Abstract
The rising power requirement of the on-board charger (OBC) demands high efficiency and high power density in the 3-phase power factor correction (PFC) converters. However, due to the large volume of boost inductors and filters of the conventional 2-level converters, their power density is limited. In this paper, multilevel inductive switching network (MISN) modules based on low-voltage switches are arranged in series at the ac-side to reduce the large size of inductors and filters. Besides, the operating principle and control strategy of the 3-phase MISN-PFC converter are analyzed. In addition, to determine the multiple variables of the MISN module, the design methodology is proposed based on the loss model and volume model for the multilevel converter. Finally, a 10kW prototype has been established to verify the analysis, where 99% efficiency at full load and 430W/in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> power density are achieved.
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