期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 9, 期 5, 页码 5929-5940出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2020.3026640
关键词
Capacitors; Switches; Impedance; Steady-state; Mathematical model; Resistance; Power electronics; DC-DC power converters; modeling; switched capacitor (SC) circuits
A precise curvature-based modeling technique for SC DC-DC converters is proposed in this study, providing comprehensive characterization across the full range of operating conditions. The accuracy of the model is validated through simulations and experimental measurements.
A precise, curvature-based, average modeling technique for switched-capacitor (SC) dc-dc converters is proposed. The generalized modeling technique provides a comprehensive characterization of the converter at steady-state, across the full range of practical operating conditions. An expression for the equivalent output impedance is obtained, which relates the slow- and fast-switching limit impedances to the total output impedance. This expression can be used to accurately compute the output voltage without deriving the converter's state equations and precisely weighs the contribution of each floating capacitor and parasitic resistance on the output impedance. The modeling technique is applied to a unity-gain SC converter, a multiphase binary converter, and a nonsymmetrical parallel-series converter, and the results are compared with existing steady-state models. The accuracy of the model is validated through simulations and experimental measurements.
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