A ZVT-PWM multiphase synchronous buck converter with an active auxiliary circuit for portable applications

In this paper, a Zero-Voltage-Transition (ZVT) Pulse-width Modulated (PWM) multiphase synchronous buck converter (SBC), with an active auxiliary circuit is proposed, that reduces the stresses and enhances the efficiency abating the switching and conduction losses of the converter. The important design feature of ZVT-PWM multiphase SBC converters is placement of resonant components that pacifies the switching and conduction losses. Due to the ZVT, the resonant components with low values are used that results in the increase of switching frequency. High current multiphase buck converters found applications in advanced data control, portable applications and other applications like computer processors. 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.