JP2001238468A - Main circuit structure of power converter for electric vehicles - Google Patents

Abstract

(57) [Problem] To provide a power converter for an electric vehicle that facilitates assembling work and replacement work when an element is destroyed, and further improves cooling efficiency. SOLUTION: Rated voltage 3000V or more, rated current 12
In a power converter for an electric vehicle, which converts a direct current into an alternating current using a plurality of semiconductor modules of 00 A or more, or performs the reverse conversion, an electric power on the other surface of one heat block 2 having a radiation fin 1 attached to one surface. Over the direction of travel,
Semiconductor units 3U, 3 having the conversion function for each phase
V, 3W, a plurality of semiconductor units are mounted on a substrate having at least a mounting means on a heat block.
The structure is such that the semiconductor modules of the negative arm are arranged side by side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power converter using a semiconductor module, and more particularly to a main circuit structure of a power converter for an electric vehicle suitable for an electric vehicle.

[0002]

2. Description of the Related Art Conventionally, as a main circuit structure of a power converter using a semiconductor module, for example, JP-A-5-83957.
There is an example described in Japanese Patent Publication No. This is a semiconductor module,
The snubber circuit, the filter capacitor on the AC power supply side, and the radiating fins that release the heat generated by the semiconductor module are integrally wired for each phase and housed in the same box, and the input / output terminals are pulled out of the box and mounted. . Thereby, the efficiency of the wiring work and the reduction of the wiring inductance are achieved. In the example described in Japanese Patent Application Laid-Open No. H11-8982, a heat receiving plate, a semiconductor module attached to a cooling device, and a snubber circuit, which are components of a power converter, are wired for each phase to form a unit for maintenance. The aim is to ensure ease.

[0003]

However, when the device is assembled for an electric vehicle according to the above-mentioned prior art, since the coolers are individually divided for each phase, the way of hitting the wind differs depending on the traveling direction. As a result, there arises a problem that a variation in heat radiation occurs and a difference occurs in the temperature distribution.

[0004] It is an object of the present invention to facilitate the assembling work and the replacing work when the element is destroyed in a power converter for electric vehicles, and to further improve the cooling efficiency.

[0005]

In order to solve the above-mentioned problems, in a power converter for an electric vehicle, a positive-side / negative-side arm semiconductor module for one phase is mounted on a substrate having good heat conductivity.
A plurality of semiconductor units integrated with a bus bar are attached to one heat block in the traveling direction of the electric vehicle.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a three-phase power converter for an electric vehicle, showing one embodiment of the present invention. In FIG. 1, 1 is a radiation fin, 2 is a heat block, 3U, 3
V, 3W are semiconductor units, 4 is semiconductor unit 3U,
3 V, 3 W are mounting screws for mounting to the heat block 2. One heat block 2 is provided with radiating fins 1 on one surface, and U, V, W-phase semiconductor units 3U, 3V, 3W unitized for each phase over the electric vehicle traveling direction on the other surface. Attach with the mounting screw 4.

FIGS. 2 and 3 show a semiconductor unit for one phase of the embodiment shown in FIG. 1, FIG. 2 is a perspective view thereof, and FIG. 3 is a side view. In the semiconductor unit for one phase, the positive arm semiconductor module 6a and the negative arm semiconductor module 6b are mounted on a substrate 5 having good heat conductivity and having a mounting hole 10 for mounting on the heat block 2. A flat-side positive conductor 7 (hereinafter, referred to as a busbar P) having a collector terminal 11a and an external connection terminal.
Called. ) To connect the positive side arm semiconductor module 6
The emitter terminal 12a of the negative arm semiconductor module 6b is connected to the collector terminal 11b of the negative arm semiconductor module 6b by a flat AC output conductor 8 (hereinafter, referred to as a bus bar U) having a connection terminal with the outside.
And a flat negative conductor 9 (hereinafter, referred to as a bus bar N) having an emitter terminal 12b and a connection terminal to the outside. Here, the bus bar P, the bus bar U, and the bus bar N are arranged in a hierarchical manner to reduce the inductance.
Although not shown, bus bar P7, bus bar N8
Is provided with a connection terminal to the outside, and a filter capacitor which is a DC source is connected to this terminal end, not shown,
An AC load is connected to an external connection terminal provided on the bus bar U8.

The power converter of the present invention has a large capacity as a converter because it is applied to a drive system of an electric vehicle. As the semiconductor module, an IGBT which is a self-extinguishing element is used, and its rating is a voltage of 3000 V or more and a current of 1200 A or more. In such a large-capacitance device, it is necessary to reduce the inductance of the wiring connecting the semiconductor modules as much as possible. Therefore, in this embodiment, a flat bus bar is used, and the bus bars are hierarchically arranged to further reduce the mutual inductance. Configuration.

In the present embodiment, a plurality of semiconductor units, which are unitized for each phase, are mounted on one heat block in the direction of travel of the electric vehicle by mounting screws. Is easy. Further, by attaching a plurality of semiconductor units to one heat block, the heat radiation of each phase becomes uniform, and the cooling efficiency can be improved.

The power converter described in the above embodiment is applied to a power converter for an electric vehicle of each company provided with an inverter for converting DC to AC or a converter for converting AC to DC. The effect of can be fully exhibited.

[0011]

As described above, according to the present invention,
A plurality of semiconductor units unitized for each phase are attached to one heat block in the direction of travel of the electric vehicle by mounting screws, so that an assembling operation and an exchanging operation when the element is destroyed are easy. Further, by attaching a plurality of semiconductor units to one heat block, the heat radiation of each phase becomes uniform, and the cooling efficiency can be improved. In addition, since a flat bus bar is used for the wiring connecting the semiconductor modules, and the bus bar has a hierarchical configuration, the inductance can be reduced, and
Mutual inductance can be further reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric vehicle power converter showing one embodiment of the present invention.

FIG. 2 is a perspective view of a semiconductor unit for one phase showing one embodiment of the present invention.

FIG. 3 is a side view of a semiconductor unit for one phase showing one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat radiation fin, 2 ... Heat block, 3U, 3V, 3
W: semiconductor unit, 4: mounting screw, 5: substrate, 6a,
6b semiconductor module, 7 positive conductor, 8 AC output conductor, 9 negative conductor, 10 mounting hole

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Satoshi Inarida 1070 Ma, Hitachinaka-shi, Ibaraki F-term in Mito Works, Hitachi, Ltd. F-term (reference) 5H007 BB06 CC23 HA03 HA05 HA07

Claims (2)

[Claims] An electric vehicle power converter for converting DC to AC or vice versa by using a plurality of large-capacity semiconductor modules having a high rated voltage and a high rated current. Attaching a plurality of semiconductor units having the conversion function for each phase over the electric vehicle traveling direction on the other surface of one heat block with
The main circuit structure of a power converter for an electric vehicle, wherein the semiconductor unit is configured by arranging semiconductor modules of a positive side and a negative side side by side on a substrate having at least a mounting means on the heat block. 2. The electric vehicle according to claim 1, wherein the collector and emitter terminals of each of the semiconductor modules are connected to a plurality of flat bus bars having connection terminals with the outside arranged hierarchically. Main circuit structure of power converter.