Abstract -- In this paper, a novel approach for multi-phase
interleaved LLC resonant converter is presented. The proposed
solution, based on the use of three LLC modules with star
connection of transformer primary windings, allows a drastic
reduction of the output current ripple and consequently of the
output filter capacitor size. Differently from other multi-phase
solutions, that are greatly susceptible to resonant
components’ tolerance causing current imbalance, the proposed
topology exhibits an inherent current sharing capability.
Moreover, a closed-loop phase-shift control is introduced to
additionally compensate for current mismatch and completely
balance the current supplied by each module. The benefit of
such solution on the reduction of output current ripple and the
phase-shift control interaction and effect on load-step variations
are also investigated. Measurements on a prototype are added to
simulations as validation of the assertions and proposals.