Voltage-Scaling of a Phase-Shifted Full-Bridge Converter While Maintaining Dynamic Performance

The demand for highly dynamic automotive electrical energy systems is increasing day by day. Battery electric vehicles contain high energy traction storages being capable of supplying low-voltage loads. This requires the development of a new electrical architecture that incorporates robust DCDC converters between the high-voltage battery and low-voltage components. In order to achieve high dynamics, a Phase-Shifted Full-Bridge (PSFB) converter is suitable. This paper introduces the scaling of a highly dynamic 400 V/12V PSFB to a lower 4SV/12V class while keeping the dynamic properties and responses. Verification between small-signal model and a switched simulation is performed. The prototyped scaled PSFB converter, while being subjected to high-dynamic current pulses, displays deviations with a maximum of 2 % in contrast to the 400 V/12V simulation model of the high-voltage PSFB converter.