal portion 23C2P is electrically connected to the positive terminal 50p without being electrically connected to the negative terminal 50n. As a result, the polarity of the positive terminal 23C2P is the same as the polarity of the positive terminal 50p.
As shown in FIGS. 6 and 9, the negative terminal portion 23C2N is disposed at the other end of the main body 23C2A (the left side in FIGS. 6A and 6B, the upper left rear side in FIG. 9). Yes. Further, the negative electrode terminal portion 23C2N is disposed in parallel with the positive electrode terminal portion 23C2P.
As shown in FIG. 9, the negative electrode terminal portion 23C2N includes, for example, four projecting portions 23C2N1. The protrusion 23C2N1 is fitted into the connection hole 50n22 of the negative electrode terminal 50n and does not contact the positive electrode terminal 50p. The negative terminal portion 23C2N is electrically connected to the negative terminal 50n without being electrically connected to the positive terminal 50p. As a result, the polarity of the negative electrode terminal portion 23C2N is the same as the polarity of the negative electrode terminal 50n.

As shown in FIGS. 6, 8, and 9, the capacitor element 23C3 includes a main body portion 23C3A, a plate-like positive electrode terminal portion 23C3P, and a plate-like negative electrode terminal portion 23C3N.
As shown in FIG. 6, the positive terminal portion 23C3P is disposed at one end (the right side of FIGS. 6A and 6B) of the main body 23C3A.
Similarly to the positive electrode terminal portion 23C1P, the positive electrode terminal portion 23C3P includes, for example, four protrusions 23C3P1 (see FIGS. 6C and 8B). The protrusion 23C3P1 is fitted into the connection hole 50p23 (see FIGS. 9 and 10A) of the positive terminal 50p without contacting the negative terminal 50n. The positive terminal portion 23C3P is electrically connected to the positive terminal 50p without being electrically connected to the negative terminal 50n. As a result, the polarity of the positive electrode terminal portion 23C3P is the same as the polarity of the positive electrode terminal 50p.
As shown in FIGS. 6 and 9, the negative terminal portion 23C3N is disposed at the other end of the main body 23C3A (the left side in FIGS. 6A and 6B, the upper left rear side in FIG. 9). Yes. Further, the negative terminal portion 23C3N is disposed in parallel with the positive terminal portion 23C3P.
As shown in FIG. 9, the negative electrode terminal portion 23C3N includes, for example, four projecting portions 23C3N1. The protrusion 23C3N1 is fitted into the connection hole 50n23 of the negative electrode terminal 50n and does not contact the positive electrode terminal 50p. The negative terminal portion 23C3N is electrically connected to the negative terminal 50n without being electrically connected to the positive terminal 50p. As a result, the polarity of the negative electrode terminal portion 23C3N is the same as the polarity of the negative electrode terminal 50n.

  As shown in FIGS. 6B and 9, the positive terminal 50p is disposed orthogonal to the positive terminal portions 23C1P, 23C2P, and 23C3P. The negative electrode terminal 50n is disposed orthogonal to the negative electrode terminal portions 23C1N, 23C2N, and 23C3N. The negative terminal 50n is disposed adjacent to the positive terminal 50p. Specifically, an electrical insulating layer (see FIG. 5) is disposed between the positive terminal 50p and the negative terminal 50n.

As shown in FIGS. 6D and 7, the negative electrode terminal portion 23C1N of the capacitor element 23C1 and the positive electrode terminal portion 23C2P of the capacitor element 23C2 are disposed adjacent to each other and face each other.
As shown in FIG. 6C and FIG. 7, the position of the protruding portion 23C1N1 of the negative electrode terminal portion 23C1N of the capacitor element 23C1 and the position of the protruding portion 23C2P1 of the positive electrode terminal portion 23C2P of the capacitor element 23C2 are the power converter 1. (In the direction in which the negative electrode terminal portion 23C1N and the positive electrode terminal portion 23C2P extend) (the vertical direction in FIG. 6C, the lower left-upper right direction in FIG. 7).
Therefore, in the capacitor unit 23 of the first embodiment, the position of the protruding portion 23C1N1 of the negative electrode terminal portion 23C1N and the position of the protruding portion 23C2P1 of the positive electrode terminal portion 23C2P are in the width direction of the power converter 1 (up and down in FIG. 6C). Direction, lower left-upper right direction in FIG. 7), and the negative electrode terminal portion 23C1N and the positive electrode terminal portion 23C2P are arranged apart from each other in order to secure an insulation distance between the negative electrode terminal portion 23C1N and the positive electrode terminal portion 23C2P. Compared with the case where it is made, the depth direction dimension (the left-right direction dimension of FIG. 6 (A), FIG.6 (B) and FIG.6 (C)) of the whole power converter device 1 can be reduced in size.
That is, in the capacitor unit 23 of the first embodiment, the negative electrode terminal portion 23C1N and the positive electrode terminal portion 23C2P are disposed adjacent to each other in the left-right direction in FIG. 6D, and the protruding portion 23C1N1 of the negative electrode terminal portion 23C1N and the positive electrode An insulation distance between the terminal portion 23C2P and the protruding portion 23C2P1 can be ensured in the vertical direction of FIG.

As shown in FIGS. 6A and 6B, the negative electrode terminal portion 23C2N of the capacitor element 23C2 and the positive electrode terminal portion 23C3P of the capacitor element 23C3 are disposed adjacent to each other and face each other.
As shown in FIG. 6C, the position of the protruding portion 23C2N1 of the negative electrode terminal portion 23C2N of the capacitor element 23C2 and the position of the protruding portion 23C3P1 of the positive electrode terminal portion 23C3P of the capacitor element 23C3 are determined in the width direction of the power conversion device 1. (The direction in which the negative electrode terminal portion 23C2N and the positive electrode terminal portion 23C3P extend) (the vertical direction in FIG. 6C) is shifted.
Therefore, in the capacitor unit 23 of the first embodiment, the position of the protruding portion 23C2N1 of the negative electrode terminal portion 23C2N and the position of the protruding portion 23C3P1 of the positive electrode terminal portion 23C3P are in the width direction of the power converter 1 (up and down in FIG. 6C). In order to secure an insulation distance between the negative electrode terminal portion 23C2N and the positive electrode terminal portion 23C3P, the electric power is larger than when the negative electrode terminal portion 23C2N and the positive electrode terminal portion 23C3P are arranged apart from each other. The overall depth direction dimension of the conversion device 1 (the horizontal dimension in FIGS. 6A, 6B, and 6C) can be reduced.
That is, in the capacitor unit 23 of the first embodiment, the negative electrode terminal portion 23C2N and the positive electrode terminal portion 23C3P are disposed adjacent to each other in the left-right direction in FIG. An insulation distance between the terminal portion 23C3P and the protruding portion 23C3P1 can be ensured in the vertical direction of FIG.

As shown in FIGS. 10A and 10B, a capacitor case (lower case) 23B constituted by a positive electrode terminal 50p and a negative electrode terminal 50n is transformed into a capacitor case (upper case) by a known technique such as welding. Case) It is joined to 23A, and the assembly of the capacitor unit 23 is completed.
Next, as shown in FIGS. 10C and 10D, the power module 21 and the capacitor unit 23 are electrically connected by assembling the capacitor unit 23 to the mounting portion MP (see FIG. 1). The assembly of the power conversion device 1 is completed.
Specifically, the positive electrode side conductor PI and the negative electrode side conductor NI connected to the second power conversion circuit unit 32 are electrically connected to the central connection unit 50p1 and connection unit 50n1 in FIG. 10B. . The positive electrode side conductor PI and the negative electrode side conductor NI connected to the first power conversion circuit unit 31 are electrically connected to the rightmost connection part 50p1 and connection part 50n1 in FIG. The positive electrode side conductor PI and the negative electrode side conductor NI connected to the third power conversion circuit unit 33 are electrically connected to the leftmost connection portion 50p1 and connection portion 50n1 in FIG.

Second Embodiment
Hereinafter, 2nd Embodiment of the power converter device of this invention and the capacitor | condenser for power converter devices is described.
The power converter 1 and the capacitor unit 23 of the second embodiment are configured in the same manner as the power converter 1 and the capacitor unit 23 of the first embodiment described above, except for the points described below. Therefore, according to the power conversion device 1 and the capacitor unit 23 of the second embodiment, the same effects as those of the power conversion device 1 and the capacitor unit 23 of the first embodiment described above can be obtained except for the points described below.

In the power conversion device 1 of the first embodiment, as illustrated in FIG. 3, the power module 21 includes a first power conversion circuit unit 31, a second power conversion circuit unit 32, and a third power conversion circuit unit 33. I have. That is, the power module 21 has a plurality of upper arm elements UH, VH, WH, S1 (see FIG. 11) and a plurality of lower arm elements UL, VL, WL, S2 (see FIG. 11).
On the other hand, in the power converter 1 of the second embodiment, the power module 21 has one upper arm element UH and one lower arm element UL. That is, the power module 21 and the capacitor unit 23 are electrically connected by one positive electrode side conductor PI and one negative electrode side conductor NI.

In the power conversion device 1 of the first embodiment, as shown in FIG. 6, the capacitor unit 23 includes three capacitor elements 23C1, 23C2, and 23C3.
On the other hand, in the power conversion device 1 according to the second embodiment, the capacitor unit 23 includes one capacitor element 23C1.

  Also by the power conversion device 1 of the second embodiment in which the power module 21 has one upper arm element UH and one lower arm element UL, and the capacitor unit 23 includes one capacitor element 23C1. The same effects as those of the power conversion device 1 of the first embodiment can be obtained.

<Third Embodiment>
Hereinafter, 2nd Embodiment of the power converter device of this invention and the capacitor | condenser for power converter devices is described.
The power converter 1 and the capacitor unit 23 of the third embodiment are configured in the same manner as the power converter 1 and the capacitor unit 23 of the first embodiment described above, except for the points described below. Therefore, according to the power converter 1 and the capacitor unit 23 of the third embodiment, the same effects as those of the power converter 1 and the capacitor unit 23 of the first embodiment described above can be obtained except for the points described below.

In the power conversion device 1 of the first embodiment, as shown in FIG. 6, the capacitor unit 23 includes three capacitor elements 23C1, 23C2, and 23C3.
On the other hand, in the power conversion device 1 of the third embodiment, the capacitor unit 23 includes two capacitor elements 23C1 and 23C2.

  Also by the capacitor unit 23 of the third embodiment in which the capacitor unit 23 includes two capacitor elements 23C1 and 23C2, the same effects as the capacitor unit 23 of the first embodiment can be obtained.

<Application example>
Hereinafter, application examples of the power converter of the present invention and the capacitor for the power converter will be described with reference to the accompanying drawings.
FIG. 11 is a diagram illustrating an example of a part of the vehicle 10 to which the power conversion device 1 according to the first to third embodiments can be applied.

When the power conversion device 1 of the first or third embodiment is applied to the example shown in FIG. 11, one power conversion device 1 of the first or third embodiment is used for the vehicle 10 shown in FIG. It is done.
Specifically, the first power conversion circuit unit 31, the second power conversion circuit unit 32, and the third power conversion circuit unit 33 (see FIG. 3) of the power module 21 of the power conversion device 1 of the first or third embodiment. The first power conversion circuit unit 31, the second power conversion circuit unit 32, and the third power conversion circuit unit 33 shown in FIG.
The capacitor unit 23 having the positive terminal 50p and the negative terminal 50n of the power conversion device 1 of the first or third embodiment is the positive terminal (positive bus bar) 50p and the negative terminal (negative bus bar) of the capacitor unit 23 shown in FIG. 50n and the 2nd smoothing capacitor 42 arrange | positioned among them are comprised.

When the power conversion device 1 of the second embodiment is applied to the example shown in FIG. 11, seven power conversion devices 1 of the second embodiment are used in the vehicle 10 shown in FIG.
Specifically, the power module 21 of the first power conversion device 1 of the second embodiment constitutes the U phase of the first power conversion circuit unit 31 shown in FIG. The power module 21 of the second power conversion device 1 of the second embodiment constitutes the V phase of the first power conversion circuit unit 31 shown in FIG. The power module 21 of the power conversion device 1 of the third second embodiment constitutes the W phase of the first power conversion circuit unit 31 shown in FIG.
The power module 21 of the power conversion device 1 of the fourth second embodiment constitutes the U phase of the second power conversion circuit unit 32 shown in FIG. The power module 21 of the fifth power conversion device 1 of the second embodiment constitutes the V phase of the second power conversion circuit unit 32 shown in FIG. The power module 21 of the sixth power conversion apparatus 1 of the second embodiment constitutes the W phase of the second power conversion circuit unit 32 shown in FIG.
The power module 21 of the seventh power conversion device 1 of the second embodiment constitutes a third power conversion circuit unit 33 shown in FIG.
The capacitor unit 23 having the positive electrode terminal 50p and the negative electrode terminal 50n of the seven power conversion devices 1 of the second embodiment is connected in parallel, and the positive electrode terminal (positive electrode bus bar) 50p and the negative electrode of the capacitor unit 23 shown in FIG. A terminal (negative electrode bus bar) 50n and a second smoothing capacitor 42 arranged between them are configured.

In the example shown in FIG. 11, in addition to the power converter 1, the vehicle 10 includes a battery 11 (BATT), a first motor 12 (MOT) for driving and a second motor 13 (GEN) for power generation. I have.
The battery 11 includes a battery case and a plurality of battery modules accommodated in the battery case. The battery module includes a plurality of battery cells connected in series. The battery 11 includes a positive terminal PB and a negative terminal NB that are connected to the DC connector 1a of the power converter 1. The positive terminal PB and the negative terminal NB are connected to positive and negative ends of a plurality of battery modules connected in series in the battery case.

  The first motor 12 generates a rotational driving force (power running operation) with the electric power supplied from the battery 11. The second motor 13 generates generated power by the rotational driving force input to the rotating shaft. Here, the second motor 13 is configured to be able to transmit the rotational power of the internal combustion engine. For example, each of the first motor 12 and the second motor 13 is a three-phase AC brushless DC motor. The three phases are the U phase, the V phase, and the W phase. Each of the first motor 12 and the second motor 13 is an inner rotor type. The first motor 12 and the second motor 13 are each provided with a rotor having a permanent magnet for field and a stator having a three-phase stator winding for generating a rotating magnetic field for rotating the rotor. Yes. The three-phase stator windings of the first motor 12 are connected to the first three-phase connector 1 b of the power conversion device 1. The three-phase stator winding of the second motor 13 is connected to the second three-phase connector 1 c of the power conversion device 1.

The power conversion device 1 shown in FIG. 11 includes a power module 21, a reactor 22, a capacitor unit 23, a resistor 24, a first current sensor 25, a second current sensor 26, a third current sensor 27, An electronic control unit 28 (MOT GEN ECU) and a gate drive unit 29 (G / D VCU ECU) are provided.
The power module 21 includes a first power conversion circuit unit 31, a second power conversion circuit unit 32, and a third power conversion circuit unit 33.

The output-side conductor (output bus bar) 51 of the first power conversion circuit unit 31 is connected to the first three-phase connector 1b by collecting three phases of the U phase, the V phase, and the W phase. That is, the output-side conductor 51 of the first power conversion circuit unit 31 is connected to the three-phase stator windings of the first motor 12 via the first three-phase connector 1b.
The positive electrode side conductor (P bus bar) PI of the first power conversion circuit unit 31 is connected to the positive electrode terminal PB of the battery 11 by collecting three phases of the U phase, the V phase, and the W phase.
The negative electrode-side conductor (N bus bar) NI of the first power conversion circuit unit 31 is connected to the negative electrode terminal NB of the battery 11 by collecting three phases of the U phase, the V phase, and the W phase.
That is, the first power conversion circuit unit 31 converts DC power input from the battery 11 via the third power conversion circuit unit 33 into three-phase AC power.

The output side conductor (output bus bar) 52 of the second power conversion circuit unit 32 is connected to the second three-phase connector 1c by collecting three phases of the U phase, the V phase, and the W phase. That is, the output-side conductor 52 of the second power conversion circuit unit 32 is connected to the three-phase stator windings of the second motor 13 via the second three-phase connector 1c.
The positive electrode side conductor (P bus bar) PI of the second power conversion circuit unit 32 is collected for three phases of the U phase, the V phase, and the W phase, and the positive terminal PB of the battery 11 and the first power conversion circuit unit 31. Connected to the positive electrode-side conductor PI.
The negative electrode side conductor (N bus bar) NI of the second power conversion circuit unit 32 is gathered for three phases of the U phase, the V phase, and the W phase, and the negative electrode terminal NB of the battery 11 and the second power conversion circuit unit 32. To the negative electrode side conductor NI.
The second power conversion circuit unit 32 converts the three-phase AC power input from the second motor 13 into DC power. The DC power converted by the second power conversion circuit unit 32 can be supplied to at least one of the battery 11 and the first power conversion circuit unit 31.

In the example shown in FIG. 11, the U-phase upper arm element UH, the V-phase upper arm element VH, the W-phase upper arm element WH of the first power conversion circuit unit 31, and the U-phase upper arm of the second power conversion circuit unit 32. The element UH, the V-phase upper arm element VH, and the W-phase upper arm element WH are connected to the positive electrode-side conductor PI. The positive electrode side conductor PI is connected to the positive electrode terminal (positive electrode bus bar) 50 p of the capacitor unit 23.
U-phase lower arm element UL, V-phase lower arm element VL, W-phase lower arm element WL of first power conversion circuit unit 31, and U-phase lower arm element UL, V-phase lower arm of second power conversion circuit unit 32 The element VL and the W-phase lower arm element WL are connected to the negative electrode side conductor NI. The negative electrode side conductor NI is connected to the negative electrode terminal (negative electrode bus bar) 50 n of the capacitor unit 23.

In the example shown in FIG. 11, the connection point TI between the U-phase upper arm element UH and the U-phase lower arm element UL of the first power conversion circuit unit 31, and the V-phase upper arm element VH and the V-phase lower arm element VL A connection point TI and a connection point TI between the W-phase upper arm element WH and the W-phase lower arm element WL are connected to the output-side conductor 51.
The connection point TI between the U-phase upper arm element UH and the U-phase lower arm element UL, the connection point TI between the V-phase upper arm element VH and the V-phase lower arm element VL, and the W phase of the second power conversion circuit unit 32 A connection point TI between the upper arm element WH and the W-phase lower arm element WL is connected to the output-side conductor 52.

In the example shown in FIG. 11, the output-side conductor 51 of the first power conversion circuit unit 31 is connected to the first input / output terminal Q1. The first input / output terminal Q1 is connected to the first three-phase connector 1b. The connection point TI of each phase of the first power conversion circuit unit 31 is the stator winding of each phase of the first motor 12 via the output-side conductor 51, the first input / output terminal Q1, and the first three-phase connector 1b. Connected to the wire.
The output-side conductor 52 of the second power conversion circuit unit 32 is connected to the second input / output terminal Q2. The second input / output terminal Q2 is connected to the second three-phase connector 1c. The connection point TI of each phase of the second power conversion circuit unit 32 is a stator winding of each phase of the second motor 13 via the output-side conductor 52, the second input / output terminal Q2, and the second three-phase connector 1c. Connected to the wire.

In the example shown in FIG. 11, each of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the first power conversion circuit unit 31 includes a flywheel diode.
Similarly, each of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the second power conversion circuit unit 32 includes a flywheel diode.

In the example shown in FIG. 11, the gate drive unit 29 inputs a gate signal to each of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the first power conversion circuit unit 31.
Similarly, the gate drive unit 29 inputs a gate signal to each of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the second power conversion circuit unit 32.
The first power conversion circuit unit 31 converts DC power input from the battery 11 through the third power conversion circuit unit 33 into three-phase AC power, and the AC power is transferred to the three-phase stator winding of the first motor 12. A U-phase current, a V-phase current, and a W-phase current are supplied. The second power conversion circuit unit 32 turns on each of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the second power conversion circuit unit 32 synchronized with the rotation of the second motor 13. The three-phase AC power output from the three-phase stator winding of the second motor 13 is converted into DC power by (conduction) / off (cutoff) drive.

  The third power conversion circuit unit 33 is a voltage control unit (VCU). The third power conversion circuit unit 33 includes an upper arm element S1 and a lower arm element S2 for one phase.

  The positive electrode of the upper arm element S1 is connected to the positive bus bar PV. The positive electrode bus bar PV is connected to the positive electrode terminal (positive electrode bus bar) 50 p of the capacitor unit 23. The electrode on the negative side of the lower arm element S2 is connected to the negative bus bar NV. The negative electrode bus bar NV is connected to the negative electrode terminal (negative electrode bus bar) 50 n of the capacitor unit 23. The negative terminal 50 n of the capacitor unit 23 is connected to the negative terminal NB of the battery 11. The electrode on the negative side of the upper arm element S1 is connected to the electrode on the positive side of the lower arm element S2. The upper arm element S1 and the lower arm element S2 include flywheel diodes.

  A bus bar 53 that constitutes a connection point between the upper arm element S 1 and the lower arm element S 2 of the third power conversion circuit unit 33 is connected to one end of the reactor 22. The other end of the reactor 22 is connected to the positive terminal PB of the battery 11. The reactor 22 includes a coil and a temperature sensor that detects the temperature of the coil. The temperature sensor is connected to the electronic control unit 28 by a signal line.

  The third power conversion circuit unit 33 turns on the upper arm element S1 and the lower arm element S2 based on the gate signals input from the gate drive unit 29 to the gate electrode of the upper arm element S1 and the gate electrode of the lower arm element S2. Switch between (conducting) and off (blocking).

  The third power conversion circuit unit 33 has a first state in which the lower arm element S2 is set to ON (conduction) and the upper arm element S1 is set to OFF (cutoff) and the lower arm element S2 is turned off (cutoff) during boosting. And the 2nd state by which upper arm element S1 is set to ON (conduction) is changed over alternately. In the first state, current flows sequentially to the positive terminal PB of the battery 11, the reactor 22, the lower arm element S2, and the negative terminal NB of the battery 11, and the reactor 22 is DC-excited to accumulate magnetic energy. In the second state, an electromotive voltage (inductive voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux resulting from the interruption of the current flowing through the reactor 22. The induced voltage due to the magnetic energy accumulated in the reactor 22 is superimposed on the battery voltage, and a boosted voltage higher than the voltage between the terminals of the battery 11 is generated between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33. Applied.

  The third power conversion circuit unit 33 alternately switches between the second state and the first state during regeneration. In the second state, current flows sequentially to the positive electrode bus bar PV, the upper arm element S1, the reactor 22, and the positive terminal PB of the battery 11 of the third power conversion circuit unit 33, and the reactor 22 is DC-excited to accumulate magnetic energy. Is done. In the first state, an electromotive voltage (inductive voltage) is generated between both ends of the reactor 22 so as to prevent a change in magnetic flux resulting from the interruption of the current flowing through the reactor 22. The induced voltage due to the magnetic energy accumulated in the reactor 22 is stepped down, and the stepped-down voltage lower than the voltage between the positive bus bar PV and the negative bus bar NV of the third power conversion circuit unit 33 is reduced to the positive terminal PB and the negative terminal NB of the battery 11. Between.

  The capacitor unit 23 includes a first smoothing capacitor 41, a second smoothing capacitor 42, and a noise filter 43.

The first smoothing capacitor 41 is connected between the positive terminal PB and the negative terminal NB of the battery 11. The first smoothing capacitor 41 smoothes voltage fluctuations that occur with the on / off switching operation of the upper arm element S1 and the lower arm element S2 during the regeneration of the third power conversion circuit unit 33.
The second smoothing capacitor 42 is provided between the positive-side conductor PI and the negative-side conductor NI of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 and the positive bus bar PV of the third power conversion circuit unit 33. And the negative bus bar NV. The second smoothing capacitor 42 is connected to the positive electrode side conductor PI and the negative electrode side conductor NI, and the positive electrode bus bar PV and the negative electrode bus bar NV via the positive electrode terminal (positive electrode bus bar) 50p and the negative electrode terminal (negative electrode bus bar) 50n. Has been. The second smoothing capacitor 42 performs an on / off switching operation of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the first power conversion circuit unit 31 and the second power conversion circuit unit 32. Smooth the voltage fluctuations that accompany it. The second smoothing capacitor 42 smoothes voltage fluctuations generated by the on / off switching operation of the upper arm element S1 and the lower arm element S2 when the third power conversion circuit unit 33 is boosted.

The noise filter 43 is provided between the positive-side conductor PI and the negative-side conductor NI of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive bus bar PV and the negative electrode of the third power conversion circuit unit 33. Connected between bus bars NV. The noise filter 43 includes two capacitors connected in series. The connection point of the two capacitors is connected to the body ground of the vehicle 10 or the like.
The resistor 24 is provided between the positive-side conductor PI and the negative-side conductor NI of each of the first power conversion circuit unit 31 and the second power conversion circuit unit 32, and between the positive bus bar PV and the negative electrode of the third power conversion circuit unit 33. Connected between bus bars NV.

The first current sensor 25 forms a connection point TI of each phase of the first power conversion circuit unit 31, and is disposed on the output-side conductor 51 connected to the first input / output terminal Q1, and includes a U phase, a V phase, And the current of each of the W phases is detected. The second current sensor 26 is disposed on the output-side conductor 52 that forms the connection point TI of each phase of the second power conversion circuit unit 32 and is connected to the second input / output terminal Q2, and includes the U-phase, V-phase, and Each current of the W phase is detected. The third current sensor 27 is disposed on a bus bar 53 that forms a connection point between the upper arm element S1 and the lower arm element S2 and is connected to the reactor 22, and detects a current flowing through the reactor 22.
Each of the first current sensor 25, the second current sensor 26, and the third current sensor 27 is connected to the electronic control unit 28 by a signal line.

  The electronic control unit 28 controls each operation of the first motor 12 and the second motor 13. For example, the electronic control unit 28 is a software function unit that functions when a predetermined program is executed by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) including a processor such as a CPU, a ROM (Read Only Memory) that stores a program, a RAM (Random Access Memory) that temporarily stores data, and an electronic circuit such as a timer. is there. Note that at least a part of the electronic control unit 28 may be an integrated circuit such as an LSI (Large Scale Integration). For example, the electronic control unit 28 performs current feedback control using the current detection value of the first current sensor 25 and the current target value corresponding to the torque command value for the first motor 12, and the like, and inputs it to the gate drive unit 29. Generate a control signal. For example, the electronic control unit 28 performs current feedback control using the current detection value of the second current sensor 26 and the current target value corresponding to the regenerative command value for the second motor 13, and the like, and inputs it to the gate drive unit 29. Generate a control signal. The control signal drives each of the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the first power conversion circuit unit 31 and the second power conversion circuit unit 32 to be on (conductive) / off (cut off). It is a signal which shows the timing to perform. For example, the control signal is a pulse width modulated signal or the like.

Based on the control signal received from the electronic control unit 28, the gate drive unit 29 is configured to have the upper arm elements UH, VH, WH and the lower arm elements UL, VL, WL of the first power conversion circuit unit 31 and the second power conversion circuit unit 32. A gate signal for actually driving on (conducting) / off (cutting off) each of these is generated. For example, the gate drive unit 29 performs control signal amplification, level shift, and the like to generate a gate signal.
The gate drive unit 29 generates a gate signal for driving each of the upper arm element S1 and the lower arm element S2 of the third power conversion circuit unit 33 to be on (conductive) / off (cut off). For example, the gate drive unit 29 generates a gate signal having a duty ratio corresponding to the boost voltage command at the time of boosting of the third power conversion circuit unit 33 or the step-down voltage command at the time of regeneration of the third power conversion circuit unit 33. The duty ratio is a ratio of the upper arm element S1 and the lower arm element S2.

  In the example illustrated in FIG. 11, the power conversion device 1 according to the first to third embodiments is applied to the vehicle 10. In other examples, for example, an elevator, a pump, a fan, a railway vehicle, an air conditioner, a refrigerator, a laundry The power conversion device 1 of the first to third embodiments may be applied to things other than the vehicle 10 such as a machine.

  The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Power converter, UH ... Upper arm element, UL ... Lower arm element, 21 ... Power module, 23 ... Capacitor unit, 23A ... Capacitor case, 23B ... Capacitor case, 50p ... Positive electrode terminal, 50p1 ... Connection part, 50p21 ... Connection hole, 50p22 ... connection hole, 50p23 ... connection hole, 50n ... negative electrode terminal, 50n1 ... connection part, 50n21 ... connection hole, 50n22 ... connection hole, 50n23 ... connection hole, 23C1, 23C2, 23C3 ... capacitor element, 23C1A, 23C2A , 23C3A ... main body, 23C1P, 23C2P, 23C3P ... positive terminal, 23C1P1,23C2P1,23C3P1, ... projection, 23C1N, 23C2N, 23C3N ... negative electrode terminal, 23C1N1,23C2N1,23C3N1 ... projection, 23D ... potting material, 2 E ... Flange part, MP ... Mounting part, MP1 ... Mounting position, MP2 ... Mounting position, SP1 ... Retractable part, SP2 ... Retractable part, PI ... Positive electrode side conductor, NI ... Negative electrode side conductor, WJ ... Heat radiation part , CS ... module case, BT ... bolt, GS ... gate signal line, SA ... substrate, 10 ... vehicle

Claims (6)

A semiconductor module having an upper arm element and a lower arm element;
A capacitor,
A mounting portion on which the capacitor is mounted;
A conductor set for connecting the semiconductor module and the capacitor;
The conductor set includes a first pole-side conductor and a second pole-side conductor having a polarity different from that of the first pole-side conductor,
The capacitor includes a capacitor element, a first pole terminal having the same polarity as the first pole-side conductor, and a second pole terminal having the same polarity as the second pole-side conductor,
At least a part of the first electrode terminal and the second electrode terminal is exposed outside the capacitor,
The first pole-side conductor and the second pole-side conductor are disposed between the capacitor and the mounting portion,
In the state where the capacitor is mounted on the mounting portion,
The first pole-side conductor is disposed at a position facing the first pole terminal, and the second pole-side conductor is disposed at a position facing the second pole terminal;
The first pole-side conductor is electrically connected to the first pole terminal, and the second pole-side conductor is electrically connected to the second pole terminal;
Power conversion device. Between the capacitor and the mounting portion, the first pole-side conductor is disposed closer to the mounting portion than the first pole terminal, and the second pole-side conductor is the second pole terminal. Than the mounting part side,
The power conversion device according to claim 1. The first pole terminal and the second pole terminal are arranged in parallel with each other at a predetermined distance,
Between the capacitor and the mounting portion, the first pole-side conductor and the second pole-side conductor are arranged in parallel with each other with a predetermined distance therebetween.
The power converter device of Claim 1 or Claim 2. A conductive first retractable component is disposed at a joint between the first pole-side conductor and the first pole terminal,
A conductive second retractable component is disposed at the joint between the second pole-side conductor and the second pole terminal.
The power converter device as described in any one of Claims 1-3. When the first pole side conductor and the second pole side conductor are viewed from the capacitor side,
A portion of the first pole side conductor is covered with the second pole side conductor,
The portion of the first pole-side conductor that is not covered by the second pole-side conductor faces the first pole terminal,
The second pole-side conductor covering a part of the first pole-side conductor faces the second pole terminal,
The power converter device as described in any one of Claims 1-4. At least a first capacitor element; a second capacitor element disposed adjacent to the first capacitor element; a first electrode terminal; and a second electrode terminal having a polarity different from that of the first electrode terminal;
The first capacitor element is
A first body portion;
A plate-like first terminal portion disposed at one end of the first main body portion and having the same polarity as the first pole terminal;
A plate-like second terminal portion disposed at the other end of the first main body portion and having the same polarity as the second electrode terminal and parallel to the first terminal portion;
The second capacitor element is
A second body portion;
A plate-like third terminal portion disposed at one end of the second main body portion and having the same polarity as the first pole terminal;
A plate-like fourth terminal portion disposed at the other end of the second main body portion and having the same polarity as the second pole terminal and parallel to the third terminal portion;
The first pole terminal is disposed orthogonal to the first terminal portion and the third terminal portion,
The second pole terminal is disposed orthogonal to the second terminal section and the fourth terminal section, and is disposed adjacent to the first pole terminal,
The second terminal portion and the third terminal portion are adjacent and facing each other,
The second terminal portion includes a protrusion electrically connected to the second electrode terminal,
The third terminal portion includes a protrusion electrically connected to the first electrode terminal,
The position of the protruding portion of the second terminal portion and the position of the protruding portion of the third terminal portion are shifted,
Capacitor for power converter.

Images