Stability Issue of Cascaded Systems with Consideration of Switching Ripple Interaction

Xin Li; Xinbo Ruan; Xiaoling Xiong; Qian Jin; Chi K. Tse

doi:10.1109/TPEL.2018.2876627

Stability Issue of Cascaded Systems with Consideration of Switching Ripple Interaction

Xin Li, Xinbo Ruan^*, Xiaoling Xiong, Qian Jin, Chi K. Tse

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

27 Citations (Scopus)

Abstract

Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that the switching ripple interaction (SRI) between the source converter and the load converter in a cascaded system would change the gain of the pulsewidth modulation of the source converter, causing the cut-off frequency and the phase margin of the source converter to change accordingly. Thus, even if a cascaded system is shown to be stable under an impedance-based criterion, it can, in fact, be unstable due to the SRI. This paper proposes an adaptive modulation sample-and-hold method for eliminating the effect of the SRI. A 48 V-12 V-5 V cascaded system consisting of two buck converters is tested for verification.

Original language	English
Article number	8494812
Pages (from-to)	7040-7052
Journal	IEEE Transactions on Power Electronics
Volume	34
Issue number	7
Online published	16 Oct 2018
DOIs	https://doi.org/10.1109/TPEL.2018.2876627
Publication status	Published - Jul 2019
Externally published	Yes

Research Keywords

Adaptive
Cascaded system
Sample-and-hold, stability issue
Switching ripple interaction (SRI)

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10.1109/TPEL.2018.2876627

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@article{1176563ce9ce4922b529c70197ab349e,

title = "Stability Issue of Cascaded Systems with Consideration of Switching Ripple Interaction",

abstract = "Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that the switching ripple interaction (SRI) between the source converter and the load converter in a cascaded system would change the gain of the pulsewidth modulation of the source converter, causing the cut-off frequency and the phase margin of the source converter to change accordingly. Thus, even if a cascaded system is shown to be stable under an impedance-based criterion, it can, in fact, be unstable due to the SRI. This paper proposes an adaptive modulation sample-and-hold method for eliminating the effect of the SRI. A 48 V-12 V-5 V cascaded system consisting of two buck converters is tested for verification.",

keywords = "Adaptive, Cascaded system, Sample-and-hold, stability issue, Switching ripple interaction (SRI)",

author = "Xin Li and Xinbo Ruan and Xiaoling Xiong and Qian Jin and Tse, {Chi K.}",

year = "2019",

month = jul,

doi = "10.1109/TPEL.2018.2876627",

language = "English",

volume = "34",

pages = "7040--7052",

journal = "IEEE Transactions on Power Electronics",

issn = "0885-8993",

publisher = "IEEE",

number = "7",

}

TY - JOUR

T1 - Stability Issue of Cascaded Systems with Consideration of Switching Ripple Interaction

AU - Li, Xin

AU - Ruan, Xinbo

AU - Xiong, Xiaoling

AU - Jin, Qian

AU - Tse, Chi K.

PY - 2019/7

Y1 - 2019/7

N2 - Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that the switching ripple interaction (SRI) between the source converter and the load converter in a cascaded system would change the gain of the pulsewidth modulation of the source converter, causing the cut-off frequency and the phase margin of the source converter to change accordingly. Thus, even if a cascaded system is shown to be stable under an impedance-based criterion, it can, in fact, be unstable due to the SRI. This paper proposes an adaptive modulation sample-and-hold method for eliminating the effect of the SRI. A 48 V-12 V-5 V cascaded system consisting of two buck converters is tested for verification.

AB - Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that the switching ripple interaction (SRI) between the source converter and the load converter in a cascaded system would change the gain of the pulsewidth modulation of the source converter, causing the cut-off frequency and the phase margin of the source converter to change accordingly. Thus, even if a cascaded system is shown to be stable under an impedance-based criterion, it can, in fact, be unstable due to the SRI. This paper proposes an adaptive modulation sample-and-hold method for eliminating the effect of the SRI. A 48 V-12 V-5 V cascaded system consisting of two buck converters is tested for verification.

KW - Adaptive

KW - Cascaded system

KW - Sample-and-hold, stability issue

KW - Switching ripple interaction (SRI)

UR - http://www.scopus.com/inward/record.url?scp=85055039043&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85055039043&origin=recordpage

U2 - 10.1109/TPEL.2018.2876627

DO - 10.1109/TPEL.2018.2876627

M3 - RGC 21 - Publication in refereed journal

SN - 0885-8993

VL - 34

SP - 7040

EP - 7052

JO - IEEE Transactions on Power Electronics

JF - IEEE Transactions on Power Electronics

IS - 7

M1 - 8494812

ER -

Stability Issue of Cascaded Systems with Consideration of Switching Ripple Interaction

Abstract

Research Keywords

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