An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode

Lingling Zhao; Min Sun; Siming Pan; Weihao Hu; Frede Blaabjerg

doi:10.1109/ECCE53617.2023.10361981

An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode

Lingling Zhao, Min Sun, Siming Pan, Weihao Hu, Frede Blaabjerg

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

Abstract

Series capacitor buck converter (SCBC) in DCM is a unique solution for the 48 V power supply system. The converter has the merits of high step-down ratio, low current ripple and voltage stress, self-sharing current. However, two problems were revealed in this paper through the analysis of multi-phase SCBC in light load condition: the self-current sharing can only realize in a limited region of 1 < D ≤ 1/M, the negative current conduction will be generated in a very low current situation. Through discussing the causes of the unbalanced current and the negative current conduction, an edge-connected phase shift modulation method is introduced to solve above defects. Without any addition devices, the self-sharing current operating region is extended to 0 < D ≤ 1/2, and the negative current is eliminated. By applying the proposed method, the phase current can be balanced which has the same slope and duration, the same peak-to-peak current. And the negative current is eliminated, which conforms to the operating conditions of 48 V power supply system. Experimental results from a 3-phase SCBC prototype validate the correctness of proposed method with an improved efficiency of 98.6%.

Original language	English
Title of host publication	IEEE Energy Conversion Congress and Exposition, ECCE
Number of pages	8
Publisher	IEEE Press
Publication date	Oct 2023
Pages	2174-2181
Article number	10361981
ISBN (Print)	979-8-3503-1645-2
ISBN (Electronic)	979-8-3503-1644-5, 979-8-3503-1643-8
DOIs	https://doi.org/10.1109/ECCE53617.2023.10361981
Publication status	Published - Oct 2023
Event	2023 IEEE Energy Conversion Congress and Exposition (ECCE) - Nashville, United States Duration: 29 Oct 2023 → 2 Nov 2023 https://www.ieee-ecce.org/2023/

Conference

Conference	2023 IEEE Energy Conversion Congress and Exposition (ECCE)
Country/Territory	United States
City	Nashville
Period	29/10/2023 → 02/11/2023
Internet address	https://www.ieee-ecce.org/2023/

Series	IEEE Energy Conversion Congress and Exposition (ECCE)
ISSN	2329-3748

Keywords

series capacitor buck converter
discontinuous conduction mode (DCM)
high step-down ratio
self-sharing current
interleaved buck converter (IBC)

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10.1109/ECCE53617.2023.10361981

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Cite this

@inproceedings{d7fe082d8ba74cd5a38a86767b9fe729,

title = "An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode",

abstract = "Series capacitor buck converter (SCBC) in DCM is a unique solution for the 48 V power supply system. The converter has the merits of high step-down ratio, low current ripple and voltage stress, self-sharing current. However, two problems were revealed in this paper through the analysis of multi-phase SCBC in light load condition: the self-current sharing can only realize in a limited region of 1 < D ≤ 1/M, the negative current conduction will be generated in a very low current situation. Through discussing the causes of the unbalanced current and the negative current conduction, an edge-connected phase shift modulation method is introduced to solve above defects. Without any addition devices, the self-sharing current operating region is extended to 0 < D ≤ 1/2, and the negative current is eliminated. By applying the proposed method, the phase current can be balanced which has the same slope and duration, the same peak-to-peak current. And the negative current is eliminated, which conforms to the operating conditions of 48 V power supply system. Experimental results from a 3-phase SCBC prototype validate the correctness of proposed method with an improved efficiency of 98.6%.",

keywords = "series capacitor buck converter, discontinuous conduction mode (DCM), high step-down ratio, self-sharing current, interleaved buck converter (IBC)",

author = "Lingling Zhao and Min Sun and Siming Pan and Weihao Hu and Frede Blaabjerg",

year = "2023",

month = oct,

doi = "10.1109/ECCE53617.2023.10361981",

language = "English",

isbn = "979-8-3503-1645-2",

series = "IEEE Energy Conversion Congress and Exposition (ECCE)",

pages = "2174--2181",

booktitle = "IEEE Energy Conversion Congress and Exposition, ECCE",

publisher = "IEEE Press",

note = "2023 IEEE Energy Conversion Congress and Exposition (ECCE) ; Conference date: 29-10-2023 Through 02-11-2023",

url = "https://www.ieee-ecce.org/2023/",

}

Zhao, L, Sun, M, Pan, S, Hu, W & Blaabjerg, F 2023, An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode. in IEEE Energy Conversion Congress and Exposition, ECCE., 10361981, IEEE Press, IEEE Energy Conversion Congress and Exposition (ECCE), pp. 2174-2181, 2023 IEEE Energy Conversion Congress and Exposition (ECCE), Nashville, Tennessee, United States, 29/10/2023. https://doi.org/10.1109/ECCE53617.2023.10361981

An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode. / Zhao, Lingling; Sun, Min; Pan, Siming et al.
IEEE Energy Conversion Congress and Exposition, ECCE. IEEE Press, 2023. p. 2174-2181 10361981 (IEEE Energy Conversion Congress and Exposition (ECCE)).

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

TY - GEN

T1 - An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode

AU - Zhao, Lingling

AU - Sun, Min

AU - Pan, Siming

AU - Hu, Weihao

AU - Blaabjerg, Frede

PY - 2023/10

Y1 - 2023/10

N2 - Series capacitor buck converter (SCBC) in DCM is a unique solution for the 48 V power supply system. The converter has the merits of high step-down ratio, low current ripple and voltage stress, self-sharing current. However, two problems were revealed in this paper through the analysis of multi-phase SCBC in light load condition: the self-current sharing can only realize in a limited region of 1 < D ≤ 1/M, the negative current conduction will be generated in a very low current situation. Through discussing the causes of the unbalanced current and the negative current conduction, an edge-connected phase shift modulation method is introduced to solve above defects. Without any addition devices, the self-sharing current operating region is extended to 0 < D ≤ 1/2, and the negative current is eliminated. By applying the proposed method, the phase current can be balanced which has the same slope and duration, the same peak-to-peak current. And the negative current is eliminated, which conforms to the operating conditions of 48 V power supply system. Experimental results from a 3-phase SCBC prototype validate the correctness of proposed method with an improved efficiency of 98.6%.

AB - Series capacitor buck converter (SCBC) in DCM is a unique solution for the 48 V power supply system. The converter has the merits of high step-down ratio, low current ripple and voltage stress, self-sharing current. However, two problems were revealed in this paper through the analysis of multi-phase SCBC in light load condition: the self-current sharing can only realize in a limited region of 1 < D ≤ 1/M, the negative current conduction will be generated in a very low current situation. Through discussing the causes of the unbalanced current and the negative current conduction, an edge-connected phase shift modulation method is introduced to solve above defects. Without any addition devices, the self-sharing current operating region is extended to 0 < D ≤ 1/2, and the negative current is eliminated. By applying the proposed method, the phase current can be balanced which has the same slope and duration, the same peak-to-peak current. And the negative current is eliminated, which conforms to the operating conditions of 48 V power supply system. Experimental results from a 3-phase SCBC prototype validate the correctness of proposed method with an improved efficiency of 98.6%.

KW - series capacitor buck converter

KW - discontinuous conduction mode (DCM)

KW - high step-down ratio

KW - self-sharing current

KW - interleaved buck converter (IBC)

U2 - 10.1109/ECCE53617.2023.10361981

DO - 10.1109/ECCE53617.2023.10361981

M3 - Article in proceeding

SN - 979-8-3503-1645-2

T3 - IEEE Energy Conversion Congress and Exposition (ECCE)

SP - 2174

EP - 2181

BT - IEEE Energy Conversion Congress and Exposition, ECCE

PB - IEEE Press

T2 - 2023 IEEE Energy Conversion Congress and Exposition (ECCE)

Y2 - 29 October 2023 through 2 November 2023

ER -

An Improved modulation method to Series Capacitor Buck Converter in Discontinuous Conduction Mode

Abstract

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Keywords

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