An Analytical Model to Determine the Required Charge Near Zero Crossings for Zero Voltage Switching on Single-Stage Isolated Three Phase AC/DC Series Resonant Converter

The single-stage isolated three phase AC to DC series resonant converter with optimal trajectory control technique ensures zero voltage switching for all switching events. Zero voltage switching can be achieved through the utilization of resonant current to charge or discharge parasitic and parallel capacitances of the switching node. However, near zero crossings of the resonant current, the resonant current may not be sufficient to completely charge or discharge the parasitic and parallel capacitances. In this research, an analytical model is presented and experimentally verified to determine the required charge near zero crossings for zero voltage switching in the single-stage isolated three phase AC to DC series resonant converter.