CN114600206A - Assembly comprising an annular core choke and a cooling body - Google Patents
Assembly comprising an annular core choke and a cooling body Download PDFInfo
- Publication number
- CN114600206A CN114600206A CN202080076913.5A CN202080076913A CN114600206A CN 114600206 A CN114600206 A CN 114600206A CN 202080076913 A CN202080076913 A CN 202080076913A CN 114600206 A CN114600206 A CN 114600206A
- Authority
- CN
- China
- Prior art keywords
- annular core
- annular
- cooling
- core
- upper side
- 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.)
- Pending
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 99
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 230000004907 flux Effects 0.000 description 5
- 230000000295 complement effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
An assembly (1) is proposed, comprising an annular core choke (5) and a cooling body (20), wherein the annular core choke (5) comprises an annular core (10) and an electrical conductor (6) surrounding the annular core (10), wherein the annular core (10) has an axial direction (A) and a central annular opening (18), and wherein a first annular surface (11) and a second annular surface (12) facing away from the first annular surface (11) are formed on the annular core (10), wherein the assembly (1) further comprises a cooling body (20) made of a thermally conductive material having an upper side (21), wherein the annular core choke (5) is arranged on the upper side (21) of the cooling body (20) and the second surface of the annular core (12) faces the upper side (21) of the cooling body (20), wherein a cooling element (22) is formed on the cooling body (20), the cooling elements project from an upper side (21) of the heat sink (20), wherein recesses (14) are formed in the annular core (10), wherein each of the cooling elements (22) is arranged in one of the recesses (14) of the annular core (10) and thus projects into the annular core (10).
Description
Technical Field
The invention relates to an assembly comprising an annular core choke and a cooling body.
Background
Chokes are used in many areas of power supply for electrical and electronic equipment, in power electronics and in low and high frequency technology. The choke is designed here as a coil made of an electrically conductive material.
To increase the inductive resistance, the choke usually comprises a soft magnetic core. A known form of construction of a choke with a soft-magnetic core is here a so-called toroidal core choke. In a toroidal choke, an electrical conductor is wound around a soft-magnetic toroidal core. The inductive resistance of the coil is increased by the soft magnetic core.
Heat is generated in the annular core and the electrical conductor surrounding the annular core, which must be conducted away as optimally as possible. Cooling of the toroidal core is not considered in many cases because the cooling means that cool the toroidal core do not allow short-circuiting the magnetic flux in the toroidal core. Furthermore, the ring core itself is often only difficult to access for cooling devices, since the ring core is surrounded by electrical conductors.
Disclosure of Invention
According to the invention, an assembly comprising an annular core choke and a cooling body is proposed. The annular core choke comprises an annular core and an electrical conductor surrounding the annular core, wherein the annular core has an axial direction and a central annular opening, and wherein a first annular surface and a second annular surface facing away from the first annular surface are formed on the annular core, wherein the assembly further comprises a cooling body made of a thermally conductive material having an upper side, wherein the annular core choke is arranged on the upper side of the cooling body, and the second surface of the annular core faces the upper side of the cooling body. According to the invention, cooling elements are formed on the cooling body, which cooling elements project from the upper side of the cooling body, wherein recesses are formed in the annular core, wherein each of the cooling elements is arranged in one of the recesses of the annular core and projects into the annular core in this way.
Compared to the prior art, the assembly according to the invention has the following advantages: the cooling element in the recess of the annular core can particularly well and easily dissipate heat from the annular core to the cooling body. The assembly enables a low cost and very efficient cooling of the annular core and thereby the annular core choke. Cooling of the annular core choke can be advantageously performed in the assembly without cooling to eliminate the magnetic flux in the coil.
Further advantageous embodiments and refinements of the invention are achieved by the features specified in the dependent claims.
According to an advantageous embodiment, it is provided that the cooling element is designed in the form of a rod. The cooling element in the form of a rod can be produced particularly simply. Furthermore, the cooling element in the form of a rod can be inserted particularly easily into a complementary recess in the annular core, and the assembly can therefore be produced particularly easily.
According to an advantageous embodiment, it is provided that each of the cooling elements has an outer surface which is configured complementarily to the inner surface of the annular core 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 annular core in the associated recess. In this way, an advantageously large contact area is created between the cooling element and the annular core, as a result of which heat can be transferred particularly well from the annular core to the cooling element and thus to the cooling body. The heat can thus be removed particularly well from the annular core choke.
According to an advantageous embodiment, it is provided that the outer surface of the cooling element and the inner surface of the annular core are cylindrically configured. This results in a particularly simple shape which can be produced, for example, by simple drilling. The cooling element can be inserted and fitted into the recess particularly simply.
According to an advantageous embodiment, it is provided that the cooling element extends from the upper side of the cooling body into the recess parallel to the axial direction of the annular core. Thus ensuring that the magnetic flux in the toroidal core is not eliminated. At the same time, the assembly can be manufactured by simply pushing or pressing the cooling element into a recess in the ring core.
According to an advantageous embodiment, it is provided that the recess in the annular core is formed around a central annular opening. The recess and thus the cooling element are thus well distributed over the annular core, and the heat can advantageously be conducted uniformly from all regions of the annular core from the annular core choke to the cooling body.
According to an advantageous embodiment, the cooling elements are arranged in a circle in a plane perpendicular to the axial direction, wherein the circle is in particular configured concentrically to the annular body. The magnetic flux in the toroidal core is therefore only minimally disturbed and a very high heat dissipation can still be ensured by the plurality of cooling elements.
According to an advantageous embodiment, it is provided that the cooling element projects perpendicularly to a planar bearing surface on the upper side of the cooling body, wherein the bearing surface is arranged parallel to the second surface of the annular core and is spaced apart from the second surface by a gap, wherein the electrical conductor extends through the gap.
According to an advantageous embodiment, it is provided that the recess is designed as a blind hole. Such a ring core can be produced particularly simply by drilling. Furthermore, the cooling element can be inserted particularly easily into such a recess. Furthermore, the bottom of the recess may serve as a stop for the cooling element. This improves the contact surface between the cooling element and the annular core and can furthermore be used to define a gap between the second surface and the bearing surface.
According to an advantageous embodiment, it is provided that at least 50%, preferably at least 75%, particularly preferably at least 90%, of the extent of the cooling element in the axial direction of the annular core projects into the annular core. A particularly good removal of heat from the annular core can thus be ensured.
Drawings
Embodiments of the invention are illustrated in the drawings and set forth in detail in the following description.
Figure 1 shows an embodiment of an assembly according to the invention,
figure 2 shows a cross-section of an embodiment of the assembly according to the invention,
fig. 3 shows another cross-section of an embodiment of the assembly according to the invention.
Detailed Description
Fig. 1, 2 and 3 show an embodiment of an assembly 1 according to the invention. In fig. 1 a three-dimensional view of an embodiment of the assembly 1 is shown. Fig. 2 shows a section of an exemplary embodiment of the assembly 1 along the axial direction a. In fig. 3 a cross section of an 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 a push-pull choke in a plurality of power electronic components, for example inverters or DC/DC converters. The assembly 1 can be used, for example, in filters with common-mode chokes which are constructed in cup transformer topology or tank transformer technology. The annular core choke 5 can be used, for example, in a passive electrical filter for suppressing undesired high-frequency interference. Another field of application is the use as transformers.
The assembly 1 comprises an annular core choke 5 and a cooling body 20 which is provided for cooling the annular core choke 5. The annular core choke 5 comprises an annular core 10.
The toroidal core 10 is constructed, for example, in the form of a ring or a toroid. The toroidal core 10 has an axial direction a. The toroidal core 10 has a central annular opening 18. A first annular surface 11 and a second annular surface 12 are formed on the annular core 10. The first annular surface 11 faces away from the second annular surface 12. The annular surfaces 11, 12 extend annularly around a central annular opening 18. The annular surfaces 11, 12 are spaced apart from each other in the axial direction a by the extension a of the annular core 10. The annular surfaces 11, 12 are in the exemplary embodiment formed flat and, for example, plane-parallel to one another. The annular surfaces 11, 12 are congruent with each other. The annular surfaces 11, 12 define in the axial direction a an annular core 10 of toroidal configuration.
The ring core 10 is composed of a soft magnetic material. Soft magnetic materials are classified in the standard IEC 60404-1. The annular core 10 can thus be, for example, a ferrite or powder annular core or can also consist, for example, of a crystalline or amorphous metal strip. The toroidal core 10 forms a closed magnetic circuit in which magnetic flux propagates almost exclusively in the toroidal core 10.
In addition to the annular core 10, the annular core choke 5 also comprises an electrical conductor 6. Electrical conductor 6 is, for example, wound onto a toroidal core 10. The annular core choke 5 may comprise, for example, only one electrical conductor 5, but it may also comprise a plurality of electrical conductors 5 wound onto the annular core 10. Thus, the electrical conductor 6 forms together with the toroidal core 10 a toroidal coil, also referred to as toroidal coil or toroidal coil, for example.
The heat sink 20 is made of a thermally conductive material, for example aluminum. A cooling element 22 is formed on the heat sink 20. The cooling element 22 is formed integrally with the heat sink 20. The cooling element 22 projects from the upper side 21 of the cooling body 20 in the direction of the annular core choke 5. In this case, it projects the cooling element 22 into the annular core 10 of the annular core choke 5. For this purpose, recesses 14 are formed in the annular core 10, which recesses are complementary to the cooling elements 22. The recess 14 is a cavity in the annular core 10, which extends from the second surface 12 of the annular core 12 in the direction of the first surface 11 of the annular core 12. Here, as in the embodiment shown in the figures, the recess 14 can be configured as a blind hole, so that it is open at the second surface 12 but closed at the first surface 11. However, the recess 14 may also be configured as a through-hole and open not only at the second surface 12 but also at the first surface 11.
Each cooling element 22, which projects from the upper side 21 of the cooling body 20, projects into a respective recess 14 of the ring core 10, which recess is formed complementary to the respective cooling element 22. For this purpose, the cooling element 22 and the recess 14 are embodied, for example, cylindrically. The cooling element 22 has a cylindrical outer surface 23. The annular core 10 has a cylindrical inner surface 15 defining a recess 14. The inner surface 15 of the annular core 10 is in direct contact with the cooling element 22. Thus, heat may be conducted from the ring core 10 via the inner surface 15 of the ring core 10 to the outer surface 23 of the cooling element 22. Thus, the annular core 10 surrounds the cooling element 22 in a plane E perpendicular to the axial direction a.
The cooling element 22 is of rod-like design in the exemplary embodiment shown in the figures. The longitudinal axis of the cooling element 22 in the form of a rod is oriented parallel to the axial direction a. The longitudinal axes of the cooling elements 22 of rod-like configuration all extend parallel to one another.
The cooling element 22 is arranged around the central annular opening 18. In a plane E perpendicular to the axial direction a, the cooling elements 22 are arranged in a circle. The circle may be arranged concentrically with the annular surfaces 11, 12 as in the embodiment shown in the figures. The cooling elements 22 are arranged in a circle in the plane E with the same spacing between successive cooling elements 22.
The cooling element 22 projects into the annular core 10 in the axial direction a. The spacing a between the planar parallel arranged annular surfaces 11, 12 is measured in the axial direction a. The cooling elements 22 can project from the second surface 12 into the annular core 10, for example, with a distance a parallel to the axial direction a of at least 50%. The cooling elements 22 can also project from the second surface 12 into the annular core 10, for example, at least 75% of the distance a parallel to the axial direction a. The cooling elements 22 can also project from the second surface 12 into the annular core 10, for example, at least 90% of the distance a parallel to the axial direction a. However, the cooling element 22 can also extend, for example, parallel to the axial direction a from the second surface 12 through the annular core 10 to the first surface 11.
Of course, other embodiments and hybrids of the illustrated embodiments are possible.
Claims (10)
1. Assembly (1) comprising an annular core choke (5), wherein the annular core choke (5) comprises an annular core (10) and an electrical conductor (6) surrounding the annular core (10), wherein the annular core (10) has an axial direction (A) and a central annular opening (18), and wherein a first annular surface (11) and a second annular surface (12) facing away from the first annular surface (11) are configured on the annular core (10),
wherein the assembly (1) further comprises a cooling body (20) made of a heat-conducting material having an upper side (21),
wherein the annular core choke (5) is arranged on an upper side (21) of the cooling body (20) and a second surface of the annular core (12) faces the upper side (21) of the cooling body (20),
characterized in that cooling elements (22) are formed on the cooling body (20), said cooling elements projecting from an upper side (21) of the cooling body (20), wherein recesses (14) are formed in the annular core (10), wherein each of the cooling elements (22) is arranged in one of the recesses (14) of the annular core (10) and thus projects into the annular core (10).
2. The assembly according to claim 1, characterized in that the cooling element (22) is of rod-shaped design.
3. The assembly according to any one of the preceding claims, characterized in that each of the cooling elements (22) has an outer surface (23) which is configured complementarily to the inner surface (15) of the annular core (10) in the recess (14), in which recess the respective cooling element (22) is arranged such that each cooling element (22) is in indirect and/or direct contact at its outer surface (23) with the inner surface (15) of the annular core (10) in the associated recess (14).
4. Assembly according to claim 3, characterized in that the outer surface (23) of the cooling element (22) and the inner surface (15) of the annular core (10) are cylindrically configured.
5. The assembly according to any one of the preceding claims, characterized in that the cooling element (22) extends from an upper side (21) of the cooling body (20) parallel to the axial direction (A) of the ring core (10) into the recess (14).
6. Assembly according to any one of the preceding claims, characterized in that the recess (14) is configured in the annular core (10) around the central annular opening (18).
7. The assembly according to any one of the preceding claims, characterized in that the cooling elements (22) are arranged in a circle (28) in a plane (E) perpendicular to the axial direction (A), wherein the circle is configured in particular concentrically to the annular body (10).
8. The assembly according to any one of the preceding claims, characterized in that the cooling element (22) projects perpendicularly to a flat bearing face (26) on an upper side (21) of the cooling body (20), wherein the bearing face (26) is arranged parallel to the second surface (12) of the annular core (10) and is spaced apart from the second surface (12) by a gap (27), wherein the electrical conductor (6) extends through the gap (27).
9. Assembly according to any one of the preceding claims, characterized in that the recess (14) is configured as a blind hole.
10. Assembly according to any one of the preceding claims, characterized in that the cooling element (22) projects into the annular core (10) over at least 50%, preferably at least 75%, particularly preferably at least 90%, of the extent (a) of the annular core (10) in the axial direction (A).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019217076.5A DE102019217076A1 (en) | 2019-11-06 | 2019-11-06 | Assembly comprising a toroidal core choke and a heat sink |
| DE102019217076.5 | 2019-11-06 | ||
| PCT/EP2020/080258 WO2021089377A1 (en) | 2019-11-06 | 2020-10-28 | Assembly comprising a toroidal core inductor and a heat sink |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114600206A true CN114600206A (en) | 2022-06-07 |
Family
ID=73043238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080076913.5A Pending CN114600206A (en) | 2019-11-06 | 2020-10-28 | Assembly comprising an annular core choke and a cooling body |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4055619A1 (en) |
| CN (1) | CN114600206A (en) |
| DE (1) | DE102019217076A1 (en) |
| WO (1) | WO2021089377A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19814897C2 (en) * | 1998-04-02 | 2000-09-21 | Vacuumschmelze Gmbh | Inductive component for high performance |
| JP2007234752A (en) * | 2006-02-28 | 2007-09-13 | Denso Corp | Coil component, and its manufacturing method |
| JP4635982B2 (en) * | 2006-08-09 | 2011-02-23 | 株式会社デンソー | Reactor |
| NL2011129C2 (en) * | 2013-07-09 | 2015-01-12 | Eco Logical Entpr B V | COMPACT ELECTRICAL DEVICE AND ELECTRODYNAMIC LOUDSPEAKER, ELECTRIC MOTOR, SCREENER AND ADJUSTABLE COUPLING BASED ON THEM. |
| FI3330983T3 (en) * | 2016-11-30 | 2023-12-28 | Danfoss Editron Oy | An inductive device |
| US10892082B2 (en) * | 2017-12-12 | 2021-01-12 | Hamilton Sundstrand Corporation | Systems and methods for cooling toroidal magnetics |
-
2019
- 2019-11-06 DE DE102019217076.5A patent/DE102019217076A1/en active Pending
-
2020
- 2020-10-28 WO PCT/EP2020/080258 patent/WO2021089377A1/en unknown
- 2020-10-28 EP EP20800595.9A patent/EP4055619A1/en active Pending
- 2020-10-28 CN CN202080076913.5A patent/CN114600206A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021089377A1 (en) | 2021-05-14 |
| DE102019217076A1 (en) | 2021-05-06 |
| EP4055619A1 (en) | 2022-09-14 |
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