EP4285409A1 - Elektronische vorrichtung - Google Patents
Elektronische vorrichtungInfo
- Publication number
- EP4285409A1 EP4285409A1 EP22709580.9A EP22709580A EP4285409A1 EP 4285409 A1 EP4285409 A1 EP 4285409A1 EP 22709580 A EP22709580 A EP 22709580A EP 4285409 A1 EP4285409 A1 EP 4285409A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transmission element
- edges
- connection pad
- rounded
- heat sink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W40/00—Arrangements for thermal protection or thermal control
- H10W40/20—Arrangements for cooling
- H10W40/25—Arrangements for cooling characterised by their materials
- H10W40/255—Arrangements for cooling characterised by their materials having a laminate or multilayered structure, e.g. direct bond copper [DBC] ceramic substrates
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
- H05K1/0204—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/06—Thermal details
- H05K2201/066—Heatsink mounted on the surface of the printed circuit board [PCB]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10416—Metallic blocks or heatsinks completely inserted in a PCB
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W40/00—Arrangements for thermal protection or thermal control
- H10W40/20—Arrangements for cooling
- H10W40/22—Arrangements for cooling characterised by their shape, e.g. having conical or cylindrical projections
Definitions
- the invention relates to an electronic device comprising a thermally and electrically conductive transmission element for dissipating heat from a heat source, the transmission element being at a first electrical potential; a heat sink at a second electrical potential; an electrically insulating layer disposed between the heat sink and the transfer element to thermally conductively connect the heat source to the heat sink.
- Devices of the type mentioned are used to dissipate heat from electronic components, in particular for dissipating and distributing heat from chips or circuit carriers, in particular printed circuit boards (printed circuit boards, PCB).
- the chips or circuit carriers are usually separated from the actual heat sink, for example a structure with cooling fins, by an electrically insulating and thermally conductive layer, for example thermally conductive pads or thermal adhesive.
- the heat is dissipated from the chip, the heat source, via an electrically and thermally conductive transmission element. Since there can be a considerable potential difference (higher than 1 kV) between the PCB/chip and the heat sink, which is normally at ground potential, a strong electric field is formed between the two components. Inhomogeneities in the electric field can lead to local partial discharges that can damage the insulator material and the chip/PCB.
- the object of the invention is to at least alleviate these disadvantages.
- an electronic device of the type mentioned is created, wherein the transmission element has rounded edges.
- an electric field forms in the intermediate space between the transmission element and the heat sink.
- the local strength of the electric field depends on the distance between the potential-carrying surfaces and on the geometry of the surfaces from which the electric field lines emerge.
- the smallest radius defines the maximum field strength, which is why high field strengths occur when there is a potential difference between the transmission element and the heat sink at small radii of the surface geometry.
- the smallest radii occur at sharp edges of the transmission element, which are oriented in the direction of the heat sink and which are caused by the production. Therefore, there is a particularly high risk of partial discharges and therefore damage to the edges at the edges insulation materials.
- Partial discharges occur as a result of field inhomogeneities that cause the dielectric strength of an insulating material to be locally exceeded and electrical charge carriers to flow through the electrically insulating material of the insulating layer and damage it.
- the smallest radii are enlarged by the rounding of the edges of the transmission element, which face the heat sink and thus a different electrical potential, for example ground potential. This avoids local excessive increases in the electric field strength and reduces the risk of previous damage or aging caused by insulation materials, for example in the form of partial discharges.
- the transmission element is at least partially arranged within the insulating layer, and/or the edges of the transmission element, which are arranged within the insulating layer, are rounded.
- edges of the transfer element that face the heat sink and at least partially run in a plane that is parallel to a surface of the heat sink that is opposite the transfer element are rounded.
- the edges that are oriented in the direction of the second potential, the electrical potential of the heat sink, and that lie within the insulating layer are rounded, because the electric field forms between the transmission element and the heat sink. Since, in addition to the radius of the edges, the distance between the edges and the heat sink potential is also decisive for the local field strength, it is most effective to round off the edges that are closest to the heat sink potential.
- the transmission element can be arranged at least partially in the insulating layer or extend into it.
- the transmission element comprises a thermal connection pad of a PCB and a heat spreader, the heat spreader being arranged between the thermal connection pad and the insulating layer and having the rounded edges.
- connection pad prepackage
- insulating layer heat conducting pad
- the sharp edges of the connection pad can be production-related.
- the heat spreader has rounded edges, with the edges in the direction of the heat sink, i.e. in the direction of the other electrical potential, being rounded in order to mitigate field strength excesses.
- the heat spreader can be applied directly to the connection pad of the PCB, which then does not have to have any rounded edges.
- the connection pads commercial PCBs can be equipped with the heat spreaders, creating a
- the edges of the transmission element are rounded according to Borda and/or Rogowski profiles.
- Borda and/or Rogowski profiles have the advantage that the electric field strength increases in the edge area are avoided.
- the geometry of the profiles allows an exact determination of the course of the field lines and thus a prediction of the field properties over a certain distance (in the insulating layer). If Rogowski profiles are used, electrical fields are reduced homogeneously, which helps to prevent local field strength peaks and thus partial discharges. When Borda profiles are used, the electric field is kept constant.
- the transmission element is a thermally and electrically conductive connection pad of a PCB, and/or the edges are rounded off by an electrically conductive coating.
- the electrically conductive coating forms a rounded edge structure.
- the curves of the edges of the transmission element can also be produced subsequently using a potting compound or coating with good electrical conductivity. The effects with regard to the reduced risk of partial discharges are then the same as described above.
- a rounded connection pad can be introduced more easily into the insulating layer.
- Connection pad and insulating layer (the thermally conductive pad) are usually at least partially connected to one another by being pressed in. When pressing in, however, the sharp edges can damage the thermal pad or the connection pad. The risk of this damage is rounded edges also reduced. This applies to all embodiments of the present invention.
- the transmission element is a thermally and electrically conductive connection pad of a PCB, and the edges of the connection pad are rounded off by an electrically non-conductive coating.
- the electrically non-conductive coating forms a rounded edge structure that encloses the edges of the connection pad, with the non-conductive coating having a high dielectric constant.
- the critical radius of the edges of the connection pad is cast and insulated.
- the dielectric material can have a high dielectric constant compared to the insulating layer. This results in a shift of the electrical field into the material with a lower dielectric constant, namely into the insulating layer. In this way, the field strength peaks are "pushed away" by the sharp edges of the connection pad. This reduces the risk of excessive field strength at these edges.
- the transmission element comprises a connection pad and a field plate, the field plate being placed on the connection pad and being arranged between the connection pad and the insulating layer, the ends of the field plate being bent in the direction of the connection pad in such a way that they bend in the direction of the heat sink results in a rounding.
- the rounded edge structure can also be formed by a curved field plate that is placed on the connection pad as a shielding element.
- the field plate forms a heat spreader which has a significantly reduced thickness and whose curves are not formed by removing or adding material from a solid body, but by bending the plate. This saves material.
- Another advantage is that the field plate can easily be subsequently soldered onto the connection pad. Due to the bend/curvature, the pointed ends of the field plate have an increased distance to the opposite electrical potential of the heat sink. The pointed ends can also be bent inwards and thus shielded from the electrical potential of the heat sink.
- the electric field strength is also a function of the distance to the reference potential, the danger of partial discharges is not only reduced by the rounding, but also by the increased distance between the ends of the field plate and the reference potential.
- the heat sink has an area with a geometric structure that corresponds to the mirror image of a geometric structure of the transmission element and is opposite to it, in particular the area being formed by a platform with rounded edges facing the heat source. Due to the mirror-image formation of the heat sink, or an area of the heat sink, which faces the heat source, is covered by the insulating layer and the Transmission element opposite, the electric field can be homogenized overall. However, a more homogeneous electric field has fewer inhomogeneities and therefore fewer areas in which partial discharges can occur. This feature is compatible with all embodiments of the invention and can be effectively combined.
- FIG. 1 shows a generic electronic device from the prior art
- FIG. 2 shows a first exemplary embodiment of the invention
- FIG. 3 shows a further exemplary embodiment according to the invention
- FIGS. 4, 5, 6 and 7 further exemplary embodiments of the invention.
- FIG. 1 shows a generic electronic device 1 from the prior art.
- the electronic device 1 comprises a thermally and electrically conductive transmission element 2, which is connected to a heat source 3, here a printed circuit board, PCB.
- the transmission element 2 is through a connection pad 4 of the PCB 3 is formed.
- the electronic device 1 includes a heat sink 5 which is at GND potential.
- the transmission element 2 is at a higher potential than GND.
- the heat sink 5 which is at GND potential.
- the transmission element 5 and the transmission element 2 are spaced apart from one another by an electrically insulating layer 6 .
- the material of the electrically insulating layer is thermally conductive in order to ensure heat transfer from the heat source 3 through the transmission element 2 and through the electrically insulating layer
- connection pad 2 is arranged inside the insulating layer 6 .
- the connection pad has sharp edges 7. The edges 7 face the heat sink 5 and run perpendicular to the plane of the image.
- FIG. 2 shows a first exemplary embodiment of the electronic device 1 according to the invention.
- the transmission element 2 includes the connection pad 4 and a heat spreader 8 .
- the heat spreader 8 is made of an electrically conductive material and is connected to the connection pad 4 .
- Connection pad 4 and heat spreader are at the same electrical potential, which is increased compared to GND.
- the heat spreader 8 is at least partially arranged within the electrically insulating layer 6 and has rounded edges 9 .
- the heat spreader 8 also has a larger base area than the connection pad 4. The heat spreader 8 therefore protrudes beyond the connection pad.
- the protruding edges 9 of the heat spreader 8 are rounded.
- FIG. 3 shows a second exemplary embodiment of the electronic device 1 according to the invention.
- the transmission element 2 does not have its own heat spreader 8, but the connection pad 4 of the PCB 3 acts as a heat spreader 8.
- the connection pad 4 is arranged in the insulating layer 6, and the production-related sharp edges 7 of the connection pad 4 are rounded, so that the connection pad 4 now has rounded edges 9 .
- the rounded edges 9 point into the image plane and are oriented towards the heat spreader 8 .
- FIG. 4 shows a further exemplary embodiment of the electronic device 1 according to the invention.
- the rounded edges 9 of the connection pad 4 are produced by an electrically conductive coating 10 with which the connection pad 4 is covered before it is connected to the electrically conductive layer 6 .
- the rounded edges 9 produced in this way can also have the geometry of Borda or Rogowski profiles.
- FIG. 5 shows a further exemplary embodiment of the electronic device 1 according to the invention.
- the rounded edges 9 of the connection pad 4 are produced by an electrically non-conductive coating 11 with which the connection pad 4 is covered before it is connected to the electrically conductive layer 6 .
- the sharp edges 7 of the connection pad 4 are cast over and additionally insulated.
- the sharp edges 7 are completely surrounded by the material.
- the material from which the electrically non-conductive coating 11 is made has a high dielectric constant. In any case, points it has a higher relative permittivity and thus a higher dielectric strength than the material from which the insulating layer 6 is made.
- FIG. 6 shows a further exemplary embodiment of the electronic device 1 according to the invention.
- the transmission element 2 includes the connection pad 4 and an electric field plate 12.
- the field plate 12 is soldered onto the connection pad 4.
- FIG. The ends of the field plate 12 are bent in the direction of the heat source 3 (“upwards” in the drawing), resulting in a curve in the direction of the heat sink 5. This curve has the same effect as the rounded edges 9 of the heat spreader 8 or the connection pad 4
- the resulting curves can also be shaped according to Borda or Rogowski profiles.
- FIG. 7 shows a further exemplary embodiment of the electronic device 1 according to the invention.
- the heat sink 5 has a structured area 13 which is opposite an underside of the transmission element 2 and is designed to be a mirror image of a geometry of the underside of the transmission element 2 .
- the structured area 13 is designed as a raised platform and also has rounded edges 14 .
- the rounded edges 14 are embedded in the insulating layer 6 . This embodiment is compatible with all of the aforementioned embodiments.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021000469.8A DE102021000469A1 (de) | 2021-01-30 | 2021-01-30 | Elektronische Vorrichtung |
| PCT/EP2022/051365 WO2022161868A1 (de) | 2021-01-30 | 2022-01-21 | Elektronische vorrichtung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4285409A1 true EP4285409A1 (de) | 2023-12-06 |
Family
ID=80735633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22709580.9A Withdrawn EP4285409A1 (de) | 2021-01-30 | 2022-01-21 | Elektronische vorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12402239B2 (de) |
| EP (1) | EP4285409A1 (de) |
| DE (1) | DE102021000469A1 (de) |
| WO (1) | WO2022161868A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022205497A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Spannungsanpassung in einem Stromversorgungssystem, das einen Wechselrichter mit hoher Leistungsdichte aufweist |
| DE102022205498A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Durchschlagfestigkeit und Hohlraumgröße in elektrischem Isolationsmaterial eines Leistungswandlers |
| DE102022205493A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Halbleiter-zu-Substrat-Spaltdimensionierung in Hochspannungs-Leistungswandlern |
| DE102022205488A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Dimensionierung des Spaltes zwischen Substrat und Kühlkörper in Hochspannungs-Leistungswandlern |
| DE102022205483A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Schnelles Schalten von Transistoren in einem Wandler mit begrenzter Kapazität |
| DE102022205490A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Thermische Schnittstellenmaterialien |
| DE102022205503A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Elektrische Verbindungsanordnung für einen Prepackage- Leistungswandler |
| DE102022205496A1 (de) | 2022-05-31 | 2023-11-30 | Rolls-Royce Deutschland Ltd & Co Kg | Wandler mit einer elektrisch isolierenden und thermisch leitenden Schicht |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2088595A5 (de) | 1970-04-17 | 1972-01-07 | Cii | |
| DE3039440C2 (de) | 1980-10-18 | 1984-02-16 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Anordnung zur Aufnahme von elektrischen und/oder elektronischen Bauelementen |
| JP3491414B2 (ja) | 1995-11-08 | 2004-01-26 | 三菱電機株式会社 | 回路基板 |
| DE19914815A1 (de) | 1999-03-31 | 2000-10-05 | Abb Research Ltd | Halbleitermodul |
| JP3849381B2 (ja) * | 1999-12-20 | 2006-11-22 | 株式会社日立製作所 | 絶縁回路基板の製造方法 |
| DE10117775A1 (de) * | 2001-04-09 | 2002-10-17 | Abb Research Ltd | Leistungshalbleitermodul sowie Verfahren zum Herstellen eines solchen Leistungshalbleitermoduls |
| JP5211801B2 (ja) * | 2008-03-28 | 2013-06-12 | Tdk株式会社 | 電子部品 |
| KR101833651B1 (ko) * | 2013-09-11 | 2018-02-28 | 미쓰비시덴키 가부시키가이샤 | 반도체 장치 및 그 제조 방법 |
| KR20190082604A (ko) * | 2018-01-02 | 2019-07-10 | 삼성전자주식회사 | 반도체 패키지 |
| DE102019214998A1 (de) | 2019-09-30 | 2021-04-01 | Rolls-Royce Deutschland Ltd & Co Kg | Organischer Schaltungsträger und dessen Anwendung bei Stromrichtern und in Fahrzeugen |
-
2021
- 2021-01-30 DE DE102021000469.8A patent/DE102021000469A1/de active Pending
-
2022
- 2022-01-21 EP EP22709580.9A patent/EP4285409A1/de not_active Withdrawn
- 2022-01-21 WO PCT/EP2022/051365 patent/WO2022161868A1/de not_active Ceased
- 2022-01-21 US US18/274,376 patent/US12402239B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022161868A1 (de) | 2022-08-04 |
| US20240098872A1 (en) | 2024-03-21 |
| DE102021000469A1 (de) | 2022-08-04 |
| US12402239B2 (en) | 2025-08-26 |
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