Optimization of the Operating Frequency of a Bidirectional Synchronous H6 Inverter

This paper assesses the impact of the new SiC switching technology vs. Si MOSFETs to provide optimal efficiency for a 5 kW bidirectional H6 inverter intended for residential building applications. The study applies an analytical model to predict the losses of a synchronous H6 transformer-less topology based on PSIM simulation results. The results show that SiC provides up to 98.3% efficiency compared to 93.6% achieved with Si. In addition, further improvement of efficiency is achieved by increasing the operational frequency up to 50 kHz, whereby the passive components size is also reduced.