A Novel High Gain Unidirectional Buck-Boost DC-DC Converter with Active Switched-Inductor Configuration

A Novel non-isolated buck-boost DC-DC Converter is proposed in this paper for high voltage gain (HVG) applications. The proposed converter has a voltage gain of 2/(1-d) times that of the conventional buck-boost converter and provides this gain with fewer components. An active switched inductor (ASI) is incorporated in the proposed converter, to mitigate voltage and current stress on the components, particularly in the high-voltage section. Apart from HVG in buck-boost mode, the proposed converter provides noninverting output voltage, and continuous input current without using any coupled inductor and transformer. Hence, the proposed converter is compact and is suitable for renewable energy and fuel cell applications. One notable advantage of the proposed topology is the minimized voltage stress experienced by the switches and intermediate capacitors. Detailed explanations are given regarding the working principle and steady-state analysis of this converter. Furthermore, the dynamic modeling of the converter allows for voltage and current control operations, and simulation results are presented to verify the theoretical analysis.