HFL High-gain Interleaved DC-DC Converter Operating in DCM and CRCM

In this paper, a high-frequency-link (HFL) high-gain interleaved dc-dc converter topology is proposed. The proposed converter is interleaved at the input end to simplify filter design, and improve performance. The operating principles in discontinuous conduction mode (DCM) and critical conduction mode (CRCM) are discussed for the proposed topology along with steady state analysis. The proposed topology provides soft switching for its devices, thus improves the efficiency. A 450W prototype is developed for experimental verification. The target applications are electrical vehicle (EV) battery charging, photo voltaic (PV) and fuel cell based power supplies, where a low dc voltage is translated to a high dc voltage feeding to an ac inverter with a galvanic isolation.