Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach

Kui Tang; Lin Cheng; Wing Hung Ki

doi:10.1109/ICTA48799.2019.9012813

Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach

Kui Tang, Lin Cheng, Wing Hung Ki

Department of Electronic and Computer Engineering

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

Abstract

In this paper, the circuit-oriented geometrical approach in predicting subharmonic oscillation (SHO) of voltage-mode switching converters has been exteneded to analyze SHO of current-mode buck converters. The critical conditions of the SHO of the current-mode controlled buck converters working in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are systematically derived. It can be observed that SHO always occurs when the duty ratio is larger than 0.5 no matter how the current loop is designed, and can only be avoided by using ramp compenstaion technique. Moreover, the critical conditions in voltage-mode control in fact could be considered as a special case of those in current-mode control, and a unified critical condition for both control methods is derived. Cadence simulation results are presented to verify the analysis.

Original language	English
Title of host publication	2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	37-38
Number of pages	2
ISBN (Electronic)	9781728151670
DOIs	https://doi.org/10.1109/ICTA48799.2019.9012813
Publication status	Published - Nov 2019
Event	2nd IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Chengdu, China Duration: 13 Nov 2019 → 15 Nov 2019

Publication series

Name	2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings

Conference

Conference	2nd IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019
Country/Territory	China
City	Chengdu
Period	13/11/19 → 15/11/19

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

Keywords

buck converter
circuit-oriented geometrical approach
critical condition
current-mode control
perturbation
subharmonic oscillation (SHO)

Access to Document

10.1109/ICTA48799.2019.9012813

Cite this

Tang, K., Cheng, L., & Ki, W. H. (2019). Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach. In 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings (pp. 37-38). Article 9012813 (2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICTA48799.2019.9012813

Tang, Kui ; Cheng, Lin ; Ki, Wing Hung. / Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach. 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2019. pp. 37-38 (2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings).

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title = "Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach",

abstract = "In this paper, the circuit-oriented geometrical approach in predicting subharmonic oscillation (SHO) of voltage-mode switching converters has been exteneded to analyze SHO of current-mode buck converters. The critical conditions of the SHO of the current-mode controlled buck converters working in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are systematically derived. It can be observed that SHO always occurs when the duty ratio is larger than 0.5 no matter how the current loop is designed, and can only be avoided by using ramp compenstaion technique. Moreover, the critical conditions in voltage-mode control in fact could be considered as a special case of those in current-mode control, and a unified critical condition for both control methods is derived. Cadence simulation results are presented to verify the analysis.",

keywords = "buck converter, circuit-oriented geometrical approach, critical condition, current-mode control, perturbation, subharmonic oscillation (SHO)",

author = "Kui Tang and Lin Cheng and Ki, \{Wing Hung\}",

note = "Publisher Copyright: {\textcopyright} 2019 IEEE.; 2nd IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 ; Conference date: 13-11-2019 Through 15-11-2019",

year = "2019",

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language = "English",

series = "2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings",

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Tang, K, Cheng, L & Ki, WH 2019, Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach. in 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings., 9012813, 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc., pp. 37-38, 2nd IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019, Chengdu, China, 13/11/19. https://doi.org/10.1109/ICTA48799.2019.9012813

Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach. / Tang, Kui; Cheng, Lin; Ki, Wing Hung.
2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2019. p. 37-38 9012813 (2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings).

Research output: Chapter in Book/Conference Proceeding/Report › Conference Paper published in a book › peer-review

TY - GEN

T1 - Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach

AU - Tang, Kui

AU - Cheng, Lin

AU - Ki, Wing Hung

PY - 2019/11

Y1 - 2019/11

N2 - In this paper, the circuit-oriented geometrical approach in predicting subharmonic oscillation (SHO) of voltage-mode switching converters has been exteneded to analyze SHO of current-mode buck converters. The critical conditions of the SHO of the current-mode controlled buck converters working in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are systematically derived. It can be observed that SHO always occurs when the duty ratio is larger than 0.5 no matter how the current loop is designed, and can only be avoided by using ramp compenstaion technique. Moreover, the critical conditions in voltage-mode control in fact could be considered as a special case of those in current-mode control, and a unified critical condition for both control methods is derived. Cadence simulation results are presented to verify the analysis.

AB - In this paper, the circuit-oriented geometrical approach in predicting subharmonic oscillation (SHO) of voltage-mode switching converters has been exteneded to analyze SHO of current-mode buck converters. The critical conditions of the SHO of the current-mode controlled buck converters working in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are systematically derived. It can be observed that SHO always occurs when the duty ratio is larger than 0.5 no matter how the current loop is designed, and can only be avoided by using ramp compenstaion technique. Moreover, the critical conditions in voltage-mode control in fact could be considered as a special case of those in current-mode control, and a unified critical condition for both control methods is derived. Cadence simulation results are presented to verify the analysis.

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KW - circuit-oriented geometrical approach

KW - critical condition

KW - current-mode control

KW - perturbation

KW - subharmonic oscillation (SHO)

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T3 - 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings

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BT - 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings

PB - Institute of Electrical and Electronics Engineers Inc.

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ER -

Tang K, Cheng L, Ki WH. Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach. In 2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2019. p. 37-38. 9012813. (2019 IEEE International Conference on Integrated Circuits, Technologies and Applications, ICTA 2019 - Proceedings). doi: 10.1109/ICTA48799.2019.9012813

Analyzing Subharmonic Oscillation of Current-Mode Buck Converters with the Circuit-Oriented Geometrical Approach

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Keywords

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