Electric power conversion device for railway vehicles

Abstract

To reduce the size and weight of a railway vehicle power conversion device by reducing structural members for fixing a gate substrate constituting the vehicle power conversion device.SOLUTION: A railway vehicle power conversion device includes a switching element, a capacitor connected to the switching element, and a gate substrate that gives a driving signal to the switching element. The capacitor is fixed with a capacitor fixing frame, and the gate substrate is fixed by being attached to the capacitor.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a power conversion device for railway vehicles.

Background Art

[0002] In a power unit section of a power conversion device for railway vehicles, which mounts switching elements, in addition to the switching elements, it is composed of a cooler, conductors, capacitors, and a gate board. The switching element is arranged on the cooler and is cooled by contact of its bottom surface with the cooler. On the upper surface of the switching element, a main terminal and a gate terminal are provided, and a capacitor for suppressing the ripple current generated by switching and a gate board for applying a gate signal to the switching element are connected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, there has been a demand for miniaturization of power conversion devices for vehicles. Regarding switching elements, the adoption of wide bandgap semiconductors has enabled miniaturization by having withstand voltage properties, and has also contributed to the miniaturization of the cooler from the heat generation surface. On the other hand, regarding structural members such as sheet metal, no major changes have been made, and it is possible to achieve miniaturization and weight reduction by reducing the structural members.

[0005] In order to solve the above problems, an embodiment of the present invention aims to reduce the sheet metal components by attaching the gate board to the capacitor, thereby realizing miniaturization and weight reduction of the power conversion device for vehicles.

Means for Solving the Problems

[0006] The power conversion device for railway vehicles according to the embodiment is Switching module provided with a switching element, a cooler disposed in contact with the bottom surface of the switching module, a capacitor fixing frame installed on the cooler and installed to cover the switching module, a capacitor fixed on the capacitor fixing frame and connected to the switching element, a gate board attached to one surface of the capacitor without using a frame, disposed close to the switching module, and applying a gate signal to the drive terminal of the switching module. And a cooler disposed in contact with the bottom surface of the switching module, A capacitor fixing frame installed on the cooler and installed to cover the switching module, A capacitor fixed on the capacitor fixing frame and connected to the switching element, A capacitor attached to one surface of the capacitor without using a frame, disposed close to the switching module, And a gate board applying a gate signal to the drive terminal of the switching module. It has.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is the 1 embodiment of the railway configuration diagram of the power conversion device for vehicles, and FIG. 2 is the 1 embodiment cross-sectional view of the power conversion device for railway vehicles according to the embodiment, and FIG. 3 is the 1 top view of the power conversion device for railway vehicles according to the embodiment. In FIG. 3, a plurality of power conversion devices for railway vehicles shown in FIG. 1 are arranged side by side. The power conversion device for railway vehicles includes a switching module 1, a capacitor 2, a conductor 3 , a gate substrate 4, a cooler 5, and a capacitor fixing frame 6.

[0009] ​The switching module 1 constitutes a power conversion device such as an inverter that converts the input DC power into AC power, or a converter that converts the input AC power into DC power. The switching module 1 may be configured to include a switching element and a diode connected in anti-parallel to the switching element. Further, it may be configured to include a switching element, a diode, etc. for one phase of the power conversion device. The capacitor 2 is connected to the switching module 1 via the conductor 3, and suppresses the ripple current generated by the switching of the switching module 1. The gate substrate 4 is connected to the drive terminals of the switching module 1 by a signal line (not shown) to apply a gate signal. The cooler 5 is arranged such that the switching module 1 is in contact with the bottom surface thereof, and cools the switching module. The capacitor fixing frame 6 is installed on the cooler 5 to fix the capacitor 2. Here, the capacitor fixing frame 6 is installed so as to cover the switching module 1, and the capacitor 2 is installed above the switching module 1.

[0010] The gate substrate 4 is attached to one surface of the capacitor 2. In FIG. 1 , the gate substrate 4 is attached to the surface opposite to the conductor 3 , but the gate substrate 4 may be attached to any surface of the capacitor. Here, the attachment of the gate substrate 4 in a general power conversion device will be described. General In a general power conversion device, a dedicated frame (sheet metal) for attaching the gate substrate 4 is often provided for the gate substrate 4. Generally, the switching module 1 and the capacitor 2 are at high voltage, while the gate substrate is at relatively low voltage, so they are separated and handled separately. Also, when the switching module 1 fails or the gate substrate 4 fails, each can be easily replaced individually. , also, by arranging the switching module 1 and the gate substrate 4 in close proximity, reasons such as reducing the influence of noise can be considered. However, from the perspective of weight reduction and miniaturization, a dedicated frame for fixing the gate substrate 4 is required, resulting in an increase in structural members. Although there are reasons such as reducing the influence of noise, from the perspective of weight reduction and miniaturization, a dedicated frame for fixing the gate substrate 4 is required, resulting in an increase in structural members. For fixing, a dedicated frame is required, leading to an increase in structural members.

[0011] In contrast, in the present embodiment, by attaching the gate substrate 4 to one surface of the capacitor 2, a dedicated frame for attaching the gate substrate 4 is no longer necessary, and it becomes possible to achieve weight reduction and miniaturization. Also, since the capacitor 2 is not a source of generation such as harmonic noise, it does not have an impact on the attached gate substrate 4 that inhibits its function. Also, as shown in FIG. 3, by configuring the switching module 1, the capacitor 2, the gate substrate 4, etc. into one unit, for example, one power conversion device or one phase constituting one power conversion device, it becomes possible to facilitate replacement in each unit.

[0012] As described above, several embodiments of the present invention have been explained. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention.

Explanation of Reference Numerals

[0013] 1 Switching module 2 Capacitor 3 Conductor 4 Gate substrate 5 Cooler 6 Capacitor fixing frame

Claims

1. A switching module provided with a switching element, a cooler disposed in contact with the bottom surface of the switching module, a capacitor fixing frame installed on the cooler and configured to cover the switching module, a capacitor fixed on the capacitor fixing frame and connected to the switching element, a gate substrate attached to one surface of the capacitor without using a frame, disposed in proximity to the switching module, and configured to supply a gate signal to a drive terminal of the switching module, and a power conversion device for a railway vehicle having the same.

2. The switching element, the capacitor, the gate substrate, and the capacitor fixing frame are configured as one unit as one phase, and a plurality of units are installed on the cooler. The power conversion device for a railway vehicle according to Claim 1. ​

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