Arrangement for heat exchange

An arrangement for exchanging heat between two bodies comprises a circuit board, having at least one first via and at least one second via, wherein at least one heat exchange structure is integrated in the circuit board, wherein the at least one heat exchange structure comprises two heat exchange layers and an intermediate layer arranged between the two heat exchange layers, wherein the two heat exchange layers are thermally joined to each other and electrically separated from each other by the intermediate layer, wherein a first heat exchange layer is associated with the first body and can be brought into thermal contact with it and a second heat exchange layer is associated with the second body and can be brought into thermal contact with it, wherein the at least one first via and the at least one second via are each led through the two heat exchange layers and the intermediate layer arranged between the two heat exchange layers, wherein the at least one first via is in contact only with the first heat exchange layer and is insulated from the second heat exchange layer, and wherein the at least one second via is in contact only with the second heat exchange layer and is insulated from the first heat exchange layer.

BACKGROUND

Technical Field

Embodiments of the invention specify an arrangement for exchanging heat between two bodies.

Description of the Related Art

An electrical device may comprise a circuit board which is arranged between two bodies and adapted to allow an exchange of heat between the two bodies.

Publication KR 20020086000 A shows a method of manufacturing a circuit board.

A cooling system for a data center is known from the document US 2019/0166715 A1.

In document US 2019/0215948 A1, a method is described for realizing a thermal dissipation.

Against this background, one problem was to improve a transport of heat between two bodies.

BRIEF SUMMARY

Some embodiments exchange and/or transport heat between two thermal bodies or components. This arrangement comprises a circuit board, having at least one first via and at least one second via. At least one heat exchange structure is integrated in the circuit board, which in turn comprises at least two heat exchange layers and an intermediate layer arranged between the two heat exchange layers. It is provided that the two heat exchange layers are thermally joined to each other on the one hand and electrically separated from each other on the other hand by the intermediate layer. Furthermore, a first heat exchange layer of the two heat exchange layers is associated with the first body and can be brought into thermal contact with it. A second heat exchange layer of the heat exchange structure, on the contrary, is associated with the second body and can be brought into thermal contact with it. The at least one first via is in contact only with the first heat exchange layer of a respective heat exchange structure and is insulated from the second heat exchange layer of this heat exchange structure. On the other hand, the at least one second via is in contact only with the second heat exchange layer of the heat exchange structure and is insulated from the first heat exchange layer of this heat exchange structure.

Each via is configured as a thermal through-contact and/or can be designated as such. In an embodiment, the at least one first via and the at least one second via are each led through the two heat exchange layers and the intermediate layer arranged between the two heat exchange layers.

The two heat exchange layers and the intermediate layer located between them are by definition arranged one on top of the other, and accordingly layered. It is provided that each of the two heat exchange layers is configured to transport heat in one area of the heat exchange layer of the circuit board and thus to disperse it in two dimensions.

In one embodiment, the circuit board comprises at least two heat exchange structures and at least one core, which is arranged between the at least two heat exchange structures, being formed as boards for example, or designated as such. The heat exchange layers and the at least one core are arranged one on top of the other, or layered. Each via is led through the at least one core. The vias are configured or designed to transport heat through the core, through which they are led. Hence, the vias conduct the heat through the at least one core. Furthermore, the intermediate layer is already thermally conductive, due to its thin conformation. The vias stand in thermal and electrical contact with only one of the two heat exchange layers of a heat exchange structure and transmit heat accordingly. By providing different vias, i.e., the at least one first via and the at least one second via, which differ from each other in that they are associated with either the first or the second thermal body, a transport of heat through the core is possible. Furthermore, a required electrical insulation is thus provided. The respective intermediate layer is made of the same material as the core and therefore is accordingly only slightly thermally conductive. However, it is much thinner than the core, so that it is suitable for a heat exchange between the two respective heat exchange layers of a respective heat exchange structure.

The circuit board comprises for example the following layout: a first heat exchange layer, a first intermediate layer and a second heat exchange layer, all of them forming the first heat exchange structure, the core, a third heat exchange layer, a second intermediate layer and a fourth heat exchange layer, forming the second heat exchange structure. In this case, the circuit board is configured in four layers and has four heat exchange layers. Each via or thermal through-contact is led transversely and/or perpendicularly through the circuit board.

By providing first vias and thus first thermal through-contacts as well as also second vias or second thermal through-contacts, a distinction is made between two kinds of vias, but all of them are led through the circuit board and thus through the heat exchange layers and the core, said different vias being distinguished from each other by the further components of the arrangement to which they are electrically connected and from which they are electrically separated.

It is provided that the two heat exchange layers are electrically insulated from each other by the intermediate layer situated between the heat exchange layers. Furthermore, the electrical insulation of a via within a respective heat exchange layer is achieved for example by annular clearances or corresponding insulating elements.

The proposed arrangement is designed to exchange heat between a heat source, as the first body for example, and a heat sink as the second body, where the two bodies have different temperatures.

The vias by which one of the two heat exchange layers of the respective heat exchange structure is connected to the heat source or the heat sink are designed to transport heat through further layers of the circuit board, such as the core, without thereby affecting the electrical insulation between the two heat exchange layers. It is possible for the first vias, being so-called hot vias, to be electrically connected only to the first body, such as a heat source, whereas the second vias, being so-called cold vias, are electrically connected only to the second body, such as a heat sink.

In an embodiment, the first heat exchange layer of an upper heat exchange structure makes thermal contact by a first thermal interface with the first of the two bodies and the second heat exchange layer of the upper heat exchange structure makes thermal contact by vias or thermal through-contacts and by a second thermal interface with the second of the two bodies. Furthermore, the first heat exchange layer of the lower heat exchange structure makes thermal contact by the first thermal interface and by vias or thermal through-contacts with the first of the two bodies and the second heat exchange layer of the lower heat exchanger makes thermal contact by the second thermal interface with a second one of the two bodies.

In a further embodiment, it is possible for a first or hot via to be connected electrically to the heat source across the first thermal interface, while a second cold via is electrically connected to the heat sink across the second thermal interface. In this case, it is possible for the circuit board to be connected at least in one region across the first thermal interface to the first body and at least in one region across the second thermal interface to the second body.

Usually the circuit board comprises multiple boreholes, each borehole being formed for one via, which is led through the respective borehole. Accordingly, the heat exchange layers, the intermediate layers and the core also comprise multiple parallel arranged boreholes for one respective via. The via which is led through a respective borehole of a heat exchange layer is directly connected, within this borehole of a heat exchange layer with which it makes contact, to that heat exchange layer. On the other hand, this via is separated, within the borehole of a heat exchange layer from which it is insulated, by the clearance, such as insulation, from that heat exchange layer.

Within a heat exchange structure comprising two heat exchange layers, between which the intermediate layer is situated, it is provided that each via is in thermal and electrical contact with only one of the two heat exchange layers through which it is led. On the other hand, it is thermally and electrically insulated from the other heat exchange layer of the respective heat exchange structure through which it is led. An electrical insulation is achieved in that the via has an annular clearance from the surrounding heat exchange layer, formed as a copper surface for example, and it is thus insulated or thermally and electrically separated from it.

The heat exchange layers of a respective heat exchange structure, being components of the circuit board, such as a standard circuit board, are made of copper. The vias led through the heat exchange layers, the intermediate layers and the core of the circuit board, or corresponding thermal through-contacts, are made of a thermally conductive material, such as copper, and may be filled with another thermally conductive material, such as tin, for optimization. A respective thermal interface between the circuit board and a respective body is made from any given thermal interface material. In the arrangement, it is provided that the usually necessary electrical insulation or isolation has been placed in the circuit board, such as a circuit card, so that the thermal interface material can be optimized in terms of its thermal properties. It is therefore unnecessary to employ thermal interface material which is thermally conductive, yet electrically insulated.

Furthermore, the intermediate layer of the at least one heat exchange structure is made of insulation material. The core which may be present is likewise made of insulation material. On the other hand, the vias are both thermally and electrically conductive.

The circuit board has a first, upper side and a second, lower side, with the first heat exchange structure of the circuit board ending at the upper side and the second heat exchange structure of the circuit board ending at the second side, or being bounded or closed off by the respective side. Furthermore, the circuit board is directly or indirectly connected by its upper side to the first body and by its lower side to the second body.

The circuit board in one embodiment has a first region at or on the upper side and a second region at or on the lower side, each respective region being arranged on the respective side. It is proposed that the two regions are arranged with an offset from each other. The first region on the upper side is associated with and/or facing toward the first body and is usually connected directly or indirectly to it, and the second region on the lower side is associated with and/or facing toward the second body and is usually connected directly or indirectly to it.

In one possible embodiment of the arrangement, it is possible for the circuit board, arranged between the two bodies, to have two respective regions on its two sides, a first region partially surrounding a second region. In this case, the first region on the upper side is connected to the first body and on the lower side to the second body. Vias are led only through the first region. The two bodies here are arranged parallel to each other.

Furthermore, the two bodies are situated at an offset with respect to the arrangement in one embodiment, the proposed arrangement being arranged with the circuit board between the two relatively offset bodies or being located between them.

In one embodiment, one of the two usually thermal bodies is configured as a heat source or is designated as such and the second usually thermal body is configured as a heat sink or is designated as such, the arrangement being designed during its operation to transport heat from the body designed as the heat source to the body designed as the heat sink. It is conceivable that, depending on the mode of functioning of the bodies and depending on the respective prevailing temperature, the body having a higher temperature is configured as the heat source or is designated as such and the other body, having a lower temperature, is configured as the heat sink or is designated as such. Regardless of this, the arrangement is adapted to transfer or transport heat either from the first to the second body or vice versa from the second to the first body. The heat will be transferred or transported by the arrangement through the vias perpendicularly and through the heat exchange layers in the plane of the circuit board.

In another embodiment, the arrangement comprises two electrically conductive and thus not electrically insulating thermal interfaces, the circuit board being, at least in one region, connected indirectly across the first thermal interface to the first body. Moreover, the circuit board in at least one region is connected at least indirectly across the second thermal interface to the second body. In this case, a respective thermal interface is arranged between a respective body and the side of the circuit board, such as the described region.

In another embodiment of the arrangement, at least one via which is led through the at least one intermediate layer is configured as a fastening element, such as a screw or bolt, being shaped as a rod at least for a portion. In this case, it is possible for the circuit board to be connected by the fastening element to at least one of the bodies.

Moreover, it is possible for the intermediate layer between two heat exchange layers to be made of plastic, a fiber composite, or a so-called prepreg and/or casting resin.

Of course, the above mentioned features and those yet to be explained below can be used not only in the particular indicated combination, but also in other combinations or standing alone, without leaving the scope of the present invention.

The figures shall be described in connection with each other. The same components are given the same reference numbers.

DETAILED DESCRIPTION

The device200shown schematically byFIG.1is known from the prior art. This device200comprises a heat source202and a heat sink204. Between the heat source202and the heat sink204there are arranged here a first thermal interface206, not being electrically insulating, and a second thermal interface208, being electrically insulating. Between these two thermal interfaces206,208there is arranged a circuit board210. The circuit board210comprises a core212, which is arranged between two structures, each structure comprising a first copper layer214and a second copper layer216, and between said two copper layers214,216there is arranged a prepreg218.

Furthermore, vias220a,220bor thermal through-contacts are led through the circuit board210.FIG.1further shows possible problems in the implementing of the electrical insulation of the thermal interface208, such as creep paths at the edge, defects222or electrically conductive particle inclusions226.

This device200has a conventional layout of vias220a,220b. Furthermore, it is provided that the thermal interface208needs to be electrically insulating at the heat sink204. But this imposes various requirements on the minimum creep paths within this interface208. Accordingly, no defects are allowed in the thermal interface208. Furthermore, a sideways projection of the thermal interface208is required. If these two conditions are not fulfilled, the thermal interface208must be thick enough to achieve the minimum creep paths. But this has negative impact on the thermal conductivity of the interface208.

If the thermal interface208should become contaminated with metallic particles226during its fabrication, there is a danger that these will push through the thermal interface208. Therefore, high requirements are placed on the cleanliness during the fabrication. A pushing through of metallic particles226can usually be prevented only by a thermal interface in the form of a foil, but not with a paste, since the thermal interface208is not robust enough against such a pushing through when implemented as a paste. The device200shown here has two vias220a,220bbetween the heat source202and the heat sink204. In this case, defects224or bubbles may furthermore occur at the edge of the thermal interface208, but also in an area of the thermal interface208. If metallic particles226push through the thermal interface208, there is a danger of these causing a short circuit.

The first embodiment of the arrangement2is shown schematically inFIG.2afrom the side and in cross section. InFIG.2b, several details of the arrangement2fromFIG.2aare shown further enlarged. This arrangement2is situated between two thermal bodies, here, a first thermal body, which is formed or designated as a heat source4, and a second thermal body, which is formed or designated as a heat sink6, these two bodies being arranged here with an offset from each other. Furthermore, there is arranged here at the heat source4a first thermal interface8, which is electrically non-insulating and electrically conductive. At the heat sink6there is arranged a second thermal interface8, which is likewise electrically non-insulating and electrically conductive.

Furthermore, the arrangement2comprises a circuit board12with a core14, which is arranged in turn between two heat exchange structures. A first heat exchange structure of the circuit board12comprises a first heat exchange layer16, an intermediate layer18formed as a prepreg from casting resin and/or fiber composite, and a second heat exchange layer20, with the prepreg and the intermediate layer18being arranged between the two heat exchange layers16,20. A second heat exchange structure of the circuit board12comprises a third heat exchange layer22, an intermediate layer24formed as a prepreg, and a fourth heat exchange layer26. The heat exchange layers16,20,22,26are made of copper, and the individual heat exchange layers16,20,22,26of the circuit board12, arranged one on top of the other, are shown here schematically next to one another. The heat exchange layers16,20,22,26are by definition congruent with each other or arranged with a slight offset.

Furthermore, the circuit board12comprises, besides the core14, the heat exchange layers16,20,22,26, and the intermediate layers18,24, all of them being arranged parallel to each other, for example layered, nine hot vias36and nine cold vias38. The cold vias38here are electrically connected or bonded to the heat sink6. The hot vias36are electrically connected or bonded to the heat source4. The hot vias36and the cold vias38here are offset from each other, as are the heat source4and the heat sink6.

Within the circuit board12, the first heat exchange structure, the core14or a corresponding board, and the second heat exchange structure are arranged parallel to each other or layered, and furthermore they are arranged one on top of another, for example vertically. Within a respective first heat exchange structure, the first heat exchange layer16, the intermediate layer18and the second heat exchange layer20are layered parallel to and alongside each other, being arranged here vertically on top of one another, for example. Furthermore, in a respective second heat exchange structure, the third heat exchange layer22, the intermediate layer24and the fourth heat exchange layer26are layered parallel to each other and arranged alongside each other, for example vertically on top of one another. The vias36,38or thermal through-contacts are oriented here perpendicular to the circuit board12and are led through holes or boreholes within the circuit board12, i.e., through holes within the heat exchange layers16,20,22,26, within the intermediate layers18,24and within the core14.

It is apparent from the enlarged representations of the four heat exchange layers16,20,22,26shown inFIG.2a, and also shown enlargedFIG.2b, that the first heat exchange layer16and the third heat exchange layer22are each connected directly to or make contact with hot vias36, which are led through the heat exchange layers16,22, yet separated from cold vias38, which are led through the heat exchange layers16,22, this being indicated here by annular clearances39around the cold vias38. Furthermore, the second heat exchange layer20and the fourth heat exchange layer26are respectively separated from hot vias36, which are led through these heat exchange layers20,26(annular clearances39around the hot vias36) and connected to cold vias38, which are led through these heat exchange layers20,26. It is provided here that the hot vias36are in contact by the first thermal interface8with the heat source4. Furthermore, the cold vias38are in thermal contact by the second thermal interface8with the heat sink6.

Moreover,FIG.2ashows first arrows44, which are oriented here perpendicular to the circuit board12or vertically downward and indicate a heat flow through the heat exchange structures and the vias36,38of the circuit board12. Heat flows here, starting from the first heat exchange layer16or the third heat exchange layer22, through a respective intermediate layer18,24, to a second heat exchange layer20or a fourth heat exchange layer26, respectively.

Furthermore,FIG.2ashows arrows46,48, which are oriented here parallel to the heat exchange layers16,20,22,26or horizontally, the arrows46,48here indicating each time a heat flow through a heat exchange layer16,20,22,26in the direction of a cold via38and away from a hot via36. These arrows46,48indicate a two-dimensional dispersion of the heat within the respective heat exchange layer16,20,22,26.

In the first embodiment of the arrangement2, the heat exchange layers16,20,22,26arranged one on top of another are divided into two regions, which are offset from each other. It is provided here that a first region of each heat exchange layer16,20,22,26is associated with or facing toward the heat source4. Moreover, a second region of a respective heat exchange layer16,20,22,26, situated with an offset to the first region, is associated with or facing toward the heat sink6. It is provided here that every first region of each heat exchange layer16,20,22,26has the same number of hot vias36. The positioning of the vias36,38within the regions of the heat exchange layers16,20,22,26may be chosen arbitrarily. The positioning or structure of the vias36,38shown inFIGS.2aand2bis only one of various conceivable variants. In this regard, reference is also made to further variants, such as are shown in the furtherFIGS.3and4. The two different vias36,38here form, for example, a rectangular field, especially a square field, made up of multiple rows and columns, in this case three of them.

Besides the embodiment of the arrangement2presented inFIG.2, two further embodiments are proposed, there being shown schematically inFIG.3only heat exchange layers56,60,62,66for the second embodiment, in a top view. For the third embodiment of the arrangement, once again only heat exchange layers96,100,102,106are shown schematically in a top view inFIG.4.

It is proposed that the second and third embodiment of the arrangement likewise each comprise a circuit board, being configured in accordance with the circuit board12of the first embodiment of the arrangement2for transporting heat between a heat source4and a heat sink6, where the heat source4and the heat sink6in the third arrangement (FIG.4) are distant from each other, corresponding to the representation ofFIG.2a, and moreover also offset from each other, thus being correspondingly distant from each other. On the other hand, in the second arrangement (FIG.3) the heat source4and the heat sink6are arranged directly adjacent to and on top of one another, with a circuit board arranged in between.

In order to implement the second embodiment of the arrangement according toFIG.3, the circuit board comprises a first heat exchange layer56, a first intermediate layer18, a second heat exchange layer60, a core14, a third heat exchange layer62, a second intermediate layer24and a fourth heat exchange layer66.

In the case of the third embodiment of the arrangement according toFIG.4, the circuit board comprises a first heat exchange layer96, an intermediate layer18, a second heat exchange layer100, a core14, a third heat exchange layer102, an intermediate layer24and a fourth heat exchange layer106.

A first variant for heat exchange layers56,60,62,66for thermal heat exchange structures of the alternative circuit board of the second embodiment of the arrangement is shown schematically inFIG.3. These comprise hot vias76and cold vias78, which connect the first heat exchange layer56to the third heat exchange layer62and are led through the core14, arranged in between. Moreover, the vias76,78here connect the second heat exchange layer60to the fourth heat exchange layer66, being led through the core14arranged in between.

In the second embodiment of the arrangement according toFIG.3, it is provided that a respective heat exchange layer56,60,62,66has a first region which is free of boreholes and which consists only of a particular heat exchange layer material, such as copper. This first region is surrounded at least partly by a second region, here a U-shaped region by definition, the second region having boreholes for vias. This means, for the second embodiment of the arrangement, that each time a first region, here a rectangular region, is enclosed on three sides by the second region. It is provided here that each time vias76,78are led only through the second region, the vias76,78being arranged here likewise in U-shape within the second region and enclosing the first region on three sides. The hot vias76are thermally connected to or make contact with only the first and third heat exchange layer56,62and are thermally separated or insulated from the second and fourth heat exchange layer60,66(annular clearances77around the hot vias76). Furthermore, the cold vias78are thermally connected to or make contact with only the second and fourth heat exchange layer60,66and are thermally separated or insulated from the first and third heat exchange layer56,62(annular clearances77around the cold vias78).

Furthermore, the first region of the first heat exchange layer56of the first heat exchange structure of the circuit board is associated with the heat source4. For the fourth heat exchange layer66of a second heat exchange structure of the circuit board it is provided that the first region here is associated with or facing toward the heat sink6.

The second variant for heat exchange layers96,100,102,106for thermal heat exchange structures of the circuit board of the third embodiment of the arrangement is shown schematically inFIG.4. These have hot vias116and cold vias118, which connect the first heat exchange layer96to the third heat exchange layer102and are led through the intermediate layer18, situated in between. Furthermore, the vias116,118connect the second heat exchange layer100to the fourth heat exchange layer106, being led through the intermediate layer24situated in between. The hot vias116here are thermally connected to or make contact with only the first and third heat exchange layer96,102and are thermally and electrically insulated or separated from the second and fourth heat exchange layer100,106(annular clearances117around the hot vias116). Moreover, the cold vias118are thermally connected to or make contact with only the second and fourth heat exchange layer100,106and are thermally and electrically insulated or separated from the first and third heat exchange layer96,102(annular clearances119around the cold vias118).

In the third embodiment of the arrangement, the adjacently arranged heat exchange layers96,100,102,106are divided into two regions, which are offset from each other. It is provided here that a first region of each heat exchange layer96,100,102,106of the first heat exchange structure of the circuit board is associated with or facing toward the heat source4. Moreover, a second region of a respective heat exchange layer96,100,102,106, arranged at an offset from the first region, is associated with or facing toward the heat sink6.

It is additionally provided here that each time the second region of a heat exchange layer96,100,102,106comprises a borehole132for a screw as a fastening element, of which a screw head130is shown here. The cold vias118surround the borehole132in a circle.

As compared to the device200known from the prior art, it is now proposed that in all three embodiments of the arrangement2presented here the electrical insulation has been moved to or is arranged in the circuit board12(PCB). The electrical insulation is provided by the respective two heat exchange structures, between which the core14is arranged, within the circuit board12. Each time, a heat exchange structure comprises two heat exchange layers16,20,22,26,56,60,62,66,96,100,102,106with an intermediate layer18,24arranged in between, through which the respective vias36,38,76,78,116,118are led. Hence, it is possible to design the material of a respective thermal interface8for optimal thermal conductivity. This compensates for the poor thermal conductivity of the heat exchange structures which are integrated in the circuit board12, as compared to traditional thermal vias.

It is possible for a particular embodiment of the arrangement2to be implemented with a standard circuit board technology. Moreover, it is possible to do away with metal insert pieces or corresponding metallic particles as well as blind vias or embedded or buried vias. It is possible to employ safe and established methods for the fabrication of circuit boards12to make the circuit board12of a particular embodiment of the arrangement, thus ensuring reliable electrical insulating properties. The intermediate layers18,24or prepregs are relatively thin and have a thickness of around 100 μm, and good results can be achieved in combination with the two-dimensional nature of the heat exchange structures, despite the suboptimal thermal conduction properties of the mentioned intermediate layers18,24in terms of thermal conductivity. At the same time, heat is transferred along the thermal through-contacts or vias36,38,76,78,116,118which are led through the relatively thick core14. Hot vias36,76,116and thermally and electrically connected to or make contact with only the first and third heat exchange layer16,22,56,62,96,102and are thermally and electrically separated or insulated from the second and fourth heat exchange layer20,26,60,66,100,106(annular clearances39,77,117or insulating elements around the hot vias36,76,116). Moreover, cold vias38,78,118are thermally and electrically connected to or make contact with only the second and fourth heat exchange layer20,26,60,66,100,106and are thermally and electrically separated or insulated from the first and third heat exchange layer16,22,56,62,96,102(annular clearances39,77,119or insulating elements around the cold vias38,78,118).

In one embodiment, as compared to the prior art, it is possible to multiply active areas in the heat exchange structures proposed here when the circuit boards12have multiple layers by enlarging and/or increasing the number of respective heat exchange structures. If the circuit board12, as shown here, comprises two heat exchange structures with a total of four heat exchange layers16,20,22,26,56,60,62,66,96,100,102,106, it is possible to double the active area. It is possible for the active area of a heat exchanger which is integrated in the circuit board12to be larger than a contact area of the heat sink6. A heat dissipation through the comparatively thick core14of the particular circuit board12is provided here by the vias36,38,76,78,116,118, which are led through the circuit board12. Moreover, within each heat exchange layer16,20,22,26,56,60,62,66,96,100,102,106the heat is dispersed or spread out in two dimensions, and then transferred in two dimensions to a respective neighboring layer.

As was shown for the heat exchange layers96,100,102,106of the third embodiment of the arrangement (FIG.4), it is also possible to incorporate existing screw fastening points of the circuit board in a heat removal concept, wherein one bearing surface of a particular outermost heat exchange layer96,106at the screw fastening point is utilized at the same time for the heat transfer. It is possible to design the mechanical connection of the respective outermost heat exchange layer96,106or board to be not electrically insulated, which significantly simplifies the design.

In all three embodiments presented for the arrangement2it is possible to resolve a conflict between the electrical insulation and the thermal conductivity. It is proposed here that the electrical insulation is provided in or within the circuit board12. The thermal interfaces8are provided and designed each time only for a thermal coupling between the heat source4or a corresponding heating body and the particular arrangement, and the heat sink6or a corresponding cooling body.

German patent application no. 10 2020 128729.1, filed Nov. 2, 2020, to which this application claims priority, is hereby incorporated herein by reference, in its entirety.