DE3151642A1 - LINE TRANSFORMER FOR TELEVISION DEVICES - Google Patents

Description

K.Fraunhofer 7-6 Line transformer for televisions

The invention relates to a line transformer for television sets, consisting of at least one primary and at least one secondary winding, in which at least the winding of the primary winding is made of a metallic foil with a plastic foil inserted between these as insulation, and which is wound in this way it is coordinated that the secondary alternating high voltage, in particular, odd harmonics ^. 5th order of fundamental wave contains.

Line transformers are known (DE-PS 25 04 355), in which the high voltage generated is kept particularly constant by the fact that the alternating high voltage of the line transformer to odd harmonics ^ 5th order is voted. With the well-known Line transformers are both the primary and the the secondary winding (high-voltage winding), executed in chamber winding technology, i.e. the windings are wound on a bobbin, the winding space in meh rere chambers is divided. The high voltage winding in the known flyback transformer is in three Partial windings divided, of which two partial windings are matched to the seventh harmonic and one partial winding is matched to the fifth harmonic. this

K.Fraunhofer 7-6

takes place in that the primary winding has an uneven density distribution, which in the way is realized that the primary winding is divided into a plurality of chamber windings, which have different numbers of turns.

However, the known flyback transformer has the following Disadvantage:

As there is only a limited winding space for the primary winding are available are changing the winding numbers in the different chambers of the winding body for the primary winding through which the vote for should take place for the most part, limits are set so that the secondary winding, i.e. the high-voltage winding, used to a considerable extent for the coordination must become.

The problem to be solved now consists in specifying a flyback transformer according to the preamble of claim 1, in which the tuning of the alternating high voltage to odd harmonics 21 of the 5th order is mainly carried out by measures on the primary winding.

This object is achieved according to the invention in that the Coarse tuning and fine tuning in the Way that the coarse tuning is divided by a Change in the width, the axial position and / or the radial position of the metallic foil of the primary winding and the Fine tuning is effected by an inhomogeneous winding density distribution of the high-voltage winding.

By choosing the right width of the metallic foil,

• «· ♦

K.Fraunhofer 7-6

from which the primary winding is made, as well as the axial position and / or the radial position of the primary winding is already approximately the coordination of the alternating high voltage to the desired resonance frequencies achieved. The fine tuning is done by a different winding density of the high voltage winding, which, for example, made of wire on one with chambers provided bobbin is wound ..

The specified measures can result in the coordination of the Alternating high voltage of a flyback transformer to odd harmonics >. 5th order can be carried out with less effort than with the known flyback transformer. The proposed teaching can be used both at such flyback transformers are used in whose Primary and secondary windings are made in foil winding technology, as well as with line transformers such as whose secondary windings are designed using chamber winding technology.

The invention is shown below in FIGS Explained on the basis of an exemplary embodiment, they show:

1 shows the circuit arrangement of a flyback transformer,

Fig. 2 shows the structure of the windings in an embodiment of a flyback transformer and

3 shows the longitudinal section through a flyback transformer according to FIG. 2.

Fig. 1 shows the circuit arrangement of a line transfer

K. Fraunhofer 7-6

formator, which has a primary winding A. On its secondary side, two Hi Ifs windings B and C are arranged, which supply Hi Ifs voltages with relatively low voltage values. The high-voltage winding of the flyback transformer is divided into three partial windings W *, W- and W. The fact that diodes D,., D _{2 are} connected between the individual partial windings W,., W ₂ and W _{3 of} the flyback transformer makes it clear that the embodiment of the flyback transformer shown is a diode-split cell transformer.

Fig. 2 shows the actual structure of a line transformer according to FIG. 1. This contains the so-called film roll 1 and the bobbin 2, which has a plurality of chambers in which the partial windings W,., W_ and W, are arranged as wire windings. the The ends of the partial windings are led to solder support points, to which the diodes are also soldered. When the line transformer is finished, the film roll 1 lies in the Bobbin 2.

The longitudinal section through such a finished flyback transformer is illustrated in FIG. 3, in which the film roll 1 and the coil former 2 are arranged on a base 3 and in a housing 4. The high-voltage winding consists of the parts Iw.i ck lungs W *, W-, and W ,, with which the diodes D., D ₂ and D are connected in series in the manner shown in FIG. The high-voltage connection 5 is led out of the housing at the upper end, while all other connections are led to socket pins 6, of which only one is shown for the sake of simplicity.

K. Fraunhofer 7-6

The primary winding A is particularly emphasized in FIG. 3 as part of the film roll 1. She owns the Width L, which is less than that for the foil neck 1 is the total available width W.

The coarse adjustment of the alternating high voltage of the line transformer to odd harmonics j * 5th order is carried out according to the invention in that the correct width L is selected for the primary winding A. One further improvement of the coarse tuning can be achieved by the axial and / or radial position of the primary winding A take place. The radial position of the primary winding A means that the primary winding A can assume any local position in the foil winding between R2 and R1. Axial Position of the primary winding A means that the primary winding ment A with the width L any local position along the total width W can take.

This coarse adjustment can achieve up to 95% of the optimum adjustment. When the primary winding A is in the appropriate position, the partial winding W _{1 is} on the 5th harmonic and the partial windings W ₂ and W, matched to the 9th harmonic of the alternating high voltage basic wave. The fine tuning that is still required can be achieved by a deliberately produced inhomogeneous winding density distribution in the high-voltage winding be achieved. This can be done, for example, that in the individual chambers of the bobbin on which the parts of the high-voltage winding are wound there are different numbers of turns.

Claims (1)

STANDARD ELECTRICS LORENZ
Aktiengesellschaft
Stuttgart K.Fraunhofer - P.Bracke 7-6 Expectations \ y. Line transformer for television sets, consisting of at least one primary and at least one secondary winding, in which at least the winding of the primary winding is wound from a metallic foil with a plastic foil inserted between them as insulation and which is coordinated in such a way that the secondary alternation -High voltage in particular odd harmonics > _ 5th order of the fundamental wave contains / characterized in that the tuning is divided into a coarse and a fine tuning in such a way that the coarse tuning by changing the width, the axial position and / or the radial position of the metallic foil of the primary winding and the fine adjustment by an inhomogeneous winding density distribution of the high-voltage winding. 2. flyback transformer according to claim 1, characterized in that that the high voltage winding on a bobbin is arranged with a plurality of chambers and different for fine tuning in the individual chambers Number of turns of the high-voltage winding are arranged. ZT / P3-Bö / Gn - 2 - 12/10/81