JP2008295238A - Power converter - Google Patents

Abstract

A power conversion device capable of reducing a power supply bus bar and miniaturizing the entire power conversion device by supplying a direct current to a power conversion semiconductor element from a DC power source through a capacitor bus bar. .
A pair of power supply bus bars having a pair of power supply connection terminals connected to a DC power source at one end, and a pair of capacitor bus bars connected to the other end of the power supply bus bar. And a smoothing capacitor module 4 having a plurality of capacitors 5 connected between the capacitor bus bars, and a DC current connected to the capacitor bus bar 6 and supplied from the DC power source through the capacitor bus bar 6 is an AC current. And a power conversion semiconductor module 9 having a plurality of power conversion semiconductor elements to be converted into
[Selection] Figure 1

Description

  The present invention relates to a power converter that converts a direct current supplied from a direct current power source into an alternating current.

Conventionally, a pair of power supply bus bars having a pair of power supply connection terminals connected to a DC power supply at one end, and a DC power supply connected to the other end of the power supply bus bar and supplied from the DC power supply There is known a power conversion device including a power conversion semiconductor module having a plurality of power conversion semiconductor elements that convert a current into an alternating current and a plurality of capacitors connected between the power supply bus bars (for example, Patent Document 1).
In order to improve the assembly efficiency of this power converter, instead of a plurality of capacitors, a smoothing capacitor module in which a plurality of capacitors are connected in parallel between a pair of capacitor bus bars is connected to the power supply bus bar. Conversion devices are known.

Japanese Patent No. 3819838

  However, in this case, the power supply bus bar is provided from the connection terminal for power supply to the power conversion semiconductor element, and it is necessary to provide an insulator between the power supply bus bars. There was a problem that it was.

  An object of the present invention is to solve the above-described problems, and an object of the present invention is to supply a direct current from a direct current power source to a power conversion semiconductor element through a capacitor bus bar. It is an object of the present invention to provide a power converter capable of reducing the supply bus bar and reducing the size of the entire power converter.

  Another object of the present invention is to supply a direct current to a power conversion semiconductor element from a direct current power source through a capacitor bus bar, thereby eliminating the need for a power supply bus bar and reducing the size of the entire power conversion device. A conversion device is provided.

  The power conversion device according to the present invention includes a pair of power supply bus bars having a pair of power connection terminals connected to a DC power source at one end, and a pair of power supply bus bars connected to the other end of the power supply bus bar. A smoothing capacitor module having a capacitor bus bar and a plurality of capacitors connected between the capacitor bus bars; and a DC current connected to the capacitor bus bar and supplied from the DC power source through the capacitor bus bar. And a power conversion semiconductor module having a plurality of power conversion semiconductor elements for converting into alternating current.

  In addition, the power conversion device according to the present invention has a pair of capacitor bus bars including a pair of power supply connection terminals connected to a DC power source at an end, and a plurality of capacitors connected between the capacitor bus bars. A smoothing capacitor module, and a power conversion semiconductor module having a plurality of power conversion semiconductor elements connected to the capacitor bus bar and converting a DC current supplied from the DC power source through the capacitor bus bar into an AC current; It has.

According to the power conversion device of the present invention, the DC power is supplied from the DC power source through the capacitor bus bar to the power conversion semiconductor element, thereby reducing or removing the power supply bus bar and reducing the size of the entire power conversion device. Can be
Further, according to the power conversion device of the present invention, by supplying a direct current from the DC power source through the capacitor bus bar to the power conversion semiconductor element, the power supply bus bar becomes unnecessary and the entire power conversion device is downsized. can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.
Embodiment 1 FIG.
1 is a plan view of the power converter according to Embodiment 1, FIG. 2 (a) is a front view of the anode power supply bus bar 1 of FIG. 1, and FIG. 2 (b) is a cathode power supply bus bar 2 of FIG. 2 (c) is a front view of the anode capacitor bus bar 7 of FIG. 1, FIG. 2 (d) is a front view of the cathode capacitor bus bar 8 of FIG. 1, and FIG. 3 is a diagram of the power converter of FIG. It is a circuit diagram.
The power conversion apparatus according to the first embodiment includes power comprising an anode power supply bus bar 1 connected to the anode of a DC power supply (not shown) and a cathode power supply bus bar 2 connected to the cathode of the DC power supply. A supply bus bar 3 is provided.
One end of the anode power supply bus bar 1 is provided with a power source side anode terminal 1a connected to the anode of the DC power source, and the other end is provided with a first anode terminal 7a of an anode capacitor bus bar 7 described later. The capacitor-side anode terminal 1b connected to is provided.
One end of the cathode power supply bus bar 2 is provided with a cathode terminal 2a on the power source side connected to the cathode of the DC power, and the other end is provided with a first cathode terminal 8a of a cathode capacitor bus bar 8 described later. The capacitor-side cathode terminal 2b connected to is provided.
The anode terminal 1a on the power supply side and the cathode terminal 2a on the power supply side are respectively formed with holes for electrical connection with the terminals of the DC power supply by screwing, and the anode terminal 1b on the capacitor side and the cathode terminal on the capacitor side In 2b, holes for electrical connection with the terminals of the capacitor bus bar 6 are formed by screws.

The power conversion device also includes a smoothing capacitor module 4 connected to the power supply bus bar 3.
The smoothing capacitor module 4 includes three capacitors 5 and a capacitor bus bar 6 in which the capacitors 5 are connected in parallel.
The capacitor bus bar 6 includes an anode capacitor bus bar 7 connected to the anode power supply bus bar 1 and a cathode capacitor bus bar 8 connected to the cathode power supply bus bar 2.
The anode capacitor bus bar 7 has a first anode terminal 7a, a second anode terminal 7b, and a third anode terminal 7c, which are arranged in parallel, and the first anode terminal 7a is an anode power supply bus bar. 1 is connected to the anode terminal 1b on the capacitor side.
The cathode capacitor bus bar 8 includes a first cathode terminal 8a, a second cathode terminal 8b, and a third cathode terminal 8c, which are arranged in parallel, and the first cathode terminal 8a is a cathode power supply bus bar. 2 is connected to the cathode terminal 2b on the capacitor side.
The first anode terminal 7a, the second anode terminal 7b, the third anode terminal 7c, the first cathode terminal 8a, the second cathode terminal 8b, and the third cathode terminal 8c will be described later with screws. A hole for electrical connection with the power conversion semiconductor module 9 is formed.

In addition, this power conversion device includes a power conversion semiconductor module 9 that is connected to the smoothing capacitor module 4 and converts a direct current supplied from a direct current power source into an alternating current.
The power conversion semiconductor module 9 includes a first power conversion semiconductor element 9a, a second power conversion semiconductor element 9b, and a third power conversion semiconductor element 9c configured by FETs and diodes.
The first power conversion semiconductor element 9a, the second power conversion semiconductor element 9b, and the third power conversion semiconductor element 9c are not limited to FETs. For example, elements that can switch current, such as IGBTs, are used. Also good.
The first power conversion semiconductor element 9a is provided with an anode terminal and a cathode terminal, and the first anode terminal 7a of the anode capacitor bus bar 7 is connected to the anode terminal of the first power conversion semiconductor element 9a. The first cathode terminal 8a of the cathode capacitor bus bar 8 is connected to the cathode terminal of the first power conversion semiconductor element 9a.
Similarly, the second power conversion semiconductor element 9b and the third power conversion semiconductor element 9c are connected to the anode capacitor bus bar 7 and the cathode capacitor bus bar 8.

Next, the operation of the power conversion device according to Embodiment 1 will be described.
The DC current input from the DC power source to the power supply bus bar 3 is transmitted to the capacitor bus bar 6, branched into three by the capacitor bus bar 6, and input to the power conversion semiconductor module 9.
In the power conversion semiconductor module 9, the FET is controlled by a control unit (not shown), converts a direct current into a three-phase alternating current, and outputs the alternating current to an electric motor (not shown).
At this time, the smoothing capacitor module 4 suppresses fluctuations in the voltage of the direct current due to the control of the FET.
As a result, it is possible to prevent the power conversion semiconductor module 9 from being destroyed due to fluctuations in direct current.

  As described above, according to the power conversion device according to the first embodiment, the power supply bus bar 3 connected to the DC power supply is connected to the capacitor bus bar 6, and the capacitor bus bar 6 is connected to the power conversion semiconductor module 9. Since the power supply bus bar 3 is reduced, the power converter can be downsized.

Embodiment 2. FIG.
FIG. 4 is a plan view of the power converter according to the second embodiment.
The power conversion device according to the second embodiment includes a capacitor bus bar 12 including an anode capacitor bus bar 10 connected to the anode of a DC power source and a cathode capacitor bus bar 11 connected to a cathode of the DC power source, and an anode capacitor bus bar. 10 and a capacitor module 13 having three capacitors 5 connected between the cathode capacitor bus bar 11.
The anode capacitor bus bar 10 includes a first anode terminal 10a, a second anode terminal 10b, and a third anode terminal 10c, which are arranged in parallel.
The cathode capacitor bus bar 11 has a first cathode terminal 11a, a second cathode terminal 11b, and a third cathode terminal 11c, which are arranged in parallel.
The first anode terminal 10a, the second anode terminal 10b, the third anode terminal 10c, the first cathode terminal 11a, the second cathode terminal 11b, and the third cathode terminal 11c are screwed to provide power conversion. A hole for electrical connection with the semiconductor module 9 is formed.
An anode terminal 14 connected to the anode of the DC power supply is provided at the end of the anode capacitor bus bar 10, and a cathode terminal 15 connected to the cathode of the DC power supply is provided at the end of the cathode capacitor bus bar 11. Yes.
Other configurations are the same as those of the first embodiment.

  According to the power conversion device according to the second embodiment, the capacitor bus bar 12 is connected to the DC power supply, and the capacitor bus bar 12 is connected to the power conversion semiconductor module 9, so that the power supply bus bar 3 is not required. The entire power conversion device can be reduced in size.

  In each of the above embodiments, the smoothing capacitor modules 4 and 13 having three capacitors 5 have been described. However, the number is not limited to this.

  In each of the above-described embodiments, the power conversion semiconductor module 9 including three power conversion semiconductor elements has been described, but the number is not limited to this.

1 is a plan view of a power conversion device according to a first embodiment. 2 (a) is a front view of the anode power supply bus bar of FIG. 1, FIG. 2 (b) is a front view of the cathode power supply bus bar of FIG. 1, and FIG. 2 (c) is an anode capacitor bus bar of FIG. FIG. 2D is a front view of the cathode capacitor bus bar of FIG. It is a circuit diagram of the power converter device of FIG. 6 is a plan view of a power conversion device according to a second embodiment. FIG.

Explanation of symbols

  1 Anode power supply bus bar, 1a anode terminal, 1b anode terminal, 2 cathode power supply bus bar, 2a cathode terminal, 2b cathode terminal, 3 power supply bus bar, 4 smoothing capacitor module, 5 capacitor, 6 capacitor bus bar, 7 Anode capacitor bus bar, 7a first anode terminal, 7b second anode terminal, 7c third anode terminal, 8 cathode capacitor bus bar, 8a first cathode terminal, 8b second cathode terminal, 8c third Cathode terminal, 9 Power conversion semiconductor module, 9a First power conversion semiconductor element, 9b Second power conversion semiconductor element, 9c Third power conversion semiconductor element, 10 Anode capacitor bus bar, 10a First anode terminal, 10b 2nd anode terminal, 10c 3rd anode terminal, 11 Bus bar for cathode capacitor, 11a 1st Terminal, 11b a second cathode terminal, 11c a third cathode terminal, busbar 12 capacitors, 13 the capacitor module, 14 anode terminal, 15 the cathode terminal.

Claims (2)

A pair of power supply busbars having a pair of power supply connection terminals connected to a DC power supply at one end;
A smoothing capacitor module having a pair of capacitor bus bars connected to the other end of the power supply bus bar and a plurality of capacitors connected between the capacitor bus bars;
A power conversion semiconductor module having a plurality of power conversion semiconductor elements connected to the capacitor bus bar and converting a DC current supplied from the DC power source through the capacitor bus bar into an AC current. A power converter. A smoothing capacitor module having a pair of capacitor bus bars including a pair of power supply connection terminals connected to a DC power source at an end, and a plurality of capacitors connected between the capacitor bus bars;
A power conversion semiconductor module having a plurality of power conversion semiconductor elements connected to the capacitor bus bar and converting a DC current supplied from the DC power source through the capacitor bus bar into an AC current. A power converter.

Images