Multiphase Fibonacci Switched Capacitor Converters

Kushnerov, Alexander

doi:10.1109/jestpe.2013.2279871

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…Note that, the model in (7) assumes that the output voltage of the negator stage equals −v in . Nevertheless, this voltage can be slightly less due to the conduction and switching losses of the negator stage.…”

Section: Proposed Designmentioning

confidence: 99%

“…Considering the way it is synthesized, SCC can be categorized into two main groups: topological and non-topological converters. The topological SCC is synthesized in a systematic way based on well-established structures such as the Dickson charge pump, series-parallel (SPSC), Fibonacci (FSC), exponential charge pump and binary SCC [4]- [7]. On the other hand, the switch network and the flying capacitors in the non-topological SCC are structured on an ad hoc way [8].…”

Section: Introductionmentioning

confidence: 99%

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A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

Mahnashi

2023

IEEE Trans. Circuits Syst. II

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This paper provides a simple yet novel structure to achieve voltage conversion ratio (VCR) that exceeds the theoretical attainable VCR of topological switched-capacitor DC-DC converters (SCC). Typically, the SCC terminals are connected to the input voltage, the output voltage, or the ground reference. The proposed structure in this paper utilizes the ground-connected terminals and instead connecting them to negative input voltage provided by a negator stage. Here, two types of SCC are used as case studies: Series-parallel (SPSC) and Fibonacci (FSC). The model for the proposed structure is constructed and verified experimentally using 3-stage SPSC and FSC. The experimental results are in good agreement with the proposed model with an error of less than 5% in all cases. The VCR obtained from the proposed structure exceeds the theoretical limits of conventional topological structures.Index Terms-Switched-capacitor converter (SCC), high-gain DC-DC converters, series-parallel (SPSC), Fibonacci switchedcapacitor converters (FSC), and voltage conversion ratio (VCR).

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Section: Proposed Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

Mahnashi

2023

IEEE Trans. Circuits Syst. II

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“…A proof must involve calculation of SCC internal losses. The approach of [4], [5] suggests first finding charges flowing through each switched capacitor on switching intervals. For 978-1-5386-4198-9/18/$31.00 ©2018 IEEE 188 that, a set of linear equations must be generated based on: 1) steady-state conditions -a net charge of a switched capacitor must be zero on a switching period; 2) Kirchhoff current law for series-parallel switched capacitor connections.…”

Section: The Relationship Between Equivalent Resistances Of Complmentioning

confidence: 99%

“…that means balanced multiphase switching ( [6], [7]). Three equal charges (2) are spread over switching intervals with their respective time constants ([4], [5]) according to equivalent first order RC-circuits ( Fig. 6; output voltage is assumed pure DC; switched capacitances C 1 = C 2 = C)…”

Section: Fibonacci Scc With Multiphase Switchingmentioning

confidence: 99%

SCC Equivalent Resistance: The Relationship for Complementary Buck and Boost and Accurate Calculation for 2-Phase Converters

Mustafa

Zhaikhan

Ruderman

2018

2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)

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This paper makes the following contributions to Switched Capacitor Converter (SCC) equivalent (output) resistance analysis. First, it suggests the relationship between equivalent resistances of complementary buck and boost SCC: equivalent resistance of a boost SCC equals that of its buck counterpart times squared boost voltage Target Ratio (Voltage Conversion Ratio). Another contribution is equivalent resistance accurate calculation methodology for an arbitrary 2-phase SCC.

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“…For transformerless DC-DC converters, a few techniques to improve the step-down capability are named: tapped/coupledinductor [12], switched-inductor [13], ladder switchedcapacitor [14], fibonacci switched-capacitor [15], Dickson switched-capacitor [16] and Valley-Fill switched-capacitor [17]. This paper will focus on the application of a Valley-Fill switched capacitor technique to improve the step-down ratio of the converter proposed in [18].…”

Section: Introductionmentioning

confidence: 99%

A Family of DC–DC Converters With High Step-Down Voltage Capability Based on the Valley-Fill Switched Capacitor Principle

Vecchia

Broeck

Ravyts

et al. 2021

IEEE Trans. Ind. Electron.

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In this paper, a family of interleaved high-stepdown (I-HSD) DC-DC converters is proposed integrating the Valley-Fill switched capacitor structure and a double series capacitor Buck converter. This integration generates three converters, which will be extensively explored herein via theoretical and experimental analysis. A complete theoretical analysis of the structures is presented in order to mathematically explain the physical operation of the proposed topologies. A design procedure is presented for the following specifications: 300 V/12 V input to output voltage, 100 W of power and a switching frequency of 100 kHz and the results obtained are compared to state-of-theart DC-DC converters that enable similar high step-down operation.

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Multiphase Fibonacci Switched Capacitor Converters

Cited by 17 publications

References 11 publications

A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

A New Approach to Improve the Voltage Conversion Ratio in Topological Switched-Capacitor DC–DC Converters Using Negator Stage

SCC Equivalent Resistance: The Relationship for Complementary Buck and Boost and Accurate Calculation for 2-Phase Converters

A Family of DC–DC Converters With High Step-Down Voltage Capability Based on the Valley-Fill Switched Capacitor Principle

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