JP2003116281A - Inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of an inverter for inverting DC power into AC power in an electric automobile or the like. SOLUTION: An inverter circuit is contained in an inverter circuit module 70 and a pair of circuit terminals 90 and 92 connected to the DC side of the inverter circuit are arranged on the surface of the case thereof. A capacitor module 72 has two pairs of electrodes fixed integrally to the case wherein one pair is jointed directly to the circuit terminals 90 and 92 with bolts and the other pair is jointed directly to the power supply terminals 94 and 96 of a DC power supply module 74 with bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device for converting DC power and AC power.

[0002]

2. Description of the Related Art When driving an AC motor with a DC power supply,
For example, when driving a motor of an electric vehicle, a power conversion unit that converts DC power supplied from a battery or the like into AC power is required, and an inverter circuit is used for this power conversion unit. A smoothing capacitor is provided on the DC power source side of the inverter circuit to smooth the output of the DC power source.

FIG. 5 is a schematic circuit diagram of an inverter device. Here, the inverter device is the inverter circuit 2
And a battery 4 which is a DC power source connected to the input side terminal
And the smoothing capacitor 6, and the generated three-phase AC power is supplied to the AC motor 8.

In the case of an electric vehicle, the capacity of the smoothing capacitor 6 used is large and reaches several thousand μF. In an electric vehicle, for example, a smoothing capacitor realizes the large capacity by connecting a plurality of capacitors in parallel.

When a plurality of AC motors 8 are provided, a plurality of inverter circuits 2 are also provided to generate a plurality of AC power from a common DC power source.

FIG. 6 is a schematic diagram showing a schematic configuration of a conventional inverter device. This configuration has two inverter circuits. Each inverter circuit is stored in a separate inverter circuit module 20, 22. The smoothing capacitor is composed of a plurality of capacitors 24. Two bus bars 26 and 28 are used for these connections. The bus bars 26 and 28 are connected to the positive and negative electrodes of the DC power source by the input cables 30 and 32, respectively. One of the pair of input terminals 34, 36 of the inverter circuit module 20 is connected to the bus bar 26, and the other is connected to the bus bar 28. Similarly, one of the pair of input terminals 38, 40 of the inverter circuit module 22 is connected to the bus bar 26, and the other is connected to the bus bar 28. A plurality of capacitors 24 are also connected between the bus bars 26 and 28, respectively.

In the conventional structure, in order to interconnect the respective constituent elements of the inverter device, a bus bar is required in addition to those constituent elements, and the number of parts is increased accordingly, resulting in a device configuration There is a problem that simplification is hindered and assembly work is troublesome. Further, in order to pass the bus bar between the components of the inverter device, it is necessary to provide a space between the components, and also a space for ensuring insulation is required, which makes it difficult to downsize the inverter device. It was

The present invention has been made to solve the above problems, and an object of the present invention is to provide an inverter device which can be made compact and simple.

[0008]

An inverter device according to the present invention stores an inverter circuit for mutually converting DC power and AC power in a case, and a pair of circuits on the DC side of the inverter circuit on the surface of the case. An inverter circuit module in which terminals are arranged, and a capacitor module having a smoothing capacitor provided on the DC side of the inverter circuit stored in a case, the capacitor module is integrally attached to the case of the capacitor module, It has a pair of first capacitor module terminals electrically connected to both terminals of the smoothing capacitor, the capacitor module is arranged adjacent to the inverter circuit module, and the first capacitor module terminal is provided at the circuit terminal. Directly connected.

According to the present invention, the first capacitor module terminal, which is the terminal of the capacitor module, and the circuit terminal, which is the terminal of the inverter circuit module, are directly connected without a bus bar. In addition, the space between the modules can be reduced by directly connecting the terminals of the modules without using the bus bar.

In another inverter device according to the present invention, the inverter circuit module stores a plurality of the inverter circuits, and the DC sides of the plurality of inverter circuits are connected in parallel to a common pair of circuit terminals.

According to the present invention, a plurality of inverter circuits are stored in one inverter circuit module, and a pair of circuit terminals provided in the module are common DC side terminals of each inverter circuit. This facilitates the connection between the plurality of inverter circuits and the smoothing capacitor without using a bus bar, and further downsizes the device as compared with the case where each inverter circuit is a separate module.

The inverter device according to another aspect of the present invention further includes a DC power supply module for supplying the DC power from a pair of power supply terminals, wherein the capacitor module is integrally attached to a case of the capacitor module, The second capacitor module terminal is electrically connected to both terminals of the smoothing capacitor, the capacitor module is arranged adjacent to the DC power supply module, and the second capacitor module terminal is directly connected to the circuit terminal. To be done.

According to the present invention, the power supply terminal, which is the terminal of the DC power supply module, and the second capacitor module terminal are also directly connected without the bus bar. That is, the inverter circuit, the DC power supply, and the smoothing capacitor are electrically connected to each other without using the bus bar. As a result, the number of parts is reduced and the space for arranging the bus bar is not required, so that the device can be downsized. The second capacitor module terminal and the first capacitor module terminal may be configured in common.

According to a preferred aspect of the present invention, the DC power supply module is an inverter device having a boosting reactor between a battery and the power input / output terminal.

In still another inverter device according to the present invention, the first capacitor module terminal and the circuit terminal are coupled to each other by co-fastening.

According to the present invention, the structure of the coupling portion between the first capacitor module terminal and the circuit terminal is simplified and the size is reduced. Similarly, the second capacitor module terminal and the power supply terminal can be jointly fastened to each other, and the structure of the joint can be simplified and downsized.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an inverter device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic circuit diagram of the present inverter device for explaining the module configuration.
This inverter device has two inverter circuits 50, 5
2, a battery 54, and a smoothing capacitor 56. The battery 54 is connected between the common input side terminals of the inverter circuits 50 and 52. That is, the inverter circuit 5
0 and 52 are connected in parallel to the battery 54. The smoothing capacitor 56 is also connected in parallel to the battery 54 between the common input side terminals of the inverter circuits 50 and 52. The switching elements that form the inverter circuits 50 and 52 are externally switched and controlled, whereby the inverter circuits 50 and 52 are controlled.
Converts the input DC power into three-phase AC power and supplies the AC power to the AC motors 58 and 60, respectively.

Of these constituent elements, two inverter circuits 50 and 52 are one inverter circuit module 7
Stored in 0. The smoothing capacitor 56 is stored in the capacitor module 72. Here, the smoothing capacitor 56 may be configured by connecting a plurality of capacitors in parallel, but the capacitor module 72 accommodates all of them. The battery 54 constitutes a DC power supply module 74.

Similarly, FIG. 2 is a schematic circuit diagram of an inverter device having a reactor at the output of a DC power supply, and is for explaining the module configuration in this case. This circuit configuration is different from that of FIG.
The point is that a reactor 80 and a switching circuit 82 are provided to boost the voltage of and to supply it to the inverter circuits 50 and 52. In this circuit configuration, the reactor 80 and the switching circuit 82 are housed in the DC power supply module 74 together with the battery 54. In the configuration using the reactor 80 for boosting, it is preferable that the smoothing capacitor 56 be a film capacitor.

FIG. 3 is a schematic top view of the present inverter device, and FIG. 4 is a schematic side view. The inverter circuit module 70 and the DC power supply module 74 are horizontally adjacent to each other, and the capacitor module 72 is closely arranged on the inverter circuit module 70.

On the upper surface of the inverter circuit module 70, a pair of positive and negative circuit terminals 90 and 92 common to the inverter circuits 50 and 52 stored inside are arranged. A pair of positive and negative power supply terminals 94 and 96 for outputting DC power are arranged on the upper surface of the DC power supply module 74.

In the case of the capacitor module 72,
Two pairs of electrodes are previously integrally attached to the case.
When the capacitor module 72 is arranged at a predetermined position on the inverter circuit module 70, these electrodes overlap the circuit terminals 90 and 92 of the inverter circuit module 70 with the ends of the first pair of electrodes 100 and 102, respectively. The length and the attachment position to the case are set so that the ends of the pair of electrodes 104 and 106 overlap the power supply terminals 94 and 96 of the DC power supply module 74, respectively. The electrodes 100 and 104 respectively corresponding to the positive electrodes are electrically connected to each other by a thick and low resistance conductor inside the capacitor module 72, and the conductor is connected to the smoothing capacitor 5
6 is connected to one end. In addition, the electrodes 102 and 106 corresponding to the negative electrodes are similarly formed in the capacitor module 7 as well.
2 is electrically connected to each other by a thick and low resistance conductor, and the conductor is connected to the other end of the smoothing capacitor 56.

Electrodes 100 of the capacitor module 72,
As shown in FIG. 4, 102 is fastened together with the circuit terminals 90 and 92 of the inverter circuit module 70 with the bolt 110, is electrically coupled, and is fixed to the inverter circuit module 70. Similarly, the bolts clamp the electrodes 104 and 106 of the capacitor module 72 to the power supply terminals 94 and 96 of the DC power supply module 74,
It is electrically coupled and fixed to the DC power supply module 74.

[0025]

According to the inverter device of the present invention, each component of the inverter device is directly connected to each other without using a connecting member such as a bus bar. Therefore, the bus bar and the bolt for connecting the bus bar to the terminal are connected. It is possible to reduce the number of parts such as the above, simplify the device configuration, and facilitate the assembling work. Further, the space for arranging the bus bar between the constituent elements of the inverter device, and the space for ensuring the insulation from the bus bar are not required, and the size of the inverter device can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram showing a module configuration of the present inverter device.

FIG. 2 is a schematic circuit diagram showing a module configuration of the present inverter device provided with a reactor at the output of a DC power supply.

FIG. 3 is a schematic top view of the present inverter device.

FIG. 4 is a schematic side view of the present inverter device.

FIG. 5 is a schematic circuit diagram of an inverter device.

FIG. 6 is a schematic diagram showing a schematic configuration of a conventional inverter device.

[Explanation of symbols]

50,52 Inverter circuit, 54 Battery, 56 Smoothing capacitor, 70 Inverter circuit module, 72
Capacitor module, 74 DC power supply module, 9
0,92 circuit terminal, 94,96 power supply terminal, 10
0, 102, 104, 106 electrodes, 110 volts.

Continued front page    (72) Inventor Hitoshi Imura             1-47-1 Nakono, Nakamura-ku, Nagoya-shi, Aichi             Nagoya International Center Building 23F             Within the pro F term (reference) 5H007 BB06 CB04 CB05 CC05 CC12                       CC23 HA03 HA04 HA05

Claims (5)

[Claims] 1. An inverter circuit module in which an inverter circuit for mutually converting DC power and AC power is housed in a case, and a pair of circuit terminals on the DC side of the inverter circuit are arranged on the surface of the case, and the inverter. A capacitor module in which a smoothing capacitor provided on the DC side of the circuit is housed in a case, and the capacitor module is integrally attached to the case of the capacitor module, and electrically connected to both terminals of the smoothing capacitor. A pair of first capacitor module terminals connected to each other, the capacitor module is disposed adjacent to the inverter circuit module, and the first capacitor module terminal is directly connected to the circuit terminal. Inverter device. 2. The inverter device according to claim 1, wherein the inverter circuit module stores a plurality of the inverter circuits, and the DC sides of the plurality of inverter circuits are connected in parallel to a common pair of the circuit terminals. Inverter device characterized by. 3. The inverter device according to claim 1, further comprising a DC power supply module that supplies the DC power from a pair of power supply terminals, wherein the capacitor module is integrated with a case of the capacitor module. And a second capacitor module terminal electrically connected to both terminals of the smoothing capacitor, wherein the capacitor module is disposed adjacent to the DC power supply module, and the second capacitor module is connected to the circuit terminal. An inverter device characterized in that the terminals are directly connected. 4. The inverter device according to claim 3, wherein the DC power supply module has a boosting reactor between a battery and the power supply terminal. 5. The inverter device according to claim 1, wherein the first capacitor module terminal and the circuit terminal are coupled to each other by co-fastening.