Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F17/00—Fixed inductances of the signal type 
  • H01F17/04—Fixed inductances of the signal type  with magnetic core
  • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
  • H01F17/062—Toroidal core with turns of coil around it
• • 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
  • H01F27/02—Casings
  • H01F27/025—Constructional details relating to 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
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/2895—Windings disposed upon ring cores

Definitions

• Assembly comprising a toroidal core choke and a heat sink
• the present invention relates to an assembly comprising a toroidal core choke and a heat sink.
• Chokes are used in many areas of power supply for electrical and electronic devices, in power electronics and in low and high frequency technology.
• the chokes are designed as coils made of an electrically conductive material.
• chokes often include a soft magnetic core.
• a known design of chokes with a soft magnetic core is represented by so-called toroidal chokes.
• electrical conductors are wound onto soft magnetic toroidal cores.
• the inductive resistance of the coil is increased by the soft magnetic core.
• an assembly comprising a toroidal core choke and a heat sink.
• the toroidal core choke comprises a toroidal core and an electrical conductor surrounding the toroidal core, wherein the toroidal core has an axial direction and a central ring opening and wherein a first annular surface and a second annular surface facing away from the first annular surface are formed on the toroidal core, the assembly furthermore comprises a heat sink made of thermally conductive material with a top side, the toroidal core choke being arranged on the top side of the heat sink and the second surface of the ring core facing the top side of the heat sink.
• cooling elements are formed on the heat sink that protrude from the top of the heat sink, with recesses being formed in the toroidal core, each of the cooling elements being arranged in one of the recesses of the toroidal core and thus protruding into the toroidal core.
• the assembly according to the invention has the advantage that the heat from the toroidal core can be dissipated particularly well and easily to the heat sink through the cooling elements in the recesses of the toroidal core.
• the assembly enables inexpensive and very efficient cooling of the toroidal core and thus the toroidal core choke.
• the toroidal core choke can advantageously be cooled in the assembly without the magnetic flux in the coil being eliminated by the cooling.
• the cooling elements are rod-shaped.
• Rod-shaped cooling elements can be manufactured particularly easily.
• Rod-shaped cooling elements can also be inserted particularly easily into the complementary recesses in the toroidal core and the assembly can thus be manufactured particularly easily.
• each of the cooling elements has an outer surface that is complementary to an inner surface of the Ring core is formed in the recess in which the respective cooling element is arranged, so that each cooling element is in indirect and / or direct contact on its outer surface with the inner surface of the ring core in the associated recess.
• an advantageously large-area contact area is produced between the cooling elements and the toroidal core, as a result of which the heat can be transferred particularly well from the toroidal core to the cooling elements and thus to the heat sink.
• the heat from the toroidal core choke can thus be dissipated particularly well.
• the outer surfaces of the cooling elements and the inner surfaces of the ring core are cylindrical. This results in particularly simple shapes that can be produced, for example, by simple drilling.
• the cooling elements can be inserted and fitted into the recesses in a particularly simple manner.
• the cooling elements extend away from the top of the cooling body, parallel to the axial direction of the ring core, into the recesses. This ensures that the magnetic flux in the toroidal core is not eliminated.
• the assembly can be manufactured by simply pushing or pressing the cooling elements into the recesses in the toroidal core.
• the recesses in the ring core are formed around the central ring opening.
• the recesses and thus also the cooling elements are well distributed over the toroidal core and the heat can advantageously be dissipated evenly from all areas of the toroidal core from the toroidal core choke to the heat sink.
• the cooling elements are arranged in a circle in a plane perpendicular to the axial direction, the circle being designed in particular concentric to the ring body.
• the magnetic flux in the toroidal core is only minimally disturbed and a very high level of heat dissipation can still be ensured through a large number of cooling elements.
• the cooling elements protrude perpendicularly from a flat support surface on the top of the heat sink, the support surface being arranged parallel to the second surface of the toroidal core and spaced from the second surface by a gap, the electrical conductor passing through the gap.
• the recesses are designed as blind holes.
• Such a toroidal core can be manufactured particularly easily by means of bores.
• the cooling elements can be inserted particularly easily into such recesses.
• the bottom of the recesses can also serve as a stop for the cooling elements. This increases the contact area between the cooling elements and the toroidal core and can also be used to define the gap between the second surface and the support surface.
• the cooling elements protrude to at least 50%, preferably to at least 75%, particularly preferably to at least 90% of the extension of the toroidal core in the axial direction into the toroidal core. In this way, a particularly good dissipation of the heat from the toroidal core can be ensured.
• FIG 3 shows a further cross section through the exemplary embodiment of the assembly according to the invention.
• FIG 1, 2 and 3 show an exemplary embodiment of the assembly 1 according to the invention shown.
• Figure 2 a section along the axial direction A, the embodiment of the assembly 1 is shown.
• Fig. 3 a section through the embodiment of the assembly 1 perpendicular to the axial direction A is shown.
• the assembly 1 can be used, for example, as a common mode choke or push-pull choke in a large number of power electronic components, such as inverters or DC / DC converters.
• the assembly 1 can, for example, in filters with common-mode chokes, which are in cup transformer topology or
• Pot transformer technology are built up, are used.
• the toroidal core choke 5 can be used, for example, in passive electrical filters to suppress undesired high-frequency interference. Another area of application is the use as a transformer.
• the assembly 1 comprises a toroidal core choke 5 and a heat sink 20, which is provided for cooling the toroidal core choke 5.
• the toroidal core choke 5 comprises a toroidal core 10.
• the toroidal core 10 is designed, for example, in the form of a ring or toroid.
• the toroidal core 10 has an axial direction A.
• the toroidal core 10 has a central ring opening 18.
• a first annular surface 11 and a second annular surface 12 are formed on the toroidal core 10.
• the first annular surface 11 faces away from the second annular surface 12.
• the annular surfaces 11, 12 extend annularly around the central annular opening 18.
• the annular surfaces 11, 12 are spaced apart from one another in the axial direction A by the extension a of the annular core 10.
• the annular surfaces 11, 12 are flat in this exemplary embodiment and, for example, are designed plane-parallel to one another.
• the annular surfaces 11, 12 are congruent with one another.
• the annular surfaces 11, 12 delimit the toroidal ring core 10 in the axial direction A.
• the toroidal core 10 is made of a soft magnetic material.
• a soft magnetic material is classified by in the standard IEC 60404-1.
• the toroidal core 10 can be a ferrite or powder toroidal core or, for example, also consist of crystalline or amorphous metal strips.
• the toroidal core 10 forms a closed magnetic circuit, the magnetic flux propagating almost exclusively in the ring-shaped toroidal core 10.
• the toroidal core choke 5 also includes an electrical conductor 6.
• the electrical conductor 6 is wound onto the toroidal core 10, for example.
• the toroidal core choke 5 can for example comprise only one electrical conductor 5, but it can also comprise several electrical conductors 5 wound on the toroidal core 10.
• the electrical conductor 6 together with the toroidal core 10 forms a toroidal coil, which is also referred to, for example, as a circular ring coil or ring coil.
• the heat sink 20 is made of a thermally conductive material, for example aluminum.
• Cooling elements 22 are formed on the heat sink 20.
• the cooling elements 22 are formed in one piece with the cooling body 20.
• the cooling elements 22 protrude from an upper side 21 of the cooling body 20 in the direction of the toroidal core choke 5. In doing so, they protrude cooling elements 22 into the toroidal core 10 of the toroidal core choke 5.
• recesses 14 complementary to the cooling elements 22 are formed in the toroidal core 10.
• the recesses 14 are cavities in the toroidal core 10, which extend from the second surface 12 of the toroidal core 12 in the direction of the first surface 11 of the toroidal core 12.
• the recesses 14 can, as in the exemplary embodiment shown in the figures, be designed as blind holes so that they are open on the second surface 12 but are closed on the first surface 11.
• the recesses 14 can, however, also be designed as through bores and be open both on the second surface 12 and on the first surface 11.
• the cooling elements 22 and the recesses 14 are, for example, cylindrical.
• the cooling elements 22 have cylindrical outer surfaces 23.
• the toroidal core 10 has cylindrical inner surfaces 15 delimiting the recesses 14.
• the inner surfaces 15 of the toroidal core 10 are in direct contact with the cooling elements 22. In this way, heat can be conducted from the toroidal core 10 via the inner surfaces 15 of the toroidal core 10 to the outer surfaces 23 of the cooling elements 22.
• the toroidal core 10 thus surrounds the cooling elements 22 in the plane E perpendicular to the axial direction A.
• the cooling elements 22 are rod-shaped in the embodiment shown in the figures.
• the longitudinal axes of the rod-shaped cooling elements 22 are aligned parallel to the axial direction A.
• the longitudinal axes of the rod-shaped cooling elements 22 all run parallel to one another.
• the cooling elements 22 are arranged around the central ring opening 18.
• the cooling elements 22 are arranged in a circle. As in the exemplary embodiment shown in the figures, this circle can be arranged concentrically to the annular surfaces 11, 12.
• the cooling elements 22 are arranged in the circle in the plane E with equal distances between successive cooling elements 22.
• the cooling elements 22 protrude into the toroidal core 10 in the axial direction A.
• the distance a between the plane-parallel arranged annular surfaces 11, 12 is measured in the axial direction A.
• the cooling elements 22 can protrude into the toroidal core 10 from the second surface 12, for example at least 50% of the distance a, parallel to the axial direction A.
• the cooling elements 22 can, for example, also protrude into the toroidal core 10 parallel to the axial direction A at least 75% of the distance a from the second surface 12.
• the cooling elements 22 can, for example, also protrude into the toroidal core 10 parallel to the axial direction A at least 90% of the distance a from the second surface 12.
• the cooling elements 22 can, for example, also protrude through the toroidal core 10 from the second surface 12 parallel to the axial direction A up to the first surface 11.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Coils Or Transformers For Communication (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=73043238

Family Applications (1)

Country Status (4)

Family Cites Families (6)

• 2019
  • 2019-11-06 DE DE102019217076.5A patent/DE102019217076A1/de active Pending
• 2020
  • 2020-10-28 WO PCT/EP2020/080258 patent/WO2021089377A1/de unknown
  • 2020-10-28 EP EP20800595.9A patent/EP4055619A1/de active Pending
  • 2020-10-28 CN CN202080076913.5A patent/CN114600206A/zh active Pending

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