Abstract : Planar technology is very interesting for transformer used in aeronautical equipment because components are very thin so they can be used into small space. Unfortunately, dimensioning such transformers, when they work at frequencies upper than 100 KHz, is a difficult work because rules and tools conception are not the same as in standard winding transformers.
In this thesis, transformers are represented by equivalent circuits and they are identified by impedance measurements. Due to the high number of circuit parameters, optimization of such component will be compromised if parameters computations were based on fem simulations. That is why we have focused this work on analytical computation. The goal is to deduce equivalent circuit parameters with analytical calculation based on physic and geometric caracterisitics. For example, each element of the static leakeage transformer can be deduced using PEEC formulas.
Then, problems due to parallel windings, which always appear when transformer current are close to hundred Amperes, are studied. A simple analytical calculation based on one dimensional propagation enable to realize equivalent circuit and Pspice simulations in order to find quickly the best arrangement of windings conductors.
In the last part, copper losses in transformers and also in rectangular conductors are studied. Solutions are tested by fem simulations in order to reduce eddy current losses. Multipolar development is finally used for optimizing these losses.