On the Equivalence of the Switched Inductor and the Tapped Inductor Converters and its Application to Small Signal Modelling

Jia Yao, Kewei Li, Kaisheng Zheng and Alexander Abramovitz
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Jia Yao: Department of Electrical Engineering, School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Kewei Li: Department of Electrical Engineering, School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Kaisheng Zheng: Department of Electrical Engineering, School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
Alexander Abramovitz: Faculty of Engineering, Holon Institute of Technology, Holon 5810201, Israel

Energies, 2019, vol. 12, issue 24, 1-19

Abstract: Switched inductor (SI) converters are popular in applications requiring a steeper conversion ratio. However, these converters operate a twin inductor switching cell, which complicates the small-signal modeling. This paper proposes an expeditious small-signal analysis method to model the SI converters. The offered modeling approach is hinged on the analogy existing between the SI converters and certain Tapped Inductor (TI) converters. It is suggested here that by virtue of the analogy of the SI converters and TI converters the small-signal model of the SI converter is identical to that of its ideal TI counterpart. Hence, the recently developed Tapped Inductor Switcher (TIS) methodology can be applied to the modeling of the SI converters as well. As an example, the small-signal model of the Switched Inductor Buck converter is obtained. Theoretical analysis was confirmed by simulation and experimental results. In addition, several other SI converters and their TI counterparts are identified.

Keywords: high order dc/dc converter; unified modeling cell; switched inductor; tapped inductor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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