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This paper explores generalized output impedance models and develops a new performance-limit figure of merit (FOM) for switched-capacitor (SC) dc–dc converters that can be resonated or soft-charged with a single inductor. Compared to past work, the output impedance model is greatly simplified through a two-port charge multiplier treatment, yet it maintains accuracy across conversion ratios and is...
Resonant switched capacitor dc-dc converter designs are commonly optimized based on flying capacitance constraints. However, for an actual circuit design, the total available capacitance is further constrained by the need for bypass capacitance at the input and output nodes. This work finds expressions for the voltage ripple and develops a method to optimize the allocation of bypass capacitance so...
This work explores the well-known challenge of achieving voltage balance of capacitors in arbitrary (N-level) flying capacitor multilevel (FCML) converters. In particular, we explore the relationships among measurable circuit waveforms and flying capacitor voltage ‘states’. These are used to derive a set of sufficient conditions that ensure balance of the median capacitor voltage levels. It is shown...
Multi-level hybrid converters have been shown to be a promising class of DC-DC converters. One member of this class is the Flying Capacitor Multilevel (FCML) Converter, which is explored in this work. The multi-mode approach is discussed as a tool to affect high efficiency and power-density across a wide load range, provide variable regulation, and as a general framework to conceptualize the advantages...
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