Four-Frequency Small-Signal Model for High-Bandwidth Voltage Regulator With Current-Mode Control

Sheng-Fu Hsiao; Chin-Fu Nien; Dan Chen; Ching-Jan Chen

doi:10.1109/ACCESS.2022.3154010

IEEE Access (Jan 2022)

Four-Frequency Small-Signal Model for High-Bandwidth Voltage Regulator With Current-Mode Control

Sheng-Fu Hsiao,
Chin-Fu Nien,
Dan Chen,
Ching-Jan Chen

Affiliations

Sheng-Fu Hsiao: Silergy Corporation, Kaohsiung, Taiwan
Chin-Fu Nien: ORCiD; Department of Computer Science and Information Engineering, Chang Gung University, Taoyuan, Taiwan
Dan Chen: Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
Ching-Jan Chen: ORCiD; Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan

DOI: https://doi.org/10.1109/ACCESS.2022.3154010
Journal volume & issue: Vol. 10
pp. 25633 – 25644

Abstract

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High-bandwidth buck voltage regulator with peak current-mode control is a commonly-used scheme, especially for CPU power applications. However, the conventional single-frequency and three-frequency models are inaccurate in modeling the loop gain stability when the control bandwidth is close or higher than one-third of the converter switching frequency. A more accurate four-frequency small-signal model for a high-bandwidth buck converter with peak current-mode control is proposed in the present paper. The describing function approach is used to model the duty-cycle modulator. The effects of the four-frequency components, including the modulating frequency, the two sideband harmonics, and the switching frequency, are considered. Simulations and experiments verified the results.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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