Voltage conversion system and method for manufacturing such a voltage conversion system

Abstract

The invention relates to a voltage conversion system (1000) comprising: a voltage converter (100), a housing (200) including a cooling device, said voltage converter (100) being positioned inside said housing (200) so as to be in thermal contact with said cooling device, and an electrical connector (300) comprising a first (310) and a second busbar (330), said electrical connector (300) being designed to electrically connect said voltage converter (100) to at least one electrical network via said first (310) and said second busbar (330), said system being characterized in that said first busbar (310) is in thermal contact with said cooling device via the exterior of said housing (200). Figure 1

Description

Title of the invention: Voltage conversion system and method for manufacturing such a voltage conversion system. Technical field

[0001] The invention relates to a voltage conversion system for use in a motor vehicle. The invention also relates to a method for manufacturing such a voltage conversion system. technological BACKGROUND

[0002] Voltage conversion systems are known comprising a voltage converter, a housing including a cooling device, the voltage converter being positioned inside the housing so as to be in thermal contact with the cooling device, and an electrical connector.

[0003] In such systems, the electrical connector comprises a first and a second busbar and is designed to electrically connect the voltage converter to at least one electrical network via the first and second busbars.

[0004] However, in such voltage conversion systems, the heat generated at the electrical connector and more particularly at the levels of its bus bars can become excessive when the powers implemented by the voltage converter increase.

[0005] The invention aims to alleviate at least part of the aforementioned problem. Summary of the invention

[0006] To this end, according to a first aspect of the invention, a voltage conversion system is proposed comprising:

[0007] • a voltage converter, • a housing including a cooling device, the voltage converter being positioned inside the housing so as to be in thermal contact with the cooling device, and • an electrical connector comprising a first and a second bus bar, the electrical connector being designed to electrically connect the voltage converter to at least one electrical network via the first and second bus bars.

[0008] The system is further characterized in that the first busbar is in thermal contact with the cooling device via the outside of the housing.

[0009] For the purposes of the invention, a busbar is a low impedance conductor, for example a metal bar, for example made of copper.

[0010] By bringing the first busbar into thermal contact with the cooling device via the outside of the housing, it is possible to cool this first busbar and thus avoid excessive heating of the electrical connector.

[0011] A voltage conversion system according to the invention may further include one or more of the following optional features, taken individually or in any technically possible combination.

[0012] According to a first characteristic, the electrical connector is fixed to the housing.

[0013] According to another characteristic, the voltage converter is a DC-DC voltage converter also called a DC / DC converter.

[0014] According to another characteristic, the voltage converter is a DC-AC voltage converter also called a DC / AC converter.

[0015] According to another feature, the electrical connector further comprises a first and a second connection terminal, the first busbar and the second busbar being capable of being mechanically and electrically connected to said at least one electrical network via respectively the first connection terminal and the second connection terminal.

[0016] According to another feature, the first connection terminal is a metal stud, for example made of steel.

[0017] According to another feature, the second connection terminal is a metal stud, for example made of steel.

[0018] According to another feature, the second busbar is in thermal contact with the cooling device via the outside of the housing.

[0019] According to another feature, the first omnibus bar and / or the second omnibus bar is formed in a monobloc manner, i.e. in continuity of material.

[0020] According to another feature, a portion of the first busbar and / or a portion of the second busbar is located inside the housing.

[0021] According to another feature, the electrical connector includes an overmolding in electrically insulating material, for example plastic, the overmolding at least partially overmolding the first and second busbars.

[0022] According to another feature, the overmolding holding together the first omnibus bar and the second omnibus bar.

[0023] According to another feature, the housing further includes a support plate capable of delimiting a first volume of the housing in which a cooling fluid is intended to circulate to cool the voltage converter from a second volume of the housing in which the voltage converter is positioned.

[0024] According to another feature, the housing includes a coolant inlet dissement, a cooling fluid outlet and the first volume includes at least one cooling channel connecting the cooling fluid inlet to the cooling fluid outlet.

[0025] According to another feature, the case includes a base and a peripheral side wall surrounding the base and the cooling channel is delimited at least in part by the support tray and / or the base and / or the peripheral side wall and / or by at least one wall extending between the base and the support tray.

[0026] According to another feature, the peripheral side wall comprises a first face facing outwards from the housing, the peripheral side wall extending between the bottom and the support plate, a portion of the support plate extending substantially perpendicularly to the first face of the peripheral side wall, the portion comprising a through hole arranged to receive the electrical connector, the support plate comprising a second face on which the voltage converter is positioned and a second face opposite to the second face of the support plate, the electrical connector being fixed to the first face of the support plate.

[0027] According to another feature, the peripheral side wall, the support plate and said at least one wall extending between the bottom and the support plate are made in continuity of material, for example by a casting process.

[0028] According to another feature, the first busbar is in thermal contact with the cooling device via the outside of the housing through a thermally conductive connecting element, for example by a thermally conductive paste or by a thermal pad (from the English "Gad Pad")

[0029] According to another feature, the cooling device includes a base having a first face intended to receive heat to be dissipated emitted by the voltage converter, and at least one fin extending over a second face of the base opposite the first face, the first face of the base being turned towards the inside of the housing, the first bus bar being in thermal contact with the second face of the base.

[0030] According to another feature, the electrical connector further comprises a first auxiliary connection terminal, the first busbar and the second busbar being able to be mechanically and electrically connected to said at least one electrical network via respectively the first auxiliary connection terminal and the second connection terminal.

[0031] According to another feature, the electrical connector further comprises a first auxiliary connection terminal and a second auxiliary connection terminal, the first busbar and the second busbar being capable of being mechanically and electrically connected to said at least one electrical network via the first auxiliary connection terminal and the second busbar, respectively. second auxiliary connection terminal.

[0032] According to another feature, the first auxiliary connection terminal is a metal stud, for example made of steel.

[0033] According to another feature, the second auxiliary connection terminal is a metal stud, for example made of steel.

[0034] A method for manufacturing a voltage conversion system according to the first aspect of the invention is also proposed, according to a second aspect of the invention and:

[0035] • obtaining a voltage converter, • obtaining a casing that includes a cooling device, • Positioning the voltage converter within the housing so that it is in thermal contact with the cooling device, • obtaining an electrical connector comprising a first and a second busbar, the electrical connector being designed to electrically connect the voltage converter to at least one electrical network via the first and second busbars, • thermal contact of the first busbar with the cooling device via the outside of the housing.

[0036] The assembly method according to the invention may further include the following optional feature, according to which the assembly method further includes the attachment of the electrical connector to the housing.

[0037] The invention will be better understood in the light of the following description, given solely by way of non-limiting example and with reference to the following figures: DESCRIPTION OF FIGURES

[0038] Fig. 1 is a top view of a voltage conversion system according to one embodiment of the invention.

[0039] Fig. 2 is a three-dimensional exploded view of the voltage conversion system shown in Fig. 1.

[0040] Fig. 3 is a three-dimensional exploded view of the upper part of the housing of the voltage conversion system of Fig. 1.

[0041] Fig. 4 is a view of the lower part of the housing of the voltage conversion system of Fig. 1.

[0042] Fig. 5 represents the electrical connector without overmolding of the voltage conversion system of Fig. 1.

[0043] Fig. 6 represents, in flowchart form, the different stages of a manufacturing process for the voltage conversion system of Fig. 1. DETAILED DESCRIPTION

[0044] Fig. 1 represents a top view of a voltage conversion system 1000 in one embodiment of the invention.

[0045] As shown in [fig.2], the voltage conversion system 1000 includes a voltage converter 100 designed to convert a first electrical voltage VI into a second electrical voltage V2, a housing 200 including a cooling device for cooling the voltage converter 100 and an electrical connector 300.

[0046] In the example described here, the electrical connector 300 is further fixed to the housing 200. In other words, the electrical connector 300 is a separate part from the housing 200 before its assembly onto the housing 200.

[0047] The voltage converter 100 in the example described here is a DC / DC voltage converter. This voltage converter is intended to be installed in a vehicle to perform voltage conversion between a first electrical network and a second electrical network of the vehicle. Typically, the first electrical network is a low-voltage network delivering a first electrical voltage V1 of less than 30V, for example, approximately 24 or 12V, and the second electrical network is a high-voltage network delivering a second electrical voltage V2 greater than 30V, for example, 48V.

[0048] In the example described here, the voltage converter 100 comprises an electronic board 110 having a plurality of voltage choppers (not shown in [Fig. 2]) in parallel. Each of the voltage choppers comprises an inductor and two transistors functioning as electronic switches.

[0049] In the example described here, these two transistors are MOSFETs (Metal Oxide Semiconductor Field Effect Transistors). Alternatively, these transistors could also be IGBTs (Insulated Gate Bipolar Transistors) or gallium nitride (GaN) power FETs (Field Effect Transistors).

[0050] It is known that such a voltage converter 100 can address different operating powers depending on the number of voltage choppers arranged in parallel.

[0051] With reference to [fig.3] and [fig.4], the housing 200 comprises a base 210, a peripheral side wall 220 surrounding the base 210, a support tray 230 and a cooling device for cooling the voltage converter 100.

[0052] The peripheral side wall 220 extends between the bottom 210 and said support platform 230 and includes a first face turned outwards from the housing 200.

[0053] The base 210 is in the form of a lid positioned on a surface support of the peripheral side wall 220 and fixed, for example by friction-mixing, to the peripheral side surface 220.

[0054] Alternatively, the cover can be screwed onto a bearing surface of the peripheral side wall 220 by inserting a sealing gasket between the cover and the peripheral side wall 220.

[0055] The support plate 230 delimits a first volume PV1 of the housing 200 in which a cooling fluid, for example water, is intended to circulate to cool the voltage converter 100 and a second volume PV2 of the housing 200 in which the voltage converter 100 is mounted.

[0056] The support platform 230 thus has a first face turned towards the first volume PV1 and a second face turned towards the second volume PV2, the second face being opposite to the first face.

[0057] In addition, the voltage converter 100 is positioned and fixed on the second face, for example by screws. Alternatively, the voltage converter 100 is fixed on the second face by riveting or by gluing.

[0058] The housing 200 further includes a coolant inlet 240 and a coolant outlet 250 while the first volume consists of a cooling channel connecting the coolant inlet 240 to the coolant outlet 250.

[0059] In the embodiment described here, the cooling channel is delimited by the first face of the support tray 230, by the bottom 210, by the peripheral side wall 220 and by walls 260 extending between the bottom 210 and the support tray 230.

[0060] In this way, the circulation of the cooling fluid in the cooling channel and, consequently, under the support plate 230 supporting the voltage converter 100 allows this voltage converter 100 to be cooled.

[0061] Thus, the cooling channel, the cooling fluid inlet, the cooling fluid outlet and the support tray constitute a cooling device for the voltage converter 100.

[0062] In addition, a portion 235 of the support tray 230 extends substantially perpendicularly to the first face of the peripheral side wall 220, this portion 235 comprising a through hole 236 arranged to receive the electrical connector 300 so that this electrical connector 300 is fixed to the first face of the support tray 230.

[0063] In the example described here, the peripheral side wall 220, the support platform 230, and the walls 260 are made of a single piece of material, for example, metal such as aluminum, for example, by a casting process. In other words, the peripheral side wall 220, the support platform 230, and the walls 260 constitute a single unit. a metal part, for example made of aluminum, produced for example by a casting process. Alternatively, the peripheral side wall 220, the support plate 230 and the walls 260 can be parts produced separately before being assembled.

[0064] With reference to [fig.5], the electrical connector 300 comprises a first positive busbar 310, a second positive busbar 320 and a negative busbar 330, the negative busbar 330 being intended to be connected to an electrical ground.

[0065] In the example described here, the first positive busbar 310 is metallic, for example, copper. Similarly, the second positive busbar 320 is metallic, for example, copper. Finally, the negative busbar 330 is also metallic, for example, copper.

[0066] In the example described here, the first positive omnibus bar 310, the second positive omnibus bar 320 and the negative omnibus bar 330 are further formed in a monobloc manner, i.e. in continuity of material.

[0067] The electrical connector 300 is designed to electrically connect the voltage converter 100 to the first electrical network via the first positive busbar 310 and the negative busbar 330 and to the second electrical network via the second positive busbar 320 and the negative busbar 330.

[0068] It will be appreciated that in the example described, the first positive busbar 310, the second positive busbar 320 and the negative busbar 330 are rigid electrical conductors designed to support electric current densities of at least 1OA / mm2.

[0069] Thus the first positive omnibus bar 310 and the negative omnibus bar 330 present between them the first electrical voltage VI and the second positive omnibus bar 320 and the negative omnibus bar 330 present between them the second electrical voltage V2 when the voltage converter 100 converts the first electrical voltage VI into the second electrical voltage V2.

[0070] In the example described here, a first positive connection terminal is fixed on a flat portion of the first positive busbar 310, a second positive connection terminal is fixed on a flat portion of the second positive busbar 320 and a negative connection terminal is fixed on a flat portion of the negative busbar 330.

[0071] The first positive connection terminal, the second positive connection terminal and the negative connection terminal are respectively, in the example described here, studs 312, 322, 332. The studs 312, 322, 332 are threaded and made of metal, for example steel.

[0072] The first positive connection terminal and the negative connection terminal These terminals allow for the mechanical attachment of busbars 310 and 330 to power cables in order to electrically connect these busbars to the primary electrical network. Similarly, the second positive connection terminal and the negative connection terminal allow for the mechanical attachment of busbars 320 and 330 to power cables in order to electrically connect these busbars to the secondary electrical network.

[0073] The attachment of an electrical cable to one of these bus bars is carried out for example by inserting the threaded stud of the bus bar into the eye of a lug of the electrical cable and then screwing a nut onto the threaded stud so as to press the lug against the bus bar in order to make the electrical connection between the bus bar and the lug.

[0074] Optionally, a first auxiliary positive connection terminal is fixed on a flat portion of the first positive busbar 310 and an auxiliary negative connection terminal 334 is fixed on a flat portion of the negative busbar 330.

[0075] The first auxiliary positive connection terminal and the auxiliary negative connection terminal are respectively, in the example described here, studs 314, 334. The studs 314, 334 are made of metal, for example steel.

[0076] The first auxiliary positive connection terminal and the auxiliary negative connection terminal allow the bus bars 310, 330 to be mechanically fixed to power supply cables in order to electrically connect these bus bars 310, 330 to the first electrical network.

[0077] The use of two different connection terminals makes it possible to mechanically and electrically fix the positive busbar to the first electrical network by means of two different electrical supply cables.

[0078] Thus, the electric current passing through each of these two electric cables is reduced so that the electric cables heat up less.

[0079] Similarly, the second positive connection terminal and the auxiliary negative connection terminal allow the bus bars 320, 330 to be mechanically fixed to power supply cables in order to electrically connect these bus bars 320, 330 to the second electrical network.

[0080] The electrical connector 300 further comprises a magnetic toroid 340 surrounding the first positive omnibus bar 310, the second positive omnibus bar 320 and the negative omnibus bar 330.

[0081] The first positive omnibus bar 310, the second positive omnibus bar 320 and the negative omnibus bar 330 are at least partly overmolded with an insulating material 350 (not visible on [fig.5] but visible on [fig.2]), for example with an insulating plastic material.

[0082] In the example described here, the magnetic torus 340 is mounted around the first positive omnibus bar 310, the second positive omnibus bar 320 and the negative omnibus bar 330 after overmolding of these three omnibus bars 310, 320, 330.

[0083] In the example described here, the first end of the first positive busbar 310 has a general T-shape. The first positive connection terminal and the first auxiliary positive connection terminal are each fixed to a different end of the crossbar of this T. Similarly, in the example described, the first end of the negative busbar 330 has a general T-shape. The negative connection terminal and the auxiliary negative connection terminal are each located at a different end of the crossbar of this T.

[0084] Alternatively, the first end of the first positive busbar 310 could have a general Y shape. The first positive connection terminal and the first auxiliary positive connection terminal would each be fixed to one end of a different branch of this Y. Similarly, the first end of the negative busbar 330 could have a general Y shape. The negative connection terminal and the auxiliary negative connection terminal would each be located at one end of a different branch of this Y.

[0085] In the example described here, the electrical connector 300 is fixed, for example by screws, to the outside of the housing 200 on the first face of the support plate 230. In the example described here, the electrical connector 300 is fixed to the first face of the support plate 230 at a stud 270 located at its part 235 and at at least one fixing stud 271 located on the first face of the support plate 230.

[0086] To fix the electrical connector 300 to the outside of the housing 200, a second end of the first positive busbar 310, a second end of the second positive busbar 320, and a second end of the negative busbar 330 are inserted into the through hole 236 so that these ends are located inside the housing 200, and more specifically in the second PV2 compartment of the housing 200, and so that these ends can be physically connected to the voltage converter 100. To ensure a seal between the electrical connector 300 and the housing 200, a sealing gasket surrounding the through hole 236 can be inserted between the electrical connector 300 and the housing 200 when fixing the electrical connector 300 to the housing 200.

[0087] In addition, when attaching the electrical connector 300 to the housing 200, the first positive busbar 310 and the negative busbar 330 are brought into thermal contact with the cooling device of the housing 200 via the outside of this housing 200.

[0088] Thanks to this thermal contact with the cooling device of the 200 case by The outside of this 200 box, the first positive busbar 310 and the negative busbar 330 can be cooled, which limits their heating as well as the heating of the electrical connector 300 and the cables connected to the terminals of this electrical connector 300.

[0089] In the example described here, the first positive busbar 310 is in thermal contact with the outside of the housing 200 by means of at least one thermal pad placed between an outside surface of the housing 200 and a surface of the first positive busbar 310.

[0090] In the example described, three thermal pads 410, 420 and 430 (in [fig.1], only thermal pads 410 and 430 are visible) are placed between the housing 200 and the first positive busbar 310

[0091] Similarly, the negative bus bar 330 is in thermal contact with the outside of the housing 200 by means of at least one thermal pad placed between an outside surface of the housing 200 and a surface of the negative bus bar 330.

[0092] Alternatively, the first positive busbar 310 and / or the negative busbar 330 are in thermal contact with the outside of the housing 200 by means of a thermally conductive paste placed between them and an external surface of the housing 200.

[0093] In the example described here, the first positive busbar 310 is in thermal contact with the bottom 210 and with the peripheral side wall 220 of the housing 200. In this way, the circulation of the cooling fluid in the cooling channel and, consequently, in contact with the bottom 210 and with the peripheral side wall 220 allows the first positive busbar 310 to be cooled.

[0094] In the example described here, the negative busbar 330 is in thermal contact with the first surface of the support plate 230. In this way, the circulation of the cooling fluid in the cooling channel and, consequently, in contact with the support plate 230, allows the negative busbar 330 to be cooled.

[0095] Optionally, the cooling device may include a heat sink comprising a base and at least one fin (not shown in the figures). The base of the heat sink comprises a first face for receiving and dissipating heat emitted by the voltage converter 100, and a second face opposite the first. The at least one fin extends along the second face. In other words, the first face of the base faces inward toward the housing and the second face faces outward toward the housing. For example, the bottom 210 of the housing 220 can constitute such a base. In the example described here, the first positive busbar 310 is in thermal contact with the second face of the base, i.e., with the outer part of the bottom 210, via the at least one heat pad and the side walls 220 of the housing 200.

[0096] With reference to [fig.6], an example of a 2000 process for manufacturing the 1000 voltage conversion system will now be described.

[0097] During a step E2100, a voltage converter 100 is obtained.

[0098] During a step E2200, a housing 200 comprising a cooling device Dissolution is obtained.

[0099] During a step E2300, the voltage converter 100 is positioned in the housing 200 so that the voltage converter 100 is in thermal contact with the cooling device,

[0100] During a step E2400, an electrical connector 300 comprising a first 310 and a second 330 busbar, said electrical connector being designed to electrically connect said voltage converter 100 to at least one electrical network via said first and said second busbar is obtained,

[0101] During step E2500, the electrical connector 300 is attached to the housing 200,

[0102] During a step E2600, the first omnibus bar 310 is brought into contact thermal with the cooling device via the outside of the case 200.

[0103] During a step E2700, the second busbar 330 is brought into thermal contact with the cooling device via the outside of the housing 200.

[0104] It should also be noted that the invention is not limited to the embodiments described above. It will indeed be apparent to those skilled in the art that various modifications can be made to the embodiments described above, in light of the information just disclosed to them.

[0105] For example, the voltage converter could be a DC / AC voltage converter, and the electrical connector could be suitable only for electrically connecting the voltage converter 100 to the second electrical network. In other words, in this embodiment, the electrical connector would comprise only the second positive busbar and the negative busbar, said second positive busbar being in thermal contact for cooling with the exterior of the electrical conversion system housing.

[0106] According to another example, the voltage conversion system 100 might not have a cooling channel and might only include a heat sink. In this embodiment, the base 210 and the support wall 230 form a single piece.

[0107] Furthermore, the terms used in the claims should not be interpreted as limited to the elements of the embodiments described above, but should instead be interpreted as including all equivalent elements that are predictable by a person skilled in the art applying their knowledge general.

Claims

Demands

1. Voltage conversion system (1000) comprising: a. a voltage converter (100), b. a housing (200) comprising a cooling device, said voltage converter (100) being positioned inside said housing (200) so as to be in thermal contact with said cooling device, and c. an electrical connector (300) comprising a first (310) and a second busbar (330), said electrical connector (300) being designed to electrically connect said voltage converter (100) to at least one electrical network via said first (310) and said second busbar (330), said system being characterized in that said first busbar (310) is in thermal contact with said cooling device via the outside of said housing (200).

2. Voltage conversion system (1000) according to the preceding claim wherein the electrical connector (300) further comprises a first (312) and a second (332) connection terminal, said first busbar (310) and said second busbar (330) being capable of being mechanically and electrically connected to said at least one electrical network via said first connection terminal (312) and said second connection terminal (332) respectively.

3. Voltage conversion system (1000) according to any one of the preceding claims wherein said second busbar (330) is in thermal contact with said cooling device through the outside of said housing (200).

4. Voltage conversion system (1000) according to any one of the preceding claims wherein said first busbar (310) and / or said second busbar (330) is formed in a single piece, i.e. in continuity of material.

5. Voltage conversion system (1000) according to any one of the preceding claims, wherein a portion of said first busbar (310) and / or said second busbar (330) is located at the inside of said case.

6. Voltage conversion system (1000) according to any one of the preceding claims wherein the electrical connector (300) comprises an overmolding (350) of electrically insulating material, for example plastic, said overmolding (350) overmolding at least partially the first (310) and the second (330) busbar.

7. Voltage conversion system (1000) according to any one of the preceding claims wherein the housing (200) further comprises a support tray (230) capable of delimiting a first volume (PV1) of the housing (200) in which a cooling fluid is intended to circulate to cool said voltage converter (100) relative to a second volume (PV2) of the housing (200) in which said voltage converter (100) is positioned.

8. Voltage conversion system (1000) according to the preceding claim in which said housing (200) comprises a coolant inlet (240), a coolant outlet (250) and said first volume (PV1) comprises at least one cooling channel connecting said coolant inlet (240) to said coolant outlet (250).

9. Voltage conversion system according to the preceding claim in which the housing comprises a base (210) and a peripheral side wall (220) surrounding said base (210) and in which the cooling channel is delimited at least in part by said support tray (230) and / or said base (210) and / or said peripheral side wall (220) and / or by at least one wall (260) extending between said base (210) and said support tray (230).

10. System (1000) according to the preceding claim in which said peripheral side wall (220), said support plate and said walls (240, 250) extending between said bottom (210) and said support plate (230) are made in continuity of material, for example by a casting process.

11. Voltage conversion system (1000) according to any one of the preceding claims wherein said first busbar (310) is in thermal contact with said cooling device through the outside of said housing (200) via a thermally conductive connecting element, for example by a thermally conductive paste or by a thermal pad (410, 430).

12. Voltage conversion system (1000) according to any one of the claims previous in which said cooling device comprises a base having a first face intended to receive heat to be dissipated emitted by said voltage converter, and at least one fin extending over a second face of the base opposite the first face, said first face of the base being turned towards the inside of the housing, said first bus bar being in thermal contact with said second face of the base.

13. Voltage conversion system (1000) according to any one of the preceding claims wherein the electrical connector (300) further comprises a first auxiliary connection terminal (314), said first busbar (310) and said second busbar (330) being capable of being mechanically and electrically connected to said at least one electrical network via said first auxiliary connection terminal (314) and said second connection terminal (332) respectively.

14. A method for manufacturing (2000) a voltage conversion system (1000) according to any one of the preceding claims comprising: a. obtaining (E2100) a voltage converter (100), b. obtaining (E2200) a housing (200) comprising a cooling device, c. the positioning (E2300) of the voltage converter in said housing so that said voltage converter is in thermal contact with said cooling device, d. the provision (E2400) of an electrical connector (300) comprising a first (310) and a second (330) busbar, said electrical connector (300) being designed to electrically connect said voltage converter (100) to at least one electrical network via said first (310) and said second (330) busbar, e. thermal contact (E2600) of said first busbar (310) with said cooling device via the outside of said housing (200).

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