A Non-Isolated Bidirectional DC-DC Converter with Wide Voltage Conversion Ratio and Soft-Switching Capability

A non-isolated bidirectional dc-dc converter (BDC) consisting of a modified interleaved buck-boost circuit and a neutral-point-clamped (NPC) structure as a voltage multiplier cell is suggested in this paper. Employing a voltage booster cell and series connection on the high voltage side (HVS) allows us to attain a higher voltage conversion ratio (VCR) than similar ones. The voltage stress on the switches is decreased, making it feasible to use power switches with smaller onresistance and voltage ratings. The presence of two phases on the low voltage side (LVS) reduces the input current ripple to the energy storage element and increases its lifespan. The zero-voltage switching (ZVS) characteristic alleviates the switching losses and enables us to raise the switching frequency to improve the power density. PWM plus phase-shift (PPS) is the modulation method used in the proposed topology that provides voltage-matching control ( VMC), which minimizes the circulating current and helps the converter operate in the most optimal condition. After introducing the suggested topology and its operational principles, some of its analytical relationships are examined. Finally, the simulation results corresponding to 40-50 V to 400 V at rated power are shown.