DE1638914B2 - VOLTAGE CONVERTER WITH DISTRIBUTED WINDING PARTS OF THE PRIMARY AND SECONDARY DEVELOPMENT ON BOTH LEGS OF THE IRON CORE - Google Patents

Description

30th

The invention relates to a voltage converter with on both legs of the iron core distributed winding parts of the primary and secondary winding, of which at least the Winding parts of the primary winding are switched in series.

It is known in voltage converters to wind both legs of the iron core. That has compared to the arrangement of both windings on only one leg of the iron core the advantage that the mean winding length of the winding is smaller, which affects not only the losses of the apparatus, but also has a favorable effect on its structural dimensions.

In the case of the voltage transformers, where both legs of the core have windings, it is also known to assign the primary winding or the secondary winding to each leg. It is also known both the primary and the secondary winding ίο split into two equal winding parts and apply these winding parts to both legs and to be connected in series (German patent specification 589,444).

While the arrangement of a complete winding on one leg leads to a converter with a large spread, the arrangement of two identical winding parts on one leg each has the property of very little spread. The size of the scattering and thus the scattering blind resistance has a considerable influence on the size of the incorrect angle of the voltage converter. For example, if the leakage resistance is small and the cos / ?, that is, if the inductive load is present, this leads to a large positive error angle, while if the leakage resistance is too high, öj and cos /? = 1, i.e. real burden, the error angle is too far in the negative range. For example, in the case of a voltage converter with primary and secondary windings distributed on both legs and a cos / S = 0.5, the error angle can already be so far in the positive range that it determines the entire dimensioning of the converter. If one goes over to a winding arrangement in which an undivided winding is assigned to each leg, the field angle is very favorable at cos β = 0.5, but with a real burden it becomes too negative.

The winding arrangement has to do with the dimensioning of the transducer has a significant impact, and it is the purpose of the invention to be economical favorable sizing to come.

The invention is based on the object by changing the winding structure of a voltage converter to influence the spread in such a way that the skew angle for a required load power factor comes to a low value, while it comes with several required load power factors should be placed on an optimal value.

According to the invention, this object is achieved in a voltage converter of the type described in that one leg carries more than 50% of the turns of the primary winding and the other leg carries more than 50% of the turns of the secondary winding, the portions of the primary winding and those of the secondary winding the individual legs are chosen so that the stray blind resistance of the transducer arrangement has such a size that when a certain load angle β is used as a basis, a minimum error angle results and when several certain load angles are used as a basis, an optimal error angle results.

It is particularly advantageous if the proportions of the number of turns on the legs are chosen so that that the sum of the number of primary turns and that multiplied by the transmission ratio Number of secondary turns is the same or approximately the same on both legs, then the middle one wail Winding diameter is cheapest.

It is already known for current transformers and capacitive voltage transformers, the winding to be distributed unevenly on both legs.

With the current transformer, however, this measure serves a completely different task, namely fine-tuning of the windings (Swiss patent specification 247,754). The voltage converter (Swiss Patent 408,200), on the other hand, only the secondary winding is unevenly distributed, so that neither was achieved Keeping the mean coil diameter small still achieves a minimal or optimal misalignment will. Rather, it is a matter of achieving such an inductance that with normal capacitances Resonance conditions can be achieved.

An embodiment of the invention is explained below.

In the drawing, a magnetic core 1 with two legs 2 and 3 is shown, which is made of laminated electrical steel sheets consists. Parts of a secondary winding 4 sit directly on the legs 2 and 3, with it can already be seen from the winding cross-section shown that the leg 3 has fewer turns the secondary winding 4 carries as the leg 2. In contrast, a primary winding 5 is so on the leg 2 and 3 divided so that the leg 3 carries a larger number of primary turns than the leg 2. The division ratio is chosen so that the winding cross-section of the two partial windings is approximately the same on the two legs.

1 sheet of drawings

Claims (2)

Patent claims: 1. Voltage converter with winding parts of the primary and secondary winding arranged distributed on both legs of the iron core, of which at least the winding parts of the primary winding are connected in series, characterized in that one leg (3) has more than 50% of the turns of the primary winding (5 ) and the other leg (2) carries more than 50% of the turns of the secondary winding (4), the proportions of the primary winding and that of the secondary winding on the legs being selected in such a way that the stray blind resistance of the transducer arrangement is of such a size that On the basis of a specific load angle β, a minimum and, if several specific load angles are taken as a basis, an optimal error angle results. 2. Voltage converter according to claim 1, characterized in that the sum of the primary turns and the number of secondary turns multiplied by the gear ratio is the same or approximately the same on the two legs.