ABSTRACT

In this Project, a new SEPIC-based step-up dcdc converter which integrates discontinuous-current quasiZ-source (qZS) and switched-capacitor networks is proposed. The proposed converter has a low input current ripple, wide voltage gain range, low voltage stress on the semiconductor devices, and a constant potential difference between the grounds of its input and output ports. These features make the proposed converter an excellent interface between the fuel cell and the dc-link bus inside the electric vehicle. The analysis of the proposed converter for steady-state operations in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are given. Finally, a 3-kW/800-V scaled-down prototype was built using a Gallium Nitride (GaN) power switch and Silicon Carbide (SiC) diodes to validate the feasibility of the proposed converter and its theoretical analysis.