A unified loss analysis framework for grid-based generalized switched-capacitor topologies

Abstract

Switched-capacitor converters (SCCs) are widely adopted in integrated circuits and increasingly used in data centers for their high power density and efficiency.Acomprehensive analysis and selection of SCC topologies for a given conversion ratio is essential for high-efficiency design. Although grid-based synthesis methods enable the generation of numerous novel topologies, evaluating their losses still relies heavily on time-consuming simulations. This is because traditional theoretical analysis methods cannot be applied to “underdetermined topologies”, as their charge multiplier vectors cannot be uniquely determined by conventional methods. In this paper, we propose the dual-limit asymptotic current model and apply it to analyze underdetermined topologies, which constitute 96.61% of 4:1 SCC topologies. By constructing an analysis framework based on this model, we successfully achieved rapid analysis across the full topology space, with an analysis speed 235 times faster than the traditional parallel simulation. Theoretical analysis results were validated through simulations and prototype experiments, identifying several novel topologies that differ from conventional designs while demonstrating favorable efficiency under the evaluated parameter set.