State-Trajectory Control With Single-Cycle Response for Point-of-Load Converters

A popular variable-frequency control used for point-of-load (POL) converter application is the constant on-time (COT) control. COT control is able to improve light-load efficiency and reduce the amount of output capacitors with high-bandwidth designs, but the transient response of COT control is lim...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2020-04, Vol.67 (4), p.3157-3166
Main Authors: Li, Virginia, Li, Qiang, Lee, Fred C., Liu, Pei-Hsin
Format: Article
Language:English
Subjects:
Buck converters
Capacitors
Constant on-time (COT) control
Converters
Frequency control
point-of-load (POL) converter
single-cycle response
Stability
State-space methods
state-trajectory control
Steady-state
Trajectory
Trajectory control
Transient analysis
transient improvement
Transient response
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Summary:A popular variable-frequency control used for point-of-load (POL) converter application is the constant on-time (COT) control. COT control is able to improve light-load efficiency and reduce the amount of output capacitors with high-bandwidth designs, but the transient response of COT control is limited by the fixed on-time nature of the control. In this paper, a state-trajectory-based control with single-cycle transient response is proposed for POL converters. With the proposed control, the converter will follow the natural state trajectory of the converter for the duration of the detected load step-up transient, which can ensure a very fast transient response. Experimental results are presented to not only demonstrate the proposed idea but also the control's ability to further reduce the amount of output capacitors and save board footprint.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2019.2913820