A Unified Electromagnetically Integrated LC and LCL Filtering Module With Flexible Configurations for Single-Phase Voltage-Source Converters

Compared to the traditional magnetic integration technique, the emerging electromagnetic integration technique (EMIT) has a greater potential for compact design of power converters since it has the capacity to integrate both inductive and capacitive components. As the most representative method, the flexible multilayer foil (FMLF) technique still needs to be further studied for extending and promoting its applications. In this paper, the FMLF technique is utilized to improve harmonic filter design for single-phase voltage-source power converters, a unified integrated LC and LCL filtering module is proposed. In this design, two symmetrical regular FMLF windings and EIE-shape magnetic cores are employed. By sharing the gapped EIE cores and properly arranging the windings with three-terminal configuration, the integrated module can flexibly serve as an LC or LCL filter and realize magnetic decoupling between the two inductors. Taking a 1-kW single-phase SiC-MOSFET converter as the application scenario, simulations and experiments have been conducted to reflect feasibility of the proposed approach.