DE1462251A1 - Winding structure of a small transformer with a defined degree of coupling and defined internal capacities for transistorized line amplifiers of the carrier frequency technology - Google Patents

Description

TSLBFUNK EN 10.5.1968

Pafcentverwertungsgesellschaft m.b.H. 97 / 6sZbK

Winding structure of a small transformer with a defined degree of coupling and defined internal capacities for transistorized line amplifiers based on carrier frequency technology

The invention relates to a winding structure of a small transformer with a defined degree of coupling and defined intrinsic capacitances for transistorized line amplifiers of the carrier frequency technology.In these amplifiers, which are known to have a strong negative feedback for reasons of linearity, the leakage inductance and the intrinsic capacitances of the transformers, whose inductance and number of turns are usually only small, play a major role for the stability of the amplifier. It is therefore required of the transformers that during their mass production, reproducible, precisely specified values of the degree of coupling and of the intrinsic capacitance can be achieved in a simple manner.

The degree of coupling of a transformer with primary and secondary winding is the ratio of the useful flux that passes through the secondary winding to the total flux that arises in the energized primary winding. Since <the total flux is greater than the useful flux, there is a leakage flux that does not penetrate the secondary winding. The leakage inductance is used as a measure of the size of the leakage flux.

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6ADORKSTNAt

n (Art.7i1Abs.2Nr.18eü3dwÄnderunfltg ^ .v.4, i.lfifIl

The leakage inductance is with a transformer with a cylindrical Bobbin approximate

^{1st h} wl * ^h + £

_{2 2 0} E ₂ £

Vf

where Wg is the secondary number of turns, \ Iq is a constant, 1 is the mean winding length and b is the mean winding width of both windings in the axial direction, h_ is the distance between the windings

lungs, h _{wl is} the primary and h _{2 is} the secondary winding height in the direction perpendicular to the axis.

_{Since the winding heights h, and h w2 are} also small in a transformer with a small number of turns, ÖL is almost proportional to the distance h_ between the windings, ie every change in h "is also possible with ζ ζ

6l a. This should only be mentioned because it is most difficult to precisely maintain the spacing h "between the windings.

For the exact adherence to the leakage inductance, as far as it depends on the geometric dimensions, all are above named sizes are more or less important.

The internal capacities of the transformer consist of the winding capacity, the layer capacity and the winding capacity. The winding capacity is determined by the capacities between the individual Turns given. The layer capacity consists of the capacity between the layers. The winding capacitance is determined by the distance between the windings.

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The invention is based on the object of a simple wick. lungsaufb.au to find the defined values of the degree of coupling and the in-house capacities are guaranteed with particularly low layer capacity.

It is known (DBOM 1,810,551) for a broadband transmitter for electrical sewage transmission and measurement technology To achieve a defined degree of coupling that the coil body consists of two or more concentrically nested insulating sleeves to accommodate the individual windings. Since these sleeves have to fit exactly into one another, they are expensive to manufacture. In addition, with a larger number of turns, the Pail occur that the sleeve length is not sufficient to accommodate the turns in one layer next to each other and therefore two or several layers are required for one winding. Then a large and undefined layer capacity and a Undefined leakage inductance.

It is also well known, the total capacity, in particular the layer and winding capacity of telecommunications transformers by distributing the windings over several Transverse walls of the cylindrical bobbin formed, each receiving a part of the primary winding and the secondary winding To shrink chambers. Here, however, there is still a larger number of in each chamber in the direction of the longitudinal axis of the Coil body of adjacent turns is present, which is practically inadequate, especially with thin wires

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layer-by-layer winding technology to be carried out cleanly and because of the often considerable fluctuations in the fill factor as a result of different winding tension do not occupy a defined position. With this known multi-chamber winding, particularly in the case of mass production of transformers, there is no sufficiently constant winding Accuracy of the degree of coupling and the leakage inductance guaranteed *

This is achieved according to the invention in that the individual Windings of the transformer windings in annular groove-shaped transverse grooves of the bobbin, the width of which is equal to the diameter of the insulated winding wire.

The transition of the winding wire from one groove to the other and that The wire ends are expediently fixed in longitudinal · grooves the bobbin.

In the winding structure according to the invention, the individual according to a certain, empirically or computationally determined, the desired values of the coupling factor and the proper capacities or the leakage inductance into the transverse grooves inserted winding wires immovable at defined distances from one another. The already small layer capacity can if necessary through between the windings introduced intermediate turns of insulating material, in particular plastic fiber, serving as spacers, further reduced in size will.

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In FIGS. 1 to 4, exemplary embodiments of the inventive Winding structure of a small transformer in about 5-faoh enlarged Massafcab shown. Show it

Fig. 1 is a front view of a wound according to a first Wiokel scheme Bobbin,

Fig. 2 partially cut in the plane I - II of Fig. 1 » Side view of the bobbin and the

3 and 4 of FIG. 2, corresponding side views of the bobbin but with a different Vicke Isohema applied Windings ·.

1 is a cylindrical bobbin made of plastic »the one in its axial longitudinal hole 2 a cylindrical magnetic core, not shown, for example, the central lug of a ferrite tail core 3 are annular groove-shaped transverse grooves, the width of which corresponds to the outer diameter of the insulated winding wire (e.g. with varnish insulated copper wire) is the same. For the production of the (primary winding and the secondary winding), Wiokel wires are used the same outside diameter is used. The one in a turn or introduced into the grooves 3 in several turns one above the other The winding wires are thus firmly fixed in the axial direction of the coil body, the primary winding with the Wiokel-

• ι ■ ■

beginning A ₁ and the end of the winding E ₁ is hatched in the section, the secondary winding with the beginning of the winding Ag and the end of the winding E _g '

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shown unhatched. The transitions of the winding wires, indicated schematically by simple lines, from a transverse groove to the adjacent transverse groove take place in two diagonally opposite, continuous longitudinal grooves h and 5 of the bobbin 1, which extend down to the bottom of the transverse grooves Windings fixed by binding and / or gluing, so that the few, tightly wound turns are also sufficiently tight in the radial direction. " and thereby guarantees the degree of coupling.

The following is intended to refer to the various winding schemes in the exemplary embodiments discussed in more detail, the transverse grooves 3 of the bobbin being numbered consecutively from left to right.

In Pig 2, the primary winding comprises from winding start to winding end of a winding in the third groove, two superimposed turns lying in the zvreiten Rille- and three superimposed turns lying in the first groove _e corresponding to the Sekundsfxvüoklung comprises two Ubereinanderlicgonde turns in the fourth groove, three Uber Superimposed Turns in the fifth groove, three turns in the sixth groove and three turns in the seventh groove, one above the other.

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BAD ORIGINAL 9 0 9804/0700

In Fig. 3 the primary winding comprises one turn in the first Groove, two superimposed turns in the second groove, three superimposed turns in the third groove, an I. another turn in the second groove and another turn in the first groove. The secondary winding comprises one turn in the third groove, three superimposed turns in the second groove, two further superimposed turns in the third

■ - \ t groove and three superimposed turns in the fourth, fifth and sixth groove.

In FIG. K, the primary winding comprises one turn each in the first, second, third, fourth, fifth, sixth and seventh grooves. Above the turns of the primary winding, in the individual grooves, there are two turns 6, marked in section by a cross, made of a plastic fiber, the diameter of which is the same as the groove width. These intermediate turns serve as spacers. The secondary winding comprises turns applied to the intermediate turns, one of which is arranged in the first groove, two each in the second, third, fourth, fifth and sixth groove and one in the seventh groove.

The invention is not limited to the illustrated embodiments limited. Of course, other winding schemes can also be used come into use.

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MMJOIHG ΟΛΟ

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Claims (3)

U62251 P atent ans priiche 1) j Winding structure of a Klcinübortragero with a defined degree of coupling and defined own coupons for trciiisistorisicrte Loitungssteigerlcer der Xrägerfrequeuzitcclmik, dadui-ch characterized in that the individual windings of the ÜLertrageruiclvltuigen in groove-shaped transverse grooves (3) of the bobbin (l), the width of which is equal to the diameter of the insulated winding wire. 2) winding structure according to claim 1, characterized in that the transition of the winding wire from one groove to the other and the setting of the winding wire ends in longitudinal grooves (4,5) of the
Bobbin (l) takes place. 3) winding structure according to claim 1, characterized in that the spacers between the turns of the primary winding and the turns of the secondary winding are intermediate turns (6) made of a plastic fiber, the outer diameter of which
Corresponding to the groove width. documents BAD OHIGlNAU 909804/0700
3