An Optimized Zero-Current, Zero-Voltage, and Three-Level DC–DC Converter

Abstract

In this article, an optimized zero-voltage and zero-current pulsewidth modulation converter is proposed by investigating conventional converters widely used in dc grids. In this presented model, instead of using three-phase power switches, single-power switches are employed since single-power MOSFETs and IGBTs have lower switching loss and simpler drive circuit than the other module series. Therefore, the converter size and its power loss will decrease compared with the models with three-phase components. In addition, soft switching is utilized in the proposed converter to decrease the total power loss and increase efficiency accordingly. Also, for optimum use of zero-voltage switching (ZVS) and zero-current switching (ZCS), a new combination of IGBT and MOSFET is presented in the converter's circuit. Considering low turn-off loss for IGBT and low capacitive loss for MOSFET, IGBT and MOSFET are taken for ZVS switching and ZCS switching, respectively. In addition, a simple stabilizer circuit is added to the output part to improve the operation of the output filter since the filter plays an essential role in dc-dc converters. Finally, simulation of the proposed model is implemented in the PLECS software, and the results confirm the proper application of ZVS and ZCS, converter high efficiency, and high stability at the output voltage.