A transformer-less high efficiency interleaved buck converter with improved step-down conversion ratio and a pre-charging setup through snubber circuit

This paper proposes a transformerless improved step-down conversion ratio Interleaved Buck Converter (IBC) with low switch voltage stress, which is achieved through capacitive voltage division. A snubber circuit is also incorporated which can perform as an auxiliary circuit for capacitor pre-charging as well as can perform snubber function. The proposed approach eliminates the need of additional pre-charging circuitry and thus the circuit become compact and cost-effective. Unlike conventional IBC, voltage stress across active switches are reduced and thus lower voltage rating MOSFETs can be used which reduce both switching and conduction losses. The features, principle of operation, analysis and design are presented in this paper. Simulation results of proposed converter topology are presented to justify the theoretical analysis.