A simple passive auxiliary circuit for reduction of losses and efficiency enhancement of synchronous buck converter

In this paper, a Zero-Voltage-Transition (ZVT) Pulsewidth Modulated (PWM) synchronous buck converter (SBC), with a simple passive auxiliary circuit is proposed, which reduces the stresses and improves the efficiency by pacifying the conduction losses compared to a traditional PWM converter, typically suitable for photovoltaic applications. The important design feature of ZVT-PWM SBC converters is placement of resonant components that mollifies the conduction losses. Due to the ZVT, the resonant components with low values are used thereby resulting in the increase of switching frequency. The zero-voltage-transition operation of the proposed converter is presented through theoretical analysis. The characteristics of the proposed converter are verified with the simulation in the PSIM cosimulated with MATLAB/SIMULINK environment.