Soft-Switching Synchronous Interleaved Boost Converter with an Auxiliary Coupled Inductor

This paper proposes a soft-switching interleaved boost converter using an auxiliary coupled inductor to achieve zero voltage switching (ZVS) of MOSFET switches and zero current switching (ZCS) of the body diodes of the switches. The proposed interleaved boost converter is comprised of two synchronous boost converter modules and the auxiliary coupled inductor and DC-link capacitor connected between main switches of each boost converter module and output stage. All MOSFET switches of the proposed boost converter operate with ZVS turn-on by using the current of the coupled inductor. Furthermore, the current of the coupled inductor enables the ZCS turn-off of the MOSFET body-diodes to eliminate their reverse-recovery process. Consequently, the switching loss of the proposed interleaved boost converter can be greatly reduced. The operation of the proposed soft-switching interleaved boost converter is verified with experimental results.