DE888875C - Heavy-duty interference protection choke - Google Patents

Description

Heavy-duty interference suppression chokes Interference suppression chokes are almost excluded switched into the useful circuit and must therefore for the size of the useful current be dimensioned. This requires the choice of larger wire cross-sections and thus an enlarged spatial shape. As a result of the pre-load, the inductance decreases, whereby the interference suppression effect also deteriorates.

It is desirable to build the throttles so that they are at the smallest Three-dimensional shape have the greatest possible inductance and maximum load capacity.

Various paths have been taken to get this ideal case to approach. Mostly, however, there had to be an advantage on the one hand: through disadvantages the other side must be accepted. On the basis of investigations has now show that with a certain structure of the throttle an optimum effect and load capacity achieved with the smallest dimensions. According to the invention, the coil core be designed as a rod core with a round cross-section and to avoid stray fluxes the entire core must be magnetically closed. Furthermore, the winding must only be under Interposition of a thin insulation layer directly on the round rod core be applied and only have a small height in relation to their winding length, and finally, the entire choke must preferably have insulating means that conduct heat well to be soaked.

The round coil core is the most appropriate spatial solution. At the same time it can be used as a Winding mandrel can be used for winding.-Only - In order to avoid shunts, a thin layer of insulation is placed between the core and the winding, For example from oil silk or from a paint or the like. Provided. By saving the so-called bobbin, space is initially gained and on the other hand the. Almost complete open cross-section located inside the coil .filled with magnetic material. The dimensioning of the winding length to the winding height, which is expediently kept in the order of magnitude of 8: i requires a still favorable heat dissipation while achieving favorable inductivity values. For this. it is also necessary to close the coil rod magnetically to avoid leakage flux to avoid any kind. Due to the impregnation of the winding. become insulating Air cushions .within. The winding are switched off and especially when that Impregnant itself is a good heat conductor, which is good for example through additives heat-conducting materials (quartz powder) can also be made of impregnation material, the heat from the inside of the winding good to the coil core or to the outside. derives.

Those carried out on chokes of the above type: Investigations yielded surprising results - Compared to a throttle of the usual design with - square core and coil body resulted in the same current carrying capacity 2.5 times the inductance.

As is well known, the possible heat dissipation is decisive for the current load capacity. In addition to the measures already mentioned, the following additional measures can be taken meet. The core parts in particular, the yokes of the throttle, are more extensive Form designed so that - these are effective as a cooling flange. By A: uf§efzen @: xlieser: Cooling surfaces on apparatus parts that conduct heat well can still have the effect to a large extent be improved, - whereby it is in the sense of the desired effect, through large-scale Beer agitation between the heat transferring dividers, heat transfer resistances, such as air cushions and the like. To get the heat out of the other core parts well and safely dissipate, it is advisable to .mit each other the abutting core parts to glue. In -a-throttle specially constructed in this way resulted also the surprising result, that the choke with 2.8 times the current compared to a conventional throttle could be loaded when the same final temperature was achieved.

In the drawing are examples for chokes according to the invention shown.

In FIG. I, a two-legged throttle, as it is normally required, is shown, with the cylindrical coil core parts being denoted by a and b. These stand over yokes c and d, both of which can also be designed in any of the types shown, in a good magnetic connection. It is expedient to connect the core parts to one another by gluing in order to avoid heat-insulating and intermediate air layers that could make it difficult to dissipate heat from the core parts. In this case, yoke c is designed as a cooling surface due to its enlarged shape. The winding e and f, which is located on the core parts b and a, is applied to these only with the interposition of a thin electrical insulation layer (not shown) and, as already described above, is relatively flat.

In FIG. 2, one is even more favorable with regard to heat dissipation Embodiment shown as a single leg throttle. The coil core g, the -, the-winding: yes carries, is used in a tub-shaped yoke i-, which both for a good magnetic connection as well as good heat conduction from the winding to any one Under-hunt ensures. 'The tub-shaped yoke can still improve its effectiveness with metallic device parts .in: are in thermal contact.

The windings e, f and lt are preferably impregnated with insulating means that conduct heat well in order to also avoid air cushions inside the winding.

Claims (5)

PATENT CLAIMS: i. Heavy-duty interference suppression choke for high frequency, characterized in that @ d'ass the Spulenl #: ern insofar as it is within the coil winding located, designed as a rod core with a round cross-section .isst that to avoid from leakage flux the entire core is magnetically closed that the winding is under Interposition of a thin insulation layer applied directly to the round rod core is' and in relation to its length foolishly low ° _.Iiihe. "_ altenfv @ rei @ st dun @d @ that the entire choke is preferably impregnated with insulating material that is a good conductor of heat is. - 2. interference suppression choke according to claim i, da-, characterized in that Idas The ratio of the winding length to the winding height is approximately 8: i. 3. Noise suppression choke according to claim i, characterized in that the core parts are glued to one another are. 4. S-interference protection choke according to claim i to 3, characterized in that individual core parts, preferably the yokes, a large-scale design for have better heat dissipation. 5. interference suppression choke according to claim i to q., characterized in that the core parts serving as cooling surfaces dissipate heat Documents are in thermal contact. - Printed publications: Austrian Patent No. 129493; Swiss Patent No. 161 188; German patent specification No. 614 6q.9.