This paper aims to establish the foundation for miniaturizing EV chargers by integrating stray capacitances into the LLC-LC resonant converter operation. Capacitors are an indispensable part of power electronics converters that are widely employed in electric vehicle (EV) chargers. They are, however, particularly prone to wear-out mechanisms and failure modes, contributing to increased monitoring and replacement costs for these systems. Traditionally, stray capacitance in power electronics has been perceived as unavoidable and undesirable. However, this paper challenges this conventional view by advocating for the integration of stray capacitance as intrinsic components within the system’s topology, particularly in LLC-LC resonant converters utilizing the notch resonant converter on their secondary side. To validate the proposed concepts, we have conducted finite element analysis, supported by both system simulation and experimental results. The proposed LC notch resonant converter, with L_p=539.97 uH and C_p=9.09 uF, showed good agreement between simulation data and the mathematical model detailed in the paper, thus validating the proposed design.
