Re-visiting naturally balanced average capacitor voltages in multilevel DC-DC converters

Reznikov, Boris; Galanina, Valentina; Polichshuk, Ruslan; Ruderman, Alex

doi:10.1109/cpe.2017.7915233

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The FCC topology has advantages, such as having a natural balancing property and being able to operate at higher voltages, cf. (Reznikov et al, 2017;Stala, 2010Stala, , 2016Wu and Narimani, 2017). It can be used both as an AC modulation and DC-DC power converter (Andersen et al, 2013;McGrath and Holmes, 2007;Ibrayeva et al, 2015;Watanabe et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

A simple analysis of flying capacitor converter

Kadyrov

Skrzypacz

Familiant

2018

COMPEL

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Purpose -The paper aims to emphasise how switched systems can be analysed with elementary techniques which require only undergraduatelevel linear algebra and differential equations. It is also emphasised how math software can become useful for simplifying analytic complications.Design/methodology/approach -The time domain voltage balance methodology is used for stability analysis. As for deriving formulas for the asymptotic average of both capacitor voltage and inductor current, a new simple analytic method is introduced.Findings -It was shown analytically that the time average of capacitor voltage converges to half of the source voltage. A formula for the time average of the current of the inductor is also computed. As a by-product it was discovered that the period of the current is half of the switching period. Numerical simulations are obtained to illustrate the accuracy of the results.Research limitations/implications -Higher dimensional generalisations could become a bit complicated as stability analysis of higher dimensional exponential matrices are not so easy to handle. On the other hand, the new discovery on the period of the current is more likely to give new insights in handling higher dimensional systems.Practical implications -Analytical formulas are exact and it helps in accurately modelling flying capacitor converts in practice.Originality/value -FCC is well studied in engineering society. However, not much is done in obtaining exact formulas using analysis. Also, math software is much used in computation of numerical results and obtaining simulations. In this paper, one more important aspect * S. Kadyrov, Faculty of Engineering and Natural Sciences, Suleyman Demirel University, of math software is emphasised, namely, use symbolic computations in analysis.

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