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

Jia Yao,Kewei Li,Alexander Abramovitz,Kaisheng Zheng

doi:10.3390/en12244806

Jia Yao, Kewei Li + Show 2 more

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https://doi.org/10.3390/en12244806

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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.

Highlights

Renewable energy applications, such as solar and fuel cell-based energy generation systems produce low DC voltage that has to be stepped up significantly to match the grid level
The switch voltage stress in Tapped Inductor (TI) converters is further aggravated by the leakage inductance discharge
A benchmark Switched Inductor Buck-Boost (SIBB) and its equivalent TIBB were simulated in time domain

Summary

Introduction

Renewable energy applications, such as solar and fuel cell-based energy generation systems produce low DC voltage that has to be stepped up significantly to match the grid level. Inductor (TI) converters are a well-known class of converters and are quite popular for renewable energy applications that use a coupled magnetic device with several but, in most cases, just two windings [1,2,3] to attain higher gain. As compared to their uncoupled counterparts TI converters can attain wider conversion ratio by a proper choice of the turn ratio and winding polarity. Usually have a limited performance envelope, affect the converter’s conversion ratio, and complicate the converter’s design

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