DE1074145B - Transformer in inverter arrangements with controllable semiconductors - Google Patents

Description

GERMAN

Inverter arrangements with controllable semiconductors are used to supply and control the Semiconductor transformers arranged, which apart from the primary and secondary windings feeding the load circuits nor have control windings feeding the control circuits.

There is a requirement here for a "reduction in switching losses in the controllable Semiconductors for the purpose of better utilization of the same. This is the case with those previously used in such arrangements Transformers could not be reached,

because the cores and winding

arrangements result in relatively large losses. It has now been recognized that these losses are a cause the semiconductors to heat up beyond the normal ambient temperature and thereby a better utilization of the controllable terminal block, z. B. transistors, as is well known Such inverter arrangements are generally controlled so that the transformer up to is magnetized to saturation, then its leakage inductance and its leakage capacitance a play an essential role.

The object of the invention is now to reduce the leakage capacitance and inductance of the Transformer to a negligibly small value a significantly better utilization of the semiconductors to achieve.

This is achieved - as tests have shown - according to the invention by combining the following measures, namely that

a) on the transformer core designed in a manner known per se as a toroidal core, directly the Control winding or windings are applied,

b) that on the control winding or windings the primary and secondary windings (load windings) are wrapped

c) that all windings in a known manner evenly covering the circumference in are wound around the toroidal core in the same direction of winding.

It is known per se to use toroidal cores and the primary and secondary windings in current transformers to be distributed evenly and in the same winding direction on the circumference of the toroidal core. However, there are no control windings here. Such transformers are also used not operated in the saturation area.

To reduce the no-load losses, the toroidal core is dimensioned so that its interior space in itself is known way practically completely filled by the windings.

According to a further embodiment of the invention, transformer

in inverter arrangements
with controllable semiconductors

Applicant: '

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Dipl.-Ing. Läszlo Szecsi, Nuremberg,
has been named as the inventor

The load windings are used to keep the leakage inductance and leakage capacitance as well as the no-load losses small and, if necessary, the control windings are also advantageously subdivided into individual partial windings and the partial windings in a manner shown in the drawing, for example, in more detail on the Toroidal core applied and interconnected.

According to Fig. 1, eight partial windings are arranged around the toroidal core K in addition to a control winding St. Only one side of the windings is shown in a schematic representation, which must be thought of as a mirror image on the other side of the core. Accordingly, the four secondary windings H ₁ to H _{4 are arranged} alternately with the primary windings of a first and second primary circuit 11 ₁ and H ₂ as well as I2 _X and I2 ₂ so that the first secondary winding 1I _{1 is followed by} the first primary winding Tl _{1 of} the first circuit. Subsequently, a second secondary winding H _{2 is} provided, which is surrounded by the first partial winding I2 _{X of} a second and by the second partial winding 11 _{2 of} the first primary circuit, onto which the third secondary winding II3 is then applied; The second partial winding I2 _{2 of} the second primary circuit is located between this and the last secondary winding H _4. The connection of the individual partial windings can be seen from the circuit according to FIG.

In the embodiment of the transformer according to the invention, in connection with a shortening the switching times a significant reduction

909 727/221

tion of the power loss can be achieved in the controllable semiconductors, so that the efficiency of the Inverter arrangements is much better than the known arrangements of this type.

Claims (3)

PATENT CLAIMS: 1. Transformer in inverter arrangements with controllable semiconductors with primary and secondary windings in the load circuit and at least one further winding (S expensive winding) in the control circuit of the semiconductor, characterized by the combination of the following features, namely a) that on the transformer core designed in a manner known per se as a toroidal core the control winding or windings are applied directly, b) that on the control winding or windings the primary and secondary windings (load windings) are wrapped c) that all windings in a known manner evenly covering the circumference in are wound around the toroidal core in the same direction of winding. 2. Transformer according to claim 1, characterized by such a dimensioning of the toroidal core circumference that the core interior is completely filled by the windings in a manner known per se. 3. Transformer according to claim 1 or 2, characterized in that the load windings (primary and secondary winding) are divided into partial windings and as such in the order - starting from the core - first secondary partial winding (H ₁ ), first primary partial winding of a first circuit (H ₁ ), second secondary winding (H ₂ ), first primary winding of a second circuit (12 _χ ), second primary winding of the first circuit (H ₂ ), third secondary winding (H ₃ ), second primary winding of the second circuit (12 ₂ ) and fourth secondary winding (H ₄ ) are arranged one above the other on the toroidal core and are connected in series with one another. Considered publications:
German patent specifications No. 961192, 937 184,
712, 843 271. 1 sheet of drawings 1909727/221 1.60