High Step-Up Full Bridge DC-DC Converter with Multi-Cell Diode-Capacitor Network

This paper proposes a high step-up full bridge isolated DC-DC converter with multi-cell diode-capacitor network which exploits the features of multi-winding transformer and diode-capacitor voltage boost cell. It has the following advantages 1). Increases voltage boost capability and avoid extreme large duty ratio. 2) Achieves almost zero output voltage ripples which reducing the inductance in output LC filter, 3) reduces transformer turns ratio and magnetic component volume. Furthermore, it can use the transformer leakage inductor and resonant capacitor to achieve zero-current switching (ZCS), which is beneficial to increase efficiency.

Keywords—Diode-capacitor network; high voltage gain; full-bridge isolated DC-DC converter; multi-winding transformer; zero-current switching (ZCS)