DE3039163A1 - Variable inductance coil for telephone network - has fragments and sections to form network having at least one separate loop - Google Patents

Abstract

The hybrid coil with variable inductance is designed for frequency filters for subscriber speech signals of a PCM telephone communication system, and provides the advantage of coil adjustment for altering the inductance in small steps when the magnetic core is not moved or otherwise changed. One or more of the fragments (F) and/or one or more sections (A,AN) form a network (N) of conductors, having at least one separate loop, at least during a operating phase or a mfy. phase following location of the current conducting connections (v). Adjustment of the hybrid coil is carried out by means of a laser beam in order to separate one or more of the loops (T) according to the inductance measured.

Description

SIEKiENS AKTIENGESELLSCHAFT Our mark Berlin and Munich VPA

80 P 6 1 8 S DE

A hybrid coil with changeable * inductance and a method for adjusting it. ; _r ___

The invention relates to an electromagnetic component, namely a special coil, which is used in particular for frequency fliter for subscriber speech signals of a PCM telephone exchange system was developed. The invention is also ideal for coils communications engineering, especially when these arrangements are mass-produced in large numbers should be and / or especially if these arrangements are to be flat and insensitive to shock.

As indicated in the preamble of claim 1 is, the invention is based on a hybrid coil having a variable inductance

- substrate,

- attached to the substrate, e.g. printed and baked, Tracks that

- at least to a large extent in each case between with the concerned Conductor tracks conductively connected contact patches, i.e. between a first and a second contact pads, lie and - each represent fragments of turns, - magnetic core thus attached to these fragments and isolated from the fragments by a first insulating layer, that

- its existing magnetic field lines in operation, at least partially, in one plane run parallel to the substrate surface and along one side of the magnetic core the first Contact pads and along the opposite side of the magnetic core are the second contact pads,

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- Sections of conductor tracks isolated from the magnetic core by a second insulating layer, which form the rest of the Forming turns, and

- Conductive connections between first ends

these sections with respectively associated first contact pads and between the other second ends these sections with respectively associated second contact pads.

A special variant of such a hybrid coil is not previously published in the older one

- DE-OS 30 36 704

described. A large number of variants of hybrid coils of the same type, but without any indication of adjustability, is in the other older, not-pre-published

- DE-OS 30 16 067 and

- DE-OS 30 35 861
described.

The older hybrid coil according to DE-OS 30 36 704 already has the advantages also given in the invention that

- the windings no longer have to be wound up, often placed very carefully by hand, but rather time-saving, at least largely, can be attached by machine with particularly little effort,

- the high tolerances for the thickness or flatness of the, e.g. hand-wound windings can be avoided by ensuring a high degree of uniformity of the windings is secured,

- Avoided the high weight of magnetic coils, which are connected to the substrate by only a few wires is in that the magnetic core is attached to the substrate from a plurality of sections, whereby the Hybrid circuit is less sensitive to shock and therefore even, often without subsequent complete encapsulation with plastic

ORlGiNAL INSPECTED

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substance can also be used in systems exposed to high accelerations,

- the magnetic core, even before the sections are joined with the fragments, if necessary, are glued to the substrate or to its fragments can, without complicating the connection of the winding to the other conductor tracks of the substrate - what the Impact insensitivity and spatial tolerance accuracy further increased, ^

- the often high difficulties in positioning and individually soldering individual wires for connecting with contact pads attached to the substrate are largely eliminated, although now a much higher number Such connections are to be established, - the tolerances of the distances between the sections are observed it can be ensured that short circuits between these sections are reliably avoided,

. "~ anyway the length of the individual sections if necessary can be chosen almost as large as desired, so that e.g. thick magnetic cores can be used without further ado, which means that correspondingly high inductances can be achieved instead of the maximum length of approx. 3 mm that is required for bonded Single wires are permitted (see US 4103 267),

- instead of having to connect the sections one after the other, all sections, at least each at one end, in a single operation, preferably by machine, at the same time with largely uniformly high quality can be connected to the assigned contact surfaces, which in particular saves a considerable amount of time and money, - also cheaper material, e.g. copper masses, for the sections instead of the preferably made of gold Single wires (see e.g. Electronics, July 20, 1928, figure on page 107) can be used,

- Sufficient operational safety even with more

or the electrical conductivity of the magnetic material is less than good,

- The tearing off of the individual wires when they are placed on the

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Magnetic core and during bonding and thus a corresponding amount of scrap can be avoided,

- because of the replacement of the bonding of individual wires, which generally requires gold, also other, often more reliable, Connection types, e.g. so-called flow soldering with tin, which is why the invention no longer necessarily requires ceramics as a substrate; In the present invention, for example, an oxide resin or hard paper is also acceptable as a substrate; - Without major difficulties in terms of spatial tolerances and in terms of mutual isolation and positioning, if necessary even several layers of turns, even with very small distances of the sections from each other, can be attached and thus quickly and easily achieved high inductances can be

- it requires very little space and, above all,

- a subsequent adjustment of the inductance the hybrid coil becomes possible so that

- it also allows the use of the hybrid coil for frequency filters;

so that overall because of these advantages in the result

- the cost of making the assembly compared to the hybrid circuits with massive wound Magnet coils significantly lowered and

- Nevertheless, the small size, operational reliability and adjustability of the hybrid coil while maintaining narrow spatial conditions Tolerances are improved.

The invention also has the additional advantage that

- The adjustment of the hybrid coil, that is, the need-based change in its inductance, carried out in small steps can be changed even if the magnetic core is not shifted or BQnat as changed.

ORIGINAL INSPECTED

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This additional advantage is achieved, see the characterizing part of claim 1, in that - one or more of the fragments and / or one or more of the sections, in - at least during one Operating phase and / or manufacturing phase after making the 'conductive connections - accessible way, each forms a network of lines having at least one single loop. Allow the measures specified in the subclaims moreover, similar additional benefits; namely allow the measures according to claim '.

2, the inductance can be changed relatively easily by moving the magnetic core, and

3, the inductance of many, produced in larger series ^ 5 hybrid coils provided, even if required, to a large extent automatically, to change.

The invention and its developments are based on the In the figures schematically shown embodiment further explained, wherein FIG

1 is a plan view of an embodiment, as well as -

FIG. 2 shows an enlarged section containing the network from the exemplary embodiment shown in FIG

demonstrate.

The substrate Su of the hybrid coil can be seen in both figures. On the substrate Su there are in each case the e.g. printed and burned-in fragments F of conductor paths attached, at least largely between each, with the respective conductor tracks F conductively connected, contact pads KF, that is, between each one first and a second contact patch KF, and the respective fragments F of turns of the hybrid coil represent.

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On these fragments F is in each case the preferably flat one of the fragments through a first insulating layer Isi . isolated Magnetkern'MK attached, in such a way that its magnetisehen in the magnetic core MK during operation Field lines, at least partially, run in a plane parallel to the substrate surface Su and that along one side of the magnetic core MK the first contact pads KF and along the opposite side of the Magnet core MK are the second contact pads KF.

The sections A of conductor tracks isolated from the magnetic core MK by the second insulating layer Is2 each form the rest of the turns of the hybrid coil, with part of the upper components of the exemplary embodiment in FIG. 1 / left to clarify the structure of the same has been omitted. There are conductive connections V, respectively between first ends of these sections A with respectively associated first contact pads KF and between the others second ends of these sections A attached to each associated second contact pads KF.

The second insulating layer Is2 can be achieved, for example, by imprinting an insulating varnish, with the sections A themselves also being able to be produced, for example, using thick film technology on a carrier, which in itself is not published in the older version
- DE-OS 30 16 067

is described. Instead of this, however, the second insulating layer Is2 can also be identical to the carrier to which the sections A are attached e.g. in thick film technology, with free-standing ends of these sections A over the carrier Is2 protrude, see in particular cias embodiment in Fig. 1 and 3, and these ends of the sections A at V with the contact pads KF conductive are connected. This variant of the production of the second insulating layer Is2 and the sections A is in itself

ORIGINAL INSPECTED

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in the older, not previously published - DE-OS 30 35 861

described.

To enable the subsequent change of the inductance According to the invention, the hybrid coil is one, in the exemplary embodiment shown four meshes or loops having, network N of lines attached to the last, rightmost section AN of the hybrid coil, so that the coil current I flowing through this section AN, see FIG. 2, is initially per se across all these loops or meshes of the network N divides. The network N preferably contains many more than just four such Loops or stitches, for the sake of clarity, only four are shown here. This network N is perpendicular attached to the substrate surface Su so that it is after its attachment, at least during the phase of Adjustment of the hybrid coil, is easily accessible by cutting through mesh sections, e.g. at the Points T indicated by boxes, to determine the final spatial shape of the coil currents I, see FIG and in this way to determine the final strength of the inductance of this hybrid coil. Depending on, which mesh sections are cut and which are not cut, the inductance according to Demand changed more or less strongly, with the coil currents finally flowing in mesh sections I. correspond to a series coil connected in series with the rest of the hybrid coil, whose series inductance correspond to magnetic field lines, which are usually considerably strong components perpendicular to the substrate surface Exhibit su. The rest of the hybrid coil shows, at least inside their magnetic core MK, particularly strong components of magnetic field lines that run parallel run to the substrate surface Su.

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These magnetic field lines running perpendicular to the substrate surface Su in the area of the network N correspond that is, relatively weak series inductances, the strength of which is subsequently made by means of severing T as required is selectable or changeable. Especially if the magnetic core MK is thin in the area of the network N, in Direction perpendicular to the substrate surface Su, is the inductance of the entire hybrid coil in very small Levels can be changed - especially if the network area N, or respectively, covered by the magnetic core MK. the Magnetic core area MK, covered by the network area N, is small compared to the total area of the network N, such as in Figs. 1 and 2.

An additional measure for changing the inductance, i.e. for adjusting the hybrid coil, is achieved in that the magnetic resistance of the magnetic core MK, at least during an operating phase in the Manufacture and / or use of the hybrid coil, according to the teaching of DE-OS 30 36 704 makes changeable, e.g. by Moving the magnetic core MK and / or by changing the shape of the magnetic core MK and / or by changing the Stray field of the hybrid coil in particular by means of an additional magnet body attached externally and displaceably MKz, which can for example consist of iron or ferrite ceramic and the like.

Accordingly, e.g., cf. Fig. 2, to enable the adjustment, the magnetic core MK initially at different depths into the one formed between the insulating layers Isi - Is2 Pocket. This plugging and the change in the magnetic resistance are particularly successful easily when the magnetic core MK, viewed perpendicular to the substrate surface Su, in the area of the fragments F and the section A has a non-parallel outline, in particular a wedge-shaped outline, cf. the wedge-shaped outline in Fig. .1. This different

ORIGINAL INSPECTED

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Deep plugging changes the magnetic resistance and thus the inductance. This adjusts the Hybrid coil is preferred so that its inductance is now only slightly weaker than finally desired. Subsequently, mesh sections are cut through until the final desired inductance of the entire hybrid coil is reached.

Regardless of whether a magnetic core MK is used with a changeable or unchangeable magnetic resistance is, the inductance of the hybrid coil can be changed by, for example, using a laser beam, by measuring the respective inductance, one or more of the loops, see. in Fig. 2, are separated, which defines the final spatial position of the coil currents, see I, and thus the final inductance the hybrid coil can be set.

3 claims
2 figures

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Claims (3)

80 P 6 1 8 9 DE patent claims. y. A variable inductance having hybrid coil with
- substrate, - Conductor tracks attached to the substrate, e.g. printed and burned-in, which - at least to a large extent in each case between with the concerned Conductor tracks conductively connected contact patches, that is, between a first and a respective one second contact patch, lie and each represent fragments of turns, - so attached to these fragments, by a first '' Insulating layer of the magnetic core isolated from the fragments, '"15 that" "" "· ... its existing magnetic field lines in operation, in any case partially, in a plane parallel to the substrate surface and the first contact pads along one side of the magnetic core and along the opposite side of the magnetic core are the second contact pads, - Sections of conductor tracks isolated from the magnetic core by a second insulating layer, which form the rest of the Forming turns, and - Conductive connections in each case between first ends of these sections with respectively assigned first contact pads and between the other second ends of these sections with respectively associated second contact pads, in particular used as a hybrid filter coil in a subscriber speech signal frequency filter of a PCM telephone switching system, characterized in that - one or more of the fragments (F) and / or one ORIGINAL INSPECTED υ ό a - <6 VPA 80 P 6 1 3 3 QE or several sections (A, AN), in - at least during an operating phase and / or manufacturing phase after the conductive connections (V) have been made in an accessible manner, at least one in each case Forms loop having network (N) of lines. 2. hydride coil according to claim 1, characterized in that - The magnetic resistance of the magnetic core (MK), at least during an operating phase in manufacture and / or application of the hybrid coil is changeable. 3. A method for adjusting the hybrid coil according to claim 1 or 2, characterized in that - by means of a laser beam, measuring the respective Inductance, one or more of the loops (at T) can be severed. ORIGINAL INSPECTED