Reduction of Losses and Efficiency Enhancement of a Zero-voltage Transition–Zero-current Transition Pulse-width Modulated Synchronous Buck Converter with a Simple Passive Auxiliary Circuit

Abstract

In this article, a novel auxiliary circuit is incorporated with a synchronous buck converter, which provides zero-voltage transition–zero-current transition switching conditions for the main and synchronous switches in the proposed converter. There are no additional voltage and current stress on main and synchronous switches due to the resonance of the auxiliary circuit that acts for a small segment of time in the proposed converter. A zero-voltage transition–zero-current transition pulse-width modulated synchronous buck converter with a simple passive auxiliary circuit reduces the stress and improves the efficiency by pacifying the conduction and switching losses compared to a traditional converter. The important design feature of the zero-voltage transition zero-current transition pulse-width modulated synchronous buck converter is the placement of resonant components that mollify the conduction and switching losses. Due to the zero-voltage transition–zero-current transition, the resonant components with low values are used, thereby resulting in the increase of switching frequency. The zero-voltage transition–zero-current transition operation of the proposed converter is presented through theoretical analysis. The characteristics of the proposed converter are verified with simulation in the PSIM (Powersim Inc, Rockville, USA) co-simulated with a MATLAB/SIMULINK (The Math Works, Natick, Massachusetts, USA) environment and implemented experimentally.