DE1920429U - TUNED TRANSFORMER, IN PARTICULAR LINE TRANSFORMER. - Google Patents

Description

P.A. 883

Standard Elektrik Lorenz AG
Stuttgart-Zuffenhausen
Hellmuth-Hirth-Str. 42

SEL / Reg.1O 72? Gm
D. Mayer - 2

Tunable transformer, in particular Flyback transformer

The innovation relates to a tunable transformer, as it can be used in particular as a line transformer for the horizontal output stage in televisions.

In various application cases, one strives to be able to control the operation of the transformers occurring harmonics and thus to achieve certain effects. One such use case is, for example, found in the flyback transformer for the horizontal output stage of television sets. As a result of the inevitable - and in this case desired - leakage inductance When a flyback transformer is operated, the third harmonic of the flyback frequency is formed in particular. This third one The harmonic of the return frequency now has two properties which one seeks to exploit; namely, it has a subtractive effect to the primary voltage and, out of phase by 180 °, adding to the secondary voltage. This is on the primary side reduces the peak voltage, which is particularly desirable with regard to the line end tube. Occurs on the secondary side Due to the adding effect, an increase in voltage, which is also aimed for for understandable reasons.

December 4, 1964

(Fra) / Ir / La -2-

SEL / Reg. 10 723 gm

-2-

It therefore depends on the transformers with which you want to use a harmonic, e.g. the third harmonic, as with the flyback transformer mentioned in the example, to be interpreted in such a way that the preferred harmonic can develop to the desired extent. The production of such Transformers is therefore relatively expensive, as there may be considerable changes in the manufacturing tolerances the electrical conditions in the finished transformer.

The innovation has therefore set itself the task of creating a transformer in which the adjustment to the desired Harmonic is easily feasible. A tunable transformer, in particular a Line transformer for the horizontal output stage of televisions proposed, which is characterized in that the primary coil and the secondary coil are arranged next to one another on the transformer core and that the degree of coupling can be adjusted by changing the distance between the two coils is.

The innovation is made using the figure on the basis of a Embodiment explained in more detail.

In the figure is a transformer, in particular as a line transformer should be used, indicated. The primary winding 1 and the secondary winding 2 are next to each other wound on one leg of the transformer core 3. Both windings are separated from one another by the distance a. The line of force flows are entered in the figure with dash-dotted lines.

SEl / Reg. 10 723 gm

—3—

For tuning to the desired harmonic, in the example So on the third harmonic of the flyback frequency, it is only necessary to change the distance a between the two windings. This changes the degree of coupling of both windings, the leakage inductance is also changed and thus the required tuning to the third harmonic is achieved the return frequency is reached.

It goes without saying that the furnace is not tied to a specific transformer core. So could too a toroidal core or any other transformer core can be used; the only thing to note is that both coils can be arranged next to each other.

1 eye protection claim

1 sheet drawing with 1 figure

-4-

Claims (1)

KÄJI3135 * 12/11/64 {,. SEL / Reg. 10 723 gm Protection claim Tunable transformer, in particular line transformer for the horizontal output stage of television sets, characterized in that the primary coil (1) and the secondary coil (2) are arranged next to each other on the transformer core (3) and that the degree of coupling is achieved by changing the voltage the distance (a) between the two coils is adjustable. December 4, 1964
(Fra) Ir / La