Multicell converters: active control and observation of flying-capacitor voltages

Gateau, Guillaume; Fadel, Maurice; Maussion, Pascal; Bensaid, R.; Meynard, Thierry

doi:10.1109/tie.2002.803200

Cited by 176 publications

(75 citation statements)

References 8 publications

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“…Therefore, the simulation and experimental results are in good agreement, and the inductor current ripple design is confirmed. However, the potential for an unbalanced flying capacitor voltage must be considered for the stable operation of the converter (11) (18)- (20) .…”

Section: Resultsmentioning

confidence: 99%

Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance

et al. 2014

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The purpose of the present paper is to analyze the input inductor design and to establish the relationship between the capacitance of the flying capacitor and the output voltage ripple in order to reduce the size and weight of the flying capacitor DC-DC boost converter (FCBC). The inductance of the input inductor is designed by considering the maximum input current ripple, and the experimental results are used to confirm that the input current ripple is within the designed value. Furthermore, according to the design specifications, the required inductance of an input inductor is approximately 25% of that of a conventional two-level DC-DC boost converter, and the required inductor core volume is approximately 35% of that of a conventional two-level DC-DC boost converter. Moreover, the capacitance of the flying capacitor and the output voltage ripple are confirmed to be independent of each other. Theoretically, this is because the time constant of the output capacitance and the output resistance of the FCBC is larger than the switching period of the switching frequency. This finding is confirmed by the simulation and experimental results of the present study. On the basis of this finding, the capacitance of the flying capacitor can be estimated and designed without considering the output voltage ripple. Moreover, the achieved maximum efficiency of the designed FCBC is 98.5% of the output power at 1 kW.

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Section: Resultsmentioning

confidence: 99%

Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance

et al. 2014

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“…Another solution is the use of multilevel DC/DC converters. However, the number of additional clamping diodes and flying capacitors increases, and the associate control becomes more complex as the number of levels increases [5]- [7]. A third option is the use of input-series connected converters.…”

Section: Introductionmentioning

confidence: 99%

Input-Series Multiple-Output Auxiliary Power Supply Scheme Based on Transformer-Integration for High-Input-Voltage Applications

Tao¹,

Ben²,

Wei³

2012

Journal of Power Electronics

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In this paper, an input-series auxiliary power supply scheme is proposed, which is suitable for high input voltage and multiple-output applications. The power supply scheme is based on a two-transistor forward topology, all of the series modules have a common duty ratio, all the switches are turned on and off simultaneously, and the whole circuit has a single power transformer. It does not require an additional controller but still achieves efficient input voltage sharing (IVS) for each series module through its inherent transformer-integration strategy. The IVS process of this power supply scheme is analyzed in detail and the design considerations for the related parameters are given. Finally, a 100W multiple-output auxiliary power supply prototype is built, and the experimental results verify the feasibility of the proposed scheme and the validity of the theoretical analysis.

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“…Other solutions based on input-output linearization control can be L. Amet, M. Ghanes and J-P. Barbot are with ECS-Lab EN-SEA of Cergy Pontoise France, {Leonardo.Amet, Ghanes, Barbot}@ensea.fr J-P. Barbot is also with the EPI-ALIEN-INRIA. found in [6]. However, although the dynamics of rebalancing are really improved, they may still be too slow to follow fast variations of the input voltage and they are not very robust against load variations.…”

Section: Introductionmentioning

confidence: 99%

Direct control based on sliding mode techniques for multicell serial chopper

Amet

Ghanes

Barbot

2011

Proceedings of the 2011 American Control Conference

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Abstract-Series multi-cell converters introduced more than ten years ago provide many degrees of freedom like the possibility to distribute the voltage constraints among series-connected switches and to improve the output waveforms. Direct control laws make perfect use of them during transient behaviors, but leads to disorderly and imperfect steady-state operations. This paper deals with some solutions for the direct control of the voltages across the flying capacitors in the presence of fast variation of the input voltage by reach an optimal steady-state trajectory defined by the PWM control technique.

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Multicell converters: active control and observation of flying-capacitor voltages

Cited by 176 publications

References 8 publications

Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance

Size Reduction of DC-DC Converter using Flying Capacitor Topology with Small Capacitance

Input-Series Multiple-Output Auxiliary Power Supply Scheme Based on Transformer-Integration for High-Input-Voltage Applications

Direct control based on sliding mode techniques for multicell serial chopper

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