Limit-cycle stable control of current-mode dc-dc converter with zero-perturbation dynamical compensation

Summary Regarding the non‐limit‐cycle instabilities, which commonly exist in the feedback‐controlled switching power converters, a new zero‐perturbation dynamical compensation method is proposed based on a simplified self‐stable dynamical compensation condition in this paper. With a current‐mode Buc...

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Bibliographic Details
Published in:International journal of circuit theory and applications 2015-03, Vol.43 (3), p.318-328
Main Authors: Lu, Wei guo, Lang, Shuang, Li, Anxin, Iu, Herbert Ho-Ching
Format: Article
Language:English
Subjects:
Analog circuits
Buck converter
Compensation
Converters
dynamical compensation
Dynamical systems
Eigenvalues
Jacobian matrix
limit-cycle stable control
Mathematical analysis
peak current-mode
Slopes
Switching
Systems stability
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Summary:Summary Regarding the non‐limit‐cycle instabilities, which commonly exist in the feedback‐controlled switching power converters, a new zero‐perturbation dynamical compensation method is proposed based on a simplified self‐stable dynamical compensation condition in this paper. With a current‐mode Buck converter as the subject of investigation, the corresponding self‐stable perturbation control equation is given. At the same time, the system stability boundary is obtained based on the investigation of the system eigenvalues, and hence, the working range of control parameters is determined. Finally, the presented simulation and experiment results reveal that the new zero‐perturbation dynamical compensation controller is easily realized with an analog circuit and it will not sacrifice the working range of the original reference current compared with the traditional slope compensation. Copyright © 2013 John Wiley & Sons, Ltd. This paper proposes a zero‐perturbation dynamical compensation scheme to stabilize the current‐mode dc‐dc converter in a limit‐cycle state, which is based on a simplified self‐stable condition (control output approaches zero at the switching instant). And, the proposed zero‐perturbation dynamical compensation is easily realized with an analog circuit and will not sacrifice the working range of the reference current compared with the traditional slope compensation.
ISSN:0098-9886
1097-007X
DOI:10.1002/cta.1942