一种电源-电容串联型直流变换器

提出了一种电源-电容串联型直流变换器,这种拓扑结构可以同时为两路直流电源升压,并且有效降低了半导体器件的电压与电流应力。与双路Boost型直流变换器相比,该电源-电容串联型直流变换器在不增加功率器件数量的前提下,显著降低了半导体器件的电压与电流应力,适用于分布式光伏并网逆变器的直流变换级。主要涉及该直流变换器的运行方式、电压与电流应力分析、效率对比,并通过实验验证了该直流变换器的可行性。

A Source-Capacitor Serial Type DC/DC Converter

This paper proposes a central capacitor serial type DC/DC converter, which can be used to boost dual input sources to a desired output voltage with reduced semiconductor voltage stress and current stress. Compared to the traditional DC/DC boost converter, the proposed circuit reduces both voltage and current stresses for switches and diodes without adding extra devices. The proposed circuit is suitable for distributed photovoltaic (PV) inverter, where the traditional first-stage boost converters can be replaced by the proposed circuit to increase efficiency. The key issues regarding operational principle, voltage and current stress analysis, efficiency comparison are discussed in this paper either. Finally, the proposed converter is verified through a laboratory prototype.