A Bidirectional AC/AC Series Resonant Converter with High Frequency Link

The study and use of solid state transformers (SST) has grown exponentially, and new technologies are being developed every day. The application of a series resonant converter in a SST allows improvement of its efficiency, through soft switching of the power switches. The present paper proposes a bidirectional topology capable of receiving an AC voltage in its input, and delivers the same AC voltage on its output through a series resonant converter and a push-pull AC-AC converter, with all switches operating with soft switching. The converter has three different switching elements and is capable of adjusting the output voltage level by changing the switching frequency. In this paper, the description of the converter's operation and simulation results are presented. A prototype is being built to be tested in laboratory.