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CN-114342013-B - Device with winding carrier and core and method for producing a device

CN114342013BCN 114342013 BCN114342013 BCN 114342013BCN-114342013-B

Abstract

An arrangement (1) comprises a winding carrier (2), at least one winding (3), a magnetic core (7) and a first and a second terminal (5, 6). The winding carrier (2) encloses the core (7) at least in regions such that the insulating path (29) between the terminals (5, 6) does not comprise a bridge through the core (7) along the underside (14) of the device (1). In particular, the underside (14) of the winding carrier (2) is in a closed form.

Inventors

  • 5. Malinowski
  • M. Hobner

Assignees

  • TDK电子股份有限公司

Dates

Publication Date
20260512
Application Date
20210311
Priority Date
20200313

Claims (11)

  1. 1. An arrangement with a winding carrier (2) and a magnetic core (7), the arrangement further comprising: At least one winding (3) of a wire (4) arranged around the winding carrier (2), At least one first electrical terminal (5) and at least one second electrical terminal (6), wherein the winding carrier (2) encloses the magnetic core (7) at least in a plurality of regions, such that an insulating path (29) between the first electrical terminal (5) and the second electrical terminal (6) along the underside (14) of the device (1) does not comprise a bridge through the magnetic core (7), Wherein the magnetic core (7) comprises a first core part (8) and a second core part (9), Wherein the winding carrier (2) comprises a lead-in piece (19), in which lead-in piece (19) the magnetic core (7) is arranged, wherein the winding carrier (2) comprises a first opening (17) at a side face (16, 24) for inserting a first core part (8) and a second opening (18) at an upper side (15) for inserting a second core part (9), wherein the lead-in piece (19) is accessible from the outside only through the first opening (17) and the second opening (18).
  2. 2. The device according to claim 1, Wherein the magnetic core (7) is surrounded by the winding carrier (2) such that the sum of the insulation path (12) between the first electrical terminal (5) and the magnetic core (7) and the insulation path (13) between the second electrical terminal (6) and the magnetic core (7) is at least as large as the geometrical distance (d) between the first electrical terminal (5) and the second electrical terminal (6).
  3. 3. The device according to any one of claims 1 and 2, which is designed as a transformer, wherein the first electrical terminal (5) is located on a primary side and the second electrical terminal (6) is located on a secondary side.
  4. 4. The device according to any one of claims 1 and 2, wherein the underside (14) of the winding carrier (2) does not comprise a cutout through which the magnetic core (7) is exposed.
  5. 5. The device of any one of claims 1 and 2, wherein one of the core members is I-shaped and the other of the core members is U-shaped.
  6. 6. The device according to any one of claims 1 and 2, wherein the first electrical terminal (5) is arranged at a first side (16) of the winding carrier (2) and the second electrical terminal (6) is arranged at a second side (24) of the winding carrier (2), wherein the magnetic core (7) is surrounded by the winding carrier (2) completely or in a main part at least at one of these sides (16, 24).
  7. 7. The device according to any one of claims 1 and 2, wherein at least one of the first electrical terminal (5) and the second electrical terminal (6) is arranged to retract in a lateral direction.
  8. 8. The device according to any one of claims 1 and 2, wherein the winding carrier (2) comprises at least one opening (17) for inserting the magnetic core (7) on a side (16) on which at least one of the first electrical terminal (5) and the second electrical terminal (6) is arranged.
  9. 9. A method for manufacturing the device of any one of claims 1 to 8, comprising the steps of: A) Providing the winding carrier (2) and providing a first core part (8) and a second core part (9), B) Inserting the first core element (8) into the first opening (17), C) -inserting the second core element (9) into the second opening (18).
  10. 10. An arrangement with a winding carrier (2) and a magnetic core (7), the arrangement further comprising: At least one winding (3) of a wire (4) arranged around the winding carrier (2), At least one first electrical terminal (5) and at least one second electrical terminal (6), wherein the winding carrier (2) comprises an underside (14), wherein the first electrical terminal (5) and the second electrical terminal (6) are arranged opposite each other with respect to the underside (14), wherein the winding carrier (2) does not comprise a cutout through which the magnetic core (7) is exposed at least in an area of the underside (14) laterally delimited by the first electrical terminal (5) and the second electrical terminal (6), Wherein the magnetic core (7) comprises a first core part (8) and a second core part (9), Wherein the winding carrier (2) comprises a lead-in piece (19), in which lead-in piece (19) the magnetic core (7) is arranged, wherein the winding carrier (2) comprises a first opening (17) at a side face (16, 24) for inserting a first core part (8) and a second opening (18) at an upper side (15) for inserting a second core part (9), wherein the lead-in piece (19) is accessible from the outside only through the first opening (17) and the second opening (18).
  11. 11. The apparatus according to any one of claim 1 and 10, Wherein the magnetic core (7) is completely or in a main part surrounded by the winding carrier (2) at one of the sides (16, 24).

Description

Device with winding carrier and core and method for producing a device Technical Field The invention relates to a device comprising a winding carrier with windings and a magnetic core. For example, it is a transformer. It may also be another device with a magnetic core. Background In the case of electrical devices such as, for example, transformers, the defined insulation distance between the electrical terminals must be complied with, in particular in accordance with the IEC standard. Wherein the insulation distance, i.e. the shortest possible creepage distance and/or clearance distance between the terminals along the insulation material, should be sufficiently large. For example, an insulation distance between the terminal on the power supply side and the terminal on the user side must be observed. The insulating paths may be bridged by conductive magnetic cores so that the distance between the terminals must be correspondingly lengthened. For example, at operational heights above 4 km a above sea level, long gap distances are required. In order to ensure a sufficient insulation path, the distance from the electrical terminal to the core is generally selected to be suitably large. This leads to an undesirable increase in the size of the device, in particular because the core size and the insulation paths to be followed add up. In order to prevent the insulating paths from being bridged, the core itself may also be enclosed in a plastic housing and mounted in an insulating manner in the device. It is also known to cast components such as wound annular cores as a whole so that only the terminals exit from the casting. However, this has drawbacks in terms of cost and component size. It is also known from document US 9,646,755B2 to insert a coil together with a core into a housing that is open on one side in order to insulate the core from the terminal pins and in this way to increase the gap distance. The wire ends are then led from the windings to the pins via the outside of the housing. Disclosure of Invention It is an object of the present invention to provide an improved device and a method for manufacturing a device. According to a first aspect of the invention, an apparatus comprises a winding carrier and at least one winding arranged around the winding carrier. The windings may be windings of, for example, wires such as round or flat wires, or may also be printed windings. The winding carrier is composed in particular of an electrically insulating material. For example, it is a plastic material. The winding carrier is used in particular for positioning the windings. In particular, the windings are wound directly on the region of the winding carrier. The winding carrier has, for example, a one-piece design. In particular, the winding carrier can be produced by injection molding. Furthermore, the device comprises a magnetic core. For example, the core comprises ferrite material. In particular, the core surrounds the area of the winding. For example, the core forms a closed magnetic circuit. The core may comprise a plurality of core portions. For example, the core includes an I-shaped core member and a U-shaped core member. Other core shapes are also possible. For example, the core parts are glued to each other. The device comprises at least one first electrical terminal and at least one second electrical terminal. The device is configured, for example, as a transformer. The first electrical terminal is formed, for example, on the primary side and the second terminal is formed on the secondary side. The first terminal may in particular be a terminal on the power supply side, while the second terminal may be a terminal on the user side. The device may have a plurality of first terminals and a plurality of second terminals. The terminals are for example in the form of pins. For example, the first terminals are arranged side by side in a first row and the second terminals are arranged side by side in a second row. The first terminals are electrically connected in pairs with one or more first windings, for example, and the second terminals are electrically connected in pairs with one or more second windings. The terminals are arranged, for example, in the lower region on the winding carrier. The first and second terminals are for example arranged at opposite edges of the winding carrier. The terminals may be directly attached to the winding carrier. For example, the terminals are co-injection molded in an injection molding process. The winding carrier is designed as at least part of the insulation of the core. Therefore, no additional insulation of the core is required. In particular, no separate casting or separate housing is required for the core. In particular, the winding carrier at least partially encloses the core such that the insulating path between the terminals along the underside of the device does not include bridging through the core. The insulation path is here the shortest gap and/or creepage