EP1371071A1

EP1371071A1 - Inductive component with wire-guiding slots

Info

Publication number: EP1371071A1
Application number: EP02722013A
Authority: EP
Inventors: Eva Steiner
Original assignee: Epcos AG
Current assignee: TDK Electronics AG
Priority date: 2001-03-23
Filing date: 2002-03-20
Publication date: 2003-12-17
Also published as: WO2002078016A1; US6781499B2; DE10114182A1; CN1460271A; DE10114182C2; US20040119575A1

Abstract

An inductive component with a coil body (10) is disclosed, comprising a winding chamber, defined by external flanges (12) and a winding tube (11), a contact strip (13) with contact elements (14), formed on one of the external flanges (12) and a wire guiding slot (15, 18; 17,20), running in a first region in the underside of the contact strip (13), transverse to the longitudinal direction thereof and extending into a second region to the winding chamber with varying depth in the outer flange opening on the winding chamber side oriented towards the winding tube (11).

Description

description

Inductive component with wire guide slots

The invention relates to an inductive component with a coil former, which has a winding space delimited by outer flanges and a winding tube, contact strips formed on the outer flanges with contact elements and wire feed-through slots which run in the contact strips.

Such a coil is essentially known from European Patent EP 0 594 031. These inductive components, primarily as coils or transformers, also with subdivided winding rooms, must meet high requirements with regard to overvoltage resistance and tracking resistance. When mounting on printed circuit boards in connection with other electronic components, voltages of 200 V and above can occur between the turns. It is therefore necessary to wind the bobbin so that the bending and bending stress on the winding wire is as low as possible and the

Winding itself is as even as possible. A uniform winding structure may also be necessary from the electrical specifications for the inductance. Appropriate standards must be observed for the respective specific applications of such coils or transformers, for example EN60950 for telecommunication applications, which in particular also requires tracking resistance.

The winding ends that have to be connected to the contact elements can be guided in the contact strips in wire guide slots. In practice, the first and each additional winding is often attached to the inner flange side with a barrier tape and separated from the adjacent winding in order to ensure creep resistance between the core and the first winding and between the windings among themselves , However, it cannot be avoided that in the manufacture of the inductive component, a pull is exerted on the first winding or the inner windings as soon as the second winding and the next winding are applied.

The invention is therefore based on the object of specifying an inductive component of the type mentioned at the outset with improved properties.

The invention achieves this object with the features of patent claim 1. Embodiments of the invention are characterized in subclaims.

The invention has the advantage that the wire of the first winding in the section leading away from the winding tube to the contact elements or the winding pins of the contact elements has little or no frictional contact with the second or higher winding and therefore a lower tensile load arises on the winding wire. The same applies to the next higher windings, i.e. for the second winding when applying the third, etc., if more than two windings are provided. The greatest advantage, however, arises with the first, innermost winding, because this is the largest distance from the contact strip.

Another advantage is that the process reliability during winding is increased during the manufacture of the component.

Advantageously, the barrier tape can be easily and securely attached to the side of the inside of an outer flange, because the winding wire runs largely in the wire guide slot in this area and at most lies only slightly on the inside of the outer flange.

Another advantage of the invention is that due to the course of the end region of the winding wire in the wire guide slots, the homogeneity of the layer structure of the Windings, especially at higher winding layers is significantly improved. This makes it possible to design the inductive component as a surface-mountable component and to automate the pick-and-place process thanks to the homogeneous winding structure. At the same time, the winding process of the inductive component can be controlled reliably.

An advantage of the invention is that the low voltage and tensile stress of the winding wire in the connection areas and the guidance of the wire in the wire guide slots improve the surge resistance and the tracking resistance of the component.

The invention is explained in more detail below with reference to four figures of the drawing, in which the same elements are provided with the same reference numerals. Show it

Figure 1 schematically shows a perspective view of a bobbin according to the invention, Figure 2 shows a section through the bobbin perpendicular to

3 shows a further schematic perspective view of the coil former according to the invention, FIG. 4 shows schematic cross sections of different forms of wire guide slots and

5 shows a schematic section through an end region of the component.

A surface mountable inductive component is shown in the exemplary embodiment in FIG. According to FIG. 1, in which elements of the component are provided with reference numerals only on one side of the winding tube with respect to the symmetry and to improve clarity, a perspective view of the component is seen from below, ie the view of the later on Printed circuit board bottom to be shown. The inductive component ment is in particular a coil or a transformer and can also have subdivisions of the winding space.

The coil former 10 has a winding space which is not further divided in the exemplary embodiment. The winding space is defined by a winding tube 11, which in the exemplary embodiment is approximately ellipsoidal in cross section, but can also have a different cross-sectional shape, for example circular. The winding space or the winding tube is delimited laterally by outer flanges 12a, 12b. Contact strips 13a, 13b are integrally formed on the outer flanges 12a, 12b. The contact strips each include contact elements, which are pin-shaped in the embodiment and on the one hand via Anwickelpins 14 ^λ a to 14 h connected to the ends of the windings and the other, on PCB Pins 14a to 14h with corresponding contact surfaces, for example on a printed circuit board connectable.

It goes without saying that the contact strips can also have other forms of the connection elements, as are known per se for surface-mountable components. The geometry of the electrical connection elements of the coil body is largely independent of the design of the wire guide slots.

The parts of the contact elements which protrude on the underside of the contact strips, the circuit board pins, are shaped in such a way that the connection contact areas of the contact elements are bent and flattened. The flattened undersides of the PCB pins are coplanar in one plane, so that the component can easily be placed on a printed circuit board and soldered. In the exemplary embodiment, these regions run in a plane that runs parallel to the axis A (see FIG. 2) of the winding tube.

To make it easier to contact the winding, the contact elements within the contact strips are leads that a second part of the respective contact element, the winding pin, protrudes laterally from the coil body. These ends of the contact elements provided for the winding contact also run essentially in one plane parallel to the axis of the winding tube. This design of the contact elements also offers the possibility of gaining access to the winding connections, even if the component is soldered to a printed circuit board. However, the component can also be designed with push-through contact elements or other geometries of the contact elements.

On each side of the winding space, several wire guide slots run between the contact elements, in the exemplary embodiment the wire guide slots 15, 16 and 17 between the contact elements 14a to 14d - or corresponding wire guide slots on the other side of the winding space - which are located on the underside of the contact strips transversely to the longitudinal axis the contact strips of the coil body extend.

The wire guide slots which initially run in the contact strips essentially parallel to the axis A of the winding tube then bend in the direction of the winding space and the winding tube. “In the direction” means that the depth of the respective wire feed-through slot towards the winding tube decreases and finally becomes zero on the inside of the outer flange. In the exemplary embodiment, the turning point is so far from the inner edge of the contact strips or the inside of the outer flange that a bevel Area arises which can completely accommodate the winding wire guided therein, at least in a partial area, without the wire having to be bent excessively at the bending point of the wire guide slot.

Instead of a comparatively strong bend as in FIG. 1, which is schematically illustrated again in FIG. 4a as a section through a contact strip, other geometries of the course of the wire guide slots on the Be provided on the inside of the side facing the outer flanges. The cross section of the wire guide slot in FIG. 4 b is continuously curved or arched, while FIG. 4 c shows a continuous slant of the cross section with respect to the axis of the winding tube 11. In FIG. 4c, the outer flange 12 is reinforced in the area of the transition to the contact strip 13 at the level of the wire guide slot, reference number 24. The geometries are designed in such a way that there are no sharp edges that could damage the insulation of the wire winding to be applied.

In Figure 1, the beveled portion 18 and 20 of the respective wire guide slots - or corresponding areas on the other side of the winding space -, as can be seen in Figure 2 or Figure 4, close to the winding tube 11 on the inside of the respective outer flange, while the corresponding Section 19 of the central wire guide slot still opens in the area of the contact strip in the winding room, see Figure 2. This means that, in the exemplary embodiment, a rectangular cross section of the wire guide slot has been selected, the wire guide slots in the outer region of the coil former open with a corner at or immediately next to the winding tube, for example less than a slot width away from the latter. Other cross sections and courses of the wire guide slots are possible, for example a trapezoidal or oval cross section. The outer wire guide slots 15, 17 also need not be arranged symmetrically to the wire guide slot 16. The centrally arranged wire guide slot 16 opens essentially with its entire cross-sectional width at the winding tube. This also means that the outer wire guide slots can at most connect tangentially to the winding tube, or that their course is advantageously oriented towards the winding tube. If necessary, the longitudinal direction of the areas 18 and 20 cannot point parallel, but at an angle and, in extreme cases, directly in the direction of the axis A of the winding tube. ω 2! JH 2! P- α CQ μ- ö α. ω Hl ⁾ 3 CQ et P. tr Hi * ή tr tr Ei t- P. PO 1— ^■ P α p P> H- C H- μ- CD CD rt Ei 3 C CD μ- = C PJ = Ω Φ Φ Φ μ- J φ μ- μ- φ P Φ φ J μ-

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Claims

claims

1.Inductive component with a coil former (10), which has: - a winding space delimited by outer flanges (12) and a winding tube (11), a contact strip (13) with contact elements (14) formed on one of the outer flanges (12), one Wire guide slot (15, 18; 17, 20), which extends in a first area on the underside of the contact strip (13) transversely to its longitudinal direction and in a second area extends to the winding space with variable depth in the outer flange and to the winding tube ( 11) opens on the winding room side.

2. Component according to claim 1, characterized in that the wire guide slot (15, 18; 17, 20) in the first region is partially parallel (15; 17) or at an acute angle to the axis (A) of the winding tube (11 ) runs.

3. Component according to claim 1 or 2, so that the wire guide slot (15, 18; 17, 20) in the second area (18; 20) is bent in relation to its course in the first area in the direction of the winding space.

4. Component according to claim 1 or 2, so that the wire guide slot (15, 18; 17, 20) encloses approximately the same angle to the axis (A) of the winding tube (11) in the first and the second region.

5. Component according to one of the preceding claims, characterized in that a plurality of wire guide slots (15, 18; 17, 20) are provided, the planes spanned by them running parallel.

6. The component according to claim 5, d a d a r c h g e k e n n z e i c hn e t that the axis (A) of the winding tube (11) parallel to the through

Wire guide slots (15, 18; 17.20) spanned levels.

7. Component according to one of claims 1 to 4, that a plurality of wire guide slots (15, 18; 17, 20) are provided, each of which extends at a different angle in the second region to the winding space.

8. The component according to one of the preceding claims, that the wire guide slot has a rectangular or trapezoidal or oval slot cross section.

9. The component according to one of the preceding claims, that the wire guide slot is arranged between two contact elements.

10. Component according to one of the preceding claims, that the contact strip has undercuts (21) at its end regions.

11. The component according to one of the preceding claims, characterized in that the contact elements run parallel to the mounting plane of the component.

12. Component according to one of the preceding claims, since you rchgek characterized in that the contact elements are shaped so that a circuit board-side connection area (14a to 14h) on the underside of the component and a winding area (14 ^λ a to 14 ^λ h) from the side protrude from the component.

13. Component according to one of the preceding claims, that the outer flanges have at least partially reinforcements (23, 24) in the outer transition region to the contact strips.

14. Use of an inductive component according to one of the preceding claims for surface mounting on a circuit board.