Signal flow graph modelling of a switching converter with single inductor triple output DC–DC structure

Abbasi, Majid; Afifi, Ahmad; Pahlavani, Mohammad Reza Alizadeh

doi:10.1049/iet-pel.2017.0289

Cited by 8 publications

(7 citation statements)

References 31 publications

(39 reference statements)

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“…The conventional state‐space averaged model, as a simple, yet powerful approach, has been widely adopted to explore the dynamical behavior of SISO converters 15,16 . Of course, the state‐space averaged model can be applied to MPCs as well 17–19 . Xiong et al derived an averaged model to analyze smooth and nonsmooth bifurcation of the dual‐input Buck converters 20 .…”

Section: Introductionmentioning

confidence: 99%

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Modeling and stability analysis of dynamic oscillation behaviors in double‐input Buck/Buck‐Boost DC‐DC converters using frequency selective approach

Zhang

Liu

Ding

et al. 2020

Circuit Theory & Apps

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Different from single-input single-output converters, stronger nonlinearity and coupling effect become ones of the most salient characteristics in the multiport DC-DC converters (MPCs). Therefore, the MPCs can exhibit a great variety of more complex oscillation behaviors in different frequency regimes and seriously endanger system stability. In this paper, a frequency-selective averaging model is proposed to investigate the low-and high-frequency stability problem in the double-input Buck/Buck-Boost DC-DC converter. At first, to characterize both low-and high-frequency regime dynamics in one unified frame, the short-time Fourier transform will be applied to obtain a frequency-selective averaging model. Based on the proposed model, theoretical analysis is performed to identify subharmonic oscillation and low-frequency oscillation by the movement of the eigenvalue loci. In particular, the underlying mechanism of the subharmonic oscillation and low-frequency oscillation is uncovered deeply by participation analysis. It shows that period-doubling bifurcation and Hopf bifurcation result in the subharmonic oscillation and low-frequency oscillation, respectively. Moreover, some stability boundaries show the influence of varying parameters on system stability thoroughly, which is important to guide system stability enhancement. Finally, some circuit experiments are presented to verify the above theoretical and numerical results. K E Y W O R D S double-input dc-dc converter, dynamic stability, frequency-selective modeling, oscillation behaviors 1 | INTRODUCTION With the rapid development of the hybrid renewable energy systems, 1,2 a number of single-input single-output (SISO) converters have been used to interface various energy sources including solar energy, wind energy, and even storage unit, which leads to increasing the cost and degrading the system reliability. 3,4 Due to some considerable advantages of the integrated circuit topology, centralized control, and low-manufacturing cost and size, multiport converters (MPCs) have attracted wide attention in the past few years. 5-7 Since the MPCs are required to deliver multiple input power from

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Section: Introductionmentioning

confidence: 99%

“…15,16 Of course, the state-space averaged model can be applied to MPCs as well. [17][18][19] Xiong et al derived an averaged model to analyze smooth and nonsmooth bifurcation of the dual-input Buck converters. 20 Based on the averaged model, Font et al investigated the low-frequency oscillation in a single-inductor two-input two-output DC-DC converter.…”

mentioning

confidence: 99%

Modeling and stability analysis of dynamic oscillation behaviors in double‐input Buck/Buck‐Boost DC‐DC converters using frequency selective approach

Zhang

Liu

Ding

et al. 2020

Circuit Theory & Apps

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“…When the normalised ripple of inductor current is >40%, the SFG modelling cannot predict the converter behaviour of system correctly [22]. In some structures such as single-inductor multioutput (SIMO) [23][24][25] converters, the ripple information is the driving factor to analyse the converter.…”

Section: Introductionmentioning

confidence: 99%

“…Applying the Mason's rule, the desired transfer function can be achieved. Also, the parasitic elements can be considered in modelling without increasing the mathematical manipulations [22].…”

Section: Introductionmentioning

confidence: 99%

Ripple base signal flow graph modelling of DC–DC switching converters

Abbasi

Afifi

Pahlavani

2019

IET Power Electronics

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A new ripple base signal flow graph (R-SFG) modelling method was proposed to accurately model and analyse a family of switching DC-DC converter. The performance of some DC-DC converters such as single-inductor multi-output converters is dependent on inductor current ripples. This makes the conventional modelling methods cannot fully predict the overall behaviour of converter. From this family and in this study, a single-inductor dual-output (SIDO) boost/boost converter has been modelled based on proposed R-SFG method. The simplicity and systematic procedure presented in this work showed that the R-SFG could be a good alternative for modelling switching converter with complicated structures and with high inductor current ripple. In the new R-SFG method, the effects of inductor current ripple have been considered to develop the conventional signal flow graph modelling method. In this work, a comparative study between two modelling methods has been carried out in a SIDO converter. A step-by-step direct mathematical manipulation was used to calculate the DC-DC transfer function of SIDO converter. The experimental results were included to show the validity of the obtained models. The experimental results showed that the maximum R-SFG modelling error was about 5% over the wide range of inductor current ripple.

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“…Among the converters with triple bus outputs reported in the literature, [17] has isolated topology for two different DC sources and a load employing two high-frequency transformers and three power electronics converters with a total of 14 switches. In [18], a fundamental SIMO structure without an energy storage for three DC loads using four switches is reported. To employ an energy storage in the structure, additional switches are required.…”

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confidence: 99%

Time-Sharing Duty Cycle-Based Concurrent Control for a Triple-Output Converter With Energy Storage

Kim

Wang

2019

IEEE Access

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This paper presents a new concurrent control structure for a novel non-isolated triple-output converter with energy storage utilizing a time-sharing switching technique. The proposed structure and control feature single-stage power conversion for a DC input, energy storage, and three output ports while reducing the number of switching elements. To employ fewer switches and to have a continuous battery current, a new time-sharing switching method is proposed for two switches in the converter. Based on the proposed control method, the two switches can manage the main inductor current and a battery current concurrently, which in turn creates room to use fewer switching elements. Therefore, the proposed converter structure is compact but fully functional by integrating fundamental converters utilizing the new time-sharing control method. Various applications that have a single DC input and multiple DC outputs along with energy storage can benefit from the proposed structure and control strategies. The fundamentals of the proposed circuits and the concurrent control concept are explained in detail. Then, the feasibility of the proposed approach is validated both by experiments and by simulations.

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Signal flow graph modelling of a switching converter with single inductor triple output DC–DC structure

Cited by 8 publications

References 31 publications

Modeling and stability analysis of dynamic oscillation behaviors in double‐input Buck/Buck‐Boost DC‐DC converters using frequency selective approach

Modeling and stability analysis of dynamic oscillation behaviors in double‐input Buck/Buck‐Boost DC‐DC converters using frequency selective approach

Ripple base signal flow graph modelling of DC–DC switching converters

Time-Sharing Duty Cycle-Based Concurrent Control for a Triple-Output Converter With Energy Storage

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