New ZVT topology for switched inductor high gain boost

This paper proposes a new high gain soft switching dc-dc topology based on switched inductor boost converter (SIBC). SIBC itself as a high gain boost topology has the issue of high conduction loss in switching diodes and high switching loss in the main switches. Also, it has severe EMI issue due to the diode path between input and switching node. The new topology is derived aiming at zero voltage switching (ZVS) turn on of the main switch. The new topology can achieve soft switching for all the switches and alleviate EMI issue. All the diodes achieve a zero current switching (ZCS) turn off without reverse recovery. The soft-switching-SIBC (SSSIBC) also reduces the conduction loss in switching diodes. A numerical simulation in PLECS and a prototype hardware are built for dc-dc stage of a PV micro-inverter 30 V to 200 V 300 W application with 100 kHz switching frequency. A 94.76 % power conversion peak efficiency is achieved.