JPH0316771B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high frequency transformer, and more particularly, the present invention relates to a high frequency transformer, and more particularly, to a high frequency transformer using an oxide ceramic core material, a winding tube 5 and a flange 3.
further comprising multilayer windings 9, 11 wound one on top of the other and housed in the winding space between the flanges 3, the individual windings 9, 1
1 are insulated from each other by an insulating foil 31, spacers 25 and 26 are provided between the winding ends around the shaft and the flange 3, and spacers 25 and 26 are provided between the winding ends around the shaft and the flange. It relates to high frequency transformers with high operating voltage frequencies and large differences between primary and secondary voltages, producing high voltages.

Transformers are susceptible to and have no resistance to cleave or creepage currents, particularly at high operating voltages, large operating voltage differences, and high operating frequencies. Special measures must therefore be taken to increase the path length of the cleave current.

It is known to increase the length of the cleave current path of a transformer by inserting an insulating foil between windings with significantly different voltages.

However, the transformer region near the flange of the coil formation nevertheless remains in a critical condition. This is because the cleave path is relatively short in these areas. From German Utility Model No. 6937815, the length of the cleave passage is increased by inserting into a coil formation with a first winding a further coil formation with a further winding installed. It has been known. However, this is only suitable for transformers with low operating frequencies. The reason is that such transformers do not require intimate deep coupling.

It is known from German Patent Application No. 2730440 to insert an elastic collar into the slot groove between the secondary coil, its end around the shaft and the flange of the coil formation of the transformer. This resilient collar keeps the secondary coil at a fixed distance from the coil flange. The length of the cleave current path is thus increased.

However, this structure is very inflexible. The reason is that a collar can only be used for one type of coil or transformer at a time. Furthermore, guiding the tangent of the coil beyond the collar remains a challenge.

The aim of the invention is to provide a transformer in which the known collars are substantially simplified, allowing even tangential and large connecting strips to be guided out of the coil space.

The object according to the invention is achieved in that the spacers are constructed as spacer blocks 25, 26 distributed along the winding circumference and guided in dovetail guides 27.

These spacer blocks have a simple construction and allow the tangent or connecting strip to be fed from the flange and the tangent by virtue of forming a space between the layer end and the flange around the axis. enable. This structure is extremely flexible with respect to transformer deformation and is particularly suitable for automation of the winding process.

In other embodiments according to the invention, the width of the spacer blocks is selected according to insulation requirements. The transformer can be easily adapted to other insulation requirements by varying the width of the spacer blocks.

In another embodiment according to the invention, the spacer block is fixed to the flange of the coil so that it is guided in a guide around the axis.

This transformer structure is suitable for round winding spaces as well as round winding spaces. The guidance for the spacer block on the flange of this coil can also be adapted to the relevant requirements. Thus, a dovetail guide can be provided, but it is also simply possible to provide a transverse guide. If adhesive is used, the guide can be omitted. The mounting of the spacer block on and against the flange of the coil is dictated and determined solely by manufacturing requirements.

Embodiments of the present invention will be described in detail below with reference to the drawings.

This drawing shows the right half of the transformer with the windings partially cut away.

A transformer having this oxide ceramic core, that is, an iron oxide ceramic core, has a coil forming body 1.
, a flange 3, and a winding tube 5 that connects the flange 3 to each other. Flange 3
The winding space 7 between the winding tube 5 and the winding tube 5 is filled with a primary winding 9 and a secondary winding 11, for example. In addition to the rims or projections 17 extending through the winding tube 5, there are two yokes or yokes 13, each located at the axial transformer ends, and two further outer projections (rims). ) 15, an oxide ceramic material is used to close this core. On the flange 3 there is a plastic jacket 19.
A tangent line 21 is provided which is cast into.

First of all, the primary winding 9 of the transformer is placed on the winding tube 5.
is wound. The ends 23 around the axis of this winding 9
abuts a spacer block 25 inserted between the winding end 23 around the shaft and the flange 3 of the coil. The height of this spacer block 25 corresponds to the height of the winding of the primary winding 9. This spacer block 25 is guided in a dovetail guide 27 of the flange 3 of the coil. Thus spacer block 2
5 is fixed to the flange 3 of the coil. In this embodiment, the two spacer blocks 25 at each winding end 23 are located opposite each other.
However, as an alternative to this, three spacer blocks could be used which are offset in relation to each other. The spacer block thus has a space of 2 between the layer end 23 around the axis and the flange.
Leave 9. These gaps are suitable for deriving the coil tangent.

As you can see from the partially cut-out drawing, insulating foil 3
An insulating foil 31 is placed on the primary winding 9 such that the foil 1 extends across the spacer block 25 to the flange 3 of the coil. On this insulating foil layer 31,
A secondary winding 11 is wound and the ends of the secondary winding 11 around the axis abut against the spacer block 26. The height of the outer spacer block 26 corresponds to the height of the secondary winding 11. Across this secondary winding 11 another insulating foil, not shown, is arranged, including a spacer block 26.

Using this structure, it is of course also possible to deposit further windings. The spacer blocks 25, 26 can be manufactured very simply and can be arranged according to the type of transformer concerned.
can be made wide or narrow, and their height can be made large or small. Furthermore, these spacer blocks can be secured to the flanges of the coil by means of other guides than dovetail guides.

In summary, the invention comprises a coil formation 1 for multilayer windings 9, 11, which consists in particular of an oxide ceramic core and can furthermore be provided in the winding space 7 between the flanges 3. The individual windings are arranged one on top of the other and are insulated from each other by an insulating foil 31. a coil end 23 around the axis;
Spacer 25 between coil forming body flange 3
but keeps the coil end 23 around the axis at a certain distance from the flange 3 of the coil former. These spacers are distributed along the winding circumference and are spaced between the winding end 23 and the flange 3 around the axis.
9 (see drawing).

[Brief explanation of the drawing]

The drawing shows the right half of the transformer with some of the windings cut away. DESCRIPTION OF SYMBOLS 1... Coil forming body, 3... Flange (coil flange), 5... Winding tube, 7... Winding space, 9
...Primary winding, 11...Secondary winding, 13...Yoke, 15...Outer protrusion, 17...Protrusion (rim), 19...Plastic jacket, 21...Tangential line,
23... Winding end around the shaft, 25... Spacer block, 26... Spacer block, 27...
Dovetail guide, 29...〓, 31...Insulating foil.

Claims (1)

[Claims] 1. A bobbin consisting of an oxide ceramic core material, a winding tube 5 and a flange 3, and a multi-layer winding wound one over the other and housed in the winding space between the flanges 3. wires 9, 11, the individual windings 9, 11 are insulated from each other by an insulating foil 31,
In addition, spacers 25, 26 are provided between the winding ends around the shaft and the flange 3 to create a gap between the winding ends around the shaft and the flange, which increases the operating voltage frequency and the primary and secondary In high-frequency transformers with large differences between voltages, the spacers are arranged in spacer blocks 2 distributed along the winding circumference and guided in dovetail guides 27
A high frequency transformer characterized in that it is configured as 5,26. 2. The high frequency transformer according to claim 1, wherein the widths of the spacer blocks 25, 26 are selected according to insulation requirements.