Abstract
Hybrid-resonant switched-capacitor (SC) converters have gained traction as a way to increase efficiency and power density in high conversion ratio dc–dc applications. However, there is still room to improve passive component utilization and performance by exploiting resonant behavior and the unique circuit networks in hybrid topologies. This article explores a nominally 3:1 step-down resonant SC dc–dc converter that uses a high- $Q$ multiphase $LC$ resonator. The resonator combines flying capacitors and inductor(s) into a single component, leveraging advantages of each to improve the performance (efficiency and power density) of the overall structure. A hardware prototype is presented that achieves over 97% efficiency at >100 W in a 48-V:16-V step-down configuration. The prototype is used to highlight an interesting direction for future research in intermediate-bus converters for data center applications.
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