Coil Component, Coil Component Combination, and Method for Manufacturing a Coil Component

Abstract

A coil component includes a cup, a magnetic core, an electric conductor wound around the core, a cover, which closes the cup, and electric terminal contacts, which are in electric contact with ends of the electric conductor. The core and the electric conductor are arranged in the cup and the cup is filled with potting compound.

Claims

1-17. (canceled)

18. A coil component, comprising: a cup; a soft magnetic core; an electric conductor wound around the core; a cover, which closes the cup; and electric terminal contacts, which are in electric contact with ends of the electric conductor, wherein the core and the electric conductor are arranged in the cup, and the cup is filled with potting compound.

19. The coil component as claimed in claim 18, wherein the core is an annular core.

20. The coil component as claimed in claim 18, wherein the coil component has an electrically insulating film, which at least partly covers the cup interior.

21. The coil component as claimed in claim 18, wherein the potting compound contains polyurethane, thermally conductive filler and a hardener and/or contains aluminum oxide powder.

22. The coil component as claimed in claim 18, wherein the cup is made of plastic or of aluminum.

23. The coil component as claimed in claim 18, wherein the cup is circularly cylindrical.

24. The coil component as claimed in claim 18, wherein the cup has a base plate and a sleeve.

25. The coil component as claimed in claim 18, wherein the coil component has a pin, the pin is pushed through an opening in the core, and the core, the electric conductor and the pin are arranged in the cup.

26. The coil component as claimed in claim 25, wherein the pin has a fixing device, which is designed to fix the coil component mechanically to a circuit board and/or to a heat sink.

27. The coil component as claimed in claim 18, further comprising: further electric conductors, which are wound around the core; and further electric terminal contacts, which are in electric contact with associated ends of the further electric conductors.

28. The coil component as claimed in claim 18, wherein the cover is formed as a circuit board, wherein conductor tracks which connect the electric terminal contacts electrically to the ends of the electric conductor are formed on the circuit board.

29. A coil component combination, comprising: a plurality of coil components as claimed in claim 18; and a single cup main body, wherein the cups of the respective coil components are formed in the cup main body or are formed by way of the cup main body.

30. The coil component combination as claimed in claim 29, wherein the cup main body is formed as a heat sink.

31. A method for manufacturing a coil component, comprising the steps of: winding an electric conductor around a soft magnetic core; inserting the electric conductor wound around the core and the core into a cup; filling the cup with potting compound; closing the cup with a cover; and providing ends of the electric conductor with electric terminal contacts.

32. The method as claimed in claim 31, wherein the filling of the cup with potting compound comprises the steps of: heating the electric conductor, the core and the cup to a first temperature; potting the cup with potting compound; heating the electric conductor, the core, the cup and the potting compound to a second temperature; maintaining the second temperature during a first time period; heating the electric conductor, the core, the cup and the potting compound to a third temperature; and maintaining the third temperature during a second time period.

33. The method as claimed in claim 31, wherein the filling of the cup with potting compound comprises the steps of: filling the cup with aluminum oxide powder; shaking the cup and/or tamping the aluminum oxide powder; and sealing a surface of the aluminum oxide powder with a sealing medium.

34. The method as claimed in claim 31, further comprising the step of: selecting a position of the electric terminal contacts depending on an installation situation of the coil component.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The invention will be described in more detail below with reference to the drawings, in which:

[0036] FIG. 1 shows an exploded illustration of a coil component according to the invention according to a first embodiment,

[0037] FIG. 2 shows an exploded illustration of a coil component according to the invention according to a further embodiment, and

[0038] FIG. 3 shows an exploded illustration of a coil component combination according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

[0039] FIG. 1 shows an exploded illustration of a coil component 1 according to a first embodiment.

[0040] The coil component 1 has a circularly cylindrical plastic cup, which is formed from a plastic base plate 10 and a plastic sleeve 20.

[0041] The coil component 1 has a ferromagnetic annular core 40, wherein an electric conductor 41 of the coil component is wound around the core 40.

[0042] The coil component 1 has two electric terminal contacts 60, which are connected electrically to ends of the electric conductor 41 via conductor tracks 51 of a circuit board 50. The ends of the electric conductor 41 are soldered to the circuit board 50 at suitable passage openings. In the state in which the coil component 1 is ready to operate, the circuit board 50 closes the cup 10, 20, i.e. the circuit board 50 simultaneously forms a cover for the cup 10, 20.

[0043] The coil component 1 further comprises a copper pin 30, which is pushed through an opening in the annular core 40.

[0044] The coil component 1 further comprises electrically insulating films 70, 80. The circularly cylindrical film 70 covers the base plate 10 of the cup, and rectangular film 80 is wound around the pin 30.

[0045] In the state in which the coil component 1 is ready to operate, the core 40, the electric conductor 41, the pin 30 and the films 70, 80 are arranged in the cup 10, 20, wherein the cup 10, 20 is filled with potting compound 15. The potting compound 15 contains polyurethane, thermally conductive filler and a hardener. Alternatively, the potting compound can contain aluminum oxide powder.

[0046] The pin 30 has fixing means, which are designed to fix the coil components 1 to a circuit board.

[0047] The coil component 1 can be used as a choke and has a defined inductance between its electric terminal contacts 60.

[0048] The coil component 1 can be manufactured as follows.

[0049] The electric conductor 41 is wound around the core 40, as illustrated in FIG. 1. The electrically insulating films 70, 80 are arranged suitably and the copper pin 30 is pushed through the opening in the core 40 and then screwed to the base plate 10. The base plate 10 and the sleeve 20 are then connected to each other, for example by the base plate 10 and the copper pin 30 fixed thereto and the core 40 and the winding 41 surrounding the core 40 being pushed into the sleeve 20 from below as a combination. The base plate 10 and the sleeve 20 can be connected to each other, for example, by means of a latching connection.

[0050] Tempering of the coil component 1 is then carried out. After the components have been heated to optimally 80° C., a mixture of polyurethane with thermally conductive filler with a hardener is potted into the cup 10, 20 filled as described above under vacuum. Curing is carried out by means of subsequent further tempering to 80° C. for 90 minutes and then 110° C. for 90 minutes.

[0051] Subsequently, the cup 10, 20 can be enclosed with the cover or the circuit board 50 and the ends of the electric conductor 41 can be brought into electric contact with the electric terminal contacts 60, by the ends of the electric conductor 41 being soldered to corresponding soldering points of the cover or the circuit board 50. These steps can also be carried out before the tempering.

[0052] FIG. 2 shows an exploded illustration of a coil component 1′ according to a further embodiment.

[0053] In this embodiment of the coil component 1′, in addition to the electric conductor 41, here designated as 41_1, two further electric conductors 41_2 and 41_3, which are likewise wound around the core 40, are provided. Accordingly, further electric terminal contacts 60 are provided, which are in electric contact with associated ends of the further electric conductors 41_2, 41_3 by means of the circuit board or the cover 50.

[0054] The electrically insulating films 70, 80 from FIG. 1 are not shown in the embodiment from FIG. 2 but can also be present in this embodiment.

[0055] An electric equivalent circuit diagram of the coil component is illustrated at the bottom.

[0056] Otherwise, reference should be made to the explanations relating to FIG. 1, in order to avoid repetitions.

[0057] FIG. 3 shows an exploded illustration of a coil component combination 2.

[0058] The coil component combination 2 has three coil components 1, as already illustrated in principle in FIG. 1.

[0059] The coil component combination 2 has a single cup main body formed from a single cup main body base plate 11 and an individual cup main body sleeve 21, wherein the cups of the respective coil components 1 are formed by the cup main body 11, 21. To this end, the cup main body base plate 11 and the cup main body sleeve 21 have appropriate circularly cylindrical cavities, which are used to receive the respective components 40, 41, 70, 80.

[0060] Connecting pins 12 are used to pin the cup main body base plate 11 to the cup main body sleeve 21.

[0061] The coil component combination 2 reduces the manufacturing and material costs if a plurality of coil components is needed.