Impact of a Non-Perfect Transformer in the Behavior of Three Phase Resonant Converter

This paper compares the operating of a three-phase, high frequency, series resonant converter (700 kHz, 15 V-15 V, 100 W) with balanced and unbalanced transformer. Analytical equivalent single phase circuit modelling of three phase transformer is described for both cases. A new design of planar transformer is proposed which allows for a better balancing of the magnetomotive force. The sizing method of such transformer is detailed.