AT521041A4 - Power module with bulkhead - Google Patents

Abstract

The invention relates to a power module (1) for a medium or high voltage converter (2), preferably a modular multilevel converter, comprising at least one power semiconductor module (5), at least one energy storage module (4), at least one cooling device ( 3), at least one auxiliary subassembly (6), which has at least one signal conditioning subassembly (8), wherein the at least one power semiconductor subassembly (5) and the at least one auxiliary subassembly (6) in the vertical direction (14) are respectively connected to an upper ( 10) o- the underside (11) of the substantially horizontally oriented cooling device (3) are arranged, and the at least one power semiconductor assembly (5) in a power semiconductor section (15) and the at least one auxiliary subassembly (6) in a subsection (16) within one with the cooling device (3) connected, preferably integrally formed, protective housing (21) are arranged, - for explosion protection at least a, preferably at least in the vertical direction (14) composed of a plurality of bulkhead elements (17), bulkhead (7) between the cooling device (3) and the protective housing (21) is formed, and the at least one bulkhead (7) at least one Any busbars (18) and / or control lines (19) and / or measuring lines (20) form complementary passage opening (23).

Description

The invention relates to a power module for a medium or high voltage converter, preferably a modular multilevel converter, with improved explosion protection.

In the medium or high voltage direct current transmission, the conversion of three-phase current into direct current or vice versa takes place. Inverters (or Modular Multilevel Converter-MMC) are often used. Such modular multilevel inverters generally consist of a large number of power modules connected in series, which can also be referred to as submodules. Each power module can be switched independently of the other power modules.

The power modules subjected to medium or high voltage usually comprise at least one power semiconductor module, at least one energy storage module, at least one cooling device, and at least one auxiliary module, which has at least one signal conditioning module. Often several power assemblies are arranged in a rack or rack, one above the other and / or next to each other where low volume and minimization of costs and ensuring the insulation requirements by the expert must be considered.

During operation of a medium or high voltage converter, the failure of a component, such as a power semiconductor, may cause the component to explode due to the momentarily high electrical currents and / or power levels that occur. This can lead to the formation of an atmospheric and / or metallic plasma, as well as splintering and dust. Furthermore

N2018 / 09400-AT-00/34 releases a very high gas pressure during the explosion. This may result in damage to the components of the damaged power assembly or damage nearby adjacent power assemblies. In the worst case, such an explosion endangers the safety of the environment, in particular of any plant operator present.

A number of protective measures on submodules or power modules are known to the person skilled in the art in order to increase the safety for systems and operators.

For example, WO2017108104A1 is cited, which has a sealing element between two superimposed housing parts. The sealing element should prevent the escape of the gas pressure between the pressed-apart housing parts in the event of an explosion.

In WO2016165843A1 a standing arrangement of a plurality of semiconductor chips is presented, which are embedded between two cooling devices in an insulator material and these modules are arranged on a capacitor unit. The spaces between the cooling devices can be filled with an explosion-proof material.

In a known manner, thus, although the spread of the gas pressure relative to the environment of the sub-module can be improved, but is to be expected with a complete destruction of the internally arranged components. Moreover, the known measures for explosion protection are very complex and therefore expensive to implement.

The object of the present invention was to overcome the disadvantages of the prior art and to provide a power assembly which achieves a relatively simple, safe and efficient explosion protection of the environment, as well as sensitive electronic components within the affected power assembly.

This object is achieved by an apparatus and a method according to the claims.

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The power module according to the invention for a medium or high voltage converter, preferably a modular multilevel converter, comprises, at least one power semiconductor module, at least one energy storage module, at least one cooling device, at least one auxiliary module having at least one signal conditioning module. The at least one power semiconductor module and the at least one auxiliary subassembly are arranged in the vertical direction on each upper or lower side of the substantially horizontally oriented cooling device, and the at least one power semiconductor subassembly in a power semiconductor section and the at least one subassembly within a subsection connected to the cooling device , preferably integrally formed, protective housing arranged. In this case, at least one, preferably at least in the vertical direction composed of several bulkhead elements, bulkhead between the cooling device and the protective housing is designed for explosion protection, and the at least one bulkhead has at least one to any busbars and / or control lines and / or measuring lines form complementary through hole.

In the context of the present invention, explosion protection means the protection against the effects of an explosion in the power semiconductor section and no direct protection or preventive measure against any possible explosion itself.

The subassembly may comprise a plurality of components, such as a signal conditioning module, overvoltage protection, any bypass circuits with a separate control device, or even multiple power supplies.

The signal conditioning module can be understood as a particularly "sensitive" and thus worth protecting area of the auxiliary module, since it represents a kind of "electronic brain" of the power module. The signal conditioning assembly may be used in addition to lightwave controlled elements e.g. a short-circuit logic module for plausibility of the drive signals to the power module also include any downstream gate driver.

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Due to the "horizontal" arrangement of the power semiconductor module and the auxiliary module on one side, as well as the energy storage module on the opposite side of the cooling device, a very space-saving arrangement can be achieved. The cooling device is preferably designed to flow through liquid. The overall height of the power module is thus relatively low in the vertical direction in comparison to known, "standing" so in the vertical direction one above the other or successively arranged power semiconductor modules and energy storage modules. Thus, a plurality of power assemblies with "horizontally" arranged components can be arranged in a rack above one another and / or next to one another in a simple manner and, in addition, a comparatively stable bearing can be achieved. As a further advantage of this arrangement, the cooling device in the vertical direction can develop a protective function of the individual components with each other. Further, the horizontal arrangement of the power assembly provides good accessibility for an operator from the front of the medium or high voltage converter, especially when the connections for coolant, power, control and the like are formed on the front side.

To protect the auxiliary subassembly in the event of an explosion of at least one power semiconductor or power semiconductor module, the at least one, preferably one-piece, protective housing and / or the energy storage housing is formed as one side, in the direction of the cooling device, open hollow body. Over and / or laterally arranged power assemblies can be efficiently protected by the at least one protective housing.

By separating the power semiconductor section and the minor section by forming the bulkhead, gas entry into the bypass section can be efficiently reduced or even avoided altogether. The at least one through-hole may provide efficient protection of the subassembly from explosion propagating flying parts and / or superatmospheric gas pressure through the complementary shape of any busbars and the like. Moreover, an increase in environmental safety, in particular operator safety, is achieved by such a bulkhead in the direction of the front side.

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Furthermore, it may be expedient if the at least one energy storage module is arranged on the upper or lower side of the cooling device opposite the at least one power semiconductor module, preferably within an energy storage housing. The cooling device is designed as a load-bearing cooling plate.

Depending on the design and type of medium or high voltage converter, it may be advantageous to arrange at least one power semiconductor module on one side, such as the top, the cooling plate and the at least one energy storage assembly on the opposite side, such as the bottom, to arrange the cooling plate , Further arrangements, each with at least partially arranged on the top and bottom of the cooling plate components are in the design freedom of the designer and can also be realized with the platform assembly according to the invention on the cooling plate. It is in any case of great advantage that the cooling plate is arranged centrally in such a way that the heat emitted can be dissipated efficiently at least the energy storage and power semiconductor module.

Power modules of medium and high voltage converters generally have a very high dead weight of more than 200 kg. The majority of the total weight is the energy storage module. This advantageous arrangement of the energy storage module at the bottom of a very low center of gravity of the power assembly is achieved. This avoids an undesirable tilting moment compared to known arrangements and thus increases user safety.

Furthermore, it can be provided that the bulkhead comprises at least two vertically above one another and / or in the transverse direction juxtaposed, electrically non-conductive, bulkhead elements.

Such a structure of the bulkhead can facilitate the adaptation to different protective housing and / or component arrangements to optimize the protective function. The bulkhead elements can thus be block-shaped and thus standing and / or preferably layer-shaped and thus lying

N2018 / 09400-AT-00/34 and their respective predeterminable shape for forming the at least one complementary shape passage opening of the bulkhead to be cooperating with each other.

In addition, it can be provided that at least two of the bulkhead elements at least partially in the transverse direction and / or longitudinal direction and / or vertical direction complementary complementary recesses for at least partially receiving the busbars and / or any control lines and / or measuring lines.

This measure facilitates the implementation of fasteners through the bulkhead and thus provides a simple way to form the through holes. The recesses need not necessarily the individual bulkhead elements are formed penetrating straight in a spatial direction, but may preferably in transverse, vertical and / or Longitudinally angled or stepped. As a result, any bus bars to be performed and / or any control lines and / or measuring lines are at least partially taken up by the respective recess and wedged within the bulkhead in the event of an explosion. This can significantly increase the security against gas leakage and / or pushing out of the respective connecting elements.

It is also conceivable that e.g. the busbars make up an integral part of the bulkhead, since they are taken up by the recesses at least partially ummantelnd.

Also advantageous is an embodiment, according to which it can be provided that at least one support element, preferably a plurality of support elements, on the protective housing in the transverse direction and / or vertical direction, preferably circumferentially, for supporting the at least one bulkhead and / or at least one bulkhead element in the longitudinal direction of the power semiconductor section pioneering under load by gas pressure in the event of an explosion, is formed.

Such support elements may be used as e.g. be arranged as an angle, or strip-shaped stop on the inside of the protective housing and support the bulkhead at least partially in the transverse direction and / or vertical direction. Prefers

N2018 / 09400-AT-00/34 the bulkhead is supported on both sides in the longitudinal direction by support elements, whereby the stability or rigidity of the bulkhead can be further increased. Such a support element thus serves to increase safety in the event of an explosion and can prevent undesired escape of hot gases into the secondary section. This cost-effective measure can thus avoid damage to the auxiliary subassembly.

According to a development, it is possible that the at least one bulkhead and / or at least one bulkhead element is connected to the protective housing in the transverse direction and / or vertical direction at least at one connection point, preferably circumferentially.

This cost-effective measure can serve to prevent a squeezing and / or lifting of the protective housing from the bulkhead wall can be avoided. Free gases and / or splinters can thus not get around the bulkhead around in the sub-section. It has proven to be particularly efficient when such joints are formed by the cooling device substantially continuously along the side surfaces in the vertical direction, as well as at the top of the bulkhead in the transverse direction, running.

Furthermore, it may be expedient if the at least one connection point is designed as a screw connection and / or by means of a connection means, preferably designed as a hooking, plug-in or latching connection, such that in the event of an explosion a force-transmitting support of the bulkhead and / or the Schottwandelemente longitudinal direction and / or transverse direction and / or vertical direction of the power semiconductor section pioneering the protective housing.

A non-positive and positive connection point can be realized in a simple manner by training as a screw connection. In combination or independently, such, preferably circumferentially formed connection point, however, can also be designed as a simple hooking connection or the like, whose "plugging direction" is selected such that in the load case the

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Bulkhead is pressed against the protective housing and the entanglement prevents gas and / or splinter leakage.

In addition, it can be provided that the bulkhead elements and / or the protective housing are fastened in the vertical direction to the cooling device, preferably by means of at least one screw connection.

This measure is made possible by the "horizontal" arrangement of the power assembly to the centrally formed cooling device or cooling plate and can ensure a very stable and cost-effective backup and / or bracing of at least one protective housing to the cooling device. The bulkhead elements or the bulkhead can be penetrated by the fastening means, such as a screw, which in addition to a tension in the vertical direction and an additional reinforcement in the longitudinal direction is formed.

Furthermore, it can be provided that an additional front bulkhead wall between the cooling device and the protective housing, preferably over an entire protective housing height and / or protective housing width, is formed on the front side of the protective housing, which has at least two connection openings for busbars and / or control lines and / or measuring lines.

Such a front bulkhead wall can thus form the front end of the protective housing and exert an additional protective function towards the environment, or an operator positioned in front of the medium or high-voltage converter. Moreover, this can form a stable bearing at at least two points for the busbars and / or control lines and / or measuring lines by the interaction of such a front bulkhead with the bulkhead. In this way, mechanical stress and / or stress of the power semiconductors and / or their power semiconductor module connections can be efficiently avoided, whereby the service life of these components can be increased. Furthermore, the protective housing is supported in the vertical and / or longitudinal direction, whereby an increased stability of the power assembly can be ensured in the event of an explosion.

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According to a particular embodiment, it is possible that the bulkhead and / or the bulkhead elements and / or the front bulkhead of an electrically non-conductive, flame retardant material, preferably a fiber reinforced plastic, such as a material of class FR4, more preferably a composite material comprising epoxy resin and Fiberglass fabric, is formed.

The flame-retardant effect of such a material increases safety in the event of damage. Moreover, the use of composites by a particularly high mechanical strength and / or very high dielectric strength is particularly preferred. In addition, such materials can be glued together particularly well as additional sealing and / or support measure.

According to an advantageous development, it can be provided that the protective housing is connected to the cooling device at at least two fastening points, preferably circumferentially along the protective housing width and / or a protective housing length, by means of screw connections.

This measure provides an additional safeguard against pressing apart and / or lifting the protective housing from the bulkhead and the cooling device. In addition, in the case of service detachable fastening points are preferred by means of screw.

In particular, it may be advantageous if the cooling device has at least partially, preferably encircling, in the transverse direction and / or longitudinal direction a receiving groove for receiving parts of the protective housing or a cover strip.

Such a receiving groove may be divided into several segments in the circumferential direction, that is to say in the transverse and / or longitudinal direction, or may be designed to be continuous. By partially receiving the vertically adjacent areas of the protective housing and / or a cover strip in the event of an explosion obstruction of the escape of gases can be effected, whereby the gas leakage into the environment can be avoided. This relatively simple measure

N2018 / 09400-AT-00/34 is particularly suitable for protecting surrounding power assemblies.

Furthermore, it can be provided that the protective housing is at least partially, preferably circumferentially, in the transverse direction and / or longitudinal direction along the protective housing width and / or protective housing length attached to the cooling device to avoid gas leakage in the event of an explosion.

Such a cover strip can be used independently or in combination with a receiving groove to improve the mechanical connection of the protective housing to the cooling device and to avoid gas leakage.

In addition, it can be provided that the cooling device has at least one bulkhead element groove for respectively receiving at least part of a bulkhead wall element and / or at least part of the bulkhead wall in the vertical direction.

A bulkhead element groove may be formed together with a receiving groove, but superficially serves to support the bulkhead wall or a bulkhead wall element. This measure increases safety against gas and / or splinter entry between the bulkhead and the cooling device. In the limiting case, the width of the bulkhead element groove can have the width of the bulkhead wall or of a bulkhead wall element.

Also advantageous is an expression, according to which it can be provided that the protective housing has a plurality of, preferably bead-like, housing structures for compensating the gas pressure by means of plastic deformation in the event of an explosion.

On the one hand, these housing structures can increase the mechanical stability of the protective housing against pressure / tension, both from the outside and from the inside. On the other hand, a bulging of these housing structures can be exploited in the event of an explosion to compensate for the gas pressure, as this, a considerable proportion of the explosion energy must be expended. By a suitable

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Forming the housing structures on the side walls at the top and / or the protective housing as three-dimensional structures, a tearing of the protective housing can be avoided, whereby the security is significantly increased.

According to a development, it is possible for the busbars and / or control lines and / or measuring lines to have at least one offset in the longitudinal direction and / or transverse direction and / or vertical direction to avoid unrestrained movement and / or gas leakage through the bulkhead and / or at least one bulkhead element ,

Since the said connecting elements penetrate the bulkhead and / or the front bulkhead, could be carried out in the explosion in the longitudinal direction. Such an unrestrained and thus uncontrolled movement of the connecting elements is undesirable. In order to avoid this, the connecting elements may be formed cranked, whereby a mechanical support on the bulkhead can be achieved in case of load from the power semiconductor section in the event of an explosion. This offset of the busbars and / or control lines and / or measuring lines or any further connections or auxiliary lines, can effect an efficient seal in case of damage between the power semiconductor module and auxiliary subassembly.

According to a particular embodiment, it is possible that the protective housing made of metal, preferably a metal having a thermal conductivity of more than 20 W / m * K, more preferably more than 45 W / m * K, is formed.

Due to the formation of a metallic protective housing, in addition to a high mechanical stability, good heat removal to the environment and / or into the cooling device can additionally take place. This can be advantageous because the heat released in the event of an explosion well absorbed by the protective housing and controlled again can be derived. In this way, a kind of "deletion" of a plasma can take place, whereby the explosion can be limited locally and thus the safety can be increased. A thermal conductivity of more than 20 W / m * K has evolved at e.g. Austenitic or stainless steels proved to be advantageous, but also cheaper steels, such as galvanized steel sheets

N2018 / 09400-AT-00/34 with higher thermal conductivity of more than 45 W / m * K may be preferred. With sufficient mechanical strength and the use of non-ferrous alloys, such as aluminum or copper-based alloys with significantly higher thermal conductivity is conceivable.

Furthermore, it may be expedient if the protective housing for the separate protection of the power semiconductor section and the secondary section from at least two, preferably interconnected, partial protective housings is formed

In this particular embodiment, the local geometric requirements of a medium or high voltage converter may be taken into account, for example, by requiring different partial protective enclosure heights of the power semiconductor section and the minor section. Correspondingly, this measure can also offer certain advantages for the assembly and service of the power module. The at least two partial protection housings are preferably fastened to the bulkhead wall and particularly preferably in addition to one another and thus form a substantially one-part protective housing with the aforementioned advantages.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

In each case, in a highly simplified, schematic representation:

Fig. 1 is a schematic oblique view of a portion of a medium or high voltage converter with three superimposed power modules;

FIG. 2 is a schematic exploded view in an oblique view of an embodiment of a power module with a cooling device designed for load-carrying cooling plate; FIG.

Fig. 3 is a schematic exploded view in an oblique view of a possible formation of a bulkhead of several bulkhead elements;

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4 shows a schematic sectional illustration of exemplary embodiments of support elements (a) and connecting points (b, c) between a bulkhead wall and the protective housing;

5 shows a schematic sectional illustration of exemplary embodiments for fastening the protective housing to the cooling device (a-c);

6 is a schematic sectional view of a protective housing with housing structures for absorption of the explosion energy in the undeformed state (a) and in the explosion case (b);

Fig. 7 is a schematic oblique view of an embodiment of a power assembly with two partial protection housings.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

In Fig. 1 is a schematic representation of a portion of a medium or high voltage converter 2 is shown. In the exemplary illustration, the frame has a plurality of receiving spaces arranged one above the other. These serve to receive in each case a power module 1, which are supported on support surfaces 45 on the support elements 38. The frame 39 may have at least two pairs of vertical standing elements 37. These are connected in the longitudinal direction 12 in the support plane by support members 38. From this illustration, the particularly space-saving arrangement of the power modules 1 in the respective receiving spaces of the frame 39 of the medium or high voltage converter 2 can be seen very well.

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From FIG. 1 in conjunction with FIG. 2, it can further be seen that each power module 1 has a plurality of connection openings 31, such as for busbars 18, control lines 19, measuring lines 20 or the like. Furthermore, coolant connections 48 of the cooling device 3 on the front side 35 can be seen. The busbars 18 are advantageously aligned in the vertical direction 14 in alignment with each other. The arrangement of the connections on the front side 35 good accessibility for an operator is possible. In the selected representation, it can further be seen that those of the power modules 1 have their greatest longitudinal extent in the longitudinal direction 12, which in this example clearly projects beyond the longitudinal extent in the transverse direction 13 and in the vertical direction 14. In this way, a substantially horizontal arrangement of the power module 1 on the support elements 38 is ensured.

Furthermore, it can be seen from Fig. 1, that the cooling plate 9 may be formed as a load-bearing element of the power assembly 1. By arranging the at least one energy storage module 4 on the, at least one power semiconductor module 5 opposite top or bottom 11 of the cooling plate 9 is achieved a very stable position of the power assembly 1 in the frame 39 with a very low center of gravity.

In Fig. 2 is an exploded view of an embodiment of a power assembly 1 is shown schematically. The centrally arranged cooling device 3 is designed as a coolant or liquid-carrying cooling plate 9. The power semiconductor module 5 and the auxiliary module 6 are arranged in the vertical direction 14 on the upper side 10 of the cooling device 3. In the selected representation, the energy storage module 4 is formed on the underside 11 of the cooling device 3. The electrical conductors of the energy storage module 4 can be combined, for example, by means of a connection terminal 46 shown schematically. The cooling device 3 or the cooling plate 9 has a terminal opening 47 for the passage and electrical connection of the energy storage module 4 to the power semiconductor module 5. The arrangement of the individual power semiconductors within the power semiconductor section 15 is

N2018 / 09400-AT-00/34 indicated only schematically and can be varied and optimized by the skilled person according to the respective requirements. Similarly, only a few capacitors 49 are indicated as part of the energy storage module 4, which are shielded from an energy storage housing 22 from the environment.

From Fig. 2 is further very well seen that the auxiliary assembly 6 includes at least one signal conditioning assembly 8. This signal conditioning module 8 essentially represents the control center of the respective power module 1 and performs, inter alia, a plausibility check of the incoming control signals. The auxiliary subassembly 6 is spatially separated from the power semiconductor subassembly 5 by a bulkhead 7. The bulkhead 7 connects the protective housing 21 to the cooling device 3 and thus represents a type of seal between the auxiliary subassembly 6 and the power semiconductor subassembly 5. The bulkhead 7 and / or the front bulkhead 30 visible on the front side 35 can thus essentially extend over the entire protective housing width 33 and / or or protective housing height 34 may be formed. In addition, the bulkhead 7 and / or the front bulkhead 30 have an extension in the longitudinal direction 12, which forms part of the protective housing length 32. From Fig. 2 it is also clear that the cooling device 3, especially in training as a cooling plate 9, provides effective protection in the event of an explosion down. In addition, such a cooling plate 9 can be used as a construction platform to remove the total load of the power assembly in the frame 39.

As schematically illustrated in FIG. 2, the bulkhead 7 has at least one passage opening 23 that is complementary in shape to any busbars 18 and / or control lines 19 and / or measuring lines 20. Some of these connecting elements may additionally be guided through connection openings 31 provided through a front bulkhead 30. From Fig. 2, the good support of the busbars 18 and / or control lines 19 and / or measuring lines 20 due to the relatively wide bearing surfaces in the longitudinal 12 and transverse direction 13 can be seen.

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In Fig. 3 is a schematic exploded view of a possible construction of a bulkhead 7 of a plurality of bulkhead elements 17 is shown. The bulkhead elements 17 may have recesses 24 for forming the at least one through opening 23. By way of example, two measuring lines 20 are shown, which are arranged in form-complementary recesses 24 of a bulkhead wall element 17 provided for this purpose. Furthermore, it can be seen from FIG. 3 that the busbars 18 are at least partially accommodated in recesses 24 of the bulkhead elements 17 provided therefor. The bulkhead elements 17 can be arranged one above the other "in the form of a layer" as in the manner illustrated. However, it is also conceivable that the bulkhead elements 17 are "block-shaped" to be arranged side by side and / or one above the other.

A further particular embodiment can be seen very clearly from FIG. 3, in which a crank 50 of electrical connecting elements, such as the busbars 18 and / or measuring lines 20, is formed. By virtue of the complementary shape through openings 23 and / or the recesses 24 of the bulkhead elements 7, an additional safeguard against movement in the direction of the auxiliary subassembly 6 can be avoided by means of such cranked connecting elements. The crank 50 of the corresponding elements may be formed in the vertical direction 14 and / or transverse direction 13 and / or longitudinal direction 12.

In Fig. 3, a plurality of attachment points 41 are further indicated, which are provided for releasably securing the protective housing 21 and / or the bulkhead 7 and the bulkhead elements 17 to the cooling device 3 by means of screw 28. The bulkhead elements 17 and the bus bars 18 therefore each have suitable openings for receiving the screw connections in the exemplary embodiment, an electrical connection of the individual elements being avoided by the screw connection. Any isolation elements are known in the art and therefore not explained in detail.

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Furthermore, in Fig. 3, the formation of a receiving groove 43 in the transverse direction 13 and longitudinal direction 12 for receiving parts of the protective housing 21 or a cover strip 44 on the cooling plate 9 can be seen. This receiving groove 43 may preferably be circumferentially formed in the circumferential direction and serves to support the corresponding parts of the protective housing 21 as can be seen from the synopsis with Fig. 5. Two bulkhead grooves 51 are further formed on the cooling device 3 in such a way that parts of the bulkhead wall 7, not shown in more detail, or bulkhead elements 17 arranged directly on the cooling device 3 can at least partially be accommodated.

4 includes a plurality of sectional views through embodiments of possible support elements 25 and / or connection points 27, which connect the protective housing 21 to the bulkhead 7 or a bulkhead element 17 arranged at the top. The sectional views are shown in the transverse direction 13 along the dashed line shown in Fig. 3 IV-IV. In Fig. 4a, the formation of two support elements 25 is indicated, which support the bulkhead 7 in the direction of the secondary section 16 in the explosion case. The gas pressure 26 can not reach the bulkhead 7 past the power semiconductor section 15 into the secondary section 16.

Another, possibly independent, embodiment is shown in FIG. 4b. Here, the bulkhead 7 is supported relative to the protective housing 21 by means of a connection point 27, wherein the connecting means 29 is formed as a hooking connection. Lifting or pushing apart the bulkhead 7 and the protective housing 21 can thus be avoided and the gas pressure 26 can be effectively maintained in the power semiconductor section 15.

In Fig. 4c is another, possibly independent, or even combinable with the other embodiments embodiment shown. The attachment of the protective housing 21 to the bulkhead 7 is in the form of a screw 28, whereby a loss of the gas pressure 26 in the direction of the secondary section 16 can be avoided analogous to the description of Fig. 4b.

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In Fig. 5, some possible embodiments for the attachment of the protective housing 21 to the cooling device 3 are shown. In FIGS. 5a and 5b, at least part of the protective housing 21 is received in the receiving groove 43 provided for this purpose and supported in this way in the transverse direction 13 and vertical direction 14.

In Fig. 5a, a cover strip 44 is additionally provided, which connects the protective housing 21 with the cooling device 3 and is secured by screw 28. Such trained attachment points 41 may be carried out along the longitudinal direction 12 and / or transverse direction 13 analog. The cover strip 44 may preferably be formed circumferentially.

In Fig. 5b, a similar embodiment is shown schematically, wherein the function of the cover strip 44 of FIG. 5a is taken over by a correspondingly shaped end portion of the protective housing 21.

In Fig. 5c, another, self-contained, embodiment is shown, wherein the receiving groove 43 receives a portion of the cover strip 44 and a common attachment point 41 is formed by a screw 28.

The exemplary embodiments of FIG. 5 have in common that the gas pressure 26 can not escape between the protective housing 21 and the cooling device 3, since a hot gas is deflected by the elements received by the receiving groove 43.

FIG. 6 diagrammatically shows a further embodiment of a power module 1, which may be independent of itself, having a protective housing 21. The protective housing 21 is in turn connected to a plurality of attachment points 41 with the cooling device 3, which may also be formed analogous to the preceding description of FIG. The protective housing 21 in FIG. 6a has, by way of example, three housing structures 40, which protrude into the interior of the power semiconductor section 15 as three-dimensional structures. As in

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6b, the protective housing 21 can be plastically deformed in the event of an explosion. The housing structures 40 of FIG. 6a can serve as additional energy absorbers and be pressed by the gas pressure 26 to the outside, wherein a large part of the explosion energy can be absorbed.

FIG. 7 diagrammatically shows another embodiment of a power module 1 with a protective housing 21, which may be independent of itself. For the same parts again the same reference numerals as in the preceding Figs. 1 to 6 are used. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding figures. The power module 1 shown schematically has a protective housing 21 made of two partial protective housings 52. The two

Part protection housing 52 are connected to attachment points 41, not shown, with the protective housing. Preferably, the partial protection housings 52 are also connected to one another and / or to the bulkhead 7, which is arranged on the inside and is shown in dashed lines, e.g. Screw 28 and / or a cover strip 44, analogous to the connection of the protective housing 21 to the cooling device 3, respectively. It can be seen from Fig. 7 that in this way different partial protective housing heights 53 can be relatively easily realized.

The embodiments show possible embodiments, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are mutually possible and this variation possibility due to the teaching of technical action by representational invention in Can the expert working in this technical field.

The scope of protection is determined by the claims. However, the description and drawings are to be considered to interpret the claims. Individual features or combinations of features from those shown and described

N2018 / 09400-AT-00/34 different embodiments may represent for themselves inventive solutions. The task underlying the independent inventive solutions can be taken from the description.

All statements of value ranges in the present description should be understood to include any and all sub-ranges thereof, e.g. is the statement 1 to 10 to be understood that all sub-areas, starting from the lower limit 1 and the upper limit 10 are included, ie. all sub-areas begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

For the sake of order, it should finally be pointed out that for a better understanding of the construction, elements have been shown partially unevenly and / or enlarged and / or reduced in size.

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LIST OF REFERENCE NUMBERS

Leistungsbaugruppel 29 connecting means Medium or high voltage 30 Front bulkhead converters 31 port opening cooler 32 Housing length Energy storage module 33 Housing width Power semiconductor device 34 Housing height auxiliary assembly 35 front bulkhead 36 back Signalaufbereitungsbau- 37 Vertical standing element group 38 supporting member cooling plate 39 frame top 40 housing structure bottom 41 fastening point longitudinal direction 42 end transversely 43 receiving groove vertical direction 44 cover strip Power semiconductor section 45 supporting next section 46 connection terminal Bulkhead element 47 terminal opening conductor rail 48 Coolant connection control line 49 capacitor Measurement line 50 cranking housing 51 Schottwandnut Energy storage enclosure 52 Part protective housing Through opening 53 Partial protection Thinness

recess

support element

gas pressure

junction

screw

Claims (18)

claims Power module (1) for a medium or high voltage converter (2), preferably a modular multilevel converter comprising at least one power semiconductor module (5), at least one energy storage module (4), at least one cooling device (3), at least one auxiliary subassembly (6), which has at least one signal conditioning subassembly (8), characterized in that - The at least one power semiconductor module (5) and the at least one auxiliary subassembly (6) in the vertical direction (14) on each upper (10) or underside (11) of the substantially horizontally oriented cooling device (3) are arranged - and the at least one power semiconductor module (5) in a power semiconductor section (15) and the at least one auxiliary module (6) in a secondary section (16) within a with the cooling device (3) connected, preferably integrally formed, protective housing (21) are arranged - Wherein explosion protection at least one, preferably at least in the vertical direction (14) composed of a plurality of bulkhead elements (17), bulkhead (7) between the cooling device (3) and the protective housing (21) is formed, and - The at least one bulkhead (7) at least one of any busbars (18) and / or control lines (19) and / or measuring lines (20) form complementary through hole (23). 2. Power module (1) according to claim 1, characterized in that the at least one power semiconductor module (5) opposite upper (10) or lower side (11) of the cooling device (3), preferably within a at least one energy storage assembly (4) Energy storage housing (22) is arranged, and wherein the cooling device (3) is designed as a load-bearing cooling plate (9). N2018 / 09400 AT-00 23/34 3. Power module (1) according to one of claims 1 or 2, characterized in that the bulkhead (7) at least two in the vertical direction (14) one above the other and / or in the transverse direction (13) juxtaposed, electrically non-conductive, bulkhead elements (17) , 4. power assembly (1) according to any one of the preceding claims, characterized in that at least two of the bulkhead elements (17) at least partially in the transverse direction (13) and / or longitudinal direction (12) and / or vertical direction (14) form complementary recesses (24) for at least partially receiving the busbars (18) and / or any control lines (19) and / or measuring lines (20). 5. power module (1) according to one of the preceding claims, characterized in that at least one support element (25), preferably a plurality of support elements (25) on the protective housing (21) in the transverse direction (13) and / or vertical direction (14), preferably circumferentially, for supporting the at least one bulkhead (7) and / or at least one bulkhead element (17) in the longitudinal direction (12) of the power semiconductor section (15) pioneering under load by gas pressure (26) in the event of an explosion, is formed. 6. Power module (1) according to one of the preceding claims, characterized in that the at least one bulkhead (7) and / or at least one bulkhead element (17) with the protective housing (21) in the transverse direction (13) and / or vertical direction (14) at least at a connection point (27), preferably circumferentially connected. 7. power assembly (1) according to claim 6, characterized in that the at least one connection point (27) as a screw connection (28) and / or by means of one, preferably designed as a hooking, plug-in or latching connection, connecting means (29) is designed in that in the case of an explosion a force-transmitting support of the bulkhead (7) and / or the N2018 / 09400 AT-00 24/34 Schottwandelemente (17) from the power semiconductor section (15) pioneering the protective housing (21). 8. Power assembly (1) according to one of the preceding claims, characterized in that the bulkhead elements (17) and / or the protective housing (21) in the vertical direction (14) on the cooling device (3), preferably by means of at least one screw (28) attached are. 9. power module (1) according to one of the preceding claims, characterized in that an additional front bulkhead wall (30) between the cooling device (3) and protective housing (21), preferably over an entire protective housing height (34) and / or protective housing width (33) on the Front side (35) of the protective housing (21) is formed, which has at least two connection openings (31) for busbars (18) and / or control lines (19) and / or measuring lines (20). 10. Power module (1) according to one of the preceding claims, characterized in that the bulkhead (7) and / or the bulkhead elements (17) and / or the front bulkhead (30) made of an electrically non-conductive, flame-retardant material, preferably a fiber-reinforced plastic, such as a material of class FR4, more preferably a composite material comprising epoxy resin and glass fiber fabric, is formed. 11. Power module (1) according to one of the preceding claims, characterized in that the protective housing (21) with the cooling device (3) at least two attachment points (41), preferably circumferentially along the protective housing width (33) and / or a protective housing length (32) , by means of screw (28) is connected. 12. power module (1) according to one of the preceding claims, characterized in that the cooling device (3) at least partially, N2018 / 09400 AT-00 25/34 preferably circumferentially, in the transverse direction (13) and / or longitudinal direction (12) has a receiving groove (43) for receiving parts of the protective housing (21) or a cover strip (44). 13. Power module (1) according to one of the preceding claims, characterized in that the protective housing (21) to avoid gas leakage in the event of explosion by at least one cover strip (44) at least partially, preferably circumferentially, in the transverse direction (13) and / or longitudinal direction (12 ) is secured to the cooling device (3) along the protective housing width (33) and / or protective housing length (32). 14. Power module (1) according to one of the preceding claims, characterized in that the cooling device (3) at least one Schottwandnut (51) for receiving at least a portion of a bulkhead element (7) and / or at least a portion of the front bulkhead (30) in the vertical direction having. 15. Power module (1) according to one of the preceding claims, characterized in that the protective housing (21) for compensating the gas pressure (26) by means of plastic deformation in the explosion case, a plurality of, preferably bead-like, housing structures (40). 16. Power module (1) according to one of the preceding claims, characterized in that the busbars (18) and / or control lines (19) and / or measuring lines (20) to prevent their unrestrained movement and / or gas outlet through the bulkhead (7) and / or at least one bulkhead element (17) at least one crank (50) in the longitudinal direction (12) and / or transverse direction (13) and / or vertical direction (14). 17. Power assembly (1) according to one of the preceding claims, characterized in that the protective housing (21) made of metal, preferably N2018 / 09400 AT-00 26/34 a metal with a thermal conductivity of more than 20 W / m * K, more preferably more than 45 W / m * K, is formed. 18. Power module (1) according to one of the preceding claims, characterized in that the protective housing (21) is formed from at least two, preferably interconnected, partial protective housings (52).