Design and Implementation of a Phase Shifted Full Bridge Converter with Cascaded Feedforwarded Control for an Electric Vehicle

A phase-shifted full-bridge (PSFB) DC-DC converter is widely used for medium to high power applications in an electric vehicle. The control strategy is the main focus of this paper, considering its soft-switching behavior to achieve zero voltage switching (ZVS) to increase the overall efficiency of the converter. The selection of components for an isolated converter is studied and discussed. A closed loop control is designed and an aspect of achieving ZVS operation with control is implemented, and the result is presented to verify the performance of the PSFB converter in the cascaded feedforwarded control. A 1.2 kW, 100 kHz, 400V–12V PSFB isolated standalone DC-DC converter is designed and implemented with control to achieve ZVS with closed loop operation. The design is done based on the theoretical specification to have a better understanding. The results for different load variations are presented to verify the proposed control strategy.