ZVT interleaved synchronous buck converter with passive soft-switching cell

This paper presents a ZVT(zero-voltage-transition) interleaved synchronous buck converter with passive soft-switching cell to achieve ZVS(zero-voltage-switching) of MOSFET switches. The proposed interleaved buck converter is composed of two synchronous buck converter modules and passive soft-switching cell. The passive soft-switching cell consists of coupled-inductor and DC-link capacitor. All switches operate with ZVS by the current of auxiliary coupled-inductor. Comparing the conventional interleaved buck converter, the proposed interleaved buck converter reduces the switching loss and increases the efficiency by using only passive components. In this paper, mode analysis and design consideration is described in detail for operating the ZVS. The proposed ZVT interleaved synchronous buck converter is verified with experimental results.