Two-Phase LLC Converter with Common LC Branch for Inherent Current-Sharing and Phase-Shedding Ability

This paper presents a two-phase input-parallel output-parallel LLC resonant converter with a common inductor capacitor (LC) branch, such that current-sharing and phase-shedding capabilities are achieved. Thanks to the common LC branch, current-sharing is inherent, and phase-shedding can be performed with no influence in the operating point. With few passive components in the tank circuit and with a simple connection between the two-phases, it exhibits low-cost, high power density, and high light-load efficiency, with respect to the existing converters. A detailed analysis of the primary and the secondary side current-sharing is presented, which confirms improvements when compared to previous approaches. Simulation results of the proposed converter validate the analysis and illustrate the effectiveness of the current-sharing and phase-shedding capacities with a power rating of 500 W.