WO2007115951A1

WO2007115951A1 - Power electronics subassembly, and switchgear cabinet comprising a power electronics subassembly

Info

Publication number: WO2007115951A1
Application number: PCT/EP2007/053103
Authority: WO
Inventors: Bernd Bormuth
Original assignee: Baumüller Nürnberg GmbH
Priority date: 2006-04-07
Filing date: 2007-03-30
Publication date: 2007-10-18
Also published as: DE202006008138U1

Abstract

Disclosed is a power electronics subassembly, especially to be incorporated into a switchgear cabinet which is equipped with busbars for electrically contacting the power electronics subassembly. The inventive power electronics subassembly comprises at least one power semiconductor component and a connecting element. The power electronics subassembly and/or the at least one power semiconductor component is/are electrically contacted by means of the connecting element that is embodied as an aluminum rail (6a, 6b, 10, 11, 12).

Description

POWER ELECTRONIC ASSEMBLY AND CONTROL CABINET WITH L

EISTUNGSELEKTRONIKBAUGRUPPE

The invention relates to a power electronics module, such as current or inverter, in particular for installation in a control cabinet, wherein the cabinet cabinet manifolds for electrical contacting of the power electronics module, wherein the power electronics module has at least one power semiconductor device and a connecting element and wherein the power electronics module and / or the at least a power semiconductor device is or are electrically contacted by means of the connecting element, and a control cabinet with the power electronics module.

The construction of cabinets for low-voltage systems has in recent years

Decades have gone from an individual assembly for each application to a modular design using available functional assemblies. So it is customary in the meantime to use the required function modules in a few simple steps in prefabricated cabinets or replace if necessary. The control cabinets have for this purpose on the one hand on mechanical interfaces for receiving the functional modules and on the other electrical interfaces for electrical contacting of the functional modules. The electrical interfaces of the control cabinets are usually designed as a cabinet busbars and firmly integrated in the control cabinets.

For example, the publication DE 3502864 Al discloses a device for blunt electrical connection of busbars of a busbar system, as used in conventional control cabinets. In this document, it is also mentioned that such busbars may be formed as aluminum busbars.

This Hee to use for busbars in low-voltage cabinets the material aluminum or corresponding alloys is not first voiced in the above-mentioned document. Thus, in the article by H. Kock: "Tracks in low-voltage distribution of aluminum" in DE-Z: "The master electrician" 18/70, p 973 - 975 the advantages and disadvantages of using the material aluminum at Busbars for low-voltage cabinets discussed in detail and, inter alia, proposed to galvanize the aluminum busbars in connectors. Suitable for installation in the control cabinets functional modules, among other converters are common, which usually have a plurality of semiconductor devices, which are interconnected by means of copper compounds. Such power converters are probably the closest prior art.

The problem underlying the invention is known

Further develop power electronics modules or cabinets so that the production costs are reduced. This problem is solved by a power electronics module having the features of patent claim 1 and with a control cabinet having the features of patent claim 11, the subclaims relate to preferred embodiments.

The power electronics module is preferably formed as a modular unit which is mounted in particular in the assembled state in its entirety and / or disassembled. The power electronics module is for installation or assembly in a control cabinet, in particular in one

Low-voltage switchgear cabinet, suitable and / or designed. The control cabinet comprises cabinet busbars for electrically contacting the power electronics module and preferably provides mechanical interfaces for receiving the power electronics module and / or electrical interfaces for contacting the power electronics module. The cabinet busbars thus form a distribution system, which is assigned to the cabinet.

The power electronics module comprises at least one power semiconductor component, wherein preferably the one or more power semiconductor components for switching and / or directing low voltages of up to 600 V, preferably up to 1,000 V, in particular up to 3,000 V and / or currents of up to 500 A, preferably up to 1300 A, in particular up to 6000 A are formed. In addition, at least one connecting element is provided in the power electronics module, which electrically contacts the power semiconductor component and / or the power electronics module.

According to the invention it is provided that the connecting element as

Aluminum rail is formed. The term aluminum rail is preferably to be understood as meaning a rail made of pure technical aluminum and / or an aluminum alloy, the percentage by weight of the aluminum in the alloy being at least 30 percent, preferably at least 50 Percent, in particular at least 80 percent and / or in the technical grade aluminum is more than 95%.

Significant advantages of the invention lie in the price advantage of aluminum rails against copper rails and in the simpler and cheaper processing of aluminum rails. Another advantage is the weight reduction, since the specific density of the material is significantly lower for aluminum rails than for copper rails. Surprisingly, it has also been found that the drawbacks discussed in the prior art, such as the flow of aluminum or the necessity of greasing the contact points, are less important than the economic and technical advantages achieved.

In a particularly preferred embodiment, the aluminum rail is tinned, in particular galvanically tinned, hot tinned, wiped tin or electrolytically tinned. This embodiment leads to the advantages that on the one hand, the electrical contact resistance to connection points in the contacting of the aluminum rail is lower and more defined than in the previously used copper rails and the second occurring tolerances of the electrical contact resistance to the copper rail variant are reduced. This preferred embodiment thus provides a power electronics module with connecting elements which are of higher value than the connecting elements known from the prior art. In less preferred embodiments, the aluminum rail has another additionally applied cover layer of any metallic material and is, for example, galvanized.

In a further preferred embodiment are in the

Power electronics module provided at least two power semiconductor devices, which are electrically conductively connected to each other by means of a preferably one-piece busbar and / or electrically connected and / or connected in parallel, wherein the busbar is designed as the aluminum rail according to the invention. In particular, in a development of the invention, said busbar and / or the connecting element with one of the cabinet busbars is electrically connected and / or connected. These designs again underline the inventive Hee to use integrated aluminum rails in a power electronics module and thus not limit their use on the control cabinets.

In a further embodiment it is provided that a connection plate at least one power semiconductor component or the

Power semiconductor device associated heat sink directly and / or directly, that is, in particular without the interposition of other electrical functional parts and / or line elements, mechanically and / or electrically contacted and that the connection plate is designed as an aluminum rail. It is preferably provided that an aluminum rail according to the invention is used in the power electronics module for several, even different connecting elements. Preferably, the connection plate can be connected and / or connected to one of the cabinet busbars via any bus bar or the busbar designed as an aluminum rail.

In the physical embodiment, the aluminum rail is preferably as a particular curved and / or angled sheet metal profile, preferably with a thickness of up to 3 mm, in particular up to 6 mm, and / or as a solid rail, preferably with a thickness up to 10 mm and / or up to 15 mm.

Preferably, the aluminum rail over the entire surface and / or tinned substantially over the entire surface, and in particular on the top or the top, which include the electrical contact surfaces used in the operation. Alternatively, the aluminum rail is only locally tinned and preferably at the used contact surfaces.

The power electronics module is preferably designed as a power converter, in particular as a rectifier, inverter or inverter. In particular, in the embodiment as a power converter, the power electronics module comprises one or more AC busbars and / or one or more DC busbars, wherein one, some or all of said rails is or are designed as aluminum rail according to the invention. The said rail are each arranged and / or formed, so that a plurality of the power semiconductor components are electrically connected together within the power electronics module and / or bridged and / or connected in parallel.

Furthermore, the invention relates to a control cabinet, in particular a switchgear preferably for a printing press, with the features of claim 11. It is preferably provided that the power electronics assembly described above in their entirety as a module in the cabinet, preferably also as described above is realized, assembled and / or dismountable formed. Further advantages and features of the invention will become apparent from the following description of preferred embodiments, in particular in conjunction with the accompanying drawings. Showing:

Fig. 1 shows a power converter in a schematic 3D representation as a first embodiment of the invention;

Fig. 2 shows the power converter in Figure 1 in a schematic 3D representation with an alternative embodiment of the busbars.

The same reference numerals are assigned to the same or corresponding components in the figures.

1 shows a power electronics module in the form of a power converter 1, which is designed for a current of about 2000 to 5000 A. Preferably, the power converter 1 is designed for installation in a control cabinet, in particular a switchgear for printing presses, in which the power converter 1 can be mounted and dismounted as a module in its entirety. The power converter 1 comprises a plurality of concealed thyristors 2, which are arranged alternately with heat sinks 3 in two towers 4 a and 4 b, wherein the thyristors 2 are formed as a disk thyristors. To ensure a sufficient electrical contact between the heat sinks 3 and the thyristors 2 for each tower 4 a and 4 b respectively a jig 5 a and 5 b is provided which compresses the tower 4 a and 4 b in the longitudinal direction.

For electrical parallel connection of the DC-side contacts of the thyristors 2 of a tower 4 a, b is provided for each tower 4 a and 4 b each have a DC bus 6 a and 6 b. The DC busbar 6 a and 6 b is respectively formed as a tinned aluminum rail, which in this embodiment alternately planar areas 7 a and b and arcuate portions 8 a and 8 b and parallel to the longitudinal extent of the towers 4a and 4b. The planar areas 7 a and 7 b have through holes 9 a and 9 b, by means of which the DC busbar 6 a and 6 b can be mechanically and electrically connected via a screw connection with connecting plates, not shown, in particular the undersides of the planar regions 7a and b are formed as electrical contact surfaces to the connection plates. The terminal plates, not shown, are used for electrical contacting of the thyristors 2 with the DC bus 6 a and 6 b and may also be formed as aluminum rails and / or tin-plated aluminum rails. The connection plates are preferably in direct mechanical contact with the thyristors 2, alternatively, in each case between the connection plate and the thyristor 2, a heat sink 3 is interposed as an electrically conductive element.

Perpendicular to the longitudinal extent of the towers 4a and 4b and offset from each other in parallel three AC busbars 10, 11 and 12 are arranged. The AC ammeischienen 10, 11 and 12 are formed as an L-shaped, tinned aluminum angle, wherein each of the short leg of the AC ammeischiene 10, 11 or 12 is formed for contacting a cabinet busbar or another cabinet-side contact element and cantilevered. The respective long leg of the alternating current busbar 10, 11 or 12 connects and / or bridges two fuse elements F11-F14, F13-F16 and F15-F12, wherein the fuse elements F1, F1, F13, F14, F15 and F1 the

AC busbars 10, 11 or 12 are connected to AC-side contacts of the thyristors 2. The AC busbars 10, 11 and 12 are mechanically and electrically connected via screw to the respective fuse elements FI l, F12, F13, F14, F15 or F16.

Figure 2 shows the same power converter 1 as in Figure 1 with the difference that the AC busbars 10, 11 and 12 are mounted so that the short legs are not aligned as in Figure 1 to the right but to the left.

LIST OF REFERENCES:

[0027] 1 power converter

2 thyristor

[0029] 3 cooling bodies

4a, b towers

5 a, b clamping devices

6a, b DC busbars

7a, b show planar areas of the DC busbars

8a, b arcuate portions of the DC busbars

9a, b through holes

10, 11, 12 AC busbars

Claims

claims

Leistungselektronilώaugruppe (1), in particular for installation in a

Control cabinet, wherein the control cabinet has cabinet busbars for electrically contacting the power electronics module, wherein the power electronics module (1) at least one power semiconductor component (2) and a connecting element (6a, 6b, 10, 11, 12) and wherein the power electronics module (1) and / or the at least one power semiconductor component (2) is / are electrically contacted by means of the connecting element (6a, 6b, 10, 11, 12), characterized in that the connecting element is designed as an aluminum rail (6a, 6b, 10, 11, 12).

Leistungselektronilώaugruppe (1) according to claim 1, characterized in that the aluminum rail (6a, 6b, 10, 11, 12) is tinned.

Leistungselektronilώaugruppe (1) according to claim 1, characterized in that the aluminum rail (6a, 6b, 10, 11, 12) is galvanized.

Leistungselektronilώaugruppe (1) according to claim 1, 2 or 3, characterized by at least two power semiconductor components (2) by means of a busbar (6a, 6b, 10, 11, 12) are electrically connected to each other, wherein the busbar (6a , 6b, 10, 11, 12) is formed as the aluminum rail.

Leistungselektronilώaugruppe (1) according to any one of the preceding claims, characterized in that the rail formed as an aluminum rail (6a, 6b, 10, 11, 12) and / or the connecting element (6a, 6b, 10, 11, 12) one of the cabinet busbars connectable and / or connected.

Leistungselektronilώaugruppe (1) according to any one of the preceding claims, characterized by a connection plate, which the power semiconductor component (2) and / or a the

Power semiconductor device (2) associated with the heat sink (3) contacted directly and / or directly electrically, wherein the connection plate is formed as the or a further aluminum rail.

Leistungselektronilώaugruppe (1) according to claim 6, characterized in that the aluminum rail formed as a connection plate via one or the formed as an aluminum rail busbar (6a, 6b, 10, 11, 12) with one of the cabinet busbars connectable and / or is connected.

Leistungselektronilώaugruppe (1) according to one of the preceding claims, characterized in that the aluminum rail (6a, 6b, 10, 11, 12) is designed as a bent sheet metal profile or solid rail.

Leistungselektronilώaugruppe (1) according to one of the preceding claims, characterized in that the aluminum rail (6a, 6b, 10, 11, 12) vollfiächig or locally tinned and / or galvanized.

Leistungselektronilώaugruppe (1) according to claim 9, characterized by a

Tinning or galvanizing selementen only in the overlap and / or transition region of the aluminum rail with or to further busbars or Strom- Anschlus.

Leistungselektronilώaugruppe (1) according to one of the preceding claims, characterized by a design as a converter or converter (1).

Leistungselektronilώaugruppe according to any one of the preceding claims, characterized in that an AC busbar (10, 11, 12) and / or a Qeichstromsammelschiene (6a, b) is designed as aluminum rail or are a plurality of power semiconductor devices (2) within the power electronics assembly (1) electrically interconnects.

Leistungselektronilώaugruppe according to any one of the preceding claims, characterized in that the aluminum rail (6a, 6b, 10, 11, 12) is in operative connection with a parallel connection of power electronics semiconductor devices.

Control cabinet characterized by a power electronics module (1) having the features of one of claims 1 to 10.