A new ZVT interleaved high step-up converter with ripple cancellation for photovoltaic systems

This study introduces a high step-up converter that utilizes a winding cross-coupled inductor paired with a novel auxiliary circuit. The auxiliary circuit facilitates zero-voltage switching (ZVS) for the main switches while ensuring zero-current switching (ZCS) for the auxiliary switch. Besides, a ripple cancellation technique is employed to reduce input current ripple. The converter achieves high voltage gain, thereby reducing voltage stress on the main switches. Moreover, the auxiliary switch operates for a brief period, keeping the circulating current in the auxiliary circuit low and minimizing associated losses. On the other hand, the auxiliary circuit has a low number of components and can be expanded to more parallel branches of the converter without increasing the number of switches. The proposed converter's design and functionality have been rigorously analyzed and verified through simulations using PSPICE software. Additionally, a 100 W prototype has been constructed to validate both the theoretical analysis and the simulation outcomes.

A new ZVT interleaved high step-up converter with ripple cancellation for photovoltaic systems Keywords:

High step-up converter , Interleaved , Soft switching , Photovoltaic system