EP4145474A1 - Cooled electrical assembly comprising choke coil - Google Patents
Cooled electrical assembly comprising choke coil Download PDFInfo
- Publication number
- EP4145474A1 EP4145474A1 EP21195266.8A EP21195266A EP4145474A1 EP 4145474 A1 EP4145474 A1 EP 4145474A1 EP 21195266 A EP21195266 A EP 21195266A EP 4145474 A1 EP4145474 A1 EP 4145474A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat conduction
- electrical assembly
- choke coil
- cooled electrical
- liquid cooling
- 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- Withdrawn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
- 238000001816 cooling Methods 0.000 claims abstract description 89
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 239000004020 conductor Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 239000012811 non-conductive material Substances 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/18—Liquid cooling by evaporating liquids
Definitions
- the present invention relates to a cooled electrical assembly comprising a choke coil.
- a required liquid cooling system is complicated, and comprises at least one coolant connection for each choke coil.
- An object of the present invention is to provide a cooled electrical assembly so as to solve the above problems.
- the objects of the invention are achieved by a cooled electrical assembly which is characterized by what is stated in the independent claim.
- the preferred embodiments of the invention are disclosed in the dependent claims.
- the invention is based on the idea of providing a cooled electrical assembly with a heat conduction element that is adapted to conduct heat from an outer surface of a choke coil to a liquid cooling element.
- the heat conduction element is a passive cooling element which does not comprise an inlet and outlet for coolant flow.
- An advantage of the cooled electrical assembly of the invention is that the cooling system is simple yet efficient. Since the heat conduction element is a passive cooling element, there are no coolant connections that could leak in the heat conduction element. Despite the passive structure of the heat conduction element, its cooling capacity is great due to its heat conductive connection with both the outer surface of the choke coil and the liquid cooling element.
- a cooled electrical assembly comprises a liquid cooling element, a plurality of choke coils and a semiconductor switch device such that the liquid cooling element is adapted to cool both the semiconductor switch device and the plurality of choke coils.
- using the liquid cooling element for cooling of the plurality of choke coils does not require any additional coolant connections compared to a situation where the liquid cooling element is adapted to cool exclusively the semiconductor switch device.
- Figure 1 shows a cooled electrical assembly comprising three choke coils 2, a liquid cooling element 4, three heat conduction elements 6, an insulating system, a pressing system, and an electrical device 101.
- Each of the choke coils 2 has a plurality of coil turns wound around a choke centre line.
- the liquid cooling element 4 is adapted for cooling the choke coils 2, and has a first cooling surface 41 that is in heat conducting connection with a first outer surface area 21 of each choke coil 2.
- the choke coils 2 are identical with each other.
- the first cooling surface 41 of the liquid cooling element 4 is a planar surface.
- the choke centre line of each choke coil 2 extends linearly, and is parallel to the first cooling surface 41 of the liquid cooling element 4.
- the choke centre line is an imaginary line.
- Each heat conduction element 6 is a passive element with no inlet or outlet for a cooling liquid circulation.
- Each heat conduction element 6 is in heat conducting connection with the first cooling surface 41 of the liquid cooling element 4, and with a second outer surface area 22 of the corresponding choke coil 2.
- the second outer surface area 22 of the choke coil 2 is located on an opposite side of the choke centre line than the first outer surface area 21.
- each of the plurality of coil turns comprises a first rectilinear section such that the first rectilinear sections form the first outer surface area 21 of the choke coil 2.
- a length of the first rectilinear section is greater than 10% of a total length of the coil turn.
- the first rectilinear sections increase a heat conducting area between the choke coil and the first cooling surface of the liquid cooling element compared to the alternative where the choke coil has a circular cross section on a plane perpendicular to the choke centre line.
- Figure 2 shows the cooled electrical assembly of Figure 1 from a direction parallel to the choke centre lines of the choke coils 2.
- Figure 3 shows the cooled electrical assembly of Figure 1 from a direction perpendicular to the choke centre lines of the choke coils 2.
- a first heat conduction angle ⁇ between the heat conduction element 6 and an outer surface of the choke coil 2 is approximately 105°.
- the first heat conduction angle ⁇ is defined relative to the choke centre line.
- a first heat conduction angle between a heat conduction element and an outer surface of a choke coil is greater than or equal to 90°.
- a dimension of the heat conduction element 6 is equal to a dimension of the plurality of coil turns of the choke coil 2 corresponding to the heat conduction element 6, wherein the longitudinal direction is parallel to the choke centre line of the choke coil 2. Therefore, the plurality of coil turns of the choke coil 2 is entirely located between the heat conduction element 6 and the first cooling surface 41 of the liquid cooling element 4.
- a dimension of at least one heat conduction element is greater than or equal to 50% of a dimension of the plurality of coil turns of at least one choke coil, the longitudinal direction being parallel to the choke centre line of the at least one choke coil.
- the cooled electrical assembly comprises a pump (not shown) adapted to pump cooling liquid through the liquid cooling element 4.
- the liquid cooling element 4 comprises an inlet port 431 and outlet port 432 for the cooling liquid.
- the liquid cooling element 4 and the heat conduction elements 6 are made of aluminium.
- the insulating system electrically insulates the liquid cooling element 4 from the choke coils 2, and each heat conduction element 6 from the corresponding choke coil 2.
- the insulating system comprises an insulating sheet 5 for each choke coil 2, each choke coil 2 being wrapped in a corresponding insulating sheet 5.
- Each insulating sheet 5 is made of an electrically insulating, thermally conducting and flexible material.
- Figures 1 and 3 show, that a longitudinal dimension of the insulating sheet 5 is greater than a longitudinal dimension of the plurality of coil turns of the choke coil 2 inside the insulating sheet 5.
- the insulating sheets 5 are thin sheets. In an embodiment, thickness of the insulating system is less than or equal to 2mm. In another embodiment, thickness of the insulating system is less than or equal to 1mm.
- each choke coil 2 is coated with an insulating varnish.
- the insulating varnish electrically insulates the plurality of coil turns from each other.
- the insulating system is a separate system from the insulating varnish.
- Figure 6 shows one of the choke coils 2 as a separate component.
- the choke coil 2 has a first terminal 271 and a second terminal 272 adapted for connecting the choke coil 2 electrically to an electric circuit (not shown).
- the first terminal 271 and the second terminal 272 extend further in the longitudinal direction than the plurality of coil turns.
- Figure 3 shows that the first terminal 271 and the second terminal 272 extend further in the longitudinal direction than the heat conduction element 6 and the insulating sheet 5.
- Each heat conduction element 6 is heat conductively connected to the liquid cooling element 4 by a first heat conduction area 61 and a second heat conduction area 62 which are located on opposite sides of the first outer surface area 21 of the choke coil 2 corresponding to the heat conduction element 6.
- Figure 2 shows that the first heat conduction area 61 is electrically insulated from the liquid cooling element 4 by the insulating system while the second heat conduction area 62 is in direct heat and electricity conducting connection with the liquid cooling element 4.
- the electrical insulation between the first heat conduction area 61 and the liquid cooling element 4 prevents forming of an electrically conducting loop around the choke coil 2 corresponding to the heat conduction element 6.
- the liquid cooling element 4 is adapted to be grounded. Since each of the heat conduction elements 6 is in electrically conductive connection with the liquid cooling element 4 through the second heat conduction area 62 thereof, the heat conduction elements 6 are also adapted to be grounded.
- the liquid cooling element and the heat conduction elements are made of another electrically conductive material than aluminium.
- the liquid cooling element and heat conduction elements of the cooled electrical assembly are made of electrically non-conductive materials, and there is no separate insulating system.
- the liquid cooling element and the heat conduction elements are injection moulded elements made of thermally conductive plastic materials.
- each of the heat conduction elements 6 There is a plurality of heat pipes embedded in each of the heat conduction elements 6 for enhancing heat conduction from the second outer surface area 22 of the corresponding choke coil 2 to the first cooling surface 41 of the liquid cooling element 4.
- Each of the plurality of heat pipes has an evaporator section located adjacent the second outer surface area 22 of the corresponding choke coil 2, and a condenser section located adjacent the first cooling surface 41 of the liquid cooling element 4.
- passive heat-transfer devices other than heat pipes are embedded in the heat conduction elements.
- the pressing system presses the heat conduction elements 6 towards the first cooling surface 41 of the liquid cooling element 4. Further, the pressing system presses the heat conduction elements 6 towards the choke coils 2. Therefore, the pressing system enhances heat conduction between the heat conduction elements 6 and the first cooling surface 41 of the liquid cooling element 4, and between the heat conduction elements 6 and the choke coils 2.
- the pressing system comprises twelve screws 88, four first type pressing members 501, and two second type pressing members 502.
- the first type pressing members 501 and the second type pressing members 502 are best seen in Figures 4 and 5 which show the cooled electrical assembly of Figure 1 in a disassembled state.
- the screws 88 co-operate with internal threads provided in the liquid cooling element 4.
- the first type pressing members 501 and the second type pressing members 502 distribute pressing forces exerted by the screws 88 to a larger surface area.
- the electrical device 101 is a semiconductor switch device comprising a plurality of semiconductor switches, and has an outer contact area that is in heat conducting connection with a second cooling surface 42 of the liquid cooling element 4, the second cooling surface 42 being located on an opposite side of the liquid cooling element 4 than the first cooling surface 41.
- the outer contact area of the electrical device is in heat conducting connection with the first cooling surface of the liquid cooling element.
- the electrical device is a device other than a choke coil, which generates waste heat during its operation.
- each heat conduction element 6 is adapted to receive one choke coil 2.
- the cooled electrical assembly comprises a heat conduction element which is adapted to receive a plurality of choke coils.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
A cooled electrical assembly comprising at least one choke coil (2) having a plurality of coil turns wound around a choke centre line, a liquid cooling element (4) adapted for cooling the at least one choke coil (2), the liquid cooling element (4) having a first cooling surface (41) that is in heat conducting connection with a first outer surface area (21) of the at least one choke coil (2). The cooled electrical assembly comprises at least one a heat conduction element (6) that is in heat conducting connection with the first cooling surface (41) of the liquid cooling element (4), and with a second outer surface area (22) of the at least one choke coil (2) located on an opposite side of the choke centre line than the first outer surface area (21).
Description
- The present invention relates to a cooled electrical assembly comprising a choke coil.
- It is known in the art to cool a choke coil with a liquid cooling element surrounding the choke coil and/or extending inside the choke coil.
- One of the problems associated with the above arrangement is that a required liquid cooling system is complicated, and comprises at least one coolant connection for each choke coil.
- An object of the present invention is to provide a cooled electrical assembly so as to solve the above problems. The objects of the invention are achieved by a cooled electrical assembly which is characterized by what is stated in the independent claim. The preferred embodiments of the invention are disclosed in the dependent claims.
- The invention is based on the idea of providing a cooled electrical assembly with a heat conduction element that is adapted to conduct heat from an outer surface of a choke coil to a liquid cooling element. The heat conduction element is a passive cooling element which does not comprise an inlet and outlet for coolant flow.
- An advantage of the cooled electrical assembly of the invention is that the cooling system is simple yet efficient. Since the heat conduction element is a passive cooling element, there are no coolant connections that could leak in the heat conduction element. Despite the passive structure of the heat conduction element, its cooling capacity is great due to its heat conductive connection with both the outer surface of the choke coil and the liquid cooling element.
- In an embodiment, a cooled electrical assembly comprises a liquid cooling element, a plurality of choke coils and a semiconductor switch device such that the liquid cooling element is adapted to cool both the semiconductor switch device and the plurality of choke coils. In said embodiment, using the liquid cooling element for cooling of the plurality of choke coils does not require any additional coolant connections compared to a situation where the liquid cooling element is adapted to cool exclusively the semiconductor switch device.
- In the following the invention will be described in greater detail by means of preferred embodiments with reference to the attached drawings, in which
-
Figure 1 shows a cooled electrical assembly according to an embodiment of the invention; -
Figure 2 shows the cooled electrical assembly ofFigure 1 from a direction parallel to choke centre lines of choke coils of the cooled electrical assembly; -
Figure 3 shows the cooled electrical assembly ofFigure 1 from a direction perpendicular to the choke centre lines of the choke coils of the cooled electrical assembly; -
Figure 4 shows the cooled electrical assembly ofFigure 1 in a disassembled state; -
Figure 5 shows the disassembled cooled electrical assembly ofFigure 4 from a direction parallel to the choke centre lines of the choke coils of the cooled electrical assembly; and -
Figure 6 shows a choke coil of the cooled electrical assembly ofFigure 1 . -
Figure 1 shows a cooled electrical assembly comprising threechoke coils 2, a liquid cooling element 4, threeheat conduction elements 6, an insulating system, a pressing system, and anelectrical device 101. Each of thechoke coils 2 has a plurality of coil turns wound around a choke centre line. The liquid cooling element 4 is adapted for cooling thechoke coils 2, and has afirst cooling surface 41 that is in heat conducting connection with a firstouter surface area 21 of eachchoke coil 2. - The
choke coils 2 are identical with each other. Thefirst cooling surface 41 of the liquid cooling element 4 is a planar surface. The choke centre line of eachchoke coil 2 extends linearly, and is parallel to thefirst cooling surface 41 of the liquid cooling element 4. The choke centre line is an imaginary line. - There is one
heat conduction element 6 for each of thechoke coils 2. Eachheat conduction element 6 is a passive element with no inlet or outlet for a cooling liquid circulation. Eachheat conduction element 6 is in heat conducting connection with thefirst cooling surface 41 of the liquid cooling element 4, and with a secondouter surface area 22 of thecorresponding choke coil 2. The secondouter surface area 22 of thechoke coil 2 is located on an opposite side of the choke centre line than the firstouter surface area 21. - In each
choke coil 2, each of the plurality of coil turns comprises a first rectilinear section such that the first rectilinear sections form the firstouter surface area 21 of thechoke coil 2. A length of the first rectilinear section is greater than 10% of a total length of the coil turn. The first rectilinear sections increase a heat conducting area between the choke coil and the first cooling surface of the liquid cooling element compared to the alternative where the choke coil has a circular cross section on a plane perpendicular to the choke centre line. -
Figure 2 shows the cooled electrical assembly ofFigure 1 from a direction parallel to the choke centre lines of thechoke coils 2.Figure 3 shows the cooled electrical assembly ofFigure 1 from a direction perpendicular to the choke centre lines of thechoke coils 2. Referring toFigure 2 , a first heat conduction angle α between theheat conduction element 6 and an outer surface of thechoke coil 2 is approximately 105°. The first heat conduction angle α is defined relative to the choke centre line. In an alternative embodiment, a first heat conduction angle between a heat conduction element and an outer surface of a choke coil is greater than or equal to 90°. - In a longitudinal direction, a dimension of the
heat conduction element 6 is equal to a dimension of the plurality of coil turns of thechoke coil 2 corresponding to theheat conduction element 6, wherein the longitudinal direction is parallel to the choke centre line of thechoke coil 2. Therefore, the plurality of coil turns of thechoke coil 2 is entirely located between theheat conduction element 6 and thefirst cooling surface 41 of the liquid cooling element 4. In an alternative embodiment, in a longitudinal direction a dimension of at least one heat conduction element is greater than or equal to 50% of a dimension of the plurality of coil turns of at least one choke coil, the longitudinal direction being parallel to the choke centre line of the at least one choke coil. - The cooled electrical assembly comprises a pump (not shown) adapted to pump cooling liquid through the liquid cooling element 4. The liquid cooling element 4 comprises an
inlet port 431 andoutlet port 432 for the cooling liquid. - The liquid cooling element 4 and the
heat conduction elements 6 are made of aluminium. The insulating system electrically insulates the liquid cooling element 4 from thechoke coils 2, and eachheat conduction element 6 from thecorresponding choke coil 2. The insulating system comprises aninsulating sheet 5 for eachchoke coil 2, eachchoke coil 2 being wrapped in acorresponding insulating sheet 5. Eachinsulating sheet 5 is made of an electrically insulating, thermally conducting and flexible material.Figures 1 and 3 show, that a longitudinal dimension of theinsulating sheet 5 is greater than a longitudinal dimension of the plurality of coil turns of thechoke coil 2 inside theinsulating sheet 5. - The
insulating sheets 5 are thin sheets. In an embodiment, thickness of the insulating system is less than or equal to 2mm. In another embodiment, thickness of the insulating system is less than or equal to 1mm. - It should be noted that the plurality of coil turns of each
choke coil 2 is coated with an insulating varnish. The insulating varnish electrically insulates the plurality of coil turns from each other. The insulating system is a separate system from the insulating varnish. -
Figure 6 shows one of thechoke coils 2 as a separate component. In addition to the plurality of coil turns, thechoke coil 2 has afirst terminal 271 and asecond terminal 272 adapted for connecting thechoke coil 2 electrically to an electric circuit (not shown). Thefirst terminal 271 and thesecond terminal 272 extend further in the longitudinal direction than the plurality of coil turns.Figure 3 shows that thefirst terminal 271 and thesecond terminal 272 extend further in the longitudinal direction than theheat conduction element 6 and theinsulating sheet 5. - Each
heat conduction element 6 is heat conductively connected to the liquid cooling element 4 by a firstheat conduction area 61 and a secondheat conduction area 62 which are located on opposite sides of the firstouter surface area 21 of thechoke coil 2 corresponding to theheat conduction element 6. -
Figure 2 shows that the firstheat conduction area 61 is electrically insulated from the liquid cooling element 4 by the insulating system while the secondheat conduction area 62 is in direct heat and electricity conducting connection with the liquid cooling element 4. The electrical insulation between the firstheat conduction area 61 and the liquid cooling element 4 prevents forming of an electrically conducting loop around thechoke coil 2 corresponding to theheat conduction element 6. - The liquid cooling element 4 is adapted to be grounded. Since each of the
heat conduction elements 6 is in electrically conductive connection with the liquid cooling element 4 through the secondheat conduction area 62 thereof, theheat conduction elements 6 are also adapted to be grounded. - In an alternative embodiment, the liquid cooling element and the heat conduction elements are made of another electrically conductive material than aluminium. In another alternative embodiment, the liquid cooling element and heat conduction elements of the cooled electrical assembly are made of electrically non-conductive materials, and there is no separate insulating system. In an embodiment, the liquid cooling element and the heat conduction elements are injection moulded elements made of thermally conductive plastic materials.
- There is a plurality of heat pipes embedded in each of the
heat conduction elements 6 for enhancing heat conduction from the secondouter surface area 22 of thecorresponding choke coil 2 to thefirst cooling surface 41 of the liquid cooling element 4. Each of the plurality of heat pipes has an evaporator section located adjacent the secondouter surface area 22 of thecorresponding choke coil 2, and a condenser section located adjacent thefirst cooling surface 41 of the liquid cooling element 4. In an alternative embodiment, passive heat-transfer devices other than heat pipes are embedded in the heat conduction elements. - The pressing system presses the
heat conduction elements 6 towards thefirst cooling surface 41 of the liquid cooling element 4. Further, the pressing system presses theheat conduction elements 6 towards the choke coils 2. Therefore, the pressing system enhances heat conduction between theheat conduction elements 6 and thefirst cooling surface 41 of the liquid cooling element 4, and between theheat conduction elements 6 and the choke coils 2. - The pressing system comprises twelve
screws 88, four firsttype pressing members 501, and two secondtype pressing members 502. The firsttype pressing members 501 and the secondtype pressing members 502 are best seen inFigures 4 and 5 which show the cooled electrical assembly ofFigure 1 in a disassembled state. Thescrews 88 co-operate with internal threads provided in the liquid cooling element 4. The firsttype pressing members 501 and the secondtype pressing members 502 distribute pressing forces exerted by thescrews 88 to a larger surface area. - The
electrical device 101 is a semiconductor switch device comprising a plurality of semiconductor switches, and has an outer contact area that is in heat conducting connection with asecond cooling surface 42 of the liquid cooling element 4, thesecond cooling surface 42 being located on an opposite side of the liquid cooling element 4 than thefirst cooling surface 41. In an alternative embodiment, the outer contact area of the electrical device is in heat conducting connection with the first cooling surface of the liquid cooling element. In another alternative embodiment, the electrical device is a device other than a choke coil, which generates waste heat during its operation. - In the embodiment shown in
Figure 1 , eachheat conduction element 6 is adapted to receive onechoke coil 2. In an alternative embodiment, the cooled electrical assembly comprises a heat conduction element which is adapted to receive a plurality of choke coils. - It will be obvious to a person skilled in the art that the inventive concept can be implemented in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.
Claims (16)
- A cooled electrical assembly comprising:at least one choke coil (2) having a plurality of coil turns wound around a choke centre line;a liquid cooling element (4) adapted for cooling the at least one choke coil (2), the liquid cooling element (4) having a first cooling surface (41) that is in heat conducting connection with a first outer surface area (21) of the at least one choke coil (2),characterized in that the cooled electrical assembly comprises at least one a heat conduction element (6) that is in heat conducting connection with the first cooling surface (41) of the liquid cooling element (4), and with a second outer surface area (22) of the at least one choke coil (2) located on an opposite side of the choke centre line than the first outer surface area (21).
- The cooled electrical assembly according to claim 1, wherein for each of the at least one choke coil (2), a first heat conduction angle (α) between the heat conduction element (6) and an outer surface of the choke coil (2) is greater than or equal to 90°, the first heat conduction angle (α) being defined relative to the choke centre line.
- The cooled electrical assembly according to claim 1 or 2, wherein the at least one heat conduction element (6) is made of an electrically non-conductive material, and the heat conducting connection between the heat conduction element (6) and the first cooling surface (41) of the liquid cooling element (4) is based on a direct contact between them.
- The cooled electrical assembly according to claim 1 or 2, wherein the liquid cooling element (4) is made of an electrically conductive material, and the cooled electrical assembly comprises an insulating system electrically insulating the liquid cooling element (4) from the choke coil (2).
- The cooled electrical assembly according to claim 4, wherein the at least one heat conduction element (6) is made of an electrically conductive material, and the insulating system electrically insulates the at least one heat conduction element (6) from the at least one choke coil (2), and at least partially electrically insulates the at least one heat conduction element (6) from the liquid cooling element (4).
- The cooled electrical assembly according to claim 5, wherein the at least one heat conduction element (6) is connected to the liquid cooling element (4) by a first heat conduction area (61) and a second heat conduction area (62) which are located on opposite sides of the first outer surface area (21) of the at least one choke coil (2).
- The cooled electrical assembly according to claim 6, wherein at least one of the first heat conduction area (61) and the second heat conduction area (62) is electrically insulated from the liquid cooling element (4) by the insulating system in order to prevent forming of an electrically conducting loop around the choke coil (2).
- The cooled electrical assembly according to any one of the preceding claims, wherein there is at least one passive heat-transfer device embedded in the at least one heat conduction element (6) for enhancing heat conduction from the second outer surface area (22) of the choke coil (2) to the first cooling surface (41) of the liquid cooling element (4).
- The cooled electrical assembly according to claim 8, wherein the at least one passive heat-transfer device comprises a heat pipe.
- The cooled electrical assembly according to any one of the preceding claims, wherein the first cooling surface (41) of the liquid cooling element (4) is a planar surface.
- The cooled electrical assembly according to claim 10, wherein the choke centre line of the at least one choke coil (2) extends linearly, and is parallel to the first cooling surface (41) of the liquid cooling element (4).
- The cooled electrical assembly according to claim 10 or 11, wherein each of the plurality of coil turns of the at least one choke coil (2) comprises a first rectilinear section such that the first rectilinear sections form the first outer surface area (21) of the at least one choke coil (2).
- The cooled electrical assembly according to claim 11 or 12, wherein a dimension of the at least one a heat conduction element (6) in a longitudinal direction is greater than or equal to 50% of a dimension of the plurality of coil turns of the at least one choke coil (2) in the longitudinal direction, the longitudinal direction being parallel to the choke centre line of the at least one choke coil (2).
- The cooled electrical assembly according to any one of the preceding claims, wherein the cooled electrical assembly comprises at least one electrical device (101) other than a choke coil, the at least one electrical device (101) having an outer contact area that is in heat conducting connection with the liquid cooling element (4).
- The cooled electrical assembly according to claim 14, wherein the outer contact area of the at least one electrical device (101) is in heat conducting connection with a second cooling surface (42) of the liquid cooling element (4), the second cooling surface (42) being located on an opposite side of the liquid cooling element (4) than the first cooling surface (41).
- The cooled electrical assembly according to any one of the preceding claims, wherein the cooled electrical assembly comprises a pressing system for pressing the at least one a heat conduction element (6) towards the first cooling surface (41) of the liquid cooling element (4), the pressing system comprising a plurality of screws (88).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21195266.8A EP4145474A1 (en) | 2021-09-07 | 2021-09-07 | Cooled electrical assembly comprising choke coil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21195266.8A EP4145474A1 (en) | 2021-09-07 | 2021-09-07 | Cooled electrical assembly comprising choke coil |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4145474A1 true EP4145474A1 (en) | 2023-03-08 |
Family
ID=77666217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21195266.8A Withdrawn EP4145474A1 (en) | 2021-09-07 | 2021-09-07 | Cooled electrical assembly comprising choke coil |
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EP (1) | EP4145474A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080122566A1 (en) * | 2006-11-29 | 2008-05-29 | Honeywell International Inc. | Heat pipe supplemented transformer cooling |
JP2009147041A (en) * | 2007-12-13 | 2009-07-02 | Sumitomo Electric Ind Ltd | Reactor |
JP2009194199A (en) * | 2008-02-15 | 2009-08-27 | Sumitomo Electric Ind Ltd | Reactor and assembly method thereof |
US20130312930A1 (en) * | 2012-05-22 | 2013-11-28 | Lear Corporation | Coldplate for use with a Transformer in an Electric Vehicle (EV) or a Hybrid-Electric Vehicle (HEV) |
US20180077792A1 (en) * | 2015-03-10 | 2018-03-15 | Omron Corporation | Reactor, connection member, board module, and electric device |
-
2021
- 2021-09-07 EP EP21195266.8A patent/EP4145474A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080122566A1 (en) * | 2006-11-29 | 2008-05-29 | Honeywell International Inc. | Heat pipe supplemented transformer cooling |
JP2009147041A (en) * | 2007-12-13 | 2009-07-02 | Sumitomo Electric Ind Ltd | Reactor |
JP2009194199A (en) * | 2008-02-15 | 2009-08-27 | Sumitomo Electric Ind Ltd | Reactor and assembly method thereof |
US20130312930A1 (en) * | 2012-05-22 | 2013-11-28 | Lear Corporation | Coldplate for use with a Transformer in an Electric Vehicle (EV) or a Hybrid-Electric Vehicle (HEV) |
US20180077792A1 (en) * | 2015-03-10 | 2018-03-15 | Omron Corporation | Reactor, connection member, board module, and electric device |
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