New Non-isolated Interleaved Bidirectional soft-switching DC-DC Converter with a Low Current Stress and Low Voltage Stress Auxiliary Cell

A new non-isolated interleaved bidirectional soft-switching DC-DC converter (NIBC) with a low current and low voltage stress auxiliary zero-voltage-transaction (ZVT) cell is proposed in this paper. Both main switches and auxiliary switches can realize zero-current-switching (ZCS) turn-on and ZVT turn-off, and all diodes achieve soft-switching condition. Furthermore, auxiliary switches can help to recycle the magnetizing current energy to high voltage side of the converter. Compared with conventional NIBCs with soft-switching cell, in the proposed NIBC, the current and voltage stress of auxiliary switches can be reduced lower than the input current and high voltage side, and it is feasible to select switches with low rated power, low voltage and low current stress as auxiliary switches, thus improve the efficiency and reduce the cost. The operation and design of the proposed NIBC is analyzed in this paper, and simulation and experiments are conducted to verify their validity