In this paper, a novel auxiliary circuit is introduced for the synchronous buck converter. This auxiliary circuit provides zero-current, zero-voltage switching conditions for the main and synchronous switches while providing zero-current condition for the auxiliary switch and diodes. The proposed active auxiliary circuit integrated with synchronous buck converter that emanates to zero-voltage transition (ZVT)-zero-current transition (ZCT) pulse width-modulated (PWM) synchronous buck converter is analyzed, and its operating modes are presented. The additional voltage and current stresses on main, synchronous and auxiliary switches get decimated because of the resonance of the auxiliary circuit that acts for a small segment of time in the proposed converter. The important design feature of soft-switching converters is the placement of resonant components that mollifies the switching and conduction losses. With the advent of ZVT-ZCT switching, there is an increase in the switching frequency that declines the resonant component values in the converters and also constricts the switching losses. The characteristics of the proposed converter are verified with the simulation in the Power Sim (PSIM) software co-simulated with MATLAB/SIMULINK environment and implemented experimentally.
In this study, a zero voltage transition (ZVT)-zero current transition (ZCT) 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-ZCT PWM multiphase SBC converters is the placement of resonant components that pacifies the switching and conduction losses. Due to the ZVT-ZCT, the resonant components with low values are used that results in the increase of switching frequency. High current multiphase buck converters found applications in the advanced data control, solid state lasers, communication equipment, Pentium processors etc. The ZVT-ZCT operation of the proposed converter is presented through theoretical analysis. A simple design method for the auxiliary circuit is discussed. The characteristics of the proposed converter are verified with the simulation in the PSIM co-simulated with MATLAB/SIMULINK environment and validated with experimental results.
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