Two-Phase Interleaved Resonant Switched-Capacitor DC-DC Converter with Coupled Inductors and Custom LC Resonator

Abstract

This work explores the design and implementation of a hybrid-resonant switched-capacitor (SC) dc-dc converter based on the stacked-ladder architecture. A particular focus is on improving efficiency and power-density through the use of coupled magnetics and a merged LC resonant structure that can reduce overall size and power loss. A two-phase interleaved 3-to-1 converter is implemented with 97.1% efficiency for both a coupled inductor and an integrated LC resonator with output power up to around 180 W. A study of resonant tank configurations is presented along with loss modeling, coupling effects, and design strategies.