Geometrical State-Plane Analysis of Resonant Switched-Capacitor Converters: Demonstration on the Cascaded Multi-Resonant Converter

To realize high efficiency and power density for resonant switched capacitor (ReSC) converters, it is critical to have a thorough understanding of the soft-switching mechanism design converter appropriately. However, this can be challenging as operation depends on multiple variables its difficulty increases quickly with respect topology complexity. This paper demonstrates framework using geometrical state-plane analysis facilitate ReSC design. The methodology first applied basic 2-to-1 converter, then extended new 4-to-1 we proposed, herein named cascaded multi-resonant converter. has reduced component count thanks “switching bus” architecture. comes at cost resonances within each switching cycle, complicating Despite circuit complexity, neatly provides analytical equations all state parameters, which are verified by simulations experiments. Our hardware prototype achieves 6000 W/in 3 48-to-12 V conversion 80 A continuous output. Its peak reaches 99.02%, full-load 97.67%, including gate drive loss. Both superior state-of-the-art solutions.