In server AI application one of the biggest bottlenecks to keep up calculation capability is power management, hence high power density and high efficiency power supply are required. 48 V power-delivery architecture has been promoted to replace the 12 V power supply [1] where a two-stage approach is commonly adopted. First stage is typically implemented with an unregulated converter such as LLC or STC [2]. LLC converters with matrix transformer are suitable for these applications, however, where isolation is not needed a non-isolated resonant hybrid switched capacitor converter is a valuable candidate. In this paper a novel magnetic structure called matrix multi-tapped autotransformer is presented. This structure combines the benefit of matrix transformer with the advantages of hybrid switched capacitor structure. Experimental results for a 450 W prototype in 8th brick ultra-low profile factor achieving 1300 W/in3 power density, are proving the effectiveness of the proposed approach.
